Site of WP/RASS

A 404 MHz wind profiler/Radio Acoustic Sounding System (RASS) fabricated by the Society for Applied Microwave Electronics Engineering & Research,(SAMEER), Mumbai has been commissioned for utilization in the R & D mode at the India Meteoroloical Department(IMD) , Pune.

The system is capable of measuring all three components of vector wind Viz. zonal, meridional and vertical wind velocities. The system as configured has a typical height coverage of 6-10 kms (depending on weather conditions) with a resolution of 300 meters for wind.  In the  Rass option for temperature measurement height coverage is 2-3 kms .


Antenna

Technical Specifications

Operating Frequency

404.37 MHz ± 0.250 MHz

Pulse repetition Period

60 Micro sec / 160 Micro sec

Pulse Width

2 Microsec(uncoded)/16 Micorsec (coded)

Peak Transmit Power

16 KW

Duty Ratio

10 % Maximum

Maximum Unambiguous radial velocity / resolution

15.7 mps / 0.2 mps

Number of Coherent Integrations

76 selectable

Number of incoherent Integrations

10

Number of FFT Points

256 / 512 selectable

Acoustic Out put power for RASS mode

100 Watt (nominal)

Type of Antenna

Parabolic reflector with acoustic transducer

Range of Acoustic frequencies for RASS

940 to 980 Hz

Duplexer

Radar Control Room houses a high power RF transmitter, duplexer and sensitive receiver / signal processor. Duplexer connects transmitter to the antenna during transmission and switches to the receive port when the high power transmit pulse has passed.