GBAS/SCAT-I Mode (Options R&S
EVSG-K4/-K5)
R&S
®
EVSG1000
127
User Manual 1178.6227.02 ─ 04
7.3.1
Sequence View
Access
: [Meas] > "View" > "Sequence"
The "Sequence" view is the default view in GBAS/SCAT-I mode and provides an over-
view of the GBAS/SCAT-I transmissions over time. Each frame contains 8 TDMA slots
(see also
Chapter 7.1.2, "Broadcast Timing Structure"
frames are displayed at a time, in a table with one column for each slot and one row
per frame. You can scroll through all available frames using the rotary knob or the
and
In the "Sequence" view, the data from the last 40 frames is available. The data is
stored in a so-called
ring buffer
. When the ring buffer is full, the next data set over-
writes the first data set, that is: the oldest. Thus, the most recent 40 data sets are avail-
able. The most recently received frame is referred to as T. Each previous frame is
referred to as T minus 1 (T-1), T-2 etc. Every 500
ms, a new frame is inserted, over-
writing the frame T-39, and becomes the new frame T. Thus, the display is updated
every 500
ms. To freeze the current display for evaluation, you can pause the table
on page 139). Data recording and streaming, however, con-
tinue as usual. When updating is resumed, all frames in the table are updated.
GBAS / SCAT-I Measurement Views and Results
