Conventional GPS Receiver Limitations
Require minimally obstructed view of sky
- acquisition particularly difficult
Relatively long signal acquisition time
- 30 seconds to 15 minutes to read satellite data message
- Three dimensional search: Satellite PRN Code, time, and frequency
- very long times for high sensitivity
Significant power consumption
- continuous tracking causes substantial power drain
Operation difficult with multipath and interference
- Correlators are sensitive to signal fluctuation
Correlator solution creates large hardware overhead, high cost per unit