449 MHz Modular Wind Profiler Development MAC update September 2012 William Brown Brad Lindseth,...
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![Page 1: 449 MHz Modular Wind Profiler Development MAC update September 2012 William Brown Brad Lindseth, Charlie Martin, Jen Standridge, Tim Lim, Lou Verstraete,](https://reader035.fdocuments.in/reader035/viewer/2022062413/5a4d1b477f8b9ab0599a3c21/html5/thumbnails/1.jpg)
449 MHz Modular Wind Profiler DevelopmentMAC update September 2012
William Brown
Brad Lindseth, Charlie Martin,Jen Standridge, Tim Lim, Lou Verstraete,Steve Cohn, Terry Hock
With help from:Jim Jordan, Dan Law, Warner Ecklund (NOAA)
EOL MAC 27 Sept 2012
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449 MHz Modular Wind Profiler• Development to extend our wind profiler capabilities
• Longer wavelength enables higher altitudes
• Fast wind measurements (spaced antenna)
• Modular to give more flexibility
• Combine modules to make radars of varying sizes
• Easy to deploy
• No clutter screen
• Light-weight modules
HexagonalModule
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Modularity
3-panel system2 kW ampProfiles through boundary layer
7-panel system8kW or 16kW ampProfile to mid-troposphere
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3-panel PCAPS deployment
Winter cold pool study, Salt Lake valley
915 MHz
449 MHz
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3-panel 449 MHz Comparison with 915 MHz
449915 High
915 Low
Winds percentagevs. Height
• Altitude coverage about 1 km greater
• 2 months
• Median abs diff ~ 1.5 m/s
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7-panelLatest developments
Expansion to 7 panelsSo far using:2 kW TX amp3 channel data system
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915 cf 7-panel 449915MHz high mode 449MHz 7-panel
7-panel 449 typically seeing 1 – 2 km higher
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Yesterday
Vertical velocity & 5 minute winds
Note strong updraft
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Current WorkCompleting 7-panel system: • 7-channel data system• Dual 8kW amplifiers• Upgraded front-end boxes• Mounting frame• Analyzing tests
Limitations:• Limited range resolution (~ 150m)• Processing and algorithms need work• Can see higher than 915s, but not low gates• Clutter, RFI & artifact rejection
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Next steps
RIM• Range IMaging• Enables improvement in range resolution• Small inter-pulse steps in wavelength• Aiming to go from 150 m down to < 50 m• Funds identified for RIM expert to visit next summer
Improve processingReduce lowest range gateAdd diagnosticsMobile version (449 MISS)RASS (Radio Acoustic Sounding System)
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Summary Prototype systems working well Completing seven antenna modules
o One 7-panel profiler OR two 3-panel systems(Two BL or one mid-troposphere profiler)
o Adding power (16kW) and data channels (3->7) Next Steps
o Adding RIMo RASS, diagnostics, Mobile, lower gates, processing
Three user proposals received already Front-Porch, DEEPWAVE, PECAN Test deployments : local and Metcrax Promising technology, but some limitations
Longer term: Ship operations Full 19-module system