The high-performance carbon fibre
composite Easat EA5025 shaped reflector Primary Surveillance Radar
antenna design provides airport local or terminal area air surveillance
to a nominal 60 mile range. Retaining many of the features of the
larger Easat EA5325, the Easat EA5025 is a more compact design,
offering a cost-effective alternative. High back-angle coverage
is retained to ensure system performance can be provided at both
short and long ranges. The antenna is extremely versatile, being
capable of being operated with a co-mounted MSSR. It can be supplied
with single or dual drive motors, and a variety of encoder and rotary
joint options, including Inductosyn®. The use of these options
ensures compliancy to the most stringent operating standards.
The antenna operates at S-band (2.7-2.9
GHz) and provides a dual-beam receive capability to enhance high-angle
performance (up to 40º) whilst minimising short-range ground
returns. The two beams point at different elevation angles, the
main beam being a high-power transmit and receive beam with the
auxiliary beam used on receive only. Three states of polarisation
(linear horizontal, left-hand circular and right-hand circular)
can be provided for each beam by use of a standard polarisation-switching
capability. The antenna offers 33.5 dB of gain as standard, and
has excellent beam-shaping and sidelobe control. A weather channel
output can be made available in circular polarisation state.
