JP4102382B2 - Weather radar equipment - Google Patents

Description

  The present invention relates to a radar device for weather observation, and more particularly to a weather radar device effective for observation of local weather.

  A conventional weather radar apparatus includes a reflecting mirror that has a relatively small degree of curvature of the mirror surface and a primary radiator disposed on the mirror axis and outward from the end surface of the mirror surface. The structure was supported so that it could rotate. (For example, refer nonpatent literature 1).

Published by JRC Japan Radio Co., Ltd., micro meteorological radar Met-Navigator catalog (publication date unknown)

The conventional meteorological radar system is configured as described above, and since the parabolic antenna is used as a radar antenna with a common sense design, the transmitter / receiver is installed at a location different from the antenna. There was a problem that it did not have sufficient portability required for radar.
In addition, since the transmitter / receiver is separated from the antenna, transmission loss is large, and there is a problem that it does not have sufficient sensitivity to observe weak weather phenomena such as 1 mm / h rainfall.

  The present invention has been made to solve the above-described problems, and provides a weather radar apparatus capable of ensuring portability necessary for a weather radar apparatus and realizing high-sensitivity observation performance for weather phenomena. With the goal.

The weather radar apparatus according to the present invention has a circular parabolic surface, an aperture diameter capable of securing an antenna gain as a weather radar, and the focal point of the mirror surface within a plane formed by the mirror end surface on the mirror axis. A wide angle side lobe that interferes with weather radar used in mountainous areas is reduced by arranging the radiation surface of the primary radiator in the above-mentioned plane and setting the opening angle to 90 degrees. A parabola reflector, a turntable that supports the parabola reflector so as to be pivotable in the vertical direction via a reflector support mechanism, and the turntable and the parabola reflector provided at the lower part of the turntable horizontally. A rotating mechanism portion that can be rotated in a direction, and a transceiver that is provided behind the parabolic reflector and below the rotating mechanism portion, and integrally supports the rotating mechanism portion, the rotating table, and the parabolic reflector. equipped with a door, above The turntable, the rotation mechanism unit, and the transmitter / receiver have the same rotation center in the vertical direction, and the reflector support mechanism is configured so that the surface formed by the mirror end surface of the parabolic reflector is held in a substantially vertical direction. The center part of the parabolic surface of the parabolic reflector is positioned closer to the parabolic reflector support part side of the rotary table than the parabolic reflector side end face of the transceiver, and the lower end of the parabolic reflector is the upper end face of the transceiver The parabola reflector is supported by the turntable so as to be positioned further downward and can rotate around the side peripheral surface of the transceiver. The rotating mechanism section faces the lower surface of the rotating table, and the feeding waveguide passing through the center of the parabolic surface of the parabolic reflector includes the reflecting mirror support mechanism and the rotating table. And above By rolling through a mechanism connecting the primary radiator and the transceiver above, it is obtained by shortening the distance between the primary radiator and the transceiver.

In the weather radar device according to the present invention, the drive unit of the rotation mechanism unit and the transceiver are stored in the same storage unit.

  The meteorological radar apparatus according to the present invention is configured as described above, and since the degree of curvature of the rotating paraboloid of the reflecting mirror is increased, the reflecting mirror end face at the lower back of the reflecting mirror is greatly separated from the rotation center. Therefore, even if a transmitter / receiver is installed in this portion using the space generated in the lower back of the reflector, the radius of rotation of the entire antenna does not increase. Accordingly, the radar device as a whole can be made smaller, and portability is improved.

  Further, since the focal length of the reflecting mirror becomes the shortest point corresponding to the degree of curvature of the mirror surface, the primary radiator becomes close to the reflecting mirror surface. Therefore, when the fidome is attached to the front surface of the reflecting mirror, the fidome can be manufactured to be shallow and thin, so that the manufacture is easy, the cost is reduced, and the portability is improved. Further, since the length of the feed waveguide can be shortened, transmission loss can be reduced.

  Further, since the primary radiator is used as the 180-degree aperture antenna, there is little radio wave radiation in the direction of the reflecting mirror end face, and therefore there is little spillover of the radiated radio wave from the reflecting mirror end face. Therefore, since the entire antenna has few wide-angle side lobes, when used in a mountainous area, reflection echoes from surrounding mountains are reduced, and suitability for local weather observation is improved.

