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Mu wrote: On Wed, 05 Nov 2003 17:41:54 +0100, Ralph Savelsberg wrote: And more in general stands for Active Electronically Scanned Array, which is the name for the type of antenna/emitter group. Instead of a mechanically swivelling antenna (with complicated waveguides and a heavy hydraulic system to move it around) this has a flat, fixed array consisting of multiple emitter/receiver modules. The beam is controlled electronically and at least in theory such a radar can use multiple modes simultaneously. In the F/A-18F (with the ACS) this could mean that for instance the pilot would have an air-to-air mode selected, while the NFO in the back could be using a ground-mapping mode at the same time. Regards, Ralph Savelsberg Ave Ralph Is this the phased array radar? And if not,wthat's the difference? Greetz Mu Technically the AESA is an active phased array radar whilst older phased array radars (like the `Flash Dance' in the MiG-31 or the APQ-164 fitted to the B-1B) are so-called passive phased array radars. The latter (passive) has a single transmitter/receiver and somehow applies a phase shift to the signals sent to various parts of the antenna, depending on the location on the antenna, whilst the former actually uses a large number of transmitter/receiver units that each operate at a different phase and possibly in a different mode. In both cases the `beam' is sent in a certain direction through adjusting the phase across the antenna, enabling a far higher scan rate, but the actively scanned array can actually generate multiple beams as well. I don't know the intricacies. Harry Andreas will probably be able to give a much more detailed answer than I can. Regards, Ralph Savelsberg |
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