JP5971993B2 - Reflector, radar apparatus, and radar system - Google Patents

Description

  The present invention relates to a reflector, a radar apparatus, and a radar system, and more particularly, a reflector for enabling identification information (ID) of a target to be detected from a received signal obtained by reflecting a radiated pulse signal by the target. , A radar apparatus, and a radar system.

  Detects position information of a target by emitting a transmission signal such as a laser, radio wave, or ultrasonic wave and receiving and processing a reflected wave reflected by a moving object (target) such as a person or a car. A radar device as a moving body detection sensor has been widely known. Since such a radar apparatus only receives a reflected wave reflected by a target, it is called a primary radar system (passive system) radar apparatus. As the position information of the target detected by the radar device, the distance from the radar device to the target, the relative speed of the target viewed from the radar device, the direction of the target viewed from the front direction where the transmission signal is emitted from the radar device There are horns, etc.

  The radar apparatus as described above can detect position information of a target, but cannot acquire identification information (ID information) for individually identifying a plurality of targets. In order to acquire ID information for each target, for example, the target needs to have communication means so that bidirectional communication can be performed with the radar apparatus. A radar system having such two-way communication is called a secondary radar system (active system).

  In a primary radar system that detects position information of a target, for example, a position signal can be detected by emitting a signal in the 24.125 GHz band. However, radio waves in the frequency band used in such a primary radar system can be detected. Cannot be used for communication. In addition, for example, 2.4 GHz band radio waves can be used for bidirectional communication with the target, but radio waves in this band cannot be used for primary radar position information detection. Therefore, in the secondary radar system that detects both the position information of the target and the ID information, it is necessary to add a bidirectional communication means to the radar apparatus of the primary radar system.

  An aircraft is known as a moving object including a secondary radar type radar device. For example, Non-Patent Document 1 describes a method for acquiring ID information using a secondary surveillance radar (SSR) of an aircraft. According to the description of Non-Patent Document 1, it is difficult to obtain information such as an enemy friendly or type of aircraft, identification of a specific aircraft, and flight altitude only by echoes from a radar. Therefore, it is said that it can be identified by transmitting a code pulse on the radio wave from the ground, sending a specific pulse back in response to this on the machine, and receiving and decoding this on the ground. . In the airport monitoring radar (ASR), a communication frequency for the secondary monitoring radar is provided in a frequency band different from the frequency used for the primary monitoring radar (2.8 GHz) (1.036 GHz for questioning / 1. 09 GHz). Therefore, the aircraft needs a communication device for receiving the interrogation pulse and retransmitting the information of the own aircraft.

  Patent Document 1 discloses a technique for providing air traffic controllers with status grasping data indicating the vehicle position on the ground of the airport and the ID of each vehicle detected on the ground of the airport. It is configured to provide target ID information to the ground radar monitoring system by mounting a transponder on an aircraft, a towing vehicle, a snowplow and other vehicles that are often operated on the ground of an airport. The technique described in Patent Document 1 also requires a separate communication device as in Non-Patent Document 1.

Japanese translation of PCT publication No. 8-511867

Takashi Yoshida, “Radar Technology”, IEICE July 1, 1990 (7th edition), p. 247-251

  As described above, in the conventional radar apparatus, in order to obtain the ID information of the target object, the transmission signal from the radar apparatus is received by the receiver of the target object, and the signal is received again in response thereto. An active method is employed in which necessary information is modulated and retransmitted. For this reason, a communication device using transmission / reception devices such as an oscillator, a multiplier, a filter and the like is required, and there is a problem that the circuit scale increases and the cost increases. In addition, because it is a method of generating and retransmitting radio waves on the target target side, only radio waves in the band allowed to be retransmitted by the Radio Law can be used, and applicable fields are extremely limited. It was.

  The present invention has been made in view of the above problems, and a low-cost reflector, a radar apparatus, and the like that enable detection of target identification information (ID information) from a reflected wave of a transmission signal with a simple configuration. And a radar system.

