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

Virtual aperture expansion related interferometer direction finding method

A correlative interferometer and virtual aperture technology, applied in the field of direction finding in spectrum management, can solve the problems of limited direction finding performance at low frequency, achieve good practical value, be easy to promote and use, and improve the effect of direction finding performance

Active Publication Date: 2019-04-05
中国电波传播研究所
View PDF10 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a correlative interferometer direction finding method with virtual aperture expansion that can solve the problem of limited performance of direction finding at low frequency in the existing correlative interferometer direction finding technology

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
  • Virtual aperture expansion related interferometer direction finding method
  • Virtual aperture expansion related interferometer direction finding method
  • Virtual aperture expansion related interferometer direction finding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In Embodiment 1, it is assumed that the basic configuration of a direction finding device is as follows:

[0035] Assume that the DF antenna has nine antenna elements (numbered 0, 1, ..., 8), where the 0th element is the reference antenna element;

[0036] Assume that the receiver has two receiving channels, one of which is connected to the reference antenna unit, and the other antenna unit is connected through the antenna selection switch;

[0037] Assume that the number of continuous sampling points is 4096;

[0038] Such as figure 1 As shown, the related interferometer direction finding method for virtual aperture expansion disclosed in this embodiment includes the following steps:

[0039] Step 1. Using a dual-channel direction-finding receiver to record the simultaneously collected IQ signals;

[0040] Step 2, calculating the second-order statistic complex-valued phase difference and the fourth-order statistic complex-valued phase difference between the referenc...

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 present invention discloses a virtual aperture expansion related interferometer direction finding method. The method comprises the following steps: (1) recording simultaneously acquired IQ signalsby using a dual channel or multi-channel direction finding receiver; (2) calculating a second-order statistic complex value phase difference and fourth-order statistic complex value phase differencebetween the IQ signals collected by a reference antenna unit and other antenna units excluding the reference antenna unit, and combining the differences into a measurement vector; (3) reading a direction finding database of a corresponding frequency point, and calculating an expansion direction finding database; and (4) performing correlation calculation on the measurement vector in (2) and the expansion direction finding database in (3), and taking the maximum correlation value as the estimated value of the direction. According to the virtual aperture expansion related interferometer direction finding method disclosed by the present invention, based on the second-order and fourth-order statistical information of the IQ signals collected by the direction finding receiver, the virtual aperture expansion of the direction finding antenna is realized, and the direction finding performance of the related interferometer direction finding device at the low end of the frequency is improved.

Description

technical field [0001] The invention belongs to the technical field of direction finding in spectrum management, and in particular relates to a method for measuring direction of a correlation interferometer with virtual aperture expansion in the field. Background technique [0002] The direction finding of radiation sources is one of the common tasks in the field of spectrum management, which is usually implemented by direction finding antennas and receivers in fixed monitoring stations or mobile monitoring stations (mainly vehicle-mounted). [0003] The current direction finding technology system is mainly the Watson-Watt method and the related interferometer method. The Watson-Watt method is mainly suitable for the low end of the HF frequency band and the VHF frequency band, and its direction finding accuracy is limited by the out-of-roundness of the antenna unit's pattern. , and is sensitive to factors such as radio wave reflection effects and equipment errors; the correl...

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): G01S3/14G01S3/46
CPCG01S3/143G01S3/46
Inventor 苟晓鸣郭兰图武者东唐聪
Owner 中国电波传播研究所
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