JP2011257350A - Radar device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radar device of a phased array system having a multiple face structure, which is reliable enough to respond to malfunction of any of the radiation faces, and is multifunctional in its operation.SOLUTION: The radar device capable of searching for all the circumferential direction with a non-rotation phased array system includes: an antenna section in which a plurality of antenna faces of phased array antennas (antennas 1a, 1b, 1c, 1d, 1e, 1f) form a polyhedron and a prescribed direction is included in a covering area where at least two antenna faces among the plurality of antenna faces can search; one or more transceivers 2 that select any of the plurality of antenna faces possessed by the antenna section, transmit a transmitter signal and receive a reception signal via the selected antenna face; one or more beam generation units 3 that are provided corresponding to each of one or more transceivers 2 and generate a reception beam on the basis of the reception signal received by the transceivers 2; and a radar signal processing unit 4 that detects the target by processing signals on the basis of the reception beam generated by the beam generation units 3.

Description

  Embodiments described herein relate generally to a radar apparatus that searches the entire circumference (azimuth 360 degrees) by a non-rotating phased array system.

  Conventional radar devices generally detect a target by emitting radio waves in space and receiving reflected waves from the target to obtain position and velocity information, etc., and all areas that need to be monitored The beam is scanned while changing the azimuth angle, elevation angle, and the like. As the azimuth direction in the monitoring range, only a limited azimuth angle may be determined or an all-round search may be performed depending on the application of the radar apparatus.

  Radar devices that search the entire circumference are roughly classified into rotary and non-rotary types. As the rotary search radar, a reflector type or planar array type antenna having a full circumference by combining it with a drive system has been put into practical use. Such a rotary radar device has a merit of low cost by configuring an antenna with a small number of elements because it has a full circumference by incorporating a mechanical drive system, but on the other hand, Since the search range is limited to the direction in which it is mechanically oriented (only the front if the reflector method is used), it is not suitable as a multi-function radar.

  A non-rotating search radar is a phased array radar device that has a plurality of radiation surface structures (triangle or quadrangle as viewed from above) and electronically scans the beam regardless of mechanical rotation. Search all around. Such a non-rotating radar device naturally has a demerit that the number of elements is larger than that of a rotating type and the cost is higher, but on the other hand, the radar pointing direction does not depend greatly on the mechanical rotating direction. Since it is determined by electronic scanning, it is possible to configure a radar having a greater degree of freedom compared to the rotary type in tracking processing or the like that continues to irradiate a beam to a specific target.

JP 2007-178332 A

Published by Asunou Shimbun “Self-Defense Forces Yearbook 2009-2010”, July 17, 2009

  As described above, as a multi-function radar, it is usual to employ a non-rotating phased array type multi-plane structure radar device, which has three radiation surfaces (a triangular shape when viewed from the sky) and four radar devices. A ship-borne radar or the like is known (having a square shape when viewed from above). When searching for the entire circumference, these radar devices are basically in charge of 120 degrees for each antenna in the case of a triangular structure, and 90 degrees for each antenna in the case of a quadrilateral structure. The coverage of the entire circumference (360 degrees) is obtained by switching over time.

  However, considering that the scanning width of the normal phased array antenna is 120 degrees (± 60 degrees) at most, the radar apparatus having the triangular antenna has a 360 degree by making the best use of the scanning performance. Coverage can be obtained, but each antenna cannot supplement the range other than its own monitoring range. In addition, a radar apparatus having a square antenna can secure some overlap with adjacent antennas, but adjacent antennas cannot completely complement each other.

  Therefore, if one of the radiation surfaces breaks down, it is not possible to search for the monitoring range of the radiation surface where another radiation surface is broken, and it is necessary to replace the broken radiation surface with a normal radiation surface. There is.

  The present invention solves the above-mentioned problems of the prior art, and in a phased array type radar apparatus having a multi-plane structure, in terms of high reliability and operation that can cope with any radiation surface failure or the like. It is an object to provide a radar device having multiple functions.

  In order to solve the above-described problem, the radar apparatus according to the embodiment is a radar apparatus capable of searching in the entire circumferential direction by a non-rotating phased array method, and a plurality of antenna surfaces formed by the phased array antenna form a polyhedron. In addition, an antenna part that includes a predetermined direction in a coverage area in which at least two antenna surfaces of the plurality of antenna surfaces can be searched, and the plurality of antenna surfaces that the antenna part has are selected, and the selected antenna One or more transmission / reception units that transmit a transmission signal and receive a reception signal via a plane, and the one or more transmission / reception units are provided corresponding to the reception signals received by the transmission / reception unit. One or more beam forming units that form a beam and a signal processing based on the received beam formed by the beam forming unit Characterized in that it comprises a radar signal processing unit that performs output.

