JPS6271307A - Antenna stabilizer - Google Patents

Abstract

PURPOSE:To attain the attitude control of an antenna by dividing a rod antenna into two at the middle and connecting both the elements electrically by a feeding circuit, supporting it by a universal joint and engaging a drive torquer thereto thereby using a small-sized drive torquer. CONSTITUTION:The rod antenna 1 as an object to be stabilized is supported by a column 7 via a universal joint 6 provided with the drive torquer 3. The antenna is divided equally into two parts, they are installed vertically while the feeding circuit connected to the drive torquer at the center and connected electrically. In dividing the rod antenna into the same length and using the center as the turning shaft, the moment of inertial around the turning shaft is minimized and the size of the drive torquer for compensating the shaking is minimized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to attitude control of a rod-shaped marine antenna used in marine vessel communication, and in particular to reducing the vibration of the antenna due to the vibration of the ship. This relates to an antenna stabilizer device used for this purpose.

[Prior art and problems]

When communicating between a ship and a satellite, the ship's antenna must always be directed toward the satellite even if the ship is moving. As a means of stabilizing a marine antenna against such ship oscillations, conventional methods include configuring a feedback system using an oscillation sensor and a drive system to actively compensate for the oscillation;
Alternatively, a method has been proposed in which vibration is passively suppressed by adding the restoring force of gravity or the reaction torque of a gyro flywheel to the restoring force of gravity, and the former active antenna stabilizer is usually used.

FIG. 1 is a diagram showing an example in which an active stabilizer is applied to a conventional rod-shaped antenna, in which (a) is a side view and (b) is a plan view.

In the tjS1 diagram, 1 is the antenna, 2 is the feeder circuit, 3
4 represents a driving torquer, 4 represents an angle detector (for example, a 9-meter vertical axis), 6 represents a universal tilt, and 7 represents a column.

The configuration shown in FIG. 1 requires a large torquer to drive the antenna at the lowest position, which has the disadvantage that the antenna stabilizer device becomes large and heavy.

FIG. 2 is a side view showing another example in which an active stabilizer is applied to a rod-shaped antenna.

In the configuration shown in FIG. 2, since the antenna is driven at the top, only a small torquer is required, but the pillar itself becomes an obstacle (blocking) that blocks the antenna, deteriorating the performance of the antenna.

[Purpose of the invention]

The present invention solves the problems that occur when an active stabilizer is applied to a rod-shaped antenna for a ship, such as increasing the size of the device or deteriorating performance due to blocking. is intended to provide.

[Means for solving problems]

The above object is achieved according to the invention by the means described in the claims.

That is, the antenna stabilizer device according to the present invention has the following features:
The rod-shaped antenna is divided into two parts at the center, a feeding circuit is installed there, the pixel elements are electrically connected by the feeding circuit, and the abnormal position where the feeding circuit is installed is connected to a universal joint (hereinafter referred to as universal joint). By supporting it with a tuin (also known as a bow tie) and attaching a driving torquer to this,
This makes it possible to control the attitude of the antenna using a small driving torquer without degrading the antenna performance.

〔Example〕

FIG. 3 is a diagram showing an embodiment of the antenna section and the antenna driving section of the antenna stabilizer device according to the present invention, in which (a) shows a side view and (b) shows a plan view.

In FIG. 3, 1 is an antenna, 2 is a feeder circuit, 3 is a driving torquer, 4 is an angle detector (for example, a body alignment meter), 5 is a bluff door ohm, and 6 is an eninozusarreno.

India, 7 represents the pillar.

Figure PIIJ4 is a diagram showing an example of the electrical configuration of the antenna stabilizer device c according to the present invention, in which 8 is an antenna section, 9 is an antenna drive section, 10 is an antenna drive control section, 11 is a swing angle detection section, 12 represents a transmitting/receiving section, and 13 represents a variable shoulder section.

FIG. 5 is a diagram showing the operating state of this antenna stabilizer, and 14 indicates a ship.

In Figure 5, in a steady state with no ship movement, (a)
The antenna is oriented vertically. If the ship is listed to port, the antenna will move (b) if no control is taken.
The antenna tilts as shown in #i, but the antenna can be held vertically by detecting the ship's rocking angle with the rocking angle detector and forcibly moving the antenna in the opposite direction by that angle. (C) shows the behavior when the vessel is listed to starboard.

Although the above drawing describes the rolling (rolling) of a ship, the same applies to pitching (pitching). Note that the oscillation angle detection section always detects the tilt angle from the vertical direction.

Here, the rolling direction is the Y axis, and the pitching direction is the X axis.

As shown in FIG. 3, the rod-shaped antenna as the object to be stabilized is supported by the support 7 via a universal joint provided with a driving torquer. Each of the antennas is equally divided into two parts, which are installed one above the other with a feeder circuit connected to the driving torquer in the middle, and are electrically connected.

Generally, the moment of inertia (I) around the axis of rotation can be determined by the following formula.

