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In sci.physics Fred Bloggs wrote:
wrote:
TRR - Target range radar; tracked the target in range in ECM, frequency
agile to defeat ECM, elevation and azimuth provided by the ECM source
How exactly did that mode work, tracking target range but using EW
interference for az/el? How could you not know your az/el if you're
getting detections from your pulse?
The TRR was slaved in azimuth and elevation to the TTR.
The TTR had the required hardware to track in azimuth and elevation.
When jammed, the TTR tracked the jamming source.
Jammers have to behave somewhat suicidally. I've tracked real-world jamming
sources and they are very easy to track because they put out one heck of a
signal. In Vietnam, our jamming planes were called "Wild Weasels" and were
often short-lived.
The TRR provided only range information.
The TTR was X band.
The TRR was Ku band and frequency agile to get around the jamming.
In Hawk the TRR was called the ROR, range-only-radar. But the frequencies
and the function were the same. In Hawk, range information could be
optional, since the missile homed. In Nike, range information was critical,
because the missile was a remote controlled airplane of sorts.
Hawk was later augmented with optical tracking based on a telescope, a TV
camera, and sometime after that, an IR imager.