Volkswagen Ag

S.m.s. Smart Microwave Sensors Gmbh

Marc Behrens

Ralph Mende

Marc-Michael Meinecke

Thanh-Binh To

A measuring device , e.g., a measuring device for a motor vehicle, is for measuring a distance between the measuring device and at least one object and/or measuring a difference in speed between the measuring device and the at least one object. The measuring device includes an emitting apparatus for transmitting a transmission signal encompassing at least two sequences of signal portions, a first sequence of signal portions and a second sequence of signal portions with two respective temporally alternating signal portions. The frequency of at least two signal portions of a sequence of signal portions differs by one respective difference frequency, the difference frequency of the first sequence of signal portions being different from the difference frequency of the second sequence of signal portions.

Measuring device for a motor vehicle

For detection of an electromagnetic signal, which is transmitted from a transmitting antenna (), by means of at least two at least essentially identical receiving antennas (), whose sensitivity curve has a maximum (M) with falling flanks as well as sidelobes (SL) adjacent to it with sensitivity increased again at a reception angle symmetrically with respect to a basic alignment, with angle determination for an object which reflects the transmitted signal being carried out by the two receiving antennas () by phase determination in an unambiguous interval (&#x3b8;) whose boundaries (L) are predetermined by the distance (d) between the receiving antennas (), the distance (d) is chosen such that the boundaries (L) of the unambiguity area (&#x3b8;) intersect the sidelobes (SL), and the reflective object is detected by means of vectorial addition of the signals from the receiving antennas (), after which the parameters R, v are determined.

Method and apparatus for detection of an electromagnetic signal reflected from and object

In a method for determination of the length of objects in traffic, especially passenger cars, trucks, buses, motorbikes, bicycles and pedestrians, radar signals are transmitted by a vehicle, the radar signals are reflected by an object being measured, the reflected radar signals are received in the vehicle, the frequency spectra of the reflected radar signals are evaluated, and the reflection peaks contained in the frequency spectra are determined. Length measurement, by means of known radar sensors, from a vehicle is made possible by the fact that the width of the reflection peaks is determined, and that the length of the object being measured is determined by means of the determined width.

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Braunschweig, Germany

Marc Behrens