Qingbao He

Southern University of Science and Technology

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i-10 index

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Qinghui Liu

Oslo University Hospital

Peijia Li

Guangdong Academy of Agricultural Sciences

Jianguo Yan

State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing

Li Guo

Shanghai Astronomical Observatory

Kaijun Liu

Guizhou Normal University

Xin Zheng

China Southern Power Grid (China)

Zhichao Wang

University of Chinese Academy of Sciences

Yajun Wu

Shanghai University

MingLe Tang

University of Chinese Academy of Sciences

Chang Shengqi

Shanghai Astronomical Observatory

Cooperative Institutions

Shanghai Astronomical Observatory

University of Chinese Academy of Sciences

Chinese Academy of Sciences

Wuhan University

State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing

China University of Geosciences

Shandong University of Technology

Osaka Health Science University

Osaka University

Netherlands Institute for Radio Astronomy

Author Statistics

Papers

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Precise positioning of Chang’e 3 lander based on Helmert-VCE-aided weighting method using phase delay data from Chinese VLBI Network

Advances in Space Research (2020)

Shanhong Liu Jianguo Yan Qingbao He Jianfeng Cao Mao Ye

Very-long-baseline interferometry

Ephemeris

Position (finance)

Orbiter

10.1016/j.asr.2020.05.034

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Citations (3)

Monitoring motion and measuring relative position of the Chang'E‐3 rover

Radio Science (2014)

Qinghui Liu Xin Zheng Yong Huang Peijia Li Qingbao He

Abstract Same‐beam very long baseline interferometry observations were performed between the rover and the lander of Chang'E‐3 and differential phase delay data were obtained with the minimum random error of about 0.03 ps. These data were used to monitor the rover motions, as small as several centimeters, including movement, turning, and attitude adjustment. The relative position between the rover and the lander was precisely measured with an accuracy of 1 m, which is an improvement of 10 times compared with that of the Apollo project.

Position (finance)

Random error

Relative Motion

10.1002/2014rs005449

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Citations (27)

Using cross correlation to estimate Doppler frequency

Advances in Space Research (2020)

Qingbao He Yongzhang Yang Fei Li Jianguo Yan Yihao Chen

Cross-correlation

Doppler frequency

SIGNAL (programming language)

Orbit Determination

10.1016/j.asr.2020.01.007

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Citations (7)

Investigation on peculiar SNR variation at TianMa radio telescope

Scientific Reports (2019)

Qingbao He

Chinese lunar spacecraft Chang'E-3 (CE3) and Chang'E5-T1 (CE5T1) were launched in 2013 and 2014, respectively and very long baseline interferometry (VLBI) observations were performed. Signal to noise ratio (SNR) of the Tianma (TM) station experienced peculiar variation, whereas SNRs of other stations were rather stable. Further, it happened only when observing spacecraft, and showed no such variation when performing astronomical observations. Moreover, it was distinctive on X band signals, whereas it was not noticed on S band signals. Analysis showed that the SNR variation was closely related with changing rate of elevation angle. Further investigations discovered that there were two sets of antenna control software at TM station, and the SNR variation originated from a bug in elevation control software used for observing spacecraft, not for astronomical observations. The bug caused big pointing error (around ± 30 as) on elevation angle of TM, which resulted in the peculiar SNR variation. It was not noticed on S band signals due to its relatively wide and flat main beam comparing with ± 30 as pointing error. However, the bug was fixed in software update in July, 2016, and the SNR of TM showed no such variation in 2017 and 2018.

Variation (astronomy)

10.1038/s41598-019-55072-3

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Citations (3)

Large TEC Variations Between Mars and Earth: Simulation and Observation Comparisons

Journal of Geophysical Research Space Physics (2024)

