What can be done about GNSS signals in urban canyons where the signal is blocked?

       

Handling of GNSS signals in urban canyons where the signal is blocked: because this scenario is very easy to encounter and is unavoidable. As we all know that GNSS receivers are all dependent on the sky, if they are blocked, the signal will inevitably weaken or disconnect. Therefore, some powerful satellite receiving antennas are needed here, preferably antennas that have been co-commissioned with these devices to do the capture of satellite stabilized signals, as well as the multipath effect of buildings in urban areas.

        In the signal blocking area (such as flyovers and tunnels), it is necessary to use the combination of navigation + visual lane lines to do to assist, and the use of high-precision maps, in advance to know the signal blind or weak areas, and then use the inertial guidance and vision to do the intervention of real-time SLAM technology, which can greatly improve the stability.