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Frequency domain weighting phase comparison method for X-ray pulsar photon sequences

A photon sequence and frequency domain weighting technology, applied in the field of relative navigation, can solve problems such as reducing the signal-to-noise ratio, overloading the computing unit, and reducing the computing efficiency.

Active Publication Date: 2016-02-03
XIDIAN UNIV
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Problems solved by technology

In fact, in the process of accumulating the pulse signal profile, the signal-to-noise ratio is easily lost due to the smoothing effect; if the photon arrival time series obtained by direct measurement is selected, the data object will be enlarged, giving The computing unit brings overload and reduces computing efficiency

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  • Frequency domain weighting phase comparison method for X-ray pulsar photon sequences
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  • Frequency domain weighting phase comparison method for X-ray pulsar photon sequences

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[0060] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0061] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0062] like figure 1 As shown, the embodiment of the present invention

[0063] S101: Sampling the two photon arrival time sequences received by the two spacecraft at equal intervals to obtain the corresponding photon intensity sequence;

[0064] S102: Transform the two-photon intensity sequence in the time domain into the frequency domain through FFT;

[0065] S103: Extract phase information of the two photon intensity sequences, and perform a difference operation to obtain a phase...

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Abstract

The invention discloses a frequency domain weighting phase comparison method for X-ray pulsar photon sequences and solves the problems that in the prior art, detailed information of a useful signal is lost, calculation complexity is high, and the signal to noise ratio is low. The method comprises the following steps: 1, conducting evenly-spaced sampling on two photon arrival time sequences received by two spacecrafts, and obtaining corresponding photon intensity sequences; 2, converting the two photon intensity sequences in a time domain into a frequency domain through an FFT; 3, extracting phase information of the two photon intensity sequences, conducting subtraction arithmetic, and obtaining phase differences between the two photon intensity sequences; 4, accumulating the phase differences which are sectionalized, and extracting ratios of the phase differences to corresponding frequency points; 5, conducting energy weighting and proportional multiplication on the ratios of the phase differences to frequency in the frequency domain, and obtaining a normalized delay phase within the time domain. By means of the frequency domain weighting phase comparison method, phase estimation accuracy can be effectively improved, calculation complexity can be lowered, and the method can be applied to estimation of the relative movement state of an X-ray pulsar relative to a navigational positioning system.

Description

technical field [0001] The invention belongs to the technical field of relative navigation, in particular to a frequency-domain weighted phase comparison method for X-ray pulsar photon sequences. Background technique [0002] Relative navigation is a key technology for space missions such as autonomous rendezvous and docking, cooperative communication, and formation flight between spacecraft. The relatively mature relative navigation system at this stage needs the assistance and support of ground facilities, and has disadvantages such as weak autonomy, poor anti-interference ability, and not suitable for deep space. The relative navigation system based on X-ray pulsars is a new autonomous navigation method because of its high autonomy, good reliability, and wide applicability. Highly valued and favored by the field. Generally, the pulse arrival time delay is mainly obtained through the delay phase of the pulse signal, and its accuracy directly determines the relative posit...

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Application Information

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IPC IPC(8): G01C21/24
CPCG01C21/24
Inventor 张华许录平张娇孙景荣王光敏黄子杨田斌赵闻博
Owner XIDIAN UNIV
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