Next Article in Journal
Deep Learning for Soil and Crop Segmentation from Remotely Sensed Data
Previous Article in Journal
Mapping Crop Residue by Combining Landsat and WorldView-3 Satellite Imagery
Previous Article in Special Issue
Establishment and Assessment of a New GNSS Precipitable Water Vapor Interpolation Scheme Based on the GPT2w Model
Open AccessTechnical Note

A Real-Time On-Orbit Signal Tracking Algorithm for GNSS Surface Observations

COSMIC Group, The University Corporation for Atmospheric Research, Boulder, CO 80301, USA
Remote Sens. 2019, 11(16), 1858; https://doi.org/10.3390/rs11161858
Received: 25 June 2019 / Revised: 3 August 2019 / Accepted: 6 August 2019 / Published: 9 August 2019
(This article belongs to the Special Issue GPS/GNSS for Earth Science and Applications)
  |  
PDF [3596 KB, uploaded 9 August 2019]
  |  

Abstract

This manuscript describes real-time on-orbit instrument compatible open loop signal tracking techniques for Global Navigation Satellite Systems (GNSS) reflection observations. All GNSS-reflection (GNSS-R) satellite instruments require algorithms which run in real-time on-board the satellite, that are capable of predicting the code phase time delay and Doppler frequency of surface reflected signals. The algorithms presented here are for open loop tracking techniques in reflected GNSS signals for the purposed of making surface remote sensing observations. Initially, the algorithms are demonstrated using high resolution sampled data from the NASA Cyclone GNSS (CYGNSS) mission over ocean and land surfaces. Subsequently. the algorithm performance over ocean regions is analyzed in detail using a larger data set. As part of the analysis, the algorithm is assessed for its speed of convergence, to demonstrate general compatibility with spacecraft instrument processing limitations. Results indicate that over ocean regions is it possible to robustly predict in real time the Doppler frequency and code phase time delay of multiple reflected signal to sufficient precision to make science observations of the scattering surface. These algorithms are intended to provide a baseline technique and variations from which the scientific community can design more specialized algorithms for individual applications. View Full-Text
Keywords: GPS; GNSS; GNSS-R; reflectometry; spacecraft remote sensing; radar; signal tracking GPS; GNSS; GNSS-R; reflectometry; spacecraft remote sensing; radar; signal tracking
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Gleason, S. A Real-Time On-Orbit Signal Tracking Algorithm for GNSS Surface Observations. Remote Sens. 2019, 11, 1858.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Remote Sens. EISSN 2072-4292 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top