1、 Analysis and Implementation of a Novel Single Channel Direction Finding Algorithm on a Software Defined Radio Platform John Joseph Keaveny Capter1 A radio direction finding (DF) system is an antenna array and a receiver arranged in a combination to determine the azimuth angle of a distant emitter.
2、Basically, all DF systems derive the emitter location from an initial determination of the angle-of-arrival (AOA). Radio direction finding techniques have classically been based on multiple-antenna systems employing multiple receivers. Classic techniques such as MUSIC 12 and ESPRIT use simultaneous
3、phase information from each antenna to estimate the angle-of-arrival of the signal of interest. In many scenarios (e.g., hand-held systems), however, multiple receivers are impractical. Thus, single channel techniques are of interest, particularly in mobile scenarios. Although the amount of existing
4、 research for single channel DF is considerably less than for multi-channel direction finding, single channel direction finding techniques have been previously investigated. When considering single channel direction finding systems, we find that there are two distinct types of DF systems. The first
5、type of DF system is the amplitude-based DF system. Amplitude-based systems determine the bearing of the signal (or the AOA) by analyzing the amplitudes of the output voltages from each antenna element. Amplitude DF systems include the Watson-Watt technique using an Adcock antenna array . The second
6、 type of DF system is the phase-based DF system. Phase-based systems use three or more antenna elements that are configured in a way so that the relative phases of their output voltages are unique for every wavefront angle-of-arrival. Phase-based DF systems include the Pseudo-Doppler technique with a commutative switch based antenna array . Since both of the above techniques are primarily analog techniques and have been analyzed in previous work, we will investigate a new single channel dire
