JPS5832667B2 - Synchronous wireless sound wave signal transmission method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a synchronous wireless device that transmits a wireless sound wave signal synchronized with a reference measurement cycle and timing in a measurement device that measures the distance between two points using sound wave propagation time. The present invention relates to a method of transmitting a sound wave signal.

Conventionally, in measurement systems that measure the distance between the sound wave transmitting side and the receiving side using the difference in arrival time of underwater sound waves,
When using a wireless sound wave transmitter, a sound wave of frequency f1 is emitted from a measurement sound reference point, which is a fixed object such as a ship's hull, and a wireless sound wave response signal transmitter (hereinafter referred to as a transponder) that moves underwater receives it. As a result, it responds by emitting a sound wave with a frequency of f2.

In this way, a sound wave with a frequency of fl is emitted from the acoustic reference point, and the transponder that receives it emits f2.
By measuring the time difference until the frequency of the wave returns to the acoustic reference point, the distance between the two points on the fixed side, which is the source of the sound wave, and the side, which is the stationary side, where the sound wave response signal is sent, can be measured. .

The disadvantage of this method is that the transponder generates a response wave by receiving sound waves from an acoustic reference point, so it requires sound wave transmission and reception functions, which not only complicates the configuration, but also If there is a noise component close to the received signal and its noise component level is close to or higher than the signal component level, the S/N ratio will be poor, and the sound wave with the correct f2 frequency will not be returned, making it difficult to process the received signal. The device may malfunction, reducing the reliability of the system's signal processing.

An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional techniques and to provide a method for generating a wireless sound wave signal that takes into account improved reliability of sound wave propagation processing of a measuring device, as well as reduction in size and weight.

In the present invention, the emission of sound waves from a wireless sound wave signal transmitter is
Unlike the conventional device described above, this is not due to the emission of a response sound wave that is output after receiving a signal sound wave from an acoustic reference point.
Synchronous timing circuits provided on both the fixed side measurement device main body and the mobile side synchronous wireless sonic wave generator are activated by wired connection or wireless communication, and the repetition period and time are set in advance against a reference signal. By synchronizing the sound wave emission timing and emitting sound waves from the synchronized wireless sound wave generator, sound wave propagation from the measuring device main body, which is an acoustic reference point, to the wireless sound wave signal transmitter side is unnecessary. This is a wireless sound wave signal transmission method that allows processing to be performed using only the reverse propagation, that is, so-called one-way propagation.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The attached figure is a block diagram showing an embodiment for explaining the synchronous wireless sound wave transmission system according to the present invention, and in the figure, 1
1 is a main body of a measuring device that utilizes a sound wave propagation time difference, and is installed on a fixed side such as on a ship, and includes a signal generation circuit 2, a signal processing control circuit 3, a preamplification circuit 4, and a synchronization timing circuit 5.

6 is a receiver serving as an acoustic reference point, 11 is a transmitter, and 12 is a synchronization timing signal line.

Further, 7 is a synchronous wireless sonic wave generator that is mainly attached to a moving object that is dropped into water, and includes a signal control circuit 8, a modulation circuit 9, a power amplification circuit 10, a signal generation circuit 2, and a synchronous timing circuit 5. There is.

13 is a sound wave propagation path, and a synchronous wireless sound wave generator 7
It is emitted from the transmitter 11 on the side.

The operation will be explained below.

First, by some means such as on a ship, the measuring device main body 1 and the synchronous wireless sonic wave generator 7 are connected by the synchronous timing coupling line 12, and the reference signal of each synchronous timing circuit 5 and the reference signal are connected. The synchronization and timing with the signal (in this case, the reference signal may be from either the measuring device main body 1 side or the synchronous wireless sonic wave transmitter 7) is adjusted by the synchronous timing circuit 5. Next, the synchronous timing coupling line 12 Remove it and proceed to the following operation.

