WO2018178003A1

WO2018178003A1 - Wideband wired antenna for an underwater craft

Info

Publication number: WO2018178003A1
Application number: PCT/EP2018/057626
Authority: WO
Inventors: Franck DURUISSEAU; Pascal Rivet
Original assignee: Naval Group
Priority date: 2017-03-27
Filing date: 2018-03-26
Publication date: 2018-10-04
Also published as: FR3064406B1; EP3602678A1; ES2897218T3; EP3602678B1; FR3064406A1

Abstract

This wideband-reception wired antenna for an underwater craft such as specifically a submarine, equipped with a winch for its deployment, is characterized in that the antenna includes, at its free end, a terminating nipple (41) in which there are arranged means (50) for storing electrical energy for supplying this end of the antenna, and whose operation is controlled by means forming a pressure sensor (51).

Description

Broadband wired antenna for underwater vehicle

The present invention relates to a broadband reception wire antenna for an underwater vehicle such as a submarine itself, equipped with a deployment winch thereof.

We know that underwater devices such as submarines themselves, are today equipped with broadband reception antennas to receive radio frequency signals.

Some of these wired antennas are based on radio frequency technology.

These antennas then comprise a coaxial cable for connecting the antenna to the rest of the submarine through a rotating collector with radiofrequency technology, the winch.

It is also known that wired antennas with optical fiber technology exist in the state of the art.

In this case, for example, an optical connector is used to connect the antenna to the rest of the submarine.

These antennas have common points and in particular a similar power supply mode.

Indeed, these antennas generally comprise a pair of copper electrical conductors that extend from one end to the other of the antenna.

However, current studies show that a coaxial cable has a density equivalent to a cable provided with an optical fiber and a pair of copper conductors.

To obtain a lower density in order, for example, to improve the immersion / velocity diagram of the antenna, it is necessary to be able to overcome this pair of copper conductors and thus to define another way of supplying the components of the terminal part. of the wired antenna.

The object of the invention is to provide such an antenna power supply.

To this end, the subject of the invention is a broadband reception wire antenna for an underwater vehicle such as a submarine itself, equipped with a deployment winch thereof, characterized in that An antenna comprises at its free end, a termination nipple in which are arranged means for storing electrical energy supply of this end of the antenna, and whose operation is controlled by means of pressure sensor. According to other features of the antenna according to the invention, taken alone or in combination:

the means for storing electrical energy are associated with a voltage / frequency converter indicating the state of these storage means;

the frequency signal delivered by the converter is integrated in the radiofrequency signal in order to be transmitted along the fiber towards the rest of the underwater vehicle;

the energy storage means comprise batteries;

- the deployment winch is equipped with a rotary collector with radiofrequency technology, connecting the antenna to the rest of the underwater vehicle, and the antenna is a fiber optic antenna whose end associated with the winch comprises interfacing means to the rotary connector with radiofrequency technology of this winch, comprising means for converting the signal from the optical fiber into a radiofrequency signal, the output of which is connected through coaxial cable means to the collector rotating at radiofrequency technology of the winch;

the fiber optic antenna comprises:

means for recovering a radio frequency signal,

broadband amplification means of the latter,

means for converting the radiofrequency signal into a signal

luminous,

means for transporting this light signal by optical fiber, and the interfacing means comprise:

means for converting the light signal into a radiofrequency signal,

broadband amplification means of this radio frequency signal, the coaxial cable means, and

- a radio frequency connector.

The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which:

- Figure 1 shows a schematic view of a wire antenna radiofrequency technology of the prior art;

FIG. 2 represents a schematic view of a wired antenna with optical fiber technology of the state of the art;

FIG. 3 represents a schematic view of a wired antenna with fiber optic technology compatible with a radiofrequency technology connection of an underwater vehicle; and - Figure 4 shows an embodiment of a wire antenna according to the invention.

In fact, FIG. 1 shows a wired antenna with radiofrequency technology.

This antenna is designated by the general reference 1 in this figure, and comprises at one end, a termination nipple, designated by the general reference 2, and at its other end, a conventional connector with radiofrequency technology, designated by the general reference 3 .

