Based on the Construction of University Library and the Evaluation of Space Service Quality

In order to strengthen the construction of university library,promote the sustainable development of university library,and provide a good library space environment for university students,this paper expounds the quality evaluation of university library by establishing the evaluation index of space service quality,and puts forward the ways to improve the service quality of University Library for reference.

Navigation performance analysis of Earth-Moon spacecraft using GNSS,INS,and star tracker

Global Navigation Satellite System(GNSS)can provide an approach for spacecraft autonomous navigation in earth-moon space to make up for the insufficiency of earth-based tracking,telemetry,and control systems.However,its weak power and poor observation geometry near the moon causes new problems.After the GNSS signal characteristics and satellite visibility were evaluated in Phasing Orbit and Lunar Transfer Orbit,we proposed an adaptive Kalman filter based on the Carrier-to-Noise ratio(C/N0)and innovation vector to weaken the influence of GNSS accuracy attenuation as much as possible.The experimental results show that the spacecraft position and velocity accuracy are better than 10 m and 0.1 m/s near the Earth,and better than 50 m and approximately 0.2 m/s near the moon use GNSS with the proposed adaptive algorithms.Additionally,because of the deterioration of navigation performance based on the orbit filter during orbital maneuvering,we used accelerometer data to compensate for the dynamic model to maintain navigation performance.The results of the experiment provide a reference for subsequent studies.

Coordinated target localization base on pseudo measurement for clustered space robot

This paper presents a coordinated target localization method for clustered space robot.According to the different measuring capabilities of cluster members,the master-slave coordinated relative navigation strategy for target localization with respect to slavery space robots is proposed;then the basic mathematical models,including coordinated relative measurement model and cluster centralized dynamics,are established respectively.By employing the linear Kalman flter theorem,the centralized estimator based on truth measurements is developed and analyzed frstly,and with an intention to inhabit the initial uncertainties related to target localization,the globally stabilized estimator is designed through introduction of pseudo measurements.Furthermore,the observability and controllability of stochastic system are also analyzed to qualitatively evaluate the convergence performance of pseudo measurement estimator.Finally,on-orbit target approaching scenario is simulated by using semi-physical simulation system,which is used to verify the convergence performance of proposed estimator.During the simulation,both the known and unknown maneuvering acceleration cases are considered to demonstrate the robustness of coordinated localization strategy.