LOG AMPS IMPROVE WIDEBAND DIRECTION FINDING.

This article describes a receiver that provides pulse-to-pulse signal normalization and allows successive pulses in a train to be used for the df measurement. Without signal normalization, this would be impossible since there would be no way of knowing if signal differences in channels were due to antenna patterns, emitter modulation, or propagation variances. Once a pulse-to-pulse measurement is made, time sharing of the required channels can be employed to reduce receiver complexity. The receiver, consisting of a series of multiplexing filters, detectors and a log video amplifier, is mounted in close proximity to one of several broadband df antennas, to reduce cable losses. It operates as a true amplitude monopulse system. As a consequence a very high degree of overall balance between each receiver assembly is maintained. It permits bearing measurements to be made up to a maximum signal input of plus 10 dbm.