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

系统工程与电子技术 ›› 2023, Vol. 46 ›› Issue (1): 121-129.doi: 10.12305/j.issn.1001-506X.2024.01.14

• 传感器与信号处理 • 上一篇

基于多核DSP的星载双基FMCW SAR成像算法实现

陈洋¹, 肖国尧¹^,*, 全英汇¹, 任爱锋¹, 别博文¹, 邢孟道²

1. 西安电子科技大学电子工程学院, 陕西西安 710071
2. 西安电子科技大学前沿交叉研究院, 陕西西安 710071

收稿日期:2022-03-24 出版日期:2023-12-28 发布日期:2024-01-11
通讯作者: 肖国尧
作者简介:陈洋 (1998—), 女, 硕士研究生, 主要研究方向为基于多核DSP的雷达信号处理
肖国尧 (1986—), 男, 副教授, 主要研究方向为多功能一体化集成微系统技术
全英汇 (1981—), 男, 教授, 博士, 主要研究方向为敏捷雷达、雷达遥感
任爱锋 (1974—), 男, 教授, 博士, 主要研究方向为自主可控微系统
别博文 (1991—), 男, 讲师, 博士, 主要研究方向为合成孔径雷达成像
邢孟道 (1975—), 男, 教授, 博士, 主要研究方向为SAR/ISAR成像、动目标检测
基金资助:
国家自然科学基金(61772397)

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

Yang CHEN¹, Guoyao XIAO¹^,*, Yinghui QUAN¹, Aifeng REN¹, Bowen BIE¹, Mengdao XING²

1. School of Electronic Engineering, Xidian University, Xi'an 710071, China
2. Academy of Advanced Interdisciplinary Research, Xidian University, Xi'an 710071, China

Received:2022-03-24 Online:2023-12-28 Published:2024-01-11
Contact: Guoyao XIAO

摘要/Abstract

摘要：

调频连续波(frequency modulated continuous wave, FMCW)合成孔径雷达(synthetic aperture radar, SAR) 降低了传感器的峰值传输功率, 使系统的重量和成本最小化, 被广泛应用于机载平台。将双基地构型与FMCW技术相结合, 应用于星载平台, 即构成星载双基地FMCW SAR。本文对距离多普勒(range-Doppler, RD)算法进行改进, 建立起一种高性能的适宜星载双基地平台的FMCW SAR成像频域算法, 这种算法的处理精度明显提高, 成像效果更好。基于多核数字信号处理器(digital signal processor, DSP)构建适用于星载双基SAR成像算法的并行处理架构, 完成软硬件设计实现。验证了所提软件架构可以满足实时成像需求, 以及算法工程化实现的可行性。

关键词: 调频连续波合成孔径雷达成像算法, 星载双基, 多核数字信号处理器, 实时处理

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

中图分类号:

TN957.52

陈洋, 肖国尧, 全英汇, 任爱锋, 别博文, 邢孟道. 基于多核DSP的星载双基FMCW SAR成像算法实现[J]. 系统工程与电子技术, 2023, 46(1): 121-129.

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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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

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基于多核DSP的星载双基FMCW SAR成像算法实现

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

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