阅读说明：本技术 雷达装置和异常判定程序 (Radar device and abnormality determination program ) 是由 铃木大辅 梨本翔永 于 2018-01-17 设计创作，主要内容包括：雷达(30)是FMCW方式的雷达。雷达(30)的判定部(901)执行判定差拍信号(S305)是否存在异常衰减的衰减判定程序(324a)、和判定差拍信号(S305)的频率特性是否存在异常的频率特性判定程序(325a)中的至少任意一个程序。在雷达(30)中,通过衰减判定程序(324a)和频率特性判定程序(325a)的执行,能够通过软件来判定差拍信号(S305)是否异常。(The radar (30) is an FMCW radar. A determination unit (901) of a radar (30) executes at least one of an attenuation determination program (324a) for determining whether or not an abnormal attenuation is present in a beat signal (S305), and a frequency characteristic determination program (325a) for determining whether or not an abnormality is present in the frequency characteristic of the beat signal (S305). In the radar (30), whether or not the beat signal (S305) is abnormal can be determined by software by executing the attenuation determination program (324a) and the frequency characteristic determination program (325 a).)

1. A radar apparatus includes:

a random number generation unit that generates a random number sequence of 1 bit or more;

a local signal generation unit that generates a local signal from a bit value of each bit of the random number sequence;

a transmission unit that generates a transmission signal by frequency-modulating a carrier wave with the local signal and transmits the transmission signal;

a mixer that acquires the transmission signal from the transmission unit, mixes the transmission signal with a reception signal received by a reception antenna, and outputs a mixer output signal;

a beat signal generation unit that generates a beat signal from the mixer output signal output from the mixer; and

and a determination unit that determines whether or not the beat signal is abnormal by executing at least one of an attenuation determination program that determines whether or not the beat signal has abnormal attenuation and a frequency characteristic determination program that determines whether or not the frequency characteristic of the beat signal has abnormality.

2. The radar apparatus of claim 1,

the judgment section executes the attenuation judgment routine,

the attenuation determination program calculates a signal intensity value indicating a signal intensity of the beat signal, and determines whether or not there is an abnormal attenuation in the beat signal by comparing the calculated signal intensity value with a signal intensity threshold value.

3. The radar apparatus of claim 1,

the determination section executes the frequency characteristic determination routine,

the frequency characteristic determination program determines whether or not there is an abnormality in the frequency characteristic of the beat signal, using a result of performing a fast fourier transform on the beat signal.

4. The radar apparatus according to any one of claims 1 to 3,

the determination unit determines whether or not the beat signal is abnormal for each frame of the beat signal,

the radar device further includes a calculation unit that calculates measurement information including at least one of a distance to a measurement target and a speed of the measurement target based on the beat signal,

the calculation unit excludes the frame determined to be abnormal by the determination unit from the calculation of the measurement information.

5. The radar apparatus according to any one of claims 1 to 4,

when generating a random number sequence of a plurality of bits, the random number generation unit adjusts the frequency of occurrence of 0 and 1.

6. An abnormality determination program that causes a computer to execute:

random number generation processing of generating a random number sequence of 1 bit or more;

local signal generation processing for generating a local signal according to the bit value of each bit of the random number sequence; and

and a determination process of executing at least one of an attenuation determination program for determining whether or not there is an abnormal attenuation in a beat signal obtained by passing a mixed signal obtained by mixing a transmission signal obtained by frequency-modulating a carrier wave with the local signal and a reception signal received by a reception antenna through a low-pass filter and a frequency characteristic determination program for determining whether or not there is an abnormality in a frequency characteristic of the beat signal.

7. The abnormality determination program according to claim 6,

the determination process executes the attenuation determination program,

the attenuation determination program calculates a signal intensity value indicating a signal intensity of the beat signal, and determines whether or not there is an abnormal attenuation in the beat signal by comparing the calculated signal intensity value with a signal intensity threshold value.

8. The abnormality determination program according to claim 6,

the determination process executes the frequency characteristic determination program,

the frequency characteristic determination program determines whether or not there is an abnormality in the frequency characteristic of the beat signal, using a result of performing a fast fourier transform on the beat signal.

