IMC C SERIES User Manual page 82

82 Device description
GPS information
pv.GPS.hdop
pv.GPS.height
pv.GPS.height_geoidal
pv.GPS.latitude
pv.GPS.longitude
pv.GPS.pdop
pv.GPS.quality
pv.GPS.satellites
pv.GPS.speed
pv.GPS.time.sec
pv.GPS.vdop
For internal use only:
·
pv.GPS.counter
·
pv.GPS.test
·
pv.GPS.time.rel
·
pv.GPS.time.usec
pv.GPS.latitude and pv.GPS.longitude are scaled as integer 32 with 1E-7. They must be proceeded as
integer channels, otherwise precession will be lost. If the virtual channel is created by a addition with a
channel, the result must be multiplied by 10
latitude = Channel_001*0+pv.GPS.latitude *1E-7
RS232 port settings
For imc devices to be able to use a GPS receiver, the following conditions must be met:
·
Baud rate: Possible values are 4800, 9600, 19200, 38400, 57600 or 115200
·
8 bit, 1 stop bit, no flow control
·
The following NMEA strings must be sent: GPRMC, GPGGA, GPGSA. The order of the strings
must be adhered to.
Additional strings should be deactivated. If this is not possible, all other strings must be before
the GPGSA string!
·
The receiver must deliver a 1Hz clock.
·
The rising edge of the clock must mark the second specified in the next GPRMC string.
·
All three strings should be sent as soon as possible after the 1Hz clock, so that there is sufficient
time for processing between the last string and the next 1Hz clock.
© 2018 imc Test & Measurement GmbH
Description
Dilution of precision for horizontal
Height over sea level (over geoid) in meter
Height geoid minus height ellipsoid (WGS84) in meter
Latitude and longitude in degree. (Scaled with 1E-7)
Dilution of precision for position
GPS quality indicator
0 Invalid position or position not available
1 GPS standard mode, fix valid
2 differential GPS, fix valid
...
Number of used satellites.
Speed in km/h
As of imc DEVICES Version 2.6R3 SP9, pv.GPS.time.sec records the number of seconds
since 01.01.1970 00:00 hours UTC.
For this reason, it is no longer possible to assign the value to a Float-format channel
without loss of data. This count of seconds can be transformed to absolute time under
Windows and Linux.To do this, use the function below.
MySeconds = CreateVChannelInt( Channel_001, pv.GPS.time.sec)
Dilution of precision for vertical
see e.g. www.iota-es.de/federspiel/gps_artikel.html
-7
:
(German)
Notes
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19