Introduction

Detector noise and photon shot noise are expected to limit the sensitivity of PRIMA observations, but are not expected to introduce significant systematic errors into the astrometric observations. It will be important to have a reasonably realistic model of the detector noise for the PRIMA FSUs. The simulations presented in this document do not take account of detector noise and photon shot noise - it will be important to incorporate these effects in the models of the fringe tracking performance discussed in Section 28.