A Pulsar Photon Timing Method Based on APD Detector

A technology of pulsars and detectors, applied in the fields of aerospace, information remote sensing, and deep space exploration and navigation, can solve the problems of less research on pulsar photon timing, and achieve the effects of eliminating amplitude wandering effects, suppressing noise, and fast response time

Active Publication Date: 2019-04-26
SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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  • Application Information

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Problems solved by technology

As a new type of navigation technology, pulsar navigation has few domestic and foreign reports on the research of pulsar photon timing.

Method used

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  • A Pulsar Photon Timing Method Based on APD Detector
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  • A Pulsar Photon Timing Method Based on APD Detector

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Embodiment Construction

[0039] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0040] A pulsar photon timing method based on APD detector, the main working principle is as follows figure 1 shown, including:

[0041] (1) APD detector: through the principle of avalanche amplification, the incident X-ray fluorescence is converted into a weak electrical signal through the photoelectric effect.

[0042] (2) Signal extraction module: including pre-amplification, shaping filter and other circuits, which convert the weak signal output by APD into a pulse signal that can be used for timing;

[0043] (3) Constant ratio timing module: Constant ratio timing and single threshold triggering are used to ensure effective signal acquisition and eliminate amplitude wandering caused by photons of different energies;

[0044] (4) Clock holding module: use a miniature atomic clock, combined with GPS second pulse, output high stable clock frequency to F...

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Abstract

The invention discloses a pulsar photon timing method based on an APD detector. An APD is used for realizing detection on weak pulsar photons of 0.5keV to 10keV. On one hand, the pulsar photon timing method has the advantages of high detection efficiency, rapid response time, high energy resolution and the like; on the other hand, photon-generated carriers in the detector are drifted along a pn junction direction; time jitter caused by the detector is relatively small, so that the pulsar photon timing method is very suitable for pulsar photon timing; a constant-ratio timing and single threshold value triggering method is adopted, so that noises are inhibited, and furthermore, an amplitude movement effect caused by different X photon energy is eliminated; advantages that a GPS (Global Positioning System) second pulse signal is long and stable and an atomic clock is short and stable are combined, and long and stable and high-precision clock frequency is output through a correction principle; TDC (Time-Digital Convert) timing precision is kept; furthermore, pulsar photon timing errors are reduced.

Description

technical field [0001] The invention belongs to the technical fields of deep space exploration and navigation, aerospace, information remote sensing, etc., and in particular relates to a pulsar photon timing method based on an APD detector. Background technique [0002] Pulsar navigation is an autonomous navigation method that relies on the natural clock of pulsars. It does not depend on the support of ground stations at all. It uses the detection of pulsar X-ray band pulses in the universe to realize the timing, attitude determination, and positioning of spacecraft, and then Complete the autonomous navigation of the spacecraft. The basic principle of X-ray pulsar navigation is: to measure the phase of the pulsar pulse when it reaches the spacecraft, and to make up the phase difference of the pulse relative to the center of mass of the solar system. The difference is a function of the position of the spacecraft and the position of the pulsar. The position of the spacecraft ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04F13/00
CPCG04F13/00
Inventor 金东东陈二雷胡慧君王文丛裴崇雷袁鹏万胜伟李文彬
Owner SHANDONG INST OF AEROSPACE ELECTRONICS TECH
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