Furthermore, since the transmitter / receiver is disposed at the lower back of the antenna, the transmission line length between the antenna and the transmitter / receiver can be shortened, transmission loss is reduced, transmission power is increased, and reception sensitivity is improved. .
Therefore, the system gain as a radar apparatus is improved, and it becomes possible to observe a weak meteorological phenomenon necessary for a local observation radar, for example, 1 mm / h rainfall.

  In addition, since the rotation drive mechanism of the antenna is housed in the same housing as the transceiver, a completely integrated structure can be obtained, and portability is improved.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the overall configuration of the weather radar apparatus according to the first embodiment. In FIG. 1, a reflecting mirror outer frame 1 gives mechanical strength to the outer peripheral portion of the reflecting mirror 2, and a reflecting mirror support frame 7 is a frame that mechanically supports the reflecting mirror 2 from the back.

  The fidome 3 is a thin film made of synthetic resin or rubber that transmits radio waves for preventing snowfall or the like from adhering to the reflecting mirror surface. In the first embodiment, as described later, the primary radiator 4 and its feeding waveguide 5 do not protrude so much forward that the attachment is easy.

  The support wire 8 supports the primary radiator 4 and prevents the primary radiator 4 from vibrating due to antenna rotation or wind. Reference numeral 6 denotes a connection feed waveguide that passes through the center of the reflecting mirror 2 and reaches the feed waveguide 5 of the primary radiator 4. The reflecting mirror support mechanism 9 is a mechanism that supports the entire reflecting mirror 2. Reference numeral 10 denotes a rotation axis for rotating the reflecting mirror 2 in the vertical direction and setting the direction in the elevation direction, and it is desirable that it can be normally set in a range from 5 ° upward to 2 ° downward.

  Reference numeral 11 denotes a turntable, and the upper part from this part rotates regularly in the horizontal direction. It is desirable that the rotation speed is normally set to about 2 rpm to 2.4 rpm. The rotation mechanism unit 12 houses an electric motor for steady rotation of the antenna in the horizontal direction and a rotary encoder for detecting a rotation angle.

  The transmitter / receiver unit 13 stores components of the transmitter / receiver and a drive unit of the rotation mechanism unit 12. Accordingly, the antenna, the transceiver, and the rotation mechanism are all integrated. 14 is a frame for the integrated radar device, and 15 is a bracket for fixing the weather radar device of the first embodiment to the ground only during the period of use, and is fixed to an anchor bolt or the like on the ground with a screw. The After use, the screw can be removed when moving to another location. Reference numeral 16 denotes a handle for adjusting the level of the antenna, and reference numeral 17 denotes an adjustment handle for the antenna tilt.

  FIG. 2 is a rear view of the weather radar apparatus according to the first embodiment. By providing the reflecting mirror 2 with the through-hole 18 of the connection feeding waveguide 6 and providing the flexible feeding waveguide 19 on the back surface of the reflecting mirror 2, the reflecting mirror 2, the primary radiator 4, the feeding waveguide 5 and A parabolic antenna is formed by the feeding waveguide 6 for connection.

The reflector 2 of the parabolic antenna is a rotating paraboloid having a focal point on the central axis of the mirror surface. The radio wave radiated from the opening surface of the primary radiator 4 placed at the focal point toward the reflecting mirror 2 is reflected by the reflecting mirror 2 and converted into a plane wave distributed over the entire opening surface of the antenna.
Accordingly, the wave traveling from the aperture surface is concentrated in the forward direction, forming a so-called antenna beam. The aperture diameter of the reflecting mirror 2 has the following relationship with the antenna gain G.

The antenna gain G is determined from the system gain required by the radar equation of the weather radar. When the antenna gain G is determined, the aperture area of the reflecting mirror 2 is determined and the radius thereof is determined.
However, if the antenna is required to be small and light like the antenna of the first embodiment, it is determined so that the system gain can be satisfied with the smallest possible antenna diameter by trade-off with other system factors. The

How to make the mirror surface with respect to the determined reflecting mirror diameter is determined in consideration of another factor. This is the antenna aperture efficiency η _a included in equation (1). The aperture efficiency η _a is a coefficient having _a maximum value of 1, and is determined mainly by the directivity of the primary radiator 4 that radiates radio waves to the reflecting mirror 2.
Although there are other factors that affect the aperture efficiency, the directivity of the primary radiator 4 that is the main component will be described here.

