A space x-ray shielding device for pulsar navigation

Abstract

The invention provides a space x-ray shielding device used for pulsar navigation. According to the invention, the device is placed with multilayer nested truncated-cone-shaped tantalum rings in a main body structure, and the wall thickness of the main body structure gradually uniformly thickens from one end close to an external optical lens to the other end close to an external detector; thus, shielding of x-rays entering from a non visual field direction can be realized; the x-rays generated by secondary excitation due to penetration of space high-energy x-rays are prevented; damage of background noise to the detector is reduced; adjustment of the barycenter position of the shielding device is facilitated; and requirements on satellite attitude and orbit control are reduced. The space x-ray shielding device used for pulsar navigation provided by the invention uses an aluminum-alloy-prepared main body structure to support the whole shielding device; a lead layer plated on the outer wall of the shielding device is used to absorb incident high-energy x-rays from periphery; and a lead-antimony-cerium alloy layer plated on the inner wall of the shielding device can improve absorption rate of secondarily-excited x-rays. The device has simple realization principle and good shielding effect and is suitable for a pulsar navigation system to shield x-rays.

Description

technical field [0001] The invention relates to the technical field of spacecraft space environment protection, in particular to a space X-ray shielding device for pulsar navigation. Background technique [0002] X-ray pulsar-based navigation is a new generation of potential autonomous navigation technology. Pulsar navigation identifies the weak X-ray photons emitted by pulsars with high resolution, and marks the arrival time of X-ray photons with high precision, and obtains the observed pulsar profile through multi-period equiphase epoch superposition, which is obtained by comparing with the standard pulsar profile The pulse arrives at the moment, and then realizes autonomous navigation. In fact, X-ray pulsar navigation can not only provide time information, attitude information and position information for spacecraft, but also achieve high-precision timing, which can be widely used in low-earth orbit, geostationary orbit, deep space exploration and interstellar flight au...

AI Technical Summary

Problems solved by technology

[0004] For space X-ray shielding, there are two main methods commonly used at present. One is the material reinforcement method (passive shielding). Although this method can better shield the space background X-rays, it will also require the detection of pulsars. X-rays are shielded, and soft X-rays for pulsar navigation cannot be obtained, and the shielding efficiency and load weight of this method have always been conflicting goals, and cannot be optimized at the same time; the other is a collimated shielding method, This method is only applicable to the parallel incident X-ray photon shielding system. Although it can limit the field of view, it cannot block the parallel incident X-ray photons in the space background, and the shielding effect and scope of application are limited.

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