TY - GEN
T1 - Near real time GPS orbit determination
T2 - 33rd Annual AAS Rocky Mountain Guidance and Control Conference
AU - Weiss, Jan P.
AU - Bertiger, Willy
AU - Desai, Shailen D.
AU - Haines, Bruce J.
AU - Lane, Christopher M.
PY - 2010
Y1 - 2010
N2 - We present strategies and results for near real-time (NRT) precise orbit determination (POD) of the Global Positioning System (GPS) constellation. The POD for the GPS constellation is performed using a global network of 40 ground stations. The resulting products are available with a latency of about one hour, and include orbit and clock estimates for the GPS satellites, as well as widelane phase bias information from the global solution. The widelane information, when used with the orbit and clock estimates, enables singlereceiver, ambiguity resolved GPS-based positioning. Comparisons to definitive final products from the Jet Propulsion Laboratory and International GNSS Service show that NRT orbit accuracies of 5 cm RMS (3D) and clock accuracies of 5 cm RMS are achieved. Daily point positioning of a variety of static ground station receivers using these products yields repeatabilities of 1 cm. An additional NRT process, in turn, utilizes the GPS orbit, clock, and widelane products to perform POD for the Ocean Surface Topography Mission (OSTM)/Jason-2 satellite, which carries an advanced dual-frequency "Blackjack" GPS receiver. The radial accuracy of the resulting OSTM/Jason-2 orbits is typically 1 cm (RMS) with a latency of 2 hours. These new orbit solutions provide the basis for computing accurate sea-surface height information for operational oceanographic and low-latency scientific applications of satellite altimeter data.
AB - We present strategies and results for near real-time (NRT) precise orbit determination (POD) of the Global Positioning System (GPS) constellation. The POD for the GPS constellation is performed using a global network of 40 ground stations. The resulting products are available with a latency of about one hour, and include orbit and clock estimates for the GPS satellites, as well as widelane phase bias information from the global solution. The widelane information, when used with the orbit and clock estimates, enables singlereceiver, ambiguity resolved GPS-based positioning. Comparisons to definitive final products from the Jet Propulsion Laboratory and International GNSS Service show that NRT orbit accuracies of 5 cm RMS (3D) and clock accuracies of 5 cm RMS are achieved. Daily point positioning of a variety of static ground station receivers using these products yields repeatabilities of 1 cm. An additional NRT process, in turn, utilizes the GPS orbit, clock, and widelane products to perform POD for the Ocean Surface Topography Mission (OSTM)/Jason-2 satellite, which carries an advanced dual-frequency "Blackjack" GPS receiver. The radial accuracy of the resulting OSTM/Jason-2 orbits is typically 1 cm (RMS) with a latency of 2 hours. These new orbit solutions provide the basis for computing accurate sea-surface height information for operational oceanographic and low-latency scientific applications of satellite altimeter data.
UR - https://www.scopus.com/pages/publications/80053370428
M3 - Conference contribution
AN - SCOPUS:80053370428
SN - 9780877035619
T3 - Advances in the Astronautical Sciences
SP - 439
EP - 451
BT - Guidance and Control 2010 - Advances in the Astronautical Sciences
Y2 - 5 February 2010 through 10 February 2010
ER -