It is a block diagram which shows the structure of the radar apparatus of the form of Example 1. FIG. It is a figure which shows the image of the all-around search by the radar apparatus of the form of Example 1. FIG. It is a figure explaining the complement by the adjacent antenna of the radar apparatus of the form of Example 1. FIG. It is another figure explaining the complementation by the adjacent antenna of the radar apparatus of the form of Example 1. FIG. It is a figure explaining the operation | use case which applied sector search with respect to the area | region to which attention is paid in the radar apparatus of the form of Example 1. FIG. It is a block diagram which shows the structure of the radar apparatus of the form of Example 2. FIG. It is a figure which shows the image of 2 surface simultaneous transmission / reception by the radar apparatus of the form of Example 2. FIG.

  Hereinafter, embodiments of a radar apparatus according to the present invention will be described in detail with reference to the drawings.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of a radar apparatus according to Embodiment 1 of the present invention. The radar apparatus according to the present embodiment is a radar apparatus capable of searching in the entire circumferential direction by a non-rotating phased array system. As shown in FIG. 1, antennas 1a, 1b, 1c, 1d, 1e, and 1f are transmitted and received. Machine 2, beam forming unit 3, radar signal processing unit 4, and display unit 5.

  Each of the antennas 1a, 1b, 1c, 1d, 1e, and 1f constitutes an antenna surface by a phased array antenna in which a plurality of antenna elements are arranged, and radiates a transmission signal from a transmitter / receiver 2 described later as a radio wave to the space. The reflected signal is received as a received signal. Further, the antennas 1a, 1b, 1c, 1d, 1e, and 1f are integrally formed and correspond to the antenna part of the present invention as a whole, and a plurality of antenna surfaces formed by the phased array antenna form a polyhedron, The direction is included in the covered area where at least two antenna surfaces of the plurality of antenna surfaces can be searched.

  Furthermore, it is assumed that the antenna portion of the present invention has six or more antenna surfaces, and N antennas are formed by N antenna surfaces. In the present embodiment, the aerial part of the radar apparatus forms a hexagonal shape with six antenna surfaces of the aerial lines 1a, 1b, 1c, 1d, 1e, and 1f.

  The transceiver 2 corresponds to the transmission / reception unit of the present invention, selects any one of a plurality of antenna surfaces (aerial lines 1a, 1b, 1c, 1d, 1e, and 1f) of the antenna unit, and passes through the selected antenna surface. A transmission signal is transmitted and a reception signal is received. In carrying out the present invention, it is sufficient that there is one or more transmission / reception units, and there may be a plurality of transmission / reception units. However, the transmission / reception unit in the present embodiment is configured by one transceiver 2.

  The transceiver 2 generates and transmits a transmission signal at a predetermined repetition period. For example, when searching in the entire circumference direction, the transmitter / receiver 2 first selects the antenna 1a and performs beam scanning in a range where the antenna 1a can be searched at a predetermined repetition period. When this is finished, the transceiver 2 selects the antenna 1b and performs beam scanning in a range where the antenna 1b can be searched at a predetermined repetition period. In this way, the transceiver 2 sequentially performs the same operation for all antennas.

  The beam forming unit 3 is provided corresponding to one or more transmission / reception units (transceiver 2 in the present embodiment), and forms a reception beam based on a reception signal received by the transmission / reception unit 2. Since the number of beam forming units of the present invention is one or more and is provided corresponding to the transmitting / receiving units, the number is basically equal to the number of transmitting / receiving units. Since the radar apparatus according to this embodiment includes only one transmitter / receiver 2, the radar apparatus includes one beam forming unit 3 correspondingly.

  The beam forming operation of the reception beam by the beam forming unit 3 is the same as that performed for a conventional phased array antenna, and reception having an arbitrary directivity by controlling the phase and amplitude of each antenna element. A beam can be formed.

  The radar signal processing unit 4 performs target processing by performing signal processing based on the received beam formed by the beam forming unit 3, and when a target is detected, information such as the distance to the target and the direction can be obtained. it can.

  The display unit 5 is, for example, a display and displays information on the target detected by the radar signal processing unit 4 on the screen.