This connector makes it possible to connect the antenna to the rest of the equipment of the submarine, by a complementary connector of a deployment winch of this antenna, embarked aboard the submarine.

Such an antenna is in a conventional manner, several tens or even hundreds of meters long.

Such an antenna then comprises amplification means of the radiofrequency signal, received between a hot spot and a cold point of this antenna.

These amplification means are designated by the general reference 4 in this figure 1 and are powered by an activation / power system designated by the general reference 5.

Thus the core of this wire antenna 1 not only allows the reception of VLF / LF / HF signals, but also the supply of the line amplifier through the activation / power system.

A braid serves as a mass.

It is therefore this antenna configuration that is compatible with the majority of turntables with radiofrequency technology in submarines with a deployment winch of a wired antenna radio frequency technology.

FIG. 2 illustrates an exemplary embodiment of a wire antenna with fiber optic technology.

In this FIG. 2, the antenna is designated by the general reference 10 and therefore always has a terminating nipple designated by the general reference 11, in which a hot point and a cold point are defined for the radio frequency signal in active mode and in passive mode respectively.

This termination nipple January 1 also comprises a broadband amplifier designated by the general reference 12, associated with a laser for converting radio frequency signals into light signals.

This laser is designated by the general reference 13. This laser 13 is therefore associated at the output, with an optical fiber designated by the general reference 14, which extends along this antenna to the other end of this antenna to carry the signal.

This other end of the antenna is provided with a specific collector with fiber optic technology, designated by the general reference 15, for connecting this antenna to the rest of the underwater vehicle.

It is then conceivable that this fiber optic technology is not compatible with the radiofrequency connector as deployed in some submarines and illustrated in FIG.

An exemplary embodiment of another wire antenna is illustrated in FIG.

In this FIG. 3, the antenna is designated by the general reference 20 and always includes a termination nipple designated by the general reference 21.

This wired antenna always has a cold spot and a hot spot for the signals, and comprises a broadband amplifier designated by the general reference 22 and a laser designated by the general reference 23 for converting radio frequency signals into light signals.

An optical fiber designated by the general reference 24 makes it possible to transport these light signals from one end to the other of the wire antenna.

At the other end of the wired antenna, that is to say the one associated with the submarine, and more particularly to the deployment winch of the antenna of this submarine, there are provided interfacing means designated by the general reference 25, for converting the received light signal into a radiofrequency signal.

Thus, these means comprise means for detecting this light signal, designated by the general reference 26, from the optical fiber.

These detection means are associated with an amplifier designated by the general reference 27.

The supply of these members is provided by supply means 28. The output of these interfacing means 25 is then connected through coaxial cable means, designated by the general reference 29, to a conventional radio frequency technology connector. designated by the general reference 30 and thus allowing to connect this wire antenna fiber optic technology to a winch equipped with a radio frequency connector.

It is thus possible to equip the submarines whose deploying winch of the wired antenna is provided with a radio frequency connection with a wired antenna with fiber optic technology without involving heavy remelting work of the machine under - marine and in particular the replacement of the connectors. In the examples which have just been described, the antenna also comprises electrical supply conductors extending along the latter and being for example in the form of a pair of copper conductors.

These electrical conductors then allow to supply all of the components of this antenna and in particular those arranged at its termination nipple, from the winch connector of the submarine.

As noted earlier studies have shown that a coaxial cable has a density equivalent to a cable with an optical fiber and a pair of copper conductors. To obtain a lower density in order, for example, to improve the immersion / speed diagram, it is necessary to dispense with this pair of copper conductors.

An exemplary embodiment of such an antenna according to the invention and corresponding means is illustrated in FIG. 4.

In this FIG. 4, the wire antenna is designated by the general reference 40 and the termination nipple thereof by the reference 41.

This end portion of the antenna always comprises broadband amplification means designated by the general reference 42 and a laser designated by the general reference 43.

The output of this laser 43 is associated with an optical fiber 44, whose end associated with the underwater vehicle always comprises signal detection means 45, amplification means 46, and power supply means 47 of this part of the antenna.

