Autoliv Asp, Incorporated

Autoliv Development Ab

Dirk Klotzbuecher

Walter Poiger

Wolfgang Lauer

Florian Trompeter

The present invention relates to a vehicle radar system () arranged to detect objects outside a vehicle (). The radar system () a radar detector () and a processing unit (). The processing unit () is arranged to obtain values for detected target angle (&#x3b8;) and detected target Doppler velocity (v) relative the radar detector () for each detected object (') during a certain time interval. If there is a zero crossing () for a derivative () of a function () describing the progression of detected target Doppler velocity (v) as a function of detected target angle (&#x3b8;), the processing unit () is arranged to detect the zero crossing (). This zero crossing () is indicative of a radar system misalignment (&#x3b8;). The present invention also relates to a corresponding method.

Misalignment processing for a vehicle radar sensor

A radar apparatus and method for determining the range to and velocity of at least one object comprising, transmitting a plurality of RF signals, each comprising a particular frequency and being transmitted during a particular unique finite period, the plurality of signals collectively comprising at least one first subset of signals having the same frequency and at least one second subset of signals having different frequencies, receiving the plurality of signals after reflection from an object, determining a phase difference between each of the signals and the corresponding reflected signal, each piece of phase difference information herein termed a sample, organizing the samples in two-dimensions wherein, in a first dimension, all samples have the same frequency and, in a second dimension, all consecutive samples are separated from each other by a fixed time interval; processing the samples in the first dimension to determine a phase rotation frequency corresponding to the samples in the first dimension, the phase rotation frequency comprising a Doppler frequency for the at least one object, processing the samples in the second dimension to determine a second phase rotation frequency corresponding to the samples in the second dimension; the phase rotation frequency comprising Doppler frequency and range frequency for the at least one object; comparing the first phase rotation frequency to the second phase rotation frequency to distinguish range frequency from Doppler frequency of the at least one object; and converting the Doppler frequency to a velocity of the object and converting the range frequency to a range of the object.

Method and apparatus for radar signal processing

The present invention relates to a method and device for determining a relative velocity between a host () and a target (). The present invention relates in particular to a method of the type that can be used in motor vehicle radar systems and specifically in radar systems of the type that detect obstacles in a blind spot of a motor vehicle. In the method according to the invention the following steps are carried out: substantially simultaneously determining a value for a radial velocity and a bearing with regard to a predefined spatial direction for a large number of measurement points () on the target (); calculating a large number of quotients from the radial velocity and the cosine of the associated bearing, a quotient being calculated for each of the measurement points (); determining an estimated relative velocity between the host () and the target () by forming an average of the large number of quotients.

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Wuerzburg, Germany

Dirk Klotzbuecher