| X-ray pulsar navigation (XPNAV) is an X-ray pulsar pulse signal autonomous navigation technology. Because the Earth’s atmosphere blocked to the ground difficult to observe X-ray pulsar signals, and therefore need to be carried out XPNAV flight test flight outside the atmosphere on research support, but the huge cost of space flight test a wide range of technologies involved, is difficult. Therefore, Chinese Academy of Sciences XIOPM on the ground to establish a ground test system, X-ray pulsars pulse signal simulation research on the ground.Since the quantum statistical properties of photons, the need for a large number of photons in order to get information about the cumulative pulse waveform, and then get a pulse time of arrival (TOA). Currently pulse profile cumulative approach is to directly convey photon arrival time data to the host desktop computer system, data acquisition and processing time[8-9]. Photon arrival time data transfer to the computer will need to manually load the data file to the MATLAB data processing program, and then draw from the MATLAB program navigation pulse pulsars profile, and timeliness of this process is greatly affected. Secondly, a desktop computer system heavier, bulky and not conducive to use in the space environment.To solve the problem, we must find a stable, low power consumption, fast data processing, high precision, light weight, small size and data-processing equipment. In view of this, we propose a system with embedded computer hardware and data integration epoch superposition method to achieve a data processing hardware level pulse profile tired cumulative, meaning that a cumulative pulsar pulse profile contour algorithms using MATLAB in basis, with the HDL Coder aided design tools to achieve using FPGA (Field-Programmable Gate Array) hardware system on the photon arrival time data epochs superimposed and pulse profile data integration, whereby the output pulse profile arrival time data.This article describes the photon arrival time data and data integration epoch superposition principle and method of hardware implementation. By MATLAB andMODELSIM achieve functional simulation of the hardware module, quality hardware development board used (XILINX company launched XUP Virtex-II Pro development board) only 650 g, power operation of only 20 W, with 5 V the voltage can work, but the quality of the current desktop computers in kilograms or more, work more than 300 W in power, using 220 V voltage. The device shows the advantage in terms of quality and power consumption. Experimental verification of the reliability of the module, the data processing accuracy, processing speed, etc. The results show that the module is reliable, accurate data processing, processing speed.In order to ground the experimental X-ray pulsar system simulation source Simulation X-rays generated based on the fast stably obtained pulse profile, hardware epoch superposition method to obtain pulse profile. Research on the algorithm implemented in hardware epochs superimposing its data integration, the algorithm first implemented in MATLAB, then the algorithm into a hardware description language, obtained after compiling the hardware configuration of the Bit file, and ultimately the development board data processing hardware module. Photons over time reaches the time pulse profile data obtained by the data error exists MATLAB algorithm and hardware modules via the data results obtained after the treatment, the maximum error in a single time window of two photons, the statistical error of the mean number of photons representing 0.084%average; two sets of statistical data in different data pulse profiles 9.481%of the total number of data, so that the error does not affect the back-end analog navigation module navigation. Implemented in hardware epochs superimposing its data integration module deals with fast, compact equipment, low power consumption, provide a viable data processing hardware technical support spacecraft utilizing X-ray pulsar navigation. |
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