  First, the mirror surface determination will be described. FIG. 3 shows the mirror surface shape as compared with its focal length. In the first embodiment, the antenna gain G is set to G = 36 dB from the system gain. Since this antenna gain value includes transmission line loss caused by the feed waveguides 5 and 6 and the waveguide filter, it is not a pure antenna unit gain.

  The radius of the reflector required to secure this antenna gain is d = 60 cm. As shown in FIG. 3, there are a large number of reflecting mirror surfaces satisfying the condition of radius d = 60 cm from (3) to (10). That is, when the mirror surface of the reflecting mirror is cut at a position indicated by a one-dot chain line with a radius d = 60 cm, and the corresponding focal length of the cut reflecting mirror is indicated, it is indicated by a thick dotted line.

  In the first embodiment, therefore, the focal length of 30 cm, that is, the mirror surface (3) is adopted. This is the mirror surface that is bent the most to form a reflector having a radius of 60 cm. Normally, the mirror surface (4), (5), (6), etc. are selected in relation to the antenna aperture efficiency described later, but in the case of the first embodiment, the degree of curvature of the mirror surface is increased and the back surface of the reflector is increased. I try to create as much space as possible.

  FIG. 4 shows the relationship between the focal length of the reflecting mirror 2 and the degree of curvature of the mirror surface, and how far the end surface of the reflecting mirror 2 is away from the perpendicular dropped from the center of the reflecting mirror 2 in accordance with the change in the focal length. Is shown. This figure is derived from the following equation. Assuming that the vertex of the paraboloid is 0 in the Cartesian coordinates and the z axis is the rotation axis, when the parabolic focal length is f, the x axis and the y axis are the spreading surfaces of the paraboloid, the vertical axis is the x axis, The horizontal axis is the y axis.

x ² + y ² = 4 fz (2)
If y = 0 here,
z = x ² / 4f (3)
4 is obtained.

  According to this figure, when f = 30 cm, it can be seen that the end face of the reflecting mirror is 30 cm away from the origin (0), that is, the x-axis. It can be seen that there is a difference of 15cm compared to the case of 60cm. This difference is critical in the case of mainly small weather radar devices such as the present invention.

  It is necessary to rotate the antenna horizontally or slightly downward for local meteorological observation, especially for local rainfall observation. When the mirror surface is shallow, it is difficult to secure a space on the back. That is, in FIG. 1, it is necessary to prevent the back surface of the reflecting mirror 2 from contacting the rotation mechanism unit 12 and the transceiver unit 13. For this purpose, the position of the reflecting mirror must be increased, or the reflecting mirror support mechanism 9 must be lengthened in the horizontal direction. If it does so, the height of an antenna will increase or a rotation radius will become large, the size and weight of the part will increase, and portability will fall.

  In the conventional small-sized weather radar apparatus, the transmitter / receiver is installed at a separate location, and only the rotating mechanism 12 is disposed on the back surface of the reflecting mirror. Therefore, it is not necessary to place importance on the mirror bending of the reflecting mirror. This is because the rotation mechanism 12 alone is small. In the meteorological radar apparatus according to the present invention, the transmitter / receiver is arranged at the lower back of the reflector 2, and the transmission line loss caused by the feeding waveguides 5, 6 and the like is minimized to ensure the system gain necessary for observing the meteorological phenomenon. Moreover, it is compatible with portability.

  Next, the effect of increasing the mirror curvature on the antenna characteristics will be described. As a result of placing the specular curvature at the maximum possible point, the focal length is shortened to the limit, and the radiation surface of the primary radiator 4 is flush with the surface formed by the end surface of the reflecting mirror 2. Accordingly, the primary radiator 4 is used as a so-called “180 degree aperture” type. The expression expressing the directivity of the primary radiator 4 that is generally used is as follows.

√G (Ψ) = (1 + t) e ^-αt (4)
Where α is a constant representing the sharpness, and Ψ is the angle at which the reflector is viewed from the primary radiator.

FIG. 5 is a diagram showing the directivity of the primary radiator 4 with α as a parameter. In the first embodiment, since the ordinary waveguide opening type primary radiator 4 is used, the directivity characteristic corresponds to α = 3.
At this time, Ψ = 90 °, that is, the gain at the end face of the reflecting mirror 2 falls to −20 dB from the center value. That is, there are relatively few radio waves spilled over from the end face of the reflecting mirror 2 and radiated directly into the space.

