Free-air high-speed target detection method based on long-time accumulation

A high-speed target and detection method technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of echo signal coherence deterioration and other problems

Pending Publication Date: 2021-09-14
XIDIAN UNIV +1
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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the object of the present invention is to provide a long-time accumulation-based high-speed target detection method in the air, which adopts the long-time accumulation method of time segmentation, intra-segment coherent accumulation, and inter-segment non-coherent accumulation , which not only solves the problem of long-term coherent accumulation calculation, but also solves the problem of echo signal coherence deterioration; improves the detection performance and is easy to implement in engineering

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Embodiment Construction

[0030] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0031] refer to figure 1 , a kind of high-speed target detection method based on long-term accumulation provided by the present invention, comprising the following steps:

[0032] Step 1: Establish a high-speed maneuvering target motion model, construct a radar echo data model under long-term observation conditions, and sequentially down-convert and low-pass filter the original echo data to obtain the baseband echo data s received by the radar r (t k , t m ); Then, use the matched filter to baseband echo data s r (t k , t m ) to perform pulse compression to obtain the echo data S in the frequency-slow time domain after pulse compression P (f,t m ); wherein, m=0,1,....

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Abstract

The invention belongs to the technical field of radar signal processing, and particularly discloses a free-air high-speed target detection method based on long-time accumulation, and the method comprises the steps: segmenting an echo signal after pulse compression according to the number of pulses, and compensating the range walk and Doppler spread enveloped by the echo signal in each segment; performing intra-segment phase-coherent accumulation on the result after the compensation in each segment; and finally, carrying out inter-segment envelope movement and non-coherent accumulation on all echo signals, so that the energy of the echo signals is effectively accumulated. A long-time accumulation method of time segmentation, intra-segment coherent accumulation and inter-segment non-coherent accumulation is adopted, so that the problem of long-time coherent accumulation calculation amount is solved, and the problem of poor coherence of echo signals is solved; and the detection performance is improved, and engineering realization is easy.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a long-time accumulation-based high-speed target detection method near the sky, which can be used to increase the accumulation gain, reduce the amount of calculation, and is easy for engineering implementation. Background technique [0002] With the development of aerospace technology, hypersonic vehicles have attracted the attention of various military powers because of their extremely attractive military application prospects. It integrates new technologies in many disciplines in the aerospace field, and represents the research and development direction of the aerospace field in the future. It is considered to be another key technical field after the stealth technology in the military. Hypersonic vehicles generally fly in the adjacent space of 20km to 100km, and have the characteristics of long combat distance, fast flight speed, and strong maneuverability. Hea...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 曹运合贺靖刘帅余尚江陈晋央王蒙王从思
Owner XIDIAN UNIV
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