X-ray pulse detection system signal processing method

Abstract

The invention provides an X-ray pulse detection system signal processing method. The method performs high-frequency sampling and quantification of a pulse signal output by a detector, and performs threshold filtering and peak value detection so as to obtain accurate pulse amplitude information, wherein a threshold value in the threshold filtering can be tested according to star calibration and can be adjusted online in real time. The filtering method may effectively reduce an influence of noise on X-ray pulse detection so as to obtain accurate amplitude information of an X-ray pulse signal. Further, a local crystal oscillator records local sampling time, counts received atomic clock pulses, and records GPS time. A processing module may correct the local sampling time by using the counted atomic clock pulses so as to solve a problem of clock drifting of a detection system. As a result, the processing module may achieve X-ray pulse signal detection according to a result output by the method.

Description

technical field [0001] The invention belongs to the technical fields of aerospace deep space exploration and X-ray detection, and in particular relates to a signal processing method of an X-ray pulse detection system. Background technique [0002] In the field of deep space exploration, the X-rays emitted by neutron stars serve as a stable benchmark and can be used as a navigation reference, and the spectral energy after reaching low-Earth orbit is only on the order of single photons. In order to reconstruct the pulsar waveform, the precise arrival time and amplitude of each photon are required. [0003] The current X-ray pulse detection adopts the system architecture of a comparator plus a counter. This system can only obtain pulse time information, but cannot obtain amplitude information, and the time accuracy is determined by the pulse jump edge triggering the comparator. Pulses of different intensities are triggered The difference in time causes a large error in the sys...

AI Technical Summary

Problems solved by technology

[0003] The current X-ray pulse detection adopts the system architecture of a comparator plus a counter. This system can only obtain pulse time information, but cannot obtain amplitude information, and the time accuracy is determined by the pulse jump edge triggering the comparator. Pulses of different intensities are triggered Different times cause a large error in the system time

At the same time, using the comparator method, the threshold value of the digital filter is fixed, which cannot be adjusted on the satellite, and the system accuracy is reduced due to noise

When eliminating clock drift, the atomic clock is usually used to reset the local clock every second. Due to the asynchronous clock, there will be errors every time in this reset, and the errors will gradually accumulate, which is also the reason for the low accuracy of system time detection.

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