TY - JOUR
T1 - Designing a Dual-Frequency GPS FPGA Altimeter with Optimized Open-Loop Tracking and Cross-Path Calibration
AU - Huang, Kuan Ying
AU - Juang, Jyh Ching
AU - Lin, Chen Tsung
AU - Tsai, Yung Fu
AU - Yang, Dian Syuan
N1 - Funding Information:
The authors thank to support from Editor and Reviewers. This research is supported by the National Space Organization, under grant NSPO - S -109 032 and NSPO-S -110 056.
Publisher Copyright:
© 2021, The Aeronautical and Astronautical Society of the Republic of China. All right reserved.
PY - 2021/12
Y1 - 2021/12
N2 - To achieve fast and large-scale monitoring of global sea surface heights (SSH), we designed a Global Navigation Satellite System (GNSS) altimeter with in-loop optimization. By measuring the delays between the reflected and direct GNSS signals, we were able to calculate the sea surface height. In Global Positioning System (GPS) altimetry, receivers must collect reflected GNSS signals from the ocean surface. However, this can be affected by high mobility issues and weak received signal power. Therefore, we adopted an open-loop tracking strategy along with optimized loop filtering on the Field Programmable Gate Array (FPGA) altimeter to overcome these limitations. In addition, further dual-frequency GPS signal processing was applied in order to conduct the proposed cross-path ionospheric error calibration, achieving a better ranging performance. To verify the effectiveness of the proposed altimeter, flight tests using a Gulfstream Jet were conducted; the real-time performance is demonstrated.
AB - To achieve fast and large-scale monitoring of global sea surface heights (SSH), we designed a Global Navigation Satellite System (GNSS) altimeter with in-loop optimization. By measuring the delays between the reflected and direct GNSS signals, we were able to calculate the sea surface height. In Global Positioning System (GPS) altimetry, receivers must collect reflected GNSS signals from the ocean surface. However, this can be affected by high mobility issues and weak received signal power. Therefore, we adopted an open-loop tracking strategy along with optimized loop filtering on the Field Programmable Gate Array (FPGA) altimeter to overcome these limitations. In addition, further dual-frequency GPS signal processing was applied in order to conduct the proposed cross-path ionospheric error calibration, achieving a better ranging performance. To verify the effectiveness of the proposed altimeter, flight tests using a Gulfstream Jet were conducted; the real-time performance is demonstrated.
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U2 - 10.6125/JoAAA.202112_53(4).07
DO - 10.6125/JoAAA.202112_53(4).07
M3 - Article
AN - SCOPUS:85127533838
SN - 1990-7710
VL - 53
SP - 535
EP - 546
JO - Journal of Aeronautics, Astronautics and Aviation
JF - Journal of Aeronautics, Astronautics and Aviation
IS - 4
ER -