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Pulsed RADAR Transmission
- Transmits short bursts.
- Followed by listening period.
- Uses same aerial transmission and reception.
Pulsed-Doppler
- Transmitted a certain frequency.
- Frequency of received signal will higher or lower.
- Used to detect target and determine its relative velocity.
- Range can be found with normal echo-ranging techniques.
Components
- Synchroniser.
- Transmitter.
- Modulator.
- Antenna.
Synchroniser
- Synchronises operation of transmitter and indicator.
- Generates continuous stream of short, evenly spaced pulses.
- Master trigger sets PRF.
- Sweep generator positive sweep gate used to turn receiver ON or OFF.
- Sweep generator negative sweep used to un-blank display.
- Sweep generator reference sweep deflects electron beam in correct direction.
- Produces range rings.
- Produces marker heading.
Transmitter
- Produces pulse of high-powered RF energy, at the correct time, then fred to antenna.
- Passes information regarding frequency of transmission to receiver for AFC circuits.
- Operate over wide range frequency and power ranges.
Modulator
- High-voltage pulse supplies to magnetron from modulator circuit.
Antenna
- Mounted in a fixed position.
- Beam scanned by individually controlling phase of radio waves transmitted and received by each radiating elements.
- Employs grid of T-R cells.
- AESA provides 10-30x more capability.
- Multiple T-R modules means a failure of up to 10% of T-R modules will not cause loss of antenna.
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