Abstract: When a GPS terminal (8) is located in a cell (1), positioning is performed by acquiring cell information and position information (ResPos) of the cell (1). Furthermore, since the ResPos acquired by the GPS terminal (8) in the cell (1) includes surrounding cell information about surrounding cells (cell 2 to cell 7), the surrounding cell information is also stored in the GPS terminal (8) in association with the ResPos acquired in the cell (1). When the GPS terminal (8) moves between a plurality of cells, positioning is performed using the ResPos stored in the cell (1) as is if the number of handovers is smaller than a predetermined threshold. On the other hand, if the number of handovers exceeds a predetermined threshold, positioning is performed using the ResPos acquired in the destination cell.

Abstract: A positioning receiver in which the circuit configuration of the receiving system corresponding to a plurality of positioning systems can be simplified and the current consumption and circuit size of which can be reduced. A positioning receiver (100) comprises first low-pass filters (111, 121) which limit outputs of a first signal mixer (103) and a second signal mixer (104) to a first bandwidth, and second low-pass filters (112, 122) which are provided on the output side of the first low-pass filters (111, 121) and limit the outputs of the first low-pass filters (111, 121) to a second bandwidth narrower than the first bandwidth and sets the filter bandwidth of the first low-pass filters (111, 121) greater than that of the second low-pass filters (112, 122).

Abstract: A positioning receiver and a positioning method for user equipment in which errors in the position when the position of the user equipment is calculated can be reduced even in an environment in which the user equipment moves at high speed to improve the accuracy of the position. User equipment (UE) (100) calculates the Doppler shift amount of the pseudo distance data and carrier wave between base stations (BS-1, BS-2, BS-3,& mldr;) on the basis of the communication between the base stations (BS-1, BS-2, BS-3, & mldr;) and calculates a position coordinate from the pseudo distance data between the base stations (BS-1, BS-2, BS-3, & mldr;), provided that the pseudo distance data obtained between the base stations in which the calculated Doppler shift amount is larger than a reference value is not used for the calculation of the position coordinate.

Abstract: A positioning receiver and method in which the time required for signal acquisition can be reduced and positioning time can be reduced by increasing the occasion of the signal acquisition. In an SPS receiver mounted user equipment (100), a Doppler shift amount measuring means (112a) of a frequency search range control unit (112) measures the Doppler shift amount of the signals from a plurality of base stations of a communication network. A search range control means (112b) calculates the difference between the maximum value and minimum value of the measured Doppler shift amount of the base stations and determines the search range at the time of satellite signal search by comparing the difference and a predetermined threshold. The search range control means (112b), if it is judged that the difference between the maximum value and minimum value of the Doppler shift amount is larger than the threshold, sets the search range larger and, if not, sets the search range less.

Abstract: A signal capturing apparatus and a signal capturing method wherein the timing at which to implement the clock frequency correction of a GPS reception part during position determination can be optimized to prevent any search omissions, while shortening the time period required for the position determination. A cellular clock precision estimating function part (120) estimates a reception quality of wireless communication. When an estimated reception quality is equal to or greater than a predetermined threshold value, a corrected timing deciding part (140) implements a GPS clock frequency correction with the cellular clock used as a reference. When the reception quality is less than the predetermined threshold value, the corrected timing deciding part (140) inhibits the GPS clock frequency correction from being implemented with the cellular clock used as a reference.

Abstract: A positioning receiver in which the circuit configuration of the receiving system corresponding to a plurality of positioning systems can be simplified and the current consumption and circuit size of which can be reduced. A positioning receiver (100) comprises first low-pass filters (111, 121) which limit outputs of a first signal mixer (103) and a second signal mixer (104) to a first bandwidth, and second low-pass filters (112, 122) which are provided on the output side of the first low-pass filters (111, 121) and limit the outputs of the first low-pass filters (111, 121) to a second bandwidth narrower than the first bandwidth and sets the filter bandwidth of the first low-pass filters (111, 121) greater than that of the second low-pass filters (112, 122).

Abstract: When a GPS terminal (8) is located in a cell (1) positioning is performed by acquiring cell information and position information (ResPos) of the cell (1). Furthermore, since the ResPos acquired by the GPS terminal (8) in the cell (1) includes surrounding cell information about surrounding cells (cell 2 to cell 7), the surrounding cell information is also stored in the GPS terminal (8) in association with the ResPos acquired in the cell (1). When the GPS terminal (8) moves between a plurality of cells, positioning is performed using the ResPos stored in the cell (1) as is if the number of handovers is smaller than a predetermined threshold. On the other hand, if the number of handovers exceeds a predetermined threshold, positioning is performed using the ResPos acquired in the destination cell.

