gps.py 文件源码

def minScalErr(stec,el,z,thisBias):
    """
    this determines the slope of the vTEC vs. Elevation line, which
    should be minimized in the minimum scalloping technique for
    receiver bias removal
    inputs:
        stec - time indexed Series of slant TEC values
        el - corresponding elevation values, also Series
        z - mapping function values to convert to vTEC from entire file, may
            contain nans, Series
        thisBias - the bias to be tested and minimized
    """

    intel=np.asarray(el[stec.index],int) # bin the elevation values into int
    sTEC=np.asarray(stec,float)
    zmap = z[stec.index]
    c=np.array([(i,np.average((sTEC[intel==i]-thisBias)
                              /zmap[intel==i])) for i in np.unique(intel) if i>30])

    return np.polyfit(c[:,0],c[:,1],1)[0]