The single channel interferometer using a pseudo-Doppler direction finding system

A new technique for obtaining high performance, low power, radio direction finding, (RDF) using a single receiver is presented. For man-portable applications, multichannel systems consume too much power, are too expensive, and are too heavy to easily be carried by a single individual. Most single channel systems are not accurate enough or do not provide the capability to listen while direction finding (DF) is being performed. By employing feedback in a pseudo-Doppler system via a vector modulator in the IF of a single receiver and an adaptive algorithm to control it, the accuracy of a pseudo-Doppler system can be enhanced to the accuracy of an interferometer based system without the expense of a multichannel receiver. I will also maintain audio listen-through while direction finding is being performed-all with a single inexpensive low power receiver. The use of these techniques provides performance not attainable by other single channel methods.