3. LEADER FILE FORMAT DEFINITION
TABLE 3.1 SARLEADER FILE - FILE DESCRIPTOR RECORD (FIXED SEGMENT)
FIELD BYTES FORMAT DESCRIPTION AND/OR CONTENT CONTENT
1 1-4 B4 Record sequence number (1)
2 5 B1 1-st record sub-type code (63)
3 6 B1 Record type code (192)
4 7 B1 2-nd record sub-type code (18)
5 8 B1 3-rd record sub-type code (18)
6 9-12 B4 Length of this record (720)
7 13-14 A2 ASCII/EBCDIC flag A$
8 15-16 A2 blanks $$
9 17-28 A12 Format control document ID for this data file CEOS-SAR-CCT
format
10 29-30 A2 Format control document revision level $B
11 31-32 A2 File design descriptor revision letter $B
12 33-44 A12 Generating software release and revision level <......>
13 45-48 I4 File number $$$1
14 49-64 A16 File name ERS1.SAR.PRILEAD
15 65-68 A4 Record sequence and location type flag FSEQ
16 69-76 I8 Sequence number location $$$$$$$1
17 77-80 I4 Sequence number field length $$$4
18 81-84 A4 Record code and location type flag FTYP
19 85-92 I8 Record code location $$$$$$$5
20 93-96 I4 Record code field length $$$4
21 97-100 A4 Record length and location type flag FLGT
22 101-108 I8 Record length location $$$$$$$9
23 109-112 I4 Record length field length $$$4
24 113 A1 Reserved <$....$>
25 114 A1 Reserved <$....$>
26 115 A1 Reserved <$....$>
27 116 A1 Reserved <$....$>
28 117-180 A64 Reserved segment <$....$>
TABLE 3.2 SARLEADER FILE - FILE DESCRIPTOR RECORD VARIABLE SEGMENT
FIELD BYTES FORMAT DESCRIPTION CONTENT
29 181-186 I6 Number of data set summary records $$$$$1
30 187-192 I6 Data set summary record length $$1886
31 193-198 I6 Number of map projection data records $$$$$1
32 199-204 I6 Map projection record length $$1620
33 205-210 I6 Number of platform pos. data records $$$$$1
34 211-216 I6 Platform position record length $$1046
35 217-222 I6 Number of attitude data records $$$$$0
36 223-228 I6 Attitude data record length $$$$$0
37 229-234 I6 Number of radiometric data records $$$$$0
38 235-240 I6 Radiometric record length $$$$$0
39 241-246 I6 Number of rad. compensation records <......>
40 247-252 I6 Radiometric compensation rec. length <......>
41 253-258 I6 Number of data quality summary records $$$$$0
42 259-264 I6 Data quality summary record length $$$$$0
43 265-270 I6 Number of data histograms records $$$$$0
44 271-276 I6 Data histogram record length $$$$$0
45 277-282 I6 Number of range spectra records $$$$$0
46 283-288 I6 Range spectra record length $$$$$0
47 289-294 I6 Number of DEM descriptor records $$$$$0
48 295-300 I6 DEM descriptor record length $$$$$0
49 301-306 I6 Number of Radar par. update records <......>
50 307-312 I6 Radar par. update record length <......>
51 313-318 I6 Number of Annotation data records $$$$$0
52 319-324 I6 Annotation data record length $$$$$0
53 325-330 I6 Number of Det.processing records $$$$$0
54 331-336 I6 Det.processing record length $$$$$0
55 337-342 I6 Number of Calibration records $$$$$0
56 343-348 I6 Calibration record length $$$$$0
57 349-354 I6 Number of GCP records $$$$$0
58 355-360 I6 GCP record length $$$$$0
59 361-366 I6 spare <$....$>
60 367-372 I6 spare <$....$>
61 373-378 I6 spare <$....$>
62 379-384 I6 spare <$....$>
63 385-390 I6 spare <$....$>
64 391-396 I6 spare <$....$>
65 397-402 I6 spare <$....$>
66 403-408 I6 spare <$....$>
67 409-414 I6 spare <$....$>
68 415-420 I6 spare <$....$>
69 421-426 I6 Number of Facility data records <......>
(max 2)
70 427-432 I6 Facility data record maximum length <......>
(max 12288)
71 433-720 A288 blanks <$....$>
TABLE 3.3 DATA SET SUMMARY RECORD
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Record Sequence Number (2)
2 5 B1 1-st record sub-type code (10)
3 6 B1 Record type code (10)
4 7 B1 2-nd record sub-type code (31)
5 8 B1 3-rd record sub-type code (20)
6 9-12 B4 Length of this record (1886)
7 13-16 I4 Data set Summary Record sequence number (starts at 1)
8 17-20 I4 SAR channel indicator (1)
SCENE PARAMETERS
9 21-36 A16 reserved <$....$>
10 37-68 A32 Scene reference number (ORBIT=....-FRAME=....) <......>
11 69-100 A32 Input scene centre time (UTC) <......>
<YYYYMMDDhhmmssttt$$$$$$$$$$$$$>
where : YYYY = year ; MM = month ; DD =day;
hh = hours ; mm = minutes ; ss = seconds ;
ttt = milliseconds
12 101-116 A16 spare <$....$>
13 117-132 F16.7 Processed scene centre geodetic latitude defined as <......>
positive to the north of the equator and negative to
the south (deg)
14 133-148 F16.7 Processed scene centre geodetic longitude defined as <......>
positive to the east of the prime meridian and negative
to the west. (deg.)
