US4667203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for determining position using signals from satellites
Assignee: AERO SERVICE DIVISION OF WESTERN GEOPHYSICAL COMPANY A DE CORP
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Filing: 1982-03-01
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Granted: 1987-05-19
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Expires: 2002-03-01
Abstract
Abstract A method and a system are disclosed for measuring the baseline vector b between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting satellites of the NAVSTAR Global Positioning System (GPS), the radio signals broadcast by the satellites being double-sideband modulated with their carriers suppressed. An antenna is positioned at each survey mark. The signals received by one antenna during a predetermined time span are separated into upper and lower sideband components. These separate components are filtered, converted to digital form, and then multiplied together. Their product is analyzed digitally by means of correlation with quadrature outputs of a local oscillator to determine the power, and the phase relative to that local oscillator, of the carrier wave that is implicit in the double-sideband signal being received from each satellite. Differences in Doppler shift are utilized to distinguish the carriers of different satellites. The signals received at the same time by the other antenna are processed in the same manner. Thus, the powers and carrier phases of the signals from a plurality of satellites are measured simultaneously and numerical data representing the measurement results are obtained at each survey mark. The measurements are performed in real time at each mark without reference to signals that are received at any other place and without knowledge of any of the coded signals that modulate the GPS carriers. The data from the measurements performed simultaneously but independently at the two survey marks.
Inventors
- 👤 Charles C. Counselman, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:04
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/03; G01S19/04; G01C; G01C15/00; G01S19/38; G01S19/39; G01S19/42; G01S19/43; G01S19/44
Claims Analysis
Total Claims: 89
Claim 1
Independent Claim
81 words
A method for determining position using carrier suppressed radio signals broadcast from a plurality of earth orbiting satellites, said method comprising: a. positioning an upward looking omni-directional antenna at a survey mark; b. measuring the carrier phases implicit in the signals concurrently received from a plurality of the satellites independently of externally derived knowledge of the information content of the modulation thereof by cross-correlating spectral portions of such concurrently received signals, and then c. processing the measurements to determine position information.
Claim 2
Independent Claim
81 words
A method for determining position using carrier suppressed radio signals broadcast from a plurality of earth orbiting satellites, said method comprising: a. positioning an upward looking omni-directional antenna at a survey mark; b. measuring the carrier phases implicit in the signals concurrently received from a plurality of the satellites independently of externally derived knowledge of the information content of the modulation thereof by cross-correlating spectral portions of such concurrently received signals, and then c. processing the measurements to determine position information.
Claim 3
Dependent Claim
63 words
The method of claim 1 wherein the measuring step comprises: a. separating said concurrently received signals into upper and lower sideband components; b. filtering said separated components to remove spurious signals: c. multiplying said separated and filtered components together; and then d. analyzing the product of said multiplication to determine the phase of a carrier wave implicit in the signals from each satellite.
Claim 4
Independent Claim
141 words
A system for use in measuring position using radio signals broadcast from a plurality of earth orbiting satellites, and including a terminal adapted to be positioned at a point on earth, comprising: a. an upward looking omni-directional antenna assembly for concurrently receiving radio signals from a plurality of satellites, said antenna assembly including an antenna, and b. an electronic assembly for converting received carrier-suppressed signals into carrier phase data, said electronics assembly including: i. a receiver unit for receiving signals from the antenna assembly and outputting signals, representing the upper sideband component of the received signals, the lower sideband of the received signals, and the output of a reference oscillator; ii. a digital electronics unit for converting the output signals from the receiver unit into carrier phase data, and iii. a computer for processing said carrier phase data to determine position.
Claim 5
Independent Claim
141 words
A system for use in measuring position using radio signals broadcast from a plurality of earth orbiting satellites, and including a terminal adapted to be positioned at a point on earth, comprising: a. an upward looking omni-directional antenna assembly for concurrently receiving radio signals from a plurality of satellites, said antenna assembly including an antenna, and b. an electronic assembly for converting received carrier-suppressed signals into carrier phase data, said electronics assembly including: i. a receiver unit for receiving signals from the antenna assembly and outputting signals, representing the upper sideband component of the received signals, the lower sideband of the received signals, and the output of a reference oscillator; ii. a digital electronics unit for converting the output signals from the receiver unit into carrier phase data, and iii. a computer for processing said carrier phase data to determine position.
