Engineering topics
Bar-Sever, Y.
Publications and source records attributed to Bar-Sever, Y..
Aviation applications of NASA's global differential GPS system
In this article we describe the aviation applications of the system, and describe the extensive flight tests and the performance validation methodology.
New empirically-derived solar radiation pressure model for GPS satellites
Solar radiation pressure force is the second largest perturbation acting on GPS satellites, after the gravitational attraction from the Earth, Sun, and Moon. It is the largest error source in the modeling of GPS orbital dynamics.
Space applications of the NASA global differential GPS system
In this article we describe the developments in the third and last year of this effort, and discuss the current status of the system and its potential future evolution.
DORIS as a potential part of a global geodetic observing system
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DORIS as a potential part of a global geodetic observing system
We have processed all available DORIS data from all available satellites, except JASON over the past 10 years. Weekly solutions have been produced for stations positions coordinates, geocenter motion and scale factor stability. We present here the current accuracy presently achievable for all types of potential geodetic products.
New empirically-derived solar radiation pressure model for GPS satellites
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NASA's Global Differential GPS System
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Demonstration of decimeter-level real-time positioning of an airborne platform
We demonstrate the ability of the NASA Global Differential GPS System to support 10 to 20 cm accurate real-time airplane positioning, anywhere in the world, independent of local navigational aids or infrastructure.
TOPEX/JASON combined GPS/DORIS orbit determination in the tandem phase
This paper will present Jason-1 POD results obtained at JPL using the Gipsy-Oasis I1 (GOA). Results from standard tests (orbit overlaps, Laser control points) suggest that 1 to 2 cm radial orbit precision is already being achieved using the JPL reduced-dynamic filter approach. New DORIS POD strategies will be an emphasis of this paper.
GRACE: millimeters and microns in orbit
The Gravity Recovery and Climate Experiment launched March 17, 2002. The GPS data for this experiment are processed to contribute to the recover long wavelength gravity field; remove errors due to long term on-board oscillator drift; and align K/Ka-band measurments between the two spacecraft to 0.1 ns. This paper will concentrate on the use of GPS for these timing and calibration functions and will not address the recovery of the gravity field.
Recent tests of an Internet-based global differential GPS on NASA's DC-8 air SAR flights
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Quantifying the information content in GPS slant path delays
We quantify the amount of information on atmospheric water vapor that can be extracted from GPS line of sight measurement, by comparing these measurements to those made with acollocated pointed water vapor radiometer.
Global differential GPS on NASA's DC-8 AirSAR flights
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GPS-assisted GLONASS orbit determination
Using 1 week of data from a network of GPS/ GLONASS dual-tracking receivers, 15-cm accurate GLONASS orbit determination is demonstrated with an approach that combines GPS and GLONASS data.
Recent results and activities of the IGS analysis center at JPL
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Orbit determination of VSOP-2 with GPS measurements
The paper discusses orbit determination of VSOP-2 regarding GPS measurements.