# US 11,079,460 B2 · Position determination device for terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,460 B2 - Document ID: US11079460B2 - Status: Granted - Kind: B2 - Application number: 16/253,419 - Filed: 2019-01-22 - Published: 2019-08-29 - Granted: 2021-08-03 - Earliest claimed: 2018-02-28 - Assignees: Doosan Heavy Industries Construction Co., Ltd - Applicants: Doosan Heavy Industries & Construction Co., Ltd. - Inventors: Seong Yeol Yang; Seock Moon Yoon; Young Hoon Seo; Seung Take Oh - Web page: https://patentgrep.com/patent/US11079460B2 ## CPC - G01S 1/042: {Transmitters} - G01S 1/38: using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna - G01S 1/68: Marker, boundary, call-sign, or like beacons transmitting signals not carrying directional information - G01S 5/0009: {Transmission of position information to remote stations (involving assistance data G01S5/0236)} - G01S 5/017: {Detecting state or type of motion} - G01S 5/0226: {Transmitters} - G01S 5/0244: {Accuracy or reliability of position solution or of measurements contributing thereto} - G01S 5/14: Determining absolute distances from a plurality of spaced points of known location - H04W 52/0254: {detecting a user operation or a tactile contact or a motion of the device} - G01S 2201/01: adapted for specific applications or environments - Y02D 30/70: in wireless communication networks - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A position determination device determines the position of a terminal. A signal of a sensor attached to one or both of a beacon and a terminal is sampled, so that a signal of the beacon may be transmitted and received only when the beacon or the terminal has moved. A plurality of beacons sequentially transmit beacon signals to determine the terminal position by determining a distance between the respective beacons and the terminal based on a time to receive the beacons. The device includes a beacon for transmitting a beacon signal; a terminal for receiving the beacon signal; and a first sensor attached to the terminal to sense movement of the terminal and to output a first sensing signal indicative of the sensed movement. The terminal has a reception mode for receiving the beacon signal and turns on/off the reception mode based on the first sensing signal. ## Claims ### Claim 1 A system for determining a position of a terminal, the system comprising: a beacon for transmitting a beacon signal; a terminal for receiving the beacon signal; a first sensor attached to the terminal and configured to sense movement of the terminal and to output a first sensing signal indicative of the sensed movement of the terminal; a second sensor attached to the beacon and configured to sense movement of the beacon and to output a second sensing signal indicative of the sensed movement of the beacon, wherein the terminal has a reception mode for receiving the beacon signal and is configured to turn on/off the reception mode based on the first sensing signal. ### Claim 2 (depends on 1) The system of claim 1, wherein the first sensor comprises one of an acceleration sensor, a gyro sensor, a motion sensor, and a displacement sensor. ### Claim 3 (depends on 1) The system of claim 1, wherein the terminal is configured to turn on the reception mode when the outputted first sensing signal indicates that movement of the terminal is being sensed. ### Claim 4 (depends on 1) The system of claim 1, wherein the terminal is configured to turn off the reception mode when the outputted first sensing signal indicates that no movement of the terminal is being sensed. ### Claim 5 (depends on 1) The system of claim 1, wherein the second sensor comprises one of an acceleration sensor, a gyro sensor, a motion sensor, and a displacement sensor. ### Claim 6 (depends on 1) The system of claim 1, wherein the beacon is configured to transmit the beacon signal when the outputted second sensing signal indicates that movement of the beacon is being sensed. ### Claim 7 (depends on 1) The system of claim 1, further comprising a measurement unit connected to the terminal, wherein the beacon consists of a plurality of beacons for respectively transmitting a plurality of beacon signals, and the measurement unit is configured to determine a current position of the terminal based on the beacon signal received by the terminal from each of the beacons. ### Claim 8 (depends on 1) The system of claim 1, wherein the terminal is configured to receive from the measurement unit information indicative of the current position of the terminal and to transmit the position information to a central control unit. ### Claim 9 A system for determining a position of a terminal, the system comprising: a beacon for transmitting a beacon signal; a terminal for receiving the beacon signal; a first sensor attached to the beacon and configured to sense movement of the beacon and to output a first sensing signal indicative of the sensed movement of the terminal; a second sensor attached to the beacon and configured to sense movement of the beacon and to output a second sensing signal indicative of the sensed movement of the beacon, wherein the beacon is configured to transmit the beacon signal when the outputted sensing signal indicates that movement of the beacon is being sensed. ### Claim 10 (depends on 9) The system of claim 9, further comprising a measurement unit connected to the terminal and configured to determine a current position of the terminal based on the beacon signal received by the terminal from the beacon. ### Claim 11 A system for determining a position of a terminal, the device comprising: a first beacon for transmitting a first beacon signal; a second beacon for receiving the first beacon signal and for transmitting a second beacon signal after a first waiting time from the reception of the first beacon signal by the second beacon; and a terminal for receiving the first beacon signal and the second beacon signal, the first beacon signal being received by the terminal at a first reception time from the transmission of the first beacon signal and the second beacon signal being received by the terminal at a second reception time from the transmission of the second beacon signal, wherein the first beacon signal is transmitted from the first beacon to the second beacon during a first propagation time, and wherein the terminal is configured to determine a distance between the first beacon and the terminal based on the first reception time, and determine a distance between the second beacon and the terminal by reflecting the first propagation time and the first waiting time to the second reception time. ### Claim 12 (depends on 11) The system of claim 11, wherein the second reception time comprises the first propagation time, the first waiting time, and a first arrival time of the second beacon being transmitted from the second beacon to the terminal. ### Claim 13 (depends on 11) The system of claim 11, wherein the first waiting time includes a time required for the second beacon to wait before transmitting the second beacon signal after receiving the first beacon signal. ### Claim 14 (depends on 11) The system of claim 11, wherein the first propagation time and the first waiting time are predetermined values, and wherein the terminal is configured to determine the first arrival time by reflecting the first propagation time and the first waiting time to the second reception time, and determine the distance between the second beacon and the terminal based on the first arrival time. ### Claim 15 (depends on 11) The system of claim 11, further comprising a third beacon for receiving the second beacon signal and for transmitting a third beacon signal after a second waiting time from the reception of the second beacon signal by the third beacon, wherein the second waiting time includes a time required for the third beacon to wait before transmitting the third beacon signal after receiving the second beacon signal. ### Claim 16 (depends on 15) The system of claim 15, wherein the second beacon signal is transmitted from the second beacon to the third beacon during a second propagation time, wherein the third beacon signal is received by the terminal at a third reception time from the transmission of the third beacon signal, and wherein the terminal is configured to determine a distance between the third beacon and the terminal by reflecting the first propagation time, the first waiting time, the second propagation time, and the second waiting time to the third reception time. ### Claim 17 (depends on 16) The system of claim 16, wherein the terminal further comprises a storage unit for storing values of the first propagation time, the first waiting time, the second propagation time, and the second waiting time. ### Claim 18 (depends on 16) The system of claim 16, wherein the third reception time comprises the first propagation time, the first waiting time, the second propagation time, the second waiting time, and a second arrival time of the third beacon being transmitted from the third beacon to the terminal. ### Claim 19 (depends on 17) The system of claim 17, wherein the first propagation time, the second propagation time, the first waiting time, and the second waiting time are predetermined values, and wherein the terminal is configured to determine a third arrival time by reflecting the first propagation time, the first waiting time, the second propagation time, and the second waiting time to the third reception time, and determine the distance between the third beacon and the terminal based on the second arrival time.