Inside GNSS Media & Research

NOV-DEC 2018

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www.insidegnss.com N O V E M B E R / D E C E M B E R 2 0 1 8 InsideGNSS 55 sis in a real test environment was pre- sented with a detailed discussion of all relevant components needed to set up such a system. e ground system was tested and verified with Galileo OS SIS. It is shown that the WR clock synchro- nization induces a small jitter effect on the phase measurement, which is, how- ever, uncritical in scale for delta pseu- dorange code performance analysis and is also acceptable in most cases for delta pseudorange phase performance anal- ysis. In the subsequent analysis of the UAVlite transmitted E1B CBOC signal good values for code and phase track- ing are reached as well as for the ΔPRC and ΔPRP performance analysis. e values are smaller or in the same range as for the SIS. However it was observed t hat t he tra nsmit ting cha in of PC , USRP, and Tx antenna seems to induce some effects, which are visible in both a small CMC dri and reduced phase tracking performance for higher trans- mitting power. These effects and the underlying processes need to be studied in more detail. e working principle is proven and it is shown that it is a poten- tial technique in the wide field of signal analyzation and optimization, be it in the field of multipath, channel coding, authentication or robustness against FIGURE 10 Tracking results of the UAVlite CBOC pilot signal. Left: D-FE1 and right: D-FE2; from top to bottom: C/N 0 , discriminators, and Code Minus Carrier (CMC) GPS time - t 0 = 386069.001 s[s] GPS time - t 0 = 386069.001 s[s] Signal Power [dB-Hz] 0 100 200 300 400 500 0 100 200 300 400 500 0 100 200 300 400 500 0 100 200 300 400 500 GPS time - t 0 = 386069.001 s[s] 0 100 200 300 400 500 62 60 58 56 54 52 50 Code minus carrier [m] 1.5 1 0.5 0 –0.5 –1 –1.5 –2 e DLL [subchip] 50 100 150 200 250 300 350 0.1 0 –0.1 e PLL [cyc] 0.5 0 –0.5 e FLL [Hz] 50 0 –50 GPS time - t 0 = 386069.001 s[s] GPS time - t 0 = 386069.001 s[s] Signal Power [dB-Hz] 0 100 200 300 400 500 0 100 200 300 400 500 0 100 200 300 400 500 0 100 200 300 400 500 GPS time - t 0 = 386069.001 s[s] 0 100 200 300 400 500 62 60 58 56 54 52 50 Code minus carrier [m] 1.5 1 0.5 0 –0.5 –1 –1.5 –2 e DLL [subchip] 50 100 150 200 250 300 350 0.1 0 –0.1 e PLL [cyc] 0.5 0 –0.5 e FLL [Hz] 50 0 –50 FIGURE 11 Multi correlator plot of UAVlite CBOC signal. Recorded with D-FE2 at 350s (compare to Figure 10). 201 correlator values are used for ±0.51 Chip. Chip offset [m] Multi-correlator value 100 50 0 × 10 9 –50 –100 4 3.5 3 2.5 2 1.5 1 0.5 0

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