JPH01109280A - Sonar reverberation simulating device - Google Patents

Abstract

PURPOSE:To set diverse circumferential environments optionally by reproducing actually obtained sonar reverberation data and making required corrections. CONSTITUTION:A reproducing function part 1 receives a prescribed timing signal from an electronic computer 3, the storage contents of a ROM 12 are reproduced by a reproducing circuit 11, and sonar reverberation data in an actual case is stored in the ROM 12. Then a reverberation simulating function part 2 increases the reverberation effect of a sonar reverberation reproduction signal from the function part 1 and is constituted in ladder structure on the whole by connecting delay circuits 210-214, gain circuits 220-224, and adder circuits 230-234 in series in the order of, for example, the circuits 211, circuit 221, and adder circuit 231. Further, the circuits 210-214 simulate surface reverberation due to reflection from the sea surface, sea bottom part, etc., in a specific sea area and their delay items and gain extents are adjusted properly to accurately simulate variation of the sonar reverberation in the sea area. Then the output of the function part 2 is supplied as a simulation signal for the sonar reverberation to a proper utilizing device 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sonar reverberation simulating device, and particularly to a sonar simulating device for detection training of search targets such as schools of fish and submarines. This relates to the sonar reverberation simulator used.

[Prior Art] In order to realize this type of conventional sonar reverberation simulating device, the following two methods are known.

(1) Simulated sonar using an oscillator that generates a sine wave signal with a certain amplitude, an envelope generator that generates a predetermined envelope waveform signal, and a modulator that modulates the sine wave signal with the envelope waveform signal. 6 is an explanatory diagram of the first method of generating reverberation. An oscillator (61) generates a sine wave signal (a) of a certain amplitude and a modulator (61) generates a sine wave signal (a). 63), and is also applied to one input terminal of the envelope generator (63).
A predetermined envelope waveform signal (b) is generated from the modulator (62) and applied to the other input terminal of the modulator (63).

A modulated signal (e) of the sine wave signal (A) based on the envelope waveform signal (b) is output from the output terminal of the modulator (63).

(2) A second method is to operate an actual sonar device in a certain predetermined environment, record the sonar reverberation generated by the sonar device using a suitable recording device, and then play it back to generate reverberation.

According to the first method, by modulating a sine wave signal of a certain amplitude with a predetermined envelope waveform signal,
Although there is an advantage in that simulated sonar reverberations can be obtained relatively easily, in order to generate more realistic and complex sonar reverberations, the scale and configuration of the envelope generator used must be large and complex. Sometimes it becomes.

On the other hand, according to the second method, the sonar reverberations generated by operating an actual sonar device are recorded/played back, so the advantage is that more practical sonar reverberations can be used. However, recording and reproducing sonar reverberations from many locations requires a lot of time and effort, and it is difficult to respond accurately to changes in the environment of each location.

[Problems to be Solved by the Invention] As described above, when the conventional sonar reverberation simulating device uses the first method of generating simulated sonar reverberation, it also has a method for obtaining more realistic sonar reverberation. The device becomes larger and more complex, and the second method of recording and reproducing actual sonar reverberations requires a lot of time and effort to record and reproduce sonar reverberations at many locations. It is important to accurately respond to changes in the environment of each location! l
The problem was that it was difficult.

This invention was made to solve the above-mentioned problems, and provides a sonar reverberation simulating device that is compatible with the environment of the place where the sonar device is used and can generate more realistic sonar reverberations. The purpose is to obtain.

[Means for Solving the Problems] A sonar reverberation simulating device according to the present invention comprises a storage means in which actual sonar reverberation data is stored, and a reproduction circuit that reproduces the contents of the storage means in accordance with an external synchronization signal. and a reverberation simulating function section that makes necessary corrections to the sonar reverberation data reproduced by the reproduction function section.

[Operation] In the present invention, actually obtained sonar reverberation data is reproduced and necessary corrections are made.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a schematic configuration diagram showing a sonar reverberation simulator that is an embodiment of the present invention. In FIG. 1, a reproducing function section (1) includes a reproducing circuit (11) that receives a predetermined timing signal from an electronic computer (3) and reproduces the contents stored in a ROM (12), and an actual The ROM (12) stores the sonar reverberation data in the scene.
The timing signal transmitted to 11) corresponds to the synchronization signal of the sonar transmission pulse in the sonar device used, and the data stored in ROM (12) is stored under the condition of the shortest reverberation time. Below is a quantized version of the sonar reverberation actually recorded.

Next, the reverberation simulation function section (2)
The delay circuit (21°) is used to further enhance the reverberation effect of the sonar reverberation reproduction signal from the
(2L), gain circuits (22°) to (22,), and adder circuits (23°) to (23,), for example, the r-day 14 circuit (21,)-gain circuit. The (22,)-adder circuits are connected in series like (23,)J, and the overall structure is a ladder configuration.

Note that the delay time of the top stage delay circuit (21°) is actually 0, and the delay time of the bottom stage adder circuit (21°) is actually 0.
34) do not actually perform the addition function, so there is no harm in omitting them.

