Direction finding
6.The new radio direction-finding device could latch onto a transmission with remarkable speed.
8.The Guardrail Common Sensor (GRCS) is a corps-level airborne signal intercept, processing, direction-finding (DF), and targeting system.
9.This paper introduces a dual-channel Doppler direction finder which combines the Doppler principle with the phase difference picking method used in the interferometer direction finder. The finder can be implemented with two independent receivers of same model for direction finding of broadband signals.

