WO2006009122A1 - モノパルスレーダ装置およびアンテナ切換スイッチ - Google Patents
モノパルスレーダ装置およびアンテナ切換スイッチ Download PDFInfo
- Publication number
- WO2006009122A1 WO2006009122A1 PCT/JP2005/013183 JP2005013183W WO2006009122A1 WO 2006009122 A1 WO2006009122 A1 WO 2006009122A1 JP 2005013183 W JP2005013183 W JP 2005013183W WO 2006009122 A1 WO2006009122 A1 WO 2006009122A1
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- antenna
- array
- antennas
- unit
- monopulse
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/02—Antennas or antenna systems providing at least two radiating patterns providing sum and difference patterns
-
- 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
- G01S13/44—Monopulse radar, i.e. simultaneous lobing
- G01S13/4445—Monopulse radar, i.e. simultaneous lobing amplitude comparisons monopulse, i.e. comparing the echo signals received by an antenna arrangement with overlapping squinted beams
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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
- G01S13/02—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
- G01S13/44—Monopulse radar, i.e. simultaneous lobing
- G01S13/4454—Monopulse radar, i.e. simultaneous lobing phase comparisons monopulse, i.e. comparing the echo signals received by an interferometric antenna arrangement
Definitions
- the present invention relates to a monopulse radar device, and in particular, a monopulse radar device in which antenna elements are effectively arranged in a limited space and a plurality of antennas of the monopulse radar device are selectively connected to a transmission / reception unit. This is related to the antenna switching switch.
- a radar device for detecting direction information of a target object in addition to information on the distance and speed of the target object a radar sensor is rotated by a turntable, and the angle of the turntable is detected to detect the target object.
- An example of a scan radar device that detects an arrival angle is disclosed (for example, Patent Document 1).
- the antenna elements arranged in a matrix, the series feed line provided for each column of the antenna elements there is a monopulse radar device including two parallel feed lines that perform parallel feed for each column of antenna elements via a series feed line and two powerful array antennas (for example, Patent Document 3).
- a monopulse radar device including two parallel feed lines that perform parallel feed for each column of antenna elements via a series feed line and two powerful array antennas.
- an antenna for performing monopulse processing in the two array antennas formed as described above, an antenna element array formed by a series feed line is used.
- the array antennas are arranged on the same plane so that all or some of the rows are alternately arranged at substantially equal intervals.
- Patent Document 1 Japanese Patent Laid-Open No. 10-325863
- Patent Document 2 JP-A-11 281729
- Patent Document 3 JP-A-9 162626
- Patent Document 4 Japanese Patent Laid-Open No. 2000-230974
- the scan radar device disclosed in Patent Document 1 requires accurate alignment with respect to the installation of the turntable on which the radar sensor is mounted, and vibration such as vibration caused by the mounted platform is also required. It had drawbacks such as the need for a structure to avoid the effects. In addition, when there are space restrictions on the platform, it was impossible to mount a radar sensor or a turntable, and the system could not be realized.
- the monopulse radar device disclosed in Patent Document 3 discloses a configuration of a reception antenna for performing monopulse processing, and is an effective configuration as an antenna unit including a transmission antenna. There is no disclosure about.
- a pair of receptions for monopulse processing are performed. This is to disclose that the element spacing of the antenna is different, and the configuration of the antenna unit including the transmission antenna is disclosed.
- the present invention has been made in view of the above, and includes a monopulse radar device and a part thereof capable of performing a wide range of monopulse processing while limiting mounting restrictions on a transmission / reception antenna system including a transmission antenna.
- the purpose is to provide an antenna switching switch.
- it is intended to provide a monopulse radar device that forms a transmission / reception antenna system in a limited space effectively, and configures a simple transmission / reception antenna system, and an antenna switching switch that constitutes a part thereof.
- Objective Means for solving the problem
- the monopulse radar device includes at least one transmission unit that generates and outputs a transmission signal for detecting a target.
- An antenna unit having two transmission antennas and a plurality of reception antennas, a reception unit for detecting predetermined information including azimuth information with respect to the target based on an output of the antenna unit force, the transmission unit and the transmission antenna
- a monopulse radar device including an antenna switching unit that switches connection between the receiving antenna and the receiving unit, the antenna unit includes a part of an antenna element that is a component of the antenna unit.
- an array antenna formed by a plurality of narrow beam array antennas formed as an array antenna having a beam width narrower than the array antenna, and formed as the narrow beam array antenna.
- Monopulse processing is performed based on outputs from a predetermined pair of array antennas among a plurality of array antennas.
- an array antenna is configured in the antenna unit by a part of the antenna element that is a component of the antenna unit. Also, multiple array antennas with a narrower beam width than this array antenna are configured. That is, a wide beam array antenna and a plurality of narrow beam array antennas are configured. Among the array antennas configured as described above, monopulse processing is performed based on the outputs of a predetermined pair of array antennas among a plurality of narrow beam array antennas.
- a monopulse radar device is characterized in that, in the above invention, the wide beam array antenna functions as a transmission antenna.
- the monopulse radar device is characterized in that, in the above invention, the wide beam array antenna also functions as a receiving antenna.
- the monopulse radar device is the above-described invention, wherein the main beam direction of each array antenna constituting the predetermined pair of array antennas is set to the left and right or up and down from the center direction. It is characterized by being eccentric.
- the predetermined pair of arrays Among the antennas, the array plane of the antenna elements constituting one of the array antennas in which the main beam direction is decentered from the center direction to the left direction or the upward direction has a predetermined inclination angle leftward or upward with respect to the reference array plane.
- an array surface of the antenna elements constituting the other array antenna in which the main beam direction is decentered in the center direction force rightward or downward from the predetermined pair of array antennas. It is characterized in that it is arranged to be inclined at a predetermined inclination angle in the right direction or downward direction with respect to the reference array surface.
- the monopulse radar device is the above invention
- the predetermined inclination angle applied to the one array antenna substantially coincides with an eccentric angle of the main beam direction of the one array antenna with respect to the main beam direction of the wide beam array antenna
- the other array The predetermined inclination angle force exerted on the antenna substantially matches the eccentric angle in the main beam direction of the other array antenna with respect to the main beam direction of the wide beam array antenna.
