Mitigation of Adaptive Antenna Induced Bias Errors in GNSS Receivers. - Andrew J. O'Brien 001; Inder J. Gupta (IEEE Trans. Aerosp. Electron. Syst., 2011)

Real-time estimation of ocean wave fields from marine radar data. - David R. Lyzenga; Okey G. Nwogu; Robert F. Beck; Andrew O'Brien 001; Joel T. Johnson; Tony de Paolo; Eric Terrill (IGARSS, 2015)

The CubeSat Radiometer Radio Frequency Interference Technology Validation (CubeRRT) mission. - Joel T. Johnson; Chi-Chih Chen; Andrew O'Brien 001; Graeme E. Smith; Christa McKelvey; Mark J. Andrews; Christopher D. Ball; Sidharth Misra; Shannon T. Brown; Jonathan Kocz; Robert Jarnot; Damon C. Bradley; et al. (IGARSS, 2016)

Studies of TDS-1 GNSS-R ocean altimetry using a "full DDM" retrieval approach. - Jeonghwan Park 001; Joel T. Johnson; Andrew O'Brien 001; Stephen T. Lowe (IGARSS, 2016)

Small and Adaptive Antennas and Arrays for GNSS Applications. - John L. Volakis; Andrew J. O'Brien 001; Chi-Chih Chen (Proc. IEEE, 2016)

Calibration and Unwrapping of the Normalized Scattering Cross Section for the Cyclone Global Navigation Satellite System. - Scott Gleason 001; Christopher S. Ruf; Maria Paola Clarizia; Andrew J. O'Brien 001 (IEEE Trans. Geosci. Remote. Sens., 2016)

Development of the cubesat radiometer radio frequency interference technology validation (cuberrt) system. - Christopher D. Ball; Chi-Chih Chen; Andrew O'Brien 001; Graeme E. Smith; Christa McKelvey; Mark J. Andrews; Joseph Landon Garry; Joel T. Johnson; Sidharth Misra; Shannon T. Brown; Robert Jarnot; Jonathan Kocz; et al. (IGARSS, 2017)

Investigation of spaceborne polarimetric GNSS-R using the SMAP radar instrument. - Matthew Buchanan; Andrew O'Brien 001 (IGARSS, 2017)

Calibration and validation of the cygnss level 1 data products. - Scott Gleason 001; Christopher Ruf; Maria Paola Clarizia; Joel T. Johnson; Andrew O'Brien 001; Paul S. Chang; Zorana Jelenak; Faozi Said; Seubson Soisuvarn (IGARSS, 2017)

Comparing the cygnss simulator forward scattering model with TDS-1 and cygnss on-orbit DDMS. - Andrew O'Brien 001; Joel T. Johnson (IGARSS, 2017)

Investigating "rapid revisit" observations of cygnss. - Jeonghwan Park 001; Joel T. Johnson; Andrew O'Brien 001; Yuchan Yi (IGARSS, 2017)

GNSS-R Time-Series Soil Moisture Retrievals from Vegetated Surfaces. - Muhammad A. Al-Khaldi; Joel T. Johnson; Andrew O'Brien 001; Francesco Mattia; Anna Balenzano (IGARSS, 2018)

Investigation of Spaceborne Polarimetric GNSS-R Over Land Using the Smap Radar Receiver. - Matthew Buchanan; Andrew O'Brien 001; Joel T. Johnson (IGARSS, 2018)

Detection & Separation of Coherent Reflections in GNSS-R Measurements Using CYGNSS Data. - Eric Loria; Andrew O'Brien 001; Inder J. Gupta (IGARSS, 2018)

A Comparison of Waveform Model Re-Tracking Methods Using Data from CYGNSS. - Jake Mashburn; Andrew O'Brien 001; Penina Axelrad; Cinzia Zuffada; Stephen T. Lowe; Rashmi Shah; Alexander G. Voronovich; Valery U. Zavorotny (IGARSS, 2018)

Testing and Operation Planning of the Cubesat Radiometer Radio Frequency Interference Technology Validation (Cuberrt) System. - Christa McKelvey; Christopher D. Ball; Chi-Chih Chen; Andrew O'Brien 001; Graeme E. Smith; Mark J. Andrews; Joseph Landon Garry; Joel T. Johnson; Sidharth Misra; Shannon T. Brown; Robert Jarnot; Rudi Bendig; et al. (IGARSS, 2018)

