Pulsar dispersion elimination device and method

Abstract

The invention provides a pulsar dispersion elimination method, which comprises a switchable search mode and a switchable folding mode, and comprises the following steps of: obtaining multi-channel data by adopting an FFT (Fast Fourier Transform) parallel computing module, initializing related variables according to parameters of the multi-channel data, carrying out task decomposition, and calculating dispersion quantity translation; allocating a GPU memory, and translating and copying the dispersion quantity into the GPU memory; and calling a kernel function of the GPU by adopting the CPU, handing over the calculation task to the GPU for dispersion elimination processing, and copying a dispersion elimination processing result to a CPU memory until the dispersion elimination processing is finished. The invention further provides a pulsar dispersion elimination device. According to the method, the pulsar dispersion elimination calculation performance is greatly improved, the processing speed is increased, the real-time dispersion elimination processing requirement of mass data is met, meanwhile, the data storage amount is reduced, and the system cost is reduced.

Description

technical field [0001] The invention belongs to the field of astronomical observation, and relates to a pulsar dispersion elimination device and method. Background technique [0002] A pulsar is a neutron star that rotates rapidly and generates a magnetic field. It has a very high density and a stable period. While it rotates around its own rotation axis at a high speed, electromagnetic waves are emitted outward along the direction of the magnetic pole. When the electromagnetic wave sweeps across the earth, the earth The radio telescope on board will receive periodic pulse signals. [0003] When the pulsar signal propagates in the universe, the speed will be reduced due to the influence of the dispersion of the interstellar medium. The propagation speed of the high-frequency radio wave is faster than that of the low-frequency, so there is a certain delay in the arrival of the high-frequency and low-frequency radio telescopes. Therefore, the pulsar signal Distortion of the p...

AI Technical Summary

Problems solved by technology

[0005] (1) The improvement of the performance of observation equipment has rapidly expanded the frequency range of observable celestial body signals in radio astronomy. Technology cannot process massive amounts of data quickly and in real time

For example, the amount of data generated by cutting-edge observation equipment such as ultra-wideband receivers, multi-beam receivers, and PAF receivers is very large, usually in the order of TB. an unprecedented challenge

[0006] (2) When the pulsar dispersion measure (DM) search space is large, the existing dispersive processing method has relatively low computational efficiency, huge amount of calculation, and longer time-consuming, which cannot satisfy high-speed and real-time pulsar search demand, and the system power consumption, complexity and cost are rising rapidly

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