Abstract: It is an object of the present invention to provide a GPS receiver capable of deciding quickly a GPS satellite as a communication object while suppressing a consumption power. In order to attain the object, when a receiving portion 101 does not receive WNa in the navigation message transmitted from the GPS satellite but receives WN, the GPS receiver of the present invention predicts WNa based on the received WN, and then restores the almanac based on this. Then, the almanac is stored in an almanac storing portion 103, and a satellite position calculating portion 106 reads the almanac as the case may be, and calculates a position of the satellite based on the almanac.

Abstract: A satellite signal receiver includes a satellite signal reception unit, timer, and power-on/off controlling element. The satellite signal reception unit calculates a current position of the satellite signal receiver using an electric wave from a satellite, in response to a positioning request. The timer is used to clock an elapsed time in calculating the current position of this receiver. The power-on/off controlling element controls an on/off state of power supplied to both the satellite signal reception unit and the timer on the basis of information including the positioning request, the elapsed time clocked by the timer, and a reception condition of the satellite signal reception unit. Accordingly, a period of time for supplying the power is automatically turned on/off to be shortened in cases the positioning is impossible, thus the power being saved.

Abstract: A satellite signal receiver includes a satellite signal reception unit, timer, and power-on/off controlling element. The satellite signal reception unit calculates a current position of the satellite signal receiver using an electric wave from a satellite, in response to a positioning request. The timer is used to clock an elapsed time in calculating the current position of this receiver. The power-on/off controlling element controls an on/off state of power supplied to both the satellite signal reception unit and the timer on the basis of information including the positioning request, the elapsed time clocked by the timer, and a reception condition of the satellite signal reception unit. Accordingly, a period of time for supplying the power is automatically turned on/off to be shortened in cases the positioning is impossible, thus the power being saved.

Abstract: A satellite signal receiver includes a satellite signal reception unit, timer, and power-on/off controlling element. The satellite signal reception unit calculates a current position of the satellite signal receiver using an electric wave from a satellite, in response to a positioning request. The timer is used to clock an elapsed time in calculating the current position of this receiver. The power-on/off controlling element controls an on/off state of power supplied to both the satellite signal reception unit and the timer on the basis of information including the positioning request, the elapsed time clocked by the timer, and a reception condition of the satellite signal reception unit. Accordingly, a period of time for supplying the power is automatically turned on/off to be shortened in cases the positioning is impossible, thus the power being saved.

Abstract: In a position informing apparatus using position-measuring means, such as a GPS receiver, and communications means, such as a portable cellular phone, the operating time of the position-measuring means is shortened, thereby diminishing power consumption. Communications means (3), such as a portable cellular phone, of the position informing apparatus is provided with a position-measuring request button (3b) Position-measuring (1), such as a GPS receiver, is usually held in a power-off state, and the communications means (3) remains in a standby state. When the position-measuring request button (3b) is pressed, a control section (2) turns on power to the position-measuring means (1). A signal output from a GPS satellite is received by means of a position-measuring antenna (1a), and the position-measuring means (1) effects position-measuring operation.

Abstract: When a mobile terminal transmits information to an information service centre, the terminal stores positional data of plural points detected by a positional data detector such as a GPS satellite into a memory. The mobile terminal transmits an instant status data, positional data and the terminal ID when an emergency such as an accident, sudden illness occurs. At this time, an appropriate data compression is conducted responsive to a travelling status, such as using relative information, a data-(non-) existing-flag, and a number of points, so that the data volume to be transmitted can be reduced. As a result, the accuracy of positional data is maintained and yet the data transmission time is shortened.

Abstract: A satellite signal receiver includes a satellite signal reception unit, timer, and power-on/off controlling element. The satellite signal reception unit calculates a current position of the satellite signal receiver using an electric wave from a satellite, in response to a positioning request. The timer is used to clock an elapsed time in calculating the current position of this receiver. The power-on/off controlling element controls an on/off state of power supplied to both the satellite signal reception unit and the timer on the basis of information including the positioning request, the elapsed time clocked by the timer, and a reception condition of the satellite signal reception unit. Accordingly, a period of time for supplying the power is automatically turned on/off to be shortened in cases the positioning is impossible, thus the power being saved.