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In the year 2006 the Institute of Communications and Navigation of the German Aerospace Center started the development of a multi-antenna real-time receiver platform to demonstrate the performance gain of digital beamforming technologies for satellite navigation, especially in the field of safety critical applications. For those safety critical applications a reliable and precise navigation solution is crucial. It was clear at the very beginning that the impact of interference on the system has to be considered at each stage of the receiving chain from the single antenna element to the position solution. For this reason a completely new receiver design was necessary, which provides access to each part in the receiver to take appropriate counter measures against almost any kind of interference and jamming. In the current stage of the receiver robust adaptive beamforming has been developed and implemented. The algorithm manages to reach the theoretical bound of signal power boost which is approx. 7 dB for a square 2x2 antenna array if mutual couplings are taken into account. The direction of arrival of impinging GNSS satellite signals can be estimated within 2-3 degrees of accuracy thanks to a novel calibration method. This is a very powerful and effective tool for detecting and mitigating spoofing, interference and multi path. Due to its real-time capability, the effects of multi path signals, interference and other kind of distortions can be directly detected and assessed online for signal monitoring purposes, e.g. GBAS ground stations. The paper will give detailed insights into the necessary measures and developments for achieving the desired …