Typically RWRs store the detected pulses for a short period of time, and compare their broadcast frequency and pulse repetition frequency against a database of known radars.
22.
Nor does the AESA have any sort of fixed pulse repetition frequency, which can also be varied and thus hide any periodic brightening across the entire spectrum.
23.
Later in the war, " Freya " operated in the band from ( 120 to 130 kW, and a pulse repetition frequency of 500 Hz.
24.
Because of the low pulse repetition frequency ( PRF ) of most coherent pulsed radars, which maximizes the coverage in range, the amount of Doppler processing is limited.
25.
Pulse repetition frequencies ( PRF ) of 750, 1200, and 2400 pulses / second are used for the long, medium, and short pulse modes, respectively.
26.
Early MTI systems generally used an acoustic delay line to store a single pulse of the received signal for exactly the time between broadcasts ( the pulse repetition frequency ).
27.
The system used two 5J26 magnetrons at 750 kW peak power, operating at 1300 MHz a 400 Hz pulse repetition frequency ( prf ) and 2 microsecond pulse width.
28.
In older radar systems, through the 1980s, lock-on was normally assisted by a change in the radar signal characteristics, often by increasing the pulse repetition frequency.
29.
With the change of range, the radar doubled its pulse repetition frequency and as a result, the Metox beeping frequency also doubled, warning the commander that he had been detected.
30.
Using a 50 cm ( 600 MHz ) magnetron from Philips, their first transmitter was modulated with 2-?s pulses at a pulse repetition frequency ( PRF ) of 2000 Hz.