In order to solve the above problems, a first aspect of the reflector of the present invention is a reflector that reflects a transmission signal that is arranged on a target detected by a radar device and that is radiated from the radar device. Specific information providing means for changing the amplitude of the wave with a unique pattern over time , wherein the specific information providing means reflects a part of the incident transmission signal and transmits the others, and the first A second reflecting plate that is arranged in parallel to the position overlapping the first reflecting plate on the side opposite to the reflecting surface of the reflecting plate and reflects all the transmitted signals that have entered, the first reflecting plate, and the first reflecting plate And a power unit that changes the interval between the two reflection units, and when the free space wavelength of the transmission signal is λ, the power unit sets the interval to λ / 4 and 0 in the unique pattern. It is characterized by alternately changing .

In another aspect of the reflector of the present invention, the first reflecting plate is configured to cut off a portion other than the reflecting portion of the first reflecting plate that reflects a part of the incident transmission signal. And a transmission part for transmitting other of the transmission signal to the second reflection plate.

  In another aspect of the reflector of the present invention, the first reflector has a mesh filter structure that reflects part of the incident transmission signal and transmits the other part to the second reflector. It is characterized by.

Another aspect of the reflector of the present invention is a reflector that is arranged on a target detected by a radar device and reflects a transmission signal emitted from the radar device, and the amplitude of the reflected wave reflected is a unique pattern. Unique information providing means for changing the time, wherein the unique information providing means reflects part of the transmission signal when it coincides with the polarization direction of the incident transmission signal and transmits the other, and the polarization direction A first reflecting plate having a substantially circular shape that is totally reflected when rotated by approximately 90 ° from the first reflecting plate, and a concentric and parallel arrangement with a predetermined interval on the opposite side of the reflecting surface of the first reflecting plate. A substantially circular second reflector that reflects all of the transmission signal incident thereon, and a power unit that rotates the first reflector, and when the free space wavelength of the transmission signal is λ, The spacing is approximately equal to λ / 4 and the front Power unit is rotated alternately the previous SL-specific pattern first reflector and another rotation angle is rotated by substantially 90 ° to the rotation angle and the rotation angle that matches the polarization direction of the transmission signal It is characterized by making it.
Another aspect of the reflector of the present invention is characterized in that the reflector has a radar scattering cross section larger than a radar scattering cross section of the target.

According to a first aspect of the radar apparatus of the present invention, a transmission unit that generates a transmission signal, a transmission antenna that inputs the transmission signal from the transmission signal and radiates it in space, and the transmission signal is reflected by a target A receiving antenna that receives a reflected wave; a receiving unit that processes the received reflected wave to acquire observation data; and a control calculation unit that receives the observation data and detects position information of the target. the radar device, the control arithmetic unit further comprises a ID · tracking calculating unit to track the time variation of the amplitude of the reflected wave included in the observation data to detect the identification information of the target object, above When the said reflected wave from the reflector of any one aspect of the present invention is received by the receiving antenna, the ID · tracking operation unit, assigned by the reflector from the time variation of the amplitude It detects the previous SL-specific pattern, and detecting the identification information of the target object from the previous SL-specific pattern.

  In another aspect of the radar apparatus of the present invention, the ID / tracking calculation unit has a correspondence table between the unique period or the unique pattern and the target identification information, and uses the correspondence table. The identification information of the target is acquired from the unique period or the unique pattern.

A first aspect of a radar system according to the present invention is characterized by including the reflector according to any one aspect of the present invention described above and the radar apparatus according to any one aspect of the present invention described above .

  According to the present invention, it is possible to provide a low-cost reflector, a radar apparatus, and a radar system that can detect target identification information (ID information) from a reflected wave of a transmission signal with a simple configuration. It becomes.

1 is a block diagram illustrating a configuration of a radar apparatus and a radar system according to a first embodiment of the present invention. It is a schematic diagram for demonstrating an example of the target detected with the radar apparatus and radar system of 1st Embodiment. It is the top view and side view which show the structure of the reflector of 1st Embodiment. It is a side view which shows the operation state of the reflector of 1st Embodiment. It is a signal waveform diagram which shows an example of the reflected wave from the several target by which the reflector of 1st Embodiment is arrange | positioned. It is a signal waveform diagram which shows another example of the reflected wave from the several target by which the reflector of 1st Embodiment is arrange | positioned. It is a pattern diagram which shows an example which changed the pattern which operates the reflector of 1st Embodiment. It is the top view and side view which show the structure of the reflector which concerns on another embodiment of this invention. It is the top view and side view which show the structure of the reflector which concerns on another embodiment of this invention.

