Abstract: A method for testing a network made up of network nodes and devices connected to network nodes, includes: determining the network topology, using at least the network topology, using at least the number of network nodes, the network-node identity, and the wiring of the network-node inputs and outputs; and comparing a current network topology to a permanently stored, reference network topology for the network, in order to detect a change in the number and/or type of devices connected to the network, in the number and/or type of network topology, and/or in the number and/or type of network nodes at which a change is present.

Abstract: A method and a device are provided for determining the relative velocity of objects by using transmitted and received microwave radiation. The transmission signal has a carrier frequency which is increased or decreased in a ramp-like manner, and the transmission signal is additionally modulated using a PN code sequence. The reception signal is mixed using the time-delayed PN code sequence and integrated to form a complex correlation gain. The relative velocity of the objects is determined from the variation over time of the correlation result for the mixed and integrated reception signals, and optionally, the distance of the objects is determined from the time delay of the PN code sequence.

Abstract: In a radar system, a switcher is provided for switching over between at least two different directional characteristics, in particular for different distance ranges, of at least two transmitting antennas. On the receiving side, a combined evaluation of the digitized signals of at least two receiving antennas is performed, in the manner of a correlation of the receiving antenna signals.

Abstract: An angle scanning radar system having a group antenna controlled via a beam-shaping network, a coupling device that allows the group antenna to be operated for both the transmitting and receiving directions, and a device to mix radar receiving signals with radar transmitting signals to form a mixed baseband signal, and to digitally evaluate the mixed baseband signal with regard to the solid-angle information.

Abstract: An angle scanning radar system having a group antenna controlled via a beam-shaping network, a coupling device that allows the group antenna to be operated for both the transmitting and receiving directions, and a device to mix radar receiving signals with radar transmitting signals to form a mixed baseband signal, and to digitally evaluate the mixed baseband signal with regard to the solid-angle information.

Abstract: A method for testing a network made up of network nodes and devices connected to network nodes, has the steps: