Target detection method based on coherent radar non-coherent accumulation mode

A non-coherent accumulation, target detection technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as large computational load, increased difficulty in distance travel compensation and phase supplementation, and limited application, to improve the signal-to-noise ratio, Improve radar detection probability and improve the effect of signal-to-noise ratio

Pending Publication Date: 2022-01-04
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

However, these algorithms have a huge amount of computation, and their applications on space-based radar real-time processing platforms are limited
At the same time, for space-based warning radars, if the speed of movement is unknown and there is a problem of Doppler frequency folding, this also increases the difficulty of distance walking compensation and phase supplementation

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  • Target detection method based on coherent radar non-coherent accumulation mode
  • Target detection method based on coherent radar non-coherent accumulation mode
  • Target detection method based on coherent radar non-coherent accumulation mode

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Embodiment Construction

[0058] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0059] Such as figure 1 As shown, it is a target detection method based on the non-coherent accumulation mode of coherent radar of the present invention, the method includes:

[0060] S1. Sampling to obtain a frame of two-dimensional echo data.

[0061] In the present embodiment, the signal form of the two-dimensional echo data is an LFM signal (linear frequency hopping signal), assuming that the pulse number of each frame of the LFM signal is N, each pulse samples M points, and the sampling interval is t s , the pulse repetition period is T r , the pulse width is T P , the frequency modulation slope of each sub-pulse is k, and the sub-pulse bandwidth is B, then k=B / T P ;Set the initial radial distance of the uniform moving target as R 0 , the radial motion speed is v 0 , the target range delay of the i-th ...

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Abstract

The invention discloses a target detection method based on a coherent radar non-coherent accumulation mode. The method comprises the following steps: S1, performing sampling to obtain a frame of two-dimensional echo data; S2, performing pulse compression on each piece of data in the S1; S3, performing range walk calibration on the data in the S2; S4, performing coherent accumulation on the data in the S3; S5, repeating the steps S1 to S4 to obtain multi-frame coherent accumulation data; S6, performing inter-frame alignment on the multi-frame coherent accumulation data obtained in the step S5; S7, performing non-coherent accumulation on the multi-frame coherent accumulation data after inter-frame alignment; and S8, performing target detection based on the non-coherent accumulation data in the S7. The method has the advantages that range walk calibration is realized based on an inter-pulse autocorrelation method, and the detection of a moving target subjected to long-time coherent accumulation is realized; according to the method, after peak target alignment is carried out on two-dimensional data planes among multiple adjacent frames, non-coherent accumulation is carried out, then target detection is carried out, the purpose of improving the signal-to-noise ratio is achieved, and meanwhile target speed estimation can be achieved.

Description

technical field [0001] The invention relates to the technical field of target detection, in particular to a target detection method based on a non-coherent accumulation method of coherent radar. Background technique [0002] Space-based warning radar is an important application field in the development of space-based radar. It is of great significance to realize the moving target indication function of space-based warning radar, and its target detection method has become a hot spot in the research of radar signal processing. The accumulation of weak target energy is the main research direction to improve the echo signal-to-noise ratio and realize weak target detection. However, due to the design requirements of light weight and low power consumption of space-based radar, its transmission power and antenna gain are all limited. When performing target warning, it often achieves capability accumulation through long-term coherent accumulation to achieve long-distance detection....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 谭姗姗江利中赵建华高林星史秀花邹波
Owner SHANGHAI RADIO EQUIP RES INST
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