A multi-mode position location method detects the location of movable detection devices which are attached to movable carriers in a simulated battlefield. The multi-mode position location method employs three modes of position location of the detection devices. The first mode is a Global Positioning System (GPS) differentially corrected position of the detection device. The second mode is a multilateration determined position of the detection device. The third mode is an autonomously determined GPS position of the detection device. The autonomously determined position is determined without any differential GPS corrections. The most accurately determined position of the detection device may be used for area weapons effects simulation and carrier tracking by transmitting the carrier's position to a master control station.
A navigation system (10) for determining an entry point from an unmatched location to a known route, including a network of navigation route segments (48), an absolute position reverse differential corrector (27) for determining a corrected position of a remote mobile device (12) based on uncorrected absolute position data received from the mobile device (12), and a route entry determiner (32) operably coupled to the network (48) and the reverse differential corrector (27) for determining an accurate entry point of the mobile device (12) onto the network of route segments (48).
A portable data acquisition device, including a position-determining device and data collector, determines and stores positional data associated with objects positioned in a geographical area within sight of the device. Data representative of attributes associated with the objects are also stored in the device. The data stored in the device can be transferred to processing circuitry of a computer and absolute positional coordinates of the objects are determined. The absolute positional coordinates and the data representative of the attributes associated with the objects are placed in files accessible by geographic information system (GIS) software which utilizes the data to form a geographic information system (GIS) database from which GIS maps may be formed.
A server which provides information related to a service instructs positioning accuracy to a mobile terminal in accordance with a content of a requested service. The mobile terminal changes a position detecting method in accordance with the set positioning accuracy.
When position measurement accuracy of the present position which the base station distance and position measurement part measures from radio waves coming from base stations is not good, a GPS distance and position measurement part measures the present position from radio waves coming from GPS satellites. When position measurement accuracy of the present position obtained by the GPS distance and position measurement part is not good, a position measurement accuracy analysis part compounds the present position obtained by the base station distance and position measurement part with the present position obtained by the GPS distance and position measurement part, and calculates a new position within a range of overlap between a position measurement error of the present position obtained by the base station distance and position measurement part and a position measurement error of the present position obtained by the GPS distance and position measurement part.
A global positioning system recorder (GPSR) is disclosed in which operational parameters and recorded positional data are stored on a transferable memory element. Through this transferrable memory element, the user of the GPSR need have no knowledge of GPSR devices other than that the memory element needs to be inserted into the memory element slot and the GPSR must be activated. The use of the data element also allows for minimal downtime of the GPSR and the ability to reprogram the GPSR and download data therefrom, without having to physically attach it to another computer.
