GPS World, May 2012
DEFENSE Design and Test Sequence Date Stopping Trigger Delay 1PPS ms Acquisition type P Y code State Gram 5 Protected 1 31 03 2011 17 28 23 P Y code State Gram 5 Protected 02 Direct P Y 22 25 68 2 31 03 2011 17 30 39 P Y code State Gram 5 Protected 03 Direct P Y 46 49 97 3 31 03 2011 17 33 23 P Y code State Gram 5 Protected 04 Direct P Y 19 22 68 4 31 03 2011 17 35 38 P Y code State Gram 5 Protected 05 Direct P Y 18 21 67 5 31 03 2011 17 37 50 P Y code State Gram 5 Protected 06 Direct P Y 34 37 68 6 31 03 2011 17 40 05 P Y code State Gram 5 Protected 07 Direct P Y 16 19 38 7 31 03 2011 17 41 50 P Y code State Gram 5 Protected 08 Direct P Y 14 17 38 8 31 03 2011 17 43 33 P Y code State Gram 5 Protected 09 Direct P Y 54 57 98 9 31 03 2011 17 46 18 P Y code State Gram 5 Protected 1 Direct P Y 51 54 98 TABLE 1 Example of Direct P Y acquisitions in accordance with time uncertainty with times to get GRAM state 5 and protected status Monte Carlo Trials FIGURE 12 Real time INS GPS Data Fusion FIGURE 14 Example of an optimal navigation along a specified trajectory in a jamming environment FIGURE 15 Position and velocity errors and navigation corridor GPS World May 2012 www gpsworld com 42
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