SAR data compression system and method for improving compression quality BAQ

Abstract

The invention discloses a synthetic aperture radar SAR data compression system and a method for improving compression quality block self-adaptive quantization BAQ. The system comprises a control module, a data reading module, a compression module, a data splicing module, a check module and a code stream output module. The system uses the control module to receive the SAR data of the synthetic aperture radar and coordinate the operation of each module; the data reading module reads the minimum compressed unit data; the compression module uniformly quantizes the phase value of the minimum compressed unit data, carries out block adaptive quantization coding on the amplitude logarithm, and obtains lossy compression data; the non-compression, lossless and lossy compression data are processed bythe data splicing module, the check module and the code stream output module to obtain an output code stream. The system has the advantages of high compression quality and multi-coding modes, and canbe used for compressing the synthetic aperture radar SAR data.

Description

technical field [0001] The present invention belongs to the technical field of digital signal processing, and further relates to a synthetic aperture radar SAR (Synthetic Aperture Radar) data compression system and method for improving compression quality block adaptive quantization BAQ (Block Adaptive Quantization) in the digital signal processing technical field . The present invention utilizes the synthetic aperture radar SAR data compression system realized by Field Programmable Gate Array FPGA (Field Programmable Gata Array) to perform data processing on the synthetic aperture radar SAR data stored in the static random access memory SRAM (Static Random Access Memory) on the star. Compression reduces the amount of transmitted data and then downloads it to the ground for decoding, pulse pressure processing and analysis characteristics. Background technique [0002] Synthetic Aperture Radar (SAR) is an advanced active earth observation equipment. It has the characteristic...

AI Technical Summary

Problems solved by technology

The disadvantage of this system is that for the quantized coding table in the core processor, only 2, 3, 4 bit quantized look-up tables are supported, and the resource occupation of the mapping table is too large

The disadvantage of this method is that since the information of the echo data mainly comes from the data after the pulse pressure, and the phase information is the main factor affecting the quality of the pulse compression, the two-way compression of the real part and the imaginary part cannot be well done. Preserve phase information

The shortcomings of this system are, first, it does not support lossless compression; second, only one quantization encoding bit is supported in the compression mode, and different quantization bits cannot be selected according to the instruction.

The disadvantage of this method is that the original data information is compressed without distinguishing between large and small signals. If there are many small signals in the original synthetic aperture radar SAR data, the loss of compression performance will be relatively large.

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