High-speed target phase thrust speed measurement method based on stepped frequency chirp signal

Abstract

The invention provides a high-speed target phase thrust speed measurement method based on a stepped frequency chirp signal, and the method comprises the following specific processes of step 1, establishing a high-speed target echo model based on the stepped frequency chirp signal, and considering the influence of intra-pulse time modulation on the target echo delay in the process of establishing the model; step 2, subjecting the echo model to the pulse pressure matching processing of a single pulse, and compensating a secondary phase term existing in the spectral phase in the pulse pressure processing; step 3, subjecting the result of the pulse pressure processing to coherent synthesis processing to obtain a one-dimensional high-resolution distance image; and step 4, realizing the phase thrust speed measurement based on the one-dimensional high-resolution distance image. The method provided by the invention establishes a high-speed target echo model considering the intra-pulse Dopplermodulation, derives a phase thrust speed measurement model considering acceleration, can be applied to a high-speed target of radial motion including acceleration and jerk, and meets engineering application requirements.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a high-speed target phase estimation method based on a frequency modulation step signal. Background technique [0002] With the rapid development of radar technology, people put forward higher requirements for radar accurate measurement. For example, fretting extraction is a research hotspot of target detection and identification. The key problems are that the translation compensation is not accurate enough, the fretting amplitude is small, and the fretting points are difficult to distinguish. The fretting feature information is not obvious, which makes the fretting extraction difficult. big. The most effective way to break through this bottleneck is to improve the radar's ability to describe fine movements, that is, to improve the radar's ability to accurately measure speed. The traditional envelope ranging has limited accuracy, and the traditional speed ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, in order to solve the problem of accurate speed measurement of high-speed targets, and propose a method for phase estimation of high-speed targets based on frequency modulation step signals

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