Detection device, detection method, and detection program

Patent metadata

Field	Value
Publication number	US-10288732-B2
Application number	US-201715707459-A
Country	US
Kind code	B2
Filing date	Sep 18, 2017
Priority date	Sep 29, 2016
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A detection device includes: a first correlation circuit that computes correlation of a first wave detection signal, which is a phase-modulated input wave detected at determined frequency, with a determined code sequence for every code composing the determined code sequence, and to generate first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence; and a control circuit that rotates phases of the first correlation signals, generates an added value by adding the phase-rotated first correlation signals, and determines based on the added value whether the phase-modulated input wave is a return wave from a determined object.

First claim

What is claimed is:

1. A detection device, comprising:
a first correlation circuit that computes correlation of a first wave detection signal which is a phase-modulated input wave detected at a determined frequency with a determined code sequence for every code composing the determined code sequence, and generates a plurality of first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence; and
a control circuit that rotates phases of the plurality of first correlation signals, generates an added value by adding the phase-rotated plurality of first correlation signals, and determines based on the added value whether the phase-modulated input wave is a return wave from a determined object, wherein:
the first wave detection signal includes an I signal component and a Q signal component, which are obtained by performing quadrature detection on the phase-modulated input wave,
the first correlation circuit computes correlation of the I signal component of the first wave detection signal and the Q signal component of the first wave detection signal with the determined code sequence for every code composing the determined code sequence, and generates an I signal component of the plurality of first correlation signals and a Q signal component of the plurality of first correlation signals, and
the control circuit includes a phase rotation control circuit which rotates phases of the I signal component of the plurality of first correlation signals and a phase rotation control circuit which rotates phases of the Q signal component of the plurality of first correlation signals, generates an I signal component of the added value by adding the I signal component of the phase-rotated plurality of first correlation signals and a Q component signal of the added value by adding the Q signal component of the phase-rotated plurality of first correlation signals, and the control circuit determines based on the I signal component of the added value and the Q signal component of the added value whether the phase-modulated input wave is the return wave from the determined object.

2. The detection device according to claim 1 , wherein:
the phase-modulated input wave is generated by phase-modulating a carrier wave using the determined code sequence, and
the determined frequency is a frequency of the carrier wave.

3. The detection device according to claim 1 , which is a single-chip integrated circuit.

4. A detection device comprising:
a first correlation circuit that computes correlation of a first wave detection signal which is a phase-modulated input wave detected at a determined frequency with a determined code sequence for every code composing the determined code sequence, and generates a plurality of first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence; and
a control circuit that rotates phases of the plurality of first correlation signals, generates an added value by adding the phase-rotated plurality of first correlation signals, and determines based on the added value whether the phase-modulated input wave is a return wave from a determined object,
wherein the control circuit includes:
a plurality of phase control circuits that rotate phases of the first correlation signals by determined amounts based on a plurality of different amounts of a Doppler shift, and generate added values by adding the phase-rotated first correlation signals,
a plurality of first strength acquisition circuits that are provided corresponding to the plurality of phase control circuits, and, based on the added values generated by the corresponding phase control circuits, derive a plurality of pieces of first strength information indicating strength of the phase-modulated input wave,
a unification circuit that selects one from the plurality of pieces of first strength information, and
a detection circuit that determines whether the phase-modulated input wave is the return wave from the determined object.

5. The detection device according to claim 4 , wherein
the determined amounts based on the amounts of the Doppler shift are any one of 0°, 90°, 180°, or 270°.

6. A detection device comprising:
a first correlation circuit that computes correlation of a first wave detection signal which is a phase-modulated input wave detected at a determined frequency with a determined code sequence for every code composing the determined code sequence, and generates a plurality of first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence;
a control circuit that rotates phases of the plurality of first correlation signals, generates an added value by adding the phase-rotated plurality of first correlation signals, and determines based on the added value whether the phase-modulated input wave is a return wave from a determined object;
a second wave detection circuit that detects, by a signal of a frequency different from that of a carrier wave, an input wave from outside of the detection device and generates a second wave detection signal which detects the input wave; and
a second correlation circuit that computes correlation of the second wave detection signal with the determined code sequence for every code composing the code sequence and generates a single second correlation signal,
wherein the control circuit includes a detection circuit that determines based on the added value and the second correlation signal whether the determined object is present within a detection area of the detection device.

7. A detection method performed by a detection device, comprising:
computing, by the detection device, correlation of a first wave detection signal, which is a phase-modulated input wave detected at a determined frequency, with a determined code sequence for every code composing the determined code sequence;
generating, by the detection device, a plurality of first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence;
rotating, by the detection device, phases of the plurality of first correlation signals;
generating, by the detection device, an added value by adding the phase-rotated plurality of first correlation signals; and
determining, by the detection device, based on the added value whether the phase-modulated input wave is a return wave from a determined object, wherein:
the first wave detection signal includes an I signal component and a Q signal component, which are obtained by performing quadrature detection on the phase-modulated input wave,
the computing of the correlation of the first wave detection signal includes computing correlation of the I signal component of the first wave detection signal and the Q signal component of the first wave detection signal with the determined code sequence for every code composing the determined code sequence, and generating an I signal component of the plurality of first correlation signals and a Q signal component of the plurality of first correlation signals,
the rotating of the phases of the plurality of first correlation signals includes rotating phases of the I signal component of the plurality of first correlation signals and rotating phases of the Q signal component of the plurality of first correlation signals, and generating an I signal component of the added value by adding the I signal component of the phase-rotated plurality of first correlation signals and a Q component signal of the added value by adding the Q signal component of the phase-rotated plurality of first correlation signals, and
the determining of whether the phase-modulated input wave is the

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Morita Tadashi
• Hashimoto Masahiko

Classifications

• G01S13/325

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• G01S15/04

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• G01S2013/9324

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• G01S2013/9323

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• G01S13/584

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