Coaxial cable means 48 still make it possible to connect this end of the antenna through a standard radiofrequency connector 49, to the corresponding connector of the deployment winch of the submarine antenna.

Whereas in the preceding examples, the supply of the members or components arranged at the free end of the antenna is provided by a pair of copper conductors, in the embodiment illustrated in FIG. antenna according to the invention, this power is provided from energy storage means such as for example batteries designated by the general reference 50, placed in for example the end of the antenna termination nipple.

These electrical power storage means 50 supplying this end of the antenna then make it possible to supply the electrical power supply thereof, for example under the control of pressure sensor means, designated by the reference 51 in this figure 4. Thus for example when the antenna is at the surface, the nipple is not under pressure and the pressure sensor 51 is at the maximum volume to close the contact with the batteries.

The antenna is thus powered.

When the antenna is under the surface, the pacifier is under pressure and the pressure sensor is at minimum volume.

This then turns off the battery and the antenna is no longer powered.

When the antenna is stored in the submarine, the pacifier is no longer under pressure.

A battery deactivation system is then put in place.

Batteries or other means of storing electrical energy can easily be replaced by disassembling the pacifier or part of it on board.

In this FIG. 4, the energy storage means, such as, for example, the batteries, are also associated with means for monitoring and indicating their state and in particular their state of charge SOC.

In the example illustrated in this FIG. 4, these monitoring means comprise a voltage / frequency converter, indicating the state of these storage means.

This converter is designated by the general reference 52, and thus provides a status indication signal, whose frequency is a function, for example, of the voltage of the batteries.

A mixer designated by the general reference 53 makes it possible to integrate this frequency signal delivered by this converter with the radiofrequency signal, in order to be transmitted along the optical fiber 44 to the rest of the underwater vehicle.

The operators can then recover this signal to have a status information of the energy storage means.

Of course, other embodiments of these different means can be envisaged.

It is therefore conceivable that such an antenna structure has a number of advantages.

Indeed, it is thus possible to integrate on board a submarine, a wired optical fiber antenna of new technology, without requiring heavy intervention on the submarine, and in particular on the deployment winch of the wired antenna thereof, while using a radio frequency connection. In addition, improvements in the operational characteristics of the antenna are also obtained.

There is indeed a gain related to the removal of copper conductors and the maintenance in operational condition of the antenna requires only a replacement of batteries when the need arises.

Claims

1 .- Wired broadband reception antenna for an underwater vehicle such as a submarine itself, equipped with a deployment winch thereof, characterized in that the antenna comprises at its free end, a terminating nipple (41) in which are disposed means (50) for storing electrical energy supply of this end of the antenna, and whose operation is controlled by means of pressure sensor (51).

2. Antenna according to claim 1, characterized in that the means (50) for storing electrical energy are associated with a voltage / frequency converter (52) for indicating the state of these storage means.

3. - Antenna according to claim 2, characterized in that the frequency signal delivered by the converter (52) is integrated (in 53) with the radiofrequency signal to be transmitted along the fiber to the rest of the machine submarine.

4. Antenna according to any one of the preceding claims, characterized in that the means (50) for storing energy comprise batteries.

5. - Antenna according to any one of the preceding claims, characterized in that the deployment winch is equipped with a rotating collector with radiofrequency technology, connecting the antenna to the rest of the underwater vehicle, and the antenna is an optical fiber technology antenna whose end associated with the winch comprises interfacing means to the rotary connector radiofrequency technology of this winch, comprising means (45) forming the signal converter from the fiber optical (44) to a radiofrequency signal, the output of which is connected through coaxial cable means (48) to the radiofrequency rotary commutator of the winch.

Antenna according to claim 5, characterized in that the fiber optic antenna comprises:

means for recovering a radio frequency signal,

means (42) for broadband amplification thereof,

means (43) for converting the radiofrequency signal into a light signal, means (44) for transporting this light signal by optical fiber, and in that the interfacing means comprise means (45) for converting the light signal into a radiofrequency signal,

means (46) for broadband amplification of this radio frequency signal,

the means (48) forming a coaxial cable, and

- a radio frequency connector (49).