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Orbit dynamics-assisted dynamic pulsar signal processing method

A pulsar and dynamic technology, applied in the field of navigation, can solve problems such as the calculation of the arrival time of the pulse or the initial phase of the pulse, and the periodic variation of the pulsar signal, which is easy to promote and use, and has strong operability. Effect

Active Publication Date: 2018-06-12
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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Embodiment Construction

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

[0034] In a specific application example, the adopted spacecraft is a near-Earth spacecraft.

[0035] like figure 1 As shown, the concrete steps of the present invention are as follows:

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

[0037] According to the analysis of the literature (Emadzadeh, A.A., Speyer, J.L.. Navigation in Space by X-ray Pulsars [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 spacecraft and pulsar (Sheikh, S.I. The Use of VariableCelestial X-Ray Sources for Spacecraft Navigation [D]. Maryland: University...

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Abstract

The present invention discloses an orbit dynamics assisted dynamic pulsar signal processing method, which comprises: calculating the pulsar estimation phase at a time ti according to the rotating frequency and the direction vector of the pulsar, the estimation position of a spacecraft relative to the earth at the time ti, and the position of the earth at the time ti; after setting the order K of the frequency coefficient as 2, calculating the spacecraft detection phase at the time ti according to the phase of photons received by the spacecraft and the pulsar estimation phase at the time ti; according to the pulsar flow rate, the noise flow rate and the number of the photons received within the observation period, calculating to obtain an initial phase; and according to the initial phase, the earth velocity at the time t0 and the estimation velocity of the spacecraft relative to the earth, calculating the pulse arriving time at the time t0. According to the present invention, the method is provided under the premise of consideration of the orbit motion of the spacecraft, the operability is strong, and the practicality is provided.

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 flight 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. X-ray pulsars are high-speed spinning neutron stars with excellent long-period stability and can radiate 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 benchmark for spacecraft navigation. [0003] Although the pulsar's signal is considered to be pulsar, the spacecraft can only receive a sequence of photon arrival times (Time of Arrival, TOA) due to the extremely weak flow of the pulsar. How to extract the pulse arrival time from the photon TOA is a key technology for pulsar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02G01C21/20
CPCG01C21/025G01C21/20
Inventor 郑伟王奕迪汤国建张大鹏
Owner NAT UNIV OF DEFENSE TECH
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