WO2024024007A1 - レーダ装置およびレーダ信号処理方法 - Google Patents
レーダ装置およびレーダ信号処理方法 Download PDFInfo
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- WO2024024007A1 WO2024024007A1 PCT/JP2022/029061 JP2022029061W WO2024024007A1 WO 2024024007 A1 WO2024024007 A1 WO 2024024007A1 JP 2022029061 W JP2022029061 W JP 2022029061W WO 2024024007 A1 WO2024024007 A1 WO 2024024007A1
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- WIPO (PCT)
- Prior art keywords
- radar device
- vehicle
- unit
- axis deviation
- radar
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- Legal status (The legal status 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 status listed.)
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Classifications
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- 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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- 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
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4026—Antenna boresight
Definitions
- the present invention relates to a radar device and a radar signal processing method.
- a radar device is a device that radiates high-frequency electromagnetic waves, typically millimeter waves, into the surroundings, receives electromagnetic waves reflected from a target object, and processes the signals to obtain position and velocity information of the target object. By using this information, it is possible to construct a radar device that calculates the risk of collision between the target object and the own vehicle and issues a warning.
- a camera device which is one type of sensing device, requires ambient light or auxiliary light, but since a radar device uses electromagnetic waves, it is possible to detect a target object only with the radar device. Because of this feature, it is particularly suitable for the radar device to be mounted on the end of the vehicle or the side of the vehicle.
- radar devices are attached to the ends of vehicles, etc., and are devices that obtain information on the position and speed of detected targets.
- the installation axis is misaligned, the accuracy of the target object information decreases.
- the collision risk calculation becomes inaccurate, problems such as the alarm activation timing are delayed, the alarm is not activated (Non-alert), and unnecessary activation (Unnecessary alert) occur. For this reason, there is a need to establish a method for detecting axis deviation of radar equipment.
- Patent Document 1 describes a radar device that is attached to the own vehicle so that at least a portion of the own vehicle body falls within the detection range.
- the radar device described in Patent Document 1 sets a position where a detected part of the own vehicle extends as a reference position, and when a surrounding object is detected, the direction of existence of the object is determined by an axis deviation from the reference position. It is detected as an angle.
- Patent Document 1 sets a part of the own vehicle as the reference position, when the radar device is attached to a movable part of the own vehicle, depending on the moving state, a part of the own vehicle may be set as the reference position. It is difficult to include it within the detection range, and axis deviation cannot be determined because the reference position is lost. Furthermore, if a part of your vehicle is included in the detection range, if there are detection objects near your vehicle, they may be judged as one target at the same time, making it difficult to detect the reference position. It deviates from its original position. Therefore, the reference position cannot be detected with high accuracy, and stable axis deviation detection cannot be provided. Another concern is that detecting a part of the own vehicle may cause multipath, which may cause unnecessary activation of an alarm.
- the present application includes a plurality of means for solving the above problems, and one example is a radar device installed in a vehicle that transmits transmission waves to the surroundings and receives reflected waves reflected by objects.
- a transmission/reception unit a detection processing unit that detects an object based on a received signal of the transmission/reception unit; an information acquisition unit that acquires yaw rate information of the vehicle;
- the apparatus includes an axis deviation determination unit that determines the circumferential velocity caused by the position change and compares the circumferential velocity with yaw rate information to determine the axis deviation of the transmitter/receiver unit.
- FIG. 1 is a block diagram showing a radar device and a control device according to a first embodiment of the present invention.
- FIG. 3 is a diagram showing folding, unfolding, and stopped states of a mechanism section in which a radar device according to a first embodiment of the present invention is mounted.
- FIG. 3 is a diagram showing the behavior of a target while the radar device according to the first embodiment of the present invention is in an unfolding operation from a folded state.
- 1 is a block diagram showing an example of a hardware configuration of a computer included in a radar device according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing a flowchart of a target object state and axis deviation determination when a vehicle equipped with a radar device according to a first embodiment of the present invention is traveling in a straight line.
- FIG. 3 is a diagram illustrating a target object state and a flowchart of axis deviation determination when a vehicle equipped with a radar device according to a first embodiment of the present invention is retracted while traveling in a straight line.
- FIG. 2 is a diagram showing a target object state when a vehicle equipped with a radar device according to a first embodiment of the present invention is stopped, and a flowchart of axis deviation determination.
- FIG. 3 is a diagram illustrating a target object state and a flowchart of axis deviation determination when a vehicle equipped with a radar device according to a first embodiment of the present invention is retracted while traveling in a straight line.
- FIG. 2 is a diagram showing a target object state when a vehicle equipped with a radar device according to a first
- FIG. 3 is a diagram showing a target object state and a flowchart of axis deviation determination when a retraction operation is performed while a vehicle equipped with a radar device according to a first embodiment of the present invention is stopped.
- FIG. 3 is a diagram showing a flowchart of a target object state and axis deviation determination when a vehicle equipped with a radar device according to a first embodiment of the present invention is traveling on a curve;
- FIG. 3 is a diagram illustrating a target object state and a flowchart of axis deviation determination when the vehicle equipped with the radar device according to the first embodiment of the present invention performs a storage operation while traveling on a curve.
