APME+: Specifically tuned for short-delay multipath
Reflections from nearby surfaces (roof, ground, building, etc), are the most prevalent and also the most treacherous. Signals reflected by nearby surfaces (<20m distance) arrive at the antenna with only a short delay compared to the straight signal. They are therefore difficult to differentiate from the straight signal and many mitigation algorithms do not perform good against them.
Figure 3 shows the effect of APME+ on the position accuracy in DGNSS mode.
APME+ is enabled by default in all Septentrio receivers.