JPS5845757B2 - Synchronized beacon device for beacon groups - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention utilizes the isochronism of omega radio waves and the periodicity of omega radio waves, and uses the
At this point, the radio waves are received, and the frequency of the flashing signal generation circuit is corrected using the radio signals emitted from the corresponding station at 10 second intervals as determined by the Omega format, and the flashing and flickering of each sign is made to occur simultaneously. This invention relates to a synchronized marking device for a group of markings, in which the markings are operated as a group by causing the markings to be activated or to be activated at a predetermined time lag via a delay circuit.

In general, for example, among the losses caused by maritime accidents, a large portion is thought to be caused by inadequate navigational aids, and not only the loss of ships and cargo, but also the human casualties are extremely large.

Therefore, in the shipping and fisheries industries, there is a need for clear signs at sea, such as signs for the position of navigating vessels, for ensuring safe waterways, for fish farming facilities such as aquaculture rafts, net fish farms, and for various port construction works.

Conventionally, various types of visual markers have been used depending on the quality of the light, but they are easily misidentified when observed from the sea due to other visual markers, nearby lights, and the lights of vehicles on the ground.
Accidents are often caused.

Therefore, if a large number of maritime beacons flash or flicker at the same time, it will become clear to distinguish between them and other lights, and it will be easier to confirm the maritime beacons, but in order to maintain synchronization, It is extremely difficult to connect each maritime beacon with a cable.

Taking these points into consideration, the present invention utilizes omega radio waves to cause each maritime beacon to flash or blink all at once or sequentially with a predetermined time lag, without interconnecting each maritime beacon. Embodiments of the present invention will now be described with reference to the drawings.

Of the navigational aid radios used for positioning ships, etc. through hyperbolic navigation that applies the uniformity of radio waves, Omega uses extremely long waves and has extremely fast delivery speeds, with only a few transmitting stations on earth. Just installing 8 stations will cover the whole world.

Each A-H transmitting station transmits data in the Omega format of Fig.
, 13.6 KHz, 11 a KHz, and transmits high-power AI radio waves with an extremely accurate period of 10.0 seconds.

In order to control the flashing or blinking of the sign by drawing out the precise time element of this extremely rapid omega radio wave, each sign is equipped with an antenna 1 as shown in Figure 2.
has a device connected to the top 7 via a receiver 2, a field strength selection circuit 3, a duration shunt 4, a flashing signal generation circuit 5 and a lighting circuit 6.

The electric field strength selection circuit 3 is connected to the receiver 2 as shown in FIG.
a comparison voltage generation circuit 8 which outputs a comparison voltage according to the strength of an input signal from the receiver, an amplitude comparison circuit 9 which takes this output as one input and an input signal from the receiver 2 as the other input, and the amplitude comparison circuit 9; It consists of a monomulti 10 triggered by the output of the circuit 9.

As shown in Figure 4, the duration separation circuit 4 extracts a pulse as a synchronizing signal when the signal with a certain time width is interrupted.
The L12 consists of a Nant gate 13, a differentiation circuit 14, and an AND gate 15.

The blinking signal generating circuit 5 is a tuning fork, crystal, or GR with one trigger terminal connected as shown in FIG.

It consists of an oscillator circuit such as an LC.

The lighting circuit 6, as shown in FIG. 5, consists of a power-input switching element that blinks the top 7 in response to a blinking signal from the blinking signal generating circuit 5.

A case will be described in which the device configured as described above is installed at an arbitrary point on the earth, for example, an intermediate point ζ between the Japan station and the Hawaii station.

The omega radio waves captured by the antenna are transmitted to an arbitrary wave, for example, the first one, by the receiver 2 tuned to 11'KHz.
This is obtained as a series of combined periodic signals as shown in Figure i.

In the same figure, the maximum amplitude of Eiro and Hohe are the nearest distances (H station (Japan) and C station (Hawaii))
The signals from the remaining six stations located further away from the two stations between Harney and Torch are different in amplitude and duration from the signals from the two stations. ing.

The combined signal including these series of signals is, of course, a repeating signal with one period of 10 seconds, and even at a point on the earth, this period does not change and the maximum amplitude also increases during one period. There can be no two or more signals with the same duration.

Such combined periodic signals from the receiver 2 are then sent to a field strength selection circuit 3 that selects only the signal with the maximum amplitude.
is input.

As mentioned above, this circuit is composed of a comparison voltage generation circuit 8, an amplitude comparison circuit 9, and a monomulti 10.
First, the signal is converted by the comparison voltage generating circuit 8 into a comparison voltage that changes in proportion to the maximum amplitude voltage in the input signal, which rises relatively quickly and falls extremely slowly, as shown in FIG. 1J.

The amplitude comparison circuit 9 compares this comparison voltage with the signal from the receiver and outputs it, so that no matter where this device is used, only the signal with the relative maximum strength among the received signals is output. can be detected.

The output of the amplitude comparison circuit 9 is an alternating current rectangular wave signal that repeats by and low at the same frequency as the receiving frequency, as shown in FIG.

This signal is converted into a DC rectangular wave with a constant duration error t3 as shown in FIG. 1 by the next-stage monomulti 10 with a retrigger function.

In other words, during this metastable period (the monomulti with retrigger function used here), when the next trigger pulse is input, it will not return to a stable state until a further metastable period has elapsed from the point of input. Has a personality.

By setting the metastable period of such a monomulti with a retrigger function to be longer than the period of the input signal, an AC signal can be converted into a DC signal with accurate rise and fall.

This is a circuit G using a general diode and capacitor.
In contrast, it is not affected by the strength or frequency of the input signal.

