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The MTI radar uses low pulse repetition frequency (PRF) to avoid range ambiguities. Moving target indicator (MTI) begins with sampling two successive pulses. Sampling begins immediately after the radar transmit pulse ends. The sampling continues until the next transmit pulse begins.
Pulse Compressor: Frequency coded; Transmitter. Type: Grid-pulse helix TWT; Output power: 1.5 kW peak 4 percent duty cycle; Number of frequencies: More than 100; Transmission patterns : Pulse Doppler: 32-pulse batches; MTI : 4-pulse batches; Frequency agility: pulse-to-pulse frequency agility; Director pedestal
Pulse-Doppler typically uses medium pulse repetition frequency (PRF) from about 3 kHz to 30 kHz. The range between transmit pulses is 5 km to 50 km. Range and velocity cannot be measured directly using medium PRF, and ambiguity resolution is required to identify true range and speed.
Pulse width: 3.8 μs (with 400 p/s PRF) 10 μs (with 200 p/s PRF) 4 μs (nominal for MTI working) 10 μs (for non-MTI working) Aerial rotation speed 10 revolutions per minute Intermediate frequency 13.5 MHz Aerial beam width 12° (horizontal), 40° (vertical) Receiver bandwidth: long pulse 120 kHz, short pulse 330 kHz: long pulse 120 kHz, short ...
Radar transmission frequency spectrum of a cosine pulse profile. Similarly, the use of a cosine pulse profile has an even more marked effect, with the amplitude of the sidelobes practically becoming negligible. The main lobe is again increased in amplitude and the sidelobes correspondingly reduced, giving a significant improvement in performance.
To improve detection range, the signal uses a non-linear frequency ramping, spending more time at lower frequencies and thus lower angles. This produces longer, and thus stronger, returns from targets at low angles. These primary detection pulses were interspersed with dedicated moving-target indication (MTI) pulses which were purely linear ...
Intra-pulse scalloping is improved by shortening the transmit pulse or by modulating the transmit pulse. This can include frequency or phase shifting associated with pulse compression . Moving target indicator (MTI) radar reduces the impact of blind velocity by using redundant detectors that introduce a compensating reverse phase shift undoes ...
The radar features excellent anticlutter and antijamming ability, as well as very good adaptability and automatization. Incorporated techniques include dual pulse frequency diversity, pulse-to-pulse frequency agility over a wide frequency band, adaptive MTI and CFAR techniques, and an advanced computerized BITE technique.