Abstract:
In a method for operating a radar sensor, the unambiguousness range of the radar sensor is increased with respect to the range and/or the relative velocity by: transmitting multiple ramp sets by the radar sensor, the frequency ramps of the individual ramp sets each differing in one system parameter; adapting the sampling frequency during the detection of the radar echoes in such a way that a constant number of samples always results for each frequency ramp; and, to evaluate the radar signals, the spectra are periodically continued and compared to each other.
Abstract:
A method for evaluating obstacles based on locating data of a radar sensor in a driver assistance system for motor vehicles, in which at least one evaluation function is calculated which indicates, as a function of a set of measured variables which are related to a potential obstacle, whether the potential obstacle is to be evaluated as a real obstacle, a complexity indicator being formed based on the locating data which indicates the complexity of a present measurement situation, and at least two different evaluation functions being defined for the same set of measured variables, and it being decided which of the evaluation functions is applied in the present measurement situation as a function of the complexity indicator.
Abstract:
An FMCW radar sensor system is described having an antenna covered by a radome, a mixer for mixing a frequency-modulated transmission signal with a signal received by the antenna, a device for recording the mixed product of the mixer as a time-dependent signal, a device for calculating the spectrum of the time-dependent signal, and a device for detecting a reflecting coating on the radome, characterized in that the device for detecting the reflecting coating is configured for analyzing the time-dependent signal and for determining the extent of reflection on the radome based on the amplitude of this signal.
Abstract:
In a method for frequency matching in an FMCW radar sensor, a plurality of frequencies, which are derived on various modulation ramps, and which respectively are shown by the radar sensor in a d-v space as geometrical locations, represent possible combinations of a distance d and a speed v of the respective object. In order to identify the objects located on the various modulation ramps, coincidences between the geometrical locations which belong to frequencies derived on various modulation ramps are searched for. The search for coincidences is initially restricted in a first step to a subspace of the d-v space, and in a subsequent step, the search is extended to other regions of the d-v space, while suppressing the frequencies that are associated with the objects found in the first step.
Abstract:
An optical drilling device using a laser beam (5), having an optical arrangement located in the beam path for guiding the laser beam (5) along a circular cutting path and a focusing lens system (6) located downstream from the arrangement and focusing the laser beam (5) onto a workpiece (7). Maintaining a simple design, the various parameters can be easily set by providing the optical arrangement with a separately rotatable image rotator (4) which guides the beam along the cutting path.
Abstract:
An integrated acoustooptical component for frequency-shifting optical frequencies is proposed, in which two separately guided optical waveguides exhibit an optical coupling region, which is designed in the manner of a directional coupler and in which the two optical waveguides exhibit a small spacing from one another generating an optical coupling. The acoustic waves of a sound generator propagate in the longitudinal direction over the coupling region. The two optical waveguides exhibit differing propagation constants for light. If, for example, light of mode a is injected into the optical waveguide and if the sound generator is energised, then the photons of mode a are scattered at the phonons of the acoustic waves and converted into mode b of the optical waveguide, where they can propagate. This gives rise to a frequency shifting. Accordingly, the acoustooptical component includes a frequency shifter and at the same time a coupler, which can be used for beam splitting and/or as an optical switch.
Abstract:
In a method for operating a MIMO radar, an influence of an object motion on an angle estimate is substantially eliminated, and a time multiplex schema having a transmission sequence and transmission instants of transmitters of the MIMO radar is identified by optimizing the following mathematical relationship: d _ pulses , opt = arg max d _ pulses [ Var S ( d _ pulses ) - ( Cov S ( d _ pulses , t ) ) 2 / Var S ( t _ ) ] in which: dpulses,opt is optimized positions of the transmitters in the sequence in which they transmit; dpulses is positions of the transmitters in the sequence in which they transmit; t is transmission instants; VarS is sample variance; and CovS is sample covariance.
Abstract:
A radar sensor device having at least one planar antenna device that includes a plurality of vertically oriented antenna columns which are configured as a sparse array in one plane in parallel at defined mutual distances and which each have at least two line-fed patch elements, the sparse array of antenna columns is designed to have such a minimal redundancy that the amount of defined distances among the antenna columns in the sparse array is at least equal to all of the different distances between any two antenna columns of a corresponding non-sparse array of a planar antenna device having the same antenna aperture and the same characteristics of the antenna columns, but is the most minimum possible number.
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. In addition, in a method for determining a distance and/or a speed of a target, a radar signal is transmitted in a direction of the target and a reflected radar echo is received, for which at least two transmission/reception channels are used whose signal paths each include an antenna and a mixer; at least one mixture is switched over from a first into a second operating state, in order to use the mixer, in the first operating state, bidirectionally as a transfer mixture, and, in the second operating state, in an at least approximately isolating manner as a receiving mixer.
Abstract:
A radar sensor having a corresponding evaluation and control device, which has a measuring mode for locating radar targets and a blindness detection device, which is configured to detect blinding of the radar sensor with the aid of the signals received by the radar sensor itself; wherein the evaluation and control device has a test mode, in which the radar sensor is controlled on the basis of parameters that are different from the parameters for the measuring mode and optimized for the blindness detection device, and the evaluation and control device has a switching device for switching over between the measuring mode and the testing mode.