Rohde & Schwarz VOR/ILS Analyzer EVS200, Руководство пользователя

Страница: 48 / 68

VOR/ILS Analyzer EVS200
0796.1800.02 E-8 39
Chapter 3: Operation
Command FA1
command function
FA1 <Fast DDM measuring on> Activating the Fast DDM measurement
The command FA1 switches on the fast DDM measurement. The measuring, used only for landing
path measurement can only be activated through a controller. The output is performed as DDM value
with RF level (see example) and can be processed accordingly with calculation programs e.g. like
Excel etc. A capacaty of 34 measurements /s at a baud rate set to 19200 baud will be reached. This
conforms to a time interval of 30 ms. The measurement values (DDM, RF level) can be read in and
output as a text file corresponding to the terminal program.
To reach 34 meas/s the baud rate must be set to 19200 baud in the Setup of the
VOR/ILS Analyzer EVS200. It must be attended the acceptance of the data transfering
rate by the terminal program.
The measurement can be stopped through the command FA0 (refer to Command
FA0).
Example:
command from the controller response of the VOR/ILS Analyzer EVS200
input: FA1 <CR>
fa1 <CR>
With the command FA1 the echo
mode is automatically switched
OFF.
0.2008 -48.2 <CR/LF>
0.2008 -48.2 <CR/LF>
Both values are separated through a tabulator
ASCII 9.
1/90Hz = 11.1msec.
DSP-Analysis
DATA- DDM, RF-Level
Calculation
RS232-
Transfer
TXD-Signal
fromEVS200
30 msec.
N N+1 N+2 N+3 N+4 N+5 N+6 N+7 N+8 N+9 N+10
N
Transfer
DATA- DDM, RF-Level
Calculation
RS232-
Transfer Transfer
DATA- DDM, RF-Level
Calculation
RS232-
Transfer Transfer
DATA-
Transfer
N+2 N+5