- the monopulse radar device is characterized in that, in the above invention, any one of the wide beam array antenna or the predetermined pair of array antennas functions as a transmission antenna.
- the monopulse radar device is the above invention, wherein either one of the predetermined pair of array antennas or the wide beam array antenna is transmitted. In addition to functioning as an antenna, monopulse processing is performed based on outputs of one and the other of the predetermined pair of array antennas.
- the monopulse radar apparatus is the antenna element according to the above-described invention, wherein the narrow beam array antenna includes a part of the antenna elements of the antenna unit connected in a vertical direction.
- a pair of array antennas are formed by connecting a predetermined number of groups alternately.
- the monopulse radar device includes an antenna unit including a transmission unit that generates and outputs a transmission signal for detecting a target, at least one transmission antenna, and a plurality of reception antennas. Based on the output from the antenna unit! /, A receiving unit for detecting predetermined information including azimuth information with respect to the target, a connection between the transmitting unit and the transmitting antenna, and the receiving antenna and the receiving unit
- the antenna unit includes three or more array antennas including antenna elements that are constituent elements of the antenna unit.
- Monopulse processing is performed based on the outputs of three or more pairs of array antennas with two or more pairs of array antennas having different element intervals. It shall be the features a.
- a monopulse radar device is the above-described invention.
- One of the three or more array antennas functions as a transmitting antenna, and the antenna beam of the array antenna that functions as the transmitting antenna is widened during transmission.
- the monopulse radar device is based on the sign of phase difference monopulse processed based on the outputs of the three or more pairs of antennas in the above invention. It is characterized by specifying the area where the target exists.
- each antenna pattern of the three or more pairs of array antennas when the area where the target exists cannot be uniquely specified.
- the area is specified based on the above.
- the monopulse radar device divides the detection area into a plurality of areas that do not cause phase rotation, and for each of the divided areas, It is characterized by decentering the main beam direction of a pair of array antennas.
- the array surface of the antenna elements constituting the array antenna when used as a reference array surface, the pair of three or more pairs described above is used.
- the array surface of the antenna elements constituting one array antenna with the main beam direction decentered from the center direction to the left or upward is predetermined in the left or upward direction with respect to the reference array surface.
- the arrangement surface is arranged to be inclined at a predetermined inclination angle in the right direction or the lower direction with respect to the reference arrangement surface.
- the monopulse radar device is the above-described invention, wherein the predetermined inclination angle acting on the one array antenna functions as the main beam direction of the array antenna that functions as the transmission antenna.
- the main beam direction of the array antenna that functions as the transmitting antenna is substantially equal to the eccentric angle in the main beam direction of the one array antenna with respect to the other array antenna. Based on It is characterized by substantially matching the eccentric angle in the main beam direction of the other array antenna.
- the monopulse radar device includes an antenna unit including a transmission unit that generates and outputs a transmission signal for detecting a target, at least one transmission antenna, and a plurality of reception antennas. Based on the output from the antenna unit! /, A receiving unit for detecting predetermined information including azimuth information with respect to the target, a connection between the transmitting unit and the transmitting antenna, and the receiving antenna and the receiving unit.
- the antenna unit includes three or more array antennas including antenna elements that are constituent elements of the antenna unit.
- the antenna switching unit amplifies a transmission signal from the transmission unit and supplies the amplified signal to one antenna.
- a second amplifier that amplifies the reception signal of the one antenna, a plurality of third amplifiers that respectively amplify the reception signals of the other plurality of antennas, an output of the second amplifier, and the plurality of second amplifiers And a first switch that selects and supplies one of the outputs of the three amplifiers to the receiving unit.
- the monopulse radar device according to Claim 19 of the present invention is the above-described invention, wherein the second switch provided between the output of the first amplifier and the one antenna is the first switch. And a third switch provided between the two antennas and the second amplifier.
- a monopulse radar device is the above-described invention.
- the second amplifier and the plurality of third amplifiers can be individually adjusted in gain, and the gain of the received signal can be made uniform by the gain adjustment.
- the antenna switching switch according to claim 22 of the present invention is an antenna switching switch for selectively connecting a plurality of antennas to a transmission unit or a reception unit, and amplifies a transmission signal from the transmission unit.
- a first amplifier for supplying to one antenna, a second amplifier for amplifying the reception signal of the one antenna, and a plurality of third amplifiers for amplifying the reception signals of the other antennas, respectively.
- the antenna switching switch according to claim 23 of the present invention is the above-described invention, wherein the second switch provided between the output of the first amplifier and the one antenna, And a third switch provided between the two antennas and the second amplifier.
- the on / off of the first amplifier and the on / off of the second switch are linked, and the on / off of the second amplifier is ON / OFF of the third switch is interlocked, and ON of any one of the second amplifier or the plurality of third amplifiers and selection of the first switch are linked. To do.
- the second amplifier and the plurality of third amplifiers can be individually gain-adjusted, and the gain adjustment It is possible to make the gains of received signals uniform.
- the invention's effect is possible to make the gains of received signals uniform.
- the monopulse processing is performed based on the outputs of a predetermined pair of array antennas among the plurality of narrow beam array antennas.
- the monopulse radar apparatus that is useful in the present invention, it is a component of the antenna unit.
- Monopulse processing is performed on the basis of outputs of a pair of array antennas of a predetermined group or more, each having a different element spacing, by combining two of the three or more array antennas composed of antenna elements. Therefore, there is an effect that an antenna beam suitable for monopulse processing can be formed without particularly changing the arrangement of the antenna elements constituting the array antenna and without performing special beam synthesis.
- the transmission signal amplified by the first amplifier is supplied to one antenna via the second switch, and the reception signal of one antenna is amplified.
- One of the outputs of the second amplifier and the outputs of the plurality of third amplifiers that respectively amplify the reception signals of the other plurality of antennas is selected by the first switch and supplied to the receiving unit.
- FIG. 1 is a block diagram showing a configuration of a monopulse radar apparatus according to the present invention.
- FIG. 2 is a diagram illustrating the principle of azimuth detection in the phase comparison monopulse method.
