Autonomous Prediction of GPS and GLONASS Satellite Orbits

Seppänen, Mari; Ala-Luhtala, Juha; Piché, Robert; Martikainen, Simo; Ali-Löytty, Simo

doi:10.1002/navi.10

Cited by 28 publications

(14 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From (22), it can be seen that the URE is mainly affected by the satellite orbit data error in the radial direction. So, in the tests, the MLTOP results errors in the radial direction were chosen as an important evaluation index.…”

Section: Resultsmentioning

confidence: 99%

“…The EOP parameters can be estimated as elements of the initial vector of the orbit fitting process. Together with the satellite's position, velocity, and the solar radiation pressure parameters of the initial epoch [22], it can be improved in the orbit fitting process. In other words, the initial vector to be estimated is first given an initial value, and then the observations obtained from the historical broadcast ephemeris data can be used to improve the initial vector.…”

Section: Medium-and Long-term Ephemeris Extensionmentioning

confidence: 99%

“…When it is used completely independently on a device without network connection, it is necessary to predict the EOP parameters or to estimate the EOP parameters together with the satellite initial state vector under certain optimal criteria [22].…”

Section: Medium-and Long-term Ephemeris Extensionmentioning

confidence: 99%

“…The available ephemeris information plays an important role in these features of the self-assisted GNSS receivers. As a practical way to improve the usability of satellite ephemeris, the historical broadcast ephemeris data, already stored in the receiver, can be used to predict the Medium-and Long-Term Orbit (MLTO) and satellite clock data of the BeiDou satellites [8,9]. Above all, the BDS receiver, to achieve the shortest TTFF [9], should adopt the Self-Assisted First Fix (SAFF) methods with the mediumand long-term extended ephemeris.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Self-Assisted First-Fix Method for A-BDS Receivers with Medium- and Long-Term Ephemeris Extension

Shen

Peng

Liu

et al. 2018

Mathematical Problems in Engineering

View full text Add to dashboard Cite

As a sensor for standalone position and velocity determination, the BeiDou Navigation Satellite System (BDS) receiver is becoming an important part of the intelligent logistics systems under rapid development in China. The applications in the mass market urgently require the BDS receivers to improve the performance of such functions, that is, shorter Time to First Fix (TTFF) and faster navigation signal acquisition speed with Ephemeris Extension (EE) in standalone mode. As a practical way to improve such functions of the Assisted BDS (A-BDS) receivers without the need for specialized hardware support, a Self-Assisted First-Fix (SAFF) method with medium-and long-term EE is proposed in this paper. In this SAFF method, the dynamic Medium-and Long-Term Orbit Prediction (MLTOP) method, which uses the historical broadcast ephemeris data with the optimal configuration of the dynamic models and orbit fitting time interval, is utilized to generate the extended ephemeris. To demonstrate the performance of the MLTOP method used in the SAFF method, a suit of tests, which were based on the real data of broadcast ephemeris and precise ephemeris, were carried out. In terms of the positioning accuracy, the overall performance of the SAFF method is illustrated. Based on the characteristics of the medium-and long-term EE, the simulation tests for the SAFF method were conducted. Results show that, for the SAFF method with medium-and long-term EE of the BeiDou MEO/IGSO satellites, the horizontal positioning accuracy is about 12 meters, and the overall positioning accuracy is about 25 meters. The results also indicate that, for the BeiDou satellites with different orbit types, the optimal configurations of the MLTOP method are different.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Medium-and Long-term Ephemeris Extensionmentioning

confidence: 99%

Section: Medium-and Long-term Ephemeris Extensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Self-Assisted First-Fix Method for A-BDS Receivers with Medium- and Long-Term Ephemeris Extension

Shen

Peng

Liu

et al. 2018

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…In order to accurately compute a GNSS satellite orbit, it is necessary to correct the BE's initial orbital state [3], [4]. Seppaanen et al [3] used an iterative nonlinear least squares algorithm to fit the force model's orbit to points on the BE's orbit.…”

Section: Introductionmentioning

confidence: 99%

Application of the Hill-Clohessy-Wiltshire equation in GNSS orbit prediction

Zhang

Piché

2014

International Conference on Localization and GNSS 2014 (ICL-GNSS 2014)

View full text Add to dashboard Cite

We present an initial state correction algorithm for GNSS orbit prediction that uses the solution of the HilI-Clohessy Wiltshire equation to build the Jacobian matrix. This algorithm improves the accuracy of GNSS orbit prediction through adding one or more observations. In the tests of 14 days orbit prediction, by adding one broadcast ephemeris as an observation collected before the initial BE with a long enough interval, we get orbit only User Range Error within 70 meters, and orbit errors in the radial direction is less than 15 meters. In tangential direction, the error is within 400 meters.

show abstract

A long‐term broadcast ephemeris model for extended operation of GNSS satellites

2020

View full text Add to dashboard Cite

GNSS positioning relies on orbit and clock information, which is predicted on the ground and transmitted by the individual satellites as part of their broadcast navigation message. For an increased autonomy of either the space or user segment, the capability to predict a GNSS satellite orbit over extended periods of up to two weeks is studied. A tailored force model for numerical orbit propagation is proposed that offers high accuracy but can still be used in real‐time environments. Using the Galileo constellation with its high‐grade hydrogen maser clocks as an example, global average signal‐in‐space range errors of less than 25 m RMS and 3D position errors of less than about 50 m are demonstrated after two‐week predictions in 95% of all test cases over a half‐year period. The autonomous orbit prediction model thus enables adequate quality for a rapid first fix or contingency navigation in case of lacking ground segment updates.

show abstract

Autonomous Prediction of GPS and GLONASS Satellite Orbits

Cited by 28 publications

References 11 publications

Self-Assisted First-Fix Method for A-BDS Receivers with Medium- and Long-Term Ephemeris Extension

Self-Assisted First-Fix Method for A-BDS Receivers with Medium- and Long-Term Ephemeris Extension

Application of the Hill-Clohessy-Wiltshire equation in GNSS orbit prediction

A long‐term broadcast ephemeris model for extended operation of GNSS satellites

Contact Info

Product

Resources

About