Abstract: A method of detecting errors in road characteristics in a transportation network database includes collecting sequential location measurements from probes traversing between two end points, fitting trace segments having a curved or linear shape between the sequential location measurements collected from the probes to form a probe trace, comparing a position of the probe traces with a position of a calculated path between the two end points, where the calculated path is formed from linked transportation network segments each of the linked transportation segments having a curved or linear shape, where the calculated path follows the road characteristics defined by the attributes associated with the linked transportation segments, and identifying a potential error in the attributes if a probe trace deviating in position from the calculated path is greater than a deviation threshold.

Abstract: Communications are established and conducted between a communication and jamming detection at a vehicle and a base station. At the communication and jamming detection device, a determination is made as to when jamming of the communications between the communication and jamming detection device and the base station is occurring. When jamming is determined to be occurring, at least one location determination signal is transmitted from the communication and jamming detection device to at least one external tracking device. At the at least one external location determination device, the at least one location determination signal is received from the communication and jamming detection device. The location of the communication and jamming detection device at the vehicle is determined from the at least one location determination signal.

Abstract: An enhanced control system for an unmanned aerial vehicle adds constraints to the process of choosing a flight path in the event of an in-flight contingency, such as engine out or an encounter with jamming, which forces a diversion or unplanned landing. The constraints are: (1) ensure communications are available when needed during contingency operations; and (2) ensure signals from a global positioning system (or other navigation system) are available when needed during contingency operations.

Abstract: According to one embodiment, a method for providing location information to a mobile receiver from a plurality of aerial vehicles is provided. The method includes receiving a source location from at least three location sources at each aerial vehicle of the plurality of aerial vehicles. The at least three location sources includes a remote aerial vehicle. A predicted location of the aerial vehicle at a future time is calculated at each aerial vehicle based at least in part on a current time at the aerial vehicle, the received source locations, and ephemeris data that represents motion of each remote aerial vehicle. The predicted location is transmitted at the future time at each aerial vehicle. The transmitted locations from the aerial vehicles are used by a mobile receiver to determine a current location of the mobile receiver.

Abstract: An auxiliary satellite positioning system is applied to a first satellite positioning apparatus. The auxiliary positioning system includes a detection module, a transmission interface and a positioning module. A second satellite positioning module having a satellite data can be detected by the detection module via a wireless transmission protocol. The satellite data can be transmitted by the transmission interface to the first satellite positioning module from the second satellite positioning module. The satellite data can be used by the positioning module to implement a satellite positioning action.