  Next, the operation of the present embodiment configured as described above will be described. FIG. 2 is a diagram illustrating an image of an all-round search performed by the radar apparatus according to the first embodiment of the present invention. Fig.2 (a) is the figure which represented typically the antenna part at the time of seeing from the sky. As shown in FIG. 2A, the antenna portion in the radar apparatus of the present embodiment forms a hexagonal shape with six antenna surfaces of the antennas 1a, 1b, 1c, 1d, 1e, and 1f. Each of the antennas 1a, 1b, 1c, 1d, 1e, and 1f is basically in charge of 60 degrees of azimuth as a search range. That is, the radar apparatus according to the present embodiment can perform a search of 60 × 6 = 360 degrees (that is, the entire circumference) by forming a hexagon with six antennas.

  FIG. 2B is a diagram illustrating an operation in the basic search mode by the radar apparatus according to the first embodiment of the present invention. First, the transceiver 2 selects the antenna 1a from a plurality of antenna surfaces (antennas 1a, 1b, 1c, 1d, 1e, and 1f) of the antenna unit, and transmits a transmission signal through the selected antenna 1a. Receive a received signal. Specifically, the transmitter / receiver 2 performs beam scanning with respect to an azimuth of 60 degrees that is the basic search range of the antenna 1a while slightly shifting the angle at a predetermined repetition period. Further, the transceiver 2 receives the signal reflected by the target as a reception signal via the antenna 1 a and outputs it to the beam forming unit 3. The beam forming unit 3 forms a reception beam based on the reception signal received by the transceiver 2 and outputs it to the radar signal processing unit 4. The radar signal processing unit 4 performs target processing by performing signal processing based on the received beam formed by the beam forming unit 3, and when a target is detected, obtains information such as a distance to the target and an azimuth. The display unit 5 displays information on the target detected by the radar signal processing unit 4 on the screen.

  When the beam scanning for the azimuth 60 degrees that is the basic search range of the antenna 1a is completed, the transceiver 2 selects the antenna 1b and performs the same operation as when the antenna 1a is selected. In this way, the transceiver 2 sequentially performs the same operation for all antennas. If the same operation is completed up to the antenna 1f, the all-round search is completed. However, as shown in FIG. 2B, the operation using the antenna 1a may be returned to.

  The above operation is a basic search pattern, but the radar apparatus of the present embodiment can also perform a search so as to complement the adjacent antenna (antenna surface). As described above, the antennas 1a, 1b, 1c, 1d, 1e, and 1f in the radar apparatus according to the present embodiment include a predetermined direction in a covered area where at least two antenna surfaces can be searched among a plurality of antenna surfaces. That is, each of the antennas 1a, 1b, 1c, 1d, 1e, and 1f has a structure capable of scanning 120 degrees as a scanning range (element interval). Here, the scannable range is a parameter determined by the element interval. Therefore, it can be said that the search range of a certain surface (one antenna) can be supplemented by two adjacent surfaces (two antennas).

  FIG. 3 is a diagram for explaining complementation by adjacent antennas in the radar apparatus according to the first embodiment of the present invention. As shown in FIG. 3, when the aerial line 1a is scanned 120 degrees in the clockwise direction, the direction is the boresight (front) direction of the aerial line 1b. Similarly, when the aerial line 1c is scanned 120 degrees counterclockwise in the same manner, the direction thereof becomes the boresight direction of the aerial line 1b. Therefore, as shown in FIG. 3, the coverage of the antenna 1b can be complemented by the antenna 1a and the antenna 1c.

  FIG. 4 is another diagram for explaining the complement by the adjacent antenna in the radar apparatus according to the first embodiment of the present invention. As described above, each antenna has a basic search range of 60 degrees, but can search at a maximum of 120 degrees, so that it is possible to cover a search range of half of the adjacent antennas. That is, as shown in FIG. 4, the basic search range of the antenna 1a can also be searched by the antenna 1f and the antenna 1b. Similarly, the basic search range of the antenna 1b can also be searched by the antenna 1a and the antenna 1c. The basic search range of the antenna 1c can also be searched by the antenna 1b and the antenna 1d. The basic search range of the antenna 1d can also be searched by the antenna 1c and the antenna 1e. The basic search range of the antenna 1e can also be searched by the antenna 1d and the antenna 1f. The basic search range of the antenna 1f can also be searched by the antenna 1e and the antenna 1a.

