Radar sensor for motor vehicles

Patent metadata

Field	Value
Publication number	US-10018715-B2
Application number	US-201414914835-A
Country	US
Kind code	B2
Filing date	Jun 24, 2014
Priority date	Aug 27, 2013
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A radar sensor for vehicles, including a group antenna, having a linear array of antenna elements, a feed unit for feeding transmission signals having a settable phase relationship into the antenna elements, a control unit controlling the feed unit, and an evaluation device evaluating received radar echoes and angle-resolving locating of objects. The group antenna includes at least two non-interleaved subgroups, the feed unit supplies in-phase transmission signals to the elements, while the transmission signals for the various subgroups have a settable phase difference, the control unit periodically changes the settable phase difference so that the transmission signals have a base phase difference in one measuring cycle and a phase difference in another measuring cycle which differs by a fixed absolute value from the base difference. The control unit sets the base difference based on levels of the received radar echoes to maximize the level difference between the measuring cycles.

First claim

What is claimed is:

1. A radar sensor for a motor vehicle, comprising:
at least one group antenna, which is formed by a linear array of antenna elements;
a feed unit for feeding transmission signals having a settable phase relationship into the antenna elements;
a control unit to control the feed unit; and
an evaluation device to evaluate received radar echoes and for angle-resolving locating of objects;
wherein the group antenna is divided into at least two subgroups, which are not interleaved, the feed unit is configured to supply in-phase transmission signals to the antenna elements of each subgroup, while the transmission signals for the various subgroups have a settable phase difference, the control unit is configured to periodically change a settable phase difference from measuring cycle to measuring cycle so that the transmission signals have a base phase difference in one measuring cycle and a phase difference in another measuring cycle which differs by a fixed absolute value from the base phase difference, and the control unit is configured to set the base phase difference based on the levels of the received radar echoes to maximize the level difference between the measuring cycles.

2. The radar sensor of claim 1 , wherein the at least one group antenna is oriented vertically.

3. The radar sensor of claim 1 , wherein the control unit is configured to store a standard value for the base phase difference, which compensates for an alignment error during the installation of the radar sensor in the motor vehicle.

4. The radar sensor of claim 3 , wherein the control unit is configured to determine the stored standard value by statistical evaluation of the elevation angles measured for a plurality of objects.

5. A radar sensor for a motor vehicle, comprising:
at least one group antenna, which is formed by a linear array of antenna elements;
a superposition unit to superimpose received signals of the antenna elements with a settable phase relationship;
a control unit to control the superposition unit; and
an evaluation device to evaluate the received radar echoes and for angle-resolving locating of objects;
wherein the group antenna is divided into at least two subgroups, which are not interleaved, the superposition unit is configured to superimpose the received signals of the antenna elements of each subgroup in phase, while the received signals of the various subgroups are superimposed with a settable phase difference, the control unit is configured to change the settable phase difference from measuring cycle to measuring cycle periodically so that the received signals have a base phase difference in one measuring cycle and a phase difference in another measuring cycle which differs from the base phase difference by a fixed absolute value, and the control unit is configured to set the base phase difference based on the levels of the received radar echoes to maximize the level difference between the measuring cycles.

6. The radar sensor of claim 5 , wherein the at least one group antenna is oriented vertically.

7. The radar sensor of claim 5 , wherein the control unit is configured to store a standard value for the base phase difference, which compensates for an alignment error during the installation of the radar sensor in the motor vehicle.

8. The radar sensor of claim 7 , wherein the control unit is configured to determine the stored standard value by statistical evaluation of the elevation angles measured for a plurality of objects.

Assignees

• Bosch Gmbh Robert

Inventors

• Steinhauer Matthias
• Hellinger Raphael

Classifications

• G01S13/4445

  amplitude comparisons monopulse, i.e. comparing the echo signals received by an antenna arrangement with overlapping squinted beams · CPC title

• G01S13/34

  using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal · CPC title

• G01S3/20

  derived by sampling signal received by an antenna system having periodically-varied orientation of directivity characteristic · CPC title

• G01S3/44

  the adjustment being varied periodically or continuously until it is halted automatically when the desired condition is attained · CPC title

• G01S13/4463

  using phased arrays · CPC title