Description of the radar set, tactical-technical characteristics
Figure 1: AN/TPN-22
|frequency:||9 000 … 9 200 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||1 200 Hz|
|pulsewidth (τ):||0.8 µs|
|peak power:||120 kW|
|instrumented range:||3 NM (≙ 5.5 km)|
|hits per scan:|
The AN/TPN-22 all-weather landing subsystem (ALS) is a Precision Approach Radar (PAR). It is a transportable, computerized, pencil beam, 3-dimensional radar which is used for landing tactical aircraft. It is a part of the U.S. MATCALS program.
The AN/TPS-22 handles all civil and military air traffic by providing:
- Mode I: fully automatic landing capabilities;
- Mode II: ILS guidance commands to the aircraft (a crosspointer cockpit display)
- Mode III: conventional PAR, ground controlled approach (“talk down”)
The antenna uses circular polarization only. It is a planar phased array of 94 radiator groups each with a PIN-Diode phase shifter. It uses phase controlled electronically beam steering; and has an 8 degree (-1 to +7 degree) angular coverage in elevation.
The AN/TPN-22 is a track-while-scan radar. It tracks up to six aircrafts. The MTI capability includes search (2-pulse canceler) and track (3-pulse canceler).
The transmitter contains a traveling wave tube as power amplifier. It got a solid-state modulator as modernization.