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Combined with the space target observation radar application requirements, related issues of spaceborne MMW (MilliMeter Wave) InISAR (Interferometric Inverse Synthetic Aperture Radar) are researched. A proposed system contains an L-shaped orthogonal observation structure is designed and analyzed basing on a spaceborne platform. The location of a space target can be acquired using imaging and interferometry, and the interferometric phase wrapping is solved by sub-band dual frequency conjugated processing (DFCP). The two-stage space target location method and the spaceborne radar system are presented. Finally, a simulation is designed and proven to be a feasible solution by the simulation experiment which also indicated the direction of the following research work.

Radon-Fourier transform (RFT) realizes the long-time coherent integration to detect weak targets. However, because of discrete pulse sampling, finite range resolution, and limited integration time, the “blind-speed side lobes (BSSL)” of RFT may inevitably appear in real application. This paper proposes Random Carrier-Frequency Radon-Fourier transform (RCFRFT). It is a good solution for low SNR target detection and parameters estimation under Doppler ambiguity of long-range weak targets. Both theoretical analysis and simulation results show that RCF-RFT can be used to suppress BSSL of RFT. Also, it is shown that RCF-RFT significantly improves the detection and measurement ability of the radar.

Synthetic aperture radar is a high resolution imaging radar, SAR signal processing is an important branch of signal processing, while the performance of SAR signal processing system greatly influences the resolution of SAR image. In this paper, a high-performance signal processing system which has strong computation ability, high-width connectivity and flexible expandability is presented, meanwhile, the program design of FPGA is introduced, further more, the RD algorithm implementation result with the system proposed in this paper is provided as an illustration.

Because of synthetic aperture radar (SAR) is a powerful remote sensing technique, there has been growing interest in using SAR to obtain high resolution image. Modern high- performance SAR requires advanced and sophisticated signal processing technique to get high-quality image products. Meanwhile, the semiconductor technologies are updated day after day, programmability and flexibility are the trend of current electronic system, and it leads to the advent of system-on-chip (SOC). The Nios II, a soft-core processor integrated in Altera FPGA chip, is characterized by its flexibility and programmability. In this paper, a dynamic reconfigurable storage and pretreatment system of SAR signal processing is designed and realized based on the Nios II soft-core processor. The proposed architecture takes advantage of the embedded CPU to control all the peripherals, highly increased the efficiency of the design. (4 pages)