A time difference of arrival (TDOA) positioning method for intercepted broadband linear frequency modulation signals

Abstract

The invention relates to a time difference of arrival (TDOA) positioning method for intercepted broadband linear frequency modulation signals. The method can better solve the problem of broadband linear frequency modulation signals that deviation of time difference of arrival exists after interception of the broadband signals because of channelization and thus matching and positioning are difficult. The time difference of arrival (TDOA) positioning method is characterized in that a concrete implementation frame is designed based on the main characteristics of broadband linear frequency modulation signals and the convergence consistence of corresponding time differences of moving object trajectories, so that a series of processing such as full pulse data preprocessing, target blind positioning (separate clustering of frequency domain and time domain) and target association, tracking and filtering. The method can achieve a better positioning effect even when broadband linear frequency modulation signals cannot be completely intercepted and the time of arrival of full pulse data deviates.

Description

technical field [0001] The technical invention belongs to the field of passive reconnaissance. Background technique [0002] Time-difference positioning is a passive positioning technology that uses the time difference of the same radiation source signal to arrive at multiple stations to form a hyperbola (surface) for positioning. Due to its high positioning accuracy and simple positioning algorithm, long-baseline time-of-flight positioning has been widely used in engineering realization. However, it has higher requirements on the time synchronization between stations and the accuracy of the arrival time of the target radiation source. [0003] In practical applications, due to the increasingly complex electromagnetic environment and the increasingly diverse radar working system, complex radar signal frequency parameters, repetition period parameters, pulse width parameters, etc. will all change. It is difficult for the existing positioning mechanism to cover all types of ...

AI Technical Summary

Problems solved by technology

[0007] The present invention is mainly a time-difference positioning technology for truncated broadband chirp signals, and effectively solves the problem of truncated broadband chirp signals by performing full pulse data preprocessing, target sequence search, frequency domain clustering, time difference clustering, and positioning defuzzification key algorithms for positioning targets The time difference is difficult to match successfully, and the fuzzy solution generated by the positioning process is eliminated by using the convergence consistency of the target trajectory corresponding to the time difference

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