- FIG. 3 is a diagram showing the principle of azimuth detection in the amplitude comparison monopulse method, and shows two antenna patterns in which the center azimuth of the antenna beam is shifted.
- Fig. 3-2 shows the sum signal ( ⁇ ) and difference signal ( ⁇ ) signals generated based on the received signal received by the antenna of the antenna pattern shown in Fig. 3-1. It is a figure which shows intensity
- FIG. 3-3 is a diagram showing an angle error signal generated based on the sum signal ( ⁇ ) and the difference signal ( ⁇ ) shown in FIG. 3-2.
- FIG. 4 is a diagram illustrating an antenna configuration of the antenna unit according to the first embodiment.
- FIG. 5 is a diagram illustrating another antenna configuration of the antenna unit according to the first embodiment.
- FIG. 6 is a diagram showing a detection area of each array antenna shown in FIG.
- FIG. 7 is a diagram showing detection areas when the center directions of array antenna A and array antenna B shown in FIG. 6 are decentered to the left and right, respectively.
- FIG. 8 is a diagram illustrating an antenna configuration of the antenna unit according to the third embodiment.
- FIG. 9 is another diagram of power feeding to each antenna element of the antenna unit according to the third embodiment.
- FIG. 9 is another diagram of power feeding to each antenna element of the antenna unit according to the third embodiment.
- FIG. 10 shows the difference between the azimuth angle and the phase difference when phase comparison monopulse processing is performed based on three pairs of antennas, each of which is a combination of two of the three antennas shown in FIG. It is a graph which shows an example of a relationship.
- FIG. 11 is a flowchart showing a process flow of the third embodiment.
- FIG. 12 is a diagram showing an example of a beam pattern of antenna elements constituting the antenna unit.
- FIG. 13 is a flowchart showing a flow of processing of a signal processing unit which is helpful in the fourth embodiment.
- FIG. 14 is a diagram showing three candidate examples of target azimuth angles calculated based on the combination of array antennas D and E on the graph shown in FIG.
- FIG. 15-1 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface and the antenna element group of the antenna section shown in FIG.
- FIG. 15-2 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface and the antenna element group of the antenna unit according to the fifth embodiment.
- FIG. 16-1 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface and the antenna element group of the antenna section shown in FIG.
- FIG. 16-2 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface and the antenna element group of the antenna unit according to the sixth embodiment.
- FIG. 17 is a vehicle-mounted F having an antenna switching switch according to an embodiment of the present invention.
- FIG. 18 is a waveform diagram showing a modulated wave by a triangular wave.
- FIG. 19 is a waveform diagram showing waveforms of control signals shown in FIG.
- FIG. 1 is a block diagram showing a configuration of a monopulse radar apparatus that is useful in the present invention.
- the radar apparatus shown in FIG. 1 shows a configuration of a general monopulse radar apparatus.
- the monopulse radar apparatus according to the present invention is applied to the configuration of the transmitting / receiving antenna of the antenna unit, the configuration of the antenna switching unit, and the processing of the signal processing unit performed based on these configurations as described in detail below.
- the configuration of the monopulse radar apparatus to which the present invention is applied will be described.
- the monopulse radar apparatus shown in FIG. 1 includes processing units each having a processing function divided into large blocks, that is, an antenna unit 6, an antenna switching unit 7, a transmission unit 8, and a reception unit 10.
- the antenna unit 6 includes transmission / reception antennas 11, 11, 11 that function as either transmission antennas or reception antennas.
- the antenna switching unit 7 is a transmission / reception antenna 1
- the transmission unit 8 includes a modulation signal generation unit 15 that generates various modulation signals (for example, an FM-CW modulation signal, a pulse modulation signal, and the like) for generating a radar signal radiated into the space from the antenna unit 6, and this And an oscillator 14 that generates and outputs a radar signal modulated based on the modulation signal.
- the receiving unit 10 is connected to any one of the transmission / reception antennas 11, 11 and 11, respectively.
- Received signals output from these transmission / reception antennas 11, 11, 11 are supplied from an oscillator 14.
- RF mixer 16 (16, 16) that down-converts to IF band based on the supplied RF band mixer signal (RF local signal), and down-coupler connected to these RF mixers 16 respectively.
- IF mixer 17 (17, 17) for down-converting the converted signal into a baseband signal based on the IF band mixer signal (IF local signal) supplied from the antenna switching signal generator 19, and these IF mixers Various signals based on the signals output from
- the signal processing unit 20 for generating and outputting information such as distance, speed, and direction.
- the signal processing unit 20 also functions as a control unit that controls the transmission unit 8, the antenna switching unit 7, and the like.
- FIG. 2 is a diagram illustrating the principle of azimuth detection using the phase comparison monopulse method.
- the arrival angle 0 of the received wave determined by 0 can be detected.
- FIGS. 3-1 to 3-3 are diagrams illustrating the principle of azimuth detection in the amplitude comparison monopulse method. More specifically, Fig. 3-1 shows two antenna patterns with the center direction of the antenna beam shifted, and Fig. 3-2 was received by the antenna of the antenna pattern shown in Fig. 3-1. Fig. 3 is a diagram showing the signal strength of the sum signal ( ⁇ ) and the difference signal ( ⁇ ) generated based on the received signal. Fig. 3-3 shows the sum signal ( ⁇ ) shown in Fig. 3-2. It is a figure which shows the angle error signal produced
- DELTA difference signal
- the amplitude comparison monopulse method uses the output of two antennas that partially overlap each other like the antenna patterns of receiving antenna 1 and receiving antenna 2 shown in Fig. 3-1. An angle error (deviation from the antenna front direction) is detected. Now, when the signal detected by the receiving antenna 1 and the signal detected by the receiving antenna 2 are added, the output characteristics of the sum signal ( ⁇ ) as shown in Fig. 3-2 are obtained. On the other hand, when these detection signals are subtracted, the output characteristics of the difference signal ( ⁇ ) shown in Fig. 3-2 are obtained. This difference signal ( ⁇ ) includes information on the deviation of the target antenna pattern from the central axis received by both receiving antennas.