15 149-164 F16.7 Processed scene centre true heading as calculated <......>
relative to North (deg)
16 165-180 A16 Ellipsoid designator <......>
17 181-196 F16.7 Ellipsoid semimajor axis (km) - (R) <......>
18 197-212 F16.7 Ellipsoid semiminor axis (km) <......>
19 213-228 F16.7 Earth"s mass times Gravitational constant - (M*G) <......>
20 229-244 A16 spare <$....$>
21 245-260 F16.7 Ellipsoid J2 parameter <......>
22 261-276 F16.7 Ellipsoid J3 parameter <......>
23 277-292 F16.7 Ellipsoid J4 parameter <......>
24 293-308 A16 spare <$....$>
25 309-324 F16.7 reserved <$....$>
26 325-332 I8 Scene centre line number (the line number <......>
at the scene centre including zero fill)
27 333-340 I8 Scene centre pixel number (the pixel number <......>
at the scene centre including zero fill)
28 341-356 F16.7 Processed scene length including zero fill <......>
29 357-372 F16.7 Processed scene width (km) including zero fill <......>
30 373-388 A16 spare <$....$>
31 389-392 I4 Number of SAR channels $$$1
32 393-396 A4 spare <$....$>
33 397-412 A16 Sensor platform mission identifier ERS1$..$
34 413-444 A32 Sensor ID: and mode of operation for this channel <......>
<AAAAAA-BB-CC-DD-EF> where:
AAAAAA = sensor identifier; BB = SAR band;
CC = resolution mode code; DD = imaging mode code;
E = transmit polarization; F = receiver polarization
35 445-452 A8 Orbit number <......>
36 453-460 F8.3 Sensor Platform geodetic Latitude at nadir (positive <......>
to north) corresponding to Scene Center (deg)
37 461-468 F8.3 Sensor Platform geodetic Longitude at nadir (positive <......>
to east) corresponding to Scene Center (deg)
38 469-476 F8.3 Sensor Platform Heading at nadir corresponding <......>
to Scene Center(deg)
39 477-484 F8.3 Sensor clock angle as measured relative to sensor <......>
platform flight direction
40 485-492 F8.3 Incidence angle at scene centre as derived from sesor <......>
platform orientation
41 493-500 F8.3 Radar frequency (GHz) <......>
42 501-516 F16.7 Radar wavelength (meters) <......>
43 517-518 A2 Motion compensation indicator <......>
"00" = no compensation, "01" = on board compensation
"10" = in processor compensation,
"11" = both on board and in processor
44 519-534 A16 Range pulse code specifier <......>
45 535-550 E16.7 Range pulse (chirp) amplitude coefficient <......>
constant term (offset from DC) (Hz)) nominal value
46 551-566 E16.7 Range pulse (chirp)amplitude coefficient <......>
linear term ( sec-1))nominal value
47 567-582 E16.7 Range pulse (chirp) amplitude coefficient <......>
quadratic term ( sec-2) nominal value
48 583-598 E16.7 Range pulse (chirp) amplitude coefficient <......>
cubic term ( sec-3) nominal value
49 599-614 E16.7 Range pulse (chirp)amplitude coefficient <......>
quartic term ( sec-4) nominal value
50 615-630 E16.7 Range pulse (chirp) phase coefficient <......>
constant term (offset in cycles)
51 631-646 E16.7 Range pulse (chirp) phase coefficient <......>
linear term (Hz) nominal value
52 647-662 E16.7 Range pulse (chirp) phase coefficient <......>
quadratic term (Hz/sec) nominal value
53 663-678 E16.7 Range pulse (chirp) phase coefficient <......>
cubic term (Hz/sec-2) nominal value
54 679-694 E16.7 Range pulse (chirp) phase coefficient <......>
quartic term (Hz/sec-3) nominal value
55 695-702 I8 Down linked data chirp extraction index (in samples) <......>
56 703-710 A8 spare <$$..$$>
57 711-726 F16.7 Sampling rate (MHz) <......>
58 727-742 F16.7 Range gate delay at early edge (in time) <......>
at the start of the image (micro-sec)
59 743-758 F16.7 Range pulse length (micro-sec) <......>
60 759-762 A4 reserved <$....$>
61 763-766 A4 Range compressed flag (yes = range compressed data) <$....$>
62 767-782 F16.7 reserved <$....$>
63 782-798 F16.7 reserved <$....$>
64 799-806 I8 Quantization in bits per channel (5I 5Q/6I 6Q <......>
for OGRC/OBRC)
65 807-818 A12 Quantizer descriptor (eg:"UNIFORM$I,Q$") <......>