- FIG. 3 is a diagram showing a target object state and a flowchart of axis deviation determination when a retraction operation is performed while a vehicle equipped with a radar device according to a first embodiment of the present invention is stopped.
- FIG. 3 is a diagram showing a flowchart of a target object state and axis deviation
- FIG. 3 is a diagram showing the behavior of a target when peripheral velocity is developed in the radar device according to the first embodiment of the present invention.
- FIG. 2 is a diagram defining each velocity vector constituting a target velocity, for explaining the first embodiment of the present invention.
- FIG. 2 is a block diagram showing a modification of the radar device and control device according to the first embodiment of the present invention. It is a block diagram showing the modification of the radar device and control device concerning the example of the 2nd embodiment of the present invention.
- FIG. 7 is a block diagram showing a modification of the radar device and control device according to the third embodiment of the present invention.
- FIG. 7 is a block diagram showing a modification of the radar device and control device according to the fourth embodiment of the present invention. It is a block diagram showing a modification of a radar device and a control device concerning a 5th example of embodiment of the present invention.
- FIG. 1 is a diagram showing the configuration of a radar device 1 and a control device 7 according to this embodiment.
- the radar device 1 of this embodiment is attached to a vehicle movable portion 5 on the front left or right side of a vehicle (truck) shown in FIG. 3, which will be described later.
- the vehicle movable part 5 is configured as a door mirror stay to which a door mirror for the driver to check the side is attached. Therefore, the radar device 1 and the door mirrors attached to the vehicle movable section 5 move in conjunction with the movement of the vehicle movable section 5.
- An example of the movable state of the radar device 1 will be described later with reference to FIG.
- the vehicle movable section 5 has a built-in motor 6 that moves the vehicle movable section 5 itself between a folded state (storage state) and an unfolded state.
- the control device 7 controls the motor 6, acquires information from the radar device 1, and performs warnings, vehicle control, and the like.
- the radar device 1 includes a transmitting/receiving section 13 , a detection processing section 14 , an information acquisition section 16 , an alarm section 39 , an information transmitting section 40 , and a power supply section 47 .
- the transmitting/receiving unit 13 performs processing for transmitting and receiving high frequency signals. That is, a high frequency signal generated by an oscillator inside the transmitting/receiving section 13 and amplified by a transmitting amplifier is radiated into space from the transmitting antenna 27 via the radome 35 as a transmitting wave 29 in the millimeter wave band.
- the transmitted wave 29 is reflected by an object 12 within the detection range, such as a pedestrian, bicycle, motorcycle, car, truck, or bus, and becomes a received wave 30.
- the received wave 30 propagates through space, it is received again by the receiving antenna 28 via the radome 35.
- the signal received by the receiving antenna 28 is amplified by a receiving amplifier in the transmitting/receiving section 13, and mixed with a high frequency signal from an oscillator by a mixer to generate an intermediate frequency (IF) signal.
- the IF signal is converted into a digital signal by an analog/digital converter in the transmitter/receiver 13, and then passed to the detection processor 14 using the digital signal as a reception signal.
- the detection processing unit 14 performs two-dimensional fast Fourier transform (FFT) processing, angle estimation, grouping processing, and tracking processing. Further, the detection processing unit 14 receives information acquired from the vehicle sensor 9 from the vehicle information processing unit 10 of the control device 7 via the information acquisition unit 16 as vehicle information 11. The information acquisition unit 16 performs information acquisition processing to acquire vehicle information 11.
- FFT fast Fourier transform
- the detection processing section 14 sends target object information 32 and vehicle information 11 obtained through the detection processing to the alarm section 39.
- a vehicle information processing unit 10 of the control device 7 generates vehicle information 11 based on a vehicle sensor 9 mounted on the vehicle.
- the vehicle information 11 here includes yaw rate information indicating the rotation of the vehicle, information indicating whether the vehicle is running or stopped, and the like.
- the warning unit 39 calculates objects 12 that have a possibility of colliding with the own vehicle 2 based on the target object information 32 and the vehicle information 11, and obtains the warning information 31 based on the calculation.
- the alarm information 31 obtained by the alarm section 39 is supplied to the information transmitting section 40 .
- the detection processing section 14 supplies the target object information 32 to the information transmission section 40 .
- the information transmitter 40 transmits the warning information 31 and target information 32 to the vehicle information receiver 42 of the control device 7.
- the control device 7 uses a user interface (not shown) including a display device, a speaker, etc. to notify the driver of an object approach warning.
- the motor 6 is a drive unit that moves the vehicle movable unit 5, which is a door mirror stay to which a door mirror is attached, between a folded state (stored state) and an expanded state.
- FIG. 2 shows an example in which the vehicle movable portion 5 is movable between a folded state and an unfolded state.
- FIG. 2 is a view of the vehicle 2 viewed from directly above, and the upper side of FIG. 2 is the driver's seat.
- the vehicle movable part 5 which is a door mirror stay, is attached to the left front of the vehicle 2, which is a truck.
- FIG. 2 shows an example in which it is attached to the left front, it may also be attached to the right front.
- the radar devices 1a, 1b, and 1c at the respective positions shown in FIG. 2 have a field of view (FoV) 4, which is a detection range, formed in a fan shape.
