Patent ID: 6172639
Filing Date: 2001-01-09
Classification: G01S

Abstract:
A signal structure embodied in a carrier wave for a position determination system, comprising:a frequency band ranging between, and including, a lower frequency at, near or toward a first lower null point of a high rate code and an upper frequency at, near or toward a first upper null point of said high rate code;a first coded signal located at a frequency proximate to said lower frequency;a second coded signal located at a frequency proximate to said upper frequency;said first and second coded signals providing a wide lane resulting from a wavelength .lambda. corresponding to the frequency difference .DELTA.f between said first and second coded signals, .lambda. being related to .DELTA.f by .lambda.=c/.DELTA.f, c being the speed of light;wherein the high rate code and a phase difference between the first and second coded signals contain information permitting the position determination system to receive the carrier wave and to determine at least one of a position, a time, a speed and an attitude in accordance with the signal structure.