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TiltVariance
[T02, ratio] = TiltVariance([PropDir],alpha,TxD,[RxD],Atm,...
[fmin],[L0],[TOL])This function calculates tilt variance in a limited band and the ratio of the band-limited tilt variance to the full band tilt variance. The input PropDir sets the direction of propagation and indicates at which point tilt is to be measured. 'BACKWARD' and 'FORWARD' calculate tilt on a focal plane. 'BACKWARD-AP' and 'FORWARD-AP' calculate tilt in the aperture plane.
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Parameters |
Description |
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PropDir [string] |
(Optional) Propagation direction. 'BACKWARD' (default), 'FORWARD', 'BACKWARD-AP', or 'FORWARD-AP' |
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alpha [scalar] |
Turbulence multiplier |
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TxD [scalar] |
Transmit aperture diameter (m) |
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RxD [scalar] |
(Optional) Receive aperture diameter (m). Defaults to zero (focused beam). |
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Atm [struct] |
Discrete atmospheric structure from AtmStruct with turbulence profile |
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fmin [scalar] |
(Optional) Minimum spatial frequency present (1/m). Defaults to zero. |
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L0 [scalar] |
(Optional) Outer scale of turbulence. Defaults to inf unless contained in Atm. |
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TOL [scalar] |
(Optional) Relative tolerance for quad. Default is 1e-6. |
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Return Values |
Description |
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T02 [scalar] |
Full tilt variance in band (${rad}^2$) |
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ratio [scalar] |
Ratio of tilt variance in band to full tilt variance over all frequencies |
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Copyright (c) 2009. All rights reserved.
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Description