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Page 1 Wind Profile Radar (WPR) at the Ogimi Wind Profiler Facility (128° 09' 32" E, 26° 40' 41" N, 225 m MSL)Principles of Wind Profile Radar (WPR) Page 2 Time Domain Integration (Coherent Integration) Page 3 Frequency Domain Integration (Incoherent Integration) Page 4 Typhoon Nari, 2001 (09/07/2001, 11:22, 2.00 ms, 8 bits) Page 5 Typhoon Nari, 2001 (09/07/2001, 14:45, 2.00 ms, 8 bits) Page 6 Path of Typhoon Nari, 2001 Page 7 Time-Altitude Cross-section of Horizontal Wind Velocity Near Typhoon Nari, 2001 Page 8 Principles of RASS (Radio Acoustic Sounding System) Page 9 Altitude-Velocity Doppler-Spectrum Distribution in RASS Observation. Page 10 Virtual-Temperature Profile by RASS Observation (09/04/2001, 15:43-15:54) Page 11 Data Flow

Altitude-Velocity Doppler-Spectrum Distribution in RASS Observation.

This represents a Doppler-spectrum altitude distribution obtained from RASS observation. The vertical axis represents distance from the radar, and the horizontal axis represents the Doppler velocity of the acoustic plane moving away from the radar. It can be seen that strong signals are received near the 340-348 m/s region, corresponding to the apparent velocity of sound. The distribution of this relatively strong signal angles to the right because the velocity of sound decreases at high altitudes, due to the lower temperatures found in these regions. The radar antennas are aimed in different directions with respect to the left and right figures, at zenith angles of 15° to the south and west, respectively.

It can be seen from these figures that the maximum observable range varies significantly depending on the antenna-beam direction. Beam direction is therefore an important factor in RASS observation.



Beam direction: zenith angle of 15° in the southern direction Beam direction: zenith angle of 15° in the western direction
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