Claim 6
Dependent Claim
29 words
The system of claim 3 and wherein said receiver unit includes an upper and lower sideband separator for separating the received signals into their upper and lower sideband components.
Claim 7
Dependent Claim
22 words
The system of claim 4 and wherein said digital electronics unit includes a plurality of correlators and a plurality of numerical oscillators.
Claim 8
Independent Claim
86 words
A method for determining position comprising the steps of: (a) receiving a composite of modulated, carrier-suppressed signals from a plurality of satellites at a first mark with an upward looking omni-directional antenna; (b) generating a first set of data representative of carrier phases implicit in said signals independently of externally derived knowIedge of the information content of the modulation thereof; (c) generating a second set of data related to a second mark: (d) processing said sets of data to determine the relative position of the marks.
Claim 9
Independent Claim
86 words
A method for determining position comprising the steps of: (a) receiving a composite of modulated, carrier-suppressed signals from a plurality of satellites at a first mark with an upward looking omni-directional antenna; (b) generating a first set of data representative of carrier phases implicit in said signals independently of externally derived knowIedge of the information content of the modulation thereof; (c) generating a second set of data related to a second mark: (d) processing said sets of data to determine the relative position of the marks.
Claim 10
Dependent Claim
42 words
The method of claim 6 wherein the step of generating the first set of data includes the steps of: a. separating said composite into first and second components; and b. correlating said components to generate data related to the implicit carrier phases.
Claim 11
Dependent Claim
42 words
The method of claim 7 including the step of distinguishing the contribution of the modulated carrier-suppressed signal received from a particular satellite from the contributions of the other concurrently received signals by using the Doppler shift of said modulated carrier suppressed signal.
Claim 12
Dependent Claim
15 words
The method of claim 7 wherein the first and second components are different spectral components.
Claim 13
Dependent Claim
15 words
The method of claim 9 wherein the spectral components are sidebands of the suppressed carrier.
Claim 14
Dependent Claim
15 words
The method of claim 6 wherein the signals received in step (a) are received concurrently.
Claim 15
Dependent Claim
36 words
The method of claim 6 including the step of distinguishing the modulated carrier-suppressed signal received from a particular satellite from the other concurrently received signals by using the Doppler shift of said modulated carrier suppressed signal.
Claim 16
Independent Claim
96 words
The method of determining position information from carrier suppressed signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising: (a) collecting at a first mark a first composite signal simultaneously including components representing carrier suppressed signals received by an upward looking omni-directional antenna, from more than one of the satellites: (b) deriving therefrom data related to a selected carrier implicit in the signals received from a selected satellite, independently of externally derived knowledge of the information content of the modulation of that selected carrier; and (c) processing the data to determine position information.
Claim 17
Independent Claim
96 words
The method of determining position information from carrier suppressed signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising: (a) collecting at a first mark a first composite signal simultaneously including components representing carrier suppressed signals received by an upward looking omni-directional antenna, from more than one of the satellites: (b) deriving therefrom data related to a selected carrier implicit in the signals received from a selected satellite, independently of externally derived knowledge of the information content of the modulation of that selected carrier; and (c) processing the data to determine position information.
Claim 18
Dependent Claim
24 words
The method of claim 13 wherein additional data are derived related to a second selected carrier implicit in the signals transmitted by the satellites.
Claim 19
Dependent Claim
36 words
The method of claim 14 wherein the first composite signal collecting step (a), further comprises: (d) positioning an upward looking omni-directional antenna at the first mark to receive concurrently the signals from the plurality of satellites.
Claim 20
Dependent Claim
37 words
The method of claim 14, further comprising: (e) deriving at a second mark data related to the signals concurrently transmitted by the plurality of satellites; and (f) processing the data from both marks to determine relative position.
Claim 21
Dependent Claim
38 words
The methods of claims 14 or 16 wherein the data deriving step (b), further comprises: (g) generating a reconstructed signal including a component whose frequency and phase are related to the frequency and phase of the selected carrier.
Claim 22
Dependent Claim
50 words
The method of claim 17 wherein the reconstructed signal generating step (g), further comprises: (h) separating the first composite signal into first and second spectral components representing substantially different portions of the spectrum of the first composite signal; and (i) combining the separated spectral components to form the reconstructed signal.
Claim 23
Dependent Claim
28 words
The method of claim 18 wherein the spectral component separation step (h) separates the signals received from the satellites into upper and lower sidebands of the selected carrier.