Also, the delay time τ, ~τ4 regarding the delay circuit (2L) ~ (214), and the gain circuit (22°) ~
The gain coefficients a0 to a4 regarding (-22,) are all set by the electronic computer (3). The delay circuits (21°) to (214) are for simulating surface reverberations caused by reflections from the sea surface, the seabed, etc. in a desired sea area, and adjust the delay time and gain level as appropriate. By doing so, changes in sonar reverberation in the sea area can be accurately simulated. The output from this reverberation simulation function section (2) is given to an appropriate utilization device (4) as a sonar reverberation simulation signal.

FIG. 2 is a diagram illustrating a training operation performed by a sonar simulator incorporating the above embodiment.

In FIG. 2, instructor A gives necessary instructions and data to the electronic calculator 11 (3) via the instructor's desk (21), sonar reverberation simulator (22) and target echo simulator (23).
) and noise simulator ff (24) are operated, and the outputs as a result of each operation are added in an adder (25) and then applied to the sonar signal processing device (26) in front of trainee B. Trainee B uses this sonar signal processing device (2
6) Training operations will be performed based on the audiovisual signals provided by.

FIG. 3 is a diagram illustrating waveforms at each part of the system illustrative diagram of FIG. 2. In this Figure 3, Figure 3(a) is the output signal of the sonar reverberation simulator (22), Figure 3(b) is the output signal of the target echo simulator (23), and Figure 3(c) is the output signal of the target echo simulator (23).
3(d) shows the output signal of the noise simulator (24), FIG. 3(d) shows the output signal of the adder (25) e, and FIG. 3(e) shows the auditory signal of the sonar signal processing device (26), respectively. It is something.

FIG. 4 is a diagram illustrating the operation of an actual sonar device, and is intended to contribute to understanding of the embodiment of the present invention. Moreover, FIG. 5 is a signal waveform diagram in FIG. 4 above, where FIG. 5(1) is a waveform diagram of a transmitted signal, and FIG. 5(b) is a waveform diagram of a received signal. . In FIGS. 4 and 5, an anti-submarine helicopter (41) is equipped with a sonar signal processing device (42), which is operated as required by a crew member (43). From this anti-submarine helicopter (41), a sonar transmitting/receiving section (45) consisting of a sonar receiving section (45m) and a sonar transmitting section (45b),
It is suspended in the sea by a cable (44).

Then, the required ultrasonic transmission signal is emitted from the sonar transmitter (45b) within a short time. This ultrasonic transmission signal is transmitted by volumetric reverberation based on the presence of surrounding seawater, the seafloor surface (47)
Reverberation (51) is a mixture of surface reverberation based on reflection from the sea surface (48), and a submarine as a detection target (48).
6) and the noise picked up underwater (53).
) is received by the sonar receiver (45m) as underwater sound mixed with The signal from this sonar receiver (45m) is sent to the anti-submarine helicopter (41) via a cable (44).
) sonar signal processing device inside! (42).

Then, the crew member (43) confirmed the target based on audio and visual information.
Detection is done.

[Effects of the Invention] As explained above, the sonar reverberation simulating device according to the present invention has a storage means in which actual sonar reverberation data is stored, and a reproduction method that reproduces the contents of the storage means in accordance with an external synchronization signal. and a reverberation simulating function section that makes necessary corrections to the sonar reverberation data reproduced in the reproduction function section. By reproducing and making necessary modifications, various surrounding environments can be arbitrarily set, and a sonar reverberation simulating device with higher training effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a sonar reverberation simulating device which is an embodiment of the present invention, and FIG. 2 is a diagram illustrating a system for explaining training operations by the sonar simulating device incorporating the above-mentioned embodiment. , FIG. 3 is a diagram illustrating waveforms at each part of the system diagram in FIG. 2, FIG. 4 is a diagram illustrating the operation of an actual sonar device, and FIG. FIG. 6 is a circuit configuration diagram for explaining the prior art.・ (1) is a reproduction function section, (11) is a reproduction circuit, (12) is a ROM, (2) is a reverberation simulation function section, (21°) to (21
, ) are delay circuits, (22°) to (224) are gain circuits, (23°) to (234) are adder circuits, (3) is an electronic computer, and (4) is a utilization circuit. In addition, the same reference numerals in the figures refer to the same or corresponding parts @Figure 2 and Figure 4.

Claims (2)

[Claims] (1) A reproducing function unit consisting of a storage means in which actual sonar reverberation data is stored, and a reproducing circuit that reproduces the contents of the storage means in accordance with an external synchronization signal; and A sonar reverberation simulating device comprising: a reverberation simulating function section that performs necessary corrections on sonar reverberation data. (2) The reverberation simulating function section includes a delay circuit that provides a required delay, a gain circuit that provides a required gain, and an adder circuit, which are connected in series in an appropriate number of stages in parallel for the reproduced sonar reverberation data. 2. The sonar reverberation simulating device according to claim 1, wherein the sonar reverberation simulating device has a ladder configuration.