SNR degradation in GNSS-R measurements under the effects of radio-frequency interference

January 1, 2016·
Jorge Querol
,
A. Alonso-Arroyo
,
R. Onrubia
,
Daniel Pascual
,
Hyuk Park
,
Adriano Camps
· 1 min read
DOI
Abstract
Radio-frequency interference (RFI) is a serious threat for systems working with low power signals such as those coming from the global navigation satellite systems (GNSS). The spectral separation coefficient (SSC) is the standard figure of merit to evaluate the signal-to-noise ratio (SNR) degradation due to the RFI. However, an in-depth assessment in the field of GNSS-Reflectometry (GNSS-R) has not been performed yet, and particularly, about which is the influence of the RFI on the so-called delay-Doppler map (DDM). This paper develops a model that evaluates the contribution of intra-/inter-GNSS and external RFI effects to the degradation of the SNR in the DDM for both conventional and interferometric GNSS-R techniques. Moreover, a generalized SSC is defined to account for the effects of nonstationary RFI signals. The results show that highly directive antennas are necessary to avoid interference from other GNSS satellites, whereas mitigation techniques are essential to keep GNSS-R instruments working under external RFI degradation.
Type
Publication
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
publication

Abstract & Overview

Radio-frequency interference (RFI) is a serious threat for systems working with low power signals such as those coming from the global navigation satellite systems (GNSS). The spectral separation coefficient (SSC) is the standard figure of merit to evaluate the signal-to-noise ratio (SNR) degradation due to the RFI. However, an in-depth assessment in the field of GNSS-Reflectometry (GNSS-R) has not been performed yet, and particularly, about which is the influence of the RFI on the so-called delay-Doppler map (DDM). This paper develops a model that evaluates the contribution of intra-/inter-GNSS and external RFI effects to the degradation of the SNR in the DDM for both conventional and interferometric GNSS-R techniques. Moreover, a generalized SSC is defined to account for the effects of nonstationary RFI signals. The results show that highly directive antennas are necessary to avoid interference from other GNSS satellites, whereas mitigation techniques are essential to keep GNSS-R instruments working under external RFI degradation.

Publication Metadata

  • Authors: Jorge Querol, A. Alonso-Arroyo, R. Onrubia, Daniel Pascual, Hyuk Park, Adriano Camps
  • Venue: IEEE Journal of Selected Topics in Applied Earth Observations and Remote (2016)
  • Research Areas: JCAS & Earth Observation, RFI Mitigation & GNSS Security, GNSS & Positioning
  • DOI: 10.1109/jstars.2016.2597438
JCAS & Earth Observation RFI Mitigation & GNSS Security GNSS & Positioning