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.
Implementation of spaceborne bistatic FMCW SAR imaging algorithm based on multi-core DSP
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.
frequency modulated continuous wave synthetic aperture radar imaging algorithmspaceborne bistaticmulti-core digital signal processorreal-time processing
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