摘要:
The present invention describes a method to calibrate an angular measurement device using acceleration measurement device. The angular rate measurement device includes at least one angular measurement sensor, wherein the acceleration measurement device is able to distinguish the direction and strength of gravity. By performing the calibration method the scale factor(s) of the angular measurement device and the strength and direction of gravity can be obtained and/or corrected. An embodiment according to the method of the present invention describes optional use of a communication network to perform necessary evaluation and calculation steps at a remote device.
摘要:
Equipment and a method by which power consumed by a ranging receiver (12) is reduced without appreciably impairing performance of the GPS receiver (12), the method including: a step (21) in which a controller (15) reads sensor signals provided by a motion sensor (14) mechanically coupled to the ranging receiver (12); and a step (22) in which the controller (15) powers down selected components of the ranging receiver (12) based on whether the sensor signals indicate only at most insubstantial motion of the ranging receiver (12). The motion sensor is advantageously a motion sensor constructed using MEMS technology, but at any rate is of a type using so little power as to provide a power savings when used according to the invention, i.e. when it is always on and at least partially based on its sensor signals, the ranging receiver (12) is sometimes at least partially turned off.
摘要:
The invention relates to a time and location dependent atmosphere model and especially determining the altitude of a mobile terminal based on this model and the measured barometric pressure at the location of the terminal. The atmosphere model provides a long term, wide area barometric pressure model estimate.
摘要:
Equipment and a method by which power consumed by a ranging receiver (12) is reduced without appreciably impairing performance of the GPS receiver (12), the method including: a step (21) in which a controller (15) reads sensor signals provided by a motion sensor (14) mechanically coupled to the ranging receiver (12); and a step (22) in which the controller (15) powers down selected components of the ranging receiver (12) based on whether the sensor signals indicate only at most insubstantial motion of the ranging receiver (12). The motion sensor is advantageously a motion sensor constructed using MEMS technology, but at any rate is of a type using so little power as to provide a power savings when used according to the invention, i.e. when it is always on and at least partially based on its sensor signals, the ranging receiver (12) is sometimes at least partially turned off.
摘要:
A system and method for changing the weighting accelerometer filtering based upon motion sensor measurements. Using measurements from motion sensors, one or more features can be extracted. This information is used by an algorithm to assign a most appropriate test feature class to be the class of the state of motion at a particular moment in time. This information is used to provide more accurate positioning information, and can also be used to power down the motion sensor at various times, providing an improvement in battery efficiency.
摘要:
At least one set of values of parameters is determined, each set of values defining a respective troposphere model. The at least one determined set of parameter values is then assembled for transmission via a wireless communication network to a wireless terminal as assistance data for an assisted satellite based positioning of the wireless terminal.
摘要:
A system and method for changing the weighting accelerometer filtering based upon motion sensor measurements. Using measurements from motion sensors, one or more features can be extracted. This information is used by an algorithm to assign a most appropriate test feature class to be the class of the state of motion at a particular moment in time. This information is used to provide more accurate positioning information, and can also be used to power down the motion sensor at various times, providing an improvement in battery efficiency.
摘要:
A method for updating a data base which includes positioning data and identity information of a cell, the method comprising receiving a position of a device and receiving identity information of a cell. The data base is examined to find parameter information relating to the received identity information. The parameter information is retrieved from the data base. It is determined whether the data base is to be updated with the position data of the device, wherein if it is determined that the data base is to be updated, the updating of the data base is performed by using the position data of the device and the value of an updating parameter is updated.