CubeSat Radiometer Radio Frequency Interference Technology (CubeRRT) Validation Mission: Enabling Future Resource-Constrained Science Missions. - Sidharth Misra; Shannon T. Brown; Robert Jarnot; Carl Felten; Rudi Bendig; Jonathan Kocz; Christa McKelvey; Christopher D. Ball; Chi-Chih Chen; Andrew O'Brien 001; Graeme E. Smith; Mark J. Andrews; et al. (IGARSS, 2018)

Comparison of Wide Bandwidth Conventional and Interferometric GNSS-R Techniques for Possible CYGNSS Follow-On Mission. - Rachel Norris; Chris Ruf; Eric Loria; Andrew O'Brien 001 (IGARSS, 2018)

Fully Adaptive Remote Sensing Observing System Simulation Experiments. - Graeme E. Smith; Adam E. Mitchell; Christopher D. Ball; Andrew O'Brien 001; Joel T. Johnson (IGARSS, 2018)

Assessing the Altimetric Measurement from CYGNSS Data. - Cinzia Zuffada; Bruce J. Haines; George Hajj; Zhijin Li; Stephen T. Lowe; Rashmi Shah; Jake Mashburn; Penina Axelrad; Andrew O'Brien 001; Paolo Cipollini; Valery U. Zavorotny; Alexander G. Voronovich (IGARSS, 2018)

Exploiting Terrestrial Positioning Signals to Enable a Low-Cost Passive Radar. - Václav Navrátil; Joseph Landon Garry; Andrew J. O'Brien 001; Graeme E. Smith (IEEE Trans. Aerosp. Electron. Syst., 2018)

Fully Adaptive Cloud Profiling Radar Simulation. - Jakob DeLong; Mohammad Abu Shattal; Andrew O'Brien 001; Christopher D. Ball; Joel T. Johnson; Graeme E. Smith (IGARSS, 2019)

Open Source Software for Simulating Collaborative Networks of Autonomous Adaptive Sensors. - Ryan Linnabary; Andrew O'Brien 001; Graeme E. Smith; Christopher D. Ball; Joel T. Johnson (IGARSS, 2019)

Towards An Ocean Altimetry Product Using Cygnss. - Eric Loria; Jake Mashburn; Andrew O'Brien 001; Penina Axelrad; Cinzia Zuffada; Zhijin Li (IGARSS, 2019)

Analysis of Wetland Extent Retrieval Accuracy Using Cygnss. - Eric Loria; Andrew O'Brien 001; Valery U. Zavorotny; Marco Lavalle; Clara C. Chew; Rashmi Shah; Cinzia Zuffada (IGARSS, 2019)

A Real-Time EIRP Level 1 Calibration Algorithm for the CYGNSS Mission Using the Zenith Measurements. - Tianlin Wang; Christopher Ruf; Scott Gleason 001; Bruce P. Block; Darren McKague; Andrew O'Brien 001 (IGARSS, 2019)

The CYGNSS Level 1 Calibration Algorithm and Error Analysis Based on On-Orbit Measurements. - Scott Gleason 001; Christopher S. Ruf; Andrew J. O'Brien 001; Darren S. McKague (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2019)

Using "Rapid Revisit" CYGNSS Wind Speed Measurements to Detect Convective Activity. - Jeonghwan Park 001; Joel T. Johnson; Yuchan Yi; Andrew J. O'Brien 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2019)

Comparison of Maximum-Likelihood Estimation and Other Methods for Clutter Doppler Centroid Estimation. - Shanka N. Wijesundara; Kristine L. Bell; Graeme E. Smith; Andrew O'Brien 001; Joel T. Johnson (IEEE Trans. Aerosp. Electron. Syst., 2019)

Time-Series Retrieval of Soil Moisture Using CYGNSS. - Mohammad M. Al-Khaldi; Joel T. Johnson; Andrew J. O'Brien 001; Anna Balenzano; Francesco Mattia (IEEE Trans. Geosci. Remote. Sens., 2019)

Sequential Processing of GNSS-R Delay-Doppler Maps to Estimate the Ocean Surface Wind Field. - Feixiong Huang; James L. Garrison; Nereida Rodriguez-Alvarez; Andrew J. O'Brien 001; Kaitie M. Schoenfeldt; Soon Chye Ho; Han Zhang 045 (IEEE Trans. Geosci. Remote. Sens., 2019)

