Method for measuring distance and position using spread spectrum signal, and an equipment using the method
First Claim
1. A method for measuring distance comprising:
- a first step to create a delay profile from the signal wave received from a signal transmitting station;
a second step to detect the startup timing of the delay profile as reference timing; and
a third step to detect the timing delayed by a predetermined value behind the reference timing as the receive timing for the signal wave;
wherein the distance between the signal transmitting station and signal receiving station is measured from the difference between the transmitting timing of said signal transmitting station and the receive timing.
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Abstract
Under a multi-path environment, receive timing for the incoming wave of the minimum propagation delay time cannot be accurately measured using the prior art.
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
21 Claims
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1. A method for measuring distance comprising:
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a first step to create a delay profile from the signal wave received from a signal transmitting station;
a second step to detect the startup timing of the delay profile as reference timing; and
a third step to detect the timing delayed by a predetermined value behind the reference timing as the receive timing for the signal wave;
wherein the distance between the signal transmitting station and signal receiving station is measured from the difference between the transmitting timing of said signal transmitting station and the receive timing. - View Dependent Claims (2)
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3. A position measuring method comprising:
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a first step for creating independent delay profiles from the signal waves received from at least three signal transmitting stations; and
a second step for detecting the startup timing of each said delay profile as reference timing;
wherein the time difference between the reference timing of each delay profile and receive timing of signal transmitting stations corresponding to said delay profile are calculated, and the positions of said signal receiving station are measured from the relative differential timing thereof. - View Dependent Claims (4)
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5. An equipment for measuring distance using the wave signal received from a signal transmitting station comprising:
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a means for creating a delay profile from the signal wave received from said signal transmitting station;
a means for calculating the startup timing of said delay profile as reference timing;
a means for calculating the timing delayed by a predetermined value behind the reference timing as the receive timing for the signal wave; and
a means for measuring distance from the difference between the transmitting timing of said signal transmitting station and the eceive timing - View Dependent Claims (6)
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7. An equipment for measuring positions using the wave signals received from signal transmitting stations comprising:
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a means for creating independent delay profiles from the signal waves received from at least three signal transmitting stations;
a means for calculating the startup timing of each delay profile as reference timing; and
a means for calculating the time difference between the reference timing of each delay profile and receive timing of signal transmitting stations corresponding to said delay profile, and measuring the positions of said signal receiving station from the relative differential timing thereof. - View Dependent Claims (8)
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9. Terminal equipment for receiving spread spectrum signals and measuring distances using these signals comprising:
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a means for receiving the spread spectrum signal required for distance measurement, and creating a signal from the received signal;
a means for generating the same spread spectrum signal as that transmitted from the spread spectrum signal transmitting station, and creating a delay profile for calculating the correlation value between the spread spectrum signal and the received signal mentioned above;
a means for holding the output of the delay profile creating means;
a means for calculating the first threshold value;
a means for detecting the earliest receive timing in which the correlation value becomes equal to the first threshold value;
a means for calculating the second threshold value;
a means for detecting the second reference receive timing from the second threshold value, delay profile, and first reference receive timing; and
a means for calculating the receive timing of the signal from the second reference receive timing.
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10. A terminal equipment for receiving spread spectrum signals and measuring positions using these signals comprising:
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a means for receiving the spread spectrum signal required for position measurement, and creating a signal from the received signal;
a means for generating the same spread spectrum signal as that transmitted from the spread spectrum signal transmitting station, and creating a delay profile for calculating the correlation value between said spread spectrum signal and the received signal;
a means for holding the output of said delay profile creating means;
a means for calculating the first threshold value;
a means for detecting the earliest receive timing in which the correlation value becomes equal to the first threshold value;
a means for calculating the second threshold value; and
a means for calculating the second reference receive timing from said second threshold value, delay profile, and first reference receive timing. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification