Antisaturation quantization encoding and decoding method for spaceborne SAR raw data

A technology of quantization coding and raw data, which is applied in the direction of measurement devices, code conversion, radio wave measurement systems, etc., can solve the problems of BAQ algorithm performance degradation and achieve the effect of improving performance

Active Publication Date: 2009-04-01
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] In order to solve the problem in the prior art that the performance of the BAQ algorithm is reduced when the ADC is saturated, the purpose of the present invention is to improve the BAQ (Block Adaptive Quantization) algorithm to contain mo

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  • Antisaturation quantization encoding and decoding method for spaceborne SAR raw data
  • Antisaturation quantization encoding and decoding method for spaceborne SAR raw data
  • Antisaturation quantization encoding and decoding method for spaceborne SAR raw data

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the described embodiments are only intended to facilitate the understanding of the present invention, rather than limiting it in any way.

[0053] attached Figure 1.1 For prior art BAQ compression, decompression flowchart, attached Figure 1.2 It is a flowchart of compression and decompression in the present invention, wherein the solid line boxes represent the same processing manner, and the dotted line boxes represent different processing manners.

[0054] as attached Figure 1.1 And attached Figure 1.2 As shown: for the sampling data with high saturation, when compressing, different from the processing method in the prior art, the present invention uses the standard deviation of the ADC output signal to normalize the sampling signal. At the same time, the quantizer uses an anti-saturation optimal nonlinear scalar quantizer to replace the t...

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Abstract

The invention provides an anti-saturation quantization coding and decoding method used for spaceborne SAR original data, comprising the steps as follows: partitioned data is normalized according to the mapping relationship between ADC output signal amplitude average value and ADC output signal standard difference; the normalized high-saturation partitioned data is quantized; the normalized low-saturation partitioned data is quantized; the high-saturation partitioned data and the low-saturation partitioned data are distinguished according to coding address, thus gaining the coding data; the coding data is decoded to gain the decoding data; the decoding data is normalized (namely power compensation) according to the mapping relationship between the ADC output signal amplitude average value and ADC input signal standard difference. The method apparently improves the performance of BAQ arithmetic during the saturation of ADC and can achieve the object by changing the quantization coding in FPGA only, without changing the software and hardware for BAQ arithmetic.

Description

technical field [0001] The invention belongs to the field of space-borne SAR original data compression, and relates to a method for anti-saturation quantization encoding and decoding of space-borne SAR original data. Background technique [0002] Spaceborne SAR raw data compression is an effective way to solve the problem that the large amount of data acquired by spaceborne SAR is difficult to match with the bandwidth of onboard data transmission. At present, although there are many kinds of compression algorithms on the planet, only BAQ (Block Adaptive Quantization) and BFPQ (Block Floating PointQuantization) are practical when considering the compromise between the performance of the compression algorithm and the complexity of its hardware implementation. The former is a time-domain compression algorithm for fixed-point numbers, and the latter is a time-domain compression algorithm for floating-point numbers. [0003] In the practical application of the BAQ algorithm, the...

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Application Information

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IPC IPC(8): G01S13/90G01S7/02H03M7/30
Inventor 祁海明禹卫东陈曦
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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