Therefore, the characteristic that the wide-angle side lobe as a whole antenna, especially the side lobe in the 90 ° direction is small can be obtained. This characteristic is an important characteristic for a radar apparatus that is used in a mountainous area for local weather observation, such as the weather radar apparatus of the present invention. The reason for this is that it is used under topographical conditions where the surrounding area is surrounded by mountains, so that there are few reflection echoes from the mountains, and the influence of ground reflection on the observation accuracy in the observation direction in front of the antenna is small. Because.
The aperture efficiency η _{a with} respect to the aperture angle Ψ of the primary radiator 4 is expressed by the following equation using α as a parameter.

  FIG. 6 shows this graphically. As can be seen from this figure, when α = 3, the opening efficiency becomes maximum when the opening angle is around 60 ° to 70 °. However, it is used because the opening efficiency is lowered by setting the opening angle to 90 °.

The reduction in aperture efficiency means that the antenna gain that should be originally obtained cannot be obtained. In FIG. 5, the antenna gain value results in a loss of 1 dB or more.
However, in the case of weather radar, paying attention to the fact that the antenna gain occupies the system gain is smaller than that of a normal radar device, the present invention improves the above other characteristics than the antenna aperture efficiency. Is important.

  The spread of weather radar meteorological targets (rainfall and snowfall) is greater than the spread of radar beams. The power received from the target is weaker in proportion to the square of the distance while it is weaker in proportion to the square of the distance when the aircraft is the target. In other words, this means that in weather radar, the antenna gain is apparently effective only in one way. The radar equation of weather radar is expressed by the following equation.

It becomes. Looking at equation (8), it can be seen that G ₀ is multiplied only once and works only for one way. The present invention focuses on this characteristic of weather radar.

  FIG. 7 is a conceptual diagram showing the internal structure of the rotation mechanism unit 12 and the transceiver unit 13. Reference numeral 19 denotes a flexible waveguide, 20 denotes a waveguide filter, 21 denotes a rotation mechanism section penetrating waveguide, and 22 denotes a rotary joint. Reference numeral 23 is a rotary drive motor, and 24 is a drive gear attached to the motor shaft. An internal gear 25 is fixed to the rotation mechanism unit 12 and meshes with the drive gear 24. An encoder drive gear 26 is attached around the rotation mechanism section through waveguide 21. Engaging with this is the encoder rotating gear 27. Reference numeral 28 denotes an encoder. The bearing 29 rotatably supports the rotation mechanism unit 12 on the transceiver unit 13.

  FIG. 8 shows an electrical system diagram of a portion below the rotary joint 22 of FIG. Portions corresponding to the conceptual diagram of the internal structure in FIG. Hereinafter, FIG. 8 will be described. 30 is a bending waveguide, 31 is a transmission / reception switching circulator, 32 is a limiter, 33 is a low noise mixer, 34 is a magnetron output waveguide, 35 is a magnetron, 36 is a pulse transformer, 37 is a high voltage modulator, 38 Is a heater power supply, 39 is a high voltage modulator power supply, 40 is a pulse generator, 41 is a receiver, 42 is a DC-DC converter, 43 is a power supply unit, 44 is a terminal plate, 45 is a magnetron cooling fan 45 which is a transmission tube. is there.

  Hereinafter, the operation of the first embodiment will be described with reference to FIGS. The feeding waveguide that penetrates the center of the reflecting mirror 2 through the feeding waveguide penetration 18 becomes a flexible waveguide 19 immediately after that. The waveguide 19 is flexible in order to make the direction of the antenna elevation angle (antenna tilt) variable. A waveguide filter 20 is provided at the lower portion thereof, and a broadband component that becomes unnecessary radiation into the space is removed from the transmission output power from the magnetron 35.

  A rotary joint 22 is provided below the rotation mechanism section penetrating waveguide 21, and a waveguide connection is made between the rotating portion and the fixed portion. Inside the transmitter / receiver unit 13, there is a rotation drive motor 23 for driving the rotation mechanism unit 12, and the power is transmitted to the rotation mechanism unit 12 by meshing between the drive gear 24 and the internal gear 25, and FIG. The upper part rotates from the line indicated by the one-dot chain line of A. The encoder drive gear 26 is attached around the rotation mechanism penetrating waveguide 21 and transmits the rotation of the rotation mechanism unit 12 to the encoder rotation gear 27. Thereby, the encoder 28 outputs an angle signal.

