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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
3-44 SECTION 3 - OPERATING INSTRUCTIONS
Figure 3-33: Real-time “Sounding Mode” Display of DCART (Enabled, click to Disable)
DCART Processing Chain
3:84. Detailed description of the processing steps that are applied to Digisonde-4D time domain samples can
be found in Section 1. Table 3-2 summarizes contents of the full Processing Chain in DCART. Steps 1-4 are
performed in the time domain for 4 antenna channels individually. Doppler analysis (step 5) is applied to sam-
ple sets collected across multiple repetitions of pulses at the same frequency for the same range bin. Reduction
to ionogram (step 6) is done for ionogram mode only by selecting only one Doppler line from the 4 channels of
spectra for each range bin, and calculating direction of echo arrival for selected Doppler line only. Different
types of real-time display are provided in DCART for steps 1-4, 5, and 6.
Table 3-2. DCART Processing Chain
Cross-channel Equalizing (CCEQ)
Sum of complementary codes
max Doppler/beam, for ionogram mode only
Real-time Display of Time-Domain Data (Steps 1-4 of Processing Chain)
3:85. Figure 3-34 shows real-time Time Domain display (labeled TIME DOMAIN in the background) show-
ing four channels of data with magnitude of signal in the left column and phase in the right column. The plot
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