- the correct side angle cannot be obtained because the signal intensity changes depending on the size of the target and the distance from the target. Therefore, in order to eliminate this variation, by dividing (ie, normalizing) the sum signal ( ⁇ ) that receives the same change as the difference signal ( ⁇ ), it is not affected by this variation.
- the angle error signal shown is obtained.
- This angle error signal is a substantially S-shaped curve. By using this angle error signal, it is possible to detect a deviation from the front direction of the receiving antenna, that is, the arrival angle ⁇ of the received wave.
- the interval between a pair of antennas performing monopulse processing in a general planar antenna configuration is used. It is difficult to arrange at a desired interval (an interval that does not cause phase rotation).
- the size of the antenna itself is reduced, the distance between the pair of antennas can be reduced. In this case, the reduction of the antenna gain leads to a wider angle of the antenna beam and affects the detection performance. The harmful effect of giving is great. Therefore, in order to solve the above problem, it is necessary to reduce the size of the antenna and array the antenna. Although it depends on the frequency band to be used, it is necessary to consider an antenna arrangement that does not cause phase rotation as much as possible when arraying antennas.
- FIG. 4 is a diagram illustrating an antenna configuration of the antenna unit according to the first embodiment.
- the antenna unit of this embodiment has an array of 4 elements arranged at equal intervals in the vertical (elevation) direction and 6 elements at equal intervals (d) in the left and right (azimuth) direction.
- the antenna unit of this embodiment is an array which is three array antennas each including four antenna elements in the elevation direction as one antenna element group and two antenna element groups.
- Antenna A, array antenna B, and array antenna C are configured.
- array antenna A is composed of the first and third antenna element groups from the left
- array antenna B is composed of the second and fourth antenna element groups from the left
- array antenna C Consists of the fifth and sixth antenna elements from the left.
- the distance between the antenna elements constituting the tenor B (or the width of the antenna elements) is 2 d, which is twice as large as the array antenna C. Therefore, the same un
- the beam width of array antenna C is wider than the beam width of array antenna A or array antenna B.
- the configuration of the antenna unit of this embodiment is such that a pair of antenna elements provided in array antenna A and array antenna B are alternately positioned as shown in FIG.
- the configuration is such that a comb array antenna is formed.
- the phase center of array antenna A is near one antenna element group (left antenna element group) of array antenna B
- the phase center of array antenna B is one antenna element group of array antenna A. Since the antenna antenna group on the right side is close to the array antenna A and array antenna B, the distance between the antennas is set to d, which is the same distance as the antenna element spacing.
- FIG. 5 is a diagram illustrating another antenna configuration different from the configuration of FIG. 4 of the antenna unit according to the first embodiment.
- the antenna section 6 shown in the figure four antenna elements in the elevation direction are used as one antenna element group, and three antenna elements are combined, array antenna A and array antenna B. And array antenna C are configured.
- array antenna A is composed of the first, third, and fifth antenna element groups from the left
- array antenna B is composed of the second, fourth, and sixth antenna element groups from the left
- the array antenna C is composed of the seventh to ninth antenna element groups from the left.
- the width of the antenna element group constituting the array antenna C is 2d, and the array antenna
- the spacing force between array antenna A and array antenna B is twice the spacing between array antenna C and has the same relationship as the antenna configuration shown in Fig. 4.
- the phase center of the array antenna A and the phase center of the array antenna B have the same interval as the antenna element interval as in the configuration of the antenna unit shown in FIG. array antenna A and array antenna.
- the antenna unit shown in FIG. 5 is configured to have a function equivalent to that of the antenna unit shown in FIG.
- FIG. 6 is a diagram showing a detection area of each array antenna shown in FIG.
- the beam width of the array antenna C is wider than the beam width of the array antenna A or the array antenna B. Therefore, K1 indicating the detection area of the array antenna C indicates the detection area of the array antenna B. It is wider than K2 and K3 which shows the detection area of array antenna A!
- the detection areas of K2 and K3 are depicted with a slight shift, but this is for convenience of illustration, and these areas are substantially the same.
- the array antenna C is a transmission antenna and monopulse processing is performed by the array antenna A and the array antenna B in the above-described configuration.
- the target azimuth angle existing in the area of the array antenna A can be detected.
- ray antenna C is also used as a receiving antenna.
- the signal is received by the array antenna C, and is not received even when the array antenna A and the array antenna B are misaligned!
- the array antenna A array It turns out that it does not exist in the area of antenna B), that is, near the center.
- a close target In the case of a close target, it may exist within the range of the beam half-width of array antenna A or array antenna B, but even if it is received by the side lobe, it may be detected. However, even in this case, based on the fact that it is received by the array antenna C, it can be determined that this target does not exist near the center.
- the detection area is divided into a plurality of areas that do not cause phase rotation, and the direction of the main beam of each antenna is divided into each of the divided areas. If one of the above two processes is applied while decentering, the correct orientation without ambiguity of the angle can be detected. In addition, by limiting the detection area, the angle accuracy of the detection direction in the detection area can be improved.
- the interval between the antenna element group constituting the array antenna A and the antenna element group constituting the array antenna B is set to be twice the interval between the antenna element groups constituting the array antenna C.
- the antenna elements that are not constrained by the spacing between the antenna element groups are the antenna element group widths that make up the array antenna A and the antenna element group widths that make up the array antenna B are the antenna elements that make up the array antenna C The same effect can be obtained even if it is configured to be twice the group width.
- the beam pattern force of the transmitting antenna should be wider than the beam pattern of the receiving antenna so as to be suitable for the above processing. That is, a transmitting antenna having a wide beam pattern and a pair of receiving antennas having a narrow beam pattern may be configured. It should be noted that it is preferable that the distance between the antenna element groups of each array antenna constituting the pair of reception antennas is set to the same element distance from the viewpoint of making the respective beam patterns the same or equivalent.
- a wide beam array antenna and a plurality of narrow beam array antennas are configured.
- monopulse processing is performed based on the output of a predetermined pair of array antennas among a plurality of narrow beam array antennas! /.
- antenna elements can be effectively arranged in a limited space.
- the mechanism of the antenna section is simplified.
- FIG. 7 is a diagram showing detection areas when the center directions of array antenna A and array antenna B shown in FIG. 6 are decentered to the left and right, respectively.
