FMCW radar sensor for motor vehicles
An FMWC radar sensor for motor vehicles, having a high-frequency oscillator, which is developed to generate a frequency-modulated transmit signal that has a periodically repeating series of modulation sequences having different modulation patterns, and having an evaluation device for evaluating the received radar echo according to the FMCW principle, wherein the series of the modulation sequences includes a special class of modulation sequences whose duration is longer than that of any other modulation sequence not belonging to this class and whose frequency swing is smaller than that of any other modulation sequence, and the evaluation device is developed to carry out a measurement of the ego velocity of the vehicle on the basis of a radar echo that is received from non-moving objects during the modulation sequences that belong to the special class.
1. An FMCW radar sensor for a motor vehicle, comprising:
a high-frequency oscillator configured to generate a frequency-modulated transmit signal that has a periodically repeating series of modulation sequences featuring different modulation patterns; and
an evaluation device for evaluating the received radar echo according to the FMCW principle;
wherein the series of the modulation sequences includes a first group of modulation sequences and a second group of modulation sequences, wherein the second group of modulation sequences has a longer duration than the first group of modulation sequences, wherein the second group of modulation sequences represents a special class of modulation sequences, and wherein a frequency swing of the special class of modulation sequences is smaller than that of the first group of modulation sequences; and
wherein the evaluation device is configured to carry out a measurement of the ego velocity of the vehicle based on a radar echo that is received from non-moving objects during the modulation sequences that belong to the special class.
2. The FMCW radar sensor as recited in claim 1 , wherein the special class of the modulation sequences includes a modulation sequence whose frequency swing is zero.
3. The FMCW radar sensor as recited in claim 1 , wherein the evaluation device is configured to perform an angle analysis to separate signals of moving objects from the signal received from the non-moving objects.
4. The FMCW radar sensor as recited in claim 1 , wherein the evaluation device is configured to evaluate a ground-clutter signal during the modulation sequences that belong to the special class.
5. The FMCW radar sensor as recited in claim 1 , wherein the FMCW radar sensor includes an angle-resolving sensor.
6. The FMCW radar sensor as recited in claim 5 , wherein the special class of the modulation sequences includes a modulation sequence whose frequency swing is zero.
7. The FMCW radar sensor as recited in claim 5 , wherein the evaluation device is configured to perform an angle analysis to separate signals of moving objects from the signal received from the non-moving objects.
8. The FMCW radar sensor as recited in claim 5 , wherein the evaluation device is configured to evaluate a ground-clutter signal during the modulation sequences that belong to the special class.