Double base distance positioning method for multi-radiating and multi-receiving external radiation source radar under clock deviation

Abstract

The present invention discloses a double base distance positioning method for the multi-radiating and multi-receiving external radiation source radar under clock deviation. The method comprises: performing linear processing according to the double base distance measurement equation of multi-radiating and multi-receiving external radiation source radar under the system deviation and the measurementerror, selecting the distance of the target from the receiving station as an auxiliary variable, and constructing a joint estimation linear model of the target position and the double base distance system deviation; eliminating and ignoring the influence of the correlation between the auxiliary variable and the target position on the target positioning by using a multi-stage weighted least squares algorithm so as to improve the joint estimation accuracy of the target position and the double base distance system deviation; and finally, using the double base distance system deviation to correctthe double base distance measurement value, and performing posterior iteration to further improve the target positioning performance.

Description

technical field [0001] The invention belongs to the field of radar data processing, and in particular relates to a dual-base distance positioning method for multi-transmit and multi-receive external radiation source radar under clock deviation. Background technique [0002] External radiation source radar uses third-party non-cooperative signal sources (such as mobile phone communication signals, TV broadcast signals, and enemy radar information, etc.) to detect targets, and receives signals from target scattering third-party radiation sources through receiving stations (also called observation stations and the direct wave signal, using coherent processing to obtain the time difference of arrival (TDOA) of the signal. The TDOA measurement of external radiation source radar positioning system under the system of multiple sources and multiple receivers can be transformed into dual base range (BR) under the combination of multiple radiation sources and receivers, and the positi...

AI Technical Summary

Problems solved by technology

[0004] The above estimation methods all assume that the obtained BR measurements are unbiased

However, in the actual external radiation source radar system, since the external radiation source (third party) is non-cooperative, the clocks between the external radiation source and the receiving station are not synchronized, so that there is a clock deviation in the measurement information of the external radiation source radar, which makes the BR measurement There is a fixed systematic bias that will affect targeting performance

Images