Doppler centroid estimation method based on field programmable gate array (FPGA)
A Doppler center and azimuth technology, which is applied in the field of spaceborne synthetic aperture radar SAR real-time imaging and Doppler center estimation, can solve the problems of insufficient resource utilization, inability to adapt to on-board systems, and lack of DSP chips. Powerful fixed-point processing capability, saving processing time and FPGA internal storage resources, improving the effect of precision
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[0020] specific implementation plan
[0021] The present invention will be further described below in conjunction with the accompanying drawings.
[0022] refer to figure 1 , the specific implementation steps of the present invention are as follows:
[0023] Step 1. Store the arccosine table in the FPGA.
[0024] 1.1) Generate a sequence of floating point numbers e=-1, -511 / 512, -510 / 512,..., 0, 1 / 512, 2 / 512,..., 511 / 512, the floating-point number sequence e contains 1024 elements in total, and the interval between adjacent elements is 1 / 512. The arccosine value of the sequence e is calculated, and the arccosine value of e is quantized into a 16-bit signed binary value. point sequence, and store it in the storage initialization file MIF, then the storage initialization file MIF is an arccosine table;
[0025] 1.2) Call a ROM memory in the FPGA, and initialize the ROM memory with the generated arc cosine table, so that the arc cosine table will be automatically stored insid...
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