Qingbao He Kaijun Liu Zhichao Wang Qinghui Liu Li Guo

Abstract Large total electron content (TEC) variations along the line from Mars to Earth have been demonstrated by analyzing the ground received Tianwen‐1 differential one‐way range (DOR) signals when corona mass ejections (CMEs) and co‐rotating interaction regions (CIRs) pass through the signal path. Here, the TEC variations along the line from Mars to Earth are calculated from the Wang‐Sheeley‐Arge (WSA)‐Enlil space weather forecast model. The results are compared with the Tianwen‐1 line of sight (LOS) observations as well as the STEREO‐A in situ solar wind density measurements. It is found that the TEC variations calculated from the WSA‐Enlil model are usually much smaller in amplitude, especially in the cases of CIRs passing through the signal path. In addition, the timings of CMEs and CIRs passing through the DOR signal path in the WSA‐Enlil model can be half a day earlier or later than the observed ones. In comparison with in situ solar wind measurements, the ground received Tianwen‐1 DOR signals carry solar wind density information over a large spatial region along the signal path. Such remote sensing measurement can be valuable for constraining and improving global solar wind forecast models.

10.1029/2023ja032212

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Citations (0)

Investigation on unexpected variations of differential phase delay of Chang’E-3

Advances in Space Research (2021)

Qingbao He Kaijun Liu Shengyi Ye Qinghui Liu Tao Deng

Differential phase

SIGNAL (programming language)

10.1016/j.asr.2021.07.025

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Citations (3)

Study on Differential Phase Delay of Same‐Beam VLBI in Rendezvous and Docking of Chang'E‐5

Radio Science (2023)

Zhichao Wang Peijia Li Xin Zheng Qinghui Liu Maoli Ma

Abstract The Chang'E‐5 (CE5) ascender achieved lunar orbit autonomous rendezvous and docking with orbiter‐returner successfully on 5 December 2020. Same‐beam Very Long Baseline Interferometry (VLBI) (SBI) observations were performed for the first time for autonomous rendezvous and docking in lunar orbit. In this paper, by studying the CE5 rendezvous and docking data observed by the Chinese VLBI network and analyzing the residual differential phase delay of the autonomous control phase, we successfully captured the maneuver of the 5 km holding of the orbiter‐returner. The differential phase delay (DPD) data of the far‐range guidance phase were used to perform orbit determination of the ascender and orbiter‐returner successfully. The results of orbit determination show that the DPD data can improve the relative position accuracy between the ascender and the orbiter‐returner, and the residual root mean square of the DPD data is 5 ps. Furthermore, when one of the probes has only DPD data, its orbit can also be determined.

Rendezvous

Orbiter

Differential phase

Very-long-baseline interferometry

Orbit Determination

Orbit (dynamics)

Ephemeris

Root mean square

10.1029/2022rs007599

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Citations (1)

Chang'E‐3 spacecraft surface reflection causes turbulence on VLBI delay

Radio Science (2017)

Qingbao He Qinghui Liu Xin Zheng

Abstract The third Chinese lunar spacecraft Chang'E‐3 (CE3) was launched in 2013, and very long baseline interferometry (VLBI) observations were performed to improve accuracy of its orbit determination. During all the observation time, VLBI group delay experienced very large turbulence, which was up to hundreds of picoseconds, and with variation period of a few tens of seconds. However, VLBI group delay of another lunar spacecraft Chang'E‐5‐T1 (CE5T1), which was launched in 2014, did not show such turbulence. Influences from the troposphere, ionosphere, ground instruments, and phase characteristics of the on board antennas were considered at first, but none of these were the main cause of this large turbulence. Further investigations were made on differential phase delay turbulence, signal‐to‐noise ratio, and layout of spacecraft. The investigation results indicated that the large turbulence on group delay was caused by an interference of reflected signals from the CE3 spacecraft surface. Simulations proved that the delay error caused by signal reflection varied with frequency and therefore caused large turbulence on group delay. To minimize the multipath effect caused by signal reflection, some possible solutions are presented.

Very-long-baseline interferometry

Lunar orbit

Reflection

10.1002/2016rs006228

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Citations (7)

A New Try of Connecting Phase and Solving Phase Delay in VLBI

Chinese Astronomy and Astrophysics (2017)

Qingbao He Qinghui Liu Chang Shengqi Xin Zheng

Very-long-baseline interferometry

Orbit (dynamics)

Orbit Determination

Differential phase

Position (finance)

10.1016/j.chinastron.2017.11.011

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Citations (1)