Changes between Version 2 and Version 3 of Processing/LeverArmOffset


Ignore:
Timestamp:
Mar 11, 2008 10:45:37 AM (12 years ago)
Author:
benj
Comment:

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  • Processing/LeverArmOffset

    v2 v3  
    2222----
    23232006 obs and results as follows:
     24
     2511th Mar. 2008: Note that the email below were the numbers as originally received, but calculation of the Gamma angle contains an error - "gam = acos( abs(dz) / dst )" should use asin, not acos. Del and Dst are unaffected. Investigation of this suggests this causes an along-track error of approx. 1.5m in all 2006/2007 delivered data for ATM, which may be partially corrected by boresight correction (since these numbers were computed using the incorrect lever-arm numbers) depending on flight altitude. Other sensors have smaller errors, since the effect of the original calculation error is smaller for the offset angles of these sensors. Correct lever-arm numbers are below for reference, new boresight numbers would need to be computed to use these.
     26
     27Corrected 2006/7 lever-arm numbers
     28||       ||  Gam  ||   Del     ||  Dst  ||
     29|| ATM   || 1.306 ||  0.006353 || 1.741 ||
     30|| Casi  || 1.098 ||  0.007934 || 1.702 ||
     31|| Eagle || 0.873 ||  0.000781 || 1.994 ||
     32|| Hawk  || 0.806 ||  0.000682 || 2.117 ||
    2433
    2534{{{