Signal detection apparatus, vehicle, and method

Patent metadata

Field	Value
Publication number	US-12413605-B2
Application number	US-202318341771-A
Country	US
Kind code	B2
Filing date	Jun 27, 2023
Priority date	Jul 1, 2022
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

A signal detection apparatus includes a signal detection unit which detects signals expected to be input to a communication network in a predetermined cycle, and a determination unit which determines whether detection timing of a second signal detected by the signal detection unit after a first signal which is set as a reference signal for determining an illegal signal is in a predetermined range within which reference timing falls among the signals detected by the signal detection unit, and whether a shift between the detection timing of the second signal and the reference timing is a first threshold or less, in which the determination unit sets the second signal as the reference signal when the shift is the first threshold or less, and sets the first signal as the reference signal without setting the second signal as the reference signal when the shift exceeds the first threshold.

First claim

What is claimed is:

1. A signal detection apparatus comprising:
a signal detection unit which detects signals expected to be input to a communication network in a predetermined cycle; and
a determination unit which determines whether detection timing of a second signal detected by the signal detection unit after a first signal which is set as a reference signal for determining an illegal signal is in a predetermined range within which reference timing that is timing after an integer multiple of the cycle from detection timing of the first signal falls among the signals detected by the signal detection unit, and whether a shift between the detection timing of the second signal and the reference timing is a first threshold or less, wherein
the determination unit
sets the second signal as the reference signal when the shift between the detection timing of the second signal and the reference timing is the first threshold or less,
sets the first signal as the reference signal without setting the second signal as the reference signal when the shift between the detection timing of the second signal and the reference timing exceeds the first threshold,
determines that the detection timing of the second signal is in the predetermined range within which the reference timing falls when the shift between the detection timing of the second signal and the reference timing is a second threshold or less, wherein the first threshold is less than the second threshold,
determines that the second signal is a normal signal when the detection timing of the second signal is in the predetermined range, and
determines that the second signal is not a normal signal when the detection timing of the second signal is not in the predetermined range, and determines whether the second signal is an illegal signal based on information included in the second signal or/and another signal input to the communication network.

2. The signal detection apparatus according to claim 1 , wherein
the determination unit determines that the second signal is not a normal signal when the detection timing of the second signal is not in the predetermined range, and determines whether the second signal is an illegal signal based on information included in the second signal and another signal input to the communication network.

3. The signal detection apparatus according to claim 1 , wherein
the detection timing of the first signal is timing at which the signal detection unit completes reception of the first signal, and the detection timing of the second signal is timing at which the signal detection unit completes reception of the second signal.

4. The signal detection apparatus according to claim 1 , wherein
the communication network is a controller area network (CAN) communication network.

5. The signal detection apparatus according to claim 4 , wherein
the first signal and the second signal are signals including a same CAN ID (Identifier).

6. The signal detection apparatus according to claim 1 , wherein the signal detection apparatus is installed in a vehicle.

7. A method comprising:
detecting signals expected to be input to a communication network in a predetermined cycle;
determining whether detection timing of a second signal detected after a first signal which is set as a reference signal for determining an illegal signal is in a predetermined range within which reference timing that is timing after an integer multiple of the cycle from detection timing of the first signal falls among the signals detected in the detecting, and whether a shift between the detection timing of the second signal and the reference timing is a first threshold or less;
setting the second signal as the reference signal when the shift between the detection timing of the second signal and the reference timing is the first threshold or less; and
setting the first signal as the reference signal without setting the second signal as the reference signal when the shift between the detection timing of the second signal and the reference timing exceeds the first threshold;
determining that the detection timing of the second signal is in the predetermined range within which the reference timing falls when the shift between the detection timing of the second signal and the reference timing is a second threshold or less, wherein the first threshold is less than the second threshold;
determining that the second signal is a normal signal when the detection timing of the second signal is in the predetermined range; and
determining that the second signal is not a normal signal when the detection timing of the second signal is not in the predetermined range, and determining whether the second signal is an illegal signal based on information included in the second signal or/and another signal input to the communication network.

Assignees

• Honda Motor Co Ltd

Inventors

• Saito Daisuke
• Hirono Yuki

Classifications

• H04L63/1483

  service impersonation, e.g. phishing, pharming or web spoofing (detection of rogue wireless access points H04W12/12) · CPC title

• H04L67/12

  specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks · CPC title

• H04L63/1416 Primary

  Event detection, e.g. attack signature detection · CPC title

• H04W12/121 Primary

  Wireless intrusion detection systems [WIDS]; Wireless intrusion prevention systems [WIPS] · CPC title