JP2625666B2 - Active sonar experiment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active sonar experimental apparatus for transmitting an acoustic pulse into water, receiving an echo from a target, and obtaining information on the presence of the target, position information, and the like. The active sonar experiment device which was made into.

[0002]

2. Description of the Related Art An active sonar is a device which transmits a search sound toward a target, receives a reflection sound which is reflected upon the target sound, and obtains information on the target. Is an experiment for that purpose. FIG. 3 shows a conventional active sonar experiment apparatus. As shown in the drawing, the experimental apparatus 30 includes a transmitting unit 32 that transmits a probe sound, a receiver 34 that receives the probe sound transmitted from the transmitting unit 32 and reflected by a target (not shown),
A data recorder 12 for recording the search sound received by the receiver 34, a data processing unit 36 for processing and analyzing data, a timing signal generator 38 for generating a timing signal (Ping signal) for the search sound, etc. It is composed of

In an active sonar experiment, when a timing signal is generated from a timing signal generator 38, a transmitting unit 32 transmits a search sound in accordance with the timing signal, and at the same time, the timing signal is recorded in the data recorder 12, and FIG. As shown, a timing signal is added to the search sound received by the receiver 34.

[0004]

However, in the conventional active sonar experimental apparatus, only the timing signal is recorded between the search sounds, and the individual search sounds cannot be identified. Therefore, in order to search for the probe sound to be analyzed at the time of data analysis after the test, it is necessary for the analyst to use a method such as playing back the data recorder from the beginning and counting the time from the start and the number of probe sounds. There was very poor work efficiency.

Some digital data recorders write information to the head bits of the digital data recorder to search for the data. However, this method is not used in the analog system, and it is necessary to convert the data into digital data and use a digital data recorder.

[0006]

SUMMARY OF THE INVENTION In the present invention, an active sonar experiment apparatus is provided with a transmitter for transmitting a probe sound into water and a reflector in water to enable the experiment to proceed easily and reliably. A receiver for receiving the reflected search sound, a data recorder for recording the search sound received by the receiver, and transmitting the search sound to the transmitter to start transmission of the search sound and the data A synchronization signal generating circuit that uses a search number encoded into a synchronization signal to be output and recorded to a recorder, and a reception number that reads a search number reproduced by the data recorder and identifies a search sound based on the search number. An active sonar experiment apparatus was configured with a data search processing circuit. In the received data search processing circuit,
The received data of the search number to be identified is identified, and the identified desired
Active sonar experiment to output only communication data
The device was configured. Further, in the reception data search processing circuit,
And output the received data of the desired search number
Thereafter, the output from the received data search processing circuit is terminated.
The active sonar experiment apparatus was configured to perform the test.

[0007]

The search sound transmitted from the transmitter and reflected and received is assigned a search number from the synchronization signal generation circuit and recorded in the data recorder. Therefore, even if the search sound is continuously transmitted and recorded in the data recorder, the search sound can be identified based on the search number assigned to each search sound, and the desired search sound can be easily determined. Can be used for analysis.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an active sonar experiment apparatus. The active sonar experimental device 2 includes a transmitter 4 for generating an electric signal, a transmitter 6 for converting the electric signal from the transmitter 4 into sound waves and transmitting the sound underwater, and a synchronization signal generating for transmitting a synchronization signal. A circuit 8; a receiver 10 for receiving sound waves reflected back in water and converting the received sound waves into electric signals; a data recorder 12 for recording electric signals from the receiver 10; It comprises a number output circuit 14, a received data search circuit 16, a data processing section 18, and the like.

The synchronizing signal generating circuit 8 is connected to the transmitter 4 and the data recorder 12, and transmits a synchronizing signal in which a search number is encoded to the transmitter 4 and the data recorder 12. The search number has a continuous numerical value, and start and end signals are added before and after the search number. The transmitter 4 is shown in FIG.
As shown in FIG. 5, a signal wave of a predetermined frequency divided by a certain length is generated, and the signal wave is transmitted to the transmitter 6 by receiving a synchronization signal from the synchronization signal generation circuit 8. The transmitter 6 is a device that converts an electric signal into a sound wave, converts the electric signal from the transmitter 4 into a sound wave, and transmits the sound wave underwater.

A target (not shown) to be tested is provided at a position separated from the transmitter 6 by a predetermined distance. The receiver 10 is disposed at substantially the same position as the transmitter 6, converts underwater sound waves into electric signals, and converts the underwater sound waves into electric signals.
Send to 2. The data recorder 12 includes the receiver 10
Is connected to the synchronizing signal generating circuit 8 as described above.
A search sound received by the receiver 10 is recorded, and a synchronization signal from the synchronization signal generation circuit 8, that is, an encoded search number is recorded, and the reception sound including the search sound and the search number is recorded. Data can be reproduced arbitrarily.

