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Detection and processing of bistatically reflected GPS signals from low Earth orbit for the purpose of ocean remote sensing

Detection and processing of bistatically reflected GPS signals from low Earth orbit for the purpose of ocean remote sensing
Detection and processing of bistatically reflected GPS signals from low Earth orbit for the purpose of ocean remote sensing
We will show that ocean-reflected signals from the global positioning system (GPS) navigation satellite constellation can be detected from a low-earth orbiting satellite and that these signals show rough correlation with independent measurements of the sea winds. We will present waveforms of ocean-reflected GPS signals that have been detected using the experiment onboard the United Kingdom's Disaster Monitoring Constellation satellite and describe the processing methods used to obtain their delay and Doppler power distributions. The GPS bistatic radar experiment has made several raw data collections, and reflected GPS signals have been found on all attempts. The down linked data from an experiment has undergone extensive processing, and ocean-scattered signals have been mapped across a wide range of delay and Doppler space revealing characteristics which are known to be related to geophysical parameters such as surface roughness and wind speed. Here we will discuss the effects of integration time, reflection incidence angle and examine several delay-Doppler signal maps. The signals detected have been found to be in general agreement with an existing model (based on geometric optics) and with limited independent measurements of sea winds; a brief comparison is presented here. These results demonstrate that the concept of using bistatically reflected global navigation satellite systems signals from low earth orbit is a viable means of ocean remote sensing.
bistatic radar, QuikSCAT, delay-Doppler mapping, global navigation satellite systems, GNSS, global positioning system, GPS, oceanography, reflectometry, satellite remote sensing
0196-2892
1229-1241
Gleason, S.
e9484dd2-afe4-4a1b-b671-9ace8d8b3c3a
Hodgart, S.
24686e7b-040f-44c9-b9a5-ce2f113dbc33
Sun, Y.
f9a339ca-9e03-4220-8df6-0c7ecf47c06c
Gommenginger, C.
f0db32be-34bb-44da-944b-c6b206ca4143
Mackin, S.
742c3cee-385a-4335-8f52-6bcedcae08dd
Adjrad, M.
be2bead5-2e22-4142-9469-87c7dffef422
Unwin, M.
63145863-7562-4ea3-b073-97f32e4cb7f7
Gleason, S.
e9484dd2-afe4-4a1b-b671-9ace8d8b3c3a
Hodgart, S.
24686e7b-040f-44c9-b9a5-ce2f113dbc33
Sun, Y.
f9a339ca-9e03-4220-8df6-0c7ecf47c06c
Gommenginger, C.
f0db32be-34bb-44da-944b-c6b206ca4143
Mackin, S.
742c3cee-385a-4335-8f52-6bcedcae08dd
Adjrad, M.
be2bead5-2e22-4142-9469-87c7dffef422
Unwin, M.
63145863-7562-4ea3-b073-97f32e4cb7f7

Gleason, S., Hodgart, S., Sun, Y., Gommenginger, C., Mackin, S., Adjrad, M. and Unwin, M. (2005) Detection and processing of bistatically reflected GPS signals from low Earth orbit for the purpose of ocean remote sensing. IEEE Transactions on Geoscience and Remote Sensing, 43 (6), 1229-1241. (doi:10.1109/TGRS.2005.845643).

Record type: Article

Abstract

We will show that ocean-reflected signals from the global positioning system (GPS) navigation satellite constellation can be detected from a low-earth orbiting satellite and that these signals show rough correlation with independent measurements of the sea winds. We will present waveforms of ocean-reflected GPS signals that have been detected using the experiment onboard the United Kingdom's Disaster Monitoring Constellation satellite and describe the processing methods used to obtain their delay and Doppler power distributions. The GPS bistatic radar experiment has made several raw data collections, and reflected GPS signals have been found on all attempts. The down linked data from an experiment has undergone extensive processing, and ocean-scattered signals have been mapped across a wide range of delay and Doppler space revealing characteristics which are known to be related to geophysical parameters such as surface roughness and wind speed. Here we will discuss the effects of integration time, reflection incidence angle and examine several delay-Doppler signal maps. The signals detected have been found to be in general agreement with an existing model (based on geometric optics) and with limited independent measurements of sea winds; a brief comparison is presented here. These results demonstrate that the concept of using bistatically reflected global navigation satellite systems signals from low earth orbit is a viable means of ocean remote sensing.

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More information

Published date: 2005
Keywords: bistatic radar, QuikSCAT, delay-Doppler mapping, global navigation satellite systems, GNSS, global positioning system, GPS, oceanography, reflectometry, satellite remote sensing

Identifiers

Local EPrints ID: 16139
URI: http://eprints.soton.ac.uk/id/eprint/16139
ISSN: 0196-2892
PURE UUID: 440fd9c8-ba13-49f7-83be-7d853578873c

Catalogue record

Date deposited: 17 Jun 2005
Last modified: 15 Mar 2024 05:46

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Contributors

Author: S. Gleason
Author: S. Hodgart
Author: Y. Sun
Author: C. Gommenginger
Author: S. Mackin
Author: M. Adjrad
Author: M. Unwin

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