  The bearing 29 supports the mass above the rotation mechanism unit 12 in a freely rotatable manner. In order to reduce the load of the bearing 29 as much as possible, it is desirable that the center of gravity above the rotation site is as close to the rotation center as possible. The closer to the center, the less the unbalanced load associated with the rotation of the bearing. For this purpose, it is desirable that the reflecting mirror 2 (dotted line in FIG. 7), which is an unbalanced load element, be as close to the center of rotation as possible. In the first embodiment, the degree of curvature of the reflecting mirror 2 is increased to approach the rotation center.

  The output of the rotary joint 22 is connected to the bending waveguide 30, and the output is immediately connected to the transmission / reception switching circulator 31. The reception side output enters a low noise mixer 33 via a transmission output limiter 32. Here, it is converted to an intermediate frequency and enters the receiver 41. The input / output side of the transmission / reception switching circulator 31 is connected to the magnetron 35 via the output waveguide 34. The feature of the first embodiment is that the transmission / reception switching circulator 31 is arranged in the immediate vicinity of the antenna.

  In a conventional radar apparatus using a parabolic antenna, the transmission / reception switching circulator 31 is placed away from the antenna and then connected to the transceiver. Therefore, since the feed waveguide leading to the antenna is long, the loss due to it is large. These transceivers have the configuration and internal structure shown in FIG. 8 and require an arrangement space as shown in FIG.

  If you try to place this on the back of the parabolic antenna, you have to move the parabolic antenna farther away from the center of rotation, but doing so increases the overturning moment due to the antenna load, and the mechanism and pedestal that supports the parabolic antenna increases. In addition, when a radome is used, its outer diameter increases. The only way to avoid it is to place the parabolic antenna above the transceiver. Then you will be taller.

  In the conventional apparatus, the mass and size of the entire apparatus are thus increased, and the portability as a small-sized meteorological radar apparatus is reduced. In the radar apparatus according to the first embodiment, the mirror curvature of the reflector of the parabolic antenna is increased so that a space can be formed so that the transmitter / receiver can be arranged on the rear surface of the reflector. It can be installed and withdrawn within 4 hours even by a single worker, and is highly portable.

  The signal entering the receiver 41 is processed using a logarithmic amplifier having a wide dynamic range necessary for weather phenomenon reception. However, as described above, the loss in the feed waveguide is suppressed to the minimum. Taking advantage of the wide dynamic range, it can receive particularly weak weather phenomena with high sensitivity, and can also receive strong weather phenomena.

The magnetron 35 is excited by a high voltage pulse by a pulse transformer 36 and oscillates a high frequency transmission pulse. The heater is supplied with power from a heater power supply 38. The pulse transformer 36 is excited by a high voltage modulator 37. The power is supplied from a high voltage modulator power supply 39.
The pulse generator 40 receives a trigger signal from the receiver 41 and generates a pulse to excite the high voltage modulator 37.

  The cooling fan 45 cools the magnetron 35. As shown in FIG. 7, the transmitter / receiver unit 13 is arranged compactly from the rotary joint 22 to the cooling fan 45. The dimensions of the transmitter / receiver unit 13 are set in a well-balanced manner as an integrated structure when the vertical, horizontal, and height are arranged on the back of the reflector.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the curvature of the reflecting mirror surface is the maximum curvature of the mirror surfaces corresponding to the opening diameter of the reflecting mirror, so that the radiation surface of the primary radiator 4 is formed by the reflecting mirror end surface. The primary radiator 4 operates as a 180-degree aperture antenna. In the second embodiment, the focal length of the reflecting mirror 2 is slightly larger than that in the first embodiment, and the primary radiation is performed. The radiation surface of the device 4 is retracted to the corresponding position and positioned outward from the end surface of the reflecting mirror so that it operates as an aperture antenna of less than 180 degrees. Even if it does in this way, there exists an effect substantially the same as Embodiment 1, However, The effect falls proportionally as the focal distance becomes large.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described. In the first embodiment described above, the outer shape of the upper edge portion of the rotation mechanism portion 12 is substantially a right-angled shape as viewed from the side as shown by the solid line in FIG. 9, but the third embodiment is shown by the one-dot chain line in FIG. As described above, the inclined surface is inclined upward, and the entire shape of the rotation mechanism unit 12 is a pyramid cylinder. With such a configuration, the clearance between the reflecting mirror 2 and the rotating mechanism portion 12 can be further increased, so that the rotating radius of the reflecting mirror 2 can be reduced by that amount. Therefore, it is necessary to increase the driving force of the rotary drive motor 23.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the whole structure of the weather radar apparatus by Embodiment 1 of this invention. It is a rear view of the weather radar apparatus shown in FIG. It is a figure which shows the relationship between the focal distance of a parabolic antenna, and a mirror surface shape. It is a figure which shows the relationship between the focal distance of a parabolic antenna, and a specular curvature. It is a figure which shows the directivity of the primary radiator which uses (alpha) as a parameter. It is a figure which shows the relationship between the aperture angle of a parabolic antenna, and aperture efficiency. FIG. 3 is a conceptual diagram illustrating an internal structure of a rotation mechanism unit and a transceiver unit according to the first embodiment. FIG. 8 is an electrical system diagram of a portion below the rotary joint of FIG. 7. It is a side view which shows the whole structure of the weather radar apparatus by Embodiment 3 of this invention.