  A reflector, a radar device, and a radar system according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. Each component having the same function is denoted by the same reference numeral for simplification of illustration and description.

(First embodiment)
A radar apparatus and a radar system according to a first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a radar apparatus 100 and a radar system 1 according to the present embodiment. In FIG. 1, a radar apparatus 100 includes a transmission unit 110 that generates a pulsed transmission signal, a transmission antenna 01 that radiates the transmission signal generated by the transmission unit 110 to space, and a transmission signal that is radiated from the transmission antenna 101. Receiving antennas 102 and 103 that receive reflected waves reflected by a target (object), a receiving unit 120 that receives and processes received signals from the receiving antennas 102 and 103, and a signal that is processed by the receiving unit 120 And a control calculation unit 130 that detects position information of the target and the like.

  The radar apparatus 100 of the present embodiment has a configuration of a coherent pulse radar, and the reception unit 120 processes the reception signals input from the two series of reception antennas 102 and 103 by a phase monopulse method to perform target object detection. Detect location information. The receiving unit 120 includes a hybrid unit 121 that generates a sum signal and a difference signal based on two series of received signals, a switch 122 that inputs a sum signal / difference signal from the hybrid unit 121 and cuts out a signal for each distance, A reception processing unit 123 that processes a signal for each distance input from the switch 122 to acquire observation data in a predetermined detection range.

  The control calculation unit 130 includes a distance calculation unit 131 that receives observation data from the reception processing unit 123 and detects target position information, a relative speed calculation unit 132, and an angle calculation unit 133. The distance calculation unit 131 detects the distance to the target based on the observation data. In addition, the relative speed calculation unit 132 detects the relative speed of the target based on the observation data. Further, the angle calculation unit 133 detects the azimuth angle of the target based on the observation data. The radar apparatus 100 of the present embodiment has a configuration that detects the distance to the target, the relative speed of the target, and the azimuth of the target as the position information of the target, but is not limited thereto, For example, only the distance calculation unit 131 may be provided and only the distance to the target may be detected.

  In addition, the control calculation unit 130 controls the transmission unit 110 and the reception unit 120, and includes a transmission control unit 134 and a reception control unit 135 as the respective control units. The transmission control unit 134 controls the transmission unit 110 to generate a transmission signal at a predetermined timing. Further, the reception control unit 135 inputs the generation timing of the transmission signal from the transmission control unit 134, and controls the switch 122 so as to sequentially extract a signal within a predetermined detection range from the reception signal based on this timing.

  The radar apparatus 100 and the radar system 1 according to the present embodiment are configured to detect a target and acquire its position information, and to acquire identification information (ID information) of the detected target. As a transmission signal generated by the transmission unit 110, for example, a signal having a frequency of 24.125 GHz in the ISM band can be used. Although ISM band radio waves can be used for mobile object detection sensors, they cannot be used for bidirectional communication. Therefore, the target ID information cannot be acquired by active means using bidirectional communication. The radar apparatus 100 according to the present embodiment is configured to acquire target ID information by passive means without performing bidirectional communication.

  The radar apparatus 100 includes an ID / tracking calculation unit 140 in the control calculation unit 130 in order to acquire ID information of the detected target. The ID / tracking calculation unit 140 detects the ID information of the target from the observation data acquired by the reception processing unit 123. That is, in the present embodiment, the ID information of the target is included in the reflected wave reflected by the target, and the ID / tracking calculation unit 140 detects the ID information included in the reflected wave from the observation data. It is configured. The ID / tracking calculation unit 140 performs target tracking processing and ID recognition processing in order to obtain target ID information.

  In order to make the reflected wave reflected by the target have the ID information of the target, the reflector 10 according to the first embodiment of the present invention as shown in FIG. 3 is arranged on the target. However, there may be a target on which the reflector 10 is not arranged, and in that case, it can be identified as a target on which no reflector is arranged.

  An example of a target to be detected by the radar apparatus 100 is shown in FIG. In the figure, the targets T1 and T2 are each provided with the reflector 10 of the present embodiment, whereas the target T3 is not provided with the reflector 10. The radar apparatus 100 can detect position information of the targets T1, T2, and T3. On the other hand, for ID information, information on the targets T1 and T2 can be detected, but information on the target T3 cannot be detected. The radar apparatus 100 detects the ID information of the targets T1 and T2 by processing the reflected waves from the reflectors 10 arranged on the targets T1 and T2.