- FoV field of view
- the vehicle movable section 5 shown in FIG. 2 is driven by a motor 6 to rotate.
- the radar device 1 attached to the vehicle movable part 5 changes its mounting position from the radar device (unfolded) 1a to the radar device (folded) 1b by the operation of the motor 6 based on the operation of the electric storage switch 8. Change.
- an axis misalignment occurs in the radar device 1.
- the radar device (unfolded) 1a ⁇ radar device (folded) 1b is in operation, if the stop operation is performed using the electric storage switch 8, the radar device (stopped) 1c will be in an intermediate position. Can be done.
- FIG. 3 visually shows the behavior of a target detected by the radar device 1 while the vehicle movable portion 5 is unfolding from the folded state.
- the mounting position changes from the radar device (unfolded) 1a to the radar device (folded) 1b due to the operation of the motor 6.
- a circumferential velocity 18 corresponding to the rotational component of the vehicle movable part 5 appears, and a target velocity (with a rotational component) 37b on which the circumferential velocity 18 is superimposed is generated.
- the axis deviation is detected by checking whether the vehicle running state or the motor 6 causes the circumferential speed 18 superimposed on the target object speed 37b.
- the yaw rate information 17 of the vehicle information 11 (see FIG. 13) It can be confirmed using Axis deviation detection in this embodiment can be performed, for example, by the detection processing section 14 of the radar device 1.
- the detection processing unit 14 of the radar device 1 is equipped with, for example, a computer that performs arithmetic processing, and can perform axis deviation detection processing.
- FIG. 4 shows an example of the hardware configuration of a computer installed in the radar device 1, which performs axis deviation detection processing and the like inside the radar device 1.
- the computer installed in the radar device 1 includes a CPU (Central Processing Unit) 101 which is a processor, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, and a non-volatile storage 104. Be prepared.
- the nonvolatile storage 104 for example, a flash memory or an EEPROM (Electrically Erasable and Programmable Read Only Memory) is used. Alternatively, an HDD (Hard Disk Drive) or SSD (Solid State Drive) may be used.
- the computer installed in the radar device 1 includes a network interface 105, an input device 106, and an output device 107.
- the CPU 101 causes the RAM 103 to execute a program stored in the ROM 102 or the nonvolatile storage 104, thereby causing the RAM 103 to configure at least part of the functions performed by the detection processing unit 14 (FIG. 1).
- the nonvolatile storage 104 stores programs for performing object detection processing, axis deviation detection processing, etc. as the radar device 1, and also stores vehicle information 11 and the like.
- the network interface 105 has a function of transmitting and receiving data to and from the control device 7 .
- the input device 106 receives input of received signals from the transmitting/receiving section 13 and the like.
- the output device 107 outputs a signal to the alarm unit 39 and the like.
- FIGS. 5 and 6 are when the vehicle 2 is traveling in a straight line
- FIGS. 7 and 8 are when the vehicle 2 is stopped
- FIGS. 9 and 10 are when the vehicle 2 is traveling on a curve. It is.
- the left side of each figure shows the position or movement of the vehicle movable part 5 from above the vehicle 2, and the right side of each figure shows a flowchart for performing axis deviation determination processing.
- step S11 it is determined whether or not there is (step S11). If there is no rotational component in step S11 (NO in step S11), the detection processing unit 14 determines that the vehicle is traveling in a straight line or stopped, and ends the axis deviation detection process. Further, if there is a rotational component in step S11 (YES in step S11), the detection processing unit 14 determines whether or not the rotational component is approximately equal to the yaw rate obtained from the vehicle information (step 12).
- step S12 If the rotational component is approximately equal to the yaw rate in step S12 (YES in step S12), it is determined that the own vehicle is traveling on a curve (step 13), and the axis deviation detection process is ended. Further, if the rotational component is not equal to the yaw rate in step S12 (NO in step S12), the detection processing unit 14 determines that axis deviation has occurred because the motor 6 is operating (step S14), Ends the axis deviation detection process.
- step S11 of the flowchart for performing this axis deviation determination process the rotational components of a plurality of targets are detected, since it is assumed that the detected target itself may move with a rotational component. It is from. Normally, all of the targets detected by the radar device do not move with a rotational component, so by assuming that a plurality of targets are detected, the determination based on this flowchart can be performed appropriately. However, the case where multiple targets are detected is just one example, and one target may be detected and the determination may be made based on the rotational component of that one target.
- FIG. 5 shows a case where the vehicle 2 is traveling in a straight line traveling direction 201.
- each target object 36 detected by the radar device 1 does not exhibit the circumferential velocity 18, and a target velocity 37a without a rotational component is detected. Therefore, in the process of the flowchart for axis deviation determination in the detection processing unit 14, the determination of "a plurality of targets have rotational components" in step S11 is NO.
- FIG. 6 shows an example in which the vehicle movable portion 5 is moved by the motor 6 in a situation where the vehicle 2 is traveling in a straight line traveling direction 201.
- FIG. 7 shows a case where the vehicle 2 is stopped.
- the circumferential velocity of the target object 36 is not expressed as in the case of straight-line traveling, and a target velocity 37a without a rotational component is generated. Therefore, in the process of the flowchart for axis deviation determination in the detection processing unit 14, the determination of "a plurality of targets have rotational components" in step S11 is NO.
