A time difference location method for truncated broadband chirp signal

Abstract

The invention relates to a time difference positioning method for truncated broadband chirp signals. The invention can better solve the problem that the wideband chirp signals are difficult to match and locate due to deviations in arrival time difference after the broadband signal is truncated due to channelization. The present invention designs a specific implementation framework mainly based on the main characteristics of the broadband chirp signal and the convergence consistency of the moving target trajectory corresponding to the time difference, and realizes full pulse data preprocessing, target blind positioning (clustering in frequency domain and time domain respectively) and A series of processing such as target association, tracking, filtering, etc. The present invention still has a good positioning effect for the broadband linear frequency modulation signal when it is difficult to completely intercept and the arrival time of the 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 between the arrival of the same radiation source signal to multiple stations to form a hyperbola (surface) for positioning. Long-baseline time difference positioning has been widely used in engineering implementation due to its high positioning accuracy and simple positioning algorithm. However, it has high requirements on the time synchronization between the 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 increasing diversification of radar working systems, the frequency parameters, repetition period parameters, and pulse width parameters of complex radar signals will change. It is difficult for the existing localization mech...

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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