Frequency hopping signal time difference estimation method

Abstract

A frequency hopping signal time difference estimating method belongs to the signal processing category. With the linear corresponding relationship of the phase difference between the time difference of the frequency of the hopping signals which are received in two different positions and the carrier waves of the frequency hopping signals that are received at two positions, and through measuring the phase difference which is between the frequency hopping carrier waves received at two different positions in a plurality of frequency hopping periods, the time difference between the frequency hopping signals which are received at two different positions is estimated. The method comprises the steps of executing band pass filtering to the frequency hopping signal received at two different positions; Hilbert converting in a frequency hopping period and calculating the phase; confirming the phase difference between the frequency hopping signals in two different positions in one frequency hopping period and the middle value of the phase difference; and in the phase difference middle value sequence in K frequency hopping periods, calculating the least square solution of the linear equation set corresponding to the middle value sequence for confirming the time difference estimation of the frequency hopping signal and the like steps. The method of the invention can rapidly estimate time difference to the frequency hopping signal with high frequency, and is widely applied in the frequency hopping radiating signal source positioning system.

Description

Technical field [0001] The invention belongs to the category of signal processing and relates to a time difference estimation method, in particular to a high-precision and fast time difference estimation method for frequency hopping signals. Background technique [0002] High-precision time-difference estimation has important application value in the location of electromagnetic radiation sources in radar, sonar, satellite and communication systems. Since there is a one-to-one correspondence between the time difference between signals received at different locations and the peak position of the cross-correlation function between signal envelopes, this relationship can be used to design a time difference estimation technique. Signals are processed by cross-correlation to realize signal time difference estimation. Among the existing time difference estimation technologies based on this principle, the generalized cross correlation (General Cross Correlation) time difference est...

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Problems solved by technology

Since the time of a frequency hopping period is limited, limiting the signal observation time to a frequency hopping period will also make the lower bound of the variance of the time difference estimation difficult to meet the needs of practical applications

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