  The reflector 10 of this embodiment is a passive device that does not have an active communication function and simply reflects the radio wave radiated from the transmission antenna 101 of the radar apparatus 100. Therefore, in order to transmit the ID information to the radar apparatus 100 in a passive manner, the reflector 10 has unique information adding means for adding unique ID information to the reflected wave.

  The reflector 10 according to the present embodiment includes specific information providing means for adding, to the reflected wave, periodic information in which the intensity (amplitude) of the reflected wave changes with time in a specific period as the unique information. The intensity of the reflected wave reflected by the reflector 10 changes with time in a period inherent to the reflector 10 (hereinafter referred to as the intrinsic period of the reflector 10), and this reflected wave is received by the receiving antennas 102 and 103. When received, the ID / tracking calculation unit 140 detects the natural period of the reflector 10. That is, the ID / tracking calculation unit 140 tracks the time change of the amplitude of the reflected wave from the observation data acquired by the reception processing unit 123, and determines the natural period of the reflector 10 from the time change of the amplitude. Then, the target ID is identified from the detected natural period of the reflector 10.

  The ID / tracking calculation unit 140 stores, for example, a correspondence table between the natural period of the reflector 10 and the target ID in advance, and identifies the target ID from the natural period detected using the correspondence table. Can be configured. In another embodiment in which information other than the above-described natural period is used as the unique information of the reflector, a correspondence table between the unique information of the reflector and the target ID can be created and used in advance.

  The reflector 10 of this embodiment is demonstrated using FIG. The reflector 10 includes reflectors 11 and 12 and a power unit 13. FIG. 3A shows a plan view of the reflector 10, and FIG. 3B shows a side view of the reflector 10. FIG. (C), (d) has each shown the top view of the reflecting plates 11 and 12. FIG. The reflection plate 12 is formed in a total reflection state that reflects incident waves on the entire surface thereof. On the other hand, the reflecting plate 11 is formed so that a part of the surface reflects the incident wave, but the remaining part transmits the incident wave. That is, the reflecting plate 11 has a structure in which a part of the surface of the same reflecting plate as the reflecting plate 12 is left to be a reflecting portion 11a, and the other portion is cut to be a transmitting portion 11b.

  The reflector 10 has a structure in which the reflecting plate 11 is arranged in parallel and overlapping with the reflecting plate 12 and the power unit 13 supports the reflecting plate 11 so as to be movable with respect to the reflecting plate 12. Or you may comprise so that the power part 13 may support the reflecting plate 12 with respect to the reflecting plate 11 so that a movement is possible. The power unit 13 repeatedly moves the reflecting plate 11 or the reflecting plate 12 so that the interval d between the reflecting plate 11 and the reflecting plate 12 periodically changes. The operating state of the reflector 10 is shown in FIG. 4A shows a state when the distance d between the reflecting plate 11 and the reflecting plate 12 is maximum, and FIG. 4B shows the state where the reflecting plate 11 and the reflecting plate 12 are in close contact with each other. The state when 0 becomes 0 is shown.

  As the unique information providing means of the reflector 10, it is desirable that the difference between the reflected wave reflected by the reflector 10 is large when the intensity is high and low. When the intensity of the reflected wave is lowered, the reflector 10 desirably reflects the incident wave as much as possible, and ideally does not reflect at all.

  When the wavelength of the transmission signal generated by the transmitter 110 is λ, the interval d is set so that the intensity of the reflected wave from the reflector 10 is as low as possible when the interval d shown in FIG. Is preferably equal to λ / 4. At this time, the phase of the reflected wave reflected by the reflecting plate 11 and the reflected wave transmitted through the reflecting plate 11 and reflected by the reflecting plate 12 are different by λ / 2. As a result, the reflected wave reflected by the reflecting plate 11 and the reflected wave reflected by the reflecting plate 12 cancel each other, and the intensity of the reflected wave from the reflector 10 is greatly reduced. It is preferable to form the reflecting plate 11 so that the intensity of the reflected wave reflected by the reflecting plate 11 and the intensity of the reflected wave transmitted through the reflecting plate 11 and reflected by the reflecting plate 12 are substantially equal.

