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GPS L5 Signal

Health Status Configuration

The DAN-F10N supports both GPS L1 C/A and L5 signals. Broadcasting of Civil Navigation (CNAV) messages on the L5 signal began in April 2014. At the time of writing, GPS L5 signals remain pre-operational and they are set unhealthy until sufficient monitoring capability is established. To evaluate GPS L5 signals before they become fully operational, the receiver can be configured to ignore the GPS L5 health status by overriding it with the respective GPS L1 C/A signal status.

  • Do not use unhealthy, pre-operational GPS L5 signals for safety-of-life or other critical purposes. This is an operational issue concerning the satellites/space segment; not a limitation or specific configuration of u-blox products.
  • Customers who choose to ignore the GPS L5 signal health status in their production system do so at their own risk and must be fully aware of the implications. The system should also include a mechanism to revert to the mode where the L5 signal health status is respected.

Enable GPS L5 Signal

To ignore the GPS L5 signal health status and override it with the respective GPS L1 signal health status, send the configuration string given in Table 3. The configuration can be stored in RAM, battery-backed RAM (BBR), and flash layers. Stored in the RAM layer, the device returns the UBX-ACK-ACK message if the configuration is sent successfully and it is applied immediately without a configuration reset. To apply the configuration stored in the BBR and flash layers, send the UBX-CFG-RST message with resetMode 0x01.

Configuration layer Configuration string
RAM 
B5 62 06 8A 09 00 01 01 00 00 01 00 32 10 01 DF F6
BBR 
B5 62 06 8A 09 00 01 02 00 00 01 00 32 10 01 E0 FE
FLASH 
B5 62 06 8A 09 00 01 04 00 00 01 00 32 10 01 E2 0E

Table 3: UBX binary string to override GPS L5 signal health status with GPS L1 health status

Disable GPS L5 Signal

To revert back to the default configuration, send the configuration string given in Table 4. The device returns the UBX-ACK-ACK message if the configuration is sent successfully and it is applied immediately without a reset in the RAM layer. To apply the configuration stored in the BBR and flash layers, send the UBX-CFG-RST message with resetMode 0x01.

Configuration layer Configuration string
RAM 
B5 62 06 8A 09 00 01 01 00 00 01 00 32 10 00 DE F5
BBR 
B5 62 06 8A 09 00 01 02 00 00 01 00 32 10 00 DF FD
FLASH 
B5 62 06 8A 09 00 01 04 00 00 01 00 32 10 00 E1 0D

Table 4: UBX binary strings to revert the GPS L5 signal health status monitoring to default