Method for measuring distance and position using spread spectrum signal, and an equipment using the method
First Claim
1. A mobile terminal in a terminal positioning system having a mobile terminal and a plurality of base stations, comprising:
- a signal receiver for receiving at least a signal transmitted from one of said plurality of base stations;
a delay profile calculator for calculating a correlation value between the received signal and a predetermined code to generate a delay profile representing a correlation between said received signal and said predetermined code; and
a reference timing detector for determining a reference timing according to a value of said delay profile, wherein a received timing of said received signal is determined based on said reference timing, and a position of said mobile terminal is calculated using said received timing.
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Abstract
By using the delay profile created by delay profile creating section 102 and the first threshold value 330 received from the first threshold value calculation section 105, the first threshold value timing detection section 103 selects only the earliest receive timing exceeding the first threshold value, from all the timing that the correlation value in the delay profile becomes a maximum. By using the receive timing and the second threshold value 331 received from the second threshold value calculation section 107, reference timing calculation section 106 selects the reference timing required for calculating the receive timing for the incoming wave of the minimum propagation delay time. The timing delayed by previously set timing behind said reference timing is sent from receive timing calculation section 108 as the receive timing 113 of the incoming wave of the minimum propagation delay time.
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Citations
17 Claims
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1. A mobile terminal in a terminal positioning system having a mobile terminal and a plurality of base stations, comprising:
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a signal receiver for receiving at least a signal transmitted from one of said plurality of base stations;
a delay profile calculator for calculating a correlation value between the received signal and a predetermined code to generate a delay profile representing a correlation between said received signal and said predetermined code; and
a reference timing detector for determining a reference timing according to a value of said delay profile, wherein a received timing of said received signal is determined based on said reference timing, and a position of said mobile terminal is calculated using said received timing. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A terminal positioning method using received timings of signals transmitted between a plurality of base stations and a terminal, comprising the steps of:
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a first step of calculating a correlation value between a received signal and a predetermined code to generate a delay profile representing a correlation between said received signal and said predetermined code;
a second step of determining a referenced timing according to said generated delay profile;
a third step of determining a received timing based on said reference timing; and
a fourth step of calculating a position of the terminal using said received timing relative to each of the plurality of base stations. - View Dependent Claims (8, 9, 10, 11)
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12. A position measuring apparatus for measuring a position of a mobile terminal using a transmitted signal, comprising:
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a signal receiver for receiving a signal from a transmitting station;
a delay profile generator for generating a delay profile representing a correlation between said received signal and said predetermined code by comparing said received signal with a predetermined code;
a timing detector for detecting, based on said delay profile, a reference timing to be used for calculation of the position of said mobile terminal. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification