FPGA-based two-dimensional ordered statistical constant false alarm detector implementation method

An implementation method and detector technology, applied in the direction of instruments, measuring devices, radio wave measurement systems, etc., can solve the problems affecting the real-time performance of target detection and detection, increasing the detection delay, etc.

Active Publication Date: 2020-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When using hardware to implement, when the two-dimensional power matrix is ​​too large, the traditional reordering and comparison of cached data will increase the consumption of hardware storage resources, and repeated reading and writing of memory data will increase the detection delay and affect the real-time performance of target detection.

Method used

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  • FPGA-based two-dimensional ordered statistical constant false alarm detector implementation method
  • FPGA-based two-dimensional ordered statistical constant false alarm detector implementation method
  • FPGA-based two-dimensional ordered statistical constant false alarm detector implementation method

Examples

Experimental program
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Effect test

Embodiment

[0070] This example includes the following steps:

[0071] Step 1: Set the shift register bank according to the size of the two-dimensional matrix.

[0072] It is assumed that after the radar echo data passes through MTI and MTD, the size of the two-dimensional power matrix obtained is 30×512. It represents the Doppler dimension unit M=30, and the distance dimension unit L=512.

[0073] Set the distance dimension sliding window length to X=21, the Doppler dimension sliding window length Y=21, the left, right, upper and lower reference units of the reference units are all 8, the number of protection units is 2, and the detection unit is in the middle. False alarm probability is 10e-4, threshold factor coefficient α r = α d = 10.8.

[0074] Program in Verilog language, and use the for statement to call the array to form a register group. The number of register groups is 21, the number of registers in each register group is 30, and the register data bit width is set to 16 bi...

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Abstract

The invention relates to the technical field of radar target detection, and in particular, relates to an FPGA-based two-dimensional ordered statistical constant false alarm detector implementation method. According to the method disclosed by the invention, detection is carried out in each clock period from two-dimensional power matrix input, so that the repeated reading time delay of the data cache is reduced, and the detection speed can be effectively improved. Aiming at the condition of large calculated amount in a traditional OS-CFAR (Ordered Statistical Constant False Alarm Rate) sorting process, the FPGA implementation method is completed by adopting parallel comparison, so that the sorting complexity is reduced. The reusability of a module is fully considered, two-dimensional slidingwindow structure setting is completed through a shifting register set, two-dimensional OS-CFAR detection is achieved, and BRAM memory resources and DSP resources of the FPGA can be saved.

Description

technical field [0001] The invention belongs to the technical field of radar target detection, and in particular relates to an FPGA-based two-dimensional ordered statistical constant false alarm detector implementation method. Background technique [0002] Radar target detection is commonly used in constant false alarm (CFAR) detection, and ordered statistical constant false alarm (OS-CFAR) detection, compared with unit average constant false alarm (CA-CFAR), has a stronger ability to interfere with multiple targets and can effectively suppress Interference with neighboring targets. When detecting a moving target, it is necessary to use the Doppler dimension information of the echo signal. After the echo signal is processed by down-conversion, sampling, pulse pressure, and coherent accumulation, a two-dimensional power matrix can be obtained. Target detection can be performed in range dimension and Doppler two-dimensional CFAR. [0003] The traditional two-dimensional dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/50G01S13/04G01S13/06G01S7/41G01S7/35G01S7/292
CPCG01S13/50G01S13/04G01S13/06G01S7/418G01S7/292G01S7/354
Inventor 宗竹林罗杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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