Precision real-time navigation of LEO satellites using global positioning system measurements

Continued advancements in remote sensing technology along with a trend towards highly autonomous spacecraft provide a strong motivation for accurate real-time navigation of satellites in low Earth orbit (LEO). Global Navigation Satellite System (GNSS) sensors nowadays enable a continuous tracking and provide low-noise radiometric measurements onboard a user spacecraft. Following the deactivation of Selective Availability a representative real-time positioning accuracy of 10 m is presently achieved by spaceborne global positioning system (GPS) receivers on LEO satellites. This accuracy can notably be improved by use of dynamic orbit determination techniques. Besides a filtering of measurement noise and other short-term errors, these techniques enable the processing of ambiguous measurements such as carrier phase or code-carrier combinations. In this paper a reference algorithm for real-time onboard orbit determination is described and tested with GPS measurements from various ongoing space missions covering an altitude range of 400–800 km. A trade-off between modeling effort and achievable accuracy is performed, which takes into account the limitations of available onboard processors and the restricted upload capabilities. Furthermore, the benefits of different measurements types and the available real-time ephemeris products are assessed. Using GPS broadcast ephemerides a real-time position accuracy of about 0.5 m (3D rms) is feasible with dual-frequency carrier phase measurements. Slightly inferior results (0.6–1 m) are achieved with single-frequency code-carrier combinations or dual-frequency code. For further performance improvements the use of more accurate real-time GPS ephemeris products is mandatory. By way of example, it is shown that the TDRSS Augmentation Service for Satellites (TASS) offers the potential for 0.1–0.2 m real-time navigation accuracies onboard LEO satellites.

[1]  Oliver Montenbruck,et al.  Reduced dynamic orbit determination using GPS code and carrier measurements , 2005 .

[2]  Oliver Montenbruck,et al.  State interpolation for on-board navigation systems , 2001 .

[3]  Lin Haas,et al.  Real-Time High Accuracy GPS Onboard Orbit Determination For Use On Remote Sensing Satellites , 1999 .

[4]  Frank Stocklin,et al.  NASA’s global differential GPS system and the TDRSS augmentation service for satellites , 2004 .

[5]  Anne C. Long,et al.  Global Positioning System (GPS) Enhanced Orbit Determination Experiment (GEODE) on the Small Satellite Technology Initiative (SSTI)Lewis Spacecraft , 1996 .

[6]  B. Tapley,et al.  Statistical Orbit Determination , 2004 .

[7]  Penina Axelrad,et al.  Real-Time, Autonomous, Precise Orbit Determination Using GPS , 2001 .

[8]  Richard G. Mach,et al.  New, improved GPS: The legacy accuracy improvement initiative , 2006 .

[9]  John F. Raquet,et al.  Broadcast vs. precise GPS ephemerides: a historical perspective , 2002 .

[10]  Oliver Montenbruck,et al.  Performance comparison of semicodeless GPS receivers for LEO satellites , 2006 .

[11]  E. Hairer,et al.  Solving Ordinary Differential Equations I , 1987 .

[12]  Y. Menard,et al.  GRAS – Metop ’ s GPS-Based Atmospheric , 2000 .

[13]  E. Hairer,et al.  Solving Ordinary Differential Equations II , 2010 .

[14]  Oliver Montenbruck,et al.  GPS for Microsatellites – Status and Perspectives , 2008 .

[15]  Pierluigi Silvestrin,et al.  An Autonomous GNSS-based Orbit Determination System for Low-Earth Observation Satellites , 1995 .

[16]  Frank Stocklin,et al.  Extremely Accurate On-Orbit Position Accuracy Using NASA's Tracking and Data Relay Satalite System(TDRSS) , 2006 .

[17]  Yanming Feng,et al.  An Alternative Orbit Integration Algorithm for GPS-Based Precise LEO Autonomous Navigation , 2001, GPS Solutions.

[18]  Frank Stocklin,et al.  Extremely Accurate On-Orbit Position Accuracy using TDRSS , 2006 .

[19]  Bradford W. Parkinson,et al.  Global Positioning System , 1995 .

[20]  Bob E. Schutz,et al.  Orbit Determination Concepts , 2004 .

[21]  Oliver Montenbruck,et al.  Phoenix-XNS - A Miniature Real-Time Navigation System for LEO Satellites , 2006 .

[22]  Christian Jayles,et al.  DORIS-DIODE: Jason-1 has a Navigator on Board , 2004 .

[23]  Wolfgang Priester,et al.  TIME-DEPENDENT STRUCTURE OF THE UPPER ATMOSPHERE , 1962 .

[24]  Markus Rothacher,et al.  The International GPS Service (IGS): An interdisciplinary service in support of Earth sciences , 1999 .

[25]  E. Glenn Lightsey,et al.  Testing of the ICESat BlackJack GPS Receiver Engineering Model , 2002 .

[26]  T. Meehan,et al.  Toward decimeter-level real-time orbit determination: a demonstration using the SAC-C and CHAMP Spacecraft , 2002 .