JPH01233384A - Sonar receiver - Google Patents

Abstract

PURPOSE:To achieve an efficient search of an underwater object, by adding a recording circuit for received signals and a reading control circuit therefor to a conventional sonar receiver. CONSTITUTION:A receiving circuit 4 is make up of N channels to cover a full bearings of 360 deg.. Received signals inputted into N input terminals #1-#N of those 12 of the receiving circuit are received and processed with an AGC circuit and a band limiting circuit of the receiving circuit 4 to be outputted to two systems, a video signal system and a listening signal system. The video signal system performs a processing such as detecting integration with a N channeled video signal processing circuit 5 and an output thereof is sent to a video signal recording circuit 6, which records a video signal to always display an image. With the listening signal system, an output of the receiving circuit 4 is applied to a listening signal selection circuit 9 and an output of the receiving circuit in a bearing as an operator desires is selected by a cursor bearing signal to be applied to a cursor bearing signal input terminal 13, undergoes a frequency conversion and, then, amplified with a listening signal processing circuit 10 to be outputted to a head phone 11 for listening.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sonar receiving device, and particularly to a sonar receiving device that emits sound waves underwater, receives echoes from underwater objects, and determines the position of the underwater object from the received signal. The present invention relates to a sonar receiving device for producing an audible signal for an operator to hear from a received signal, in a receiving device for a sonar device.

[Conventional technology]

Conventionally, in this type of sonar receiving device, a plurality of receiving circuits each receiving a specific azimuth width are prepared in order to receive signals in azimuths of 360 degrees around the entire circumference, and the outputs of these plurality of receiving circuits are used as a video signal system. and is supplied to the auditory signal system. In this case, the video signal system uses multiple received signals to provide a 360°
The position of underwater objects in all directions can be seen at a glance by PPI or B-1 display, and in the audio signal system, one channel of the receiving circuit is selected by the cursor operated by the operator and the signal is The system is configured so that the operator can hear it.

[Problem to be solved by the invention]

The conventional sonar receiving device described above is subjected to various processing so that the received sound waves can be easily seen and heard directly by the operator. Especially in the video signal system, the operator is unable to overlook multi-channel signals. In order to prevent this, cathode ray tubes are used that use phosphors with a particularly long afterglow time, and recently, formats such as storing video signals in a memory device and constantly displaying them have been adopted.

However, the most important thing in a sonar device that searches for underwater objects is how to separate and identify the reflected sound from the underwater object from among various underwater noises, and the way to achieve this is to visually check the video signal. At the same time, it is almost essential for the operator to also hear and identify audible signals.

As described above, conventional sonar systems utilize both the visual and auditory senses of the operator to search for underwater objects, but there remain major obstacles in terms of the basic operating principle. This is due to the propagation speed of sound waves in water, which is approximately 1500 m/sec, which is approximately 1/200,000 times slower than the air propagation velocity of electromagnetic waves, which is 3 x 108 m/sec. For this reason, once a sound wave signal is emitted from a sonar receiver, it is difficult to detect an underwater object at a distance of, for example, 60 km.
If the object is far away, the echo signal from the object will only return after about 80 seconds, and the operator will have to wait 80 seconds to hear the signal.In this way, the signal buried in noise can be detected by hearing. The operator has to wait a long time to
This problem is particularly problematic when searching for underwater objects that move at high speed.

[Means to solve the problem]

The apparatus of the present invention includes a plurality of receiving circuits, a video signal recording circuit for recording a plurality of video signals processed by the receiving circuits, and a display for displaying the output of the video signal recording circuit as an image, and In a sonar receiving device in which the outputs of a plurality of receiving circuits are selected according to a cursor direction signal, and the selected signals are aurally processed so that an operator can hear them, a recording circuit for recording the outputs of the receiving circuits, and a recording circuit in the recording circuit. A readout control circuit that controls output to the listening circuit while repeating a process of cutting out the received signal in the vicinity specified by the signal at the time of transmission and the cursor range signal and splicing the signals continuously over time. be done.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the sonar receiving device of the present invention, in which 1 is a recording circuit, 2 is a readout control circuit, 3 is a changeover switch, and these are the parts added according to the present invention. This is a typical configuration of a conventional sonar receiving device.

The operation of the embodiment shown in FIG. 1 will be explained below.