  As described above, the aerial part in the radar apparatus according to the present embodiment has a hexagonal structure, and thus has twice the degree of freedom with respect to the azimuth space, so that various advantages can be obtained. The reason why the antenna part of the present invention has six or more antenna surfaces and the N antennas are formed by N antenna surfaces is that the limit of the scanning width of a general phased array antenna is about 120 degrees. It is assumed that. That is, when the number of antenna surfaces is 5 or less, even if a pentagon, a quadrangle, or the like is formed on these antenna surfaces, adjacent antennas cannot cover the entire search range. Note that the limit of the scan width is closely related to the generation of grating lobes and the amount of gain reduction. However, when the demand for these is severe, the scan width is generally narrow, and this example shows When the scanning width is 120 degrees, it is a hexagon, but when it is 102 degrees, it is a pentagon, and when it is 90 degrees, it is an octagon.

  The number of antenna surfaces can be realized as long as it is 6 or more as described above. However, since there are restrictions on the power supply capacity, cost, etc., it is considered that the hexagonal structure with the minimum six antenna surfaces is optimal. . Of course, you may provide the antenna part which has seven or more antenna surfaces according to the use and embodiment of a radar apparatus.

  By providing the antenna unit having a hexagonal structure, the radar apparatus of the present embodiment can perform the following operations, for example. First, it is assumed that one of the plurality of antenna surfaces (aerial lines) (here, the aerial line 1b) has failed. First, the transceiver 2 selects the antenna 1a from a plurality of antenna surfaces (antennas 1a, 1b, 1c, 1d, 1e, and 1f) of the antenna unit, and transmits a transmission signal through the selected antenna 1a. Receive a received signal. Specifically, the transmitter / receiver 2 performs beam scanning with respect to an azimuth of 60 degrees that is the basic search range of the antenna 1a while slightly shifting the angle at a predetermined repetition period. Further, the transceiver 2 performs beam scanning for half of the basic search range of the antenna 1b by scanning 30 degrees clockwise.

  The reception / output of the received signal by the transceiver 2 and the operations of the beam forming unit 3, the radar signal processing unit 4 and the display unit 5 are the same as those described above.

  When the beam scan for the azimuth 60 degrees, which is the basic search range of the antenna 1a, and the azimuth 30 degrees (90 degrees in total), which is half of the basic search range of the antenna 1b, is completed, the transceiver 2 selects the antenna 1c. Then, beam scanning is performed for an azimuth of 60 degrees, which is the basic search range of the antenna 1c. Furthermore, the transmitter / receiver 2 performs beam scanning for half of the basic search range of the antenna 1b by scanning 30 degrees counterclockwise.

  That is, the aerial line 1a scans 30 degrees more clockwise and the aerial line 1c scans 30 degrees more counterclockwise, so that the aerial line 1a and the aerial line 1c cover the front (boresight) direction of the aerial line 1b. can do.

  Thereafter, the transceiver 2 sequentially performs the same operation as the above-described basic search pattern for the antennas after the antenna 1d.

  As described above, the aerial line 1a and the aerial line 1c are responsible for half of the search range of the aerial line 1b in addition to their own basic search range. Even if you are in an impossible situation, you can search all around without any problems.

  As described above, according to the radar apparatus according to the first embodiment of the present invention, in the phased array type radar apparatus having a multi-plane structure, it is possible to cope with a case where one of the radiation surfaces breaks down. Can be realized.

  That is, in the radar apparatus of the present embodiment, since the aerial part has a hexagonal structure with six antenna surfaces, adjacent aerial lines cover each other, so that the degree of freedom is doubled with respect to the azimuth space. Even if one antenna falls into a situation where it cannot be used due to a failure or the like, the all-round searchability can be ensured.

  Next, a radar apparatus according to Embodiment 2 will be described. As described above, the radar system is roughly divided into a rotary type and a non-rotational type. Here, in the rotary radar device, the front direction of the aerial is determined by the rotation axis. Therefore, the tracking beam is applied in an arbitrary direction when the target of interest is monitored, and other than search beams such as image radar However, there is a problem that the direction of the rotation axis is restricted. On the other hand, a non-rotating radar apparatus can also apply a tracking beam or an image radar in such a way as to interrupt the search beam.

  FIG. 5 is a diagram for explaining an operation case in which a sector search (a beam with a limited azimuth search width) is applied to a region of interest in the radar apparatus according to the first embodiment of the present invention. First, the transceiver 2 selects the antenna 1a from a plurality of antenna surfaces (antennas 1a, 1b, 1c, 1d, 1e, and 1f) of the antenna unit, and transmits a transmission signal through the selected antenna 1a. Receive a received signal. This operation is as described in the first embodiment. Here, it is assumed that the radar apparatus has detected the target. When the beam scanning for the azimuth 60 degrees that is the basic search range of the antenna 1a is completed, the transceiver 2 selects the antenna 1b and performs the same operation as when the antenna 1a is selected. However, during the search using the antenna 1b, the transceiver 2 temporarily selects the antenna 1a and tracks the detected target using the tracking beam. Thereafter, the transceiver 2 selects the antenna 1b again, and performs beam scanning on the remaining search range in the antenna 1b.