66 819-834 F16.7 DC Bias for I-component <......>
67 835-850 F16.7 DC Bias for Q-component <......>
68 851-866 F16.7 Gain imbalance for I & Q <......>
69-70 867-898 A32 spare <$....$>
71 899-914 F16.7 reserved <$....$>
72 915-930 F16.7 Antenna mechanical boresight relative to platform <......>
vertical axis at the start of the image positive to
the right negative to the left.(deg)
73 931-934 A4 reserved <$....$>
74 935-950 F16.7 Nominal PRF (Hz) <......>
75 951-966 F16.7 reserved <$....$>
76 967-982 F16.7 reserved <$....$>
SENSOR SPECIFIC PARAMETERS
77 983-998 I16 Satellite encoded binary time code <......>
78 999-1030 A32 Satellite clock time <YYYYMMDDhhmmssttt$$$...$> <......>
79 1031-1038 I8 Satellite clock increment (nano-secs)) <......>
80 1039-1046 A8 spare <$....$>
81 1047-1062 A16 Processing facility identifier <......>
82 1063-1070 A8 Processing system identifier <......>
83 1071-1078 A8 Processing version identifier <......>
84 1079-1094 A16 reserved <$....$>
85 1095-1110 A16 reserved <$....$>
86 1111-1142 A32 Product type specifier <......>
87 1143-1174 A32 Processing algorithm identifier (e.g. Range-Doppler) <......>
88 1175-1190 F16.7 Nominal number of looks processed in Azimuth <......>
89 1191-1206 F16.7 Nominal effective number of looks processed in Range <......>
90 1207-1222 F16.7 Bandwidth per look in Azimuth ( Hz ) <......>
91 1223-1238 F16.7 Bandwidth per look in Range ( MHz ) <......>
92 1239-1254 F16.7 Total processor bandwidth in Azimuth (Hz) <......>
93 1255-1270 F16.7 Total processor bandwidth in Range (MHz) <......>
94 1271-1302 A32 Weighing function designator in Azimuth <......>
95 1303-1334 A32 Weighing function designator in Range <......>
96 1335-1350 A16 Data input source (eg:HDDT identifier) <......>
97 1351-1366 F16.7 Nominal resolution equal to 3dB points in <......>
ground range (meter)
98 1367-1382 F16.7 Nominal resolution in Azimuth (meter) <......>
99-100 1383-1414 A32 reserved <$....$>
101 1415-1430 F16.7 Along track Doppler frequency constant term at <......>
early edge of image (Hz)
102 1431-1446 F16.7 Along track Doppler frequency linear term at <......>
early edge of the image (Hz/sec)
103 1447-1462 F16.7 Along track Doppler frequency quadratic term at <......>
early edge of the image (Hz/sec/sec)
104 1463-1478 A16 spare <$....$>
105 1479-1494 F16.7 Cross track Doppler frequency constant term at <......>
early edge of the image (Hz)
106 1495-1510 F16.7 Cross track Doppler frequency linear term at <......>
early edge of the image (Hz/sec)
107 1511-1526 F16.7 Cross track Doppler frequency quadratic term at <......>
early edge of the image (Hz/pixeI/sec)
108 1527-1534 A8 Time direction indicator along pixel direction <......>
(ie:"INCREASE"-ing or "DECREASE"-ing")
109 1535-1542 A8 Time direction indicator along line direction <......>
(ie:"INCREASE"-ing or "DECREASE"-ing")
110 1543-1558 F16.7 Along track Doppler frequency rate constant <......>
term at early edge of the image (Hz/sec)
111 1559-1574 F16.7 Along track Doppler frequency rate linear <......>
term at early edge of the image (Hz/sec/sec)
112 1575-1590 F16.7 Along track Doppler frequency rate quadratic <......>
term at early edge of the image (Hz/sec/sec/sec)
113 1591-1606 A16 spare <$....$>
114 1607-1622 F16.7 Cross track Doppler frequency rate constant term <......>
at near edge of the image (Hz/sec)
115 1623-1638 F16.7 Cross track Doppler frequency rate linear term <......>
relative to near edge of the image (Hz/sec/sec)
116 1639-1654 F16.4 Cross track Doppler frequency rate quadratic term <......>
relative to near edge of the image
(Hz/sec/sec/sec)
117 1655-1670 A16 spare <$....$>
118 1671-1678 A8 Line content indicator <......>
119 1679-1682 A4 Clutter lock applied flag <......>
120 1683-1686 A4 Autofocussing applied flag <......>
121 1687-1702 F16.7 Line spacing (meters) <......>
