초록 ▼

A system is disclosed for estimating the position and velocity of a moving transmitter making use of both Doppler frequency measurements and LBI phase measurements. The frequency measurements and the LBI phase measurements are made from a platform moving through said measurement path. The estimation

A system is disclosed for estimating the position and velocity of a moving transmitter making use of both Doppler frequency measurements and LBI phase measurements. The frequency measurements and the LBI phase measurements are made from a platform moving through said measurement path. The estimation is based on equation models ]EQU1 ] These equation models are used in cost evaluations in grid searches to provide initial estimates of parameters defining the position and velocity of the transmitter and the initial estimates are used in nonlinear least squares calculations based on the equation models to provide an estimate of the position and velocity of the transmitter.

대표청구항 ▼

[ I claim:] [1.] A method of estimating the position and heading of a transmitter, comprising moving a platform having an LBI signal sensor through a measurement path, detecting the frequency sensed by an antenna on said platform at measurement points distributed along said measurement path, detecti

[ I claim:] [1.] A method of estimating the position and heading of a transmitter, comprising moving a platform having an LBI signal sensor through a measurement path, detecting the frequency sensed by an antenna on said platform at measurement points distributed along said measurement path, detecting the LBI phase differences detected by said LBI sensor at measurement points distributed along said measurement path, and estimating the position and heading of said transmitter from the frequency and LBI phase measurements in accordance with equation models: ]EQU19 ] in which f is the frequency received by an antenna on said platform, f.sub.o is the frequency of the signal transmitted by said transmitter, c is the transmission velocity of the signal in the medium between said transmitter and said platform, .DELTA.V is the vector difference between the velocities of said transmitter and said platform, r is the range vector, .phi. is the LBI phase difference measurements, .phi..sub.o is the LBI sensor phase offset, L is the length of the base line of the LBI sensor, .lambda. is the wavelength of the transmitted signal, .theta..sub..phi. is the angle of arrival of the transmitted signal to the LBI base line.