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Originally posted by BASSPLYR
If the radar uses only one bandwidth wouldn't it be very easy to track the aircraft when it's using it's radar by using maybe even passive arrays to detect that specific radar frequency?
Is the broadcasting of radar from a source outside the B2 on the same bandwidth the B2 is using basically the same thing as flooding a room with infrared light to blind a night vision camera?
Originally posted by neformore
Well, at least there will be less contrails, eh?
Both stories make the US military procurers and overseers look as dumb as a box of rocks. You'd think that someone, somewhere would have realised the potential problems....
The world is going mad.
The B-2 is fitted with an AN/APQ-181 radar, with some similarities to the AN/APG-70 used on the F-15E Strike Eagle fighter. The AN/APQ-181 is a Ku band (high microwave, from 12 GHz / 3 centimeters to 18 GHz / 2 centimeters) radar, with an electronically steered antenna in the lower leading edge of each wing. The Ku band suffers from greater atmospheric attenuation than lower frequency bands, but it also provides very high resolution for navigation and targeting.
The AN/APQ-181 provides "low probability of intercept (LPI)" operation, with the radar dancing over frequencies and changing pulse patterns so that its signals can't be picked out of background noise until it's too late. Apparently the TACIT BLUE program did much to advance LPI radar technology; it would have made absolutely no sense to design a stealthy battlefield surveillance aircraft and then have it announce its presence by blasting out strong and easily detected radar signals. The AN/APQ-181 provides 20 operational modes, including a "Synthetic Aperture Radar (SAR)" mode for ground mapping, with a "Ground Moving Target Indicator (GMTI)" capability; a "Terrain Following / Terrain Avoidance (TF/TA)" mode for low-level flight; a mode for spotting and linking up with a tanker; and weather mapping and navigation modes.