- the center directions of array antenna A and array antenna B are directed in the same direction.
- the center directions of array antenna A and array antenna B are decentered to the left and right, respectively.
- the configuration of each processing unit including the antenna unit of this embodiment is the same as that of the first embodiment.
- FIG. 7 first, consider a case in which transmission is performed by one of array antenna A, array antenna B, or array antenna C, and monopulse processing is performed by array antenna A and array antenna B. In this case, it is possible to detect the direction of the target existing in the detection area R2, which is near the center of the area. Similarly, if transmission is performed with either array antenna A or array antenna C, and monopulse processing is performed with array antenna A and array antenna C, the target orientation existing in detection area R1 on the left side can be detected. .
- the target orientation existing in the detection area R3 on the right side can be detected.
- a pair of antennas (array antennas A and B) having a narrow beam pattern in which the beam direction is decentered to the left and right in the center direction, and the beam direction toward the center direction. Since the antenna (array antenna C) having a wide beam pattern that covers the beam pattern of each of the pair of antennas is configured on the planar antenna, the arrangement of the antenna elements that constitute the array antenna is reduced. Especially suitable for monopulse processing without changing or special beam synthesis. An antenna beam can be formed.
- this detection area is divided into a plurality of areas that do not rotate around the phase, and each of the divided areas is divided.
- one of the above two processes may be applied while decentering the direction of the main beam of each antenna. In this way, it is possible to detect a correct orientation without ambiguity in angle. Also, by limiting the detection area, the angle accuracy of the detection direction in the detection area can be improved.
- the interval between the antenna element group constituting array antenna A and the antenna element group constituting array antenna B is twice the interval between antenna element groups constituting array antenna C.
- it is not limited by the spacing between the antenna element groups, and the antenna element group width constituting the array antenna A and the antenna element group width constituting the array antenna B constitute the antenna constituting the array antenna C. The same effect can be obtained even if it is configured to be twice the element group width.
- the beam pattern of an array antenna having a wide and beam pattern is roughly the same as the beam pattern of each of a pair of array antennas having a narrow beam pattern in which the beam direction is decentered left and right from the center direction. Constructed to cover! That is, the distance between the antenna element groups of the array antenna having a wide beam pattern and the distance between the antenna element groups of a pair of array antennas having a narrow beam pattern are the amount of left and right beam eccentricity of the array antenna having a narrow beam pattern, Since it is related to the beam pattern of the antenna element itself, the distance between the antenna elements and the antenna element group may be determined based on these elements. It should be noted that the distance between the antenna element groups of each array antenna constituting the pair of array antennas is preferably set to the same element distance from the viewpoint of making the respective beam patterns symmetrical.
- a pair of antennas having a narrow and beam pattern in which the beam direction is decentered left and right or up and down from the center direction, and the beam An array antenna having a wide beam pattern that covers the beam pattern of each of these pair of antennas with the direction toward the center is formed.
- an antenna beam suitable for monopulse processing without particularly changing the arrangement of the antenna elements constituting the array antenna and without performing special beam synthesis.
- FIG. 8 is a diagram illustrating an antenna configuration of the antenna unit according to the third embodiment.
- the space between the second antenna element group and the third antenna element group from the left is slightly increased in the planar array antenna of the first or second embodiment.
- An antenna element is disposed on the side.
- each array antenna is composed of three antenna elements, array antenna D, array antenna E, and array, each consisting of four antenna elements in the elevation direction as antenna element groups and two antenna element groups.
- Configure antenna F The configuration of each of these antennas is different from the configuration of the first embodiment.
- the array antenna F is composed of the first and second antenna elements from the left, and the array antenna E is the third and fourth from the left.
- array antenna F consists of the fifth and sixth antenna elements from the left. Therefore, in such an antenna configuration, the distance between the array antenna D and the array antenna E is d, the distance between the array antenna E and the array antenna F is d, and the array antenna D and the array
- the feed line of one antenna element group (the right antenna element group in the figure) constituting the array antenna F operates under the control of the signal processing unit 20 (not shown).
- a switch mechanism 30 is provided, and the array antenna F is also used as a transmission antenna. If the array antenna F functions as a transmitting antenna, the switch mechanism 30 does not supply power to one antenna element group that constitutes the array antenna F, and the other antenna element group that constitutes the array antenna F ( In the figure, a predetermined radio wave is radiated from the left antenna element group). On the other hand, when the array antenna F functions as a reception antenna, the reception output of the two antenna element groups constituting the array antenna F is output to the output terminal of the antenna F by the switch mechanism 30.
- the antenna F has the same function as the other array antennas D and E. That is, by configuring the antenna section as shown in FIG. 8, the beam pattern of the transmitting antenna can be formed wider than the beam pattern of the receiving antenna, as in the first and second embodiments. .
- any of the six antenna element groups shown in the figure may be used. However, from the viewpoint of securing isolation between the transmission antenna and the reception antenna, In the configuration of the antenna section shown in the figure, it is preferable to use the leftmost antenna element group as a transmission antenna.
- FIG. 9 is a diagram illustrating another feeding state to each antenna element of the antenna unit according to the third embodiment.
- four antenna elements in the elevation direction are grouped as one antenna element group, and power is supplied to each of these antenna element groups. Also good.
- the array antenna F in order to make the array antenna F function as a transmitting antenna and to have the same function as the antenna section shown in Fig. 8, it is a switch that switches power feeding to four antenna elements in the elevation direction. It should be configured to have a mechanism.
- 6 is a graph showing an example of a relationship between an azimuth angle and a phase difference when phase comparison monopulse processing is performed based on a pair of array antennas.
- the curve indicated by the solid line is when the phase comparison monopulse processing is performed based on the combination of array antenna D and array antenna E.
- the curve indicated by the alternate long and short dash line is based on the combination of the array antenna E and the array antenna F
- the curve indicated by the broken line is based on the combination of the array antenna F and the array antenna D.
