Codec method and codec device for initial data compression of synthetic aperture radar with fixed frame size
A technology of synthetic aperture radar and coding and decoding method, which is applied in the field of spaceborne synthetic aperture radar raw data compression, can solve problems such as the change of the frame length of SAR raw data, and achieve the effects of good engineering application prospects, simplified complexity and easy implementation.
Active Publication Date: 2012-06-27
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0005] In order to solve the problem of SAR original data frame length change when encoding a single sampling point, the purpose of the present invention is to ensure that the encoded data frame length is a fixed frame length, thereby simplifying the complexity of SAR system integration testing and subsequent data processing. A method for joint coding of sampling points, the data frame length encoded by this method is a fixed frame length, for this reason, the present invention provides a method and device for encoding and decoding original data compression of a fixed frame length synthetic aperture radar
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[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] Such as figure 1 As shown, the overall coding idea is to combine several actual sampling points N quantized by the A / D quantizer to form a virtual sampling point, and then perform scalar or vector quantization on the virtual sampling point. The quantized results are encoded as a whole. The encoding method is to use binary codes to represent all possible combinations of multi-sampling point quantization results. The binary coded result is used as the only reference when decoding.
[0022] Assuming that the number of actual sampling points is N and the number of quantization levels is Q, then k actual sampling points may be combined into Q k , the length of the binary code is p, if it satisfies the formula,
[0023] 2 P ≥Q k (1)
[0024] Then Q can be represented by p binary codes k A virtual sampling point represented by a combination, ...
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The invention relates to a codec method and a codec device for initial data compression of synthetic aperture radar with fixed frame size, which are applicable to fractional bit rate initial data compression of synthetic aperture radar. The method is characterized in that the frame size of coded data is ensured to be the fixed frame size so as to simplify complexity of SAR system integration testing and subsequent data processing; the particular structure of the device is mainly realized by constructing a two-dimensional lookup table, wherein the first dimensional lookup table is a quantitative grade lookup table, and the second dimensional lookup table is a coding grade lookup table; sampling data of a plurality of synthetic aperture radar are operated by looking up the two-dimensional lookup table to achieve the effect of fractional bit rate compression of the fixed frame size.
Description
technical field [0001] The invention belongs to the field of space-borne synthetic aperture radar (SAR) raw data compression, and relates to a coding and decoding method and device, which is suitable for a fractional bit rate SAR raw data compression algorithm, and is characterized in that the encoded data frame length is a fixed frame length , thus simplifying the complexity of SAR system integration testing and subsequent data processing. Background technique [0002] Spaceborne SAR raw data compression is an effective way to solve the problem that the mass data acquired by spaceborne SAR is difficult to match with the onboard data transmission bandwidth. At present, although there are many types of compression algorithms on the planet, only BAQ (Block Adaptive Quantization) is practical when considering the performance of the compression algorithm and the complexity of its hardware implementation. The core quantizer of the algorithm is the Lloyd-Max quantizer. [0003] ...
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IPC IPC(8): G01S7/41G01S13/90
Inventor 邓云凯张志敏祁海明禹卫东
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI