Ever since radio signals were first transmitted, there has been a need to establish from which direction the signals were emanating utilising some form of Direction Finding. Early ideas used the directional properties of single receiving antennas such as the loop, the yagi or the dish, depending on the radio frequency involved.
Techniques have been developed to improve the accuracy of Direction Finding, by better antenna design, but also by using combinations of antennas, with the application of signal processing to their outputs. Of particular value at lower frequencies, signals from arrays of omni-directional antennas can be combined in either a continuous multi-channel fashion (often called 'N-channel Direction Finding Array') or via a sequentially switched arrangement ('Sequenced Direction Finding Array').
CommsAudit proven expertise at HF encompasses Direction Finding systems using signals from arrays of antennas. The CommsAudit '8-pack' CA7708 HF Receiver (Tuner/Digitiser) provides 8 phase-coherent channels suitable for 'N-channel Direction Finding' applications. Software developments can derive directional information, while also offering additional features such as separation of signals 'blind'. Similar facilities will be available up to 6GHz via the CommsAudit V/UHF Receiver (Tuner/Digitiser).
CommsAudit manufacture a switching Sequencer Direction Finding solution for up to 17 antennas (16 plus a reference) in each of 2 bands, covering 2-80MHz overall.
CommsAudit also have experience with supplying comprehensive upgrade for existing 'PUSHER, AX19, AN-FRD13<' Direction Finding Systems; the original analogue beam-forming circuitry is replaced like-for-like by a modern high-dynamic range, low-noise version; Built-In TEst (BITE) facilities simplify the maintenance overhead compared to the original. A novel concept involves the use of a CommsAudit Sequencer in combination with a 'PUSHER' Direction Finding System to provide a Goniometer-like facility.
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