I=Ig1mb”・・・・・・・・・・・・・・・
... (1) Here, Ig is the moment of inertia around the axis passing through the center of gravity and parallel to the axis of rotation, ugliness is the total IIR amount,
h is the distance between the center of gravity and the axis of rotation.

In equation (1), by matching h=o, that is, the center of gravity and the rotation axis, the moment of inertia around the rotation axis can be minimized.

Therefore, as in the configuration of the present invention, if the rod-shaped antenna is divided into equal lengths and the center of the feeding circuit is set as the rotation axis, the moment of inertia around the rotation axis will be minimized, and the driving torquer for vibration compensation will be minimized. Just something is enough.

Therefore, the oscillation angle detection unit (
For example, by using the angle information in the X-axis and Y-axis directions from the vertical noi-a device, it is possible to operate the X-axis and Y-axis torquers in the opposite direction to compensate for the oscillation. here,
An angle detector (for example, a potentiometer) is necessary to inform the seven-antenna drive control unit of current rotation angle information and to perform accurate oscillation compensation.

An embodiment in which one antenna is used has been described above, but an embodiment in which two antennas are used will now be described.

Fig. fpJ6 is a diagram showing an embodiment of the antenna part and the antenna driving part in the case of having two antennas, and 1 to 4 and 6.7 are the same as those explained in Figs. 1 to 3, and 5. represents the platform.

In this embodiment, a platform 5 is supported by a column 7 via a universal joint 6.
By connecting to the universal joint at its center of gravity, the driving torquer for attitude control can be made small as in the previous embodiment.

By adopting the electrical configuration shown in FIG. 7, the reception levels of the two antennas are constantly monitored by the reception level detection 81S14, and the antenna switching control section 13 selects the antenna with the higher reception level. By controlling the antenna switching unit 12 to select the antenna and using it as a communication system, blocking of the support can be completely eliminated and a ubiquitous effect can be achieved.

Here, when the C/N of the line is high, the reception level can be detected by RF, but when the C/N of the line is low, it is necessary to detect the reception level below the IF.

Note that the antenna stabilizer device of the present invention does not require a radome if it has a drip-proof structure.

〔Effect of the invention〕

As explained above, the antenna stabilizer device of the present invention relates to an active antenna stabilizer device using a rod-shaped antenna, and is capable of highly accurate sway compensation using a sway angle detector and a driving torquer. Structurally, the column does not become an obstacle and degrade performance, and the universal joint is placed near the center of gravity of the rod antenna, so the moment of inertia around each axis of rotation is minimized. Since it can be driven by a small torquer, there is an advantage that the device can be made smaller and simpler.

Furthermore, the antenna stabilizer device of the present invention has the advantage of providing the Guipersich effect by providing two antennas and switching to the one with a higher reception level.

[Brief explanation of drawings]

Figure 1 is a diagram showing an example of applying an active stabilizer to a conventional rod-shaped antenna, Figure 2 is a diagram showing another example of applying an active stabilizer to a conventional rod-shaped antenna, and Figure 3 is an antenna according to the present invention. 14 is a diagram showing an example of the electrical configuration of the antenna stabilizer device according to the present invention; FIG. 5 is a diagram showing the operating state of the antenna stabilizer; FIG. FIG. 6 is a diagram showing an embodiment of the antenna section and the antenna driving section when it has two antennas, and FIG. 7 shows an example of the electrical configuration of the antenna stabilizer device when it has two antennas according to the present invention. FIG. 1... Antenna, 2... Power supply circuit, 3... Drive torquer, 4...
・Angle detector, 5...-1 rat 7 ohm, 6
・・・・・・Universal joint, 7 ・・・
...Strut, 8 ...-Antenna part, 9...
...Antenna drive section, 10 ...Antenna drive control section, 11 ... Sway angle detection section, 12
...Transmission/reception section, 13...Modulation/demodulation section, 14...Antenna switching section, 15...
... Antenna switching control section, 16 ... Reception level detection section Agent Patent attorney Takashi Motokai (
a) Figure 1, Figure 2, Figure 3, Figure 4, Figure 5 (,5L) (b) Figure 6

Claims (2)

[Claims] (1) A device used for automatic attitude control of a rod-shaped antenna for a ship, in which a power feeding part is provided at the center in the length direction of the antenna, the power feeding part is supported via a universal joint, and the power feeding part is supported via a universal joint. Alternatively, an antenna stabilizer device characterized in that a driving torquer for controlling the attitude of the antenna is attached to the power feeding section. (2) Two rod-shaped antennas with a feeding part in the center,
A power feeding section is attached to both ends of a rod-like member supported through a universal joint near the center so as to be held through a driving torquer, and the driving force generation direction of the driving torquer is set in the universal joint. An antenna stabilizer device according to claim 1, wherein a driving torquer is engaged so as to be perpendicular to the antenna stabilizer device.