The block diagram of ST radar shows the various sub-systems of the radar and how they areinterconnected. System works on 3 phase 415V AC 50 Hz electric supply. Then electric supplyis connected to four UPSs which in turn are connected to 12 numbers of high power AC-DCsupplies (48 V DC) placed in four Sub-Control Rooms. 48 V DC supply is routed from thesecontrol rooms to antenna array to power 576 T/R modules. Mains supply is also carried tofifth Sub-Control Room known as Master Control Room (MCR) where it connects to the fifthUPS. Its output gives supply to radar controller, radar display unit, digital receiver & excitersub-system and digital receiver interface (DRI) unit.

SYNC and CAN signals are distributed from MCR to four Sub-Control Rooms and then toAntenna Array to feed each of 576 T/R Module units. CAN provides connectivity betweenRadar Controller and 576 T/R Module Controllers (TRMC) sitting in each T/R Module. Theradar parameters are downloaded to each TRMC by Radar Controller over the CAN interface.Each TRMC has an FPGA which generates all the control signals for that T/R Module. The SYNCSignal is generated by FPGA in the Digital Receiver. Sync Signal is like an IPP with a width of1µs and variable PRF. TRMC signal generation starts after sync signal. SYNC signals aredifferential signals and routed to each T/R Module separately.

System clock is 10 MHz OCXO which is used as reference source. It locks 212.5 MHz PLL whichis amplified and fed to 576 T/R Modules through chain of power divider/combiner networkplaced in the Antenna Array field. During reception, signals are combined coming out of thereceive section of T/R Module through the same set of power dividers/combiners and fed todigital receiver through DRI unit for further processing. The digital receiver generates I andQ signals at base band level and the same is decoded, in case of coded transmission,coherently integrated and spectral estimation is done using FFT techniques in real time toestimate the three spectral parameters viz., received power, Doppler and spectral width.The data is displayed on a high end graphical work station. Graphical Display of wind data isshown in standard display formats. The Radar controller is the interface between operatorand the Radar. It generates the operating parameters of the wind profiler, selects the beampositions and sets the Radar for collecting the data in different operating parameters.