In the embodiment shown in FIG. 1, the receiving circuit 4 is composed of N channels, and these N channels cover all directions of 360°. The received signals input to the N input terminals #1 to #N of the receiving circuit input terminal 12 are received and processed by the AGC circuit and band limiting circuit of the receiving circuit 4, and are divided into two systems: a video signal system and an audio signal system. is output to.

The video signal system performs processing such as detection and integration in a video signal processing circuit 5 with an N-channel configuration, and its output is sent to a video signal recording circuit 6.
The video signal is recorded so that the video can be displayed at all times. 7 is a CRT display, and 8 is a sweep signal generation circuit that generates a signal for synchronizing the reading of the video signal recording circuit 5 and the sweep of the CR7 display 7.

In the audible signal system, the output of the receiving circuit 4 is applied to the audible signal selection circuit 9, and the output of the receiving circuit in the direction desired by the operator is selected by the cursor direction signal applied to the cursor direction signal input terminal 13, and the audible signal is selected. After being subjected to frequency conversion and amplification processing in the processing circuit 10, the headphones 1
1 and is audible. FIG. 2 shows an example of a B-1 display as a typical image displayed on the CR7 display 7, in which the horizontal axis represents the direction and the vertical axis represents the distance.

In FIG. 2, the black dot shown within the visual frame at an azimuth of 45 degrees and a distance of 60 km is a signal indicating the echo sound from an underwater object, and the square frame around it is a cursor mark.

The operator can freely move this cursor mark using a cursor controller, and usually aligns the cursor mark with the target signal as shown in Figure 2 to precisely measure the direction and distance of the target signal, and also As described above, the receiving circuit containing the target signal is selected from among the plurality of receiving circuits according to the cursor's direction signal, and the signal is sent to the headset.

The recording circuit 1 and the readout control circuit 2 input the output signal of the receiving circuit as illustrated in FIG. 3, and as shown in FIG. A portion of the received signal designated by the distance signal is cut out and outputted to the listening signal selection circuit 9 via these changeover switches 3.

That is, the recording circuit 1 temporarily stores the outputs of all the receiving circuits, and extracts only the necessary signals from the outputs according to the control signal of the readout control circuit 2. The changeover switch 3 is a selection switch between the audible signal according to the present invention and the conventional audible signal, and is selected by the operator.

The transmitted signal indicated by T1 in Figures 3 and 4 serves as a reference signal when the operator searches for the target sound by hearing, and the operator usually uses the tone of the reference signal as a reference. The target sound is heard and judged whether it is the correct target sound or not, and what the Dobra frequency of the target is.

〔Effect of the invention〕

As explained above, the present invention adds a received signal recording circuit and its readout control circuit to a conventional sonar receiving device, so that an operator can receive images without worrying about the sonar transmission and reception cycles. It is possible to simultaneously use the visual sense caused by the sound and the sense of hearing caused by the sound, which has the effect of making it possible to search for underwater objects in an efficient manner.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the sonar receiving device of the present invention, FIG. 2 is an explanatory diagram showing an example of the B-SFU-1 display, FIG. 3 is a waveform diagram of a conventional audible signal, and FIG. FIG. 3 is a waveform diagram of an audible signal according to the present invention. 1... Recording circuit, 2... Readout control circuit, 3...
Changeover switch, 4... Receiving circuit, 5... Video signal processing circuit, 6... Video signal recording circuit, 7... Display device,
8... Sweep signal generation circuit, 9... Listening signal selection circuit, 10... Listening signal processing circuit, 11... Headphones, 12... Receiving circuit, 13... Cursor direction signal input terminal , 14...Cursor range signal input terminal.

Claims (1)

[Claims] It is composed of a plurality of receiving circuits, a video signal recording circuit that records a plurality of video signals processed by the receiving circuit, and a display that displays the output of the video signal recording circuit as a video, and the output of the plurality of receiving circuits. In a sonar receiving device that selects a direction signal using a direction signal from a cursor and performs aural processing so that an operator can hear it, there is a recording circuit that records the output of the receiving circuit, and a signal at the time of transmission in this recording circuit and the cursor. and a readout control circuit that controls output to the listening circuit while repeating a process of cutting out nearby received signals specified by the range signal and splicing them continuously in time, and generating an audio signal, A sonar receiving device characterized in that an operator can repeatedly listen to a received signal from one search ago in a direction and range specified by a cursor.