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

A Fast Calculation Method of Arrival Time of Impulse Signals Based on Partition Search

A time-of-arrival and pulse signal technology, applied in the field of spacecraft navigation, can solve problems such as the lengthy calculation process of pulse signal arrival time and affect the response speed of spacecraft navigation, etc., to save calculation costs, improve reliability and real-time performance, and improve response speed effect

Active Publication Date: 2017-05-24
NAT UNIV OF DEFENSE TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fast calculation method of pulse signal arrival time based on partition search, so as to solve the technical problem that the calculation process of pulse signal arrival time is too long, so as to affect the response speed of spacecraft navigation

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
  • A Fast Calculation Method of Arrival Time of Impulse Signals Based on Partition Search
  • A Fast Calculation Method of Arrival Time of Impulse Signals Based on Partition Search
  • A Fast Calculation Method of Arrival Time of Impulse Signals Based on Partition Search

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered by the claims.

[0028] see figure 1 , figure 2 ,Such as figure 1 Shown, concrete steps of the present invention are as follows:

[0029] (1) with h Origin The step size of the phase builds the likelihood function LF Origin .

[0030] The photons arriving at the spacecraft obey the non-homogeneous Poisson distribution, in [t 0 t 1 ], the probability that I photons arrive is

[0031]

[0032] Among them, λ(t)>0 is the photon velocity function of the pulsar signal.

[0033] The expression of λ(t) is:

[0034] λ(t)=αh(φ det (t))+β (2)

[0035] In formula (2), α is the pulsar flow rate, β is the noise flow rate, h( ) is the profile function of the pulsar, φ det (t) is the phase of the detected pulsar signal at time t.

[0036] Regardless of the spacecraft moti...

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 provides a method for quickly calculating arrival time of a pulse signal based on sector search. The method comprises the steps that firstly, a unimodal section is searched for after a likelihood function is established according to the step size of an initial phase; secondly, a unimodal section is searched for after a likelihood function is established according to the half of the step size of the initial phase, and if the results of the two times of search are the same, the maximum value and the minimum value of the likelihood function in each unimodal section and corresponding phases are searched for, and the phase corresponding to the maximum value is the phase corresponding to the arrival time of the pulse signal of a pulsar; finally, the pulse arrival time is obtained according to the product of the phase and the period of the pulsar signal. Compared with a grid search method, the method has the advantages that by means of the strategy of distinguishing the unimodal sections and solving the maximum values and the minimum values of the likelihood functions of the unimodal sections, the calculated amount is effectively reduced, the calculation cost is saved, and the navigation reaction speed of a spacecraft is increased.

Description

technical field [0001] The invention relates to the field of spacecraft navigation, in particular to a fast calculation method for processing pulse arrival time of pulsar signals based on partition search, which is suitable for X-ray pulsar navigation tasks of different missions. Background technique [0002] X-ray pulsar navigation is an emerging method of astronomical navigation. Compared with traditional astronomical navigation methods, X-ray pulsar navigation can provide a good external reference time and frequency benchmark. Compared with satellite navigation systems such as GPS (Global Positioning System), X-ray pulsar navigation is not limited to near-earth space, and can serve deep space probes. Compared with other bands, X-ray pulsars have obvious characteristics in the X-ray frequency band, which can avoid the interference of various signals in space. The size and power consumption of the detector can be reduced under the premise of satisfying the flow rate and 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
Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/20
CPCG01C21/20G01C21/24
Inventor 郑伟王奕迪汤国建张大鹏
Owner NAT UNIV OF DEFENSE TECH
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