GPS and Navigation Products
CRS pioneered the pseudolite technology and demonstrated pseudolite based navigation both during total GPS denied and partial GPS-obscured situations. The pseudolites were originally developed for the U.S. Army and later user by Boeing Corpn. for helicopter guidance and precision landing. Some relevant documents:
- Brekke, D., D. Wilson, A. Brown. “Pseudolite Navigation for Rotorcraft and Ground-Based Vehicles.” ION GNSS 2008, Savannah, GA 2008.
- Noronha, J., A. Jovancevic, N. Bhatia, B. Sirpatil, M. Kirchner, and D. Saxena. "Field Test Results of a Flexible Pseudolite Based Navigation System." ION GNSS 2006, Fort Worth, TX. 2006.
The pseudolites are available as COTS products and consist of 1) Transmitter Units or 2) Receivers. The user can select either GPS frequency or alternate 915 MHz. The transmitter units (minimum 4 required for stand-alone operation) can be synchronized with GPS clock. Other synchronization schemes are also available.