scholarly journals Using GNSS Reflectometry Measurements Over the Everglades to Identify Variations in Wetland Inundation Extent Beneath Vegetation

2021 ◽  
Author(s):  
Brandi Downs ◽  
Andrew O'Brien ◽  
Mary Morris ◽  
Valery Zavorotny ◽  
Cinzia Zuffada
Keyword(s):  
Gnss Reflectometry ◽  
Inundation Extent

scholarly journals Dynamic Calibration of GPS Effective Isotropic Radiated Power for GNSS-Reflectometry Earth Remote Sensing

2021 ◽  
pp. 1-12
Author(s):  
Tianlin Wang ◽  
Christopher S. Ruf ◽  
Scott Gleason ◽  
Andrew J. O'Brien ◽  
Darren S. McKague ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Dynamic Calibration ◽  
Earth Remote Sensing ◽  
Radiated Power ◽  
Gnss Reflectometry

Wave Coherence in GNSS Reflectometry: A Signal Processing Point of View

2020 ◽  
Author(s):  
Ilaria M. Russo ◽  
Maurizio di Bisceglie ◽  
Carmela Galdi ◽  
Marco Lavalle ◽  
Cinzia Zuffada
Keyword(s):  
Signal Processing ◽  
Point Of View ◽  
Gnss Reflectometry ◽  
Processing Point

Inundation Extent and Flood Frequency Mapping Using LANDSAT Imagery and Digital Elevation Models

2009 ◽  
Vol 46 (1) ◽  
pp. 101-127 ◽  
Author(s):  
Shuhua Qi ◽  
Daniel G. Brown ◽  
Qing Tian ◽  
Luguang Jiang ◽  
Tingting Zhao ◽  
...  
Keyword(s):  
Landsat Imagery ◽  
Digital Elevation Models ◽  
Flood Frequency ◽  
Digital Elevation ◽  
Inundation Extent

scholarly journals From GPS Receiver to GNSS Reflectometry Payload Development for the Triton Satellite Mission

2021 ◽  
Vol 13 (5) ◽  
pp. 999
Author(s):  
Yung-Fu Tsai ◽  
Wen-Hao Yeh ◽  
Jyh-Ching Juang ◽  
Dian-Syuan Yang ◽  
Chen-Tsung Lin
Keyword(s):  
Satellite System ◽  
Low Earth Orbit ◽  
Export Control ◽  
Navigation Systems ◽  
Gps Receiver ◽  
Design Development ◽  
Satellite Mission ◽  
Essential Components ◽  
Gnss Reflectometry ◽  
Global Navigation Satellite

The global positioning system (GPS) receiver has been one of the most important navigation systems for more than two decades. Although the GPS system was originally designed for near-Earth navigation, currently it is widely used in highly dynamic environments (such as low Earth orbit (LEO)). A space-capable GPS receiver (GPSR) is capable of providing timing and navigation information for spacecraft to determine the orbit and synchronize the onboard timing; therefore, it is one of the essential components of modern spacecraft. However, a space-grade GPSR is technology-sensitive and under export control. In order to overcome export control, the National Space Organization (NSPO) in Taiwan completed the development of a self-reliant space-grade GPSR in 2014. The NSPO GPSR, built in-house, has passed its qualification tests and is ready to fly onboard the Triton satellite. In addition to providing navigation, the GPS/global navigation satellite system (GNSS) is facilitated to many remote sensing missions, such as GNSS radio occultation (GNSS-RO) and GNSS reflectometry (GNSS-R). Based on the design of the NSPO GPSR, the NSPO is actively engaged in the development of the Triton program (a GNSS reflectometry mission). In a GNSS-R mission, the reflected signals are processed to form delay Doppler maps (DDMs) so that various properties (including ocean surface roughness, vegetation, soil moisture, and so on) can be retrieved. This paper describes not only the development of the NSPO GPSR but also the design, development, and special features of the Triton’s GNSS-R mission. Moreover, in order to verify the NSPO GNSS-R receiver, ground/flight tests are deemed essential. Then, data analyses of the airborne GNSS-R tests are presented in this paper.

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