Time-delay measurement method for pulsar cumulative pulse profile using sparse representation

A technique of accumulating pulses and time delays, which is applied in the field of signal processing, can solve problems such as inability to achieve sparse representation effects, poor sparse representation effects, etc., achieve high accumulative pulse profile time delay measurement accuracy, small amount of calculation, and improve navigation accuracy Effect
CN103217162BInactive Publication Date: 2015-11-11XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2015-11-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an accumulated pulse profile time delay measurement method by sparse representation, and aims to mainly solve the problem that the sampling frequency and signal to noise ratio of pulse profiles can affect measurement accuracy in the prior art. The method is realized by the steps of: (1) conducting standard pulse profile sampling, and constructing a waveform matching redundant dictionary; (2) employing a greedy optimization algorithm to calculate a first-order sparse coefficient vector of the measurement pulse profile under the waveform matching redundant dictionary; and (3) according to the column corresponding to the only nonzero element in the first-order sparse coefficient vector, calculating the accumulated pulse profile time delay. Compared with the prior art, the method provided in the invention significantly reduces computation, improves the measurement precision of time delay, shortens the pulse profile accumulation time, and can be used for measurement of the time difference of arrival (TDOA) of the pulse from a spacecraft to a solar system barycenter.
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Description

technical field

[0001] The invention belongs to the technical field of signal processing, and relates to a method for measuring the time delay of pulsar cumulative pulse contours, which can be used for X-ray pulsar navigation. Background technique

[0002] X-ray pulsar navigation can provide accurate position, velocity, attitude time and other navigation information for low-earth orbit satellites, interstellar spacecraft and deep space probes, and is not easy to be interfered, so it has broad application prospects and value.

[0003] The basic observation of the X-ray pulsar navigation system is the time difference of arrival (TDOA) of pulsar cumulative pulses from the spacecraft to the center of mass of the solar system. In addition to the resolution of the X-ray detector and the accuracy of the time conversion model, the time delay of the measured pulse profile relative to the standard pulse profile, that is, the time delay of the accumulated pulse profile is a key factor ...

Claims

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