Doppler Weather Radar - METNET - India Meteorological Department

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1.10.3. BITE Processor will cause the malfunctioning units to be switched off automatically. An acoustical alarm will also be generated for warning the operator. B.2. Capabilities of Doppler weather radars The Duty Asstt. /Radar Operator (the one who is) operating the Doppler Weather Radar must have the knowledge of following general information about capabilities of Doppler Weather Radar systems. The state of art WSR-98D/S, S-band Pulsed Doppler Weather Radar systems have the following capabilities: B.2.1. Modes of operation The system has capabilities of operation in computer controlled mode for round the clock observations and archive of raw data and radar images in GIF format: B.2.2. Parameters to be measured a. Reflectivity b. Radial velocity (radial velocity). c. Spectrum Width B.2.3. Observation range a. Reflectivity- 500 km b. Velocity- 250 km B.2.4. Spatial resolutions a. Reflectivity- 300m or better b. Velocity- 150m or better B.2.5. Measurement accuracy a. Reflectivity - Minimum 2 dB absolute accuracy at 250 km for rainfall equivalent to 23 dBZ (1 mm/hr) at antenna rotation of 2 revolutions per minute (RPM) b. Velocity - Minimum 1 m/sec at 250 km for rainfall equivalent to 23 dBZ reflectivity at antenna rotation of 2 RPM. c. Spectrum Width - Minimum 1 m/sec at 250 km for rainfall equivalent to 23 dBZ reflectivity at antenna rotation of 2 RPM. 64
B.2.6. Unambiguous range a. Reflectivity mode - 500 km or better. b. Doppler mode - 125 km (subject to Para 2.6.1 b) B.2.6.1. Ambiguity resolution a. In the Doppler mode, the System has facility for unfolding velocities four times the nyquist velocity to overcome the restriction imposed by range-velocity dilemma (Doppler dilemma). The algorithm proposed and used is having capability of unfolding velocities in cases of non-overlaid echoes as well as for overlaid echoes. b. Ambiguity resolution techniques for automatic generation of unambiguous velocity at least up to ±60 m/sec at 250 km range and 2 RPM scan rate is provided. B.2.7. Product generation The DWR system is capable of generating the following types of products: a. Base products b. Primary products c. Derived products The System has provision for display and archival of the products also. B.2.7.1. Product range: i. Reflectivity - 0 - 500 km or better ii. iii. Velocity - 0 - 250 km or better Spectrum Width - 0 - 250 km or better B.2.8. Operating environmental conditions For optimum operation of Doppler weather radars, the following Environmental conditions should be maintained for 24 × 7 operational. The system must have the capabilities of operation in a tropical coastal environment under following environmental conditions specified below: 1. For DWR Antenna, Pedestal and Radome: a. Temperature 0 to 55° C 65
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Ministry of Earth Sciences INDIA ME
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Preface Introduction Definitions Pu
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3.8 To copy RAW DATA 35 3.9 Procedu
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B.3.3 Velocity Products 69 B.3.4 Hy
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PREFACE India Meteorological Depart
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DEFINITION An important aspect of a
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MONITORING OF DWR SYSTEM CHAPTER 1
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Before controlling radar operations
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5. Power Cabinet: “SERVO POWER AM
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9. Checking real time displays:-The
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2. In Modem, PMA always shows off w
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This can be done by “telnet” co
Page 25 and 26: drwxr-xr-x 3 501 500 4096 Aug 10 02
Page 27 and 28: Figure 1.8 Connecting to MAIN serve
Page 29 and 30: Thus now the tasks are configured a
Page 31 and 32: STEP 1 : Invoke “iris” though t
Page 33 and 34: STEP 6 : Skip time : This is the ti
Page 35 and 36: 3. Edit the Product as needed , the
Page 37 and 38: (ii) SC. (E) In-Charge Radar Lab, D
Page 39 and 40: Station and print-out (except Daily
Page 41 and 42: 2.2.5. A-log book Details of all ad
Page 43 and 44: Table 2.8 VPN connectivity status S
Page 45 and 46: Step-II. connected Copy image files
Page 47 and 48: 3.7. To search for a file [operator
Page 49 and 50: PCO name: IMD-B, TCO name: IMD-B PR
Page 51 and 52: # Filename: transmet_gif # Sends fi
Page 53 and 54: 9. To liaise with other DWR station
Page 55 and 56: • Detection of deterioration caus
Page 57 and 58: ack-mounted modules which do not re
Page 59 and 60: Screenshot 2 : Calibration Control
Page 61 and 62: Antenna Waveguide Switch, Circulato
Page 63 and 64: 4.3.3 Bitex data point configuratio
Page 65 and 66: APPENDIX A AN OVERVIEW OF DOPPLER W
Page 67 and 68: A.1.1. Future IMD Radar Network pla
Page 69 and 70: IRIS/Display Installed at remote wo
Page 71 and 72: APPENDIX B WSR 98D/S DWR SYSTEM CHA
Page 73 and 74: e. Elevation limits -- Upper and lo
Page 75: B.1.9. Calibrations and health moni
Page 79 and 80: The System is capable of generating
Page 81 and 82: 1. System generates hail, thunderst
Page 83 and 84: 1.5. There is provision of DVD Writ
Page 85 and 86: 6. Wait for ten minutes. Calibrate
Page 87 and 88: SA9-15 Current at position 15 of A1
Page 89 and 90: Test procedure (1) Type the “zaut
Page 91 and 92: 4. Observe that the PFN voltage goe
Page 93 and 94: Table D.1. PPI and RHI scanning typ
Page 95 and 96: According to the need of IMD, purpo
Page 97 and 98: Chennai@8min, Machilipatnam, Vishak
Page 99 and 100: D.2.5. Scan strategies being follow
Page 101 and 102: High Voltage (Power On) Avoid conta
Page 103 and 104: Average power densities less than 5
Page 105 and 106: E.3. Antenna/Pedestal Safety WARNIN
Page 107 and 108: ACKNOWLEDGEMENTS Several experts ha
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