Technical Manual

SRT X-BAND RADAR SYSTEMS
FUNCTIONAL DESCRIPTION
304202P003 3.3 Rev. C
Pulse Type Duration PRF
SHORT PULSE
nominal 60 ns 3000 Hz
MEDIUM PULSE
nominal 250 ns 1500 Hz
LONG PULSE
nominal 800 ns 750 Hz
− it receives the echoes reflected from targets and it converts and amplifies
them
− it monitors the unit’s correct operations
3.2.1.1 SRT Power Board
The SRT Power (Chapter 9, Figure 9.1.11) is divided into 2 units, LVPS and
HVPS; it generates all the voltage sources needed by the electronics rack from
the original 50 VDC (40÷60).
The SRT Power unit is equipped with protection circuits to avoid wrong polarity
connection, over current and over voltage spikes. A voltage sensor is connected
with microprocessor interrupt request input to provide save state function in
case of voltage fall under 40 VDC and to safely perform system shut down
without data loss.
3.2.1.2 SRT Power - Low Voltage Power Sup-
ply
The LVPS’s function (Chapter 9, Figure 9.1.13) is to generate the low DC
voltages, necessary to supply the SRT electronic circuits. As input, the circuit
receives the 50 VDC voltage. This voltage filtered and stabilized by suitable
solid state components in order to get as output:
− +5 V, -5 V, +15 V, - 15 V, +15V Iso, +24V to supply all the other
electronic circuits
− VFIL, Magnetron Heather in accordance with selected Pulse and
magnetron type.
3.2.1.3 SRT_Power - High Voltage Power
Supply
The H.V.P.S. Generator Circuit’s function (Chapter 9, Figure 9.1.14) is to
generate the high voltage (700 V) necessary to pulse transformer and to the
Magnetron for the transmission pulse generation. The signals used in this circuit
are: