JP6834577B2 - Signal information display, detection system and program - Google Patents

Description

The present invention relates to a signal information display device, a detection system, and a program for causing a computer to acquire information including an arrival direction of a signal received by a detection device such as a sonar device.

Conventionally, a display device for grasping the arrival direction of a signal received by an acoustic sensor provided in a detection device such as a sonar device has been known. This display device performs phase adjustment processing and frequency analysis in any direction with respect to the signal received from the detector. The display device displays the signal obtained by the frequency analysis process by, for example, BTR (Bearing Time Recording), BL (Bearing Level), monitoring LOFAR (Low Frequency Analysis Recorder), or the like.

The BTR display is a graph showing the change over time in the signal strength for each direction. Normally, the vertical axis of the BTR graph is time and the horizontal axis is azimuth. In the BTR display, the signal strength is represented by shading. The darker the displayed color, the higher the signal strength. The BL display is a graph showing the signal strength for each direction. Normally, the vertical axis of the BL graph is the intensity, and the horizontal axis is the orientation. The monitoring LOFAR display displays a plurality of LOFARs having different directions side by side. The LOFAR display is a graph showing the change over time in the signal strength for each frequency. From these display results, the user can grasp the signal strength for each direction.

In addition, some display devices include an automatic detection process for detecting a signal having a strength equal to or higher than a preset value. Such a display device performs a frequency analysis result on a signal having a intensity equal to or higher than a preset value, and observes a time change in the direction and intensity of the signal. Then, the display device performs frequency analysis on the direction of the signal detected by the automatic detection process, and displays the output LOFAR as the tracking LOFAR. The tracking LOFAR is a graph showing the time course of the signal to be tracked, with the vertical axis representing time and the horizontal axis representing frequency.

By referring to the tracking LOFAR display, the user can acquire the frequency change of the signal generated from the sound source by the visual integration effect. Further, when a signal is generated from the sound source other than the signal of interest, the user has acquired frequency information of a weak signal other than the signal of interest by the visual integration effect.

An example of a conventional display device is disclosed in Patent Document 1. Patent Document 1 discloses a display device that displays a time-axis compression process that integrates frequency-analyzed LOFAR gram data in the time-axis direction. According to Patent Document 1, this device averages a signal having a weak output level such that it is displayed as a dot with low brightness on a CRT (Cathode Ray Tube), and the user can easily see it as a line. It is stated that it will be possible.

Japanese Unexamined Patent Publication No. 2000-171547

In the device disclosed in Patent Document 1, when the signal has a high SN ratio, the signal direction can be acquired by the automatic detection process, but when the signal is a weak signal having a low SN ratio, the signal is obtained by the automatic detection process. It is not detected and the signal direction cannot be acquired. Further, since the signal direction cannot be obtained from the BTR display and the BL display, the user needs to obtain the signal direction from the monitoring LOBAR display.

However, when the direction is acquired from the monitoring LOFAR display, it is difficult to obtain the accurate arrival direction of the signal because the displayed directions are scattered. Therefore, it is not possible to create a tracking LOFAR that matches the direction of the signal, and it is difficult to acquire a weak signal frequency change.

The signal information display device according to the present invention includes a display unit that displays monitoring signal information indicating the frequency strength of a signal for each direction, a signal information acquisition unit that acquires the frequency and direction of a predetermined signal from the monitoring signal information, and a predetermined one. based on the person-position of the signals for a plurality of orientations of successive apart a predetermined angle, it generates information indicating the orientation change of the signal intensity for each frequency, the time information acquisition unit that acquires the time of the signal from the generated information Then, the frequency analysis result for the signal of the past predetermined time from the time acquired by the time information acquisition unit is integrated with the time as an integrating variable for each direction of a plurality of directions, and the signal after the integration process is interpolated in the directional direction. Then, the signal direction change display processing unit that generates signal direction interpolation information indicating continuous signal strength in the direction direction and displays it on the display unit, and the peak direction that is the direction in which the signal is maximized are acquired from the signal direction interpolation information. It is provided with a tracking information display processing unit that performs frequency analysis processing of a signal in the peak direction and displays information indicating the frequency intensity of the signal to be tracked for each time on the display unit.

