Method for improving performance of a SODAR system
AssigneeElectro Magnetic Measurements Pty Ltd
InventorAndrew Louis Martin
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Abstract
This invention relates to a method of improving performance of a SODAR system adapted to locate discontinuities in the atmosphere by transmitting pulse compression signals such as a plurality of acoustic chirps, the method comprising: transmitting one or more acoustic chirps; receiving one or more acoustic echoes of the transmitted chirps; processing the acoustic echoes to provide an indication of the discontinuities in the atmosphere, thereby providing a wind shear profile; processing the wind shear profile to correct systematic Doppler errors associated with the acoustic echoes by: subtracting a first measured wind speed from the wind shear profile; and adding a second measured wind speed to the wind shear profile.
Claims13
A method of improving performance of a SODAR system adapted to locate discontinuities in the atmosphere by transmitting pulse compression signals such as a plurality of acoustic chirps, the method comprising:
- transmitting one or more acoustic chirps;
- receiving one or more acoustic echoes of the transmitted chirps;
- processing the acoustic echoes to provide an indication of the discontinuities in the atmosphere, thereby providing a wind shear profile;
- processing the wind shear profile to correct systematic Doppler errors associated with the acoustic echoes by:
- subtracting a first measured wind speed from the wind shear profile;
- and
- adding a second measured wind speed to the wind shear profile;
- wherein the second measured wind speed is measured by an anemometer.
A method of improving performance of a SODAR system adapted to locate discontinuities in the atmosphere by transmitting pulse compression signals such as a plurality of acoustic chirps, the method comprising:
- transmitting one or more acoustic chirps;
- receiving one or more acoustic echoes of the transmitted chirps;
- processing the acoustic echoes to provide an indication of the discontinuities in the atmosphere, thereby providing a wind shear profile;
- processing the wind shear profile to correct systematic Doppler errors associated with the acoustic echoes by:
- subtracting a first measured wind speed from the wind shear profile;
- and
- adding a second measured wind speed to the wind shear profile;
- wherein processing the wind shear profile to correct systematic Doppler errors further comprises application of a correction factor to the wind shear profile to provide a corrected wind shear profile at a plurality of height segments;
- wherein the correction factor is calculated using a correction algorithm;
- and
- wherein the algorithm provides a multiplying correction y to be applied at each of the plurality of height segments given by:
- y=C×ha
- where h is the height in metres, C is a system dependent constant derived from calibration data and a is an exponential constant.
Dependencies are inferred from the claim text.