  On the other hand, when the interval d shown in FIG. 4B is 0, the reflected wave reflected by the reflecting plate 11 and the reflected wave reflected by the reflecting plate 12 are substantially in phase, The reflector 10 is almost totally reflected, and the intensity of the reflected wave is maximized. When the frequency of the transmission signal generated by the transmission unit 110 is 24.125 GHz (wavelength λ = 12.44 mm), the maximum value of the interval d shown in FIG. 4A is about 3.11 mm.

  The period of intensity change of the reflected wave, which is the natural period of the reflector 10, is given by the repetition period of the reflector 11 or 12 operated by the power unit 13. By making the repetition period different for each reflector 10, the natural period can be made different for each reflector 10.

  An example of the reflected wave from each reflector 10 arranged on a plurality of targets is shown in FIG. In FIG. 5, (a) shows a transmission signal generated by the transmission unit 110, (b) is a natural period of the reflector 10 (hereinafter referred to as reflector 10-1) arranged on the first target, That is, the period which changes the space | interval of the reflecting plates 11 and 12 of the reflector 10-1 is shown. Similarly, FIG.5 (c) has shown the natural period of the reflector 10 (henceforth the reflector 10-2) arrange | positioned at the 2nd target. 5D and 5E show the reflected waves reflected by the reflectors 10-1 and 10-2, respectively.

  In the example shown in FIG. 5, it is assumed that the pulse width of the transmission signal is shorter than the period of the reflector 10 (reflectors 10-1 and 10-2). In this case, the ID / tracking calculation unit 140 detects a reflected wave reflected during a period in which the reflector 10 is in a total reflection state as a reflected wave having a high intensity. As illustrated in FIGS. 5D and 5E, the reflectors 10-1 and 10-2 having different natural periods have different timings at which the radar apparatus 10 receives a reflected wave having a high intensity. A periodic reception pattern is obtained. The ID / tracking calculation unit 140 can determine the reception pattern by tracking the temporal change in the intensity (amplitude) of the received wave, and can determine the ID of the target from the determined reception pattern.

  Next, an example of a reflected wave from the reflector 10 when the pulse width of the transmission signal is longer than the period of the reflector 10 is shown in FIG. As in FIG. 5, (a) is a transmission signal, (b) is a natural period of the reflector 10-1, (c) is a natural period of the reflector 10-2, and (d) is a reflector 10-1. The reflected wave reflected and the reflected wave reflected by the reflector 10-2 are shown in (e), respectively.

  In the example shown in FIG. 6, a plurality of reflected waves with high intensity appear during a period when the transmission signal is incident on the reflector 10. The periods in which reflected waves with high intensity appear are different between the reflectors 10-1 and 10-2, and have their respective natural periods. The ID / tracking calculation unit 140 detects a period in which the amplitude increases by observing a temporal change in the intensity (amplitude) of the reflected wave obtained by radiating one transmission signal, and determines the ID of the target from this. Is possible.

  In the example shown in FIGS. 5 and 6, the period in which the reflector 10 reflects the incident signal with high intensity is made different for each reflector 10. However, the present invention is not limited to this, and for example, the power unit 13 is made for each reflector 10. You may make it operate | move by a different pattern. An example in which the pattern for operating the power unit 13 is changed for each reflector 10 is shown in FIG. FIG. 7A shows a reference pattern in which the power unit 13 is operated at a constant cycle so that the time interval for setting the reflector 10 to the total reflection state is constant. On the other hand, FIGS. 7B and 7C show examples of patterns in which the power unit 13 is operated so that the period in which the reflector 10 is totally reflected is different from the reference pattern.

  FIG. 7B shows a pattern in which the reflector 10 is not brought into the total reflection state once every three times of the reference pattern. FIG. 7C shows a pattern once every three times of the reference pattern. The pattern which makes the reflector 10 a total reflection state is shown. As described above, the pattern for operating the power unit 13 may be different for each reflector 10, and the pattern information illustrated in FIGS. 7B and 7C is used as unique information of the reflector 10. Can do. As an operation pattern of the reflector 10, for example, a Barker code sequence signal can be used.

