Two-stage filter achieving method of high-speed data extraction of synthetic aperture radar

A technology of synthetic aperture radar and high-speed data, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc. It can solve the problems of complex radar equipment and lack of flexibility, and achieve reduced complexity and fast Efficient handling and increased flexibility

Inactive Publication Date: 2012-07-11
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

When changing the imaging mode according to the needs, it involves changing the radar hardware equipment su...

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  • Two-stage filter achieving method of high-speed data extraction of synthetic aperture radar
  • Two-stage filter achieving method of high-speed data extraction of synthetic aperture radar
  • Two-stage filter achieving method of high-speed data extraction of synthetic aperture radar

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Embodiment Construction

[0028] 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.

[0029] Such as figure 1 as shown, figure 1 It is a traditional SAR echo signal acquisition method. Limited by the A / D sampling rate, the signal received by the receiver is first filtered by an analog filter to reduce the bandwidth, and then enters the A / D sampler for sampling. The sampled and quantized signal is directly processed in the range direction after being down-sampled. The disadvantage of this method is that if the received signals have different bandwidths, it is necessary to adjust the passband width of the first-stage analog filter, which involves hardware adjustments that are cumbersome and inflexible.

[0030] Such as figure 2 as shown, figure 2 It is a block diagram of a two-stage filtering implemen...

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Abstract

A two-stage filter achieving method of high-speed data extraction of a synthetic aperture radar comprises setting the order of a filter according to imaging parameter requirements of the synthetic aperture radar, processing time of a real-time processor and requirements of data volume, selecting an appropriate filter according to the set order, pre-filtering receiving signals after sampling, extracting the data after pre-filtering, performing high-performance filtering on the data after extraction, and compressing the distance. By means of the two-stage filter achieving method of the high-speed data extraction of the synthetic aperture radar, the data volume and the processing time can be reduced by reducing the order of the filter. In addition, flexibility and convenience of a system can be greatly improved by utilizing a digital filter to replace a simulation filter.

Description

technical field [0001] The invention relates to the field of synthetic aperture radar (SAR) signal processing, in particular to a two-stage filtering implementation method for high-speed data extraction of synthetic aperture radar. technical background [0002] Synthetic Aperture Radar (SAR) is a microwave remote sensing method for imaging and observing ground targets. It has the advantage of being able to work around the clock, so it is widely used in national defense, natural resource exploration, disaster monitoring and other fields. The real-time imaging processor processes the target echo signals collected by the SAR system to form radar images in real time, which is an essential part of the SAR system for applications with time-sensitive requirements. In the usual airborne SAR system, the method of obtaining the received signal is to perform analog filtering first, then carry out AD sampling, and then carry out processing such as distance compression. When changing t...

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Application Information

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IPC IPC(8): G01S7/41G01S13/90
Inventor 王岩飞李亚柯刘畅
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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