# US 2008/0186223 A1 · Radar Sensor for Motor Vehicles

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- Number: US 2008/0186223 A1
- Document ID: US20080186223A1
- Status: Published application
- Kind: A1
- Application number: 11/663,369
- Filed: 2005-07-11
- Published: 2008-08-07
- Earliest claimed: 2004-09-29
- Assignees: Robert Bosch GmbH
- Inventors: Hermann Mayer; Bernhard Lucas; Joerg Hilsebecher; Joachim Hauk; Paco Haffmans
- Web page: https://patentgrep.com/patent/US20080186223A1

## CPC

- G01S 7/032: {Constructional details for solid-state radar subsystems}
- G01S 7/4004: {of parts of a radar system}
- G01S 13/345: {using triangular modulation}
- G01S 13/584: {adapted for simultaneous range and velocity measurements}
- G01S 13/87: Combinations of radar systems, e.g. primary radar and secondary radar
- G01S 13/931: of land vehicles
- G01S 7/4039: {of sensor or antenna obstruction, e.g. dirt- or ice-coating}
- G01S 13/32: using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S 2013/9325: {for inter-vehicle distance regulation, e.g. navigating in platoons}
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A radar sensor for motor vehicles, including at least one transmitter and receiver device for transmitting and receiving a frequency-modulated radar signal, an analyzer unit for computing the distances and relative velocities of the located objects, and an integrated Doppler radar system for independent measurement of the relative velocities.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim 9

A radar sensor for a motor vehicle, comprising:
at least one transmitter and receiver device for transmitting and receiving a frequency-modulated radar signal;
an analyzer unit for computing distances and relative velocities of located objects; and
an integrated Doppler radar system for independent measurement of the relative velocities.

### Claim 10 (depends on 9)

The radar sensor according to claim 9, wherein a reference oscillator for controlling a frequency of the frequency-modulated radar signal at the same time constitutes an oscillator of the Doppler radar system.

### Claim 11 (depends on 10)

The radar sensor according to claim 10, wherein the frequency-modulated radar signal is in an operating frequency band which corresponds to an integral multiple of the frequency of the reference oscillator.

### Claim 12 (depends on 10)

The radar sensor according to claim 10, wherein the radar sensor is designed to cyclically repeat radar measurements and to generate the frequency-modulated radar signal during each measuring cycle only during part of a period of the measuring cycle, and further comprising a switch to connect the reference oscillator to the transmitter and receiver device for the Doppler radar during a time in which the frequency-modulated radar signal is not generated.

### Claim 13 (depends on 9)

The radar sensor according to claim 9, wherein the transmitter and receiver device includes at least one antenna patch for emitting the frequency-modulated radar signal, and a separate antenna patch is provided for the Doppler radar system.

### Claim 14 (depends on 13)

The radar sensor according to claim 13, wherein the at least one antenna patch for the frequency-modulated radar signal and the separate antenna patch of the Doppler radar system are mounted in front of a common lens.

### Claim 15 (depends on 13)

The radar sensor according to claim 13, further comprising:
at least one mixer for mixing the received signal with the transmitted signal associated respectively with the at least one antenna patch for the frequency-modulated radar signal;
a preamplifier connected to intermediate frequency outputs of the mixer, the preamplifier having as many channels as there are mixers for the frequency-modulated radar signal; and
a further mixer associated with the antenna patch for the Doppler radar system, an intermediate frequency output of the further mixer being connected to one of the channels of the preamplifier.

### Claim 16 (depends on 9)

The radar sensor according to claim 9, wherein the analyzer unit includes a first module for computing the distances and relative velocities of the objects based on the frequency-modulated radar signal, a second module for computing the relative velocities of the objects based on the Doppler radar system, and a comparator module for comparing the relative velocities computed by the first and second modules.