基于多核DSP的星载双基FMCW SAR成像算法实现

doi:10.12305/j.issn.1001-506X.2024.01.14

Abstract

Abstract:

Frequency modulated continuous wave (FMCW) synthetic aperture radar (SAR) reduces the peak transmission power of the sensor, minimizes the weight and cost of the system, and is widely used in airborne platforms. The bistatic architecture and FMCW technology are combined to form the spaceborne bistatic FMCW SAR. It is widely used in airborne platforms. In this paper, the range-Doppler (RD) algorithm is improved to establish a high-performance FMCW SAR imaging frequency domain algorithm and the imaging effect is better, which is suitable for the spaceborne bistatic platform, whose processing accuracy is significantly improved. Based on multi-core digital signal processor (DSP), a parallel processing architecture suitable for spaceborne bistatic SAR imaging algorithm is constructed, and the hardware and software are designed and implemented. It is verified that the proposed software architecture can meet the real-time imaging requirements and the feasibility of the engineering implementation of the algorithm.

Key words: frequency modulated continuous wave synthetic aperture radar imaging algorithm, spaceborne bistatic, multi-core digital signal processor, real-time processing

CLC Number:

TN957.52

Yang CHEN, Guoyao XIAO, Yinghui QUAN, Aifeng REN, Bowen BIE, Mengdao XING. Implementation of spaceborne bistatic FMCW SAR imaging algorithm based on multi-core DSP[J]. Systems Engineering and Electronics, 2023, 46(1): 121-129.

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References 30

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参数名称	参数值
轨道高度/km	500
双星间距/km	10~12
下视角/(°)	31.5
占空比/%	85
脉冲重复频率/Hz	4 000
发射带宽/MHz	150
采样频率/MHz	25
采样时宽/μs	250
合成孔径时间/s	0.506 5
载波频率/GHz	35.75

性能指标	PSLR		ISLR
性能指标	距离向	方位向	距离向	方位向
仿真结果	-13.24	-13.38	-9.6	-9.7
DSP处理结果	-13.25	-13.30	-9.5	-9.6

参数名称	参数值
轨道高度/km	500
双星间距/km	10~12
下视角/(°)	31.5
占空比/%	85
射频频率/GHz	15
采样频率/MHz	480
脉冲重复频率/Hz	8 000
脉冲宽度/μs	2
合成孔径时间/s	0.672 3

算法模块	优化前	优化后
RVP补偿和多普勒中心补偿	0.56	0.29
转置	0.48	0.35
距离徙动校正	0.49	0.19
方位脉压	1.17	0.87
总计	4.10	3.00

[1]	Xiao TAN, Zhiwei YANG, Pengyuan HE, Xiangyu WU. Analysis of clutter characteristics and parameters selection for following configuration of spaceborne bistatic radar [J]. Systems Engineering and Electronics, 2023, 45(9): 2735-2743.
[2]	Mengyu NI, Hui CHEN, Xiaoge WANG, Yang CHENG, Binbin LI. Clutter modeling and characteristic analysis of spaceborne bistatic radar [J]. Systems Engineering and Electronics, 2023, 45(4): 1024-1031.
[3]	Pengyuan HE, Zhiwei YANG, Xiao TAN. Performance analysis and configuration optimization of clutter repection ability of spaceborne bistatic radar [J]. Systems Engineering and Electronics, 2022, 44(2): 440-447.

Implementation of spaceborne bistatic FMCW SAR imaging algorithm based on multi-core DSP

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