9. The abnormality determination program according to any one of claims 6 to 8,

the determination process determines whether the beat signal is abnormal or not for each frame of the beat signal,

the abnormality determination program further includes a calculation process of calculating measurement information including at least one of a distance to a measurement target and a speed of the measurement target based on the beat signal,

in the calculation process, the frame determined to be abnormal by the determination process is excluded from the calculation of the measurement information.

10. The abnormality determination program according to any one of claims 6 to 9,

in the random number generation process, when a random number sequence of a plurality of bits is generated, the occurrence frequencies of 0 and 1 are adjusted.

Technical Field

The present invention relates to a radar apparatus using a frequency-modulated continuous wave.

Background

The radar is a device that irradiates a radio wave to an object and measures a reflected wave to measure a relative distance between the radar and the object or a relative speed of the object. The FMCW (Frequency Modulated Continuous Wave) system is one of radar systems, and is inexpensive and has excellent distance and speed measurement capabilities.

In radar, spoofing becomes a threat. Spoofing is an attack in which a radio wave masquerading as a reflected wave to a radar is inserted from the outside to make a measurement value erroneous. Non-patent document 1 discloses a countermeasure method for modulating chirp (chirp) of an FMCW radar as a countermeasure against spoofing.

Disclosure of Invention

Problems to be solved by the invention

The FMCW radar having spoofing measures disclosed in non-patent document 1 uses hardware such as a time/frequency filter and a detector, which is not used as hardware of a general FMCW radar, in order to determine whether or not there is an attack.

Therefore, in the radar of non-patent document 1, it is not possible to perform fraud countermeasures without changing the hardware of the normal FMCW radar.

An object of the present invention is to provide an FMCM radar capable of performing fraud countermeasures without changing the hardware configuration of an existing FMCW radar.

Means for solving the problems

The radar device of the present invention includes:

a random number generation unit that generates a random number sequence of 1 bit or more;

a local signal generation unit that generates a local signal from a bit value of each bit of the random number sequence;

a transmission unit that generates a transmission signal by frequency-modulating a carrier wave with the local signal and transmits the transmission signal;

a mixer that acquires the transmission signal from the transmission unit, mixes the transmission signal with a reception signal received by a reception antenna, and outputs a mixer output signal;

a beat signal generation unit that generates a beat signal from the mixer output signal output from the mixer; and

and a determination unit that determines whether or not the beat signal is abnormal by executing at least one of an attenuation determination program that determines whether or not the beat signal is abnormally attenuated and a frequency characteristic determination program that determines whether or not the frequency characteristic of the beat signal is abnormal.

Effects of the invention

According to the radar apparatus of the present invention, it is possible to provide an FMCM radar capable of performing fraud countermeasures without changing the hardware configuration of an existing FMCW radar.

Drawings

Fig. 1 is a diagram of embodiment 1, and is a hardware configuration diagram of a radar 10.

Fig. 2 is a diagram of embodiment 1, and is a diagram showing a configuration of a computer 100 of the radar 10.

Fig. 3 is a diagram of embodiment 1, and is a diagram showing a hardware configuration of the radar 30.

Fig. 4 is a diagram of embodiment 1, and is a diagram showing an internal configuration of a computer 300 of the radar 30.

Fig. 5 is a diagram of embodiment 1, and is a sequence diagram showing the operation of the radar 30.

Fig. 6 is a diagram of embodiment 1, and is a diagram illustrating frequency modulation of transmission signal S302.

Fig. 7 is a diagram of embodiment 1, and shows input and output states of the computer 300.

Fig. 8 is a diagram of embodiment 1, and is a diagram showing a change in frequency of the received signal S303 according to presence or absence of an attack.

Fig. 9 is a diagram of embodiment 1, and shows abnormality determination of the beat (beat) signal S305 by the attenuation detecting unit 324.

Fig. 10 is a diagram of embodiment 1, and shows abnormality determination of the beat signal S305 by the abnormal frequency detection unit 325.

Detailed Description