Radar device

• US 20080136702A1
• Filed: 07/20/2007
• Published: 06/12/2008
• Est. Priority Date: 08/10/2006
• Status: Active Grant

• Current Assignee: Fujitsu Ten Limited (DENSO Corporation), Fujitsu Limited
• Original Assignee: Fujitsu Ten Limited (DENSO Corporation), Fujitsu Limited
• Inventors: Shirakawa, Kazuo, Shima, Nobukazu, Tsuchihashi, Masataka
• Granted Patent: US 7,504,988 B2
• Time in Patent Office: Days
• US Class Current: 342/27
• CPC Class Codes: G01S 13/34 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 Class Codes: G01S 13/87 Combinations of radar systems, e.g. primary radar and secondary radar
• CPC Class Codes: G01S 13/931 of land vehicles
• CPC Class Codes: G01S 2013/932 using own vehicle data, e.g. ground speed, steering wheel direction
• CPC Class Codes: G01S 2013/93271 in the front of the vehicles
• CPC Class Codes: G01S 7/03 Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver

Abstract

A radar device has a long range radar sensor having a first transmission and receiving section for transmitting and receiving radio wave to a first detection range and a first signal processing section for detecting an object existing in the first detection range; a short range radar sensor having a second transmission and receiving section for transmitting and receiving a radio wave to a second detection range of which width is wider and of which distance is shorter than the first detection range and a second signal processing section for detecting an object existing in the second detection range; and a processing section for integrating information supplied from the first and second signal processing sections. And one of the long range radar sensor and the short range radar sensor stops a detection operation of the object to an overlapped range of both the detection ranges.

Claims

1. A radar device, comprising:

a long range radar sensor comprising;

a first transmission section for transmitting a radio wave to a first detection range of which center is a predetermined direction;

a first receive section for receiving a reflected wave of the radio wave from the first detection range; and

a first signal processing section for computing a receive signal supplied from the first receive section and detecting an object existing in the first detection range;

a short range radar sensor comprising;

a second transmission section for transmitting a radio wave to a second detection range of which center is the predetermined direction, and of which width is wider and of which distance is shorter than the first detection range;

a second receive section for receiving a reflected wave of the radio wave from the second detection range; and

a second signal processing section for computing a receive signal supplied from the second receive section and detecting an object existing in the second detection range; and

a processing section for integrating information on a detected object supplied from the first and second signal processing sections,

wherein the second transmission section is set so as to stop transmission of the radio wave to an overlapped range included in both the first and second detection ranges.

2. A radar device, comprising:

a long range radar sensor comprising;

a first transmission section for transmitting a radio wave to a first detection range of which center is a predetermined direction;

a first receive section for receiving a reflected wave of the radio wave from the first detection range; and

a first signal processing section for computing a receive signal supplied from the first receive section and detecting an object existing in the first detection range;

a short range radar sensor comprising;

a second transmission section for transmitting a radio wave to a second detection range of which center is the predetermined direction, of which width is wider and of which distance is shorter than the first detection range, and which partially overlaps with the first detection range;

a second receive section for receiving a reflected wave of the radio wave from the second detection range; and

a second signal processing section for computing a receive signal supplied from the second receive section and detecting an object existing in the second detection range; and

a processing section for integrating information on a detected object supplied from the first and second signal processing sections,

wherein one of the first and second signal processing sections stops the computing processing of the receive signal based on a reflected wave from an overlapped range included in both the first and second detection ranges.

3. A radar device, comprising:

a long range radar sensor comprising;

a first transmission section for transmitting a radio wave to a first detection range of which center is a predetermined direction;

a first receive section for receiving a reflected wave of the radio wave from the first detection range; and

a first signal processing section for computing a receive signal supplied from the first receive section and detecting an object existing in the first detection range;

a short range radar sensor comprising;

a second transmission section for transmitting a radio wave to a second detection range of which center is the predetermined direction, of which width is wider and of which distance is shorter than the first detection range, and which partially overlaps with the first detection range;

a second receive section for receiving a reflected wave of the radio wave from the second detection range; and

a second signal processing section for computing a receive signal supplied from the second receive section and detecting an object existing in the second detection range; and

a processing section for integrating information on a detected object supplied from the first and second signal processing sections,

wherein the processing section detects an object using only information supplied from one of the first and second signal processing sections, out of the information on an object detected in the overlapped range included in both the first and second detection ranges.