Method and system for VLBI measurement based on X-rays and ground verification device

Abstract

The invention provides a method and system for VLBI measurement based on X-rays and a ground verification device. The pulsar angular position can be accurately measured while a parallax range is greatly shortened. The measurement system comprises two paths of parallelly set X-ray single photon detection systems and a self-correlation processor for performing strength relevance calculation on two paths of measured signals, wherein each path of X-ray single photon detection system comprises X-ray focusing optical modules, X-ray single photon detectors, time compensation cables, a front end electronics module and a data processing module which are arranged sequentially. The displacement set by the difference of initial positions of the two paths of X-ray focusing optical modules and the X-ray single photon detectors in the optical axis direction makes a set optical path difference exist when the same light source enters the two paths of X-ray single photon detectors, and initial alignment of time sequences of output signals of the two paths of X-ray single photon detectors can be performed through different configurations of the time compensation cables.

Description

technical field [0001] The invention relates to a VLBI (Very Long Baseline Interferometry) measurement method and system, which can be applied to the high-precision angular position measurement research of X-ray pulsars, and also relates to a corresponding ground verification device. Background technique [0002] To realize X-ray pulsar navigation, the exact position and coordinates of the pulsar itself that will be used for navigation must first be determined. That is, the angular position of the pulse source relative to the detector must be determined first. [0003] At present, the angular position measurement of pulsars is mainly based on VLBI (Very Long Baseline Interferometry) technology in the radio band. The VLBI method is to use two telescopes separated by two places to receive the electromagnetic waves emitted by the same celestial body, and then perform interference or correlation calculations on the two waves. Single Aperture Telescope. Using this method, the ...

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Problems solved by technology

[0005] However, compared with the radio band and visible light, due to the slow progress in the research of optical components applied to X-rays, and the extremely high frequency of X-rays, it is very difficult to focus, change direction, and image X-rays. The VLBI theoretical method and devices in the radio band cannot be directly extended to the X-ray band

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