Method for measuring distance and position using spread spectrum signal, and an equipment using the method
First Claim
1. A terminal positioning method using received timings of received signals as to particular incoming waves transmitted between a plurality of base stations and a terminal, the method comprising the steps of:
- a first step of calculating a correlation value between each of said received signals and a predetermined code to create a delay profile representing a correlation between each of said received signals and the predetermined code;
a second step of determining said received timings of each of said incoming waves with reference to a rise timing when each of said delay profiles rises from a noise level; and
a third step of calculating a position of said terminal by using said received timings relative to the plurality of the base stations,wherein a first threshold value for determining said rise timing is set and a second threshold value, which is larger than said first threshold value and used to determine each of incoming waves, is set on the basis of a maximum correlation value measured, and a received timing of said each incoming wave is determined at that point in time when a value of said delay profile becomes equal to said second threshold value, and said rise timing is set when the value of said delay profile is equal to said first threshold value before the received timing of said incoming wave.
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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 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.
32 Citations
11 Claims
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1. A terminal positioning method using received timings of received signals as to particular incoming waves transmitted between a plurality of base stations and a terminal, the method comprising the steps of:
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a first step of calculating a correlation value between each of said received signals and a predetermined code to create a delay profile representing a correlation between each of said received signals and the predetermined code; a second step of determining said received timings of each of said incoming waves with reference to a rise timing when each of said delay profiles rises from a noise level; and a third step of calculating a position of said terminal by using said received timings relative to the plurality of the base stations, wherein a first threshold value for determining said rise timing is set and a second threshold value, which is larger than said first threshold value and used to determine each of incoming waves, is set on the basis of a maximum correlation value measured, and a received timing of said each incoming wave is determined at that point in time when a value of said delay profile becomes equal to said second threshold value, and said rise timing is set when the value of said delay profile is equal to said first threshold value before the received timing of said incoming wave. - View Dependent Claims (2, 3)
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4. Terminal equipment in a terminal positioning system for positioning the terminal equipment using received timings of received signals as to particular incoming waves transmitted from a plurality of base stations to the terminal equipment comprising:
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a signal receiving part for receiving said signals from said base stations; a delay profile calculating part for creating a delay profile representing a correlation between each of said received signals and a predetermined code by calculating a correlation value between each of said received signals and the predetermined code; and a received timing calculating part for determining each of said received timings relative to the plurality of the base stations by using said delay profile, wherein said received timing calculation part determines each of said received timings with reference to a rise timing when said delay profile rises from a noise level, and wherein said rise timing is a point in time when a value of said delay profile is equal to a first threshold value, before an incoming wave determination timing which is used to determine a reception of each of said incoming waves and that is a timing when the value of said delay profile becomes equal to a second threshold value which is set on the basis of a maximum correlation value measured so as to be larger than said first threshold value. - View Dependent Claims (5, 6, 7)
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8. A terminal positioning apparatus which measures a position of terminal equipment by using received timings of received radio signals as to particular incoming waves transmitted between a plurality of base stations and said terminal equipment comprising:
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a delay profile calculating part for creating a delay profile representing a correlation between each of said received signals and a predetermined code by calculating a correlation value between each of said received signals and the predetermined code; and a received timing calculating part for determining each of said received timings relative to the plurality of the base stations by using said delay profile, wherein said received timing calculation part determines each of said received timings with reference to a rise timing when said delay profile rises from a noise level, and wherein said rise timing is a point in time when a value of said delay profile is equal to a first threshold value, before an incoming wave determination timing which is used to determine a reception of each of said incoming waves and that is a timing when the value of said delay profile becomes equal to a second threshold which is set on the basis of a maximum correlation value measured so as to be larger than said first threshold value. - View Dependent Claims (9, 10, 11)
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Specification