Specifications

User InterfaceGPS and Assisted GPS
36Operating Manual 1171.5248.12 ─ 15
Longitude
Sets the longitude of the user defined geographic location.
This field is only configurable for user defined geographic locations. If a value other than
"User Defined" is selected in the "Geographic Location" field, the "Longitude" field is read
only.
SCPI command:
for display format Degree:Minute:Second
[:SOURce<hw>]:BB:GPS:LOCation:LONGitude:DEGRees on page 78
[:SOURce<hw>]:BB:GPS:LOCation:LONGitude:MINutes on page 79
[:SOURce<hw>]:BB:GPS:LOCation:LONGitude:SEConds on page 79
[:SOURce<hw>]:BB:GPS:LOCation:LONGitude:DIRection on page 79
for display format decimal degree
[:SOURce<hw>]:BB:GPS:LOCation:LONGitude on page 78
3.1.3 Navigation Data
The "Navigation Data" menu section is where the data source for navigation information
is selected and the data indicated (in case of real navigation data).
Data Source
Selects data source for the navigation information.
Navigation data play an extremely important role, since they are essential for calculating
the positions of the four satellites, which are the minimum prerequisite for localization
purposes. It also contains the information about the currently valid space vehicle IDs.
Note: If "Localization" is selected as simulation mode, "Real Navigation Data" is pre-
selected and no other data source can be selected.
"Real Naviga-
tion Data"
"Real Navigation Data" (almanac) can be downloaded from the internet
and stored on the hard disk of the generator.
The following almanac files are supported:
●
SEM-files with data extension *.txt
●
YUMA almanac files.
The almanac file to be used is selected in the file manager which is
called with button "Select Almanac File...". The time information of the
file is indicated below the button. The simulated date and time can be
set within the time interval determined by the loaded almanac (GPS
week).
The satellite specific information (ephemeris) is also taken from the
almanac. The time of ephemeris is indicated.
All indications and entries are made in Greenwich Mean Time.
GPS Main Dialog