394 Chapter 14
Real Time TDMA Formats
Enhanced Observed Time Difference (E-OTD)
E-OTD Measurement System Synchronization
To allow an Enhanced Observed Time Difference (E-OTD) measurement to be made it is important that all
the instruments in the system are synchronized. To do this a PSA is used to measure the time from the trigger
pulse to TO - where TO is defined as the middle of the training sequence. The ESG will always produce RF
quicker than the PSA due to a built in delay for the ESG.
Below is an equipment diagram and SCPI command procedure to measure the trigger to TO (TO = middle of
the midamble of a burst) measurement. Some of the SCPI commands used in this procedure to set up the
instruments and make the measurements do not have a front panel equivalent key press. The features are
only available using the remote GPIB interface.
Figure 14-4
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