Portable telephone terminal with position-determining function
First Claim
1. A portable telephone terminal with a position-determining function, comprising:
- a first radio section for transmitting and receiving a telephone signal;
a second radio section for receiving a position determination signal from a satellite; and
a clock synchronizer for synchronizing a clock signal for the second radio section with a clock signal for the first radio section based on a frequency obtained from the first radio section prior to start of a position determination operation.
1 Assignment
0 Petitions
Accused Products
Abstract
A portable telephone terminal supplies a high-accuracy clock signal during the position determination operation and makes it possible to conduct synchronized introduction of a clock signal into the terminal at an appropriate time. A first radio section transmits and receives a telephone signal. A second radio section receives a position determination signal from a satellite. A clock synchronizer synchronizes a clock signal for the second radio section with a clock signal for the first radio section based on a frequency obtained from the first radio section prior to start of a position determination operation. A controller may be additionally provided for controlling the operations of the first and second radio sections. The controller conducts its operation in such a way as to connect the terminal to a radio line prior to a position determination operation. The clock synchronizer conducts its synchronization operation after the terminal is connected to the radio line.
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Citations
19 Claims
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1. A portable telephone terminal with a position-determining function, comprising:
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a first radio section for transmitting and receiving a telephone signal;
a second radio section for receiving a position determination signal from a satellite; and
a clock synchronizer for synchronizing a clock signal for the second radio section with a clock signal for the first radio section based on a frequency obtained from the first radio section prior to start of a position determination operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A portable telephone terminal with a position-determining function, comprising:
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a first radio section for transmitting and receiving a telephone signal;
a second radio section for receiving a position determination signal from a satellite; and
a controller for controlling operations of the first and second radio sections;
wherein the controller conducts its control operation in such a way as to acquire cell information identifying or specifying a cell to which the portable telephone terminal belongs from outside by way of a portable telephone network;
and wherein if a desired position determination operation can be conducted based on the cell information acquired, the controller conducts its control operation in such a way as to conduct the desired position determination operation using the cell information without using the position determination signal from the satellite. - View Dependent Claims (10, 11)
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12. A portable telephone terminal with a position-determining function, comprising:
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a first radio section for transmitting and receiving a telephone signal;
a second radio section for receiving a position determination signal from a satellite;
an analyzer for analyzing times of arrival of telephone signals obtained from the first radio section; and
a controller for controlling operations of the first and second radio sections;
wherein the analyzer analyzes times of arrival of the telephone signals obtained from the first radio section, thereby calculating their time differences of arrival;
and wherein the controller conducts its control operation in such a way as to conduct a position determination operation based on the time differences of arrival calculated. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification