GPS Based Reduced-Dynamic Orbit Determination for Low Earth Orbiters with Ambiguity Fixing

Yang, Yang; Yue, Xiaokui; Yuan, Jianping

doi:10.1155/2015/723414

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…Equations ( 1) and ( 2) are combined to obtain the expressions of the ionosphere-free measurement models that are listed hereafter [14,35,38,39] denote the sum of the pseudo-range and carrier-phase ionosphere-free unmodeled errors, respectively.…”

Section: Observation Modelmentioning

confidence: 99%

“…Thus, the N s r/LEO,IF can usually be combined by wide-lane (WL) and narrow-lane (NL) ambiguities. Additionally, to eliminate the influence of receiver-clock offsets and their hardware delay biases, a single difference between GNSS satellites (SDBS) is adopted to fix WL and NL ambiguities, as shown in the Equation ( 6) [26,38].…”

Section: Ambiguity-resolution-based Ipc Productsmentioning

confidence: 99%

“…Because the measurement noise and multipath effects of MW combination observation are relatively large, a time smoother is needed for multi-epoch smoothing as formulated, thereby reducing the impact of measurement noise and multipath effects [26,27,38], as formulated in (8):…”

Section: Ambiguity-resolution-based Ipc Productsmentioning

confidence: 99%

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Real-Time Precise Orbit Determination for LEO between Kinematic and Reduced-Dynamic with Ambiguity Resolution

Wang

et al. 2022

Aerospace

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The real-time integer-ambiguity resolution of the carrier-phase observation is one of the most effective approaches to enhance the accuracy of real-time precise point positioning (PPP), kinematic precise orbit determination (KPOD), and reduced-dynamic precise orbit determination (RPOD) for low earth orbit (LEO) satellites. In this study, the integer phase clock (IPC) and wide-lane satellite bias (WSB) products from CNES (Centre National d’Etudes Spatiales) are used to fix ambiguity in real time. Meanwhile, the three models of real-time PPP, KPOD, and RPOD are applied to validate the contribution of ambiguity resolution. Experimental results show that (1) the average positioning accuracy of IGS stations for ambiguity-fixed solutions is improved from about 7.14 to 5.91 cm, with an improvement of around 17% compared to the real-time float PPP solutions, with enhancement in the east-west direction particularly significant, with an improvement of about 29%; (2) the average accuracy of the estimated LEO orbit with ambiguity-fixed solutions in the real-time KPOD and RPOD mode is improved by about 16% and 10%, respectively, with respect to the corresponding mode with the ambiguity-float solutions; (3) the performance of real-time LEO RPOD is better than that of the corresponding KPOD, regardless of fixed- or float-ambiguity solutions. Moreover, the average ambiguity-fixed ratio can reach more than 90% in real-time PPP, KPOD, and RPOD.

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Section: Observation Modelmentioning

confidence: 99%

Section: Ambiguity-resolution-based Ipc Productsmentioning

confidence: 99%

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Real-Time Precise Orbit Determination for LEO between Kinematic and Reduced-Dynamic with Ambiguity Resolution

Wang

et al. 2022

Aerospace

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“…The application of the GPS and satellite navigation systems for position determination of the satellites exists from the beginning of the GPS operation [1,2]. Satellite navigation is also used in other space applications, like relative positioning for satellite rendezvous and satellite swarms [3][4][5][6][7][8] and satellite attitude determination [9][10][11] using interferometric measurement by several antennas.…”

Section: Introductionmentioning

confidence: 99%

Experiences with the GPS in Unstabilized CubeSat

Kovář

2020

International Journal of Aerospace Engineering

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The paper summarizes the experiences with the operation of the piNAV GPS receiver in a 1U unstabilized CubeSat operated on LEO orbit. piNAV L1 is a GPS receiver developed by an author for small satellite missions. The receiver is equipped with the 15 GPS L1 C/A channels and acquisition accelerator that shortens the cold start of the receiver on LEO to 65 s. The typical power consumption is 120 mW. Lucky-7 is a private 1U technological CubeSat with power budget 1 W that operates on the quasisynchronous polar orbit at altitude 520 km. One of its scientific missions is to test the operation of GPS. The space experiments proved the successful operation of the GPS receiver. The position information was available for approximately 80% of the time, where the position outage was caused by a satellite rotation and relatively long navigation signal reacquisition. The experimental data proved that the position availability can be improved by a higher-performance signal acquisition engine.

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Precise orbit determination of LEO satellites: a systematic review

Selvan,

Siemuri,

Prol

et al. 2023

GPS Solut

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The need for precise orbit determination (POD) has grown significantly due to the increased amount of space-based activities taking place at an accelerating pace. Accurate POD positively contributes to achieving the requirements of Low-Earth Orbit (LEO) satellite missions, including improved tracking, reliability and continuity. This research aims to systematically analyze the LEO–POD in four aspects: (i) data sources used; (ii) POD technique implemented; (iii) validation method applied; (iv) accuracy level obtained. We also present the most used GNSS systems, satellite missions, processing procedures and ephemeris. The review includes studies on LEO–POD algorithms/methods and software published in the last two decades (2000–2021). To this end, 137 primary studies relevant to achieving the objective of this research were identified. After the investigation of these primary studies, it was found that several types of POD techniques have been employed in the POD of LEO satellites, with a clear trend observed for techniques using reduced-dynamic model, least-squares solvers, dual-frequency signals with undifferenced phase and code observations in post-processing mode. This review provides an understanding of the various POD techniques, dataset utilized, validation techniques, and accuracy level of LEO satellites, which have interest to developers of small satellites, new researchers and practitioners.

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GPS Based Reduced-Dynamic Orbit Determination for Low Earth Orbiters with Ambiguity Fixing

Cited by 7 publications

References 24 publications

Real-Time Precise Orbit Determination for LEO between Kinematic and Reduced-Dynamic with Ambiguity Resolution

Real-Time Precise Orbit Determination for LEO between Kinematic and Reduced-Dynamic with Ambiguity Resolution

Experiences with the GPS in Unstabilized CubeSat

Precise orbit determination of LEO satellites: a systematic review

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