Radar sensor for motor vehicles

Abstract

The invention relates to a radar sensor for motor vehicles, comprising a signal generator, which is configured so as to generate a radar signal containing a cyclically repeating sequence of N wave trains Wj, j = 1, N, which can be successively sent at time intervals T'c,j and occupy respective frequency bands that differ from each other in terms of the centre frequencies fc,j thereof, characterised in that, for the time intervals Tc,j and the centre frequencies fc,j, the relation T'c,j* fc,j = X with a constant parameter X holds good.

Description

technical field [0001] The invention relates to a radar sensor for a motor vehicle having a signal generator which is configured to generate a radar signal comprising N wave trains (Wellenzug) W j , a periodically repeated sequence of j=1,...,N, the N wave trains are successively separated by a time interval T' c,j transmit and occupy the corresponding frequency band at its intermediate frequency f c,j different aspects. Background technique [0002] Radar systems for measuring distances, relative speeds and angles of objects such as vehicles and obstacles are increasingly being used in motor vehicles for safety and comfort functions. The accuracy of radar measurements in terms of distance, speed and angle plays an increasingly important role here, since driver assistance systems and automated driving functions require the most accurate possible detection of the surrounding environment. [0003] Furthermore, the separation capability of the radar sensor in terms of all th...

AI Technical Summary

Problems solved by technology

Here too, the following problem arises: the course of the phase change over slow time depends on the carrier frequency, distance and speed, and a change in the carrier frequency leads to a non-linear change in the phase

As a result, velocity estimation (for example by means of Fourier analysis processing) is hampered or not possible at all

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