JP6859167B2 - Ship - Google Patents

Description

The present invention relates to ships.

As a technology for deceiving radar detection, a jamming technology is often used to prevent detection (do not give necessary information) by adding interference (ECM) to radar waves transmitted by the detection side. In addition, some jamming techniques use a deception repeater (deception repeater) and a radar reflector (see, for example, Patent Document 1).

The reception repeater receives the radiation of the radar wave, reads the signal of the radar wave, transmits a deceptive wave whose intensity is changed at the same frequency as a reflected wave, and receives this to detect the distance and size of the detection target. It is possible to misidentify the direction, speed, etc.

The radar reflector receives the radiation of the radar wave and reflects it by changing the frequency and intensity, and causes the detection side to receive the reflected deceptive wave.

Here, the detection side analyzes the reflected wave (echo) and plots the radio wave intensity with respect to the directional distance. At this time, since a peak occurs at the edge portion to be detected, for example, in the case of a ship, a sharp peak appears at the mast portion or the like. Such characteristic points are recorded as a profile to be detected, and an image image (acquired image) of the detected ship or the like can be displayed by image processing this data.

On the other hand, when using ISAR (Reverse Synthetic Aperture Radar), which transmits and receives radio waves many times while moving and synthesizes the received radio waves by reflecting the Doppler effect, it is possible to detect the movement of the detection target (target). it can. As a result, not only the size but also more detailed high-resolution shape data of the detection target (target) such as a vehicle or a ship can be acquired, and the type of the detection target can be specified (estimated) and identified. ..

JP-A-2002-090446

At present, there is no technology aimed at deceiving acquired images for inverse synthetic aperture radar.

In addition, when the radio wave reflection is deceived by additional equipment such as a radar reflector, the installation position of characteristic equipment such as a radar reflector can be easily specified. Therefore, the shape of the detection target can be specified by analyzing the acquired data in consideration of the position of equipment such as a radar reflector. Therefore, it is required that the equipment itself for deception cannot be specified or is difficult to identify.

The present invention has been made in view of the above problems, and provides a ship capable of deceiving an ISAR image of a ship acquired by reflecting the Doppler shift amount into a shape different from the silhouette of an actual ship. With the goal.

A ship according to an aspect of the present invention includes a hull and a rocking body that is swingably provided with respect to the hull and serves as a reflector of a reverse synthetic aperture radar, and the rocking body is attached to the hull. It is a support of the fall prevention rope.

Since the rocking body is attached to the hull, the inverse synthetic aperture radar transmitted by the detection side is reflected by the rocking body. At this time, by the oscillator is rocking, according to rocking amount, it is possible to vary the amount of Doppler shift of the reflected wave reflected by the oscillator.

In the above ship, it may be configured such that the oscillator is swung in response to the rocking of the hull.

Ship according to another aspect of the present invention includes a hull, capable of pivoting with respect to ship body, swinging control the oscillator as a reflector of the inverse synthetic aperture radar, the swing amount of the oscillator momentum It is equipped with a control mechanism.

In the above ship, the rocking body is an elastic member arranged in connection with the hull, is supported by the elastic member may comprise a rocking body that rocking relative to the hull.

Ship according to another aspect of the present invention includes a hull, capable of pivoting with respect to ship body, and a rocking body as a reflector of the inverse synthetic aperture radar, the oscillator is the oscillator in cross section of the perpendicular to the roll direction of the hull including the installation position, it is configured to swing with greater angular than the angular velocity of the maximum height position of the hull.

According to the ship of the present invention, it is possible to deceive the ISAR image of the ship acquired by reflecting the Doppler shift amount into a shape different from the silhouette of the actual ship.

It is a side view which shows the ship which concerns on one Embodiment of this invention. It is a figure which shows the swaying body of the ship which concerns on one Embodiment of this invention. It is a front view which shows the ship which concerns on one Embodiment of this invention. It is the figure which compared the acquired image at the time of deception.

Hereinafter, a ship according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. Here, the present embodiment relates to a ship that can be deceived so as not to specify the shape of the inverse synthetic aperture radar transmitted (transmitted) from the detection side.

As shown in FIGS. 1 to 3, the ship A of the present embodiment is installed on the hull 1 and the hull 1, and swings in response to the swing of the hull due to waves during sea (water) navigation or berthing. The rocking body 2 is provided.
Further, the oscillating body 2 of the present embodiment is supported by connecting to an elastic body 3 provided by connecting to the hull 1 and connecting to the elastic body 3, and the elastic body is elastically deformed and oscillated according to the oscillating of the hull 1. It is configured to include a swinging main body 4. It is preferable that the swinging body 2 is configured and installed so as to swing at least in the roll direction T of the hull 1.

Further, the swaying body 2 of the present embodiment is fixed to the hull 1 and includes a swaying amount control mechanism 5 for adjusting / controlling the swaying amount of the elastic body 3 and the swaying body 4. The swaying amount control mechanism 5 is configured to adjust / control the swaying amount of the swaying body 4 by, for example, grasping / releasing the swaying body 4 or fixing / releasing it with an electromagnet. Further, the amount of sway may be adjusted / controlled by contacting / contacting the sway body 4. In this case, the swaying body 4 is fixed to the hull 1 and immovable by arranging the swaying body 4 apart from the hull body 4 and adjusting the separation amount as appropriate so as to collide / contact with the hull 1 when the hull 1 is swaying. It may be configured so that the swaying amount of the swaying body 4 can be arbitrarily set with respect to the swaying amount of the hull 1.