- FIG. 8 shows an example in which the vehicle movable portion 5 is moved by the motor 6 while the vehicle 2 is stopped.
- FIG. 9 shows a case where the vehicle 2 is traveling in a curved direction 202.
- FIG. 10 shows an example in which the vehicle movable portion 5 is moved by the motor 6 while the vehicle 2 is traveling in a curved direction 202.
- FIG. 11 When traveling on a curve, two types of circumferential speeds occur depending on the vehicle traveling state and the operation of the motor 6. The behavior of the target at that time will be explained using FIG. 11.
- a circumferential velocity (Y) 19 corresponding to R 2 is expressed as ⁇ 2 ⁇ R 2 in the tangential direction of a circle whose radius is the distance R 2 .
- the circumferential velocity (M) 20 corresponding to the angular velocity ⁇ 1 and the distance R 1 from the center m 0 of the motor 6 is ⁇ 1 ⁇ R 1 , and a circle with the distance R 1 as the radius is Expresses tangentially.
- FIG. 12 shows the definition of each velocity vector that constitutes the target velocity.
- Actual target speed 304 is found by combining vectors of own vehicle speed 303, relative speed 305, peripheral speed (Y) 301, and peripheral speed (M) 302. That is, the following relational expression is obtained.
- Target speed own vehicle speed + relative speed + peripheral speed (Y) + peripheral speed (M)
- processing related to this axis deviation determination is performed by the detection processing unit 14 in the radar device 1.
- the radar device 1 may be provided with a processing unit that determines the presence or absence of axis deviation, and the determination by that processing unit may be performed. The results may be sent to the control device 7 to perform corresponding control.
- the radar device 1 shown in FIG. 13 has a configuration in which the radar device 1 shown in FIG. 1 is provided with a determination section 15.
- the determination unit 15 acquires the circumferential velocity included in the plurality of target object information and the yaw rate information 17 included in the vehicle information from the detection processing unit 14, and compares the circumferential velocity and the yaw rate. Thereby, the determining unit 15 performs a process of determining whether there is an axis deviation. This process of determining the presence or absence of axis deviation is performed according to the flowcharts shown in FIGS. 5 to 10.
- the determination result in the determination section 15 is supplied to the alarm section 39 and also to the control device 7.
- the alarm unit 39 generates alarm information when there is an axis deviation and transmits it to the control device 7.
- the control device 7 takes measures such as stopping vehicle control based on the target detected by the radar device 1 or reducing the traveling speed to a safe speed. I do.
- the other configurations of the radar device 1 and the control device 7 shown in FIG. 13 are configured similarly to the radar device 1 and the control device 7 shown in FIG.
- FIG. 14 the same components as those in FIGS. 1 to 13 described in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- FIG. 14 is a diagram showing the configuration of the radar device 1 and the control device 7 of this embodiment.
- the radar device 1 according to the present embodiment includes a determination unit 15 similarly to the radar device 1 shown in FIG.
- the determination unit 15 acquires the circumferential velocity included in the plurality of target object information and the yaw rate information 17 included in the vehicle information from the detection processing unit 14, compares the circumferential velocity and the yaw rate, and determines the presence or absence of axis deviation. Perform processing. This process of determining the presence or absence of axis deviation is performed according to the flowcharts shown in FIGS. 5 to 10.
- the judgment section 15 supplies an alarm suppression signal 41 to the alarm section 39 .
- the alarm section 39 receives the alarm suppression signal 41, it limits the output of the alarm information 31. That is, when the alarm suppression signal 41 is issued, the alarm section 39 performs a process of suppressing the radar alarm function.
- the other configurations of the radar device 1 and the control device 7 shown in FIG. 14 are configured similarly to the radar device 1 and the control device 7 shown in FIG. As a result, according to the second embodiment of the present invention, it is possible to obtain the effect of suppressing the occurrence of unnecessary operations in a state of axis misalignment.
- FIG. 15 a third embodiment of the present invention will be described with reference to FIG. 15.
- the same components as those in FIGS. 1 to 14 described in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.
- FIG. 15 is a diagram showing the configuration of the radar device 1 and the control device 7 of this embodiment.
- the radar device 1 of this embodiment like the radar device 1 shown in FIG. 14, includes a determination unit 15 and a storage unit 21 that stores the axis deviation result 24 in the determination unit 15. It is preferable that the storage section 21 is composed of a nonvolatile storage element.
- the other configurations of the radar device 1 and the control device 7 shown in FIG. 15 are configured similarly to the radar device 1 and the control device 7 shown in FIG. 14.
- the determination section 15 sends the alarm suppression signal 41 to the alarm section 39 as in the example of FIG. 14, but as shown in FIG.
- a storage section 21 may be provided.
- FIG. 16 the same components as those in FIGS. 1 to 15 described in the first to third embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.
- FIG. 16 is a diagram showing the configuration of the radar device 1 and the control device 7 of this embodiment.
- the radar device 1 according to the present embodiment includes a determination unit 15 similarly to the radar device 1 shown in FIG.
