Detection device and detection method

• US 20070222593A1
• Filed: 03/23/2007
• Published: 09/27/2007
• Est. Priority Date: 03/23/2006
• Status: Active Grant

• Current Assignee: Omron Automotive Electronics Company Limited (Nidec Corporation)
• Original Assignee: Omron Corporation
• Inventors: Satoh, Yasuhiro, Nishiguchi, Tadao, Ishihara, Naoyuki
• Granted Patent: US 7,453,390 B2
• Time in Patent Office: Days
• US Class Current: 340/552
• CPC Class Codes: G01S 13/18 wherein range gates are used
• CPC Class Codes: G01S 7/2923 based on data belonging to a number of consecutive radar periods
• CPC Class Codes: G01S 7/32 Shaping echo pulse signals; Deriving non-pulse signals from echo pulse signals

Abstract

A detection device for detecting a body entering a predetermined range has a transmission means for periodically radiating a pulse-like transmission signal by way of an electromagnetic wave to which a band restriction has been applied, a first reception means and a second reception means, and a judgment means. Each of the reception means performs receiving, as a reception signal, the electromagnetic wave reflected by the body, periodic sampling of the reception signal after a predetermined delay time has elapsed from transmission, and judging, based on a result of the periodic sampling, whether the body exists. The judgment means judges, based on judgment results of each of the first reception means and the second reception means, whether the body has entered into the predetermined range, and outputs a judgment result.

Claims

1. A detection device for detecting a body entering a predetermined range, comprising:

a transmission means for periodically radiating a pulse-like transmission signal by way of an electromagnetic wave to which a band restriction has been applied;

a first reception means and a second reception means, each of which perform;

receiving, as a reception signal, the electromagnetic wave reflected by the body,

periodic sampling of the reception signal after a predetermined delay time has elapsed from transmission, and

judging, based on a result of the periodic sampling, whether the body exists; and

a judgment means for;

judging, based on judgment results of each of the first reception means and the second reception means, whether the body has entered into the predetermined range, and

outputting a judgment result,

wherein the delay time of the second reception means is deviated from the delay time of the first reception means by a half-period of a wave of a main frequency of the transmission signal.

2. A detection device according to claim 1, wherein the delay time of the second reception means is set to be longer than the delay time of the first reception means by the half-period of the wave of the main frequency of the transmission signal.

3. A detection device according to claim 1, wherein:

the predetermined range is a distance from the detection device of less than one meter, and

a shape of the body is variable.

4. A detection method in a detection device, wherein the detection device:

periodically radiates a pulse-like transmission signal by way of an electromagnetic wave to which a band restriction has been applied,

receives, as a reception signal, the electromagnetic wave reflected by a body, and

detects, based on the reception signal, the body that has entered into a predetermined range,

the detection method comprising steps of;

individually performing, in two systems, periodic sampling of the reception signal after a predetermined delay time has elapsed from transmission of the transmission signal and then judging, based on a result of the periodic sampling, whether the body exists, and

judging, based on judgment results of each of the two systems, whether the body has entered into the predetermined range, and outputting a judgment result,

wherein the delay time of one of the two systems is deviated from the delay time of another of the two systems, by a half-period of a wave of a main frequency of the transmission signal.