Method, and apparatus for measuring distance using radio frequency signal
First Claim
1. A method for measuring a distance using a radio frequency (RF) signal, the method comprising:
- setting a transmitter power of an RF signal of a signal generating module to a minimum so as to measure the longest distance within a region when no obstacle exists between the signal generating module and a fixed module;
measuring a distance between the signal generating module and the fixed module using the RF signal whose transmitter power is set to the minimum;
if the measured distance between the signal generating module and the fixed module is available, determining that no obstacle exists therebetween, and if the measured distance is not available, determining that an obstacle exists therebetween; and
determining the distance according to the result of the determination of existence of an obstacle.
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Accused Products
Abstract
Provided are a method, apparatus, and medium for measuring a distance using a radio frequency (RF) signal. The method of measuring a distance includes setting the transmitter power of an RF signal of a signal generating module to a minimum so as to measure the longest distance when no obstacle exists, measuring a distance between the signal generating module and a fixed module using the RF signal whose transmitter power is set to the minimum, if the measured distance between the signal generating module and the fixed module is available, determining that no obstacle exists therebetween, and if the measured distance is not available, determining that an obstacle exists therebetween, and determining the distance according to the result of the determination of existence of an obstacle.
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Citations
25 Claims
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1. A method for measuring a distance using a radio frequency (RF) signal, the method comprising:
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setting a transmitter power of an RF signal of a signal generating module to a minimum so as to measure the longest distance within a region when no obstacle exists between the signal generating module and a fixed module; measuring a distance between the signal generating module and the fixed module using the RF signal whose transmitter power is set to the minimum; if the measured distance between the signal generating module and the fixed module is available, determining that no obstacle exists therebetween, and if the measured distance is not available, determining that an obstacle exists therebetween; and determining the distance according to the result of the determination of existence of an obstacle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of measuring a distance using an RF signal, the method comprising:
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setting the transmitter power of an RF signal of a signal generating module to a minimum so that when no obstacle exists in a region between the signal generating module and a fixed module, a longest distance within the region can be measured; generating the signal by increasing the transmitter power set to the minimum, of the signal, by a preset interval until the transmitter becomes a maximum, and storing the distance values measured between the signal generating module and the fixed module, and the transmitter powers; using the stored distance values with respect to transmitter powers, if the measured distance is available using the signal at the transmitter power set to the minimum, determining that no obstacle exists between the signal generating module and the fixed module, and if the distance cannot be measured, determining that an obstacle exists; and determining the distance according to whether or not an obstacle exists. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus for measuring a distance using an RF signal, the apparatus comprising:
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a signal generating module to generate an RF signal and to receive back the transmitted signal; a fixed module at a fixed position to receive the transmitted signal and then, to transmit the received signal; a distance measuring module to measure the distance between the signal generating module and the fixed module, using the generated signal; an obstacle determining module to determine whether or not an obstacle exists between the signal generating module and the fixed module; and a distance determining module to determine the distance using the measured distance value and distance data that is pre-measured with respect to the transmitter power and the distance, wherein the signal generating module generates an RF signal, by setting the transmitter power of the RF signal to a minimum so that when no obstacle exists between the signal generating module and the fixed module in the region, a longest distance within the region can be measured, and the distance measuring module measures the distance using the generated signal, and if the measured distance is available, the obstacle determining module determines that no obstacle exists between the signal generating module and the fixed module, and if the distance cannot be measured, the obstacle determining module determines that the obstacle exists. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for measuring a distance using an RF signal, the apparatus comprising:
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a signal generating module to generate an RF signal and receiving back the transmitted signal; a fixed module at a fixed position to receive the transmitted signal and then, to transmit the received signal; a distance measuring module to measure the distance between the signal generating module and the fixed module, using the generated signal; a storage module to store the measured distance and the transmitter power; an obstacle determining module to determine whether or not an obstacle exists between the signal generating module and the fixed module; and a distance determining module to determine the distance using the measured distance value and distance data that is pre-measured with respect to the transmitter power and the distance, wherein the signal generating module sets the transmitter power of an RF signal to a minimum so that when no obstacle exists between the signal generating module and a fixed module in a region, a longest distance within the region measured can be measured, and the distance measuring module measures the distance by increasing the transmitter power of the signal by a preset interval until the transmitter power becomes a maximum, and the storage module stores the measured distance values and the corresponding transmitter powers, and if the measured distance is available using the signal generated at the transmitter power set to the minimum, the obstacle determining module determines that no obstacle exists between the signal generating module and the fixed module, and if the distance cannot be measured, the obstacle determining module determines that the obstacle exists. - View Dependent Claims (22, 23, 24, 25)
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Specification