Research Of High Squint SAR Algorithm And Real-time Implement

A recent development of Synthetic Aperture Radar (SAR) imaging technique promotes the squint SAR to a gradually significant role due to its flexible beam steering, strong alarming ability, etc. Therefore, a study by utilizing special observing angles of the squint SAR improves an algorithm in its resolutions and focusing performance. And the corresponding theory is carried out in hardware, giving it an important value in research.This dissertation proposes an improved squint Range-Doppler (RD) algorithm based on traditional squint SAR imaging algorithms. Meanwhile, it adopts high-performance FPGA and multi-core DSP for a hardware processing platform and then validates the algorithm. Detailed contents are shown as follows:(1) This dissertation analyzes principles of traditional squint SAR imaging algorithms. Then, we propose an improved squint RD algorithm model with a 4-order accuracy and make the phase error within π/4, which achieves an effective azimuth focusing performance.(2) This dissertation proposes a designing schedule for the hardware processing platform for the demands of corresponding algorithm. It also analyzes the power consumption of selected processors and clocks and draws up a design of power and clock modules. Besides, it emphasizes on the designing principles and methods of these processors and, at the same time, illustrates connections of every high-speed serial interface.(3) This dissertation analyzes the exploitation of processors’ drive programs based on the high-speed serial agreements and database’s format. This operation fulfills the demands of high-speed data transmission between each two processors.(4) This dissertation tests layers with simulated data on the basis of a reasonable distribution of processors’ algorithm demands, and thus validating its effectiveness and real-time processing performance of the hardware platform. In sum, this dissertation successfully establishes a model of an improved squint RD algorithm, conducts simulations, and tests the hardware platform. Admittedly, the improvements of the resolutions achieved, the structures of the hardware platform, and the drive programs can still be further made in the future.