  In the above description, the reflected wave reflected by the reflector 10 is described with reference to FIGS. 5, 6, and 7. However, the radar apparatus 100 reflects not only the reflected wave reflected by the reflector 10 but also the reflected wave reflected by the target itself. The waves are also received. Then, the reflected wave reflected by the target itself is processed to detect the position information of the target. Therefore, the position information of the target on which the reflector 10 is not arranged is detected. Further, for the target on which the reflector 10 is arranged, it is possible to detect ID information in addition to the position information. It is preferable that the intensity of the reflected wave reflected by the reflector 10 is higher than the reflected wave reflected by the target itself, and the radar scattering area of the reflector 10 is made larger than the radar scattering area of the target itself. Is good.

  The radar apparatus 100 and the radar system 1 of the present embodiment can detect the target ID from the reflected wave of the transmission signal only by arranging the reflector 10 of the present embodiment with a simple configuration on the target. . It is not necessary for the target to have an active communication means for notifying the ID, and it is possible to notify the radar apparatus 100 of the ID simply by arranging the reflector 10 having a simple configuration, thereby providing a low-cost radar apparatus. can do.

(Other embodiments)
A reflector according to another embodiment of the present invention will be described below with reference to FIGS. FIGS. 8 and 9 are configuration diagrams of reflectors 20 and 30 having configurations different from those of the reflector 10 of the first embodiment. FIG. 8 shows a plan view of one reflector 21 included in the reflector 20 of another embodiment. 9A and 9B are plan views of one reflector 31 included in the reflector 30 of still another embodiment, and FIG. 9C is the other reflector 32 included in the reflector 30. FIG. 9D shows a side view of the reflector 30.

  The reflector 20 shown in FIG. 8 differs in the structure of the reflecting plate 21 from the reflecting plate 11 of 1st Embodiment. The reflecting plate 11 of the first embodiment is partially cut away from the surface to form the transmission part 11b. However, the reflecting plate 21 of this embodiment has a mesh filter structure. The mesh filter has wavelength selectivity, and the reflector 21 has a mesh filter structure that partially transmits radio waves having the frequency of the transmission signal.

  Thereby, like the reflector 11 of the first embodiment, the reflector 21 transmits the radio wave reflected by the reflector 21 and the reflector 21 when the distance from the reflector 12 is λ / 4. The radio wave reflected by the reflecting plate 12 cancels out, and the intensity of the reflected wave can be reduced. Further, when the distance between the reflecting plate 21 and the reflecting plate 12 is 0, the phase of the reflected wave reflected by the reflecting plate 21 and the reflected wave reflected by the reflecting plate 12 are substantially the same. 20 is almost totally reflected, and the intensity of the reflected wave is maximized.

  Moreover, the reflector 30 shown in FIG. 9 has two reflecting plates 31 and 32 formed in a circular shape. The reflection plate 32 totally reflects the incident transmission signal in the same manner as the reflection plate 12 of the above embodiment. On the other hand, the reflecting plate 31 has a structure that partially transmits linearly polarized radio waves, and transmits only a transmission signal having a polarization that matches the linearly polarized wave. The reflectors 31 and 32 are arranged concentrically in parallel with an interval of λ / 4.

  When the transmission signal is a vertically polarized radio wave, when the reflecting plate 31 is in the rotation angle state shown in FIG. 9A, the transmission signal coincides with the polarization direction of the transmission signal, and a part thereof is transmitted. In the state of the rotation angle rotated by 90 ° as shown in b), the transmission signal is totally transmitted without being transmitted. As a result, when the reflecting plate 31 is in the state of FIG. 9A, a part of the transmission signal reflected by the reflecting plate 31 and the transmission signal transmitted through the reflecting plate 31 and reflected by the reflecting plate 32 cancel each other. As a result, the intensity of the reflected wave decreases. In addition, when the reflecting plate 31 is in the state of FIG. 9B rotated by 90 ° from the state of FIG. 9A, the transmission signal is totally reflected by the reflecting plate 31 and the intensity of the reflected wave is increased.

  The power unit 33 of the reflector 30 is arranged at a position corresponding to the center of each of the two reflecting plates 31 and 32 and has a structure for rotating the reflecting plate 31. The power unit 33 changes the state of the rotation angle shown in FIG. 9A and the state of the rotation angle shown in FIG. 9B at a predetermined natural period or a predetermined natural pattern. As a result, the intensity of the reflected wave from the reflector 30 can be changed with a predetermined natural period or natural pattern. As a result, the ID / tracking calculation unit 140 can detect the unique information of the reflector and obtain the ID information of the target.

