Importance

Loading Importance Indicators...

Abstract

Conventional airborne DF systems which process wideband angle of arrival information include at least one remote portion having an antenna and pre-amplification means, located at the wingtip or tail assembly, at which signals are received and processed, and a centrally located portion at which video information is processed and displayed. Each of the remote portions is connected to the central portion by a separate set of video frequency transmission lines. The present invention permits the high sensitivity detection of signals through the synchronous tuning of the channels of a superheterodyne receiver. At each remote portion, a local oscillator signal is produced in accordance with a frequency determining signal which is generated at the central portion. An IF signal is derived from a combination of the signal received by the antenna and the local oscillator signal. The IF signal is transmitted to the central portion and the frequency determining signal is received from the central portion by means of one or more of the video transmission lines. At the central portion, the IF signal is received and processed to derive the required information, which is then displayed. Further, the frequency determining signal is generated and transmitted to each remote portion. In this manner, the local oscillator at each of the remote portions is synchronously tuned without requiring additional RF transmission lines.

Loading the Abstract Image...

First Claim