move_base with own localization

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Hello together

This is my first attempt at using the navigation stack. I have written my own node to localize my robot using a laser scanner and kalman fitler,the odometry is not reliable enough. The localization gives me the pose of the robot. I would now like to use move_base with my determined pose to drive to certain goals. I wouldlike, that move_base relies only on my localization, because the odometry is ot reliable enough. How can I tell the move_base node to use my own pose?

Thanks allot in advance!

---------Update-------------- After yout post I looked into AMCL and saw, that this could as well solve my problem. I have a map consisting of four landmarks and I know the starting position. The laser will register at least two of those landmarks, which is sufficient for a localization in 2D (afaik...). The problem is, that the laser will as well register allot of "noise" inside and outside the desired area (people and robots moving). But if I limit the region of interest for amcl to the area without noise, which contains all the landmarks, shouldn't it be possible to use AMCL as it is? If so, how can I limit the information provided by the topic scan to the region of interest? Can I write a node, which takes the scan informations, eliminates all unneeded scans and passes the filtered data?

P.s.(should i post this as a knew question?)

Thanks in advance