Doppler Centroid Coefficient in Sentinal-1 Metadata

Microwave Toolbox
#1

Hello,

I am coding SAR Geocoding Algorithm. For that, I need Doppler Centroid Coefficients. These coefficients are available in the metadata file. However, there’s something strange. There’re total 27 sets of Doppler Centroid Coefficients available in Metadata, however, each group of three coefficients like 1 :arrow_right: 3, 4 :arrow_right:6, 7 :arrow_right:9 … 25 :arrow_right: 27 are the same. Are these same because of IW data mode or there’s another reason?

Doppler_Centroid_Coefficients

  1. dop_coef_list.1
    coefficient.1
    dop_coef :arrow_right: 0.8857144
    coefficient.2
    dop_coef :arrow_right: -377.4453
    coefficient.3
    dop_coef :arrow_right: 81567.66
    zero_doppler_time :arrow_right: 10-JAN-2021 21:43:51.474330
    slant_range_time :arrow_right: 5336986.576539959 [ns]

Doppler_Centroid_Coefficients

  1. dop_coef_list.2
    coefficient.1
    dop_coef :arrow_right: 0.8857144
    coefficient.2
    dop_coef :arrow_right: -377.4453
    coefficient.3
    dop_coef :arrow_right: 81567.66
    zero_doppler_time :arrow_right: 10-JAN-2021 21:43:51.474330
    slant_range_time :arrow_right: 5336986.576539959 [ns]

Doppler_Centroid_Coefficients

  1. dop_coef_list.3
    coefficient.1
    dop_coef :arrow_right: 0.8857144
    coefficient.2
    dop_coef :arrow_right: -377.4453
    coefficient.3
    dop_coef :arrow_right: 81567.66
    zero_doppler_time :arrow_right: 10-JAN-2021 21:43:51.474330
    slant_range_time :arrow_right: 5336986.576539959 [ns]
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