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GPS/INS integrated navigation systems have been used for guided munitions. By adding the navigation system into unguided munitions, accuracy can be highly improved. In these applications, GPS receivers have to meet certain requirements such as gun-hardening, fast signal acquisition and jammer tolerance. Especially, the signal should be acquired as fast as possible since mission time is very short. Several methods have been proposed for fast acquisition. These methods make it possible to reduce acquisition time by searching code phases in parallel. However, in military applications, the Doppler frequency range to be searched should be reduced since the Doppler frequency range is wider than conventional vehicle. This paper proposes a fast acquisition method using INS velocity and multiple correlators for high speed vehicles. In order to reduce acquisition time, range of the Doppler frequency is reduced using INS velocity and number of code phase to be searched is reduced using multiple correlators. Monte-Carlo simulation was carried out to show performance of the proposed method.

A Fast GPS Signal Acquisition Method for High Speed Vehicles Using INS Velocity and Multiple Correlators