pulse repetition frequency वाक्य
उदाहरण वाक्य
मोबाइल
- 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.
- 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.
- Later in the war, " Freya " operated in the band from ( 120 to 130 kW, and a pulse repetition frequency of 500 Hz.
- 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.
- Pulse repetition frequencies ( PRF ) of 750, 1200, and 2400 pulses / second are used for the long, medium, and short pulse modes, respectively.
- 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 ).
- 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.
- 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.
- 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.
- 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.
- The X-axis input was connected to a sawtooth voltage generator known as a time base generator that swept the spot across the display, timed to match the pulse repetition frequency of the radar.
- The raw return signal from a reflection will appear to be arriving from a distance less than the true range of the reflection when the wavelength of the pulse repetition frequency ( PRF ) is less than the range of the reflection.
- It was found that at least five pulses needed to be returned in order for the target to become visible on the scope, so the rotation rate of the antenna was adjusted to synchronize with the pulse repetition frequency of the radar.
- To address this problem, the system was later provided with a second pulse repetition frequency at 12.5 pps, which meant that a reflection would have to be from greater than before it would be seen during the next reception period.
- The system comprises a family of electronic warfare suites, such as Ajanta and Ellora, for use on different naval platforms capable of intercepting, detecting, and classifying pulsed, carrier wave, pulse repetition frequency agile, frequency agile and chirp radars.
- Because the external radar causing the transponder to respond is generally not synchronised with your own radar ( i . e . different PRFs [ pulse repetition frequency ] ), these black dots appear randomly across the display and the operator sees through and around them.
- If a mode-locked laser is modulated to form a train of pulses, its spectrum is seen to consist of the carrier frequency surrounded by a closely spaced comb of optical sideband frequencies with a spacing equal to the pulse repetition frequency ( Fig . 16 ).
- These early-model Seetakt systems were followed in 1939 by a modified version known as " Dete 1 ", operating between 71 and 81.5 cm wavelength ( 368 to 390 MHz ) at 8 kW peak and a pulse repetition frequency of 500 Hz.
- The system could be operated at four frequencies between 2, 700 and 2, 800 MHz ( 10 11 cm wavelength ), sending out 300 kW pulses of 0.8 microseconds in duration with a pulse repetition frequency ( PRF ) of 1, 707 pulses per second.
- The delay was carefully tuned to delay the signals some multiple of the time between pulses ( the pulse repetition frequency ), as that way the delayed signal from an earlier pulse would exit the delay unit at the same time as a newer pulse was being received from the antenna.
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