Rohde & Schwarz EVSG-B1, User Manual

Page: 178 / 418

GBAS/SCAT-I Mode (Options R&S EVSG-K4/-K5)
R&S
®
EVSG1000
178 User Manual 1178.6227.02 ─ 06
For each slot in each displayed frame, the following information is provided in the cor-
responding table cell (for a valid GBAS burst, if available).
GBAS ID ......................................................................................................................178
Burst Level Average (Av [dBm]) .................................................................................. 178
Application Data (App. Dat.) ........................................................................................178
Status .......................................................................................................................... 178
GBAS ID
4-character identifier of the ground station broadcasting the message. If there is more
than one message inside the burst, the first GBAS ID is displayed.
Remote command:
GBAS:GBASID?
on page 338
Burst Level Average (Av [dBm])
Arithmetic average of the burst power level measured over the period of the synchroni-
zation and ambiguity resolution field of the burst.
If no burst was detected, the arithmetic average of the noise power is displayed.
Remote command:
LA?
on page 336
Application Data (App. Dat.)
Detected message types (MT) in the burst
Example: "MT:1,2": messages of type 1 and 2 detected
Status
The burst status is indicated by the color of the slot cell:
Green The status is "OK". The received burst passed the cyclic redundancy
check (CRC).
Red An error occurred. The received burst did not pass the cyclic redun-
dancy check (CRC).
Gray No burst received.
6.3.2 Frame View
Access : [Meas] > "View" > "Frame"
To use the available spectrum most efficiently, despite the low data rate, GBAS trans-
missions use the Time Division Mulitple Access (TDMA) method (see also
Chap-
ter 6.1.2, "Broadcast Timing Structure" , on page 173). Thus, multiple GBAS bursts,
even from different transmitters, can be sent in a single frame. To do so, the transmit-
ters must adhere to the time slots strictly. Nevertheless, time delays can occur during
GBAS / SCAT-I Measurement Views and Results