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US 9,791,549 B2Granted
Radar sensor and method for operating a radar sensor
AssigneeRobert Bosch GmbH
InventorsJingying Bi, Goetz Kuehnle
Life of this patent
Estimating the term…
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.
Claims18
A radar sensor, comprising:
- a transceiver unit configured to transmit a sequence of modulated rapid-chirp radar signals and to receive radar echoes of the transmitted rapid-chirp radar signals which are reflected by an object;
- and
- a sampling device configured to sample the received radar echoes at a sampling frequency;
- wherein:
- the transmitted rapid-chirp radar signals include at least two ramp sets;
- each of the at least two ramp sets has a plurality of frequency ramps;
- each frequency ramp of a ramp set has a ramp period and a frequency deviation, and, within each of the at least two ramp sets, all of the frequency ramps of the ramp set have the same ramp period as one another and the same frequency deviation as one another;
- two consecutive frequency ramps have a time difference, and within each of the at least two ramp sets, the time differences between consecutive frequency ramps of the ramp set are the same as one another;
- the transceiver unit transmits the at least two ramp sets, wherein the at least two ramp sets differ from one another in one of the ramp period and the time difference between consecutive frequency ramps, but not both the ramp period and the time difference between consecutive frequency ramps;
- and
- the sampling device varies the sampling frequency for each ramp set.
8 more elements
A method for operating a radar sensor, comprising:
- transmitting a sequence of modulated rapid-chirp radar signals;
- receiving radar echoes of the transmitted modulated rapid-chirp radar signals which are reflected by an object;
- and
- detecting the received radar echoes at a predefined sampling frequency;
- wherein:
- the transmitted modulated rapid-chirp radar signals include a plurality of ramp sets;
- each of the plurality of ramp sets has a plurality of frequency ramps;
- each frequency ramp of a ramp set has a ramp period and a frequency deviation, and within each of the plurality of ramp sets, all of the frequency ramps of the ramp set have the same ramp period as one another and the same frequency deviation as one another;
- two consecutive frequency ramps have a time difference, and within each of the plurality of ramp sets, the time differences between consecutive frequency ramps of the ramp set are the same as one another;
- the plurality of ramp sets differ from one another in one of the ramp period and the time difference between consecutive frequency ramps, but not both the ramp period and the time difference between consecutive frequency ramps;
- and
- the predefined sampling frequency is varied for each ramp set.
9 more elements
A radar sensor for a motor vehicle, comprising:
- a transceiver unit configured to transmit a sequence of modulated rapid-chirp radar signals and to receive radar echoes of the transmitted rapid-chirp radar signals which are reflected by an object;
- and
- a sampling device configured to sample the received radar echoes at a sampling frequency;
- wherein:
- the transmitted rapid-chirp radar signals include multiple ramp sets;
- each of the multiple ramp sets has a plurality of frequency ramps;
- each frequency ramp of a ramp set has a ramp period and a frequency deviation, and, within each of the multiple ramp sets, all of the frequency ramps of the ramp set have the same ramp period as one another and the same frequency deviation as one another;
- two consecutive frequency ramps have a time difference, and within each of the multiple ramp sets, the time differences between consecutive frequency ramps of the ramp set are the same as one another;
- the transceiver unit transmits the multiple ramp sets, wherein the multiple ramp sets differ from one another in at least one of the ramp period and the time difference between consecutive frequency ramps;
- the difference in the at least one of ramp period and the time difference between consecutive frequency ramps of the multiple ramp sets is dynamically adapted according to a speed of the motor vehicle;
- and
- the sampling device varies the sampling frequency for each ramp set.
9 more elements
A method for operating a radar sensor, comprising:
- transmitting a sequence of modulated rapid-chirp radar signals;
- receiving radar echoes of the transmitted modulated rapid-chirp radar signals which are reflected by an object;
- and
- detecting the received radar echoes at a predefined sampling frequency;
- wherein:
- the transmitted modulated rapid-chirp radar signals include a plurality of ramp sets;
- each of the plurality of ramp sets has a plurality of frequency ramps;
- each frequency ramp of a ramp set has a ramp period and a frequency deviation, and, within each of the plurality of ramp sets, all of the frequency ramps of the ramp set have the same ramp period as one another and the same frequency deviation as one another;
- two consecutive frequency ramps have a time difference, and within each of the plurality of ramp sets, the time differences between consecutive frequency ramps of the ramp set are the same as one another;
- the plurality of ramp sets differ from one another in at least one of the ramp period and the time difference between consecutive frequency ramps;
- the difference in the at least one of the ramp period and the time difference between consecutive frequency ramps of the plurality of ramp sets is dynamically adapted according to a speed of the motor vehicle;
- and
- the predefined sampling frequency is varied for each ramp set.
10 more elements
Dependencies are inferred from the claim text.