Celestial Navigation Methods for Space Explorers

Abstract

With the development of the space exploration missions, a practical and reliable capability for autonomous navigation is urgently needed to reduce operation cost, to improve operational e ciency and to increase mission safety by avoiding dangerous delay in ground control. Celestial navigation is a very attractive autonomous navigation solution for the space exploration missions. It suits LEO satellites as well as high earth orbit (HEO) satellites and deep space explorers. In this paper, a comprehensive overview of the current state and future trend of celestial navigation methods for three types of space explorers are introduced, which include satellites, deep space probes and planetary rovers.

Torsional Stability of Research and Discussion on the Conductor-Spacers System

“…Although residual moment has a contribution to the anti-skid of conductors [3] ,it will pose a security risk to the torsional stability of conductor-spacers system on the appropriate weather conditions [4] .…”

An Adjusting Method for the Suspender Force of Continuous Beam Arch Combination Bridge Based on Influence Matrix

“…It's very difficult to find the adjustment scheme for this continuous beam arch combination bridge because under the coupling effect of continuous beam and arch, the rule of adjusting single suspender force on others is very complicated. The common way to determine the suspender tension construction is taking-away method [4]. However, in actual construction, it's very difficult to calculate the suspension cable tension by taking-away method because stents are set under the beam and the suspender force state has changed dramatically after removing the stents [5].…”

Precise Attitude Determination of Ship Based on Star Sensor

“…The accuracy of platform inertial navigation system is difficult to be further improved. CNS can not be divorced from the INS to work independently by using altitude difference method, thus course measurement accuracy is limited by pitch and roll measurement accuracy [1] .…”