Claim 24
Dependent Claim
57 words
The method of claim 18 wherein the reconstructed signal generating step (g), further comprises: (j) generating a first binary signal representing the time varying sign of the first spectral component: (k) generating a second binary signal representing the time varying sign of the second spectral component; and (l) combining the binary signals to form the reconstructed signal.
Claim 25
Dependent Claim
40 words
The method of claim 17 wherein the data deriving step (b), further comprises: (m) generating an estimate of the frequency of the selected carrier component; and (n) combining the estimate with the reconstructed signal to separate the selected carrier component.
Claim 26
Dependent Claim
26 words
The method of claim 21 wherein the data deriving step (b), further comprises: (o) varying the estimate to track the frequency of the selected carrier component.
Claim 27
Dependent Claim
54 words
The method of claim 17 wherein the data deriving step (b), further comprises: (p) generating a predicted signal based on a prediction, made before the first composite signal is collected, of the Doppler shift of the selected carrier; and (q) combining the predicted signal with the reconstructed signal to separate the selected carrier component.
Claim 28
Dependent Claim
30 words
The method of claim 23 wherein the data deriving step (b), further comprises: (r) varying the frequency of the predicted signal to maximize the separation of the selected carrier component.
Claim 29
Dependent Claim
50 words
The methods of claims 14 or 16 wherein the data deriving step (b), further comprises: (s) generating a second composite signal including a plurality of reconstructed components having discrete frequencies and phases related to the frequencies and phases of carriers implicit in the signals received from each of the satellites.
Claim 30
Dependent Claim
54 words
The method of claim 25 wherein the second composite signal generating step (s), further comprises: (t) separating the first composite signal into first and second spectral components representing substantially different portions of the spectrum of the first composite signal: and (u) combining the first and second spectral components to form the second composite signal.
Claim 31
Dependent Claim
37 words
The method of claim 26 wherein the selected carrier is a center frequency carrier and the spectral component separation step (t) separates the first composite signal into upper and lower sidebands of the selected center frequency carrier.
Claim 32
Dependent Claim
62 words
The method of claim 26 wherein the second composite signal generating step (s), further comprises: (v) generating a first binary signal representing the time varying sign of the first spectral component; (w) generating a second binary signal representing the time varying sign of the second spectral component: and (x) combining the first and second binary signals to form the second composite signal.
Claim 33
Dependent Claim
46 words
The method of claim 25 wherein the data deriving step (b), further comprises: (y) generating an estimate of the frequency of the selected carrier as received; and (z) combining the estimate with the second composite signal to separate the reconstructed component related to the selected carrier.
Claim 34
Dependent Claim
52 words
The method of claim 25 wherein the data deriving step (b), further comprises: (aa) generating a series of estimates of the frequencies of selected carriers implicit in the signals received from the satellites; and (ab) combining each of the series of estimates with the second composite signal to separate the reconstructed components.
Claim 35
Dependent Claim
28 words
The method of claim 30 wherein the estimate generating generating step (aa), further comprises: (ac) varying the series of estimates to track the frequencies of the selected carriers.
Claim 36
Dependent Claim
59 words
The method of claim 25 wherein the data deriving step (b), further comprises: (ad) generating a predicted signal based on a prediction, made before the first composite signal is collected, of the Doppler shift of the selected carrier; and (ae) combining the predicted signal with the second composite signal to separate a reconstructed component related to the selected carrier.
Claim 37
Dependent Claim
66 words
The method of claim 25 wherein the data deriving step (b), further comprises: (af) generating a series of predicted signals based on predictions, made before the first composite signal is collected, of the Doppler shifts of selected carriers implicit in the signals received from the satellites; and (ag) combining each of the series of predicted signals with the second composite signal to separate the reconstructed components.
Claim 38
Dependent Claim
32 words
The method of claim 33 wherein the predicted signal generating step (af), further comprises: (ah) varying the frequencies of the series of predicted signals to maximize the separation of the reconstructed components.
Claim 39
Independent Claim
106 words
A system for determining position information from carrier suppressed signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising: (a) means for collecting at a first mark a first composite signal simultaneously including components representing carrier suppressed signals received from more than one of the satellites with an upward looking omni-directional antenna; (b) means for deriving, from the first composite signal, data related to a selected carrier implicit in the signals transmitted by a selected satellite, independently of externally derived knowledge of the information content of the modulation of that selected carrier: and (c) means for processing the data to determine position information.
