1. Introduction
The FitACF algorithm is used to derive doppler velocities, spectral widths and powers from the raw ACF data. Listed below is the C data structure struct FitData used to store the fitted ACF data.
2. Array Limits
The array limits are defined as macros in the header superdarn/limit.h.
3. struct FitData
The fitted ACF data structure is defined in the header superdarn/fitdata.h.
struct FitData {
struct {
int major; /* major revision */
int minor; /* minor revision */
} revision;
struct FitNoise noise; /* noise parameters */
struct FitRange rng[MAX_RANGE]; /* ACF range data */
struct FitRange xrng[MAX_RANGE]; /* XCF range data */
struct FitElv elv[MAX_RANGE]; /* elevation angle data */
};
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4. struct FitNoise
struct FitNoise {
double vel; /* velocity from fitting the noise ACF */
double skynoise; /* sky noise */
double lag0; /* lag-zero power of noise ACF */
};
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5. struct FitRange
struct FitRange {
double v; /* velocity from ACF */
double v_err; /* velocity error from ACF */
double p_0; /* lag zero power */
double p_l; /* power from lambda fit of ACF */
double p_l_err; /* power error from lambda fit of ACF */
double p_s; /* power from sigma fit of ACF */
double p_s_err; /* power error from sigma fit of ACF */
double w_l; /* spectral width from lambda fit of ACF */
double w_l_err; /* spectral width error from lambda fit of ACF */
double w_s; /* spectral width from sigma fit of ACF */
double w_s_err; /* spectral width error from sigma fit of ACF*/
double phi0; /* phase determination at lag zero of the ACF */
double phi0_err; /* phase determination error at lag zero of the ACF */
double sdev_l; /* standard deviation of lambda fit */
double sdev_s; /* standard deviation of sigma fit */
double sdev_phi; /* standard deviation of phase fit */
int qflg; /* quality flag */
int gsct; /* ground scatter flag */
char nump; /* number of points in the fit */
};
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6. struct FitElv
struct FitElv {
double normal; /* angle of arrival estimate */
double low; /* lowest estimate of angle of arrival */
double high; /* highest estimate of angle of arrival */
};
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