The receiver periodically scans across the frequency band and determines various parameters of the received signals, like frequency, signal shape, direction of arrival, pulse repetition frequency, etc . By using these measurements, the signals are first deinterleaved to sort the mixture of incoming signals by emitter type.
42.
The radar was adapted too, adding a switch that changed the pulse repetition frequency from 2, 500 to 930 Hz, stretching the maximum range to ( it takes 1.073 milliseconds for light to travel 100 miles and back, 1000 ms / 1.073ms is 931 Hz ).
43.
The pulse repetition frequency is locked to that of the frequency standard, and the frequencies of the comb elements at the red end of the spectrum are doubled and heterodyned with the frequencies of the comb elements at the blue end of the spectrum, thus allowing the comb to serve as its own reference.
44.
This removed any static reflections, like nearby hills or other objects, leaving only the moving objects, such as aircraft . This basic concept would work for a long-range radar as well, but had the problem that a delay line has to be mechanically sized to the pulse repetition frequency of the radar, or PRF . For long-range use, the PRF was very long to start, and deliberately changed in order to make different ranges come into view.
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