  Similarly, the transmitter / receiver 2 intermittently applies the tracking beam by the antenna 1a even when searching for the antennas 1c, 1d, 1e, and 1f, and searches the entire circumference while ensuring a high tracking rate for the target of interest. It can be performed. An image radar may be applied instead of the tracking beam. In this case, the radar apparatus can obtain the target image using the ISAR at the same time as performing the entire search.

  As described above, the radar apparatus adopting the non-rotating phased array method and the time division beam scheduling can apply sector search or ISAR for an arbitrary direction at an arbitrary time. However, since the sector search or the like is added in addition to the conventional all-round search, the time required to search the entire circumference (360 degrees) is extended.

  FIG. 6 is a block diagram illustrating a configuration of the radar apparatus according to the second embodiment of the present invention. The radar apparatus according to the present embodiment is a radar apparatus capable of searching in all directions by a non-rotating phased array system. As shown in FIG. 6, antennas 1a, 1b, 1c, 1d, 1e, and 1f are transmitted and received. Machine 2a, 2b, beam forming units 3a, 3b, radar signal processing units 4a, 4b, and display unit 5. That is, the difference from the radar apparatus of the first embodiment is that two transceivers, two beam forming units, and two radar signal processing units are provided.

  Each of the two transceivers 2a, 2b corresponds to the transceiver unit of the present invention, and selects and selects one of a plurality of antenna surfaces (aerial lines 1a, 1b, 1c, 1d, 1e, 1f) of the antenna part A transmission signal is transmitted and a reception signal is received through the antenna surface. At that time, each of the two transceivers 2a and 2b selects a different antenna surface from the plurality of antenna surfaces. The radar apparatus of this embodiment performs two-surface simultaneous transmission / reception using two antenna surfaces selected by the two transmitter / receivers 2a and 2b.

  In implementing the invention of the radar apparatus shown in the present embodiment, any number of transmission / reception units may be provided, but the transmission / reception unit in the present embodiment is configured by two transceivers 2a and 2b. And In addition, when a plurality of transmission / reception units are provided, each of the plurality of transmission / reception units selects a different antenna surface from among the plurality of antenna surfaces.

  The beam forming units 3a and 3b are provided corresponding to one or more transmission / reception units (transceivers 2a and 2b in the present embodiment). The beam forming unit 3a forms a reception beam based on the reception signal received by the transceiver 2a. On the other hand, the beam forming unit 3b forms a reception beam based on the reception signal received by the transceiver 2b.

  The radar signal processing unit 4a performs target detection by performing signal processing based on the reception beam formed by the beam forming unit 3a, and when a target is detected, information such as the distance to the target and the direction can be obtained. it can. On the other hand, the radar signal processing unit 4b performs target detection by performing signal processing based on the reception beam formed by the beam forming unit 3b, and obtains information such as the distance and direction to the target when the target is detected. be able to.

  The display unit 5 is, for example, a display, and displays information on the target detected by the radar signal processing units 4a and 4b on the screen.

  Other configurations are the same as those of the first embodiment, and redundant description is omitted.

  Next, the operation of the present embodiment configured as described above will be described. FIG. 7 is a diagram illustrating an image of two-surface simultaneous transmission / reception by the radar apparatus according to the second embodiment of the present invention. FIG. 7A is almost the same as the diagram described in FIG. 3, but a normal all-around search using other antennas can be performed while the antenna 1b is performing a sector search using a tracking beam. Is shown. The power supply capacity for two-surface simultaneous transmission is allowed, and the radar apparatus of the present embodiment including two transceivers 2a and 2b as shown in FIG. 6 realizes multi-functionality in the operational aspect described below. be able to.

