Unlock instant, AI-driven research and patent intelligence for your innovation.

Continuous Location Method of Scanning Radiation Source Based on Maximum Likelihood

A positioning method and maximum likelihood technology, applied in the field of continuous positioning of scanning radiation sources based on maximum likelihood, can solve the problems of decreased positioning accuracy and limited application environment

Active Publication Date: 2019-09-24
NAVAL AVIATION UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the situation where the scanning rate of the radiation source is unknown, the current scanning radiation source localization algorithm generally first obtains the initial value estimation of the scanning rate through a rough grid search method, and then uses the measurement information at a single moment to jointly estimate the scanning rate and the target state Further refinement, although this method can achieve better estimation results, when the measurement noise is large, its positioning accuracy drops significantly, which limits its application environment

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
  • Continuous Location Method of Scanning Radiation Source Based on Maximum Likelihood
  • Continuous Location Method of Scanning Radiation Source Based on Maximum Likelihood
  • Continuous Location Method of Scanning Radiation Source Based on Maximum Likelihood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0068] The present invention will be described in further detail below in conjunction with the accompanying drawings. Refer to the attached figure 1 , the continuous positioning method of scanning radiation source target in the present invention is divided into the following several steps:

[0069] Step 1: Obtain an initial estimate of the scan rate through a rough grid search method.

[0070] order w j =j·Δw(j=1,2,…,m), where Δw is the grid size, and Corresponding azimuth measurements are available

[0071] beta i,j (k)=w j ·τ i (k)(i=1,2,...,n-1)

[0072] Then use the instantaneous positioning method based on azimuth measurement to obtain the estimation of the target state Will into the measurement equation to calculate Will into the likelihood function p(τ(k)|w,u(k)), and select w that maximizes the likelihood function j As an estimated initial value of the scan rate w 0 .

[0073] Step 2: Project the measurement information of different observation stati...

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 belongs to a multi-sensor passive positioning technology, and provides a novel method for continuously positioning a scanning system radar radiation source under the condition of an unknown scanning rate. The method comprises the following steps: in the consideration that the scanning rate can be regarded as an unchangeable constant, projecting measured information at all the moments to a target state space to obtain an estimated scanning rate value; then performing recursive optimization in the maximum gradient direction until convergence occurs, and finally calculating maximum likelihood estimation of a target state. The method can effectively estimate the scanning rate of a radiation source target and state information thereof, and the estimation accuracy of a target position is improved.

Description

technical field [0001] The invention belongs to the multi-sensor passive positioning technology, relates to the problem of continuous positioning of radiation sources in a scanning system, and provides a new method for continuous positioning of scanning radiation sources based on maximum likelihood. Background technique [0002] Passive positioning technology has always been an important research topic in the field of signal processing. It has the advantages of good concealment, long detection distance, and strong applicability. It has attracted extensive attention from domestic and foreign scholars in the fields of radar and wireless sensor networks. At present, the measurement information mainly used includes azimuth, time difference of arrival, frequency difference of arrival, and gain ratio of arrival, etc., or a variety of joint positioning systems obtained by combining the above measurements. [0003] The traditional azimuth-based radiation source positioning method ne...

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 Patents(China)
IPC IPC(8): G01S5/06
Inventor 孙顺董凯刘瑜刘俊齐林潘新龙郭晨王智
Owner NAVAL AVIATION UNIV