As shown in Figure 1, the received signal fequency depends on the transmitted frequency, the speed of the receiver, and the true spherical angle
between the transmitter and the velocity vector of the receiver.
(62) This is a variation on an example of Yaffe's in which the angles are all spherical angles
(rather than flat angles as here) hut there is deviation from a spherical triangle somewhere between the vertices.
The typical approach to calculation of the offset angle is to first calculate the azimuth and elevation components of the threat angle of arrival at the aircraft's location -- then to set up a spherical triangle to calculate the spherical angle
between each individual antenna and the vector toward the emitter.