- the determination unit 15 obtains the circumferential velocity included in the plurality of target object information and the yaw rate information 17 included in the vehicle information from the detection processing unit 14, compares the circumferential velocity and the yaw rate, and obtains the axis deviation result 24. .
- the axis deviation result 24 outputted by the determination unit 15 is supplied to the integration unit 33 and integrated.
- the integrating unit 33 calculates the actual amount of axis deviation 46 by integrating the preset axis deviation confirmation period and the result of the angular velocity (M).
- the calculated actual axis deviation amount 46 is stored in the storage unit 21. It is preferable that this storage section 21 is also composed of a nonvolatile storage element.
- the other configurations of the radar device 1 and the control device 7 shown in FIG. 16 are configured similarly to the radar device 1 and the control device 7 shown in FIG. 15.
- FIG. 17 the same components as those in FIGS. 1 to 16 described in the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.
- FIG. 17 is a diagram showing the configuration of the radar device 1 and the control device 7 of this embodiment.
- the radar device 1 of this embodiment includes a determination section 15, an integration section 33, and a storage section 21, like the radar device 1 shown in FIG.
- the configuration is the same as that of FIG. 16 in that the integration unit 33 integrates the axis deviation results 24 output by the determination unit 15 and stores the actual axis deviation amount 46 obtained by the integration in the storage unit 21. .
- the radar device 1 shown in FIG. 17 includes a motor control section 48.
- the motor control unit 48 sends a deployment command 49 to the control device 7 within a predetermined time.
- the deployment signal output section 7b supplies the deployment signal 44 to the motor 6.
- the other configurations of the radar device 1 and the control device 7 shown in FIG. 17 are configured similarly to the radar device 1 and the control device 7 shown in FIG. 16.
- the actual accurate position can be determined in the subsequent calculation of the amount of axis deviation. This has the effect of being able to derive the amount of axis deviation.
- the vehicle movable part 5 is provided on the left side of the host vehicle 2, and the direction of axis deviation is explained using the condition that the radar device (unfolded) 1a ⁇ the radar device (folded) 1b.
- the vehicle movable part 5 may be located on the right side of the own vehicle 2, or the direction may be reversed from the radar device (folded) 1b to the radar device (unfolded) 1a. In this case, although the direction of axis deviation shown in FIG. 4 etc. is reversed, the same effect is obtained.
- the rotational components of a plurality of targets are detected and it is determined whether each rotational component substantially matches the yaw rate. Judging from multiple targets in this way increases the accuracy of axis misalignment judgment, but the principle of axis misalignment judgment is to detect the rotational component of one target, and that one rotational component is determined by the yaw rate. It is also possible to determine axis misalignment by determining whether the values approximately match. Further, by determining the axis deviation based on one rotational component, the processing of the present invention can be applied even when there are few targets detected by the radar device 1 around the vehicle.
- the radar device 1 is attached to the door mirror stay, which is a movable part of the vehicle 2.
- the radar device 1 is attached to the door mirror stay as an example, and the radar device 1 is attached to other movable parts of the vehicle.
- the axis deviation of the radar device may be determined.
- information on the electric retractable switch 8 that starts the motor 6 can be obtained to determine each situation that occurs in conjunction with the operation of the door mirror stay to which the radar device 1 is attached. Therefore, the operation of the radar device 1 attached to a movable part such as a door mirror stay can be appropriately controlled, and false detection can be prevented.
- the axis misalignment is determined within the radar device, but based on information from the radar device, the axis misalignment is determined in the control device and corresponding control is performed. It's okay.
- the detection processing unit 14 and the like in the radar device 1 are configured by a computer executed under the control of a CPU, but some or all of the functions performed by the radar device can be implemented using an FPGA. It may also be realized by dedicated hardware such as a Field Programmable Gate Array (Field Programmable Gate Array) or an Application Specific Integrated Circuit (ASIC).
- FPGA Field Programmable Gate Array
- ASIC Application Specific Integrated Circuit
- information such as programs, tables, files, etc. that realize the functions performed by the radar device can be stored in various recording media such as memory, hard disk, SSD (Solid State Drive), IC card, SD card, optical disk, etc.
- SSD Solid State Drive
- IC card integrated circuit card
- SD card Secure Digital card
- optical disk etc.