The GRSS Standard for GNSS-Reflectometry. - Hugo Carreno-Luengo; Adriano Camps; Nicolas Flouri; Manuel Martín-Neira; Chris Ruf; Tianlin Wang; Siri Jodha S. Khalsa; Maria Paola Clarizia; Jennifer Reynolds; Joel T. Johnson; Andrew O'Brien 001; Carmela Galdi; et al. (IGARSS, 2020)

Improved Orbit Determination of the CYGNSS Satellites and its Application to GNSS-R Ocean Altimetry. - Alex Conrad; Penina Axelrad; Cinzia Zuffada; Bruce J. Haines; Andrew O'Brien 001; Eric Loria (IGARSS, 2020)

Simulation Study of Cygnss Observability of Dynamic Inundation Events. - Brandi Downs; Eric Loria; Andrew O'Brien 001; Valery U. Zavorotny; Cinzia Zuffada (IGARSS, 2020)

Analysis of GNSS-R Coverage by a Regional Aircraft Fleet. - Ryan Linnabary; Andrew O'Brien 001; Chris Ruf; Stephen B. Musko; Delwyn Moller (IGARSS, 2020)

An Adaptive Integration Algorithm for Improved Coherent Reflection Measurement in GNSS-R Instruments. - Eric Loria; Andrew O'Brien 001 (IGARSS, 2020)

Wind Vector and Wave Height Retrieval in Inland Waters Using CYGNSS. - Eric Loria; Andrew O'Brien 001; Valery U. Zavorotny; Cinzia Zuffada (IGARSS, 2020)

Next Generation GNSS-R Instrument. - Christopher Ruf; Roger Backhus; Timothy Butler; Chi-Chih Chen; Scott Gleason 001; Eric Loria; Darren McKague; Ryan Miller; Andrew O'Brien 001; Line van Nieuwstadt (IGARSS, 2020)

Monitoring GPS Eirp for Cygnss Level 1 Calibration. - Tianlin Wang; Christopher Ruf; Scott Gleason 001; Darren McKague; Andrew O'Brien 001; Bruce P. Block (IGARSS, 2020)

Investigation of Coherent and Incoherent Scattering from Lakes Using Cygnss Observations. - Valery U. Zavorotny; Eric Loria; Andrew O'Brien 001; Brandi Downs; Cinzia Zuffada (IGARSS, 2020)

Geolocation, Calibration and Surface Resolution of CYGNSS GNSS-R Land Observations. - Scott Gleason 001; Andrew O'Brien 001; Anthony Russel; Mohammad M. Al-Khaldi; Joel T. Johnson (Remote. Sens., 2020)

Real-Time Detection and Filtering of Radio Frequency Interference Onboard a Spaceborne Microwave Radiometer: The CubeRRT Mission. - Joel T. Johnson; Christopher D. Ball; Chi-Chih Chen; Christa McKelvey; Graeme E. Smith; Mark J. Andrews; Andrew O'Brien 001; Joseph Landon Garry; Sidharth Misra; Rudi Bendig; Carl Felten; Shannon T. Brown; et al. (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2020)

Improved GNSS-R Ocean Surface Altimetry With CYGNSS in the Seas of Indonesia. - Jake Mashburn; Penina Axelrad; Cinzia Zuffada; Eric Loria; Andrew O'Brien 001; Bruce J. Haines (IEEE Trans. Geosci. Remote. Sens., 2020)

Water Depth Retrieval in the Everglades Using Cygnss. - Brandi Downs; Andrew O'Brien 001; Mary Morris; Cinzia Zuffada (IGARSS, 2021)

Operational Airborne GNSS-R Aboard Air New Zealand Domestic Aircraft. - Delwyn Moller; Chris Ruf; Ryan Linnabary; Andrew O'Brien 001; Stephen B. Musko (IGARSS, 2021)

Overcoming the Current Limitations of GNSS-R Observation of Wetlands and Surface Water. - Andrew O'Brien 001; Eric Loria (IGARSS, 2021)

The Important Role of Antenna Pattern Characterization in the Absolute Calibration of GNSS-R Measurements. - Tianlin Wang; Christopher Ruf; Darren McKague; Anthony Russel; Andrew O'Brien 001; Scott Gleason 001 (IGARSS, 2021)

