u-blox has upgraded the firmware for its u-blox 6 GPS platform to offer improved sensitivity, significantly lower power consumption, improved anti-jamming performance, jamming detection and shorter time to first fix (TTFF).
At the top of the list of upgrades is improved tracking sensitivity down to -162 dBm with enhanced acquisition and re-acquisition sensitivity. Other new features include AssistNow Autonomous, a free feature similar to Assisted-GPS without the need for a host or external network connection. The concept reduces TTFF by capitalising on the periodic nature of GPS satellites, allowing the GPS receiver to autonomously predict satellite positions based on previously captured ephemeris.
An intelligent power management technique has been implemented, allowing the receiver to independently power down unnecessary circuitry when not needed, while maintaining GPS performance levels. The result is a claimed power saving of more than 50% in weak signal environments compared to the previous firmware.
The new jamming detection feature gives the GPS receiver the ability to detect the possible presence of GPS jammers. This can add a significant level of security and robustness, for example when dealing with vehicle theft. Security systems can use this feature to activate an alarm or alert signal, or initiate a backup positioning system such as one based on GSM.
Another new feature is support for the RTCM (Radio Technical Commission for Maritime Services) protocol, allowing receivers to increase positional accuracy in maritime applications using differential correctional data received by RTCM beacons.
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