Patent ID: 7299013

Claim:
A method for correcting for Doppler frequency shift in a signal being transmitted from a mobile transmitting system to a receiving system, comprising: determining a velocity vector for each of the receiving system and the transmitting system, relative to a common reference frame that operation of both the transmitting system and the receiving system are referenced to; determining a unit vector representing a position of said receiving system relative to said mobile transmitting system; from the velocity vector and the unit vector, determining a Doppler frequency shift parameter that said receiving system, if stationary, would experience when receiving said signal from said mobile transmitting system; adjusting a frequency at which said signal is transmitted, using said determined Doppler frequency shift parameter, to cancel said Doppler frequency shift caused by travel of said mobile transmitting platform relative to said receiving system; and wherein the signal comprises an electromagnetic wave signal, and wherein determining said Doppler frequency shift parameter comprises using a formula: Δ f T =f 0 r TR ·V T /c where: Δf T =Doppler shift imparted by motion of the transmitting system; f 0 =a nominal carrier frequency of said electromagnetic signal; r TR =represents the unit vector; V T =the velocity vector c=the speed of light •=a vector dot product.