Hi,
We get the likelihood of undetected early path value (described in APS006 Part3) greater than zero even in LOS. 3-4 peaks always seems to be present before the detected first path. What could be the reason?
What is your environment? Could they be long reflection path echos?
Generally with LoS the direct path will be if not the strongest then one of the stronger signals, you’d have to have a very strange environment for a reflection to be significantly stronger than the direct signal.
But it is possible for long reflection paths to generate false correlation spikes that are so late they look like early signals for the next pulse.
Thanks for the reply.
We had some issues reading the accumulator that gave wrong number of peaks. We could correct it and now we get undetected early paths below the threshold level in some NLOS situations. Thanks.
Hi @AndyA . Do I have to read all 992 samples in Accumulator CIR memory for calculating likelihood of undetected early path value?
Normally yes.
Unless you know where the early path is going to be you can’t check for it unless you read all the data.
If you are in an known environment where you know there is a possibility of an error of a fixed size you could only check one section but that is very much a special case situation.