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X-ray pulsar recognition method based on Hilbert transformation

An identification method and X-ray technology, applied in astronomical navigation and other directions, can solve problems such as a large amount of computing time and storage space, and achieve the effect of less computing space and storage space, effective identification effect, and suppression of high-frequency noise.

Inactive Publication Date: 2018-04-10
HARBIN INST OF TECH
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Problems solved by technology

[0004] At present, the conventional method for identifying the X-ray pulsar observation profile signal is to use the amplitude information of the observation profile to compare with the standard profile, which is greatly affected by noise. method, requires a lot of computing time and storage space

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  • X-ray pulsar recognition method based on Hilbert transformation
  • X-ray pulsar recognition method based on Hilbert transformation
  • X-ray pulsar recognition method based on Hilbert transformation

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[0020] The specific implementation manner of the present invention will be described below in conjunction with the examples and accompanying drawings.

[0021] Execution step 1: First, incorporate the standard profile data of 11 observed X-ray pulsars provided by EPN into the navigation database. Therefore, the collection of observed X-ray pulsars is: {B1257+12, B1953+29, J0621+1002, J1012+5307, J1518+4904, J1640+2224, J1643-1224, J1713+0747, J1730-2304, J1744- 24A, J2051-0827}, attribute the samples of this set to the classes numbered {1,...,11} respectively.

[0022] Step 2: Extract the instantaneous amplitude feature vector of the observed contour signal, and use the minimum distance classifier to calculate the distance between it and each standard contour feature vector to obtain a set of identification space distances.

[0023] Step 3: Select the X-ray pulsar serial number corresponding to the minimum value in the set as the identification result.

[0024] Table 1 Calcu...

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Abstract

The invention provides an X-ray pulsar recognition method based on Hilbert transformation, belongs to the field of weak signal processing, and relates to a profile recognition method. The X-ray pulsarrecognition method solves the problem that during current recognition, a large amount of operating time and storage space are occupied, and meanwhile, the influence of high frequency noise can be effectively inhibited. The method comprises the steps of 1, conducting Hilbert transformation on a standard profile and an observation profile signal; 2, extracting instantaneous amplitude characteristics of a standard profile signal and a profile signal to be recognized and utilizing a characteristic vector of the standard profile to construct a characteristic database; 3, calculating the spatial distances of characteristic vectors of the observed profile signal and all characteristic vectors in the characteristic database respectively, wherein when the distance is the minimum, the corresponding pulsar sequence is a recognition result. Inhibiting properties of the high frequency noise by the Hilbert transformation are utilized, instantaneous amplitude characteristics are extracted to designa minimum distance classifier to complete high speed recognition of a pulsar signal, and the X-ray pulsar recognition method is applicable to quickly recognizing an X-ray pulsar.

Description

technical field [0001] The invention relates to a contour identification method in the field of weak signal processing, in particular to an X-ray pulsar identification method based on Hilbert transform. Background technique [0002] X-ray pulsars are a type of neutron star whose radiation photon energy is concentrated in the X-ray frequency band, has a stable rotation period, and is far away from the solar system. X-ray pulsar navigation is free from human interference and can realize completely autonomous navigation. At the same time, X-ray pulsar navigation can solve the navigation problem of large-scale space-time. [0003] X-ray pulsars are far away from the solar system, and the photons propagating to the spacecraft are easily overwhelmed by the background noise of the universe, and the photon signals that can be received are very weak. The photons are folded according to a certain period to obtain the observation profile. After the contour extraction of the X-ray pul...

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Application Information

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IPC IPC(8): G01C21/02
CPCG01C21/02
Inventor 金晶王龙奇姜宇李晓宇
Owner HARBIN INST OF TECH
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