Time difference estimation method and device for linear frequency modulation signals

Abstract

The invention relates to the field of signal detection and estimation, and discloses a time difference estimation method and device for a linear frequency modulation signal, and the method comprises the steps that a sampling quantification module carries out the sampling quantification of the received linear frequency modulation signal, and then a cross-correlation module carries out the cross-correlation operation of the sampled and quantified linear frequency modulation signal; a peak value detection module performs peak value detection on the cross-correlation operation result, detects themaximum result value, and obtains a corresponding serial number; and finally, a time difference estimation module calculates the arrival time difference of the linear frequency modulation signal according to the serial number. According to the method, the time difference of the arrival signals can be accurately estimated without priori information such as the cyclic frequency of the linear frequency modulation signals, so that the method can also be applied to a non-cooperative signal environment; the method and the device provided by the invention can be used for high-precision measurement oflinear frequency modulation signal time difference in the fields of radar, communication, sonar, electronic warfare and the like, and provide a basis for passive time difference positioning.

Description

technical field [0001] The invention relates to the field of signal detection and estimation, in particular to a time difference estimation method and device for linear frequency modulation signals. Background technique [0002] Using time difference information for target location is a widely used passive location method. This method uses multiple receiving stations at different locations to receive radiation source signals, and realizes radiation source location by estimating the time difference between received signals. Time difference positioning has the characteristics of high positioning accuracy and strong anti-interference ability. As a common signal form, chirp signal has been widely used in many fields such as radar, communication, sonar and electronic warfare. Based on the above reasons, the time difference estimation of chirp signal is of great significance. [0003] At present, the time difference estimation methods of chirp signals are mainly divided into two...

AI Technical Summary

Problems solved by technology

However, this method needs to accurately obtain the cycle frequency of the chirp signal, and when there is a cycle frequency error, the accuracy of time difference estimation will be significantly reduced

Images