- Object Target information 33... Integration unit, 35... Radome, 36... Target, 37a, 37b... Target speed, 39... Alarm unit, 40... Information transmitting unit, 41... Alarm suppression signal, 42... Vehicle information receiving unit, 43 ...Folding signal, 44...Deployment signal, 45...Stop signal, 47...Power supply section, 48...Motor control section, 49...Deployment instruction, 101...CPU, 102...ROM, 103...RAM, 104...Nonvolatile storage, 105 ...Network interface, 106...Input device, 107...Output device
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Abstract
Description
本願は、上記課題を解決する手段を複数含んでいるが、その一例を挙げるならば、レーダ装置として、車両に設置され、周囲に送信波を送信するとともに物体によって反射された反射波を受信する送受信部と、送受信部の受信信号に基づいて、物体を検知する検知処理部と、車両のヨーレート情報を取得する情報取得部と、検知処理部が検知した少なくとも一つの物体について、送受信部車両に対する位置変化により発生する周速度を求め、周速度とヨーレート情報とを比較して送受信部の軸ずれを判定する軸ずれ判定部と、を備える。
上記した以外の課題、構成および効果は、以下の実施形態の説明により明らかにされる。
以下、本発明の第1の実施の形態例を、図1~図13を参照して説明する。
図1は、本実施の形態例のレーダ装置1と制御装置7の構成を示す図である。
本実施の形態例のレーダ装置1は、後述する図3に示す車両(トラック)の前方の左側または右側の車両可動部5に取付けられる。車両可動部5は、運転者が側方を確認するためのドアミラーが取り付けられたドアミラーステーとして構成されている。したがって、車両可動部5に取付けられたレーダ装置1やドアミラーは、車両可動部5の動きに連動して可動する。レーダ装置1の可動状態の例は図3で後述する。
送受信部13は、高周波信号の送受信処理を行う。すなわち、送受信部13の内部の発振器で生成され送信用増幅器で増幅された高周波信号は、送信アンテナ27からレドーム35を介して、ミリ波帯の送信波29となって空間へ放射される。
受信波30は空間を伝搬後に再度レドーム35を介して受信アンテナ28で受信される。受信アンテナ28で受信された信号は、送受信部13内の受信用増幅器で増幅され、混合器にて発振器の高周波信号と混合されて、中間周波 (Intermediate Frequency:IF)信号が生成される。IF信号は、送受信部13内のアナログ/デジタル変換器でデジタル信号に変換された後、そのデジタル信号を受信信号として、検知処理部14に渡される。
制御装置7の車両情報処理部10は、車両に搭載された車両センサ9に基づいて車両情報11を生成する。ここでの車両情報11としては、車両の回転を示すヨーレート情報や、車両が走行しているか停止しているかを示す情報など含まれる。
運転者が車室内で電動格納スイッチ8を操作することで、制御装置7の折畳信号出力部7a、展開信号出力部7b、または停止信号出力部7cから、折畳信号43、展開信号44、停止信号45のいずれか一つが出力され、車両可動部5のモータ6に供給される。
モータ6は、ドアミラーが取り付けられたドアミラーステーである車両可動部5を折畳状態(格納状態)と展開状態との間で可動させる駆動部である。
図2は、車両可動部5が、折畳状態と展開状態との間で可動する例を示す。図2は、車両2を真上から見た図であり、図2の上側が運転席である。
図2に示すように、ドアミラーステーである車両可動部5は、トラックである車両2の左前方に取り付けられている。図2では左前方に取り付けた例を示すが、右前方に取り付けてもよい。
図2に示すそれぞれの位置のレーダ装置1a,1b,1cは、検知範囲である視野角(FoV:Field of View)4が扇形に形成されている。
具体的には、車両可動部5に取付けたレーダ装置1は、電動格納スイッチ8の操作に基づいたモータ6の動作により、レーダ装置(展開)1a→レーダ装置(折畳)1bと取付位置が変化する。このような動作時には、レーダ装置1に軸ずれが起きている。
図3に示すように、自車両2が自車直線方向201に進行中に、モータ6の作動により、レーダ装置(展開)1a→レーダ装置(折畳)1bへと取付位置が変化する場合には、レーダ装置1により検出される物標36に、車両可動部5の回転成分に対応した周速度18が発現し、周速度18が重畳した物標速度(回転成分有り)37bが生じる。
ここで、自車走行状態には、主に直線走行、停止、曲線走行の3通りがあるが、これらの状態に起因した周速度18については、車両情報11のヨーレート情報17(図13参照)を用いて確認することができる。
本実施の形態例における軸ずれ検知は、例えばレーダ装置1の検知処理部14で行うことができる。レーダ装置1の検知処理部14は、例えば演算処理を行うコンピュータを備えて、軸ずれ検知処理を行うことができる。
図4は、レーダ装置1の内部で軸ずれ検知処理などを行う、レーダ装置1に搭載されたコンピュータのハードウェア構成例を示す。
