Title of article :
On the Equation of Position Measurement of XNAV
Author/Authors :
Guo-zheng، نويسنده , , Yao and Bao-jun، نويسنده , , Fei and Yu، نويسنده , , Xiao، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
7
From page :
382
To page :
388
Abstract :
The equation of position measurement of XNAV (X-ray pulsar-based autonomous navigation) reveals the relation between the time of arrival (TOA) of an X-ray photon and the spacecraft position at this moment. In specific dis- cussions of navigation, the TOA is generally replaced by the difference between the TOA and a preset “time reference”, and the spacecraft position is expressed by the position vector in the barycentric system of the solar system. The “time reference” may be the true TOA at the solar-system barycenter (SSB), or an “equivalent TOA” at SSB. As the true TOA at SSB is difficult to obtain, the “equivalent TOA” is more convenient for navigation. The equations of position measurement based on the two kinds of “time reference” are discussed, the equa- tion based on the “equivalent TOA”, which has the time accuracy of 0.1 ns, is given, and the physical meanings of the every term in which are analyzed.
Keywords :
celestial mechanics , reference systems , Time , Methods: analyti- cal
Journal title :
Chinese Astronomy and Astrophysics
Serial Year :
2012
Journal title :
Chinese Astronomy and Astrophysics
Record number :
2264150
Link To Document :
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