Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When changing the imaging mode according to the needs, it involves changing the radar hardware equipment such as the analog filter bandwidth, which brings problems such as complex radar equipment and lack of flexibility.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01S7/41G01S13/90
Inventor 王岩飞李亚柯刘畅
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com