User's Manual

SBS-900 Shore Based Radar Systems
Chapter 5: Technical overview
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 29 of 240
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SharpEye
TM
transceiver technology radically departs from conventional marine navigation transceivers
through the transmission of low power RF pulses and application of pulse compression and Doppler
techniques. The technology benefits from the following:
' Solid state transmitter for high reliability ' Dynamic range of 126 dB (including sensitivity
time constant (STC) & pulse compression gain)
' Digital pulse compression ' Minimum discernible signal (MDS) of
-125dBm
' Receiver noise figure <5.5dB ' Internal monitoring, no external components
required to monitor operation
' Pulse Doppler processing for improved rain
and sea clutter rejection
' Range discrimination: 7.5nm (24nm) and
15nm (48nm)
Solid state technology: Solid state transistors obviate the need for a warm-up time. When the
Radar Distribution Unit is switched ON the SharpEye
TM
is powered.
When a Run command is received by the transceiver, it is ready for
transmission within 40 seconds.
Output power: When transmitting, the amplifiers generate a nominal peak power of
170Watts with a maximum duty cycle of 13% at the transceiver
output flange.
System monitoring: Comprehensive built in test (BIT) facilities within the transceiver
provide on-line monitoring of the following parameters within the
transceiver:
' RF power ' Antenna system
VSWR
' Power supplies
' Temperature ' Receiver
sensitivity
' Antenna rotation
data
Should the system detect a fault condition which could lead to early
failure of the transceiver, i.e. a high VSWR, then the transceiver
switches to a low power state which permits transmission to continue
in the short term. The built in test monitoring also ionjonm [ •Kiq QE
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event of single or multiple transistor failures.
SBS-900 Range:
System ID
SharpEye
TM
Transceiver
Doppler
Frequency
Diversity
SBS-900-1 X-band
& %
SBS-900-2
X-band
& &
SBS-900-3
X-band
(dual redundant)
& &
SBS-900-4
X and S-band
(dual transceiver)
&
(X & S-band)
&
(X-band only)
SBS-900-51 S-band
& %