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Orbit dynamics-assisted dynamic pulsar signal processing method

A processing method and pulsar technology, applied in the field of navigation, can solve the problems of not considering the periodic variation of the pulsar signal, not involving the calculation of the arrival time of the pulse or the initial phase of the pulse, etc. Effect

Active Publication Date: 2018-03-13
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, this method does not take into account the periodic changes of the pulsar signal caused by the orbital motion of the spacecraft, and the problem discussed is relatively simple, and does not involve the calculation of the specific pulse arrival time or pulse initial phase
Document 2 (Liu Jin, Zeng Xianwu, Fang Jiancheng, Ning Xiaolin. Pulsar Pulse Arrival Time Compensation Based on Starlight Doppler[J]. 2014,42(1):129-132.) Improved the method proposed in Document 1 , but this method also does not consider the period change of the pulsar signal caused by the orbital motion, and only regards the orbital effect as the cumulative effect on the pulse arrival time
In addition, the methods proposed in Document 1 and Document 2 achieve their goals by introducing auxiliary information from other navigation facilities, and do not fundamentally solve the problem of dynamic signal solution for individual pulsar navigation

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  • Orbit dynamics-assisted dynamic pulsar signal processing method
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  • Orbit dynamics-assisted dynamic pulsar signal processing method

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] In a specific application example, the spacecraft used is a deep space probe.

[0035] Such as figure 1 Shown, concrete steps of the present invention are as follows:

[0036] (1) calculate t according to formula (1) i Estimated phase φ at time pre (t i ).

[0037] According to the analysis of literature (Emadzadeh, A.A., Speyer, J.L..Navigation in Space by X-rayPulsars[M]. Spring Press, 2011.), during the observation period (t 0 t f ), t i The spacecraft detection phase at time is

[0038]

[0039] Among them, v(τ) is the projected velocity of the spacecraft in the direction of the pulsar at time τ.

[0040] According to the geometric configuration relationship between the spacecraft and the pulsar (Sheikh, S.I. The Use of Variable Celestial X-Ray Sources for Spacecraft Navigation [D]. Maryland: University of Mary...

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Abstract

The invention discloses a method for processing a dynamic pulsar signal under assistance of orbit dynamics. The method comprises steps as follows: the estimated phase position of the pulsar at the moment of ti is calculated according to the rotation frequency and the direction vector of the pulsar and the estimated position of a spacecraft relative to the sun at the moment of ti; after the order K of coefficients of frequency is set to be 1, the detection phase position of the spacecraft at the moment of ti is calculated according to the photon phase position received by the spacecraft and the estimated phase position of the pulsar at the moment of ti; an initial phase is obtained through calculation of the flow rate of the pulsar, the noise flow rate and the number of photons received in the observation period; TOA (Time Of Arrival) of pulses at the moment of t0 is calculated according to the initial phase and the estimated speed of the spacecraft relative to the sun. The method is proposed on the premise that orbital motion of the spacecraft is considered, has high operability is high and is practical.

Description

technical field [0001] The invention relates to the field of navigation methods, in particular to a method for processing dynamic pulsar signals, which is suitable for X-ray pulsar navigation tasks of different missions. Background technique [0002] X-ray pulsar navigation is an emerging astronomical navigation method, which has the characteristics of high precision and wide application range. An X-ray pulsar is a high-speed spinning neutron star with excellent long-term stability and can emit X-ray pulse signals. Further processing of the pulse signal can obtain the position of the spacecraft relative to the pulsar, which can be used as a reference for spacecraft navigation. [0003] Although the pulsar signal is considered to be pulse-type, due to the extremely weak flux of the pulsar, the spacecraft can only receive a sequence of photon arrival time (Time of Arrival, TOA). How to extract the pulse arrival time from the photon TOA is a key technology for pulsar navigati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 郑伟王奕迪汤国建张大鹏
Owner NAT UNIV OF DEFENSE TECH
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