KR20120000322A - Method controlling frequency modulation continuous wave interference - Google Patents

Method controlling frequency modulation continuous wave interference Download PDF

Info

Publication number
KR20120000322A
KR20120000322A KR1020100060633A KR20100060633A KR20120000322A KR 20120000322 A KR20120000322 A KR 20120000322A KR 1020100060633 A KR1020100060633 A KR 1020100060633A KR 20100060633 A KR20100060633 A KR 20100060633A KR 20120000322 A KR20120000322 A KR 20120000322A
Authority
KR
South Korea
Prior art keywords
interference
signal
fmcw radar
fmcw
radar
Prior art date
Application number
KR1020100060633A
Other languages
Korean (ko)
Inventor
박병권
Original Assignee
현대모비스 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020100060633A priority Critical patent/KR20120000322A/en
Publication of KR20120000322A publication Critical patent/KR20120000322A/en

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
    • G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated 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
    • G01S13/345—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated 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 using triangular modulation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/42—Simultaneous measurement of distance and other co-ordinates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
    • G01S13/56—Discriminating between fixed and moving objects or between objects moving at different speeds for presence detection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The present invention relates to a FMCW interference suppression method, and a method for suppressing interference by a signal of another FMCW radar according to the present invention comprises the steps of determining whether or not interference by another FMCW radar signal according to the magnitude of the received FMCW radar signal And if the interference is determined, shifting the center frequency or channel band of the FMCW radar signal to be transmitted to suppress the interference.

Description

Method controlling frequency modulation Continuous wave interference

The present invention relates to a method for suppressing FMCW interference, and more particularly, to a method of suppressing an influence of an FMCW radar signal used in a vehicle on an FMCW radar signal of another vehicle.

The FMCW radar is a device that can demodulate a frequency and transmit a signal, and when the transmitted signal hits the reflector and receives it, the received signal can be measured to measure the characteristics, size, speed, distance, angle, and the like of the reflector.

These radar devices are mounted on the front and rear sides of the car to provide information required for intelligent systems such as Adaptive Cruise Control (ACC), blind spot detection (BSD), and Lane-Change Assist (LCA). I can do it.

On the other hand, the radar device mounted on the vehicle is limited in the available frequency band, the radar signal transmitted and received from the radar device of each vehicle may affect the other party's radar signal, deriving wrong information from the received radar signal or the other party's radar This can cause problems with jamming the signal.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an FMCW interference suppression method for suppressing interference between radar signals by changing a modulation scheme of a transmission signal in which a frequency using channel is spaced wider than a baseband signal band or changing a spaced distance. Its purpose is to.

In order to achieve the above object, a method of suppressing interference by a signal of another FMCW radar according to an aspect of the present invention comprises the steps of determining whether the interference by the signal of the other FMCW radar signal according to the magnitude of the received FMCW radar signal ; And if the interference is determined, shifting the center frequency or channel band of the FMCW radar signal to be transmitted to suppress the interference.

According to another aspect of the present invention, a method for suppressing interference by a signal of another FMCW radar includes determining whether the interference is caused by a signal of the other FMCW radar according to a magnitude of a received FMCW radar signal; And as a result of the determination, changing the chirping signal used in the FMCW radar to reduce the interference caused by the signal of the other FMCW radar when the interference exists.

According to the present invention, when a large amount of radar is used in a limited frequency band, jamming of a received signal occurs by a signal sent from another radar due to frequency crosstalk, or a ghost image is received by receiving a signal reflected from another signal. This has the effect of preventing you from getting ghost images.

In particular, there is an advantage that can increase the signal accuracy and SNR.

1 is a flowchart illustrating a FMCW interference suppression method according to an embodiment of the present invention.
Figure 2 is a block diagram illustrating an FMCW interference suppression apparatus according to an embodiment of the present invention.
3 and 4 illustrate exemplary interference suppression methods.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is intended to enable a person skilled in the art to readily understand the scope of the invention, and the invention is defined by the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that " comprises, " or "comprising," as used herein, means the presence or absence of one or more other components, steps, operations, and / Do not exclude the addition.

Hereinafter, an FMCW interference suppression method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 is a flowchart illustrating a FMCW interference suppression method according to an embodiment of the present invention, Figure 2 is a block diagram illustrating an FMCW interference suppression apparatus according to an embodiment of the present invention, Figures 3 and 4 Is an illustration for explaining the interference suppression method.

