JP2011141121A - Rescue signal oscillator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a method for searching for an in-water fallen person which is simple, needs no adjustment and low in cost, and a rescue signal oscillator thereof. <P>SOLUTION: A transponder for detecting the azimuth of the in-water fallen person which enables homing by a normal navigation apparatus or radio equipment is constituted by using a detection circuit 2 of a microwave, an arithmetic unit 3, an oscillator 4 and a response antenna 5, and a device for transmitting a response signal on a low frequency not in a radar band to a radio communication device and the rescue signal oscillator which specifies the azimuth of the in-water fallen person on a radar PPI scope by a pointing operation are constituted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

Technology field

  The present invention relates to marine accidents, in particular, rescue of a water drop person, and is intended to specify the direction of a water drop person using a radar and radio communication equipment already installed in a ship.

  Sailors and their passengers on sailing vessels are always at risk of falling. Ship rescue signal generators use satellites and beacons such as beacons are legally maintained, but for individual human beings, life jackets and drowning whistles, lights, colored markers, etc. However, it is still an old-fashioned method, and there is a high possibility of losing sight of a waterfall at night or in stormy weather.

  It is economically difficult and not implemented in the private sector to be technically possible to attach to every person on board a GPS receiver and a wireless device that transmits its position.

  There are inflatable radar reflectors, but sufficient antenna height and reflection area are necessary for effective signal reflection, and the height and area of the portable size are insufficient. In stormy weather, it is not so popular because it disappears in the sea surface reflection.

  There is a transponder that responds at the reception frequency of the radar in response to the radio wave emitted by the radar in the conventional technology, but it is expensive, consumes a lot of power and is physically required to oscillate the radar frequency band. It was difficult to put on.

  If you lose sight of a waterfall during stormy weather or at night, searching is extremely difficult, and drifting can occur for several days in strong currents. Currently, there is no economical and portable rescue signal oscillator or search method that can be used by all passengers.

Problems to be solved by the invention

  The cost of the reflector method is low, but the radar wave is attenuated by the arrival and further attenuated by the time the reflected wave is received, resulting in a weak radio wave, so it is difficult to confirm with a small reflector. Moreover, in order to make reflection effective in all directions, it is necessary to divide the reflector into several stages for each direction, which also makes it difficult to secure the reflection area. It is an object of the present invention to specify the heading direction of a waterfall person with a radio frequency for navigation communication that can be economically configured, instead of performing this response with microwaves used for radar in a response type transponder that emits its own signal instead of reflection. And

Means for solving the problem

  In order to solve the above-mentioned problems, the present invention is a communication that is commonly used as a trigger by directly detecting a spatial wave of a radar device that rotates once in several seconds and emits a microwave in each direction with a general diode. Sends a low frequency signal to the system's talk channel. The searcher confirms the position of the water dropper from the direction of the running line on the PPI scope to which the audio signal is synchronized.

The invention's effect

  According to the present invention, an expensive response microwave oscillation circuit is not required, and it is possible to respond to a standard radio equipment mounted on a ship with a single low-frequency signal.

  If the heading accuracy for confirming the water drop is less than 90 °, it converges at the position of the water drop, so it is practical even without a special display device. In other words, in a radar that rotates once every 2 seconds, it is in the range of 0.5 seconds, which is a range in which a human can react reflexly with an acoustic signal generated periodically.

  If these series of methods are implemented, the searcher listens to the response sound that flows from the international VHF radio device without any additional equipment, and traces around the radar PPI scope with his / her finger according to the rotation of the running line. If the finger is stopped at the same time, the direction can be obtained.

One embodiment of the present invention is shown in FIG.
The wide-area antenna 1 is formed by direct detection of an omnidirectional wide-band antenna centered on 9 GHz. A detection diode is provided at the center of the wide-area antenna 1 and constitutes a detection circuit 2 together with a capacitor. The detection output is input to an arithmetic circuit 3 constituted by a CPU incorporating an A / D converter, and generates a tone corresponding to the signal peak voltage as short as about 200 ms immediately after the received radar pulse. Is transmitted by the oscillator 4 and the response antenna 5. The searcher listens to the received signal with his / her ear and traces the finger on the PPI scope according to the movement of the running line.

  In this system, the search side radar output is 2 KW or more even in the radar for small ships, and can easily be received within a range of about 1 mile. The altitude of the wide area antenna 1 and the response antenna 5 may be about 50 cm. The response transmission output is about 10 mW to 50 mW. Efficiency 30% If the rotation period of the radar is 2 seconds, the average power consumption of the rescue signal oscillator is approximately 20 mW or less. These period, antenna height, response output, and power consumption are parameters necessary for adjusting the effective range of the system and are not the fundamental differences of the present invention.

  The principle form of the present invention is a means for wide-area reception in the radar frequency band, a means for responding and transmitting received pulses in different frequency bands, and a means for specifying the direction of the water drop person on the PPI scope by the low frequency signal.

Effects of the embodiment

  According to this embodiment, radar is detected in a general mass-production type diode and a capacitor, and the frequency range of reception is wide, and radars in most frequency bands equipped on ships can be used. The response signal is also a rescue signal, although there is a problem with the Radio Law, so it can be used as the main channel of each band, and if this is announced, other ships in the navigation can confirm the presence of the water dropper. In other words, no search equipment is required for the vessel to be searched.

  There is no need for expensive parts in the construction of the rescue signal oscillator, and a typical lithium coin battery CR2032 of about 3 grams can be transmitted for 24 hours, and the device can be composed of several tens of grams including the case.

  The most important thing is the economy that can be distributed to all passengers, and the current device of several hundred thousand yen cannot be used as a personal beacon. The apparatus according to the present invention has a cost performance that can be sufficiently penetrated even if a commercial margin is included.

Other embodiments

  In the embodiment of FIG. 1, a single detection circuit is used. However, it is basically the same whether a plurality of detection circuits are provided, a filter and an amplifier are provided after reception, or an arithmetic circuit is used without using a CPU. The number of detection circuits, the number of filters, the addition of amplifiers, and the configuration of arithmetic circuits are not direct means of the present invention.

It is a block diagram which shows one Embodiment of this invention.

1. Wide area antenna 2. Detection circuit Arithmetic circuit 4. 4. Oscillator circuit Response antenna

Claims (1)

  A radar pulse wave that rotates an antenna using a microwave is received by the wide-area antenna 1 and the detection circuit 2, and the signal is processed by the arithmetic circuit 3 to control the oscillator 4, thereby responding to a radio frequency different from that of the radar. 5 is a rescue signal oscillator that detects the direction of a water drop by pointing and collating on a radar PPI scope using a device that generates a guidance signal and a low frequency signal.

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