122 1703-1718 F16.7 Pixel spacing ( in range )(meters) <......>
123 1719-1734 A16 Processor range compression designator <......>
124-125 1735-1766 2A16 spare <$....$>
SENSOR SPECIFIC LOCAL USE SEGMENT
126 1767-1814 3F16.7 Zero-doppler range time of first range pixel (msec) <......>
Zero-doppler range time of centre range pixel(msec) <......>
Zero-doppler range time of last range pixel (msec) <......>
1815-1886 3A24 Zero-doppler azimuth time of first azimuth pixel (UTC)<......>
Zero-doppler azimuth time of centre azimuth pixel(UTC)<......>
Zero-doppler azimuth time of last azimuth pixel (UTC)<......>
as : dd-MMM-YYYY hh:mm:ss.ttt where
dd = day
MMM = month (e.g. JAN)
YYYY = year
hh = hour
mm = minuts
ss = seconds
ttt = milliseconds
TABLE 3.4 MAP PROJECTION DATA RECORD
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Record sequence number (3)
2 5 Bl 1-st record sub-type code (10)
3 6 Bl Record type code (20)
4 7 Bl 2-nd record sub-type code (31)
5 8 Bl 3-rd record sub-type code (20)
6 9-12 B4 Length of this record (1620)
7 13-28 A16 spare <$....$>
MAP PROJECTION GENERAL INFORMATION
8 29-60 A32 Map projection descriptor (eg: slant range,etc.) <......>
9 61-76 I16 Number of pixels per line of image <......>
10 77-92 I16 Number of lines <......>
11 93-108 F16.7 Nominal inter-pixel distance in output scene (m) <......>
12 109-124 F16.7 Nominal inter-line distance in output scene (m) <......>
13 125-140 F16.7 Orientation at output scene centre <......>
for geocoded products this is simply the
convergence of the meridians, ie: the
angle between geographic north and map
grid north (degrees) (Angle of projection
axis from true North)
14 141-156 F16.7 Actual platform orbital inclination (deg) <......>
15 157-172 F16.7 Actual ascending node (longitude at equator) (deg) <......>
16-18 173-220 3F16.7 reserved <$....$>
19 221-236 F16.7 platform heading at centre
20 237-268 A32 Name of reference ellipsoid
21 269-284 F16.7 Semimajor axis of ref.ellipsoid (m) <......>
22 285-300 F16.7 Semiminor axis of ref.ellipsoid (m) <......>
23-55 301-880 A580 reserved <$....$>
56-59 881-944 4A16 spares <$....$>
COORDINATES OF FOUR CORNER POINTS
60-67 945-1072 A128 reserved <$....$>
68 1073-1088 F16.7 first line first pixel geodetic latitude positive <......>
for north latitude (deg)
69 1089-1104 F16.7 first line first pixel longitude positive for <......>
east longitude (deg)
70 1105-1120 F16.7 first line last pixel geodetic latitude (deg) <......>
71 1121-1136 F16.7 first line last pixel longitude (deg) <......>
72 1137-1152 F16.7 last line last pixel geodetic latitude (deg) <......>
73 1153-1168 F16.7 last line last pixel longitude (deg) <......>
74 1169-1184 F16.7 last line firstpixel geodetic latitude (deg) <......>
75 1185-1200 F16.7 last line firstpixel longitude (deg) <......>
76 1201-1620 A420 reserved (blank) <$....$>
TABLE 3.5 PLATFORM POSITION DATA RECORD
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Record sequence number (4)
2 5 Bl 1-st record sub-type code (10)
3 6 Bl Record type code (30)
4 7 Bl 2-nd record sub-type code (31
5 8 Bl 3-rd record sub-type code (20)
6 9-12 B4 Length of this record <......>
7 13-44 A32 reserved <$....$>
8-13 45-140 6F16.7 reserved <$....$>
14 141-144 I4 Number of data points (up to 64) <......>
15 145-148 I4 Year of data point. (YYYY) <....>
16 149-152 I4 Month of data point. ($$MM) <$$..>
17 153-156 I4 Day of data point. ($$DD) <$$..>
18 157-160 I4 Day in the year (GMT) (1st January = day 1)
19 161-182 D22.15 Seconds of day (GMT) of data <......>
20 183-204 D22.15 Time interval between DATA points (sec) <......>
21 205-268 A64 Reference coordinate system <......>
22 269-290 D22.15 Greenwich mean hour angle (degrees) <......>
23 291-306 F16.7 Along track position error (meters) <......>
24 307-322 F16.7 Across track position error (meters) <......>
25 323-338 F16.7 Radial position error (meters) <......>