As shown in FIG. 1, an FMCW radar signal is received. The received FMCW radar signal is processed to allow magnitude measurements. That is, the received FMCW radar signal is digitally sampled (S110) and then represented as a frequency spectrum (S120).

According to the magnitude of the received FMCW radar signal, it is determined whether or not interference by another FMCW radar signal. For example, if the magnitude of the received FMCW radar signal is larger or saturated than the predetermined size, if the signal has jammed, or if the noise floor is increased, the other FMCW radar It is determined that the interference by the signal (S130).

As a result of the determination, if there is interference, the center frequency or channel band of the FMCW radar signal to be transmitted is shifted to suppress the interference. That is, hopping the frequency (hopping) (S140). The frequency hopping may be performed through the center frequency hopping tuning unit 210 of the frequency synthesizer of the phase lock loop (PLL) as shown in FIG. 2. For example, when the FMCW radar uses a channel of 77.0001 to 77.002Ghz, when the FMCW radar continuously detects a large frequency component, the signal waveform of the FMCW radar is 77.005 to 77.006Ghz. Can change

Alternatively, a radar may be used to control the chirping signal used in the FMCW radar so that a specific FMCW radar operates only in response to a signal transmitted by the FMCW radar, thereby reducing the possibility of being distorted (interrupted) by a signal transmitted from another FMCW radar. Set differently for each. The change in the chirping signal may be implemented by changing a time period that is modulated, as shown in FIGS. 3 and 4. The time period may be set to correspond to orthogonal codes, and the set code may be applied after being stored in the internal memory of the FMCW radar as the Dwell time vector 220. For example, when a code of a specific FMCW radar is stored in 3ms, 4ms, 4ms, 3ms, 5ms, and 2ms, the code of another FMCW radar may be set and stored in 4ms, 5ms, 3ms, 5ms, 2ms, and 3ms. That is, the code for the chirping signal may be set and stored as a unique code for each FMCW radar, and may be randomly set and stored every time the FMCW radar is initialized. For example, if the code is set to 3ms, 4ms, 4ms, 3ms, 5ms, 2ms and stored in the first initialization, the code may be set to 4ms, 5ms, 3ms, 5ms, 2ms and 3ms in the second initialization.

In this way, when using a large amount of FMCW radar in a limited frequency band, jamming of the received signal occurs due to a signal sent from another FMCW radar due to frequency interference, or a signal reflected from a signal of another FMCW radar It is possible to prevent the ghost image from being acquired and to increase the accuracy and SNR of the received signal.

On the other hand, the FMCW radar can reduce the possibility of overlapping with other FMCW radar signals by dividing the frequency band as much as possible using the frequency division multiplex (FDM) method. For example, in case of 77Ghz, the frequency band allocated to the FMCW radar is 1Ghz, and a frequency band of about 100Khz is required to measure the distance and the speed of 250 meters and 250 km / hr. Therefore, when the frequency separation of 1Mhz through the signal filtering it can minimize the interference by the signal of the other FMCW radar. In the case of 1Mhz separation, 1000 orthogonal frequency bands can be obtained, and thus 1000 signals that do not interfere with each other can be used.

Although the configuration of the present invention has been described in detail with reference to the preferred embodiments and the accompanying drawings, this is only an example, and various modifications are possible within the scope without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

210: center frequency hopping tuning unit
220: Dwell time vector

Claims (5)

In the method for suppressing interference by signals of other FMCW radar,
Determining whether the interference is caused by the signal of the other FMCW radar according to the magnitude of the received FMCW radar signal; And
If the interference is determined, shifting the center frequency or channel band of the FMCW radar signal to be transmitted to suppress the interference;
FMCW interference suppression method comprising a. The method of claim 1,
The determining may include determining that the interference is present when the magnitude of the received FMCW radar signal is larger than the predetermined magnitude or saturated.
FMCW interference suppression method. Determining whether the interference is caused by the signal of the other FMCW radar according to the magnitude of the received FMCW radar signal; And
Changing the chirping signal used in the FMCW radar to reduce the interference caused by the signal of the other FMCW radar when the interference is determined.
FMCW interference suppression method for performing the. The method of claim 3, wherein the step of changing,
Varying the chirped signal by varying a time period that is modulated;
The time period is set to correspond to orthogonal codes to each other,
The set code is stored and applied as a dwell time vector
FMCW interference suppression method. The method of claim 4, wherein
The set code is stored as a unique code for each FMCW radar or randomly set and stored every time the FMCW radar is initialized.
FMCW interference suppression method.
KR1020100060633A 2010-06-25 2010-06-25 Method controlling frequency modulation continuous wave interference KR20120000322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100060633A KR20120000322A (en) 2010-06-25 2010-06-25 Method controlling frequency modulation continuous wave interference