The search number output circuit 14 is disposed between the data recorder 12 and the reception data search circuit 16 and reads a search number from the reception data reproduced by the data recorder 12, and sequentially displays the numerical value. . Further, the reception data search circuit 16 is connected to both the data recorder 12 and the search number output circuit 14 and can input a search number to be searched. When the reception data is reproduced by the data recorder 12, it is input. When the search number is reproduced, the reception data with the search number is sent to the data processing unit 18. The data processing unit 18 analyzes and processes the received data.

Next, the operation of the experimental apparatus 2 will be described.

A search sound is transmitted from the transmitter 6 underwater in accordance with the synchronization signal from the synchronization signal generation circuit 8, propagates through the water, and hits and reflects on a target. The reflected search sound is received by the receiver 10 and sequentially sent to the data recorder 12, where it is recorded, and the search number from the synchronization signal generation circuit 8 is also recorded. That is, the received search sound is recorded with the search number attached thereto. Then, the recorded received data is reproduced from the data recorder 12 as necessary, sent to the data processing unit 18, and analyzed there.

At this time, in addition to playing back the received data recorded in the data recorder 12 continuously from the beginning, if there is a place to be searched again among the received data thus continuously played back, The search number is input to the reception data search circuit 16. The search number is output by the search number output circuit 14 while performing fast forward or rewind by the data recorder 12, visually checked, and the recording medium of the data recorder 12 such as a tape is placed near the desired search number. Move. Then, when the recording medium is moved to the vicinity of the desired search number, the data recorder 12 is reproduced again and the received data is retrieved.
Send to

The reception data search circuit 16 does not perform output until the preset search number matches the reproduced search number, and at the time when the search number matches, the received data having the search number is sent to the data processing unit 18. Output and analyze.

As described above, according to the experimental apparatus 2 according to the present invention, the received data recorded in the data recorder 12 can be individually distinguished and searched by the search number.
Necessary received data can be easily called and analyzed from the continuously recorded received data, and the analysis operation can be easily performed.

In the received data search circuit 16,
The received data after the searched received data may be sequentially output to the data processing unit 18 until the search is completed, or only the received data equal to the searched search number may be output to the data processing unit 18.
May be output to perform processing and end.

Further, until the search number to be searched is input, the data processing unit 18 continues to output the received data and performs processing. When the search number to be searched is input, the output of the received data is stopped. May be used for the termination processing of the above.

[0020]

According to the active sonar experiment apparatus of the present invention, the synchronization signal of the synchronization signal generating circuit is set to an encoded search number, and the search number is recorded in the data recorder together with the received search sound. Therefore, when analyzing data after the active sonar test, it has the following effects,
This has the effect of improving the data analysis work efficiency comprehensively.

Since a search number is output as a search number in a search number output circuit, it is possible to confirm in which part of the data recorder the received data to be analyzed is recorded. Play from the beginning,
The operation of measuring the number of detections can be omitted, and the time for data analysis is greatly reduced.

Further, an erroneous analysis due to an erroneous counting of the number of search by the analyst is prevented, and the effect of improving data analysis accuracy is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of an active sonar experiment apparatus according to the present invention.

FIG. 2 is a graph showing a transmission signal according to the present invention.

FIG. 3 is a block diagram of a conventional active sonar experiment device.

FIG. 4 is a graph showing a conventional transmission signal.

[Explanation of symbols]

2 Experimental apparatus 4 Transmitter 6 Transmitter 8 Synchronous signal generation circuit 10 Receiver 12 Data recorder 14 Search number output circuit 16 Received data search circuit 18 Data processing unit

Claims (4)

(57) [Claims] 1. A transmitter for transmitting a probe sound underwater, a receiver for receiving the probe sound reflected by an underwater reflector, and recording the probe sound received by the receiver. a data recorder for a synchronous signal generating circuit using a Sagushin number encoded on the synchronization signal that is output and recorded in the Detarekogu together to start sending Sagushin sound output to the transmitter, the data recorder An active sonar experiment apparatus comprising: a reception data search processing circuit that reads a search number reproduced by the above-described method and identifies a search sound based on the search number. 2. The reception data search processing circuit according to claim 2,
2. The active sonar experimental apparatus according to claim 1, wherein the reception data of a desired search number is identified, and only the identified desired reception data is output. 3. The reception data search processing circuit,
2. The active sonar experiment apparatus according to claim 1, wherein the output from the reception data search processing circuit is terminated when the reception data of a desired search number is identified and output. 4. The active sonar experimental apparatus according to claim 1, wherein a start signal is provided immediately before the synchronization signal, and an end signal is provided immediately after the synchronization signal.