LabSat 3 Wideband features a multi constellation GNSS receiver which can be used to monitor L1 band GNSS signals in either the incoming RF signal during recording or the outgoing RF signal during replay. The USB device connector on the rear of LabSat 3 Wideband functions as a virtual serial connection and will output NMEA data from the GNSS monitor at 115,200 baud when record or replay is active.
In addition to this, pressing the 'OK' button during record or replay will switch the display to show satellite tracking levels for GPS L1, GLONASS L1, Beidou B1 and Galileo E1 satellites. Pressing the up or down arrows in this display will swap between constellations. It is important to note that when switching between constellations on the LCD display, the configuration of the GNSS monitor, and therefore the NMEA data content, will change.
The primary aim of the GNSS monitor during recording is to give indication that an L1 band GNSS antenna is connected and working. It is important to understand that the monitor is listening directly to the RF input and so the presence of valid satellites indicated by the monitor does not have any link with the user configured constellation frequencies being recorded. Therefore it is up to the user to check that these are correctly configured. If the antenna used does not support L1 GNSS signals, then the GNSS monitor will not show any satellite tracking information.
During replay, the GNSS monitor will listen into the RF output signal. If the replayed signal contains valid L1 GNSS signals then these will be reported by the monitor.
Main ‘File Display’ screen button functions
|Move up/Down through list of files or menu options.|
|Begin replay of the currently highlighted file.|
|Start recording to a new file using the current settings. File number will be incremented.|
|Press OK to select option.|
|Press for 3 seconds to power down LabSat.|
Top Level Menu Functions
- Info – Display file info for selected file.
- Protect – Write protect current file to avoid accidental deletion.
- Copy - Copy selected file to SD/USB media.
- Delete – Delete selected file, Yes/No.
- Format – Erase and Format internal SSD, Yes/No.
Allows configuration of recorded frequency bands. Within the constellation options are signal bit-depth (quantisation) and bandwidth settings. Depending on the combination of bit depth and bandwidth, the number of configurable RF channels will be automatically adjusted to maintain the maximum available disk (SSD) bandwidth.
- Quan/Bandwidth – Adjust both quantisation (bit depth) and recorded signal bandwidth. Changing bandwidth will clear the RF channel settings requiring new RF channel selection by the user.
- RF Channel 1/2/3 – Configure the centre frequency for each available RF channel. Only frequencies containing valid GNSS signals for the selected bandwidth will be shown. In addition to this, once a frequency has been selected on one channel, the same frequency cannot be used on another channel.
Allows control over how LabSat will replay a file.
- Loop – Selected file will replay continuously.
- From – Specify a time in the scenario to replay from.
- For – Specify how long the scenario will replay for.
Allows control over how LabSat will record a file.
- For – Specify how long the LabSat will record for.
Most user configurable device settings are accesses from the SETUP menu.
- CLK REF
- OCXO – Configure clock to OCXO (Oven Controlled Oscillator).
- TCXO – Configure clock to TCXO (Temperature Controlled Oscillator).
- External 10 MHz – Configure clock to 10 MHz external signal.
- REF OUT – Output a 10 MHz reference signal for use by other systems (available when OCXO or TCXO is selected).
- CH1 to CH4
- CAN1 – Record CAN Bus channel 1.
- CAN2 – Record CAN Bus channel 2.
- 1PPS – Record 1PPS signal from internal GNSS monitor (disable power save).
- RS232 – Record RS232 signal.
- DIGI 1 – Record state of DIGI input signal.
- DIGI 2 – Record state of DIGI input signal.
- CH1 to CH4
- Log File – When selected the CAN data will be logged into a separate .txt file.
- CAN1 – Set the desired baud rate.
- CAN2– Set the desired baud rate.
- Silent Record – Determines whether or not the LabSat sends an acknowledge pulse during recording (both channels).
- Static IP – Enable/Disable Static IP.
- IP – Set the IP address assigned to LabSat 3 Wideband (available when Static IP is selected).
- Mask – Set the Subnet mask assigned to LabSat 3 (available when Static IP is selected).
- GW – Set the default gateway for the network (available when Static IP is selected).
- Display – Adjust display contrast and backlight brightness.
- Power Save – When selected, will power down display backlight and internal monitor during recording.
- Time – Configure internal clock using UTC time from internal GNSS monitor or set manually.
About – Contains information specific to the LabSat, e.g. serial number and firmware version.
Exit – Return to file list.