レーダ装置1に搭載されたコンピュータは、プロセッサであるCPU(中央処理ユニット:Central Processing Unit)101と、ROM(Read Only Memory)102と、RAM(Random Access Memory)103と、不揮発性ストレージ104とを備える。不揮発性ストレージ104としては、例えばフラシュメモリやEEPROM(Electrically Erasable and Programmable Read Only Memory)が使用される。あるいは、HDD(Hard Disk Drive)やSSD(Solid State Drive)を使用してもよい。
また、レーダ装置1に搭載されたコンピュータは、ネットワークインターフェース105と、入力装置106と、出力装置107とを備える。
不揮発性ストレージ104は、レーダ装置1としての物体の検知処理や軸ずれ検知処理などを行うプログラムを記憶すると共に、車両情報11などを記憶する。ネットワークインターフェース105は、制御装置7との送受信機能を有する。入力装置106は、送受信部13からの受信信号の入力などを受け付ける。出力装置107は、警報部39などへの信号出力を行う。
次に、本実施の形態例による軸ずれ検知処理の流れを、図5~図10を参照して順に説明する。図5および図6は、車両2が直線走行している場合、図7および図8は、車両2が停止している場合、そして図9および図10は、車両2が曲線走行している場合である。各図の左側は、車両可動部5の位置または動きを車両2の上側から示し、各図の右側は、軸ずれ判定処理を行うフローチャートを示す。
ステップS11で回転成分がない場合(ステップS11のNO)、検知処理部14は、直線走行中または停止中と判断して、軸ずれ検知処理を終了する。また、ステップS11で回転成分がある場合(ステップS11のYES)、検知処理部14は、回転成分が車両情報で得られるヨーレートとほぼ等しいか否かを判断する(ステップ12)。
図5は、車両2が直線進行方向201で走行をしている場合である。
この場合には、レーダ装置1で検出されるそれぞれの物標36には周速度18は発現せず、回転成分無しの物標速度37aが検出される。したがって、検知処理部14での軸ずれ判定のフローチャートの処理では、ステップS11の「複数物標に回転成分有り」の判定でNOになる。
この場合には、車両2が直線進行方向201に進み、かつモータ6が作動するので、物標36に周速度が発現し、回転成分18が含まれる物標速度37bが生じる。したがって、検知処理部14での軸ずれ判定のフローチャートの処理では、ステップS11の「複数物標に回転成分有り」の判定でYESとなり、ステップS12の「回転成分=ヨーレート?」の判定ではNOとなるので、モータ6の作動による軸ずれと判定できる。
この場合には、直線走行時と同じように物標36に周速度は発現せず、回転成分無しの物標速度37aが生じる。したがって、検知処理部14での軸ずれ判定のフローチャートの処理では、ステップS11の「複数物標に回転成分有り」の判定でNOとなる。
この場合には、物標36に周速度が発現し、回転成分有りの物標速度37bが生じる。したがって、検知処理部14での軸ずれ判定のフローチャートの処理では、ステップS11の「複数物標に回転成分有り」の判定でYESとなり、ステップS12の「回転成分=ヨーレート?」の判定ではNOとなるので、ステップS14でモータ6の作動による軸ずれと判定できる。
この場合には、レーダ装置1で検出されるそれぞれの物標36には周速度が発現し、回転成分18が含まれる物標速度37bが生じる。したがって、検知処理部14での軸ずれ判定のフローチャートの処理では、ステップS11の「複数物標に回転成分有り」の判定でYESになり、ステップS12の「回転成分=ヨーレート?」の判定でもYESになるので、ステップS13で周速度18が自車曲線走行によるものと判定できる。
この場合には、レーダ装置1で検出されるそれぞれの物標36には周速度18が発現し、回転成分が含まれる物標速度37bが生じる。したがって、検知処理部14での軸ずれ判定のフローチャートの処理では、ステップS11の「複数物標に回転成分有り」の判定でYESになり、ステップS12の「回転成分=ヨーレート?」の判定ではNOになるので、ステップS14でモータ6の作動による軸ずれと判定できる。
図11に示すように、自車両2が自車曲線進行方向202に進むと、物標36にはt=0において、角速度ω2とヨーレートで設定している後輪車輪中心w1からの距離R2に応じた周速度(Y)19がω2・R2として、距離R2を半径とした円の接線方向に発現する。
つまり、2サイクル分の物標情報データを用いることで、周速度のベクトル算出が可能となる。
実際の物標速度304は、自車速度303、相対速度305、周速度(Y)301および周速度(M)302の各ベクトルを合成することで求まる。すなわち、以下の関係式となる。
物標速度=自車速度+相対速度+周速度(Y)+周速度(M)
ここで、左辺を周速度(M)20として展開すると、
周速度(M)=自車速度+相対速度+周速度(Y)-物標速度=α
の関係となる。つまりα≠0かどうかを判定することで、軸ずれの判定が可能となる。この軸ずれ判定に関する処理は、図1に示す構成の場合、レーダ装置1内の検知処理部14で行われる。
なお、検知処理部14の内部で、検出した物標が適正か否かを判断してもよいが、軸ずれ有無の判定を行う処理部をレーダ装置1に設けて、その処理部での判定結果を制御装置7に送って、対応した制御を行うようにしてもよい。
図13に示すレーダ装置1や制御装置7のその他の構成は、図1に示すレーダ装置1や制御装置7と同様に構成される。
次に、本発明の第2の実施の形態例を、図14を参照して説明する。図14において、第1の実施の形態例で説明した図1~図13と同様の構成については、同一の符号を付し、その詳細な説明は省略する。
本実施の形態例のレーダ装置1は、図13に示すレーダ装置1と同様に、判定部15を備える。判定部15は、検知処理部14から複数の物標情報に含まれる周速度と車両情報に含まれるヨーレート情報17とを取得して、周速度とヨーレートとを比較して、軸ずれ有無の判定処理を行う。この軸ずれ有無の判定処理は、図5~図10に示すフローチャートにより行われる。
