The AN/SPS-55 is a solid state, surface search and navigation radar
capable of detecting targets from as close in as 50 yards and out to 50
miles and beyond, with good target resolution.
The radar set uses several signal processing circuits to improve
operation under certain prevailing conditions:
Radar Set AN/SPS-55 consists of four major
units: antenna group, radar receiver/transmitter, radar set control, and
box switch. The system generates two selectable pulse widths. The RF
frequency is tunable from 9.05 to 10.0 GHz with a minimum peak power
out of 130 kW (measured at the magnetron). The linear array antenna,
rotating in azimuth at 16 RPM, forms a beam narrow in azimuth (1.5°)
and broad in elevation (-10° to +10°, centered on the horizon). Return target
echoes are amplified and detected by the receiver and applied to a PPI. The
target information can be displayed in either of two modes, a relative mode
where zero degrees bearing on the PPI represents the heading of the ship or a
true mode where zero degrees bearing
- Fast Time Constant (FTC) circuit - Reduces clutter by
displaying only the leading edge of the echo returns.
- Sensitivity Time Control (STC) circuit - Reduces receiver gain at
close-in ranges where clutter is strong, while allowing a gradual
return to normal gain at longer ranges where clutter is less.
- Sector Radiate Capability - Allows the operator to limit
radiation to a selectable azimuth segment to minimize interference
from other ships' radars or ECM equipment.
Sources and Resources
Maintained by Robert Sherman
Originally created by John Pike
Updated Tuesday, December 15, 1998 7:42:42 AM