System and method for target doppler estimation and range bias compensation using high duty cycle linear frequency modulated signals

摘要

A method involves using an echo-ranging system to transmit a continuously repeating linear frequency modulated (LFM) signal through a propagation medium and receive a return signal reflected off of a target, performing signal processing on the return signal for processing intervals shorter in duration than the return signal waveform cycle, extracting detected echo sets from the processing intervals, estimating a time versus delay slope for each of the detected echo sets, estimating a target range-rate using the estimated time versus delay slopes, computing a bias error using the estimated target range-rate, applying timing correction to the detected echo sets to remove the bias error, and using the echo ranging system to transmit the detected echo set to a target tracker system.

主权项

1. A method comprising the steps of:
using an echo-ranging system, transmitting a continuously repeating linear frequency modulated (LFM) signal through a propagation medium and receiving a return signal comprising the transmitted LFM signal reflected off of a target in the propagation medium; selecting a processing interval that is shorter than a return signal waveform cycle and perform signal processing on the return signal for each of the processing intervals; extracting detected echo sets from the processing intervals within each return signal waveform cycle; estimating a time versus delay slope for each of the detected echo sets; estimating a target range-rate using the estimated time versus delay slope for each of the detected echo sets; computing a bias error using the estimated target range-rate; and applying timing correction to the detected echo sets to remove the bias error.