That is, the carrier wave from the signal generation circuit 2 is modulated by the modulation circuit 9 with a carrier wave modulation signal output from the signal control circuit 8 after the synchronous wireless sonic wave generator 7 on the moving side is placed far away in water or the like. The modulated wave is amplified by a power amplification circuit 10 and sent to a sound wave propagation path 13 by a wave transmitter 11.

Since the signal sent out from the wave transmitter 11 matches the repetition cycle synchronization timing etc. in advance with the measuring device main body 1 using the above method, at the same time as the sound wave is sent out from the wave transmitter 11, the measuring device main body 1 In the signal processing control circuit 3, the reception is in the state, so the sound wave propagation path 13
The sound wave signal reaches the receiver 6 at the acoustic reference point with a delay of the speed of sound, and is converted into an electrical signal by the receiver 6.
The signal is amplified by the preamplifier circuit 4 of the measuring device main body 1 and guided to the signal processing control circuit 3.

Since the signal processing control circuit 3 is in the receiving state as described above, it receives the received signal converted into an electrical signal and performs appropriate signal processing accordingly.

As described above, according to the embodiment of the present invention, each time a sound wave is emitted from the synchronous wireless sound wave transmitter 7, it is received by the receiver 6 at the acoustic reference point and processed by the measuring device main body 1. This cycle is repeated.

As described above, according to the present invention, the propagation path is one-way propagation only from the synchronous wireless sonic wave generator, which facilitates signal propagation processing and greatly improves the stability and reliability of system reception processing. Ru.

In addition, the measuring device itself does not require a transmitting circuit, a wave transmitter, etc., whereas the wireless sound wave signal transmitter does not require a receiver, receiving amplifier circuit, receiving signal processing circuit, etc., simplifying the circuit and improving economic efficiency. In particular, wireless sound wave signal transmitters have the advantage of being smaller and lighter.

[Brief explanation of drawings]

The attached figure is an implementation block diagram for explaining the principle of the synchronous wireless sound wave signal transmission method according to the present invention. 1... Measuring device main body, 2... Signal generation circuit, 3... Signal processing control circuit, 4...
・Preamplifier circuit, 5... Synchronous timing circuit,
6...Receiver, 7...Synchronous wireless sound wave transmitter, 8...Signal control circuit, 9...
Modulation circuit, 10... Power amplifier circuit, 11...
... Transmitter, 12 ... Synchronous timing coupling line, 13 ... Sound wave propagation path.

Claims (1)

[Claims] 1. A method for transmitting a synchronous wireless sound wave signal in a measurement device, etc. that utilizes acoustic propagation time differences, which includes a signal generation circuit, a synchronization timing circuit, a signal processing control circuit, and an externally connected signal receiver, and to the receiver on the measuring device main body side through a measuring device main body that utilizes the acoustic propagation time difference attached to the main body, a signal generation circuit, a synchronization timing circuit, a signal suppression circuit, a modulation circuit, and a power amplification circuit. and a synchronous wireless sonic wave generator attached to the proboscis side to which a transmitter for transmitting signals is externally connected, and a synchronous timing circuit provided in each of the measuring device main body and the synchronous wireless sonic wave generator is coupled. , The repetition period and sound wave emission timing of the measuring device main body and the synchronous wireless sonic wave generator are synchronized in advance with respect to the reference signal, and after that, the coupling between the synchronization timing circuits is released, and the synchronous wireless sonic wave generator is released. The generator is moved, a general transmission wave is obtained from the signal generation circuit of the synchronous wireless sound wave generator, a sound wave is emitted from the transmitter, the emitted sound wave is received by the receiver of the measurement device, and the sound wave is In the measuring device body that receives the signal, a phase difference between a signal generating circuit having the same phase as the signal generating circuit of the wireless sonic wave generator is determined, and the distance between the sonic wave generator and the measuring device body is measured from the phase difference. A synchronous wireless sound wave signal transmission method characterized by: