摘要:
Systems and methods are disclosed for reducing power consumption of a mobile device in determining locations by determining if the mobile device is stationary; and if the mobile device is stationary, determining if the mobile device is in a zone with a known location and assign the known location as the location of the mobile device without involving a position determination system in the mobile device to reduce power consumption arising therefrom.
摘要:
Systems and methods are disclosed for reducing power consumption of a mobile device in determining locations by determining if the mobile device is stationary; and if the mobile device is stationary, determining if the mobile device is in a zone with a known location and assign the known location as the location of the mobile device without involving a position determination system in the mobile device to reduce power consumption arising therefrom.
摘要:
A system, method and apparatus are provided which relate to calibrating a wireless access point so as to allow proper synchronization of mobile wireless devices connecting to the wireless access point. A closed-loop filter is used to more accurately synchronize times and to more accurately determine the location of the access point for purposes of determining the position of a mobile station.
摘要:
Described herein are methods and systems for configuring a motion sensor assembly to compensate for a temperature gradient. First and second sensors of the same type are arranged as opposing pairs with respect to a first axis that may be defined by a temperature gradient caused by at least one thermal element. Combining the output measurements of the first sensor and the second sensor allows effects of the temperature gradient on sensor measurements of the first sensor and the second sensor to be compensated.
摘要:
A method and apparatus for using a predetermined portion of terrain elevation maps in a database for aiding in computing a three-dimensional position of a wireless station. Instead of using the entire terrain model of the earth or an entire country, the database consists of an incomplete model, which includes only the most populous areas or specific regions. This reduces the size of the information in the database, which in turn reduces the amount of time to compute the positions of the wireless device.
摘要:
Location profile is used as a way of optimizing power consumption of communication devices such as mobile handsets and smart phones which tend to have facilities for multiple wireless methods for communication. This is done by correlating the availability of the wireless signals to the specific zones in the user location profile. The method learns the wireless environment of each zone and subsequently while the device is detected to be in the same zone, intelligently prioritizes use of different communication methods for that zone, and turns off all unnecessary communication options, thereby reducing power consumption.
摘要:
An apparatus and method are disclosed for achieving receiver diversity. A wireless unit includes a plurality of antennas, an antenna selector to select one or more antennas from the plurality of antennas, a processor with input data from an inertial sensor for monitoring the orientation of the wireless unit. Based on the input data, the processor commands the antenna selector to select one or more antennas. In some embodiments, the processor is a diversity processor. Based on the input data from the inertial sensor, the diversity processor computes the combination of the received signals. In another aspect, the wireless unit further includes a baseband processor to process the output of the diversity processor for a particular unit application.
摘要:
The subject matter disclosed herein relates to a system and method for acquiring signal received from satellite vehicles (SVs) in a satellite navigation system. In one example, although claimed subject matter is not so limited, information processed in acquiring a signal from a first SV may be used in acquiring a signal from a second SV.
摘要:
An embodiment of the present invention is a combined GPS and dead-reckoning (DR) navigation sensor for a vehicle in which a pair of modifications are made to an otherwise conventional Kalman filter. Process noise is adapted to cope with scale factor errors associated with odometer and turning rate sensors, and correlated measurement error processing is added. When only two Doppler measurements (PRRs), or three with an awkward three-satellite geometry, are available, DR error growth can nevertheless be controlled. The measurement error correlations in the conventional Kalman filter covariance propagation and update equations are explicitly accounted for. Errors induced by selective availability periods are minimized by these two modifications.