Patent ID: 8077089

Claim:
A method of geolocating a moving transmitter at position {right arrow over (X)} o (t) observed by a plurality (N) of moving collector devices at positions {right arrow over (X)} i (t), comprising: (1) obtaining (N−1) wavelength-scaled phase difference measurements taken from independent pairwise combinations of the plurality of moving collector devices at a plurality of discrete times, the first measurement taken at k=0, according to ΔΦ ij =Φ j ( k )−Φ i ( k ), and Φ i ( k )=| {right arrow over (X)} i ( k )− {right arrow over (X)} o ( k )|/λ+Θ i where: i and j are each one of the plurality of collectors (i,j=1, 2, . . . , N) Θ i and Σ j are unknown constant phase offsets of the plurality of moving collector devices, λ is the transmitter wavelength, and k is the discrete time; (2) differencing said plurality of the (N−1) wavelength scaled phase difference measurements, resulting in a plurality of values of range differences to the transmitter associated with pairwise combinations of receivers; (3) on the basis of the plurality of values of range differences to the transmitter associated with pairwise combinations of receivers, calculating a lattice of points representing potential transmitter locations; (4) repeating steps 1-3 over time as at least one receiver is moved, resulting in multiple lattices of potential transmitter location; (5) comparing the lattices generated by steps 1-4 to narrow the selection of potential transmitter locations.