  FIG. 7B is a diagram illustrating an operation performed by the radar apparatus according to the second embodiment of the present invention. First, the transceiver 2a selects the antenna 1a from a plurality of antenna surfaces (antennas 1a, 1b, 1c, 1d, 1e, and 1f) of the antenna unit, and performs beam scanning through the selected antenna 1a. When the beam scanning is completed for the azimuth 60 degrees that is the basic search range of the antenna 1a, the transceiver 2a selects the antenna 1b and performs the beam scanning through the selected antenna 1b. Here, if a target is detected, the transceiver 2 a receives the signal reflected by the target as a reception signal via the antenna 1 b and outputs it to the beam forming unit 3. The beam forming unit 3a forms a received beam based on the received signal received by the transceiver 2a and outputs the received beam to the radar signal processing unit 4a.

  The radar signal processing unit 4a performs signal processing based on the reception beam formed by the beam forming unit 3a, and obtains information such as the distance to the target and the direction. At that time, the radar signal processing unit 4a causes the transceiver 2a to search the sector by the tracking beam via the beam forming unit 3a, and outputs the search result by the antenna 1b to the radar signal processing unit 4b.

  The radar signal processing unit 4b transmits the search result of the antenna 1b to the transceiver 2b via the beam forming unit 3b, and starts the continuation of the all-round search using the antenna 1c. In other words, the antenna 1c takes over the all-round search that the antenna 1b was supposed to perform. Specifically, while the antenna 1b is searching for a sector, the transceiver 2b selects the antenna 1c, and performs beam scanning of the range that the antenna 1b was originally supposed to perform via the selected antenna 1c. Thereafter, beam scanning is performed in the basic search range of the antenna 1c.

  When the beam scanning is completed for the basic search range of the antenna 1c, the transceiver 2b sequentially selects the antennas 1d, 1e, and 1f, and performs the entire circumference search by performing the beam scanning through the selected antenna. On the other hand, the transceiver 2a intermittently searches for a sector via the antenna 1b.

  The display unit 5 displays information on the target detected by the radar signal processing units 4a and 4b on the screen.

  As described above, the radar apparatus according to the present embodiment assigns a sector search beam with an extended distance to an arbitrary direction within the same search rate when a target is detected during search beam operation. The difference from the case of FIG. 5 is that the two-surface simultaneous transmission is performed, so the entire search is not interrupted even during the sector search operation, and the time required for the entire search does not change regardless of the sector search. Is a point.

  It has been explained that the radar signal processing units 4a and 4b control which antenna is selected by the transceivers 2a and 2b, but information is exchanged between the transceivers 2a and 2b. In this case, the transceivers 2a and 2b may select the antenna by themselves. Or the radar apparatus of a present Example may be provided with the control part for controlling which antenna 2a, 2b selects which aerial line.

  As a matter of course, the advantage of performing two-plane simultaneous transmission can be enjoyed not only when performing sector search, but also when performing a specific purpose beam such as ISAR in parallel with all-round search. That is, since the all-round search is not interrupted even during the ISAR operation, the radar apparatus of the present embodiment, for example, searches for the entire circumference (360 degrees) by the remaining five planes while applying the ISAR to a specific target. It can also be realized within the same search frame time as normal operation.

  As described above, according to the radar apparatus according to the second embodiment of the present invention, not only the same effect as in the first embodiment can be obtained, but also multi-functionality in operation can be realized. That is, the radar apparatus according to the present embodiment can independently perform a beam for a specific purpose other than a search beam such as a tracking beam or an ISAR during the search period, and therefore, a search rate that is one important element as a search radar. Specific applications such as tracking and ISAR can be performed at the same time.

1a, 1b, 1c, 1d, 1e, 1f Antenna 2, 2a, 2b Transceiver 3, 3a, 3b Beam forming unit 4, 4a, 4b Radar signal processing unit 5 Display unit

Claims (3)

A radar device capable of searching in all directions by a non-rotating phased array method,
A plurality of antenna surfaces by the phased array antenna form a polyhedron, and an aerial part including a predetermined direction in a covered area where at least two antenna surfaces of the plurality of antenna surfaces can be searched,
One or more transmission / reception units that select one of the plurality of antenna surfaces of the antenna unit and transmit a transmission signal and receive the reception signal through the selected antenna surface;
One or more beam forming units provided corresponding to each of the one or more transmission / reception units, and forming a reception beam based on a reception signal received by the transmission / reception unit;
A radar signal processing unit that performs target detection by performing signal processing based on the reception beam formed by the beam forming unit;
A radar apparatus comprising:   2. The radar apparatus according to claim 1, wherein the aerial part has six or more antenna surfaces, and an N square is formed by N antenna surfaces. A plurality of the transmission / reception units are provided,
The radar apparatus according to claim 1, wherein each of the plurality of transmission / reception units selects a different antenna surface from the plurality of antenna surfaces.

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