Abstract: A radar sensor for motor vehicles includes: a transmit and receive component, which includes a mixer for mixing a transmitted signal with a received signal; an evaluation circuit which is connected to an output of the mixer by a direct voltage coupling device; and a compensation device for compensating a DC offset in the output signal of the mixer, the compensation device being subdivided into a rough compensation device in the transmit and receive component, and a fine compensation device in the evaluation circuit.

Abstract: A radar sensor for motor vehicles includes a plurality of transmission and receiving antennas, which differ in their azimuthal directivity characteristic and to which a separate mixer is assigned, which mixes a transmitted signal with a received signal, at least one of the mixers being a transfer mixer, and at least one other of the mixers having a lower transfer output, wherein the assignment of the transmission and receiving antennas is asymmetrical with respect to the mixers differing in their transfer output.

Abstract: Mixer unit for a radar sensor for motor vehicles, having an I mixer and a Q mixer which are connected in parallel branches between an oscillator port and an RF port with the aid of power splitters. A switch is situated between each of the power splitters and the Q mixer which allows the signal arriving from the power splitter to be selectively decoupled from the Q mixer and switched to a high-frequency ground. A transformation element is provided between the high-frequency ground and the particular node point of the power splitter which transforms the high-frequency ground into an open line at the node point.

Abstract: A monitoring device and to a method for monitoring a proper operational state of a transmission link having multiple channels, each of which is configured for the differential transmission of signals, including the following steps: feeding differential signals at a first end of the transmission link to be monitored; converting the signals received at a second end of the transmission link to be monitored into difference signals, a difference signal being formed for each channel; and comparing a quality criterion which is dependent on the distribution of the values of the difference signals to a threshold value. The quality criterion depends on the variance of the logarithms of the difference signals across the channels, for example.

Abstract: A radar sensor includes: an oscillator for generating a transmission signal; a mixer for generating an intermediate-frequency signal by mixing a part of the transmission signal with a received signal; and an offset-compensation unit for generating an oscillating compensation signal, which is sent to the mixer in addition to the aforementioned part of the transmission signal.

Abstract: A circuit configuration for radar applications having a printed board and semiconductor modules mounted on it, each of the semiconductor modules including an integrated circuit, a rewiring layer for connecting the integrated circuit to the printed board and at least one antenna element integrated into the semiconductor module and connected to the integrated circuit for transmitting and/or receiving radar signals, the integrated circuit including at least one HF oscillator and a frequency splitter connected to the HF oscillator, the circuit configuration including phase-locked loops for controlling the HF oscillators, each of the phase-locked loops having the frequency splitter and a phase detector for comparing a split-frequency signal of the HF oscillator with a reference signal, and the reference signals may be fed to the phase-locked loops via the printed board.

Abstract: A method for ascertaining and compensating for a misalignment angle of a radar sensor of a vehicle, includes generating a first set of data which contains information about a measured alignment of the radar sensor with respect to an instantaneous movement of the vehicle; generating a second set of data which contains information about a measured alignment of the reference axes defined at the vehicle with respect to the instantaneous movement of the vehicle; ascertaining a misalignment angle by comparing the generated first set of data to the generated second set of data; compensating for the ascertained misalignment angle by changing an emission direction of the main lobe of the antenna characteristic as a function of the ascertained misalignment angle.

Abstract: Radar sensor having a mixer for mixing a received signal with a reference signal and having a device for compensating interference signals which would overload the mixer, wherein the device for compensating the interference signals has an adjustable reflection point at the reference input of the mixer.

Abstract: In a multibeam radar sensor apparatus having at least two transmission/reception channels, whose signal paths each include an antenna and a mixer, at least one first mixer is configured bidirectionally as a transfer mixer, and at least one second mixer is switchable from a first into a second operating state; in the first operating state, the mixer is bidirectionally configured as a transfer mixer, and in the second operating state, the mixer being configured in an at least approximately isolating manner as a receiving mixer.

Abstract: A radar sensor for motor vehicles, having a transmitting antenna in the form of a planar group antenna having multiple antenna elements situated side by side on a shared planar substrate, and having a feed network and a switching device for supplying microwave power to the antenna elements. The antenna elements are situated at equal distances in at least one row; the feed network is designed for supplying the antenna elements with the microwave power having a phase shift which increases at constant increments from one end of the row to the other; and the switching device is designed for controlling the supply of the microwave power to the antenna elements in such a way that, depending on the operating mode, the supply is implemented in a mirror-inverted fashion from opposite ends of the at least one row.

