Multi-emission-source passive locating method based on position and waveform parameter joint estimation

Abstract

The invention provides a multi-emission-source passive locating method based on position and waveform parameter joint estimation, and relates to the field of radar signal processing. According to themethod, locating of multiple emitters for emitting unknown linear frequency modulation signals is considered, and a multistatic radar receiver is adopted to intercept and capture the signals and transmit data to a processing center for locating. The method comprises the steps of firstly, using short-time Fourier transform to obtain a time-frequency spectrum of the received signals, then conductingHough transform on the time-frequency spectrum to separate and extract the time-frequency spectrum, then using a basic sorting algorithm to process the separated time-frequency spectrum, and finally,determining positions and signal parameters of multiple emission sources through the further utilization of grid search. By means of the multi-emission-source passive locating method based on the position and waveform parameter joint estimation, aiming at multiple linear frequency modulation emitters, passive locating is effectively combined with short-time Fourier transform and Hough transform,and the signal parameters and the positions are jointly estimated while the increase of the calculation amount is controlled. The problem that it is difficult for an existing passive locating algorithm to locate multiple objects is effectively solved, and thus high-precision locating of the targets is achieved.

Description

technical field [0001] The invention belongs to the field of radar signal processing, in particular to a multi-radiation source passive positioning method based on joint estimation of position and waveform parameters. Background technique [0002] Passive positioning technology has the advantages of low interception rate and low power consumption compared with active radar because the radar itself does not need a transmitter to emit electromagnetic waves. At present, there are two kinds of passive radars under development: one is to rely on target radiators to detect and locate targets, and the other is to use electromagnetic waves emitted by other radiators to further locate targets. The former case is considered here, in which the target itself is the radiation source, which may be airborne radar, jammer and communication equipment, etc., so it can also be called transmitter positioning. [0003] In the prior art, there is a direct positioning method (DPD) that jointly pr...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor positioning accuracy of existing positioning technology and the inability to locate multiple transmitter targets, the present invention provides a multi-emitting source passive positioning method based on joint estimation of position and waveform parameters, which can realize low signal-to-noise ratio High-precision positioning of multiple emission sources

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