Navigation system

Claim 1

A NAVIGATION SYSTEM FOR A VEHICLE COMPRISING, FIRST TRANSDUCING MEANS RESPONSIVE TO THE ACCELERATION OF SAID VEHICLE FOR PROVIDING A FIRST SIGNASL REPRESENTATIVE OF THE MOMENT OF SAID VEHICLE THROUGH SPACE, SECOND TRANSDUCING MEANS RESPONSIVE TO RELATIVE VELOCITY BETWEEN SAID VEHICLE AND EARTH FOR PROVIDING A SECOND SIGNAL REPRESENTATIVE OF THE VELOCITY-DERIVED VECTOR VELOCITY OF SAID VEHICLE WITH RESPECT TO EARTH, MEANS RESPONSIVE TO SAID FIRST SIGNAL FOR PROVIDING A THIRD SIGNAL RELATED TO THE INERTIAL-DERIVED VECTOR VELOCITY OF SAID VEHICLE WITH RESPECT TO EARTH, A SOURCE OF A FOURTH SIGNAL REPRESENTATIVE OF THE ANGULAR VELOCITY VECTOR OF EARTH ABOUT ITS POLAR AXIS, MEANS FOR COMBINING SAID SECOND, THIRD AND FOURTH SIGNALS TO DERIVE AND ERROR SIGNAL REPRESENTATIVE OF THE VECTOR DIFFERENCE BETWEEN SAID VELOCITY-DERIVED VECTOR VELOCITY AND SAID INERTIAL-DERIVED VECTOR VELOCITY, MEANS FOR ESTABLISHING FIRST AND SECOND COMPONENTS OF SAID ERROR SIGNAL REPRESENTATIVE OF RESPECTIVE FIRST AND SECOND ORTHOGONAL COMPONENTS OF SAID VECTOR DIFFERENCE, MEANS FOR ESTABLISHING A FIFTH SIGNAL REPRESENTATIVE OF THE ORIENTATION OF THE EARTH POLAR AXIS WHICH FIFTH SIGNAL REPRESENTATION MAY DIFFER FROM THE TRUE ORIENTATION OF SAID POLAR AXIS BY A VECTOR DEVIATION REPRERESENTABLE BY FIRST AND SECOND ORTHOGONAL DEVIATION COMPONENTS RESPECTIVELY PERPENDICULAR TO THE MERIDIONAL PLANE OF THE EARTH INCLUDING SAID VEHICLE AND PERPENDICULAR TO THE POLAR AXIS AND IN SAID MERIDIONAL PLANE, AND MEANS FOR APPLYING SAID FIRST AND SECOND COMPONENTS OF SAID ERROR SIGNAL TO THE LATTER MEANS FOR ESTABLISHING TO REDUCE RESPECTIVE ONES OF SAID FIRST AND SECOND ORTHOGONAL DEVIATION COMPONENTS, SAID MEANS FOR ESTABLISHING SAID FIFTH SIGNAL COMPRISING, A LATITUDE GYRO WHOSE INPUT AXIS IS NORMALLY PARALLEL TO THE EAST-WEST LINE OF DIRECTION THROUGH SAID VEHICLE, AN EQUATORIAL GYRO WHOSE INPUT AXIS IS NORMALLY PERPENDICULAR TO SAID POLAR AXIS AND SAID EAST-WEST LINE OF DIRECTION, MEANS RESPONSIVE TO SAID FIRST COMPONENT OF SAID ERROR SIGNAL FOR MAINTAINING THE INPUT AXIS OF SAID LATITUDE GYRO SUBSTANTIALLY PARALLEL TO SAID EAST-WEST LINE OF DIRECTION, AND MEANS RESPONSIVE TO SAID SECOND COMPONENTS OF SAID ERROR SIGNAL FOR MAINTAINING THE INPUT AXIS OF SAID EQUATORIAL GYRO SUBSTANTIALLY PERPENDICULAR TO SAID POLAR AXIS AND SAID EAST-WEST LINE OF DIRECTION.