Claim 40
Independent Claim
106 words
A system for determining position information from carrier suppressed signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising: (a) means for collecting at a first mark a first composite signal simultaneously including components representing carrier suppressed signals received from more than one of the satellites with an upward looking omni-directional antenna; (b) means for deriving, from the first composite signal, data related to a selected carrier implicit in the signals transmitted by a selected satellite, independently of externally derived knowledge of the information content of the modulation of that selected carrier: and (c) means for processing the data to determine position information.
Claim 41
Dependent Claim
24 words
The system of claim 35 wherein additional data are derived related to a second selected carrier implicit in the signals transmitted by the satellites.
Claim 42
Dependent Claim
34 words
The system of claim 36 wherein the signal collecting means (a), further comprises: (d) upward looking omni-directional antenna means positioned at the first mark for concurrently receiving the signals from the plurality of satellites.
Claim 43
Dependent Claim
39 words
The system of claim 36 further comprising: (e) means for deriving data at a second mark related to the signals concurrently transmitted by the satellites; and (f) means for processing the data from both marks to determine relative position.
Claim 44
Dependent Claim
40 words
The systems of claims 36 or 38 wherein the data deriving means (b), further comprises: (g) means for generating a reconstructed signal including a component whose frequency and phase are related to the frequency and phase of the selected carrier.
Claim 45
Dependent Claim
53 words
The system of claim 39 wherein the reconstructed signal means (g), further comprises: (h) means for separating the first composite signal into first and second spectral components representing substantially different portions of the spectrum of the first composite signal; and (i) means for combining the separated spectral components to form the reconstructed signal.
Claim 46
Dependent Claim
43 words
The system of claim 40 wherein the selected carrier is a center frequency carrier and the signal separating means (h), further comprises: (j) means for separating the signals received from the satellites into upper and lower sidebands of the selected center frequency carrier.
Claim 47
Dependent Claim
62 words
The system of claim 40 wherein the reconstructed signal means (g), further comprises: (k) means for generating a first binary signal representing the time varying sign of the first spectral component; (l) means for generating a second binary signal representing the time varying sign of the second spectral component; and (m) means for combining the binary signals to form the reconstructed signal.
Claim 48
Dependent Claim
46 words
The system of claim 39 wherein the data deriving means (b), further comprises: (n) means for generating an estimate of the frequency of the selected carrier component as received; and (o) means for combining the estimate with the reconstructed signal to separate the selected carrier component.
Claim 49
Dependent Claim
28 words
The system of claim 43 wherein the data deriving means (b), further comprises: (p) means for varying the estimate to track the frequency of the selected carrier component.
Claim 50
Dependent Claim
61 words
The system of claim 39 wherein the data deriving means (b), further comprises: (q) means for generating a predicted signal based on a prediction, made before the first composite signal is collected, of the Doppler shift of the signals from the selected satellite; and (r) means for combining the predicted signal with the reconstructed signal to separate the selected carrier component.
Claim 51
Dependent Claim
32 words
The system of claim 45 wherein the data deriving means (b), further comprises: (s) means for maximizing the separation of the selected carrier component by varying the frequency of the predicted signal.
Claim 52
Dependent Claim
52 words
The systems of claims 36 or 38 wherein the data deriving means (b), further comprises: (t) means for generating a second composite signal including a plurality of reconstructed components having discrete frequencies and phases related to the frequencies and phases ot carriers implicit in the signals received from each of the satellites.
Claim 53
Dependent Claim
58 words
The system of claim 47 wherein the second composite signal generating means (t), further comprises: (u) means for separating the first composite signal into first and second spectral components representing substantially different portions of the spectrum of the first composite signal; and (v) means for combining the first and second spectral components to form the second composite signal.
Claim 54
Dependent Claim
40 words
The system of claim 48 wherein the selected carrier is a center frequency carrier and the signal separating means (u), comprises: (w) means for separating the first composite signal into upper and lower sidebands of the selected center frequency carrier.
Claim 55
Dependent Claim
68 words
The system of claim 48 wherein the second composite signal generating means (t), further comprises: (x) means for generating a first binary signal representing the time varying sign of the first spectral component; (y) means for generating a second binary signal representing the time varying sign of the second spectral component; and (z) means for combining the first and second binary signals to form the second composite signal.