The omega signal of the closest station selected by the field strength selection circuit 3 is then judged by the duration separation circuit 4 to determine its duration, and a synchronization pulse is generated when the radio waves in the target layer are interrupted.

That is, this operation uses the two monomultis shown in FIG. 4 to generate a rectangular wave t4 slightly shorter than the duration of the target layer and a rectangular wave t5 slightly longer than the duration of the target layer, as shown in m and p in FIG.
As shown in Figs.
Take out the differential waveform as shown in Figure 0 and apply it to AND gate 1
This is realized by erasing the specified duration t when a longer signal is input.

For example, as shown in FIG. 1, the output of the field strength selection circuit 3 is the H station signal that lasts t1 for 1 second, and the C signal that lasts 1.1 seconds t2.
Assume that the signal of the station is included.

At this time, to detect only the H station, one monomulti 11
If a time t4 slightly shorter than 1 second is generated as shown in m in the same figure, and the other monomulti 12 is generated for a slightly longer time t5 (as shown in p in the figure), at the point when the signal of the H station is interrupted, A synchronizing signal as shown in q of the same figure is obtained, and at the time when station C is interrupted, the output from the other station does not appear either.

The synchronizing signal q produced in this manner is a very accurate signal with a period of 10 seconds, and is applied to the trigger terminal of the flashing signal generating circuit 5.

Here, the blinking signal generating circuit 5 has an oscillator that oscillates the same frequency stably and accurately using a tuning fork, crystal, etc. for each sign, as described above.

Based on this oscillation frequency, a flashing signal with a required period such as t6 in FIG. It is blinking.

Such a flashing signal generating circuit is synchronized with the periodic pulse from the duration separation circuit for each cycle of the received signal as shown in Figure 1R, and a large number of signs are synchronized to the other side and flash all at once. It will flicker.

Further, as shown in FIG. 6, a delay circuit 16 is provided between the blinking signal generation circuit 5 and the lighting circuit 6 in FIG. This is delayed to create a time lag, and is input to the lighting circuit 6 to light the top 7.

By sequentially changing the delay times of a large number of installed maritime markers, the flashing lights and flickers can be operated sequentially with a time lag, making it possible to clearly identify the markers as a group.

As described above, according to the present invention, it is possible to synchronize the individual signs by receiving omega radio waves without having to connect them with cables, and to synchronize the signs arranged at a predetermined interval and shape. Alternatively, they can be made to flash or blink at a predetermined time lag to facilitate visual recognition as a group.

The main advantages of the synchronization device according to the present invention include the following.

(1) Due to the fast delivery speed of Omega radio waves, it can be used over a very wide range (for example, it is possible to control beacon lights installed all over Japan with the same device).

(2) Since eight stations around the world transmit on the same frequency, it can be used anywhere in the world by simply changing the time setting of the duration separation circuit.

(3) Since Omega radio waves are not affected by terrain or seasons, a stable synchronized beacon system can be implemented.

(4) Since the entire body of the buoy, etc. can be used as an antenna, it is unrelated to oscillations, etc., and does not require a strong and special antenna like conventional ones.

(5) Since it propagates quite well underwater, it can also be applied to underwater signs.

(6) Since a signal with one period of 10 seconds is obtained, a blinking signal having a simple integer number of seconds such as 2 seconds, 4 seconds, 10 seconds, etc. can be obtained based on this signal.

Further, in this embodiment, 10 seconds is taken as one period, but the frequency may be taken out every several periods and divided, and the application is wide.

(7) A relatively low-grade oscillator can be used to control the blinking signal generation circuit, making it possible to manufacture a low-cost device.

Although this embodiment has been described for the case where it is applied to a group of markers at sea, due to the penetrability of Omega radio waves, it can also be applied to synchronized control devices for groups of markers installed in the air, on water, and on the ground, as well as underwater and underground. Of course.

Additional related current invention patent No. 1000311 (Japanese Patent Publication No. 52-3296
No. 0) is a case where aviation radio beacon radio waves are used as external radio waves for synchronous control.

This invention uses omega radio waves as external radio waves.

In the current invention, the synchronization signal is detected only by detecting the time width, but in this invention, the synchronization signal is detected by detecting the electric field strength and the time width.

With the device of the current invention, the detection frequency and time width change depending on the area where it is installed, so the device had to be changed, but with this invention, the same device can be used over a wide area of several thousand kilometers, improving productivity.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the relationship between the Omega format showing the radio wave emission schedule of the Omega station and the waveforms of each part of the synchronization device of the present invention and the passage of time. FIG. 2 is an electrical block diagram showing an embodiment of the present invention. , Figure 3 is a block diagram of the electric field strength separation circuit in Figure 2, Figure 4 is a block diagram of the duration separation circuit in Figure 2, and Figure 5 is the connection between the blinking signal generation circuit and lighting circuit in Figure 2. 6 are electrical block diagrams of other embodiments. 1 is an antenna, 2 is a receiver, 3 is an electric field forcing selection circuit, 4 is a duration separation circuit, 5 is a blinking signal generation circuit, 6 is a lighting circuit, 7 is a top, and 16 is a delay circuit.

Claims (1)

[Claims] 1 A large number of signs are arranged at predetermined intervals and shapes, and each sign is equipped with an omega radio wave receiving device, and the output of the receiving device is inputted to an electric field strength selection circuit and a duration separation circuit (the received signal is A pulse signal is generated for each period, the pulse signal is supplied to a blinking signal generation circuit, the blinking signal generation circuit determines the period of flashing and flickering of the sign, and the output of the blinking signal generation circuit is supplied to the lighting circuit. , a synchronized marking device for a group of markings, characterized in that each marking flashes or flickers as a group.