Doppler compensation method for phase-coded signal based on tracking information

Abstract

The invention provides a Doppler compensation method for a phase-coded signal based on tracking information. The Doppler compensation method comprises the following steps: estimating a Doppler compensation range of a target echo; performing sliding window detection on the target echo in the Doppler compensation range to obtain phase information, and comparing a differential mean value result of the phase information with a threshold value; when the differential mean value result is larger than the threshold value, obtaining the actual position of the target echo, determining whether the difference value between the target speed information and the target speed predicted by the tracking algorithm is within the Doppler tolerance bandwidth or not, and performing Doppler compensation on the target echo according to the judgment result; and when the differential mean value result of the phase information is less than or equal to the threshold, performing Doppler compensation on the target echo by using the target speed in the Doppler compensation range. According to the technical scheme provided by the invention, the Doppler compensation problem of the multi-target phase encoding echo signal is effectively solved.

Description

technical field [0001] The invention relates to the technical field of airborne radar, in particular to a Doppler compensation method based on a tracking information-based phase encoding signal. Background technique [0002] Phase-encoded signal is a commonly used pulse compression signal, which is widely used in modern radars because of its low interception, easy implementation of practical circuits, strong anti-fading ability, and strong anti-jamming ability. The phase-encoded signal is very sensitive to the Doppler frequency shift. With the increase of the Doppler frequency, the range sidelobe performance of the pulse compression signal deteriorates sharply, which seriously affects the pulse pressure performance, so that the phase-encoded pulse pressure radar is only suitable for When the Doppler frequency shift is small. [0003] In recent years, different schemes have emerged in practice to solve the Doppler sensitivity problem of phase-encoded signals when the current...

AI Technical Summary

Problems solved by technology

The multi-channel Doppler compensation algorithm is simple in theory and easy to implement in software, but there are also problems such as doubling the amount of calculation, increasing the storage space of the hardware, and being unable to directly realize multi-target detection.

In addition, the Doppler sensitivity problem of phase-encoded signals is solved by constructing an optimal code with shift multiplication characteristics, and it is theoretically proved that only a single filter channel is needed to compensate for Doppler frequency shift , but this method has the disadvantages of difficulty in finding the optimal code and serious loss of Doppler frequency resolution

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