Inside GNSS Media & Research

NOV-DEC 2018

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56 InsideGNSS N O V E M B E R / D E C E M B E R 2 0 1 8 www.insidegnss.com jamming, spoofing, or other interfer- ence for existing GNSS signals as well as for developing potential new GNSS signals. Furthermore, the extension to multiple ground stations to allow real- time UAVlite position determination without multistation is straightfor- ward thanks to the WR synchroniza- tion technology. In the future we want to further improve the testbed and use the infra- structure for testing navigation message authentication (NMA) as well as spread- ing code authentication (SCA) methods. Furthermore, we want to use the test- bed to validate the benefit of the Galileo PRS service compared to the Galileo OS. Testing promising future GNSS signal structures is also in the planning. On a bigger time scale, the expansion to mul- tiple UAVlites and multiple receiving antennas is envisaged. Manufacturers T he sof t wa re def i ned r a d i o r e c o n f i g u r a b l e device used in the Pseu- dolite (Transmitter) sec- tion is a SDR USRP 2950R from National Instru- ments, Aust i n, Texas. Also, the virtual bench with a customized appli- cation program that was used to measure the time difference between the clocks of the WR-LENs was the VB-8054 from National Instruments. In Receiver System where the authors state that the UAVlite signals as well as the signals in space (SIS) are captured, t hey a re done so w it h t wo Trimble Zephy r 2 Geodetic antennas from Trimble, Sunnyvale, CA. Also in the Receiver Sec- tion, IFEN multi-GNSS software receiver front- end s (FE) f rom IFE N GmbH, Poing, Germany, are used; the SX3 Dual- R F-FE (D-FE) and t he SX3 Single-RF-FE (S-FE). I n Posit ion i ng a nd Range Verification, the aut hor s a re re fer r i ng specifically to the Mul- t i S t a t i on M S 6 0 f r om Leica Geosystems, Heer- brugg, Switzerland. T he GNS S receiver used in t he Front-end Clock Synchronization section is the PolaRx4TR from Septentrio, Leuven, Belgium and Torrance, CA. T h e d r o n e r e f e r e n c e d i n t h e UAV sec t ion is t he DJ I Spread i ng Wings S1000+ Octocopter from DJI, Shenzhen, China. Acknowledgments and Disclaimer Acknowledgement should go to Gerhard Kestel, Stephan Ullrich, and Mathias Philips-Blum for their support during the measurement campaigns and their work WORKING PAPERS FIGURE 12 ∆PR if Code a) and Phase b) of UAVlite CBOC with C/N 0 ~52dB-Hz, recorded by D-FE1 and D-FE2 (same clock; no external clock sync.). The top plots show ∆PR(t) and ∆GR(t) (UAVlite movement measured by MS60). The bottom plots show the difference of ∆PR – ∆GR = ε 1 - ε 2 Time [s] 60 100 140 180 220 Time [s] 60 100 140 180 220 Time [s] 60 100 140 180 220 Time [s] 60 100 140 180 220 3 2 1 0 –1 ∆ Range [m] 1 0 –1 –2 δ ∆ Range [m] 2 1 0 ∆ Phase [m] 0.05 0 –0.05 δ ∆ Phase [m] a. b. FIGURE 13 ∆PR of Code a) and Phase b) of UAVlite CBOC with C/N 0 ~58dB-Hz, recorded by D-FE1 and D-FE2 (same clock; no clock sync.). The top plots show ∆PR(t) and ∆GR)t) (UAVlite movement measured by MS60). The bottom plots show the difference of ∆PR – ∆GR = ε 1 - ε 2 Time [s] 320 360 400 440 Time [s] 320 360 400 440 Time [s] 320 360 400 440 Time [s] 320 360 400 440 3 2 1 0 –1 ∆ Range [m] 1 0 –1 –2 δ ∆ Range [m] 2 1 0 ∆ Phase [m] 0.05 0 –0.05 δ ∆ Phase [m] a. b.

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