The detection system according to the present invention includes a sonar device that receives an incoming sound wave, and the signal information display device that receives a signal of the sound wave received by the sonar device as a signal to be processed.

The program according to the present invention uses the computer as a means for displaying monitoring signal information indicating the frequency strength of a signal for each direction, a means for acquiring a predetermined signal frequency and direction from the monitoring signal information, and a predetermined signal . A means of generating information indicating a change in the direction of the signal strength for each frequency for a plurality of consecutive directions separated by a predetermined angle based on the position, and acquiring the signal time from the generated information, and the past from the acquired time. The frequency analysis result for the signal of the predetermined time is integrated with the time as an integrating variable for each direction of a plurality of directions, and the signal after the integration process is interpolated in the directional direction to show the signal strength continuous in the directional direction. A means for generating and displaying azimuth interpolation information, a peak azimuth that is the azimuth at which the signal is maximized is acquired from the signal directional interpolation information, frequency analysis processing of the signal at the peak azimuth is performed, and the frequency intensity of the signal to be tracked is determined. It is intended to function as a means for displaying information shown for each hour.

The present invention identifies the orientation of a weak signal by performing interpolation processing in the azimuth direction and the frequency direction with reference to the specified frequency and orientation for the weak signal, and provides information indicating the frequency strength of the signal for each orientation. It can be displayed, and information on the direction of arrival of a weak signal and the time change of frequency can be obtained.

It is a block diagram which shows one configuration example of the signal information display device which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the information displayed by the display part shown in FIG. It is a figure which shows the example of the information displayed by the display part shown in FIG. It is a figure which shows the example of the information displayed by the display part shown in FIG. It is a figure which shows the example of the information displayed by the display part shown in FIG. It is a flowchart which shows the operation procedure of the information processing unit shown in FIG. It is a flowchart which shows the procedure about the process of step S104 shown in FIG. It is a figure which shows an example of the bearing LOBAR display shown in FIG. It is a flowchart which shows the procedure about the process of step S105 shown in FIG. It is a figure which shows an example of the BL display which the BL display processing unit shown in FIG. 1 displays on the display unit. It is a flowchart which shows the procedure about the process of step S106 shown in FIG. This is an example of the tracking LOBAR display displayed on the display unit by the weak signal tracking LOWAR display processing unit shown in FIG. It is a block diagram which shows one structural example of the detection system which concerns on Embodiment 2 of this invention.

Embodiment 1.
The configuration of the signal information display device of the first embodiment will be described. FIG. 1 is a block diagram showing a configuration example of a signal information display device according to a first embodiment of the present invention.
As shown in FIG. 1, the signal information display device 1 is an information processing device having an input unit 10, an information processing unit 20, and a display unit 30. The information processing unit 20 includes a phase adjustment processing unit 21, a frequency analysis processing unit 22, an automatic detection processing unit 23, a tracking LOBAR display processing unit 24, a signal information acquisition unit 25, a time information acquisition unit 26, and a BL. It has a display processing unit 27 and a weak signal tracking LOBAR display processing unit 28.

The information processing unit 20 is provided with a memory (not shown) for storing a program and a CPU (Central Processing Unit) (not shown) for executing processing according to the program. When the CPU executes the program, the phase adjustment processing unit 21, the frequency analysis processing unit 22, the automatic detection processing unit 23, the tracking LOFAR display processing unit 24, the signal information acquisition unit 25, the time information acquisition unit 26, and the BL display processing unit The signal information display device 1 includes 27 and a weak signal tracking LOFAR display processing unit 28. The memory holds information received from the input unit 10, and stores information on the process of arithmetic processing executed by the CPU and the result of arithmetic processing.

