ASAR external calibration data

17-May-2012

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6.6.4 ASAR external calibration data

The external calibration scaling factor is determined by ESA using three calibrated transponders, and the in-flight elevation pattern estimates are obtained using natural targets with known properties, such as the rainforest. This information is captured in the External Calibration Data file.

SIZE: MPH(1247 bytes) + SPH (378 bytes) + GADS (26552 bytes).

The MPH and SPH of these files will follow the standard MPH, SPH structure of all ENVISAT-1 auxiliary data . There is one DSD in the SPH, known as the ASA_XCA_AX_GADS, and the format for this record is given below.

Note that information is provided for all 5 of the ASAR product modes, which are the Image (IM) mode , Alternating Polarisation (AP) mode , Wide Swath (WS) mode , Global Monitoring (GM) mode , and the Wave (WV) mode , and for all swaths IS1 to IS7 as well as the sub-swaths SS1 to SS5.

Table 6.40 ASAR external calibration data

Contains ASAR external calibration data

#	Description	Units	Count	Type	Size
*Data Record*
0	dsr_time Time of creation of this file	MJD	1	mjd	12 byte(s)
1	dsr_length DSR Length Length of this DSR in bytes	bytes	1	ul	4 byte(s)
2	ext_cal_im_hh External Calibration scaling factors for IM mode, SLC image, HH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
3	ext_cal_im_vv External Calibration scaling factors for IM mode, SLC image, VV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
4	ext_cal_im_pri_hh External Calibration scaling factors for IM mode, Precision Image, HH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
5	ext_cal_im_pri_vv External Calibration scaling factors for IM mode, Precision Image, VV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
6	ext_cal_im_geo_hh External Calibration scaling factors for IM mode, Geocoded Image, HH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
7	ext_cal_im_geo_vv External Calibration scaling factors for IM mode, Geocoded Image, VV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
8	ext_cal_im_med_hh External Calibration scaling factors for IM mode, Medium Resolution Image, HH polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
9	ext_cal_im_med_vv External Calibration scaling factors for IM mode, Medium Resolution Image, VV polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
10	ext_cal_ap_hh External Calibration scaling factors for AP mode, SLC image, HH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
11	ext_cal_ap_vv External Calibration scaling factors for AP mode, SLC image, VV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
12	ext_cal_ap_hv External Calibration scaling factors for AP mode, SLC image, HV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
13	ext_cal_ap_vh External Calibration scaling factors for AP mode, SLC image, VH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
14	ext_cal_ap_pri_hh External Calibration scaling factors for AP mode, Precision Image, HH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
15	ext_cal_ap_pri_vv External Calibration scaling factors for AP mode, Precision Image, VV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
16	ext_cal_ap_pri_hv External Calibration scaling factors for AP mode, Precision Image, HV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
17	ext_cal_ap_pri_vh External Calibration scaling factors for AP mode, Precision Image, VH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
18	ext_cal_ap_geo_hh External Calibration scaling factors for AP mode, Geocoded Image, HH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
19	ext_cal_ap_geo_vv External Calibration scaling factors for AP mode, Geocoded Image, VV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
20	ext_cal_ap_geo_hv External Calibration scaling factors for AP mode, Geocoded Image, HV polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
21	ext_cal_ap_geo_vh External Calibration scaling factors for AP mode, Geocoded Image, VH polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
22	ext_cal_ap_med_hh External Calibration scaling factors for AP mode, Medium Resolution Image, HH polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
23	ext_cal_ap_med_vv External Calibration scaling factors for AP mode, Medium Resolution Image, VV polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
24	ext_cal_ap_med_hv External Calibration scaling factors for AP mode, Medium Resolution Image, HV polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
25	ext_cal_ap_med_vh External Calibration scaling factors for AP mode, Medium Resolution Image, VH polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
26	ext_cal_wv_hh External Calibration scaling factors for WV mode, HH polarisation (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
27	ext_cal_wv_vv External Calibration scaling factors for WV mode, VV polar. (7 values from swath IS1 to IS7)	-	7	fl	7*4 byte(s)
28	ext_cal_ws_hh External Calibration scaling factors for WS mode, detected image 111HH polar.	-	1	fl	4 byte(s)
29	ext_cal_ws_vv External Calibration scaling factors for WS mode, detected image ,VV polar.	-	1	fl	4 byte(s)
30	ext_cal_gm_hh External Calibration scaling factors for GM mode, HH polar.	-	1	fl	4 byte(s)
31	ext_cal_gm_vv External Calibration scaling factors for GM mode, VV polar.	-	1	fl	4 byte(s)
32	elev_ang_is1 Reference elevation angle for IS1	deg.	1	fl	4 byte(s)
33	elev_ang_is2 Reference elevation angle for IS2	deg.	1	fl	4 byte(s)
34	elev_ang_is3_ss2 Reference elevation angle for IS3 / SS2	deg.	1	fl	4 byte(s)
35	elev_ang_is4_ss3 Reference elevation angle for IS4 / SS3	deg.	1	fl	4 byte(s)
36	elev_ang_is5_ss4 Reference elevation angle for IS5 / SS4	deg.	1	fl	4 byte(s)
37	elev_ang_is6_ss5 Reference elevation angle for IS6 / SS5	deg.	1	fl	4 byte(s)
38	elev_ang_is7 Reference elevation angle for IS7	deg.	1	fl	4 byte(s)
39	elev_ang_ss1 Reference elevation angle for SS1	deg.	1	fl	4 byte(s)
40	pattern_is1 Two-way Antenna Elevation Pattern Gain Table for IS1. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
41	pattern_is2 Two-way Antenna Elevation Pattern Gain Table for IS2. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
42	pattern_is3_ss2 Two-way Antenna Elevation Pattern Gain Table for IS3/SS2. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
43	pattern_is4_ss3 Two-way Antenna Elevation Pattern Gain Table for IS4/SS3. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
44	pattern_is5_ss4 Two-way Antenna Elevation Pattern Gain Table for IS5/SS4. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
45	pattern_is6_ss5 Two-way Antenna Elevation Pattern Gain Table for IS6/SS5. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
46	pattern_is7 Two-way Antenna Elevation Pattern Gain Table for IS7. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
47	pattern_ss1 Two-way Antenna Elevation Pattern Gain Table for SS1. Four tables, 1 for each HH, VV, HV, VH polarisation. The pattern is defined from reference elevation angle - 5 deg. to reference elevation angle + 5 deg. in 0.05 degree steps.	dB	4*201	fl	42014 byte(s)
48	ext_cal_ws_slc_hh External Calibration scaling factors for WS mode, SLC Image HH polar.	-	1	fl	4 byte(s)
49	ext_cal_ws_slc_vv External Calibration scaling factors for WS mode, SLC Image VV polar	-	1	fl	4 byte(s)
50	spare_1 Spare	-	1	SpareField	24 byte(s)

Record Length : 26552

DS_NAME : Contains ASAR external calibration data

Format Version 114.0

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Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry