Multi-station passive positioning method based on time difference of arrival of signals

Abstract

The invention discloses a multi-station passive positioning method based on time difference of arrival of signals. The method comprises the following steps: S1, receiving a target radiation source signal each receiving station receives a target radiation source signal; S2, calculating the time difference of arrival of the signals: the time difference of arrival of the signals between every two receiving stations is calculated; S3, calculating the estimated position of the target radiation source: the estimated position of the target radiation source is obtained by adopting a weighted least square method twice; S4, setting a search area: the estimated position of the target radiation source is taken as a center, and a search area is set around the estimated position; S5, searching a target function extreme value: minimum value point searching of the target function is carried out in the searching area; and S6, determining the position of the target radiation source: the coordinate corresponding to the minimum value point of the target function is the position of the target radiation source. The method limits the search area, can improve the positioning efficiency, reduces the number of iterations, and reduces the calculation complexity.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a multi-station passive positioning method based on signal arrival time difference. Background technique [0002] Using the signal receiving station to passively receive electromagnetic radiation signals to determine the position of electromagnetic radiation sources such as radar and communication equipment is called passive positioning technology. Various existing passive positioning systems can be roughly divided into the use of airspace measurement information, frequency domain measurement, Doppler frequency, time of arrival of radiation source signals, and time difference of arrival parameters from the perspective of measurement. Compared with the direction finding positioning system and the positioning system based on frequency domain measurement, the timing positioning system based on signal time difference of arrival not only has high positioning accuracy, but al...

AI Technical Summary

Problems solved by technology

The commonly used solution algorithms have their own advantages and disadvantages: although the iterative method has a small amount of calculation, the estimation accuracy is usually not high; the analytical method has a high noise threshold and is easy to fall into a local optimal solution; although the extremum search method has high accuracy, it requires a large amount of calculation. , and when there are many parameters to be estimated, the solution efficiency will inevitably decrease

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