Integration of GPS with a WiFi high accuracy ranging functionality

Figures & data

Figure 1 Performance of IFATE against SPM and cross-correlation in terms of: (a) absolute range error in meters and (b) processing time in seconds (33).

Figure 2 Structure of the implemented WiFi-enabled reference node (33).

Figure 3 Wireless TDOA indoor test configurations (33).

Figure 4 Distribution of the synchronization error of the digital storage oscilloscope.

Figure 5 The selected test area to demonstrate the integrated GPS/WiFi performance.

Table 1. Coordinates of the WiFi reference nodes used in the test scenarios.

Reference node ID	Latitude (°)	Longitude (°)	Height (m)
RN1	51.51436	−0.076811	73.77
RN2	51.51479	−0.07804	71.77
RN3	51.514941	−0.077484	79.77
RN4	51.515056	−0.077771	71.77

Figure 6 Standalone GPS performance in the open area (1st test scenario).

Figure 7 Standalone GPS performance in the built-up area (2nd test scenario).

Figure 8 GPS/WiFi integrated solution with 3 WiFi reference nodes (3rd test scenario).

Figure 9 GPS/WiFi integrated solution with 4 WiFi reference nodes (4th test scenario).

Figure 10 CDF of the position error for the built-up area test scenarios.

Nur, K.; Feng, S.; Ling, C., Ochieng, W. Application of the Improved FOCUSS for Arrival Time Estimation (IFATE) Algorithm to WLAN High Accuracy Positioning Services. In Proceedings of Ubiquitous Positioning, Indoor Navigation, Location Based Service (UPINLBS), 2012, 1–8.

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