TY - JOUR
T1 - From GPS-R to GNSS-R
T2 - Receiver Design for the Processing of Reflected Galileo Signals
AU - Juang, Jyh Ching
AU - Ma, Sheng Hsiung
AU - Tsai, Yung Fu
AU - Lin, Chen Tsung
N1 - Funding Information:
This work is supported by the National Space Organization (NSPO), Taiwan, under Grant NSPO-S-106123.
Publisher Copyright:
© 2018, The Aeronautical and Astronautical Society of the Republic of China. All right reserved.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The omnipresence global navigation satellite system (GNSS) signals have not only provided high accuracy navigation but also encouraged several remote sensing missions such as FORMOSAT-7 and FORMOSAT-7R. In a GNSS reflectometry mission, the reflected signals are processed to form delay Doppler maps (DDMs) so that the properties including roughness, ocean wind speed, and soil moisture can be retrieved. Currently, GPS reflectometry missions are realized by Surrey TDS-1 and NASA CYGNSS in which the reflected GPS signals are processed. One distinguishable feature of the FORMOSAT-7R GNSS reflectometry mission is its capability to process both GPS and Galileo reflected signals. Galileo signals are modulated through a binary-offset-carrier (BOC) scheme that is different from binary phase shift keying (BPSK) in GPS. Consequently, the receiver design is more complicated. In the paper, the design of the receiver for the processing of Galileo reflected signals is discussed. Several different realizations to perform BOC correlation processing are proposed and assessed in terms of implementation complexity and correlation loss. The results are verified through simulation and experiment.
AB - The omnipresence global navigation satellite system (GNSS) signals have not only provided high accuracy navigation but also encouraged several remote sensing missions such as FORMOSAT-7 and FORMOSAT-7R. In a GNSS reflectometry mission, the reflected signals are processed to form delay Doppler maps (DDMs) so that the properties including roughness, ocean wind speed, and soil moisture can be retrieved. Currently, GPS reflectometry missions are realized by Surrey TDS-1 and NASA CYGNSS in which the reflected GPS signals are processed. One distinguishable feature of the FORMOSAT-7R GNSS reflectometry mission is its capability to process both GPS and Galileo reflected signals. Galileo signals are modulated through a binary-offset-carrier (BOC) scheme that is different from binary phase shift keying (BPSK) in GPS. Consequently, the receiver design is more complicated. In the paper, the design of the receiver for the processing of Galileo reflected signals is discussed. Several different realizations to perform BOC correlation processing are proposed and assessed in terms of implementation complexity and correlation loss. The results are verified through simulation and experiment.
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U2 - 10.6125/JoAAA.201812_50(4).03
DO - 10.6125/JoAAA.201812_50(4).03
M3 - Article
AN - SCOPUS:85064484340
SN - 1990-7710
VL - 50
SP - 365
EP - 374
JO - Journal of Aeronautics, Astronautics and Aviation
JF - Journal of Aeronautics, Astronautics and Aviation
IS - 4
ER -