26-28 339-386 3F16.7 reserved <$....$>
FIRST POSITIONAL DATA POINT
29 387-452 3D22.15 l-st data point position vector as <......>
latitude, longitude and altitude for
airborne sensor platform, and as (X,Y,Z)
coordinates for spaceborne sensor platform
in a reference system such as CTS (meters)
30 453-518 3D22.15 lst data point velocity vector in airborne <......>
coordinates (meters/second & degrees/second)
for airborne sensor platform or (X',Y',Z') in
a reference system such as CTS for spaceborne
sensor platforms
31-....519-... 6D22.15 2nd, 3rd, ... data point position & <......>
velocity vectors (repetition of fields
29-30 as specified by the number of
points in field #14)
<tbd> <tbd>-EOR A<tbd> blanks <$....$>
TABLE 3.6 RADIOMETRIC COMPENSATION DATA RECORD
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Sequence number (n)
2 5 Bl 1-st record sub-type code (10)
3 6 Bl Record type code (51)
4 7 Bl 2-nd record sub-type code (31)
5 8 Bl 3-rd record sub-type code (20)
6 9-12 B4 Length of this record <......>
7 13-16 I4 Rad. compensation record Sequence number <......>
8 17-20 I4 SAR channel indicator <......>
9 21-28 I8 Number of radiometric compensation data <......>
sets in the record
10 29-36 I8 Compensation data set size (bytes) <......>
11 37-44 A8 Compensation data type designator <......>
(eg: "RANGE" "AZIMUTH' "PIXEL","LINE"
12 45-76 A32 Compensation data descriptor (eg: <......>
" elevation antenna pattern", "range
attenuation", "resolution cell size",
"azimuth attenuation", etc.)
13 77-80 I4 Number of compensation records <......>
14 81-84 I4 Sequence number in the full compensation <......>
table of the table contained in this record
15 85-92 I8 Total number of compensation pairs in <......>
the full compensation table
16 93-100 I8 Data pixel number corresponding to first <......>
correction value in compensation table
17 101-108 I8 Data pixel number corresponding to last <......>
correction value in compensation table
18 109-116 I8 Compensation pixel group size (pixels) <......>
19 117-132 F16.7 Min. table Offset value (dB) <......>
20 133-148 F16.7 Min. table Gain value (dB) <......>
21 149-164 F16.7 Max. table Offset value (dB) <......>
22 165-180 F16.7 Max. table Gain value (dB) <......>
23 181-196 A16 spare <$....$>
RADIOMETRIC COMPENSATION TABLE VALUES
24 197-204 I8 Number of compensation table entries (up <......>
to 256 samples/record in example)
25 205-220 F16.7 1-st compensation sample Offset (dB) <......>
26 221-236 F16.7 1-st compensation sample Gain (dB) <......>
27 237-252 F16.7 2-nd compensation sample Offset (dB) <......>
28 253-268 F16.7 2-nd compensation sample Gain (dB) <......>
. . . .
535 8365-8380F16.7 256-th compensation sample Offset (dB) <......>
536 8381-8396F16.7 256-th compensation sample Gain (dB) <......>
537 8397-8600A204 blanks <$....$>
TABLE 3.7 RADAR PARAMETER UPDATE DATA RECORD
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Record sequence number (n)
2 5 Bl 1-st record sub-type code (10)
3 6 Bl Record type code (100)
4 7 Bl 2-nd record sub-type code (31)
5 8 Bl 3-rd record sub-type code (20)
6 9-12 B4 Length of this record = <tbd> <......>
7 13-16 I4 Radar parameter record sequence number <......>
8 17-20 A4 spare <$....$>
9 21-28 I8 Number of radar parameter update data <......>
sets in the record
10 29-36 I8 Radar parameter update data set size <......>
(bytes)
1-ST RADAR PARAMETER UPDATE DATA SET
11 37-56 A20 GMT of Change (YYYYMMDD-hhmmssttt$$) <......>
12 57-60 A4 SAR channel indicator <......>
13 61-68 I8 Radar data line number where this update <......>
takes effect
14 69-76 I8 Radar data sample number where this <......>
update takes effect
15 77-108 A32 Parameter descriptor field, one of: <......>
"RECEIVER GAIN (dB) ="
"RECORD WINDOW POSITION (Vsec) ="
"ELECTRONIC BORESIGHT (degrees) ="
"PRF (Hz) ="
"PULSE BANDWIDTH (Hz) ="
"PULSE DURATION (µsec) ="
"QUANTIZATION (bits)
etc.
