A signal processing method of an x-ray pulse detection system

Abstract

The present invention provides a signal processing method for an X-ray pulse detection system. The method performs high-frequency sampling and quantization on the pulse signal output by the detector, and performs threshold filtering and peak detection to obtain accurate pulse amplitude information. The threshold can be calibrated and tested according to the whole star, and can be adjusted in real time online. This filtering method can effectively reduce the influence of noise on X-ray pulse detection, thereby obtaining accurate amplitude information of the X-ray pulse signal; and the present invention uses a local crystal oscillator to record The local sampling time, and at the same time count the received atomic clock pulses and record the GPS time, the processing module can use the atomic clock pulse counting results to correct the local sampling time, thus solving the clock drift problem of the detector system; thus the processing module can be based on this The output result of the inventive method realizes X-ray pulse signal detection.

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...

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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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