Patent ID: 8711037
Filing Date: 2014-04-29
Classification: G01S

Abstract:
1. A method for estimating the location of a transmitter transmitting a signal having a wavelength λ, the method comprising: receiving a signal from the transmitter at a first receiver; receiving a signal from the transmitter at a second receiver; moving the second receiver with respect to the first receiver; comparing the signal received by the second receiver and the signal received by the first receiver; at a first time, determining a first phase difference between the signal received by the second receiver and the signal received by the first receiver; at a second time, determining a second phase difference between the signal received by the second receiver and the signal received by the first receiver; scaling the first phase difference and the second phase difference by λ resulting in a first and a second wavelength scaled phase difference measurement; subtracting the first wavelength scaled phase difference measurement from the second wavelength scaled phase difference measurement, resulting in a differenced wavelength scaled phase difference measurement, and determining, from the differenced wavelength scaled phase difference measurement, that the transmitter lies on a hyperboloid having a first focus at the location of the second receiver at the first time, and a second focus at the location of the second receiver at the second time.