PAR-1
Description of the radar set, tactical-technical characteristics
| Specifications | |
|---|---|
| frequency: | 9 000 … 9 160 MHz
(X-Band) |
| pulse repetition time (PRT): | |
| pulse repetition frequency (PRF): | 2 000 Hz |
| pulsewidth (τ): | 0.5 µs |
| receiving time: | |
| dead time: | |
| peak power: | 22 kW |
| average power: | 220 W |
| instrumented range: | 10 NM (≙ 18 km) |
| range resolution: | 80 m, 1.2° |
| accuracy: | 2% |
| beamwidth: | course: β= 0.8°; ε= 2°
glide: ε= 0.5°; β= 3.6° |
| hits per scan: | |
| antenna rotation: | 2 AZ, 2 EL scans per second |
| MTBCF: | |
| MTTR: | |
PAR-1
The PAR-1 was the world’s first precision approach radar for civil airports.
It operated with two sector-swiveling antennas: a more oval one with horizontal polarization for the heading and a narrower one with vertical polarization for the glide path. Both antennas could be switched to circular polarization. One transmitter fed both antennas and used a mechanically tunable magnetron of type 2J51 operating in the X-band.
The radar supplied two workstations for air traffic controllers, each with a Beta Scan Scope equipped with a 10-inch picture tube for the close range (3 miles) and the far range (10 miles).
The radar was developed by Gilfillan in 1947 and built by ITT-Gilfillan after its merger with ITT. It was the direct predecessor of the AN/FPN-33 but was still reduced in the transmitter’s power.