Information on sound waves from a plurality of acoustic sensors is sequentially input to the input unit 10 from a sonar device (not shown) with the passage of time. The input unit 10 transmits the information of the input sound wave to the phase adjustment processing unit 21. The sequentially input sound wave signals are held in the memory in the information processing unit 20 for a predetermined time within a range not exceeding the memory capacity. When the capacity of the memory exceeds the capacity of the sound wave information, the memory erases the oldest information according to the FIFO (First In First Out) and stores the newly input information. Further, when the user's instruction for the process executed by the information processing unit 20 is input, the input unit 10 transmits the content of the instruction input by the user to the information processing unit 20.

When the phase adjusting processing unit 21 receives the sound wave signal from the input unit 10, the phase adjusting processing unit 21 gives a required time delay or phase compensation to the signal output from each acoustic sensor so as to correct the signal propagation time difference for each acoustic sensor. Processing is performed and the signal strength for an arbitrary direction is calculated. The frequency analysis processing unit 22 performs frequency analysis processing on the processing result of the phase adjustment processing unit 21, and causes the display unit 30 to display the result of the analysis processing as BTR, BL, and monitoring LOWAR. The monitoring LOFAR corresponds to the monitoring signal information indicating the frequency strength of the signal for each direction.

The automatic detection processing unit 23 detects the direction of the signal whose signal strength is equal to or higher than the preset first threshold value by observing the time change of the direction and the strength of the signal. The tracking LOBAR display processing unit 24 performs frequency analysis of the signal direction input from the automatic detection processing unit 23, and displays the tracking LOCAR on the display unit 30 as the output.

When the signal information acquisition unit 25 receives the information on the direction and frequency specified by the user via the input unit 10, the signal information acquisition unit 25 notifies the time information acquisition unit 26 of the received information on the direction and frequency. The time information acquisition unit 26 refers to the monitoring LOFAR, and is separated by a predetermined angle from the direction notified by the signal information acquisition unit 25 with respect to the predetermined frequency range of the frequency notified from the signal information acquisition unit 25. Obtain LOFARs in adjacent directions from monitoring LOFARs. The predetermined angle is, for example, 5 to 10 °. In addition, the time information acquisition unit 26 generates a bearing LOFAR in which the acquired LOFARs are arranged side by side in the order of the directions and displays them on the display unit 30. When the time information acquisition unit 26 receives the information of the time specified by the user via the input unit 10, the time information acquisition unit 26 notifies the BL display processing unit 27 of the information of the specified time. Bearing LOFAR corresponds to signal strength directional change information.

The time information acquisition unit 26 may detect a signal from the bearing LOBAR and notify the BL display processing unit 27 of the time information of the detected signal even if the time is not specified by the user. As a signal detection method, for example, a second threshold value that is larger than the noise level and smaller than the first threshold value is set in advance, and the time information acquisition unit 26 sets the time of the signal whose signal strength is larger than the second threshold value by Bearing LOFAR. A method of identification is conceivable.

When the BL display processing unit 27 acquires the time information from the time information acquisition unit 26, the BL display processing unit 27 obtains the frequency analysis result of the past predetermined time from the acquired time for each of the plurality of orientations used in the Bearing LOFAR. Obtained from 22. The predetermined time is, for example, several seconds. The BL display processing unit 27 integrates the frequency analysis output for the past several seconds for each direction. The BL display processing unit 27 acquires continuous BL by interpolating the result of the integration process in the directional direction. In the interpolation process, for example, a quadratic curve approximation is performed. The BL display processing unit 27 causes the display unit 30 to display the output result after the interpolation processing as BL. The BL at this time corresponds to the signal direction interpolation information indicating the signal strength continuous in the direction direction after the signal is interpolated in the direction direction. The BL display processing unit 27 corresponds to a signal direction change display processing unit that generates signal direction interpolation information.

