A polarimetric radar system for detecting and classifying objects (78, 80, 82, 84) positioned in an interior of a vehicle, the radar system comprising - at least one radar transmitter unit that is configured for transmitting radar waves of at least two different polarizations, - at least one radar receiving unit that is configured for receiving radar waves of at least two different polarizations, - a radar signal generating unit that is configured to generate and to provide radar waves to be transmitted by the at least one radar transmitter unit, - a signal processing circuitry that is configured for processing the generated radar waves to be transmitted and the received radar waves, and - a signal evaluation unit that is configured - to receive processed signals from the signal processing circuitry, - to estimate values for a set of predetermined object parameters, including the permittivity of the object, on the basis of the received processed signals, - to select an object class that corresponds to a specific predetermined set of object parameters, including the permittivity of the object, out of a plurality of predetermined sets of object parameters from a plurality of predetermined object classifications upon detecting a match of the estimated values for the set of object parameters with the specific predetermined set of object parameters, wherein the predetermined set of object parameters comprises a predetermined range for each parameter of the set of object parameters, and the term "match" includes that each estimated value for an object parameter of the set of predetermined object parameters lies within the predetermined range for the parameter, for all parameters of the set of object parameters, and - to provide an information that is indicative of the at least one classified object. - at least one radar transmitter unit that is configured for transmitting radar waves of at least two different polarizations, - at least one radar receiving unit that is configured for receiving radar waves of at least two different polarizations, - a radar signal generating unit that is configured to generate and to provide radar waves to be transmitted by the at least one radar transmitter unit, - a signal processing circuitry that is configured for processing the generated radar waves to be transmitted and the received radar waves, and - a signal evaluation unit that is configured - to receive processed signals from the signal processing circuitry, - to estimate values for a set of predetermined object parameters, including the permittivity of the object, on the basis of the received processed signals, - to select an object class that corresponds to a specific predetermined set of object parameters, including the permittivity of the object, out of a plurality of predetermined sets of object parameters from a plurality of predetermined object classifications upon detecting a match of the estimated values for the set of object parameters with the specific predetermined set of object parameters, wherein the predetermined set of object parameters comprises a predetermined range for each parameter of the set of object parameters, and the term "match" includes that each estimated value for an object parameter of the set of predetermined object parameters lies within the predetermined range for the parameter, for all parameters of the set of object parameters, and - to provide an information that is indicative of the at least one classified object. - to estimate values for a set of predetermined object parameters, including the permittivity of the object, on the basis of the received processed signals, - to select an object class that corresponds to a specific predetermined set of object parameters, including the permittivity of the object, out of a plurality of predetermined sets of object parameters from a plurality of predetermined object classifications upon detecting a match of the estimated values for the set of object parameters with the specific predetermined set of object parameters, wherein the predetermined set of object parameters comprises a predetermined range for each parameter of the set of object parameters, and the term "match" includes that each estimated value for an object parameter of the set of predetermined object parameters lies within the predetermined range for the parameter, for all parameters of the set of object parameters, and - to provide an information that is indicative of the at least one classified object.