Abstract: A monostatic multi-beam radar sensor includes a group antenna and a mixer system made up of a plurality of transfer mixers connected to antenna elements of the group antenna. A first number of the transfer mixers is switched to isolation mode and a second number of the transfer mixers is switched to transfer mode in order to realize different directional characteristics for the transmit and receive operation.

Abstract: A radar sensor for motor vehicles includes: a transmit and receive component, which includes a mixer for mixing a transmitted signal with a received signal; an evaluation circuit which is connected to an output of the mixer by a direct voltage coupling device; and a compensation device for compensating a DC offset in the output signal of the mixer, the compensation device being subdivided into a rough compensation device in the transmit and receive component, and a fine compensation device in the evaluation circuit.

Abstract: A monostatic multibeam radar sensor device for a motor vehicle, including a directional characteristic of an antenna unit having at least one transceiving channel and at least one receiving channel, and including a mixer system, which has an at least approximately isolating mixer for at least one of the receiving channels. The at least approximately isolating mixer includes a Gilbert cell mixer, which, due to a non-ideal isolation between an input of the local oscillator signal and the corresponding receiving channel, emits a transmission power via this receiving channel, using an overcoupling signal, the transmission power influencing the directional characteristic of the antenna unit and the directional characteristic being switchable by controlling the phase position of the overcoupling signal.

Abstract: The radar sensor has a transceiver device for generating a radar signal having a settable output power, a control unit and an interface unit. The transceiver device may be controlled via a digital interface via the interface unit and the control unit. One of the lines of the interface is connected to the control unit, the control unit being designed in such a way that when a predetermined level is present on this line, the output power of the transceiver device is lowered.

Abstract: Radar sensor having a mixer for mixing a received signal with a reference signal and having a device for compensating interference signals which would overload the mixer, wherein the device for compensating the interference signals has an adjustable reflection point at the reference input of the mixer.

Abstract: A radar sensor having a transmission module and a signal stabilizer, which are situated on a shared circuit board, a casing, which accommodates the signal stabilizer and forms a shield against high frequency radiation of the signal stabilizer together with a conductive layer of the circuit board, and having a connection line, which crosses through the shield, to connect the signal stabilizer to the transmission module, in which the connection line is embedded in the circuit board in insulated fashion.

Abstract: A radar system includes at least two modules, each having a phase detector and a first high-frequency source and each having an antenna output and/or each having one or more antennas. At least two modules include a device for synchronization between the first high-frequency source of a first module of the at least two modules and the first high-frequency source of a second module of the at least two modules of the radar system. The phase detector has a first input for a first reference signal. The phase detector also has a second input for a first loop signal. A module for a radar system has the design of one of the modules of the radar system described above.

Abstract: In a multibeam radar sensor apparatus having at least two transmission/reception channels, whose signal paths each include an antenna and a mixer, at least one first mixer is configured bidirectionally as a transfer mixer, and at least one second mixer is switchable from a first into a second operating state; in the first operating state, the mixer is bidirectionally configured as a transfer mixer, and in the second operating state, the mixer being configured in an at least approximately isolating manner as a receiving mixer.

Abstract: Mixer unit for a radar sensor for motor vehicles, having an I mixer and a Q mixer which are connected in parallel branches between an oscillator port and an RF port with the aid of power splitters. A switch is situated between each of the power splitters and the Q mixer which allows the signal arriving from the power splitter to be selectively decoupled from the Q mixer and switched to a high-frequency ground. A transformation element is provided between the high-frequency ground and the particular node point of the power splitter which transforms the high-frequency ground into an open line at the node point.

Abstract: An FMCW radar sensor having a plurality of antenna elements and a supply circuit for supplying transmission signals having ramp-shaped modulated frequencies to the antenna elements, including a switchover device for switching over the supply circuit between a near-field mode, in which the transmission signals supplied to the individual antenna elements have a certain frequency offset, and a far-field mode, in which the frequencies of the transmission signals are identical.