State of the Art in GNSS-R Capabilities Over Inland Waters. - Cinzia Zuffada; Brandi Downs; Ilaria Mara Russo; Eric Loria; Andrew O'Brien 001; Carmela Galdi; Maurizio di Bisceglie; Valery U. Zavorotny; Marco Lavalle; Mary Morris (IGARSS, 2021)

The IEEE-SA Working Group on Spaceborne GNSS-R: Scene Study. - Hugo Carreno-Luengo; Adriano Camps; Chris Ruf; Nicolas Floury; Manuel Martín-Neira; Tianlin Wang; Siri Jodha S. Khalsa; Maria Paola Clarizia; Jennifer Reynolds; Joel T. Johnson; Andrew O'Brien 001; Carmela Galdi; et al. (IEEE Access, 2021)

An Algorithm for Detecting Coherence in Cyclone Global Navigation Satellite System Mission Level-1 Delay-Doppler Maps. - Mohammad M. Al-Khaldi; Joel T. Johnson; Scott Gleason 001; Eric Loria; Andrew J. O'Brien 001; Yuchan Yi (IEEE Trans. Geosci. Remote. Sens., 2021)

Computing Specular Points Over Complex Land Surfaces for Airborne GNSS-R Applications. - Xiaoyou Lin; Delwyn Moller; Andrew O'Brien 001; Ryan Linnabary; Chris Ruf (IGARSS, 2022)

Modeling GNSS-R Coherent Scattering from Surface Waters with Wind, Waves, and Vegetation. - Eric Loria; Cinzia Zuffada; Andrew O'Brien 001 (IGARSS, 2022)

Rongowai: A Pathfinder NASA/NZ GNSS-R Initiative Supporting SDG-15 - Life on Land. - Delwyn Moller; Matthew Wilson; Rajasweta Datta; Andrew O'Brien 001; Ryan Linnabary; Chris Ruf (IGARSS, 2022)

CYGNSS Flood Applications to Support the United Nations Sustainable Development Goals. - Brandi Wilson-Downs; Albert J. Kettner; G. Robert Brakenridge; Andrew O'Brien 001; Cinzia Zuffada (IGARSS, 2022)

Retrieval of Dynamic Changes of Surface Water Extent from Sparse GNSS-R Measurements Using a Model-Driven Approach. - Brandi Wilson-Downs; Andrew O'Brien 001; Cinzia Zuffada (IGARSS, 2022)

Comparison of SAR and CYGNSS Surface Water Extent Metrics. - Bruce D. Chapman; Ilaria Mara Russo; Carmela Galdi; Mary Morris; Maurizio di Bisceglie; Cinzia Zuffada; Brandi Downs; Marco Lavalle; Eric Loria; Andrew J. O'Brien 001 (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2022)

Dynamic Calibration of GPS Effective Isotropic Radiated Power for GNSS-Reflectometry Earth Remote Sensing. - Tian-Lin Wang; Christopher S. Ruf; Scott Gleason 001; Andrew J. O'Brien 001; Darren S. McKague; Bruce P. Block; Anthony Russel (IEEE Trans. Geosci. Remote. Sens., 2022)

Assessing the Relative Performance of GNSS-R Flood Extent Observations: Case Study in South Sudan. - Brandi Downs; Albert J. Kettner; Bruce D. Chapman; G. Robert Brakenridge; Andrew J. O'Brien 001; Cinzia Zuffada (IEEE Trans. Geosci. Remote. Sens., 2023)

Comparison of GNSS-R Coherent Reflection Detection Algorithms Using Simulated and Measured CYGNSS Data. - Eric Loria; Ilaria Mara Russo; Yang Wang 072; Generoso Giangregorio; Carmela Galdi; Maurizio di Bisceglie; Brandi Wilson-Downs; Marco Lavalle; Andrew J. O'Brien 001; Y. Jade Morton; Cinzia Zuffada (IEEE Trans. Geosci. Remote. Sens., 2023)

Calibration of the Airborne Polarimetric GNSS-R Sensor for the Rongowai Project. - Dinan Bai; Chris Ruf; Andrew O'Brien 001; Delwyn Moller (IGARSS, 2024)

Measurement of GPS Antenna Gain Patterns for CYGNSS Using a Spaceborne Antenna Range. - Tianlin Wang; Christopher S. Ruf; Andrew O'Brien 001; Scott Gleason 001; Darren S. McKague; Bruce P. Block; Anthony Russel (IEEE Trans. Aerosp. Electron. Syst., 2024)