Multichannel synthetic aperture radar system channel equalization method based on sample selection

A synthetic aperture radar and channel equalization technology, applied in the field of physics, can solve problems such as performance degradation, and achieve the effects of fast speed, excellent performance, and simple method and process design.

Active Publication Date: 2016-03-23
SHANGHAI INST OF ELECTROMECHANICAL ENG
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiency that all samples are used in the adaptive weight training of the existing channel equalization technology, the present invention proposes a channel equalization method based on sample selection, which can effectively avoid side effects by selecting samples in the main beam for adaptive weight training. Performance degradation caused by samples in the lobe and noise regions

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
  • Multichannel synthetic aperture radar system channel equalization method based on sample selection
  • Multichannel synthetic aperture radar system channel equalization method based on sample selection
  • Multichannel synthetic aperture radar system channel equalization method based on sample selection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] refer to figure 1 , first input the multi-channel synthetic aperture radar data. Without loss of generality, only two channels are considered, and channel 1 is the reference channel, and channel 2 is the channel to be calibrated. Denote the data from the two-dimensional frequency domain of channel 1 and channel 2 as and , is the distance frequency, is the Doppler frequency. figure 2 The schematic diagram of useful signal area and noise area of ​​SAR echo in range frequency domain is given. It can be seen that the frequency range of the signal in the distance frequency domain is , is the sampling frequency of the signal. The frequency range of the useful signal is , is the frequency bandwidth of the signal in the range frequency domain. image 3 A schematic diagram of the main lobe area and side lobe area of ​​the SAR echo in the Doppler frequency domain is given. It can be seen that the Doppler domain frequency range of the signal is , is the pu...

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

The invention discloses a multichannel synthetic aperture radar system channel equalization method based on sample selection. The method comprises the step 1: iteration initialization; the step 2: distance frequency domain frequency domain calibration; the step 3: doppler domain calibration; and the step 4: iteration termination condition determination, wherein if the iteration termination condition is satisfied, the process comes to an end, and if not, returning to the step 2. The multichannel synthetic aperture radar system channel equalization method based on sample selection effectively improves the performance for adaptive two dimension calibration. By adding a sample selection strategy before training an adaptive weight, the multichannel synthetic aperture radar system channel equalization method based on sample selection can effectively avoid the problem that in a traditional method, the low clutter noise ratio sample point in a sidelobe zone and a noise zone causes reduction of performance. The multichannel synthetic aperture radar system channel equalization method based on sample selection is suitable for compensation of the range and the phase error among channels for various different multichannel synthetic aperture radar systems, such as airborne, spaceborne and missile-borne multichannel synthetic aperture radars.

Description

technical field [0001] The invention belongs to the field of physics, and in particular relates to a channel equalization method based on a sample selection strategy in the field of synthetic aperture radar systems. Background technique [0002] In the field of synthetic aperture radar, in order to detect ground moving targets, it is necessary to eliminate the interference from the clutter background, so clutter suppression is required. The most common and effective solution is to use the spatial degrees of freedom obtained by multi-channel technology to complete clutter suppression. In order to obtain better clutter suppression performance, it is usually necessary to compensate the amplitude and phase errors between channels, that is, to perform channel equalization processing. [0003] At present, the channel equalization technology in SAR is mainly carried out in the two-dimensional frequency domain. Ender proposed an adaptive two-dimensional calibration (A2DC) method i...

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): G01S13/90G01S7/40
CPCG01S7/40G01S13/904G01S13/9076
Inventor 陈朝焰赵元楠吕瑞恒陆加田野潘金波陆波张迪胡珊黄伟忠杨革文雷明兵陈德红李晨
Owner SHANGHAI INST OF ELECTROMECHANICAL ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap