Systems and methods of wireless position tracking
First Claim
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; and
a 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.
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Accused Products
Abstract
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.
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Citations
14 Claims
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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; and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14)
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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; and determining 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. - View Dependent Claims (10, 11, 12, 13)
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Specification