Multi-station and multiple-external-radiation-source radar moving target positioning method under receiving station position error

Abstract

The invention discloses a multi-station and multiple-external-radiation-source radar moving target positioning method under a receiving station position error. The method comprises the steps of, according to an obtained bistatic range and a bistatic range rate, using the distance from a target to the receiving station and a distance change rate as auxiliary variables to pseudo-linearize a strong nonlinear equation; establishing an estimation model of the target position and velocity; integrating statistical characteristics of an observation station position and a velocity measurement error into a positioning algorithm for designing weights; constructing a constraint weighted least squares localization model by using the association between the auxiliary variables and the target position and velocity as a constraint condition; and optimizing and solving the model by a Lagrange multiplier method. The method introduces the auxiliary variables, converts a nonlinear measurement model into pseudo-linear model, reduces the complexity of multi-station and multiple-external-radiation-source positioning under the premise of ensuring the estimation performance, and designs the weighted leastsquares estimation according to the intermediate variable and the association, thereby reducing the influence of the observation station error on the target positioning performance.

Description

technical field [0001] The invention belongs to the field of radar data processing, and in particular relates to a multi-station and multi-external radiation source radar moving target positioning method under the error of a receiving station. 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.) Coherent processing obtains the time delay and Doppler frequency difference of the signal. Using the time delay and Doppler frequency difference can realize the positioning of the moving target. The delay observation directly corresponds to the propagation distance sum of the signal from the external radiation source to the receiving station after being reflected by the target, also known as bistatic range (BR), and the Doppler frequency difference corresponds to the change rate of the bistatic range ( Bistatic Range Rate, BRR...

AI Technical Summary

Problems solved by technology

[0004] The above BR / BRR-based external radiation source positioning problem assumes that the position and velocity of the receiving station are known accurately, but in actual external radiation source radar positioning systems, the observation stations are often installed on moving platforms such as satellites, aircraft, ships, or ground vehicles, although The position of the receiving station can be obtained by the navigation system on the positioning platform, but it still inevitably contains random errors

Neglecting the influence of receiving station errors will lead to a serious degradation in the performance of target location estimation, and even generate false targets

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