Further, the rocking body 2 has a cross-sectional view orthogonal to the roll direction (traveling direction of the ship A) of the hull 1 at the position where the rocking body 2 is provided, and is larger than the angular velocity of the maximum height of the hull 1 (such as the top of the mast). It is configured to swing at an angular velocity.

For example, in the present embodiment, a plurality of columns of fall prevention ropes arranged side by side along the outer circumference at predetermined intervals are configured as the swinging body 2 on the outer peripheral side of the deck.

Then, in the ship of the present embodiment having the above configuration, the swaying amount control mechanism 5 is controlled to bring the swaying body 2 into a swayable state when the own ship is put into a deceptive state.

Then, the plurality of swaying bodies 2 are swayed by the hull 1 and are driven by the swaying of the hull 1, and are swayed by the amount of swaying according to the installation position thereof. In the present invention, the swinging body 2 does not necessarily have to be driven by the swinging motion of the hull 1.

Here, the detection side transmits an inverse synthetic aperture radar and analyzes the reflected wave / echo to acquire an ISAR image of the ship A to be detected and identify the ship A. Further, the ISAR image is drawn by frequency-analyzing the reflected radio wave from the target, and the horizontal axis is the distance and the vertical axis is the Doppler shift amount (or Doppler frequency and radio wave intensity).

At this time, since the navigating vessel A is swaying due to the influence of waves and the like, the swing width of a high place such as a mast is large, and the Doppler shift amount of the reflected wave from the mast is large. On the contrary, the swing width of a low part such as the main hull is small, and the Doppler shift amount of the reflected wave from the main hull is small. By reflecting this Doppler effect, a high-resolution ISAR image close to the actual silhouette can be obtained.

On the other hand, in the present embodiment, as shown in FIG. 1, for example, when the swinging bodies in a part of the range (reference numeral S1) are made capable of swinging, they are provided in the low position range S1 of these main hulls. The swaying body 2 sways with a large swing width. Therefore, the Doppler shift amount of the reflected wave from the swinging body 2 becomes large.

As a result, the ISAR image obtained by analysis by the detection side is originally drawn as a ship equipped with one mast as shown in FIG. 4 (b) with respect to the silhouette of the actual ship shown in FIG. 4 (a). However, as shown in FIG. 4C, it is drawn as if it were a ship equipped with two masts. As a result, it is possible to deceive as if the ship is different from the original ship A.

Further, for example, if the swinging body 2 in a part of the range indicated by the reference numeral S2 in FIG. 1 is made capable of swinging, as shown in FIG. 4D, it is as if it were a commercial ship having a large side area such as a container ship. You can also deceive.

That is, in the ship A of the present embodiment, regardless of the characteristic equipment such as the radar reflector, it is used (as if it were) as a plurality of columns of the fall prevention rope so that the installation position of the swinging body 2 is not specified. At the same time, it becomes possible to deceive the acquired image of the inverse synthetic aperture radar.

In addition, a plurality of deceptive states can be easily realized at will.

Here, as shown in FIG. 3, the distance L ₁ of the distance from the rolling center O1 of the hull 1 to the top of the mast L, from the rolling center O1 to the base end of the pivotal member 2 (swing body _4), oscillating body Assuming that the length of 4 is L ₂ , the rolling cycle of the hull 1 is T, and the rolling cycle of the swinging body 2 (rolling body 4) is T ₁ , the vibration velocity (angular velocity) V _{1 at the} top of the mast is V ₁ = 2πL / T. It becomes. The vibration velocity of the top of the swing member 2 is deception body (angular velocity) _{V 2} becomes _{V 2 = 2πL 1 / T +} 2πL 2 / T 1.

Then, in order not to characteristics detected side that it is deception, it is sufficient to match the vibration speed V ₂ of the top portion of the vibration speed V ₁ and oscillating body 2 of the mast top _(V 1 ₌ V _2).

That is, if 2πL / T = 2πL ₁ / T + 2πL ₂ / T ₁ to T ₂ = T ₁ × L ₂ / (L ₁ −L ₂ ), and the deceptive body 2 is constructed so as to satisfy this. It will be good. If a hull 2 that satisfies this condition is installed on the hull 1, it is possible to deceive at any time.

Although one embodiment of the ship according to the present invention has been described above, the present invention is not limited to the above one embodiment and can be appropriately modified without departing from the spirit of the present invention.

1 Hull 2 Hull 3 Elastic 4 Main body 5 Hull control mechanism A Vessel T Roll direction O1 Rolling center

Claims (5)

With the hull
A rocking body that is swingably provided with respect to the hull and serves as a reflector of the inverse synthetic aperture radar.
Equipped with a,
The rocking body is a ship that is a support for a fall prevention rope attached to the hull. With the hull
A rocking body that is swingably provided with respect to the hull and serves as a reflector of the inverse synthetic aperture radar.
A swing amount control mechanism that controls the swing amount of the rocking body, and
Vessels equipped with. With the hull
A rocking body that is swingably provided with respect to the hull and serves as a reflector of the inverse synthetic aperture radar.
With
A ship configured such that the rocking body swings at an angular velocity larger than the angular velocity at the maximum height position of the hull in a cross-sectional view orthogonal to the roll direction of the hull including the installation position of the rocking body. Ship according to any one of claims 1 to 3, wherein the oscillator is configured to swing in accordance with the rocking of the hull. The rocking body
An elastic body connected to the hull and
Supported by the elastic body, and the swing body to swing with respect to the hull,
The ship according to any one of claims 1 to 4.

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