Device for emitting and receiving electromagnetic radiation

Patent metadata

Field	Value
Publication number	US-11579243-B2
Application number	US-201816754444-A
Country	US
Kind code	B2
Filing date	Oct 11, 2018
Priority date	Dec 20, 2017
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A device for emitting and receiving electromagnetic radiation, in which different antennas are used for the emitting and receiving, a first antenna or first group being used for the transmission in a first polarization form, a second antenna or second group being used for the transmission in a second polarization form, and a third antenna or third group being used for receiving the reflected electromagnetic radiation that was emitted by the first antenna or first group and by the second antenna or second group. The device may be fixed in place on a motor vehicle and used for object detection within the framework of a distance and speed control or a collision avoidance, and the polarimetric information obtained from the different receiving levels during the propagation of the two differently polarized electromagnetic waves via different propagation paths is able to be used for ascertaining a weather-related road condition.

First claim

What is claimed is:

1. A device for emitting and receiving electromagnetic radiation, comprising:
an evaluation circuit;
a first antenna configured to transmit electromagnetic radiation in a first polarization form;
a second antenna configured to transmit electromagnetic radiation in a second polarization form; and
a third antenna comprising:
a first column formed of a first electrical line along which a plurality of first antenna receivers are arranged in series, wherein the plurality of first antenna receivers are configured to receive electromagnetic radiation reflected from the electromagnetic radiation transmitted by the first antenna;
a second column formed of a second electrical line along which a plurality of second antenna receivers are arranged in series, wherein the plurality of second antenna receivers are configured to receive electromagnetic radiation reflected from the electromagnetic radiation transmitted by the second antenna; and
a common connecting electrical distribution line (a) from which the first electrical line, which is of the first column, directly branches for provision, by the first electrical line and to the evaluation circuit, of the received electromagnetic radiation reflected from the electromagnetic radiation transmitted by the first antenna and (b) from which the second electrical line, which is of the second column, directly branches for provision, by the second electrical line and to the evaluation circuit, of the received electromagnetic radiation reflected from the electromagnetic radiation transmitted by the second antenna;

wherein the evaluation circuit is configured to identify which of the received electromagnetic radiation corresponds to the first polarization form of the transmission from the first antenna and which of the received electromagnetic radiation corresponds to the second polarization form of the transmission from the second antenna by a comparison of receiving levels of different portions of the received electromagnetic radiation.

2. The device as recited in claim 1 , wherein the first polarization form and the second polarization form are mutually orthogonal polarizations.

3. The device as recited in claim 1 , wherein the first antenna comprises a column formed of an electrical line along which a plurality of first antenna transmitters are arranged in series, wherein the plurality of first antenna transmitters are configured to transmit in a horizontally polarized manner.

4. The device as recited in claim 3 , wherein the second antenna comprises a column formed of an electrical line along which a plurality of patch antenna transmitters are arranged, wherein the plurality of patch antennas are configured to transmit in a vertically polarized manner.

5. The device as recited in claim 4 , wherein the plurality of first antenna receivers of the third antenna are configured to receive in a horizontally polarized manner according to the first antenna, and the plurality of second antenna receivers of the third antenna are patch antennas that are configured to receive in a vertically polarized manner according to the second antenna.

6. The device as recited in claim 4 , wherein the first antenna has a short distance range and a large opening angle of its detection range, and the second antenna has long distance range and a small opening angle of its detection range.

7. The device as recited in claim 1 , wherein (i) transmission signals of the first antenna, and (ii) transmission signals of the second antenna detect different distance ranges.

8. The device as recited in claim 1 , wherein (i) transmission signals of the first antenna, and (ii) the transmission signals of the second antenna have different opening angles of a detection range.

9. The device as recited in claim 1 , wherein the evaluation circuit is configured to determine polarimetric information of reflecting objects based on a comparison of receiving levels of first and second orthogonal polarization forms of, respectively, the received electromagnetic radiation provided by the first column of the third antenna and the received electromagnetic radiation provided by the second column of the this antenna.

10. The device as recited in claim 9 , wherein different group factors of involved antenna transmitters and antenna receivers and different gain factors of the involved antenna transmitters and antenna receivers are taken into account when determining the receiving levels of the received electromagnetic radiation of the first and second polarization forms.

11. The device as recited in claim 1 , wherein the device is fixed in place on a motor vehicle at the front of the motor vehicle, and performs an object detection for distance control, speed control, or collision avoidance.

12. The device as recited in claim 11 , wherein during propagation of the electromagnetic radiation in the first polarization form and of the electromagnetic radiation in the second polarization form via different propagation paths, the evaluation circuit is configured to (a) assign a change in a receiving level of the received reflected electromagnetic radiation reflected from the electromagnetic radiation transmitted by the first antenna to a change in a direct reflection, (b) assign a change in a receiving level of the received reflected electromagnetic radiation reflected from the electromagnetic radiation transmitted by the second antenna to a change in an indirect reflection, and (c) based on a combination of the change in the direct reflection and of the change in the indirect reflection obtained from the assigned changes of the receiving levels, ascertain a weather-dependent road condition to which the combination of changes has been predefined to correspond.

13. The device as recited in claim 12 , wherein the evaluation circuit is configured to ascertain the weather-dependent road condition by comparing (a) a change that occurs in the first polarization form in the received electromagnetic radiation obtained from the first column of the third antenna to (b) a change that occurs in the second polarization form in the received electromagnetic radiation obtained from the second column of the third antenna.

14. The device as recited in claim 13 , wherein the ascertaining of the weather-dependent road condition includes ascertaining whether a road is wet or dry.

15. The device as recited in claim 1 , wherein the evaluation circuit is configured to detect a characteristic of an object by:
weighting at least one of (a) data of the received electromagnetic radiation provided by the first column of the third antenna and (b) data of the received electromagnetic radiation provided by the second column of the third antenna; and
subsequently comparing (a) the data of the received electromagnetic radiation provided by the first column of the third antenna to (b) the data of the received electromagnetic radiation provided by the second column of the third antenna, as modified by the weighting.

16. The device as recited in claim 1 , wherein the plurality of first antenna receivers are each formed as a respective stub line that extends in one respective direction from the first electrical line, and the plurality of second antenna receivers are patch antennas.

17. The device as recited in claim 1 , wherein the third antenna includes a plurality of the second column surrounding the first column on two sides of the first column.

18. The device as recited in claim 1 , wherein the third antenna includes a plurality of the first column and includes a plurality of the second column surrounding

Assignees

• Bosch Gmbh Robert

Inventors

• Mayer Marcel
• Baur Klaus
• Schoor Michael

Classifications

• G01S13/931

  of land vehicles · CPC title

• G01S7/026

  involving the transmission of elliptically or circularly polarised waves · CPC title

• G01S7/03

  Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver · CPC title

• G01S7/025 Primary

  involving the transmission of linearly polarised waves · CPC title

• H01Q1/3233

  particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems · CPC title