Claim 56
Dependent Claim
54 words
The system of claim 47 wherein the data deriving means (b), further comprises: (aa) means for generating a series of estimates of the frequencies of selected carriers implicit in the signals received from the satellites; and (ab) means for combining each of the series with the second composite signal to separate the reconstructed components.
Claim 57
Dependent Claim
27 words
The system of claim 51 wherein the estimate generating means (aa), further comprises: (ac) means for varying the estimates to track the frequencies of the selected carriers.
Claim 58
Dependent Claim
70 words
The system of claim 47 wherein the data deriving means (b), further comprises: (ad) means for generating a series of predicted signals based on predictions, made before the first composite signal is collected, of the Doppler shifts of selected carriers implicit in the signals received from the satellites; and (ae) means for combining each of the series of predicted signals with the second composite signal to separate the reconstructed components.
Claim 59
Dependent Claim
32 words
The system of claim 53 wherein the predicted signal generating means (ad), further comprises: (af) means for maximizing the separation of the reconstructed components by varying the frequencies of the predicted signals.
Claim 60
Independent Claim
111 words
The method of determining position information from wide spectrum signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising; (a) collecting at a first mark a first composite signal simultaneously including components representing signals having substantially overlapping wide spectra received from more than one of the satellites; (aa) reconstructing the first composite to form a second composite simultaneously including a plurality of reconstructed components; (b) using the frequency of a selected suppressed signal implicit in the signals received from a selected satellite to separate the component related to that satellite from other components of the second composite signal; and (c) processing the separated component to determine position information.
Claim 61
Independent Claim
111 words
The method of determining position information from wide spectrum signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising; (a) collecting at a first mark a first composite signal simultaneously including components representing signals having substantially overlapping wide spectra received from more than one of the satellites; (aa) reconstructing the first composite to form a second composite simultaneously including a plurality of reconstructed components; (b) using the frequency of a selected suppressed signal implicit in the signals received from a selected satellite to separate the component related to that satellite from other components of the second composite signal; and (c) processing the separated component to determine position information.
Claim 62
Dependent Claim
40 words
The method of claim 55 wherein the component separation step (b), further comprises: (d) using the frequencies of selected suppressed signals implicit in the signals from each of the satellites to separate reconstructed components related to each of the satellites.
Claim 63
Dependent Claim
20 words
The method of claim 55 wherein the frequency used is based upon the Doppler shift of the signals as received.
Claim 64
Dependent Claim
41 words
The method of claim 57 wherein the information determined is phase data related to a selected suppressed signal and such phase data is determined independently of externally derived knowledge of the information content of the modulation of that selected suppressed signal.
Claim 65
Dependent Claim
33 words
The method of claim 55 wherein the signal collecting step (a), comprises: (e) positioning an upward looking omni-directional antenna at the first mark to receive concurrently the signals from the plurality of satellites.
Claim 66
Dependent Claim
21 words
The method of claim 55, further comprising: (f) separating components representing signals received from the satellites at a second mark: and
Claim 67
Dependent Claim
13 words
(g) processing the components so separated from both marks to determine relative position.
Claim 68
Dependent Claim
13 words
(g) processing the components so separated from both marks to determine relative position.
Claim 69
Dependent Claim
29 words
The methods of claims 56 or 60 further comprising: (h) generating a reconstructed component related in frequency to a suppressed signal implicit in the signals received from the satellite.
Claim 70
Dependent Claim
40 words
The method of claim 61 wherein the component separation step (b), further comprises: (i) generating an estimate of the frequency of the selected suppressed signal; and (j) combining the estimate with the second composite to separate the related reconstructed component.
Claim 71
Dependent Claim
26 words
The method of claim 62 wherein the estimate generating step (i), further comprises: (k) varying the estimate to track the frequency of the selected suppressed signal.
Claim 72
Dependent Claim
56 words
The method of claim 61 wherein the component separation step (b), further comprises: (l) generating a predicted signal based on a prediction, made before the first composite signal is collected, of the Doppler shift of the selected suppressed signal; and (m) combining the predicted signal with the second composite to separate the related reconstructed signal component.
Claim 73
Dependent Claim
32 words
The method of claim 64 wherein the predicted and second composite combining step (m) further comprises: (n) varying the frequency of the predicted signal to maximize the separation of the related component.
