Dynamic decoding method for Nbit uniform quantization of anti-saturation synthetic aperture radar (SAR) original data

A technology of uniform quantization and original data, which is applied in the direction of measurement devices, radio wave measurement systems, radio wave reflection/reradiation, etc., to achieve the effects of reducing quantization saturation power loss, improving signal-to-noise ratio, and improving anti-saturation ability

Active Publication Date: 2012-11-28
济钢防务技术有限公司
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[0004] The purpose of the present invention is to provide an anti-saturation SAR original data Nbit uniform quantization dynamic decoding method, to improve the anti-saturation ability of the existing SAR system Nbit uniform quantization, reduce the quantization power loss, improve the quantization signal-to-noise ratio, thereby improving SAR Image Quality

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  • Dynamic decoding method for Nbit uniform quantization of anti-saturation synthetic aperture radar (SAR) original data
  • Dynamic decoding method for Nbit uniform quantization of anti-saturation synthetic aperture radar (SAR) original data
  • Dynamic decoding method for Nbit uniform quantization of anti-saturation synthetic aperture radar (SAR) original data

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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0024] The present invention provides a kind of anti-saturation SAR raw data Nbit evenly quantized dynamic decoding method, its specific implementation steps can be by figure 1 The representation of the image can be subdivided into:

[0025] 1) Know the quantized bit number N of the uniformly quantized SAR raw data to be processed, and use the simulation method to obtain the corresponding curve of the quantized output power and input power of the zero-mean Gaussian distribution signal, image 3 The corresponding curve of output-input power under 4bit uniform quantization is given. It can be seen that the mapping relationship of output-input power is unique in a wide range, and it is not unique only when the output power i...

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Abstract

The invention discloses a dynamic decoding method for Nbit uniform quantization of anti-saturation synthetic aperture radar (SAR) original data, and relates to an SAR signal processing technology. The method comprises the following steps of: obtaining an input signal variance by calculating uniform quantization output power according to a transcendental curve which accords with output power and input power of gaussian distribution data subjected to the Nbit uniform quantization; and decoding by dynamically changing a boundary code for Nbit uniform quantization according to an input signal variance. By the method, the anti-saturation capacity of uniform quantization of the SAR original data is effectively improved, the quantization saturation power loss is remarkably reduced, and the signal to noise ratio of an SAR image is obviously improved.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar signal processing, and relates to an anti-saturation Nbit uniform quantized dynamic decoding method for SAR original data. Background technique [0002] AD quantization is an essential part of a digital system. Synthetic Aperture Radar (SAR) also needs to first sample and quantize the echo received by the antenna, and then store or transmit the data. Considering the complexity of the system, SAR often adopts Nbit uniform quantization, such as RadarSAR-I adopts 4bit uniform quantization, and ERS-1 / 2 adopts 5bit uniform quantization. However, the dynamic range of Nbit uniform quantization is limited by the bit number N, which is only [-2 N-1 +0.5, 2 N-1 -0.5], when the echo signal input by AD quantization is too large and a large amount of data exceeds the dynamic range of uniform quantization, data quantization saturation will occur. Saturation will not only lead to the loss of ...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 仇晓兰胡东辉雷斌丁赤飚
Owner 济钢防务技术有限公司
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