- the fluctuation period of the phase difference calculated based on the combination of each antenna is different. Therefore, a rough area can be identified by paying attention to the sign of the phase difference obtained for each antenna combination. Now the interval is d
- Phase comparison monopulse processing based on the combination of array antenna F and array antenna D is called ⁇ first monopulse processing '', and similarly, array antenna E with an interval of d
- phase comparison monopulse processing based on the combination of array antenna F and ⁇ second mode Called “no-pulse processing" and the distance between array antenna D and array antenna E
- Phase comparison monopulse processing based on the combination is called "third monopulse processing"
- the sign of the phase difference due to the second and third monopulse processing is positive.
- the sign of the phase difference due to the first monopulse processing is negative.
- 2 3 8 areas can be specified.
- the number of array antennas may be four.
- the number of antenna elements is increased to form a fourth array antenna in addition to the array antennas D, ⁇ , and F, and the distance d between this fourth array antenna and the other array antennas Antenna combinations such that d ⁇ d, d, d
- monopulse processing may be performed.
- array antennas having different antenna intervals may be configured without increasing the number of antenna elements.
- the distance d between the fifth array antenna and the array antenna F There is a relationship of d ⁇ d ⁇ d ⁇ d.
- Monopulse processing may be performed using an antenna.
- the number of array antennas serving as a base for performing these monopulse processes is not limited to three or four as described above, but constitutes five or more array antennas. It goes without saying that monopulse processing based on a plurality of pairs of array antennas combining two antennas is possible.
- the positions of the first, second, and third monopulse processes are as follows. Areas where the signs of all phase differences are all positive are 0 and ⁇ ⁇ as described above, with an azimuth angle of 50 degrees.
- FIG. 11 is a flowchart showing a process flow of the signal processing unit based on the configuration of the antenna unit according to the third embodiment, and is shown to clarify the process flow described above. These processes are performed by the signal processing unit 20 shown in FIG.
- the signal processing unit 20 calculates the phase difference by performing the monopulse side angle for each array antenna set (the combination of the array antennas on which the first, second, or third monopulse processing described above is performed) (Step S 101 ), An area where the target may exist is identified based on the sign of these phase differences (step S102).
- the signal processing unit 20 determines whether or not this potential area is arbitrarily specified (step S103).
- step S107 when the area is uniquely identified (step S103, Yes), the azimuth is calculated based on each phase difference (step S106), and the azimuth is determined (step S107).
- the azimuth angle in step S107 for example, the average value of each angle calculated in step S106 can be adopted.
- a comparison with the detection result of the previous scan may be performed within each angle calculated in step S106, and the closest value may be adopted as the previous result.
- a future position is predicted using speed, acceleration, or the like, a value closest to these predicted positions may be adopted.
- step S104 a narrowing process based on the antenna pattern is performed. This narrowing process is as described above. Then, similarly to the process in step S103, the process again determines whether or not the area is uniquely identified (step S105). If the area is uniquely identified (step S 105, Yes), the process proceeds to step S 106 to determine the azimuth angle. On the other hand, if the area cannot be uniquely identified (step S 105, No), the azimuth is not calculated and determined in this detection process (scan).
- FIG. 12 is a diagram showing an example of a beam pattern of antenna elements that constitute the antenna unit.
- step S104 in FIG. 11 a narrowing process based on the antenna pattern is performed. I explained that. In this process, the antenna pattern is grasped in advance, and the area is specified using the reception level information of the antenna.
- the area where the signs of the phase differences obtained by the first, second, and third monopulse processes are all positive is 0, and ⁇ ⁇ Near 50 degrees
- the arrangement of the antenna can be determined (or determined) based on the beam pattern of the antenna element.
- the degree of freedom of antenna placement may be greater than the degree of freedom of antenna element design. In such a case, it becomes easier to obtain the desired characteristics of the force determined by the antenna arrangement based on the beam pattern of the antenna element, and a flexible design becomes possible.
- a pair of three or more pairs of antennas having two or more different combinations of elements formed by combining two of the three or more antennas configured in the antenna unit Therefore, it is possible to remove the ambiguity caused by the phase shift when performing monopulse signal processing, and to arrange the antenna elements constituting the array antenna. It is possible to form an antenna beam suitable for monopulse processing without special modification and without special beam synthesis.
- FIG. 13 is a flowchart of a process flow of the signal processing unit according to the fourth embodiment.
- an area where a target may exist is identified based on the sign of each phase difference detected by performing a monopulse side angle for each combination of array antennas that perform a plurality of monopulse processes. Later, the azimuth angle where the target exists was calculated, but in this embodiment, an array antenna that performs a plurality of monopulse processes is used.
- Each phase difference is detected for each combination to detect each phase difference, and for each phase difference, an azimuth angle candidate that assumes the presence of the target is calculated, and the azimuth angle candidate is selected from among targets having the same speed and the same distance. It is characterized by selecting those that match.
- the configuration of each processing unit including the antenna unit of this embodiment is the same as that of the third embodiment.
- the signal processing unit 20 performs predetermined processing including the monopulse side angle processing as the monopulse radar device for each signal force of the array antennas D and E to calculate the target distance, velocity, and phase difference X, and the target exists.
- a candidate azimuth angle ⁇ (X) corresponding to the phase difference X is calculated as a possible azimuth angle (step S)
- azimuth angle candidates ⁇ (y) corresponding to phase difference y based on array antennas E and F step S202
- the output azimuth includes distance, speed, and speed
- step S 204 From the data group of the same distance and the same speed that are the same as the degree, the one that matches 0 (X), ⁇ (y), ⁇ (z) calculated in steps S201 to S203 is selected (step S 204).
- FIG. 14 is a diagram showing three candidate examples of target azimuth angles calculated based on the combination of array antennas D and E on the graph shown in FIG.
- the target target phase difference is 90 degrees among the multiple targets detected by the combination of array antennas D and E
- three azimuth angles are used as azimuth angle candidates ⁇ .
- PI, P2, and P3 are calculated.
- the azimuth angle candidate ⁇ and azimuth angle are selected from the data group in which the distance and speed of the target target are within the range of the predetermined distance accuracy and speed accuracy. Select the candidate 0 that matches with the specified accuracy. Similar processing
- the processing of steps S201 to S203 shown in FIG. 13 may be started from any processing.
- the force is not limited to three sets of forces for specifying the azimuth angle based on the three pairs of array antennas.