16 109-124 E16.7 Parameter value <......>
2-ND,. RADAR PARAMETER UPDATE DATA SET
20 125-... ... The radar parameter update data set <......>
(fields 11-16) are repeated as many times
as indicated by the data set counter
(fie1d# 9)
<tbd> <tbd>-EORA<tbd> spares <$....$>
TABLE 3.8 FACILITY RELATED DATA RECORD GENERAL TYPE
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Sequence number (n)
2 5 Bl 1-st record sub-type code (10)
3 6 Bl Record type code (200)
4 7 Bl 2-nd record sub-type code (31)
5 8 Bl 3-rd record sub-type code (50)
6 9-12 B4 Length of this record 12288
7 13-76 A64 name of this facility related data record "FACILITY"
"$RELATED$DATA$RECORD$GENERAL$TYPE$..$"
8 77-82 A6 Date of the last release of QC software as YYMMDD, <......>
where: YY = last two digits of year
MM = month of the year
DD = day of the month
9 83-84 A2 spare <$....$>
10 85-90 A6 Date of the last calibration update as YYMMDD
(field 8 format)
SAR QA Summary Flags:
11 91-94 I4 Overall QA Summary Flag (0/1) <......>
12 95-98 I4 PRF code change Flag (0/1) <......>
13 99-102 I4 Sampling Window change Flag (0/1) <......>
14 103-106 I4 Cal system & Receiver gain change Flag (0/1) <......>
15 107-110 I4 Chirp replica quality Flag (0/1) <......>
16 111-114 I4 Input data statistic Flag (0/1) <......>
17 115-118 I4 Doppler centroid confidence measure Flag (0/1) <......>
18 119-122 I4 Doppler centroid value Flag ( 0 or 1) <......>
19 123-126 I4 Doppler ambiguity confidence measure Flag (0/1) <......>
20 127-130 I4 Output data Mean Flag <......>
SAR QA Parameters:
21 131-134 I4 OGRC/OBRC flag (0/1) <......>
22 135-138 I4 Number of PRF code changes <......>
23 139-142 I4 Number of sampling window time changes <......>
24 143-146 I4 Number of calibration subsystems gain changes <......>
25 147-150 I4 Number of missing lines <......>
26 151-154 I4 Number of receiver gain changes <......>
27 155-170 F16.7 3-dB pulse width of ( first ) Chirp (samples) <......>
Replica Autocorrelation Function (ACF) <......>
28 171-186 F16.7 first side-lobe level of Chirp ACF (dB) <......>
29 187-202 F16.7 ISLR of Chirp ACF function (dB) <......>
30 203-218 F16.7 Doppler Centroid confidence measure (processor specific) <......>
(value normalised such that it takes a value between
zero and one as worst and best case)
31 219-234 F16.7 Doppler ambiguity confidence measure (processor specific)<......>
32 235-250 F16.7 Estimated Mean of I input data
33 251-266 F16.7 Estimated Mean of Q input data <......>
34 267-282 F16.7 Estimated Standard deviation of I input data <......>
35 283-298 F16.7 Estimated Standard deviation of Q input data <......>
36 299-314 F16.7 Calibration system gain <......>
37 315-330 F16.7 First Receiver Gain Read <......>
38 331-346 F16.7 Doppler Ambiguity Number <......>
39 347-362 A16 spare
Internal Calibration
40 363-378 F16.7 bias correction applied to I channel <......>
41 379-394 F16.7 bias correction applied to Q channel <......>
42 395-410 F16.7 Gain imbalance correction applied to I channel <......>
43 411-426 F16.7 Gain imbalance correction applied to Q channel <......>
44 427-442 F16.7 I/Q Non-orthogonality correction applied to Q channel <......>
45 443-458 A16 spare <$....$>
46 459-474 F16.7 Estimated noise power <......>
47 475-490 I16 calibration pulse time delay (nanoseconds) <......>
48 491-494 I4 Number of valid calibration pulses <......>
49 495-498 I4 Number of valid noise pulses <......>
50 499-502 I4 Number of valid replica pulses <......>
51 503-518 F16.7 first sample in replica (CEI) (samples) <......>
52 519-534 F16.7 Mean Cal pulse power <......>
53 535-550 F16.7 Mean noise power <......>
54 551-566 F16.7 range compression normalisation factor <......>
55 567-582 F16.7 replica power <......>
56 583-598 F16.7 incidence angle at first range pixel <......>
(at mid-azimuth,deg)
57 599-614 F16.7 incidence angle at centre range pixel <......>
(at mid-azimuth,deg)
58 615-630 F16.7 incidence angle at last range pixel <......>
