Distance measurement device and distance measurement method
First Claim
1. A distance measurement device, comprising:
- a transceiver that, in a distance measurement process between the distance measurement device and a communication device,transmits a command to the communication device of a network system configured to include the distance measurement device and the communication device, andreceives a response from the communication device as a response to the command; and
a distance measurement controller thatinstructs the transceiver to transmit the command when starting the distance measurement process,measures a period of time until the response is received after the command is transmitted, andcalculates a distance between the distance measurement device and the communication device on the basis of the measured period of time,wherein, before repeatedly executing the distance measurement process, the distance measurement controller determines, on the basis of a comparison result of the calculated distance and a specified amount, the number of times the distance measurement process, which is until the distance is calculated after the command is transmitted, is repeated,wherein a communication cycle of the communication device is adjusted based on the calculated number of times the distance measurement process is repeated.
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Abstract
A distance measurement device includes a transceiving unit that, in a distance measurement process between the distance measurement device and nodes, transmits a command to the nodes, and receives a response as a response to the command; and a distance measurement control unit that instructs the transceiving unit to transmit the command when the distance measurement process starts, measures a period of time until the response is received after the command is transmitted, and calculates a distances between the distance measurement device and the nodes on the basis of the measured period of time. The distance measurement control unit determines the number of repetitions for the distance measurement process until the distance is calculated after the command is transmitted on the basis of the calculated distance.
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Citations
8 Claims
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1. A distance measurement device, comprising:
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a transceiver that, in a distance measurement process between the distance measurement device and a communication device, transmits a command to the communication device of a network system configured to include the distance measurement device and the communication device, and receives a response from the communication device as a response to the command; and a distance measurement controller that instructs the transceiver to transmit the command when starting the distance measurement process, measures a period of time until the response is received after the command is transmitted, and calculates a distance between the distance measurement device and the communication device on the basis of the measured period of time, wherein, before repeatedly executing the distance measurement process, the distance measurement controller determines, on the basis of a comparison result of the calculated distance and a specified amount, the number of times the distance measurement process, which is until the distance is calculated after the command is transmitted, is repeated, wherein a communication cycle of the communication device is adjusted based on the calculated number of times the distance measurement process is repeated. - View Dependent Claims (2, 3, 4)
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5. A distance measurement method in a distance measurement device that constitutes a network system with a communication device, comprising:
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transmitting a command to the communication device when a distance measurement process starts, wherein the communication device is connected to the distance measurement device via a communication network; receiving a response from the communication device as a response to the command; measuring, by the distance measurement device, a period of time until the response is received after the command is transmitted; calculating a distance between the distance measurement device and the communication device based on the measured period of time; and before the distance measurement process is repeatedly executed, determining, based on a comparison result of the calculated distance and a specified amount, number of times the distance measurement process is repeated, wherein the distance measurement process comprises the transmitting, the receiving, the measuring, and the calculating, wherein a communication cycle of the communication device is adjusted based on the calculated number of times the distance measurement process is repeated. - View Dependent Claims (6, 7, 8)
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Specification