- the azimuth is determined by using two or more pairs of array antennas. Identify corner can do.
- the monopulse radar device of this embodiment two or more pairs of antennas having two or more different element spacings, combining two of the three or more antennas configured in the antenna section. Therefore, it is possible to remove the ambiguity caused by the phase shift when performing monopulse signal processing, and to arrange the antenna elements constituting the array antenna. It is possible to form an antenna beam suitable for monopulse processing without special modification and without special beam synthesis.
- FIG. 15-1 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface and the antenna element group of the antenna section shown in FIG.
- This figure also shows a schematic antenna beam from three array antennas (array antennas D, ⁇ , and F) each composed of two antenna element groups.
- FIG. 15-2 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface of the antenna unit and the antenna element group according to the fifth embodiment.
- V is a force that also shows a schematic antenna beam from three array antennas (array antennas D, ⁇ , and F) each composed of two antenna element groups.
- the tenor beam is substantially the same as the antenna beam shown in Figure 15-1.
- FIG. 15-2 In the antenna section shown in Fig. 2, when the array surface of the antenna elements (or antenna element groups) constituting the array antenna E is defined as the “reference array surface”, the array surface of the antenna elements configuring the array antenna D is defined as the reference array surface. Only a predetermined tilt angle ( ⁇ ) to the right of azimuth
- the array surface of the antenna elements constituting the array antenna F is inclined by a predetermined tilt angle (a) to the left of the azimuth with respect to the reference array surface.
- the beam center direction without performing the directivity synthesis between the antenna element groups is determined from the beam center direction by the array antenna ⁇ .
- Power S can be.
- the beam center direction is rotated by a predetermined eccentric angle (a) from the beam center direction by the array antenna ⁇ to the left side of the azimuth without performing beam synthesis between the antenna element groups. be able to.
- a plurality of beams as shown in the figure can be formed by combining beams between antenna element groups constituting each array antenna. Due to interference between groups and a slight increase in side lobes, there is a disadvantage that it is difficult to obtain stable characteristics over the entire detection range.
- the configuration shown in Fig. 15-2 although the manufacturing man-hour (tact) is slightly increased, the side lobe can be easily controlled, and stable characteristics can be obtained over the entire detection range. it can.
- one of the main beam directions is decentered to the center direction force leftward or upward.
- the array surface of the antenna elements constituting the array antenna is arranged with a predetermined inclination angle leftward or upward with respect to the reference array surface, and the main beam direction of the three or more pairs of array antennas Center direction force Arrange the array surface of the antenna elements constituting the other array antenna eccentric to the right or downward direction so that it is tilted by a predetermined inclination angle to the right or downward direction with respect to the reference array surface. Therefore, it is not necessary to synthesize directivity between antenna element groups. Can be controlled easily and stable characteristics can be obtained over the entire detection range.
- each beam center direction of array antennas D and F is set to a predetermined eccentric angle ( ⁇ ) in the azimuth right direction or azimuth left direction, respectively.
- ⁇ eccentric angle
- the array surface of the antenna elements to be tilted by the same angle ( ⁇ ) in each direction
- the tilt angle should be set so that the side lobes of each array antenna can be controlled easily and stable characteristics can be obtained over the entire detection range.
- the force is such that the antenna elements are arranged on an inclined surface inclined in accordance with the direction of the center of the beam on the surface having a predetermined curvature, a spherical surface, or an ellipse. Even if it is arranged on a surface such as a spherical surface, the same effect as described above can be obtained.
- FIG. 16-1 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface and the antenna element group of the antenna section shown in FIG.
- schematic antenna beams Ml, M2, and M3 corresponding to each of the three array antennas A, ⁇ , and C each constituted by two antenna element groups are also shown.
- FIG. 16-2 is a cross-sectional view showing a schematic shape in an orthogonal cross section orthogonal to both the antenna element array surface and the antenna element group of the antenna unit according to the sixth embodiment.
- the general antenna beams Ml, M2, M3 corresponding to each of the three array antennas A, B, C) each composed of two antenna element groups are also shown. These antenna beams are substantially the same as the antenna beams shown in Figure 16-1.
- array antenna A is composed of the first and third antenna elements from the left
- array antenna B is the second and fourth from the left
- the array antenna C is composed of the 5th and 6th antenna elements from the left.
- the array antenna B is configured.
- the antenna elements to be arranged that is, the arrangement plane of the first and third antenna elements from the left, is a predetermined inclination angle ( ⁇ ) in the azimuth left direction with respect to the reference arrangement plane
- the antenna elements constituting the array antenna ⁇ that is, the arrangement plane of the second and fourth antenna element groups from the left, have a predetermined inclination angle ( ⁇ ) Only tilted.
- Power S can be.
- the array antenna ⁇ it is possible to rotate the beam center direction of the antenna antenna group by a predetermined eccentric angle (a) from the beam center direction by the array antenna C to the right without performing beam synthesis between the antenna element groups. it can.
- a plurality of beams as shown in the figure can be formed by beam combining between antenna element groups constituting each array antenna. Due to interference between groups and a slight increase in side lobes, there is a disadvantage that it is difficult to obtain stable characteristics over the entire detection range. In contrast, with the configuration shown in Figure 16-2, although the manufacturing man-hours (tact) are slightly increased, the side lobe can be easily controlled and stable characteristics can be obtained over the entire detection range. it can.
- one of the main beam directions is decentered in the center direction force leftward or upward.
- the array elements of the antenna elements constituting the array antenna are arranged with a predetermined inclination angle leftward or upward with respect to the reference array surface, and the main beam direction of the predetermined pair of array antennas is centered.
- each beam center direction of array antennas A and B is set to a predetermined eccentric angle ( ⁇ ) in the azimuth left direction or azimuth right direction, respectively.
- ⁇ eccentric angle
- the array surface of the antenna elements to be tilted by the same angle ( ⁇ ) in each direction
- the tilt angle should be set so that the side lobes of each array antenna can be controlled easily and stable characteristics can be obtained over the entire detection range.
- Embodiments 1 to 6 have described several embodiments that are effective for monopulse radar devices using array antennas in which antenna elements are effectively arranged in a limited space.
