In this paper, a system that can collect GPS L1 C/A, GLONASS G1, and BDS B1I signals with single front-end receiver was implemented using a universal software radio peripheral (USRP) and its performance was verified. To acquire the global navigation satellite system signals, hardware was configured ...
In this paper, a system that can collect GPS L1 C/A, GLONASS G1, and BDS B1I signals with single front-end receiver was implemented using a universal software radio peripheral (USRP) and its performance was verified. To acquire the global navigation satellite system signals, hardware was configured using USRP, antenna, external low-noise amplifier, and external oscillator. In addition, a value of optimum local oscillator frequency was selected to sample signals from three systems with L1-band with a low sampling rate as much as possible. The comparison result of C/N0 between the signal collection system using the proposed method and commercial receiver using double front-end showed that the proposed system had 0.7 ~ 0.8dB higher than that of commercial receiver for GPS L1 C/A signals and 1 ~ 2 dB lower than that of commercial receiver for GLONASS G1 and BDS B1I. Through the above results, it was verified that signals collected using the three systems with a single USRP had no significant error with that of commercial receiver. In the future, it is expected that the proposed system will be combined with software-defined radio (SDR) and advanced to a receiver that has a re-configuration channel.
In this paper, a system that can collect GPS L1 C/A, GLONASS G1, and BDS B1I signals with single front-end receiver was implemented using a universal software radio peripheral (USRP) and its performance was verified. To acquire the global navigation satellite system signals, hardware was configured using USRP, antenna, external low-noise amplifier, and external oscillator. In addition, a value of optimum local oscillator frequency was selected to sample signals from three systems with L1-band with a low sampling rate as much as possible. The comparison result of C/N0 between the signal collection system using the proposed method and commercial receiver using double front-end showed that the proposed system had 0.7 ~ 0.8dB higher than that of commercial receiver for GPS L1 C/A signals and 1 ~ 2 dB lower than that of commercial receiver for GLONASS G1 and BDS B1I. Through the above results, it was verified that signals collected using the three systems with a single USRP had no significant error with that of commercial receiver. In the future, it is expected that the proposed system will be combined with software-defined radio (SDR) and advanced to a receiver that has a re-configuration channel.
It configured hardware by selecting antenna and amplifier in consideration of L1 band signals in the GPS, GLONASS, and BDS. In addition, it determined a LO frequency that minimized aliasing in consideration of USRP performance in order to acquire L1 band signals of three different systems as a single USRP. The GNSS signals acquired via the system implemented with the above method were quantized with 14 bit and stored in hard disks of personal computer (PC).
대상 데이터
The amplified RF signals were inputted via the USRP. The USRP used in this study was NI-USRP 2940R (National Instruments 2014). The USRP shall select a suitable daughter board to receive signals at a preferred band.
이론/모형
In order to select an appropriate LO frequency, the maximum sampling rate that can be set due to the limitations of the USRP and PC performance was selected first. Next, LO frequency was selected not to overlap the signals in the three systems as much as possible by taking the maximum sampling rate and Nyquist-Shannon sampling theory into consideration.
성능/효과
8 dB higher than that of commercial receiver for GPS L1 C/A signals and 1 ~ 2 dB lower than that of commercial receiver for GLONASS G1 and BDS B1I. The above results verified that GNSS signals of the three different systems collected via a single USRP were normal signals. In the future, the multi GNSS signal collection system based on USRP designed and implemented in this paper will be evolved into a receiver that has reconfiguration channels by combining the SDR.
The collected signals were demodulated with baseband signals through signal acquisition of parallel code space search mode and signal track process consisting of PLL and DLL and C/NO was estimated. The comparison result of C/N0 between the signal collection system using the proposed method and commercial receiver showed that the proposed system had 0.
The collected signals were demodulated with baseband signals through signal acquisition of parallel code space search mode and signal track process consisting of PLL and DLL and C/NO was estimated. The comparison result of C/N0 between the signal collection system using the proposed method and commercial receiver showed that the proposed system had 0.7 ~ 0.8 dB higher than that of commercial receiver for GPS L1 C/A signals and 1 ~ 2 dB lower than that of commercial receiver for GLONASS G1 and BDS B1I. The above results verified that GNSS signals of the three different systems collected via a single USRP were normal signals.
후속연구
The above results verified that GNSS signals of the three different systems collected via a single USRP were normal signals. In the future, the multi GNSS signal collection system based on USRP designed and implemented in this paper will be evolved into a receiver that has reconfiguration channels by combining the SDR.
참고문헌 (17)
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