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Phase Estimation Method of X-ray Pulsar Based on Loop Tracking

A loop tracking and phase estimation technology, applied in astronomical navigation and other directions, can solve the problem of estimation accuracy degradation, and achieve the effect of improving accuracy, improving measurement accuracy, and ensuring correctness

Active Publication Date: 2017-04-05
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is: to overcome the estimation accuracy degradation caused by using a fixed standard pulse profile to realize pulse phase estimation in the existing pulsar navigation signal processing link, and to provide a dynamic A Method for Accurate Estimation of Spacecraft Pulse Phase

Method used

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  • Phase Estimation Method of X-ray Pulsar Based on Loop Tracking
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  • Phase Estimation Method of X-ray Pulsar Based on Loop Tracking

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Embodiment

[0049] Step 1: Determine the observed pulsar and record its pulse period P under static conditions 0 with the standard profile s(n). In this example, the observed pulsar is PSR B0531+21, and its pulse period under static conditions is P 0 = 33.085ms. The observation starting point is τ 0 =55746.0MJD, processing step τ s =1s, observation time length τ obs = 2s. The arrival time of all photons is collected in the observation period, denoted as τ k (k=1,2,3,...). The total number of sampling points N=1024.

[0050] Step 2: For the first group of photon arrival time series τ k ∈[0s,1s], the folding is performed according to the pulse period P0 under static conditions, and the folding reference point is taken as 0.5s. First define the measurement pulse profile c(n)=0, (n=1,2,...,1024), if the arrival time of the kth photon satisfies:

[0051]

[0052] Where {} means rounding up, it is considered that the photon arrival time corresponds to the nth time grid of the foldi...

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Abstract

The invention discloses a method for estimating the X-ray pulsar phase based on loop circuit tracking. The method comprises the following steps: (1) a pulsar is determined and observed, and the pulse period P0 and the standard outline s(n) of the pulsar under the static condition are recorded; (2) within the observation time quantum, the arrival time of all the observed pulsar quantum photons is recorded; (3) the quantum photon arrival time series within the first tau s duration are superimposed to generate a measured pulse outline c(n) according to the pulse period P0 under the static condition; (4) the phase difference estimated value phi- of s(n) and c(n) is evaluated; (5) a one-order filter and a three-order filter are selected and combined to perform filtration on the phase difference estimated value phi- to obtain the frequency and phase feedback update information delta f and delta phi; (6) the delta f is utilized to correct the pulse period P0 under the static condition to obtain the corrected pulse period P- and obtain a new measured pulse outline c-(n) within the next tau s duration; (7) the delta phi is utilized to correct the standard outline s(n) to obtain the corrected standard pulse outline s-(n); (8) according to the s-(n) and the c-(n), the new phase difference estimated value phi-^ is obtained.

Description

technical field [0001] The invention belongs to the field of autonomous navigation of spacecraft, and relates to a method for correcting dynamic effects of an X-ray pulsar navigation signal processing process, which is suitable for low-earth orbit, deep space and interplanetary flight spacecraft, as well as non-dense atmosphere star landers and their methods. High-precision autonomous navigation and control of surface rovers. Background technique [0002] X-ray pulsars are natural beacons that emit steady pulses of X-rays. Utilizing X-ray pulsar navigation is a new type of astronomical navigation method, and it is truly autonomous navigation. Through the timing observation of pulse signals, high-precision ranging information and time information can be obtained, and attitude information can also be obtained by imaging pulsars. Pulsar navigation is an autonomous navigation technology applicable to the entire solar system. For different stages of the mission, only the adapti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02
CPCG01C21/02
Inventor 张新源帅平黄良伟林晴晴贝晓敏
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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