Abstract: A microprocessor receives sensor signals and produces signals proportional to total, longitudinal and lateral air speed. An omnidirectional air speed sensor uses pressure samplers on a rotating arm to produce a sinusoidal pressure differential signal related to air speed. An interrupter disc rotating with the arm periodically exposes an opto-electric sensor to light to produce a pulse phase reference signal. In one embodiment, the pulse signal operates a first ramp generator to produce an arm RPM signal and operates a second ramp generator in conjunction with the sinusoidal signal to produce an azimuth reference signal. The RPM and azimuth signals are fed to a processor to resolve the air speed into longitudinal and lateral components. In the preferred embodiment, the processor receives the pulse signal and produces a pair of out-of-phase square wave signals which control chopper modulators which demodulate the sinusoidal signal to produce signals proportional to lateral and longitudinal speed.