  Note that the description in the present embodiment shows an example of the reflector, the radar apparatus, and the radar system according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of the reflector, the radar apparatus, and the radar system in the present embodiment can be appropriately changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Radar system 10, 20, 30 Reflector 11, 12, 21, 31, 32 Reflector 11a Reflecting part 11b Transmitting part 13, 33 Power part 100 Radar apparatus 101 Transmission antenna 102, 103 Reception antenna 110 Transmission part 120 Reception part 121 Hybrid Unit 122 switch 123 reception processing unit 130 control calculation unit 131 distance calculation unit 132 relative speed calculation unit 133 angle calculation unit 134 transmission control unit 135 reception control unit 140 ID / tracking calculation unit

Claims (8)

A reflector that is arranged on a target detected by a radar device and reflects a transmission signal emitted from the radar device,
With an intrinsic information providing means for time-changed in unique patterns the amplitude of was reflected reflected waves,
The unique information providing unit overlaps the first reflecting plate that reflects a part of the incident transmission signal and transmits the other, and the first reflecting plate on the side opposite to the reflecting surface of the first reflecting plate. A second reflecting plate that is arranged in parallel with the position and reflects all of the incident transmission signals; and a power unit that changes a distance between the first reflecting plate and the second reflecting unit.
The reflector according to claim 1, wherein when the free space wavelength of the transmission signal is λ, the power unit alternately changes the interval to λ / 4 and 0 in the unique pattern . The first reflecting plate forms an opening by excising a portion other than the reflecting portion of the first reflecting plate and a reflecting portion that reflects a part of the incident transmission signal, and forms the opening of the transmitting signal. The reflector according to claim 1 , further comprising: a transmission portion that transmits other light to the second reflection plate. It said first reflector, according to claim 1, characterized in that it has a structure of the mesh filter that transmits other reflects a part of the transmission signal entered to the second reflector Reflector. A reflector that is arranged on a target detected by a radar device and reflects a transmission signal emitted from the radar device,
A unique information providing means for changing the amplitude of the reflected wave reflected with time in a unique pattern;
The unique information giving means is
A substantially circular shape that reflects part of the transmission signal when it coincides with the polarization direction of the incident transmission signal and transmits the other part, and totally reflects when rotated by about 90 ° from the polarization direction. A first reflector;
A second reflecting plate having a substantially circular shape, which is arranged concentrically in parallel with a predetermined interval on the side opposite to the reflecting surface of the first reflecting plate and reflects all the transmitted signals incident thereon;
A power unit for rotating the first reflecting plate,
When the free space wavelength of the transmission signal is λ, the interval is substantially equal to λ / 4,
The power unit is alternately the previous SL-specific pattern first reflector and another rotation angle is rotated by substantially 90 ° to the rotation angle and the rotation angle that matches the polarization direction of the transmission signal wherein the rotating and to ruri Furekuta. The reflector according to any one of claims 1 to 4, wherein the reflector has a radar scattering cross section larger than a radar scattering cross section of the target. A transmission unit that generates a transmission signal, a transmission antenna that inputs the transmission signal from the transmission signal and radiates it in space, a reception antenna that receives a reflected wave in which the transmission signal is reflected by a target, and the received antenna A radar apparatus comprising: a receiving unit that processes reflected waves to acquire observation data; and a control calculation unit that inputs the observation data and detects position information of the target,
The control calculation unit further includes an ID / tracking calculation unit that detects the identification information of the target by tracking the time change of the amplitude of the reflected wave included in the observation data,
When the reflected wave from the reflector according to any one of claims 1 to 5 is received by the receiving antenna,
The ID · tracking calculation unit, a radar, characterized in that the front from the time variation of the amplitude imparted by the reflector Symbol detects specific patterns, detects the identification information of the target object from the previous SL-specific pattern apparatus. The ID · tracking calculation unit has a front Stories unique pattern has a correspondence table between the identification information of the target object, acquires identification information of the target object from the previous SL-specific pattern by using the correspondence table The radar apparatus according to claim 6 . A radar system comprising: the reflector according to any one of claims 1 to 5 ; and the rade device according to claim 6 or 7 .

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