A multi-point passive detection all-phase signal sorting and time difference of arrival measurement system

Abstract

The invention relates to a multipoint passive detection all-phase signal sorting and arrival time difference measurement system, and the system comprises a digitalized channel module which is used for receiving and detecting a target signal, and converting the target signal into an intermediate frequency signal for signal processing; an envelope detection and TOA measurement module which is used for extracting the arrival time of the signal and the pulse width of the signal; an all-phase phase and frequency measurement module which is used for measuring the frequency of the target signal and the initial phase of the target signal; a PDW word generation module which is used for generating a PDW word of the target signal; a signal sorting and matching module which outputs a sorting result of the target signal; and a time difference precise measurement module which is used for the complete cycle removal fuzzy processing of the initial phase of a measured signal through the difference between the arrival time of the signals measured by all substations, and takes a phase difference after processing as a precise time difference measurement result. The system can achieve the precise measurement of the frequency and phase of the target signal, and improves the signal sorting efficiency and the time difference measurement precision.

Description

technical field [0001] The invention relates to a multi-point passive detection all-phase signal sorting and arrival time difference measurement system, which is suitable for signal sorting, pairing and precise time difference measurement of the multi-point passive detection system. Background technique [0002] The multi-point passive detection system realizes the determination of the target position through multi-station reception and time difference measurement of the signal emitted by the non-cooperative target, mainly for the radar signal and the identification friend or foe signal emitted by the target. [0003] At present, when the multi-point passive detection system is working, each substation processes the target signal through the Fast Fourier Transform (FFT) algorithm, and measures the signal frequency RF (Radio frequency), arrival time TOA (Time of arrival), pulse Width PW (pulse width), pulse amplitude PA (Pulse amplitude), pulse repetition interval PRI (Pulse ...

AI Technical Summary

Problems solved by technology

[0004] In the current multi-point passive detection system, there are two main problems in using the fast Fourier transform for spectrum analysis: First, the measured phase is only accurate when the signal sampling frequency is an integer multiple of the FFT frequency resolution , otherwise it needs to be corrected by means of correction measures. For a multi-point passive detection system that detects non-cooperative target signals, it is difficult to pre-select the sampling frequency and FFT frequency resolution suitable for phase measurement, and it is impossible to measure and reach each substation. Accurate initial phase of non-cooperative signals, so that the phase difference of the same signal arriving at each substation cannot be used for time difference measurement

Second, there is a serious spectrum leakage effect, which affects the measurement accuracy of frequency and phase

[0005] Based on the above problems, the existing multi-point passive detection system does not make reasonable use of the phase value of the target signal as a characteristic parameter, and the frequency measurement accuracy is not high

Images