Rearch on PN-DOR Beacon Used in the VLBI Orbit

Subjects: Astronomy submitted time 2024-01-05 Cooperative journals: 《天文学进展》

CHEN Ao, TONG Li, WANG Rui, ZHENG Wei-min

Abstract： Phase fluctuation error is one of the important errors of VLBI orbit system in the lunar exploration and deep space exploration. It is caused by the different spectrum structure of DOR and radio source signal, which leads to the inconsistency of phase fluctuation of receiving equipment. The novel PN-DOR beacon realizes the spectrum structure similar to the radio signal through the spread spectrum modulation of the existing DOR beacon by the pseudo random sequence, which can effectively reduce the phase fluctuation error. This paper studies the calculation methods of phase error and bandwidth synthesis group delay error of PN-DOR beacon in VLBI orbit measurement. On this basis, by comparing the total delay error of PN-DOR and DOR beacon under the same transmission power, the applicable condition of PN-DOR is analyzed.

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