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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
3-70 SECTION 3 - OPERATING INSTRUCTIONS
3:131. CCEQ data are acquired to derive complex correction coefficients to channels 2, 3, and 4 that would
equalize their transfer function to match channel 1. The CCEQ data are stored in text form in .CEQ files and
sent to Dispatcher for their post-management (assembly in daily files, delivery to remote destinations, etc.). A
copy of the latest CEQ operation is stored in /digisonde/dispatch folder as LATEST.CEQ to use it for equaliza-
tion step of the Processing Chain (see Chapter 1 for further details of signal processing in Digisonde-4D). Sam-
ple content of the .CEQ files is given in Table 3-12.
Table 3-12: Sample CCEQ Data File
DIGISONDE CHANNEL EQUALIZING DATA
Version: 0
Time of measurement: 2006.08.15 (227) 20:53:59
FREQ A1/A2 Ph1-Ph2 A1/A3 Ph1-Ph3 A1/A4 Ph1-Ph4
500 .9886 -.31 .9664 -1.27 .9248 1.45
550 .9673 1.17 .9351 .08 .9043 2.82
600 .9706 1.48 .9378 .47 .8974 3.31
650 .9556 1.28 .9357 -.77 .8995 1.70
700 .9612 .38 .9520 -1.23 .9107 .80
750 .9494 .09 .9315 -.58 .8959 1.13
800 .9724 -.75 .9628 -1.57 .9336 -.95
850 .9599 -.68 .9427 -.42 .9199 -.70
900 .9506 -2.03 .9252 -1.66 .9026 -2.09
950 .9522 -2.54 .9283 -2.33 .9071 -3.18
1000 .9761 -2.81 .9542 -2.80 .9332 -3.91
1050 .9803 -1.28 .9612 -.78 .9360 -2.05
3:132. CCEQ data are shown in the “Channel Equalizing” tab of DCART main display area using the standard
4-channel panel display shown in Figure 3-34 and Figure 3-35.
Calibration of Tracking Filters
3:133. Tuning of the voltage-sensitive varicaps in the tracking filters of Digisonde-4D requires a calibration
algorithm that finds the optimal control voltages for a predefine set of operating frequencies (see Figure 3-50
and Table 3-13 ).
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