Claim 74
Dependent Claim
44 words
The methods of claims 56 or 60 wherein the reconstruction step (aa) further comprises: (o) generating a second composite signal including a plurality of reconstructed components with discrete frequencies related in frequency to the suppressed signals implicit in the signals received from the satellites.
Claim 75
Dependent Claim
41 words
The method of claim 66 wherein the component separation step (b), further comprises: (p) generating a series of estimates of the frequencies of selected suppressed signals; and (q) combining the estimates with the second composite signal to separate the reconstructed components.
Claim 76
Dependent Claim
55 words
The method of claim 66 wherein the component separation step (b), further comprises: (r) generating a series of predicted signals based on predictions, made before the first composite signal is collected, of the Doppler shifts of selected suppressed signals; and (s) combining the predicted signals with the second composite signal to separate the reconstructed components.
Claim 77
Independent Claim
125 words
A system for determining position information from wide spectrum signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising: (a) means for collecting at a first mark a first composite signal simultaneously including components representing signals having substantially overlapping wide spectra received from more than one of the satellites; (aa) means for reconstructing the first composite to form a second composite simultaneously including a plurality of reconstructed components; (b) means responsive to the first composite signal for separating the component related to a selected satellite from other components of the first composite signal by use of the frequency of a selected suppressed signal implicit in the signals from that satellite; (c) means for processing the component so separated to determine position information.
Claim 78
Independent Claim
125 words
A system for determining position information from wide spectrum signals transmitted concurrently with the same frequencies by a plurality of satellites, comprising: (a) means for collecting at a first mark a first composite signal simultaneously including components representing signals having substantially overlapping wide spectra received from more than one of the satellites; (aa) means for reconstructing the first composite to form a second composite simultaneously including a plurality of reconstructed components; (b) means responsive to the first composite signal for separating the component related to a selected satellite from other components of the first composite signal by use of the frequency of a selected suppressed signal implicit in the signals from that satellite; (c) means for processing the component so separated to determine position information.
Claim 79
Dependent Claim
38 words
The system of claim 69 wherein the component separation means (b), further comprises: (d) means for separating reconstructed components related to each of the satellites by use of the frequencies of suppressed signals implicit in the signals therefrom.
Claim 80
Dependent Claim
20 words
The system of claim 69 wherein the frequency used is based upon the Doppler shift of the signals as received.
Claim 81
Dependent Claim
38 words
The system of claim 71 wherein the information determined is phase data related to a selected suppressed signal and is determined independently of externally derived knowledge of the information content of the modulation of that selected suppressed signal.
Claim 82
Dependent Claim
34 words
The system of claim 69 wherein the signal collecting means (a), further comprises: (e) upward looking omni-directional antenna means positioned at the first mark to receive concurrently the signals from a plurality of satellites.
Claim 83
Dependent Claim
38 words
The system of claim 69, further comprising: (f) means for separating components representing signals collected from the satellites at a second mark; and (g) means for processing the components so separated from both marks to determine relative position.
Claim 84
Independent Claim
32 words
The system of claims 70 or 74 further comprising: (h) means for generating a reconstructed component related in frequency to a suppressed signal implicit in the signals received from the selected satellite.
Claim 85
Dependent Claim
45 words
The system of claim 75 wherein the component separation means (b), further comprises: (i) means for generating an estimate of the frequency of the selected suppressed signal; and (j) means for combining the estimate with the second composite to separate the related reconstructed signal component.
Claim 86
Dependent Claim
28 words
The system of claim 76 wherein the estimate generating means (i), further comprises: (k) means for varying the estimate to track the frequency of the selected suppressed signal.
Claim 87
Dependent Claim
46 words
The systems of claims 70 or 74 wherein the reconstructing means (aa) further comprises: (l) means for generating a second composite signal including a plurality of reconstructed components with discrete frequencies related in frequency to the suppressed signals implicit in the signals received from the satellites.
Claim 88
Dependent Claim
47 words
The system of claim 78 wherein the component separation means (b), further comprises: (m) means for generating a series of estimates of the frequencies of selected suppressed signals; and (n) means for combining the series of estimates with the second composite signal to separate the reconstructed components.
Claim 89
Dependent Claim
59 words
The system of claim 78 wherein the component separation means (b), further comprises: (o) means for generating a series of predicted signals based on prediction, made before the first composite signal is collected, of the Doppler shifts of selected suppressed signals; and (p) means for combining the predicted signals with the second composite signal to separate the reconstructed components.
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| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |