Crosstalk statistics and impact in interferometric GNSS-R

January 1, 2016·
Daniel Pascual
,
Hyuk Park
,
R. Onrubia
,
A. Alonso-Arroyo
,
Jorge Querol
,
Adriano Camps
· 1 min read
DOI
Abstract
This paper presents a statistical analysis of the crosstalk phenomenon in interferometric Global Navigation Satellite Systems Reflectometry (iGNSS-R). Crosstalk occurs when the Delay-Doppler Map (DDM) of a tracked satellite overlaps others from undesired satellites. This study is performed for ground-based and airborne receivers and for a receiver onboard the International Space Station (ISS) such as the upcoming GNSS Reflectometry, Radio Occultation and Scatterometry onboard ISS experiment. Its impact on ocean altimetry retrievals is analyzed for different antenna arrays. Results show that for elevation angles higher than 60°, crosstalk can be almost permanent from ground, up to 61% from airborne receivers at 2-km height, and up to ~10% at the ISS. Crosstalk can only be mitigated using highly directive antennas with narrow beamwidths. Crosstalk impact using a seven-element hexagonal array still induces large errors on ground, but reduces to centimeter level on airborne receivers, and is negligible from the ISS.
Type
Publication
IEEE journal of selected topics in applied earth observations and remote sensing
publication

Abstract & Overview

This paper presents a statistical analysis of the crosstalk phenomenon in interferometric Global Navigation Satellite Systems Reflectometry (iGNSS-R). Crosstalk occurs when the Delay-Doppler Map (DDM) of a tracked satellite overlaps others from undesired satellites. This study is performed for ground-based and airborne receivers and for a receiver onboard the International Space Station (ISS) such as the upcoming GNSS Reflectometry, Radio Occultation and Scatterometry onboard ISS experiment. Its impact on ocean altimetry retrievals is analyzed for different antenna arrays. Results show that for elevation angles higher than 60°, crosstalk can be almost permanent from ground, up to 61% from airborne receivers at 2-km height, and up to ~10% at the ISS. Crosstalk can only be mitigated using highly directive antennas with narrow beamwidths. Crosstalk impact using a seven-element hexagonal array still induces large errors on ground, but reduces to centimeter level on airborne receivers, and is negligible from the ISS.

Publication Metadata

  • Authors: Daniel Pascual, Hyuk Park, R. Onrubia, A. Alonso-Arroyo, Jorge Querol, Adriano Camps
  • Venue: IEEE journal of selected topics in applied earth observations and remote (2016)
  • Research Areas: JCAS & Earth Observation, GNSS & Positioning
  • DOI: 10.1109/jstars.2016.2551981
JCAS & Earth Observation GNSS & Positioning