Phase-coherent accumulation method based on SKT-SIAF-MSCFT

A technology of coherent accumulation and echo signals, applied in radio wave measurement systems, instruments, etc., can solve problems such as complex motion characteristics, achieve low computational complexity, high engineering practical significance, effective coherent accumulation and parameter estimation. Effect

Active Publication Date: 2020-10-02
XIDIAN UNIV
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Problems solved by technology

Although the research results in this field are fruitful, for targets with more complex motion characteristics, problems such as reduction of computation, improvement of accumulation performance, and practical engineering practicability in the long-term coherent accumulation process still need to be resolved.

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  • Phase-coherent accumulation method based on SKT-SIAF-MSCFT
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  • Phase-coherent accumulation method based on SKT-SIAF-MSCFT

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Embodiment Construction

[0025] 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.

[0026] refer to figure 1 , a kind of coherent accumulation method based on SKT-SIAF-MSCFT provided by the present invention, comprises the following steps:

[0027] Step 1. The radar transmits and receives the echo signal, performs pulse compression processing on the echo signal and performs FFT along the fast time dimension, and obtains the echo signal s in the range frequency-slow time domain r (t m ,f);

[0028] (1.1) Set the radar to transmit M pulse linear frequency modulation (LFM) signals within a coherent processing interval (CPI), then the mth pulse signal s(t m ,τ) is expressed as:

[0029]

[0030] Among them, rect() is a rectangle function, T 6 is the ...

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Abstract

The invention discloses a phase-coherent accumulation method based on SKT-SIAF-MACFT, and the method comprises the steps: carrying out the pulse compression of an echo signal, carrying out the FFT along a fast time dimension, carrying out the SKT conversion, and eliminating the range walk; estimating the slope of the straight line by adopting Radon transformation to obtain an estimated value of the fuzzy number; constructing a phase compensation function according to the estimated ambiguity number, and eliminating residual distance walk; adopting an SIAF-MACFT algorithm to estimate the acceleration of the target; and constructing a compensation function by adopting the estimated target acceleration, eliminating the influence of the acceleration on Doppler frequency walking, and performingFFT processing along a slow time dimension to complete phase-coherent accumulation of target signal energy. According to the method, for the uniformly accelerated moving target, range walk and Dopplerfrequency walk in a target echo signal can be effectively corrected, effective phase-coherent accumulation and parameter estimation are realized, the calculation complexity is low, and the accumulation gain is high.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to an SKT-SIAF-MSCFT-based coherent accumulation method. Background technique [0002] In recent years, the rapid development of stealth aircraft and unmanned aerial vehicles (UAVs) has put forward more and more requirements for radar maneuvering weak target detection. In order to detect such low radar cross section RCS targets, long-term coherent accumulation has become a convenient and efficient method. Unfortunately, complex motions of maneuvering targets (such as high velocity, acceleration, and jerk) will cause range migration and Doppler frequency migration, and these unfavorable factors will seriously deteriorate the performance of traditional accumulation algorithms such as moving target detection MTD . [0003] It is of great significance to study the problem of coherent accumulation of high-speed moving targets, improve the detection performance of radar ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41Y02A90/10
Inventor 朱圣棋高雅王如杰许京伟曾操刘婧李军
Owner XIDIAN UNIV
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