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Method for quickly calculating arrival time of pulse signal based on sector search

A technology of arrival time and pulse signal, which is applied in the field of spacecraft navigation, can solve the problems affecting the response speed of spacecraft navigation and the lengthy calculation process of pulse signal arrival time, so as to save computing costs, improve reliability and real-time performance, and be easy to popularize. and the effect of using

Active Publication Date: 2015-04-22
NAT UNIV OF DEFENSE TECH
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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

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  • Method for quickly calculating arrival time of pulse signal based on sector search
  • Method for quickly calculating arrival time of pulse signal based on sector search
  • Method for quickly calculating arrival time of pulse signal based on sector search

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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 ,like 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] Pr [ K ; t 0 t 1 ] = ( ∫ t ...

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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...

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Application Information

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Patent Type & Authority Applications(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
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