GPS World, February 2012
Personal Navigation COVER STORY Ephemeris GPS Step1 Standard Point Posi oning SPP For each epoch Code Measurements Observa on Predic on Visible Invisible 1 0 0 1 Not tracked Tracked Observa on FIGURE 5 Scoring matrix giving the score for each satellite in shadow matching FIGURE 5 FIGURE 6 Experimental Verification Methodology FIGURE 7 3D City Model Step3 Determine Satellite Visibility Predicted Satellite Visibility Predic on GLONASS Step2 Determine n Candidate Posi ons Across Street Candidate Posi ons of P1 P2 Pn Observed Satellite Visibility SPP Solu onP0 For each posi on Evaluate similarity Between Predic on and Observa on Using Evalua on Func on Shadow Matching Step 4 Satellite Visibility Matching Matching Results of Candidate Posi ons P1 P2 Pn Max Output Shadow Matching Results User Posi on Pi FIGURE 6 The shadow matching process Blue denotes input data red denotes main process steps and white denotes intermediate or final results NVS TECHNOLOGIES AG GPS GLONASS GALILEO Compact Robust Professional GNSS Receivers Highly Integrated All Inclusive YƵŝĐŬ dŽ DĂƌŬĞƚ ŶƚĞŐƌĂƟŽŶ SMD 20x26x25mm NV08C Series NAVIGATION TIMING RECEIVERS Dual Independent RF Channels Robust Jamming Immunity 10Hz Update Rate 1PPS 15ns BGA 9122mm RAW Data Carrier Code Phase Doppler TCXO RTC Crystal FLASH Memory WWW NVS GNSS COM www gpsworld com February 2012 GPS World 17
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