Local positioning system for global navigation satellite system denied regions

A navigation system comprising:

• a global positioning satellite system (GNSS) receiver to receive satellite signals from a plurality satellites;
• a local positioning system (LPS) receiver to receive LPS signals from a plurality of fixed location LPS transmitters that are positioned to form a LPS coverage region;
• a memory to store at least operating instructions;
• and
• a controller in communication with the GNSS receiver, the LPS receiver, and the memory, the controller configured to use the LPS signals to determine a location of a vehicle when the vehicle is within the LPS coverage region and within a GNSS denied coverage region;
• wherein the LPS coverage region is a region that provides the LPS signals from at least four fixed location LPS transmitters, each LPS signal from each LPS transmitter includes LPS transmitter location information and clock information used by the controller of the vehicle to determine the location of the vehicle.

A vehicle location determining system that uses a local positioning system (LPS), the vehicle location determining system comprising:

• a display;
• global positioning satellite system (GNSS) receiver to receive satellite signals from a plurality satellites;
• a local positioning system (LPS) receiver to receive LPS signals from a plurality of fixed location LPS transmitters that are positioned to form a LPS coverage region;
• an inertial navigation system (INS) to at least determine relative measurements given an initial reference;
• a memory to store at least operating instructions, the memory including a database that includes at least GNSS coverage regions and LPS coverage regions;
• and
• a controller in communication with the GNSS receiver, the LPS receiver, the INS, the memory, and the display, the controller configured to use the LPS signals to determine a location of the vehicle when the vehicle is within the LPS coverage region and within a GNSS denied coverage region;
• wherein the LPS coverage region is a region that provides the LPS signals from at least four fixed location LPS transmitters, each LPS signal from each LPS transmitter includes LPS transmitter location information and clock information used by the controller of the vehicle to determine the location of the vehicle, the controller further configured to use the location of the vehicle determined with the use of the LPS to calibrate the INS, the controller also configured to use the display to display the GNSS coverage regions and the LPS coverage regions stored in the database.