(at mid-azimuth,deg)
59 631-646 F16.7 normalisation reference range Ro ( in Km ) <......>
( set to 0 for ERS.SAR.SLC )
60 647-658 A12 spare <$....$>
61 659-662 I4 antenna elevation gain pattern flag ( 0 or 1) <......>
62 663-678 F16.7 absolute calibration constant K ( scalar ) <......>
63 679-694 F16.7 Upper bound K (+3 std dev ) <......>
64 695-710 F16.7 Lower bound K (-3 std dev ) <......>
65 711-726 F16.7 estimated noise equivalent micro-0 (dB) <......>
66 727-732 A6 Date on which K was generated as YYMMDD <......>
( see field 7 format)
67 733-736 A4 K version number as XXYY where <......>
XX refers to a K update implemented across
the ground segment
YY refers to an upgrade only at the source PAF
( as may arise in case of local software updates )
68 737-740 I4 number of duplicated input lines <......>
69 741-756 F16.7 estimated bit error rate <......>
70 757-768 A12 spare
71 769-784 F16.7 output image mean <......>
72 785-800 F16.7 output image standard deviation <......>
73 801-816 F16.7 output image maximum value <......>
74 817-840 A24 time of raw data first input range line (UTC) <......>
<dd-MMM-yyy hh:mm:ss.ttt>
75 841-864 A24 time of ascending node state vectors (UTC) <......>
(same format as field 74)
76 865-886 D22.15 ascending node position vector X component (m) <......>
77 887-908 D22.15 ascending node position vector Y component (m) <......>
78 909-930 D22.15 ascending node position vector Z component (m) <......>
79 931-952 D22.15 ascending node velocity vector Vx component (m/s) <......>
80 953-974 D22.15 ascending node velocity vector Vy component (m/s) <......>
81 975-996 D22.15 ascending node velocity vector Vz component (m/s) <......>
82 997-1000 I4 output pixel bit length (bits)
83 1001-1016 F16.7 processor gain parameter 1
84 1017-1032 F16.7 processor gain parameter 2
85 1033-1048 F16.7 processor gain parameter 3
86 1049-1052 I4 peak location of cross correlation function between <......>
first extracted chirp and nominal chirp (samples)
87 1053-1068 F16.7 3-dB width of CCF between last extracted chirp and
nominal chirp (samples)
88 1069-1084 F16.7 first side lobe level of chirp (CCF) between last <......>
extracted chirp and nominal chirp (dB)
89 1085-1100 F16.7 ISLR of CCF between last extracted chirp <......>
and nominal chirp(dB)
90 1101-1104 I4 peak location of CCF betwee last extracted chirp <......>
and nominal chirp (samples)
91 1105-1108 I4 Roll Tilt Mode flag (0 = not in roll tilt mode) <......>
92 1109-1112 I4 raw data correction flag (0 = correction with default <......>
parameters)
93 1113-1116 I4 look detection flag (1 = power detected and summed) <......>
94 1117-1120 I4 doppler ambiguity estimation flag <......>
(0 = no estimation done)
95 1121-1124 I4 azimuth baseband conversion flag <......>
(0 = no conversion done)
96 1125-1128 I4 samples per line used for the raw data analysis <......>
97 1129-1132 I4 range lines skip factor for raw data analysis <......>
98 1133-1156 A24 time of input state vectors (UTC) used to process <......>
the image (same format as field 74)
99 1157-1178 D22.15 input state vector position X component (m) <......>
100 1179-1200 D22.15 input state vector position Y component (m) <......>
101 1201-1222 D22.15 input state vector position Z component (m) <......>
102 1223-1244 D22.15 input state vector velocity VX component (m/s) <......>
103 1245-1266 D22.15 input state vector velocity VY component (m/s) <......>
104 1267-1288 D22.15 input state vector velocity VZ component (m/s) v
105 1289-1292 I4 input state vector type flag <......>
(0 = ascending node state vectors,predicted orbit;
1 = near scene state vectors,restituted orbit)
106 1293-1308 F16.7 window coefficient for range-matched filter <......>
107 1309-1324 F16.7 window coefficient for azimuth-matched filter <......>
108 1325-1328 I4 update period of range-matched filter (chirps) <......>
109 1329-1456 8F16.7 look scalar gains (up to 8 looks) <......>
