In this study, to design a multi-GNSS receiver using single RF front-end, the receiving performances for various frequency plans were evaluated. For the fair evaluation and comparison of different frequency plans, the same signal needs to be received at the same time. For this purpose, two synchroni...
In this study, to design a multi-GNSS receiver using single RF front-end, the receiving performances for various frequency plans were evaluated. For the fair evaluation and comparison of different frequency plans, the same signal needs to be received at the same time. For this purpose, two synchronized RF front-ends were configured using USRP X310, and PC-based software was implemented so that the quality of the digital IF signal received at each front-end could be evaluated. The software consisted of USRP control, signal reception, signal acquisition, signal tracking, and C/N0 estimation function. Using the implemented software and USRP-based hardware, the signal receiving performances for various frequency plans, such as the signal attenuation status, overlapping of different systems, and the use of imaginary or real signal, were evaluated based on the C/N0 value. The results of the receiving performance measurement for the various frequency plans suggested in this study would be useful reference data for the design of a multi-GNSS receiver in the future.
In this study, to design a multi-GNSS receiver using single RF front-end, the receiving performances for various frequency plans were evaluated. For the fair evaluation and comparison of different frequency plans, the same signal needs to be received at the same time. For this purpose, two synchronized RF front-ends were configured using USRP X310, and PC-based software was implemented so that the quality of the digital IF signal received at each front-end could be evaluated. The software consisted of USRP control, signal reception, signal acquisition, signal tracking, and C/N0 estimation function. Using the implemented software and USRP-based hardware, the signal receiving performances for various frequency plans, such as the signal attenuation status, overlapping of different systems, and the use of imaginary or real signal, were evaluated based on the C/N0 value. The results of the receiving performance measurement for the various frequency plans suggested in this study would be useful reference data for the design of a multi-GNSS receiver in the future.
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문제 정의
Plan 3 was applied to front-end 0, and Plan 4 was applied to front-end 1. The purpose of this experiment was to compare the performances of the real and imaginary signals for BDS. Table 4 summarizes the results of the C/N0 comparison for the BDS satellites.
가설 설정
1) The overlapping of signals with another system showed better performance than the loss of signals due to bandwidth limitation.
2) There is no performance difference between the real and imaginary signals.
제안 방법
In the aforementioned study, the frequency plan was designed so that the three GNSS signals would not be overlapped for the maximum sampling rate that can be used in USRP and PC. If there are performance comparison data for various Intermediate frequency (IF) plans, (e.
In the experiment, the frequency plans for comparison were applied to front-end 0 and front-end 1, respectively, and signals were received for about 10 minutes. While receiving the signals, the C/N0 and the number of satellites were recorded every second.
In the first experiment, to examine the performance difference of each front-end, the same frequency plan was applied, and the C/N0 and the number of visible satellites were compared. Table 2 summarizes the results of the comparison.
In this study, the receiving performances for various frequency plans that can receive multi-GNSS signals using single RF front-end were measured and evaluated through an experiment. For the fair evaluation of two frequency plans, two synchronized front-ends were configured using USRP X310.
To examine and compare the receiving performances of the front-ends designed based on different frequency plans, the C/N0 of satellite signals and the number of visible satellites were measured using the algorithm of a software receiver. The digital IF signals of the two frontends inputted from USRP are entered to PC, and are stored in the memory.
In this regard, to measure the GNSS signal receiving performance, the Carrier to Noise Ratio (C/N0) of each satellite signal was estimated. Using this information, experiments were conducted for various frequency plans, and the results were compared and summarized.
이론/모형
Also, the C/N0 of the signal can be estimated using the in-phase correlation value and the quadrature-phase correlation value. In this study, the narrow wide power ratio (NWPR) technique was used as the method for estimating C/N0 (Falletti et al. 2010). Table 1 summarizes the detailed signal processing algorithm and parameter information.
The purpose of signal acquisition is to search the satellite signal that exists in the digital IF signal, and correlation calculation is performed for all the possible Doppler and code phase. In this study, the signal acquisition was implemented using the parallel code space search method that can reduce the computational load by searching the code phase in the frequency domain.
성능/효과
3. Table 5 compares the results of the reception for Plan 5 and Plan 4. In the case of GPS, the effect of intra-system noise due to the overlapping of the band was less than 0.1 dB. For BDS, part of the signal was lost as a 20 Msps sampling rate was used for Plan 4; and due to this problem, Plan 5 had a 2.
후속연구
Based on this, various frequency plans that can receive the GPS/GLONASS/BDS signals and a frequency plan that is appropriate for a software receiver that can efficiently receive the GPS/BDS signals using a low sampling rate were examined. The results of the experiment for the various frequency plans suggested in this study would be useful reference data for the development of a receiver that can receive multi-GNSS signals using single front-end in the future.
참고문헌 (11)
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Park, K. W., Lee, S., Lee, M. J., & Park, C. 2016b, Design of a buffer management algorithm for USRP based real-time GNSS SDR, in 2016 KGS conference, Nov 2016, Jeju, Korea
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