Channelized bearing processor

摘要

PCT No. PCT/GB91/00985 Sec. 371 Date Dec. 18, 1992 Sec. 102(e) Date Dec. 18, 1992 PCT Filed Jun. 19, 1991 PCT Pub. No. WO91/19995 PCT Pub. Date Dec. 26, 1991.A channelised bearing processor comprises a channelised receiver consisting of a plurality of i.f. receivers (34 to 42) covering contiguous parts of a predetermined frequency range. Each of the receivers (34 to 42) is connected to a respective, continuously energised local oscillator (35 to 43). A plurality of direction finding antennas (10 to 15) are coupled to respective receiving channels for producing an amplitude signal. Each receiving channel includes a tunable i.f. receiver (24A to 24F) having an input (26A to 26F) for a local oscillator signal. A local oscillator selector (50) is responsive to an output from one of the channelised receivers (34 to 42) to connect the local oscillator (35 to 43) connected to that one of the channelised receivers (34 to 42) to the local oscillator signal inputs (26A to 26F) of the tunable i.f. receivers (24A to 24F) in the receiving channels.