Injected transfer orbit determination of lunar probe Chang’E 5T1 using short-arc rocket GPS measurements

Fang, Haijian; Zhang, Rongzhi; Wang, Jiasong; Wang, Dan; Hai, Guo

doi:10.1016/j.asr.2015.07.011

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…The Chang’E-5T lunar probe is equipped with a high sensitivity GNSS receiver which could capture the GPS and GLONASS code and carrier wave signal. Fang et al [ 27 ] firstly proved the idea of using rocket GPS measurements to determine the injected transfer orbit of Chang’E-5T. Fan et al [ 28 ] conducted Chang’E-5T OD using onboard GPS pseudo-range measurements by dynamic method, and results showed that the position error in the one-h prediction from the OD of 1.5 h arc is less than 109 m. However, the higher accuracy carrier phase measurements were not used in Fang et al [ 27 ] or Fan et al [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…Fang et al [ 27 ] firstly proved the idea of using rocket GPS measurements to determine the injected transfer orbit of Chang’E-5T. Fan et al [ 28 ] conducted Chang’E-5T OD using onboard GPS pseudo-range measurements by dynamic method, and results showed that the position error in the one-h prediction from the OD of 1.5 h arc is less than 109 m. However, the higher accuracy carrier phase measurements were not used in Fang et al [ 27 ] or Fan et al [ 28 ]. For the combined use of pseudo-range and carrier phase measurements in SSV, weighting approach needs to be investigated because of the lack of a priori measurement precision information compared to TSV users.…”

Section: Introductionmentioning

confidence: 99%

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Chang’E-5T Orbit Determination Using Onboard GPS Observations

Su¹,

Geng²,

Li³

et al. 2017

Sensors

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In recent years, Global Navigation Satellite System (GNSS) has played an important role in Space Service Volume, the region enclosing the altitudes above 3000 km up to 36,000 km. As an in-flight test for the feasibility as well as for the performance of GNSS-based satellite orbit determination (OD), the Chinese experimental lunar mission Chang’E-5T had been equipped with an onboard high-sensitivity GNSS receiver with GPS and GLONASS tracking capability. In this contribution, the 2-h onboard GPS data are evaluated in terms of tracking performance as well as observation quality. It is indicated that the onboard receiver can track 7–8 GPS satellites per epoch on average and the ratio of carrier to noise spectral density (C/N0) values are higher than 28 dB-Hz for 90% of all the observables. The C1 code errors are generally about 4.15 m but can be better than 2 m with C/N0 values over 36 dB-Hz. GPS-based Chang’E-5T OD is performed and the Helmert variance component estimation method is investigated to determine the weights of code and carrier phase observations. The results reveal that the orbit consistency is about 20 m. OD is furthermore analyzed with GPS data screened out according to different C/N0 thresholds. It is indicated that for the Chang’E-5T, the precision of OD is dominated by the number of observed satellite. Although increased C/N0 thresholds can improve the overall data quality, the available number of GPS observations is greatly reduced and the resulting orbit solution is poor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chang’E-5T Orbit Determination Using Onboard GPS Observations

Su¹,

Geng²,

Li³

et al. 2017

Sensors

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show abstract

“…Due to its attributes of global coverage, all weather operation, high accuracy, etc., global positioning system (GPS) has been playing an important role in various civil or military applications, including the aerospace engineering. [1][2][3][4] The signal acquisition is the first stage of the baseband signal processing in GPS receivers, and greatly influences the whole performance of the receiver.…”

Section: Introductionmentioning

confidence: 99%

Novel acquisition of global positioning system signals based on parameter prediction and the chirp z-transform

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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The acquisition stage in global positioning system receivers provides a coarse estimation of the Doppler shift and the code phase of the incoming signals. The accuracy of the estimation, especially the Doppler shift, greatly influences the subsequent tracking loops. Based on the parameter prediction and the chirp z-transform algorithm, a novel acquisition approach to acquire the Doppler shift accurately is proposed. The code phase and the Doppler shift are predicted first according to the desired trajectory of the vehicle and satellite ephemeris. Then, frequency refinement of the code-stripped signal is conducted within a small interval around the predicted Doppler shift by using the chirp z-transform algorithm. To reduce the computational load, the data sequence is down-sampled with an integrate and dump accumulator without degrading the performance of the proposed algorithm. Results indicate that, with only 1 ms sampled data, the proposed algorithm can achieve a high-frequency accuracy. Besides, the proposed algorithm can acquire signals with the carrier-to-noise ratio down to 31 dB-Hz.

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Attitude pointing schemes and spacecraft configurations for libration-point-orbit spacecraft

Liang

Luo

et al. 2017

Aerospace Science and Technology

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Injected transfer orbit determination of lunar probe Chang’E 5T1 using short-arc rocket GPS measurements

Cited by 3 publications

References 13 publications

Chang’E-5T Orbit Determination Using Onboard GPS Observations

Chang’E-5T Orbit Determination Using Onboard GPS Observations

Novel acquisition of global positioning system signals based on parameter prediction and the chirp z-transform

Attitude pointing schemes and spacecraft configurations for libration-point-orbit spacecraft

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