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100060633A KR20120000322A (en) 2010-06-25 2010-06-25 Method controlling frequency modulation continuous wave interference

Publications (1)

Publication Number Publication Date
KR20120000322A true KR20120000322A (en) 2012-01-02

Family

ID=45608221

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100060633A KR20120000322A (en) 2010-06-25 2010-06-25 Method controlling frequency modulation continuous wave interference

Country Status (1)

Country Link
KR (1) KR20120000322A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101868099B1 (en) * 2017-12-18 2018-06-15 엘아이지넥스원 주식회사 Apparatus and method for generating matching signal for detecting laser signal
KR101868100B1 (en) * 2017-12-18 2018-06-15 엘아이지넥스원 주식회사 Apparatus and method for detecting laser signal
WO2019059217A1 (en) * 2017-09-22 2019-03-28 ミツミ電機株式会社 Radar device
CN112154350A (en) * 2019-08-08 2020-12-29 深圳市大疆创新科技有限公司 Signal processing method and system for millimeter wave radar, vehicle and storage medium
JP2022503820A (en) * 2018-10-25 2022-01-12 ホアウェイ・テクノロジーズ・カンパニー・リミテッド Detection method, detection device and system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019059217A1 (en) * 2017-09-22 2019-03-28 ミツミ電機株式会社 Radar device
JP2019056670A (en) * 2017-09-22 2019-04-11 ミツミ電機株式会社 Radar device
KR101868099B1 (en) * 2017-12-18 2018-06-15 엘아이지넥스원 주식회사 Apparatus and method for generating matching signal for detecting laser signal
KR101868100B1 (en) * 2017-12-18 2018-06-15 엘아이지넥스원 주식회사 Apparatus and method for detecting laser signal
JP2022503820A (en) * 2018-10-25 2022-01-12 ホアウェイ・テクノロジーズ・カンパニー・リミテッド Detection method, detection device and system
US11754668B2 (en) 2018-10-25 2023-09-12 Huawei Technologies Co., Ltd. Detection method, detection apparatus, and system
CN112154350A (en) * 2019-08-08 2020-12-29 深圳市大疆创新科技有限公司 Signal processing method and system for millimeter wave radar, vehicle and storage medium
CN112154350B (en) * 2019-08-08 2024-04-30 深圳市大疆创新科技有限公司 Signal processing method, system, vehicle and storage medium of millimeter wave radar

Similar Documents

Publication Publication Date Title
CN111630404B (en) Detection, mitigation and avoidance of mutual interference between automotive radars
CN112327287A (en) Controlling radar transmissions to achieve interference suppression
EP3179266B1 (en) Residue cancellation for automated vehicle mimo radar
US9645230B2 (en) Detection and ranging apparatus
US10359504B2 (en) Apparatus and method for mitigating interference in an automotive radar system
WO2021001504A1 (en) Method for reducing mutual interference in radars
US10386458B2 (en) Radar signal processing device and method
KR101775572B1 (en) Radar system having arrangements and method for decoupling transmission and reception signals and suppression of interference radiation
US7932852B2 (en) RFI suppression in SAR
KR20120000322A (en) Method controlling frequency modulation continuous wave interference
EP3779500A1 (en) Frequency ramp inversion for interference mitigation
CN111190170A (en) Detection method, device and system
CN115932737A (en) Target detection method and corresponding detection device
CN109490889A (en) Trailer-mounted radar and judge the method, apparatus whether trailer-mounted radar is blocked
CN110824431A (en) Radar system and method for operating a radar system
JP6194159B2 (en) Interference compensation support device
CN107209260B (en) Signal processing device, radar device, and signal processing method
JP2007085999A (en) Electric wave interference avoiding device in electric wave transceiver
Alabd et al. Partial chirp modulation technique for chirp sequence based radar communications
CN110494761B (en) Interference mitigation in automotive radar systems by artificial doppler modulation
Ishikawa et al. Packet-based FMCW radar using CSMA technique to avoid narrowband interefrence
JP2015121452A (en) Transmission control device
JP2003255045A (en) On-vehicle radar device
JP7420614B2 (en) Radar device and radar device control method
JP7237080B2 (en) radar

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application