[특허]Systems and methods of wireless position tracking

Systems and methods of wireless position tracking 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01S-003/02 G01S-005/04 G01S-011/10 H04W-064/00 G01S-005/08
출원번호	US-0354833 (2012-11-13)
등록번호	US-9945940 (2018-04-17)
국제출원번호	PCT/US2012/064860 (2012-11-13)
국제공개번호	WO2013/071302 (2013-05-16)
발명자 / 주소	Min, Guohua Schneider, Mark
출원인 / 주소	POSITION IMAGING, INC.
대리인 / 주소	Lando & Anastasi, LLP
인용정보	피인용 횟수 : 0 인용 특허 : 50

초록 ▼

Position and orientation tracking systems and methods include a transmitting antenna transmitting a radio frequency (RF) signal. At least one receiving antenna acquires the RF signal. One of the at least one receiving antenna and the transmitting antenna is designated a reference antenna. A processing unit determines a phase difference between the RF signal received by each receiving antenna and the reference antenna. The processing unit computes a position of the transmitting antenna with respect to the at least one receiving antenna in response to the phase difference determined for each receiving antenna.

대표청구항 ▼

1. A position tracking system comprising, a radio frequency (RF) transmitter transmitting a pseudo-noise code modulated RF signal;an RF receiver in communication with the RF transmitter to receive and demodulate the pseudo-noise code modulated RF signal;a controller in communication with the RF receiver to receive the pseudo-noise code modulated RF signal, the controller including a reference generator to provide a code reference signal that is synchronized with the pseudo-noise code modulated RF signal, a code discriminator to perform a time of flight estimation of the RF signal from the transmitter to receiver by comparing the code reference signal with a recovered signal derived from the pseudo-noise code modulated RF signal, and a carrier phase discriminator to measure phase shift for sub-wavelength determination; anda computing system in communication with the controller to receive the time of flight estimation and measured phase shift and to determine a position of the RF transmitter with respect to the RF receiver based on a combination of the time of flight estimation and measured phase shift. 2. The position tracking system of claim 1, wherein a carrier wavelength of the RF transmitter is suitable for sub-wavelength phase measurement. 3. The position tracking system of claim 1, wherein the reference signal generator is in communication with the RF transmitter to receive a reference signal therefrom, the reference signal generator providing the code reference signal based on the reference signal received from the RF transmitter, and wherein in performing the time of flight estimation the code discriminator performs a correlation-type process between the code reference signal and the recovered signal derived from the pseudo-noise code modulated RF signal, the recovered signal being a pseudo-noise code sequence. 4. The position tracking system of claim 1, wherein the carrier phase discriminator determines the phase shift measurement by integrating in-phase and out-of-phase components of the demodulated pseudo-noise code modulated RF signal and determining the phase shift based on a ratio of the demodulated integrated in-phase and out-of-phase components of the pseudo-noise code modulated RF signal. 5. The position tracking system of claim 4, wherein the computing system receives time delay information determined by the time of flight estimation and the measured phase shift and determines a time of flight between the RF transmitter and the RF receiver. 6. The position tracking system of claim 1, further comprising a plurality of receiver antennae for determining multiple location and orientation parameters of the RF transmitter. 7. The position tracking system of claim 6, wherein the plurality of RF receiver antennae includes at least three receiver antennae for determining three location parameters of the RF transmitter. 8. The position tracking system of claim 6, further comprising a plurality of RF transmitters in communication with the plurality of RF receivers to provide orientation information. 9. A method of tracking position comprising, receiving a pseudo-noise code modulated radio frequency (RF) signal, transmitted by a transmitting antenna, by three or more receiving antennae;performing a time of flight estimation of the RF signal from the transmitting antenna to the receiving antennae based on a comparison between a recovered signal derived from the pseudo-noise code modulated RF signal and a reference pseudo-noise code modulated signal that is synchronized with the RF signal;measuring phase shift between the transmitted RF signal and the received RF signal at each receiving antenna; anddetermining a position of the transmitting antenna with respect to the receiving antennae based on a combination of the time of flight estimation and the measured phase shift at each receiving antenna. 10. The method of claim 9, wherein measuring phase shift between the transmitted RF signal and the received RF signal at each receiving antenna includes demodulating in-phase and out-of-phase components of the RF signal using a reference carrier signal. 11. The method of claim 10, wherein measuring the phase shift further includes integrating the demodulated in-phase and out-of-phase components of the received RF signal at each receiving antenna and determining a ratio of the demodulated integrated in-phase and out-of-phase components of the RF signal. 12. The method of claim 9, further comprising determining multiple location and orientation parameters of the transmitting antenna. 13. The method of claim 9, further comprising determining three location parameters of the transmitting antenna. 14. The position tracking system of claim 6, wherein the RF transmitter is associated with an object, the position tracking system being configured to track a position of the object and further comprising a plurality of additional RF transmitters associated with the object and in communication with the plurality of RF receivers to provide at least three pseudo-noise code modulated RF signals to provide three-dimensional orientation information of the object.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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