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Two-phase coding radar signal distance super-resolution method based on target sparsity

A two-phase encoding and radar signal technology, applied to radio wave measurement systems, instruments, etc., can solve difficult and costly problems, and achieve the effect of high distance resolution

Inactive Publication Date: 2021-12-17
NANJING VOCATIONAL UNIV OF IND TECH
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Problems solved by technology

[0003] Modern radars transmit large time-width-bandwidth product signals, and improve the range resolution through pulse compression. At this time, the distance resolution is inversely proportional to the signal bandwidth. To further improve the resolution, the signal bandwidth needs to be increased, which is sometimes difficult in practice. Large or the cost is too high, so it is necessary to study the distance super-resolution problem without increasing the bandwidth

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  • Two-phase coding radar signal distance super-resolution method based on target sparsity
  • Two-phase coding radar signal distance super-resolution method based on target sparsity
  • Two-phase coding radar signal distance super-resolution method based on target sparsity

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Embodiment Construction

[0065] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0066] The present invention provides a distance super-resolution method for two-phase coded radar signals based on target sparsity. Under the condition of the same radar signal bandwidth, the present invention breaks through the Rayleigh limit of conventional pulse pressure and realizes distance super-resolution; Resolution improves the performance of radar target detection, imaging, and classification recognition.

[0067] A range super-resolution method for biphase encoded radar signals based on target sparsity, such as figure 1 shown, including the following steps:

[0068] 1) Perform matched filter processing on the bi-phase encoded echo signal of the radar target;

[0069] Specifically,

[0070] 1-1) Assuming that the radar transmits a two-phase encoded signal, its envelope u(t) is expressed as,

[0071]

[0072] In the formula, t is the time, P...

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Abstract

The invention discloses a two-phase coding radar signal distance super-resolution method based on target sparsity. The method comprises the following steps: 1) carrying out matched filtering processing on a two-phase coding echo signal of a radar target; 2) establishing a distance dimension sparsity model of the target echo signal; and 3) resolving the maximum posterior probability estimation of the sparse amplitude vector to obtain a target signal amplitude, and obtaining a target distance and realizing distance super-resolution. Under the condition that the bandwidths of the two-phase coded signals are the same, the Rayleigh limit of conventional pulse pressure is broken through, and distance super-resolution is achieved; and radar target detection, imaging and classification identification performance is improved by distance super-resolution.

Description

technical field [0001] The invention relates to the distance resolution of radar, in particular to a distance super-resolution method for biphase coded radar signals based on target sparsity. Background technique [0002] In the radar system, the range resolution is an important indicator, and improving the range resolution is the basis for radar target detection, imaging, and classification recognition. [0003] Modern radars transmit large time-width-bandwidth product signals, and improve the range resolution through pulse compression. At this time, the distance resolution is inversely proportional to the signal bandwidth. To further improve the resolution, the signal bandwidth needs to be increased, which is sometimes difficult in practice. Therefore, it is necessary to study the distance super-resolution problem without increasing the bandwidth. Contents of the invention [0004] The object of the present invention is to provide a method for distance super-resolution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/418
Inventor 陈希信李坡弓盼王洋张庆海
Owner NANJING VOCATIONAL UNIV OF IND TECH
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