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| Title: | A Demonstration of L2C Tracking from Space for Atmospheric Occultation |
| Author: | T.K. Meehan, Chi O. Ao, Byron Iijima, David Robison, Doug Hunt, Christian Rocken, Bill Schreiner, Sergey Sokolovskiy |
| Meeting: |
Proceedings of the 21st International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2008)
September 16 - 19, 2008
Savannah International Convention Center
Savannah, GA
|
| Page(s): | 698 - 701 |
| Cite this article: | Meehan, T.K., Ao, Chi O., Iijima, Byron, Robison, David, Hunt, Doug, Rocken, Christian, Schreiner, Bill, Sokolovskiy, Sergey, "A Demonstration of L2C Tracking from Space for Atmospheric Occultation," Proceedings of the 21st International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 698-701. |
| Abstract: | The new GPS L2C modulation is important for scientific
GPS data users who require high-precision ionospherefree
phase measurements when access to the decrypted L2P
modulation is not available. The IGOR GPS receiver, built by
Broad Reach Engineering, has software radio features that allow
re-programming of some signal processing functions. Engineers
at JPL working with scientists at JPL and UCAR remotely modified
the IGOR payload on one of the COSMIC weather satellites.
The COSMIC satellite constellation, operated by the Taiwanese
space agency, NSPO, comprises six small satellites, each operating
an IGOR GPS receiver built by Broad Reach Engineering.
The main purpose of the IGOR is to produce 50 Hz L1 and L2
phase and amplitude science observations as GPS signals rise and
set through the Earth's atmosphere. These signals are greatly
attenuated by de-focusing due to strong refraction in the lower
atmosphere, so SNR can be very weak. Initial processing of the
L2C data from the COSMIC mission shows much significant
improvement in the depth of penetration of the L2C signal allows
compared to L2P observations with a code enhanced technique.
We will show early on-orbit tracking results and discuss scientific
implications for use of this data on the COSMIC Radio Occultation
Mission. |
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