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Chapter 13, Space Applications

By E. Glenn Lightsey

GNSS receivers have become a standard sensor on nearly all Earth orbiting satellites, and often they are used for more than just navigation. Chapter 13 provides an overview of the issues involved in adapting a GNSS receiver to operate in space and reviews the most common space-based applications. It covers several aspects of space-based GNSS receiver operations and discusses the important issues that must be dealt with when operating a GNSS receiver on a spacecraft. Also discussed are specialized, including such diverse topics such as navigating with receivers in orbits above the GNSS constellation and determining a satellite's attitude with GNSS signals.

An Octave/MATLAB script is included to estimate the position of the GRACE satellite using raw measurements over a single orbit. The measurements from the Blackjack dual-frequency GPS receiver onboard both GRACE satellites are freely available on the Internet, and an example day-long data set has been included on the DVD as a demonstration. The data provided has been augmented to include the transmitting satellite positions and clock biases accomplished using IGS ephemeris files, GRACE online processing tools, the orbit interpolation code by NOAA, and a Python script to pull everything together, all included on the DVD. The estimated positions have been compared with the precise positions provided as part of the GRACE data download.



Estimate GRACE Satellite Positions and Velocity Using Processed Data
Python Tools for Augmenting GRACE Data for Position and Velocity Estimation
Example GRACE Data and Tools (28Mb)