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

Single-station passive positioning method and device based on extended Kalman filtering

An extended Kalman and passive positioning technology, applied in the field of extended Kalman filtering to locate and track targets, can solve the problems of difficult implementation, large angle information and hardware cost, etc., achieve high utilization rate, reduce hardware cost, and reduce cost Effect

Pending Publication Date: 2019-11-19
TIANJIN UNIV
View PDF14 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical problems, the positioning accuracy of moving targets is sensitive to the influence of the angle of arrival, so the extraction of angle information requires a large hardware cost. For the positioning scene with the help of external radiation sources, although the positioning accuracy is high, various problems will occur in actual operation. problem, making it difficult to implement

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
  • Single-station passive positioning method and device based on extended Kalman filtering
  • Single-station passive positioning method and device based on extended Kalman filtering
  • Single-station passive positioning method and device based on extended Kalman filtering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The algorithm flow process that the present invention proposes is as follows:

[0051] 101: Receive incoming signals through receiving device 1 and receiving device 2, perform N-point DFT with Hanning window on the 2-way undersampled signal sample sequence, perform spectrum correction and mode clustering on the DFT results, and apply the Chinese remainder theorem to obtain wave frequency estimation;

[0052] 102: Due to the Doppler effect of the target movement, the receiving frequencies of the two receiving stations are measured at the two measurement moments, and the difference between the four frequency measurement results is obtained. The four frequency differences of the sites;

[0053]

[0054] in, for t 1 The frequency difference between two receiving stations at any time, Δf t2 for t 2 The frequency difference between two receiving stations at any time, Δf 1 is the frequency difference received by receiving station 1 at two moments, Δf 2 is the freque...

Embodiment 2

[0057] 1. Passive monostatic positioning model

[0058] For the passive positioning of moving targets, the embodiment of the present invention adopts figure 1 The model shown is analyzed. Arrange two sets of receiving devices in the receiving area, the distance is d 1 ; assume t 1 to t 2 At time , the target flies over the receiving area at a constant speed v. at t 1 At time, the space distance between the target and the receiving station is r 1 (Because the distance between the target and the receiving device is far greater than the distance between the adjacent receiving devices, the distances from the target to the two receivers can be approximately regarded as equal), similarly, at t 2 At time, the space distance between the target and the receiving station is r 2 . Establish the relationship between the frequency difference measured by the two stations at the same time and the frequency difference measured by the same station at different times and the position of...

Embodiment 3

[0119] This method uses Relative Range Error (RRE) as an evaluation index to describe the tracking performance of the algorithm, which is defined as:

[0120]

[0121] Assuming that receiving device 1 is the origin of the coordinates, the distance between receiving device 2 and receiving device 1 is 15 meters, and the target radiation source moves from (2000, 500000) m at a uniform velocity with acceleration disturbance of (300, 400) m / s, so the target The initial state is set to (2000,500000,2300,500400)m. The observation period is 1s, and the observation time lasts 100s, and it is assumed that the frequency of the radiation source remains constant at 3GHz during the observation time. Given the accuracy of the Doppler frequency difference between two sets of observations:

[0122]

[0123]

[0124] The initial covariance of the experiment is set to P 0 =diag[900,10 -4 ,900,10 -4 ], the experiment carried out 100 Monte-Carlo simulations, and the results are as fol...

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 single-station passive positioning method and device based on extended Kalman filtering. The method includes the following steps: separately receiving incoming wave signals through two receiving devices, performing DFT of N-point plus Hanning window on a sample sequence of 2-way incoming wave undersampling signal, performing spectrum correction and pattern clustering on aDFT result, and obtaining incoming wave frequency estimation by applying a Chinese remainder theorem; separately measuring the receiving frequency of two receiving stations at two measurement moments, and making a difference between four frequency measurement results in pairs to obtain four frequency differences of the same station at two receiving moments and two stations at the same moment; andutilizing the four frequency differences as observed quantity, constructing a Kalman filtering model by utilizing target positions of two moments as state quantity, eliminating non-linear interference by the model, and completing positioning and tracking of a target. The device includes: an analog-to-digital converter and a DSP device.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a method and a device for locating and tracking a target by applying an extended Kalman filter according to the Doppler effect under the condition of passive reception. Background technique [0002] With the development of electronic information technology, electronic warfare, as an integral part of modern high-tech warfare, has been paid more and more attention in the strategic field. In the field of military struggle, an important issue is the positioning of non-own targets. The positioning problem can be divided into active positioning and passive positioning according to whether it actively transmits detection pulses; it can also be divided into single-station positioning and multi-station joint positioning according to the number of receiving stations. [0003] Active positioning is to use active equipment such as radar, laser, and sonar to locate the targ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0294Y02D30/70
Inventor 黄翔东杨琳
Owner TIANJIN UNIV
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