- the antenna switching switch 12 shown in FIG. it is necessary to perform the switching via, for example, the antenna switching switch 12 shown in FIG. It is necessary to send necessary control signals from the generator 19 to the antenna switching switch 12 and the receiver. Therefore, in this embodiment, for example, an example of an embodiment according to the configuration of the antenna switching switch 12 shown in FIG. 1 and the control signal output from the antenna switching signal generator 19 will be described.
- an on-vehicle radar device equipped with an FM-CW radar that measures the distance and relative velocity with a target using a radio wave modulated with a triangular wave is used as an example.
- the installation location is limited due to the characteristics of the vehicle, which is an on-board platform, while the price of the vehicle increases due to securing competitiveness with competitors. Therefore, it is required to reduce the installation area of a plurality of antennas to be mounted and the number of high-frequency components required for a transmission / reception unit to reduce the size and weight. Further, downsizing and weight reduction of the device are not limited to the on-vehicle radar device, and can be an effective technique for various radar devices. Therefore, the antenna switching switch that is useful in this embodiment is positioned as a technique for realizing further downsizing and light weight of the radar apparatus, and the configuration and operation thereof will be described below.
- FIG. 17 shows an in-vehicle FM—CW to which the antenna switching switch according to the seventh embodiment is applied.
- a transmission signal that has been FM-modulated with a triangular wave output from a voltage controlled oscillator (VCO) 110 is multiplied to a millimeter wave band by a multiplier (MLT) 112, amplified by a transmission amplifier 114, and then switched to an antenna switching switch.
- VCO voltage controlled oscillator
- MKT multiplier
- the signal is input to 113, and is transmitted from the antenna ATO through the amplifier 115 and the switch 116 in the antenna switching switch 113.
- the antenna ATO is used for transmission among the three antennas ATO, ATI, and A T2, and the reception is performed among the three antennas AT 0, ATI, and AT2.
- the one selected by switch 122 is used.
- a switch 121 is provided between the antenna AT0 and the amplifier 124 to prevent the transmission signal from wrapping around to the reception side. It should be noted that the switches 116 and 121 are not necessarily required when the sneaking to the receiving side can be prevented by another means.
- the received signal received by each antenna is amplified by amplifier 124, selected by switch 122, amplified by reception amplifier 126, and mixed with a part of the transmission wave by mixer 128 to generate a beat signal.
- the beat signal generated by the mixer 128 is converted into a digital signal by the AZD comparator (ADC) 132, converted by the FFT processor 134 to a high-speed file, and input to the CPU 36.
- the mixer 131 is provided for canceling the frequency superimposed on the beat signal by mixing the same frequency with the control signal SWR for switching transmission / reception.
- ON / OFF of switch 116 and ON / OFF of amplifier 115 by turning ON / OFF the bias voltage of amplifier 115 are linked, and selection of switches 121 and 122 and ON / OFF of amplifier 124 are And are linked.
- FIG. 18 shows the waveform of a triangular wave input to the voltage controlled oscillator 10 of FIG. 17, and the (A) to (C) columns of FIG. 19 respectively indicate the control signal SWT in the section indicated by A to C of FIG. , SWR, SWO, SW1, SW2 waveforms.
- the time scale on the horizontal axis in FIG. 18 is significantly compressed compared to FIG.
- the transmission signal amplified by the first amplifier is supplied to one antenna via the second switch, and one antenna
- the output of the second amplifier that amplifies the received signal of the antenna and the output of the plurality of third amplifiers that amplify the received signals of other antennas are selected and received by the first switch. Therefore, the antenna switching switch, which is a component part of the radar device, can be made smaller and lighter.
- switches are used to reduce the number of antennas by using both antennas for transmission and reception, and to reduce the number of high-frequency components required for the transmission / reception unit by processing the reception signals of a plurality of reception antennas in common. If the switch is used, it is preferable to place the amplifier as close to the antenna as possible. [0114] Even if the number of antennas is reduced by sharing multiple receiving antennas, the number of switches increases when all antennas are shared, and the number of necessary amplifiers increases accordingly. Therefore, one of the multiple receiving antennas is fixedly used for both transmission and reception, thereby preventing or reducing the deterioration in the performance of the radar device when reducing the size and weight of the radar device. Can do.
- the monopulse radar device that is useful in the present invention is useful as a radar device that detects the distance, velocity, and direction of a moving object, and particularly when there is a space restriction on the antenna system. It is also suitable when you want to make the antenna system mechanism simple. Moreover, the antenna switching switch according to the present invention contributes to the reduction in size and weight of the radar apparatus.
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN2005800237410A CN1985187B (zh) | 2004-07-16 | 2005-07-15 | 单脉冲雷达装置及天线切换开关 |
EP05766362.7A EP1788408B1 (en) | 2004-07-16 | 2005-07-15 | Mono pulse radar device and antenna selector switch |
US11/630,040 US7612706B2 (en) | 2004-07-16 | 2005-07-15 | Monopulse radar apparatus and antenna switch |
JP2006529198A JPWO2006009122A1 (ja) | 2004-07-16 | 2005-07-15 | モノパルスレーダ装置およびアンテナ切換スイッチ |
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JP2004-210440 | 2004-07-16 | ||
JP2004210440 | 2004-07-16 | ||
JP2004228323 | 2004-08-04 | ||
JP2004-228323 | 2004-08-04 |
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PCT/JP2005/013183 WO2006009122A1 (ja) | 2004-07-16 | 2005-07-15 | モノパルスレーダ装置およびアンテナ切換スイッチ |
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US (1) | US7612706B2 (ja) |
EP (1) | EP1788408B1 (ja) |
JP (1) | JPWO2006009122A1 (ja) |
CN (1) | CN1985187B (ja) |
WO (1) | WO2006009122A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP1788408A1 (en) | 2007-05-23 |
US7612706B2 (en) | 2009-11-03 |
JPWO2006009122A1 (ja) | 2008-05-01 |
CN1985187A (zh) | 2007-06-20 |
EP1788408B1 (en) | 2014-03-05 |
CN1985187B (zh) | 2012-05-16 |
EP1788408A4 (en) | 2013-01-16 |
US20070182619A1 (en) | 2007-08-09 |
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