A system and method facilitating the exchange andor using of a session key to facilitate secure communication is provided. Said sensor system comprises at least one sensor for measuring system states of an application system and at least one system model for describing the application system, which together form at least one first observer for estimating system states in order to provide system states for an allocated data processing device. Following this, the rake fingers of the receiver are placed using the modified delay profile. With the receiver properly equipped to perform this projection operation, interfering signals, multipath, spoofing andor meaconing can be effectively diminished. During the peptization process, hydrolysis and condensation reactions occurs between different metal hydroxyl compounds.