Explanation of symbols

1 reflector outer frame, 2 reflector, 3 fidome, 4 primary radiator,
5 Primary radiator feed waveguide 6 Connection feed waveguide 7 Reflector support frame
9 reflector support mechanism, 10 elevation angle adjusting shaft, 11 turntable,
12 rotation mechanism part, 13 transceiver part, 14 mount, 15 fixing bracket,
16 Horizontal adjustment handle, 17 Antenna tilt adjustment handle,
18 Feeding waveguide reflector mirror penetration part, 19 Flexible waveguide,
20 waveguide filter, 21 rotation mechanism section through waveguide,
22 rotary joints, 23 rotary drive motors, 24 drive gears,
25 internal gear, 26 encoder driving gear, 27 encoder rotating gear,
28 encoder, 29 bearing, 30 bending waveguide,
31 circulator for transmission / reception switching, 32 limiter, 33 low noise mixer,
34 magnetron output waveguide, 35 magnetron, 36 pulse transformer, 37 high voltage modulator, 38 heater power supply, 39 high voltage modulator power supply,
40 pulse generator, 41 receiver, 42 DC-DC converter,
43 power supply, 44 terminal board, 45 cooling fan.

Claims (2)

It has a circular parabolic surface, has an aperture diameter that can secure an antenna gain as a weather radar, and has a curvature such that the focal point of the mirror surface is located in the plane formed by the mirror end surface on the mirror axis. A parabolic reflector in which the radiation surface of the primary radiator is disposed in the plane and the opening angle is set to 90 degrees, thereby reducing wide-angle side lobes that hinder weather radar used in mountainous areas; A rotating table that supports the reflecting mirror so as to be rotatable in the vertical direction via the reflecting mirror support mechanism, and the rotating table and the parabolic reflecting mirror provided at the lower part of the rotating table can be rotated in the horizontal direction. rotation and rotation mechanism portion, the rotary mechanism provided in the lower portion of the rotation mechanism on the back of the parabolic reflector, and a transceiver for integrally supporting the turntable and the parabolic reflector, and the turntable The mechanism and transceiver The reflector support mechanism has the same center of rotation in the straight direction, and the center of the paraboloid of the parabolic reflector is maintained in a state where the surface formed by the mirror end face of the parabolic reflector is held in a substantially vertical direction. Is positioned on the parabolic reflector support end side of the rotary table from the parabolic reflector side end surface of the transceiver, and the lower end of the parabolic reflector is positioned below the upper end surface of the transceiver, and A parabolic reflector is supported on the rotary base so that the parabola reflector can rotate around the side peripheral surface of the transceiver, and the transceiver has an upper surface opposed to a lower surface of the rotation mechanism unit, and the rotation mechanism unit has an upper surface thereof. Is opposed to the lower surface of the turntable, and a feeding waveguide that penetrates the center of the parabolic surface of the parabolic reflector passes through the reflector support mechanism, the turntable, and the rotation mechanism section. Primary release above Connecting the vessels and the transceiver, the weather radar apparatus is characterized in that by shortening the distance between the primary radiator and the transceiver.   The meteorological radar apparatus according to claim 1, wherein the drive unit of the rotation mechanism unit and the transceiver are stored in the same storage unit.

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