A position detecting system includes receivers and a control unit. The four receivers are attached at positions different from one another in the circumferential direction of a pillar extending in the vertical direction. Each of first areas, which expands in the circumferential direction of the pillar, is an area in which the corresponding three receivers among the receivers receive radio waves from a transmitter directly, and is an area in which the remaining one receiver does not receive radio waves from the transmitter directly. Each of second areas is an area in which the corresponding two receivers among the receivers receive radio waves from the transmitter directly, and is an area in which the remaining two receivers do not receive radio waves from the transmitter directly. The control unit calculates the position of the transmitter by using different position computational algorithms for the first areas and the second areas.

A system and method of locating a key fob with respect to a vehicle includes: communicating between a plurality of directional sensors used by the vehicle and a key fob via a short-range wireless signal; generating signal data at the plurality of directional sensors or the key fob indicative of one or more attributes of the short-range wireless signal; generating location information based on the one or more attributes by processing the signal data generated by the plurality of directional sensors or the key fob; and determining the location of the key fob relative to the vehicle based on the generated location information.

Provided is an apparatus and method associated with a location based service, and an apparatus for integrated positioning that may sense positioning-associated information that is in proximity to a user. The apparatus may hierarchically classify the sensed positioning-associated information into multiple categories of accuracy based on a predetermined criterion, and estimate the location of the user in order of low accuracy information to more precise accuracy information.

In some aspects, a wireless-signal source locator system includes wireless sensor devices distributed at distinct locations over a geographic region. The wireless sensor devices are configured to passively monitor wireless communication network signals in the geographic region. Each wireless sensor device is configured to receive a source signal wirelessly transmitted by a source (e.g., a mobile device, etc.) and a reference signal (e.g., from a synchronization source). The wireless sensor devices can generate arrival-time data based on the source signal and the reference signal. The wireless-signal source locator system further includes a data analysis system configured to receive the arrival-time data from the wireless sensor devices and to identify a location of the source based on analyzing the arrival-time data generated by three or more of the wireless sensor devices.

In some aspects, a wireless-signal source locator system includes wireless sensor devices distributed at distinct locations over a geographic region. The wireless sensor devices are configured to passively monitor wireless communication network signals in the geographic region. Each wireless sensor device is configured to receive a source signal wirelessly transmitted by a source (e.g., a mobile device, etc.) and a reference signal (e.g., from a synchronization source). The wireless sensor devices can generate arrival-time data based on the source signal and the reference signal. The wireless-signal source locator system further includes a data analysis system configured to receive the arrival-time data from the wireless sensor devices and to identify a location of the source based on analyzing the arrival-time data generated by three or more of the wireless sensor devices.

A method to perform localization is disclosed. The method may be performed by a first device of a plurality of devices distributed non-uniformly in a network. Each device, from the plurality of devices, may be configured to detect or obtain signals from an emitter. The method may include obtaining signals from the emitter and converting the signals into a first complex amplitude. The method may further include broadcasting the first complex amplitude to one or more second devices of the plurality of devices. The method may further include obtaining, by the first device, a second complex amplitude from the second devices, and constructing a correlation matrix based on the first complex amplitude and the second complex amplitude. The method may additionally include determining a line of bearing to the emitter based on the correlation matrix, and determining an emitter location based on the line of bearing.

A method to perform localization is disclosed. The method may be performed by a first device of a plurality of devices distributed non-uniformly in a network. Each device, from the plurality of devices, may be configured to detect or obtain signals from an emitter. The method may include obtaining signals from the emitter and converting the signals into a first complex amplitude. The method may further include broadcasting the first complex amplitude to one or more second devices of the plurality of devices. The method may further include obtaining, by the first device, a second complex amplitude from the second devices, and constructing a correlation matrix based on the first complex amplitude and the second complex amplitude. The method may additionally include determining a line of bearing to the emitter based on the correlation matrix, and determining an emitter location based on the line of bearing.

Systems and methods for mapping location and characteristics about wireless emitters are described. The systems and methods advantageously use correlative receivers for observing the emissions from the wireless emitters without decrypting or decoding information included in the emissions from the wireless emitters to allow for tracking location and emitter class and type in real-time. The real-time geolocation and emitter class information for many receivers in a geographic area can be determined and overlaid on a map, for example.

Systems and methods for mapping location and characteristics about wireless emitters are described. The systems and methods advantageously use correlative receivers for observing the emissions from the wireless emitters without decrypting or decoding information included in the emissions from the wireless emitters to allow for tracking location and emitter class and type in real-time. The real-time geolocation and emitter class information for many receivers in a geographic area can be determined and overlaid on a map, for example.

The present invention relates to a driver posture detection apparatus and a driver posture detection method that allow a posture of a driver of a saddle-type vehicle to be detected. A driver posture detection apparatus is provided with: at least two wireless receivers that are attached to a saddle-type vehicle and each include a plurality of antennas; at least one wireless transmitter that is attached to wear of a driver of the saddle-type vehicle; a direction calculation section that calculates, based on phase information on radio waves from the wireless transmitter that are received by the wireless receiver, a direction of the wireless transmitter with respect to the wireless receiver; a position calculation section that calculates, based on direction data calculated by the direction calculation section, a position of the wireless transmitter with respect to the wireless receiver; and a posture calculation section that calculates, based on position data calculated by the position calculation section, a posture of the driver with respect to the saddle-type vehicle.