110 1457-1460 I4 sampling window start time bias (nanoseconds) <......>
111 1461-1482 D22.15 doppler centroid cubic coefficient(Hz/sec3) <......>
112 1483-1486 I4 PRF code of first range line (telemetry value) <......>
113 1487-1490 I4 PRF code of last range line (telemetry value) <......>
114 1491-1494 I4 sampling window start time code of first range line <......>
(telemetry value)
115 1495-1498 I4 sampling window start time code of last range line <......>
116 1499-1502 I4 calibration system gain of last processed line <......>
(telemetry value)
117 1503-1506 I4 receiver gain of last processed line (telemetry value)<......>
118 1507-1510 I4 first processed range sample <......>
119 1511-1514 I4 azimuth FFT/IFFT ratio <......>
120 1515-1518 I4 number of azimuth blocks processed <......>
121 1519-1526 I8 number of input raw data lines <......>
122 1527-1530 I4 initial doppler ambiguity number <......>
123 1531-1578 3F16.7 chirp quality thresholds
-Pulse width of the chirp CCF (10-3 pixels) <......>
-First sidelobe of the chirp CCF (10-3 dB) <......>
-ISLR of the chirp CCF (10-3 dB) <......>
1579-1642 4F16.7 input data statistic thresholds
-mean of input I data in fraction of maximum absolute <......>
of input data (10-3)
-mean of input Q data in fraction of maximum absolute <......>
of input data (10-3)
-standard deviation of input I data in fraction of <......>
maximum absolute of input data (10-3)
-standard deviation of input Q data in fraction of <......>
maximum absolute of input data (10-3)
1643-1674 2F16.7 doppler ambiguity confidence thresholds (10-3) <......>
1675-1706 2F16.7 output data statistic thresholds
-mean of outout data (10-3) <......>
-standard deviation of output data (10-3) <......>
124 1707-1722 I16 satellite binary time of first range line <......>
(telemetry value)
125 1723-1726 I4 number of valid pixels per range line <......>
(the remaining pixels are zero padded)
126 1727-1730 I4 number of range samples discarded during <......>
processing interpolations
127 1731-1746 F16.7 I/Q gain imbalance lower bound <......>
128 1747-1762 F16.7 I/Q gain imbalance upper bound <......>
129 1763-1778 F16.7 I/Q quadrature departure lower bound (degrees) <......>
130 1779-1794 F16.7 I/Q quadrature departure upper bound (degrees) <......>
131 1795-1810 F16.7 3-dB look bandwidth (Hz) <......>
132 1811-1826 F16.7 3-dB processed doppler bandwidth (Hz) <......>
133 1827-1830 I4 range spreading loss compensation flag <......>
(0 = no compensation)
134 1831-1831 I1 datation flag (1 = azimuth timing improved based <......>
on timing information of range line specified
in field 136)
135 1832-1838 I7 maximum error of range line timing (nanoseconds) <......>
136 1839-1845 I7 format number of range line used to synchronize <......>
azimuth timing
137 1846-1846 I1 automatic look scal gain flag <......>
(1 = automatically calculated)
138 1847-1850 I4 maximum value of look scalar gain before the <......>
look scalar gains are normalised
139 1851-1854 I4 replica normalisation method flag <......>
(0 = normalised by replica power,i.e.
Z' = Z*(c/Ar) where Ar is the replica
power and c is specified in field 54;
1 = normalised by the square root of replica
power, Z' = Z /Ar )
140 1855-1934 4E20.10 4 coefficients of the ground range to slant range
conversion polynamial
141 1935-2034 5E20.10 5 coefficients of the antenna elevation
pattern polynomial
142 2035-2050 E16.7 range time of origin of antenna elevation (sec) <......>
pattern polynomial
143 2051-12288 A10238 spare
TABLE 3.9 FACILITY RELATED DATA RECORD PCS QUALITY TYPE
FIELD BYTES FORMAT DESCRIPTION CONTENT
1 1-4 B4 Sequence number (n)
2 5 Bl 1-st record sub-type code (10)
3 6 Bl Record type code (200)
4 7 Bl 2-nd record sub-type code (31)
5 8 Bl 3-rd record sub-type code (50)
6 9-12 B4 Length of this record (12288)
7 13-76 A64 name of this facility related data record "FACILITY"
"$RELATED DATA RECORD PCS QUALITY TYPE$...$"
8 77-12288 B reserved