WERA HF Radar Software - Modify Normal Measurements

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WERA HF Radar Software - Modify Normal Measurements (.SORT)

Modify_WERA_SORT

Modify_WERA_SORT reads all information needed on number of channels, length of timeseries, etc. from the header (first 512 bytes of data file). The program generates the file name of the associated .RFI file from the .SORT file name. If the .RFI file exists, it modifies the .RFI data accordingly. Modify_WERA_SORT can modify .SORT/.RFI data in the following four ways:

Option [R]: Reduce the range resolution by averaging the signals of 2, 3, or more range cells to shrink the file size, e.g. a factor of 2 will average two range cells of 1.2 km to give one range cell of 2.4 km depth.
Option [S]: Resample the timseries to lower sample rates, e.g. from 2048 samples at 0.26 seconds to 1536 samples at 0.3466667 seconds. The length of the resampled timseries must be a multible of 128, i.e. samples = n*128 . The reduced sample rate is derived from the position of the Bragg lines in the spectrum to keep the reqired minimum width of the spectrum.
Option [P]: Remove wrong phase calibration data applied by the real-time software during the measurement, which used /home/wera/vxworks/calibration.wera:
Calibration to be removed in: /home/wera/etc/calibration.wera.remove
Calibration to be applied in: /home/wera/etc/calibration.wera.apply
Note that the format of these files is the same as of calibration.wera, however the first two columns (amplitude calibration) are ignored.
Option [C]: Automatically correct for chirp start variations.

The following box shows a typical output generated by Modify_WERA_SORT:

~/Fortran > modify_wera_sort /home/wera/data/kaena/20023451602_kna.SORT /home/wera/data/kaena/20023451602_kna.SORT1 Modify_WERA_SORT V1.1.0 Linux: *** Now processing /home/wera/data/kaena/20023451602_kna.SORT *** Correcting Kaena TRUE_NORTH to 299 degrees. NFFT = 1024 Samples Last RC = 64 RANGEresol = 1.2000 km RAN_OFF = 0.50 RC TRUE_NORTH = 299 degrees W16mod: 1024 SAMPLES 11-DEC-02 16:02 UTC Kaena FMSOCO FREQUENZ 27.65 - Interpolate to reduced range resolution ....... [R] - Interpolate to reduced sample rates ........... [S] - Correct Chirp Start problem ................... [C] - Apply phase corrections to the antenna channels [P] -> p Antenna remove apply correction 1 0.000000 0.000000 0.000000 2 20.000000 3.565029 16.434971 3 20.000000 8.443684 11.556316 4 20.000000 7.285950 12.714050 *** Reading...... *** Result in /home/wera/data/kaena/20023451602_kna.SORT1 wera@ifmpc143:~/Fortran > modify_wera_sort ~/data/examples/20022972350_kna.sort ~/data/examples/20022972350_kna.sort1 Modify_WERA_SORT V1.1.0 Linux: *** Now processing /home/wera/data/examples/20022972350_kna.sort *** Correcting Kaena TRUE_NORTH to 299 degrees. NFFT = 2048 Samples Delta_T = 0.260000 sec Last RC = 128 RANGEresol = 1.2000 km RAN_OFF = 0.50 RC TRUE_NORTH = 299 degrees W16mod: 2048 SAMPLES 24-OCT-02 23:50 UTC Kaena FMSOCO FREQUENZ 16.05 - Interpolate to reduced range resolution ....... [R] - Interpolate to reduced sample rates ........... [S] - Correct Chirp Start problem ................... [C] - Apply phase corrections to the antenna channels [P] -> s Modified Header: NFFT = 1536 Samples Delta_T = 0.346667 sec Last RC = 128 RANGEresol = 1.2000 km RAN_OFF = 0.50 RC TRUE_NORTH = 299 degrees *** Reading...... *** Result in /home/wera/data/examples/20022972350_kna.sort1 wera@privwera8:~/Fortran> modify_wera_sort ~/dataX/surlitop/gar/20052811636_gar.SORT ~/dataX/surlitop/gar/20052811636_gar.SORT1 Modify_WERA_SORT V1.1.0 Linux: *** Also modifying /home/wera/dataX/surlitop/gar/20052811636_gar.RFI *** *** Now processing /home/wera/dataX/surlitop/gar/20052811636_gar.SORT NFFT = 2048 Samples Delta_T = 0.260000 sec Last RC = 114 RANGEresol = 1.5000 km RAN_OFF = 0.50 RC TRUE_NORTH = 340 degrees W16mod: 2048 SAMPLES 08-OCT-05 16:36 UTC Garchine FMSOCO FREQUENZ 12.470 - Interpolate to reduced range resolution ....... [R] - Interpolate to reduced sample rates ........... [S] - Correct Chirp Start problem ................... [C] - Apply phase corrections to the antenna channels [P] -> c *** Applying correction of ChirpStart: F_ERR = 0.002117810 Hz *** *** Result in /home/wera/dataX/surlitop/gar/20052811636_gar.SORT1 *** Now processing /home/wera/dataX/surlitop/gar/20052811636_gar.RFI *** Applying correction of ChirpStart: F_ERR = 0.002117810 Hz *** *** Result in /home/wera/dataX/surlitop/gar/20052811636_gar.RFI1

The following box shows an example of /home/wera/etc/calibration.wera.remove:

~/etc > cat calibration.wera.remove 1.0060586 1.0054578 0.00000000 1.0050686 1.0078536 20.00000000 1.0328177 1.0128292 20.00000000 1.0095403 1.0134968 20.00000000

The following box shows an example of /home/wera/etc/calibration.wera.apply:

~/etc > cat calibration.wera.apply 1.0060586 1.0054578 0.00000000 1.0050686 1.0078536 3.56502914 1.0328177 1.0128292 8.44368363 1.0095403 1.0134968 7.28594971

Compile and link:

Linux: Source is in Modify_WERA_SORT.F Compilation and linking with '. do_modify_wera_sort.sh' Call with > Modify_WERA_SORT input.SORT output.SORT1 e.g.: > Modify_WERA_SORT /home/wera/data/kaena/20023451602_kna.SORT /home/wera/data/kaena/20023451602_kna.SORT1

VMS: Source is in Modify_WERA_SORT.F Compilation and linking with '@Modify_WERA_SORT' Program needs to be defined as an external command to take parameters from the command line, e.g. $ Modify_WERA_SORT :== $$USER1:[WERA.Fortran]Modify_WERA_SORT.exe Call with $ Modify_WERA_SORT input.SORT output.SORT1 e.g.: $ Modify_WERA_SORT $DATA1:[GURGEL.HAWAII.Data]20023451602_kna.SORT $DATA1:[GURGEL.HAWAII.Data]20023451602_kna.SORT1

Comments to: gurgel@ifm.uni-hamburg.de (Klaus-Werner Gurgel)