Effects of BDS-2 satellite flex power on daily DCB estimation

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2025-03-07 DOI:10.1016/j.asr.2025.03.009

Tiancheng Liu , Aochuan Zhang , Shun Lu , Shuhui Li , Zhou Wu

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引用次数: 0

Abstract

BeiDou Navigation Satellite System (BDS) is equipped with the flex power function to improve the anti-jamming capability of signals. Flex power can impact differential code biases (DCBs), and further affect navigation and positioning. Therefore, it is important to study the effects of a flex power on DCB estimation. In this paper, we used flex power detector (FPD) algorithm to detect flex power and found that there was a total of nine BDS-2 satellite flex power events during 2020–2023. Among these nine events, flex power of Inclined Geosynchronous Orbit (IGSO) satellites was turned on most frequently and stepwise changes around 3–10 dB were visible in carrier-to-noise density ratio (C/N₀) observation S6I. We estimated C2I-C6I DCBs considering flex power. By comparing DCB estimates in flex power periods with those in non-flex power periods, the impacts of flex power on DCB estimation can be examined. The results show that the effects of BDS-2 satellite flex power on DCB estimation are different in different satellite types, which is 4.66 ns, 12.43 ns, 15.76 ns for Geostationary Orbit (GEO), IGSO and Middle Earth Orbit (MEO) satellites, respectively. Also, it is worth mentioning that DCB estimation values considering flex power are different from DCB values of IGS daily products. Therefore, it is necessary to consider the effects of flex power on DCB estimation.

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BDS-2卫星挠性功率对日DCB估计的影响

北斗卫星导航系统（BDS）采用柔性功率功能，提高了信号的抗干扰能力。Flex功能可以影响差分代码偏差（DCBs），并进一步影响导航和定位。因此，研究弯曲功率对DCB估计的影响具有重要意义。本文采用柔性功率检测器（FPD）算法对柔性功率进行检测，发现2020-2023年北斗二号卫星共发生9次柔性功率事件。在这9个事件中，倾斜地球同步轨道（IGSO）卫星的弯曲功率开启频率最高，S6I观测的载噪密度比（C/N0）出现了3 ~ 10 dB左右的逐步变化。考虑弯曲功率，我们估计了C2I-C6I dcb。通过比较柔性功率期和非柔性功率期的DCB估计，可以检验柔性功率对DCB估计的影响。结果表明，不同卫星类型的BDS-2卫星挠曲功率对DCB估计的影响不同，静止轨道（GEO）、IGSO和中地球轨道（MEO）卫星挠曲功率分别为4.66 ns、12.43 ns和15.76 ns。另外，值得一提的是，考虑挠性功率的DCB估计值与IGS日常产品的DCB值不同。因此，有必要考虑挠性功率对DCB估计的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.