図14に示すレーダ装置1や制御装置7のその他の構成は、図1に示すレーダ装置1や制御装置7と同様に構成される。
これにより、本発明の第2の実施の形態例によると、軸ずれ状態での不要作動の発生を抑制する効果を得ることができる。
次に、本発明の第3の実施の形態例を、図15を参照して説明する。図15において、第1および第2の実施の形態例で説明した図1~図14と同様の構成については、同一の符号を付し、その詳細な説明は省略する。
本実施の形態例のレーダ装置1は、図14に示すレーダ装置1と同様に、判定部15を備えると共に、判定部15での軸ずれ結果24を記憶する記憶部21を備える。記憶部21は、不揮発性の記憶素子から構成するのが好ましい。
図15に示すレーダ装置1や制御装置7のその他の構成は、図14に示すレーダ装置1や制御装置7と同様に構成される。
なお、図15に示す構成では、図14の例と同様に、判定部15から警報部39に警報抑制信号41を送るようにしたが、図15に示すように、判定部15の出力を制御装置7に供給する場合に、記憶部21を備えてもよい。
次に、本発明の第4の実施の形態例を、図16を参照して説明する。図16において、第1~第3の実施の形態例で説明した図1~図15と同様の構成については、同一の符号を付し、その詳細な説明は省略する。
本実施の形態例のレーダ装置1は、図15に示すレーダ装置1と同様に、判定部15を備える。判定部15は、検知処理部14から複数の物標情報に含まれる周速度と車両情報に含まれるヨーレート情報17とを取得して、周速度とヨーレートを比較して、軸ずれ結果24を得る。
判定部15が出力する軸ずれ結果24は、積算部33に供給されて積算される。積算部33は、予め設定している軸ずれ確認周期と角速度(M)の結果を積算することで、実際の軸ずれ量46を算出する。算出した実際の軸ずれ量46は、記憶部21に記憶される。この記憶部21も、不揮発性の記憶素子で構成するのが好ましい。
図16に示すレーダ装置1や制御装置7のその他の構成は、図15に示すレーダ装置1や制御装置7と同様に構成される。
次に、本発明の第5の実施の形態例を、図17を参照して説明する。図17において、第1~第4の実施の形態例で説明した図1~図16と同様の構成については、同一の符号を付し、その詳細な説明は省略する。
本実施の形態例のレーダ装置1は、図16に示すレーダ装置1と同様に、判定部15と積算部33と記憶部21とを備える。そして、積算部33が、判定部15が出力する軸ずれ結果24を積算し、積算して得た実際の軸ずれ量46を記憶部21に記憶させる点は、図16の構成と同じである。
展開命令49を受信した制御装置7は、展開信号出力部7bが展開信号44をモータ6に供給する。
図17に示すレーダ装置1や制御装置7のその他の構成は、図16に示すレーダ装置1や制御装置7と同様に構成される。
なお、本発明は、上述した各実施の形態例に限定されるものではなく、様々な変形例が含まれる。例えば、上記した実施の形態例は、本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。
また、上述した各実施の形態例では、レーダ装置内で軸ずれ判定を行うようにしたが、レーダ装置からの情報に基づいて、制御装置で軸ずれ判定を行い、対応した制御を行うようにしてもよい。
さらに、図6などに示すフローチャートに示す処理の順序についても一例を示すものであり、処理結果に影響を及ぼさない範囲で、処理の順序を変更してもよく、あるいは複数の処理を同時に実行してもよい。
Claims (7)
- 車両に設置され、周囲に送信波を送信するとともに物体によって反射された反射波を受信する送受信部と、
前記送受信部の受信信号に基づいて、物体を検知する検知処理部と、
前記車両のヨーレート情報を取得する情報取得部と、
前記検知処理部が検知した少なくとも一つの物体について、前記送受信部の前記車両に対する位置変化により発生する周速度を求め、前記周速度と前記ヨーレート情報とを比較して前記送受信部の軸ずれを判定する軸ずれ判定部と、を備える
レーダ装置。 - 前記判定部により、軸ずれ判定となった場合に警報抑制信号を発報し、レーダ警報機能を抑制する
請求項1に記載のレーダ装置。 - 前記判定部は、当該レーダ装置の軸ずれ量を記憶する記憶部を備える
請求項2に記載のレーダ装置。 - 前記記憶部が記憶するレーダ軸ずれ量を積算して、実軸ずれ量を得る積算部を備える
請求項3に記載のレーダ装置。 - 電源起動時に、当該レーダ装置の設置箇所を展開および格納するモータに、展開命令信号を出力するモータ制御部を備える
請求項4に記載のレーダ装置。 - 前記モータを起動させるスイッチの情報を取得する
請求項5に記載のレーダ装置。 - 車両に設置されたレーダ装置の信号を処理するレーダ信号処理方法であって、
前記レーダ装置の送受信部によって送信した送信波が物体で反射した受信信号に基づいて、物体を検知する検知処理と、
前記車両のヨーレート情報を取得する情報取得処理と、
前記検知処理によって検知した少なくとも一つの物体について、前記送受信部の前記車両に対する位置変化により発生する周速度を求め、前記周速度と前記ヨーレート情報とを比較して前記送受信部の軸ずれを判定する軸ずれ判定処理と、を含む
レーダ信号処理方法。
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| JP2012068216A (ja) * | 2010-09-27 | 2012-04-05 | Mazda Motor Corp | センサの方位ずれ検出装置 |
| JP2021143906A (ja) * | 2020-03-11 | 2021-09-24 | 株式会社デンソー | 軸ずれ検出装置、及び、軸ずれ検出プログラム |
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