The weak signal tracking LOBAR display processing unit 28 acquires the peak direction, which is the direction in which the signal strength is maximized, from the BL, performs frequency analysis of the signal in the acquired peak direction, and displays the result of the analysis processing as the tracking LOWAR. Display at 30. The tracking LOFAR corresponds to the tracking signal information indicating the frequency intensity of the signal to be tracked for each direction. The weak signal tracking LOBAR display processing unit 28 corresponds to the tracking information display processing unit that generates the tracking LOWAR.

In the functional block diagram shown in FIG. 1, in order to explain the function provided by the information processing unit 20, a configuration for performing tracking LOCAR display processing is shown in a different configuration depending on whether or not a signal is automatically detected. However, either configuration may perform both processes. Further, although it has been described that the BL display processing unit 27, the tracking LOBAR display processing unit 24, and the weak signal tracking LOBAR display processing unit 28 perform the frequency analysis processing, the frequency analysis processing unit 22 may execute the processing. Further, the user may specify the peak direction by referring to the BL display displayed on the display unit 30 by the BL display processing unit 27.

Next, the operation of the signal information display device shown in FIG. 1 will be described.
2 to 5 are diagrams showing an example of information displayed by the display unit shown in FIG. 1. FIG. 6 is a flowchart showing an operation procedure of the information processing unit shown in FIG.

When the phase adjusting processing unit 21 receives the sound wave signal received from the input unit 10, the phase adjusting processing unit 21 performs the phase adjusting processing on the sound wave signal and calculates the signal strength for an arbitrary direction (step S101). Subsequently, the frequency analysis processing unit 22 performs frequency analysis processing on the processing result of the phase adjusting processing unit 21 (step S102), and displays the result of the analysis processing on the display unit 30 as a monitoring LOCAR (step S103). At that time, the frequency analysis processing unit 22 may display the BTR and BL on the display unit 30.

FIG. 2 is an example of the BTR display 31 shown in FIG. FIG. 3 is an example of the BL display 32 shown in FIG. FIG. 4 is an example of the monitoring LOCAR display 34 shown in FIG. FIGS. 2 to 4 show that a strong signal is detected. By referring to the BTR display 31, the BL display 32, and the monitoring LOFAR display 34, the user can grasp the change in the direction, the frequency, and the frequency change of the strong signal.

Here, when the strength of the signal that can be clearly identified on the BTR display 31, the BL display 32, and the monitoring LOCAR display 34 is equal to or higher than the first threshold value, the automatic detection processing unit 23 detects the direction of the signal. The tracking LOCAR display processing unit 24 performs frequency analysis of the signal direction notified from the automatic detection processing unit 23, and displays the tracking LOBAR on the display unit 30 as the output. FIG. 5 is an example of the tracking LOCAR display 33 shown in FIG.

Referring to FIG. 5, the signal X1 clearly identified in the BTR display 31, the BL display 32 and the monitoring LOCAR display 34 appears in the tracking LOWAR display 33. On the other hand, referring to the tracking LOCAR display 33, it can be seen that the weak signal X2 is detected. However, in the tracking LOCAR display 33 shown in FIG. 5, it is difficult to grasp the frequency change of the signal X2 because the intensity of the signal X2 is weak. Even if an attempt is made to confirm the direction corresponding to the signal X2 on the monitoring LOBAR display 34 shown in FIG. 4, it is difficult to obtain an accurate arrival direction of the signal because the displayed directions are scattered. Therefore, in the first embodiment, the information processing unit 20 executes steps S104 to S106.

The process in step S104 shown in FIG. 6 will be described. FIG. 7 is a flowchart showing a procedure for the process of step S104 shown in FIG. When the user confirms a weak signal on the monitoring LOBAR display 34, the user acquires the frequency f and the approximate direction θ3 of the signal from the monitoring LOBAR display 34. The user inputs the direction θ3 as the designated direction and the frequency f as the designated frequency via the input unit 10 (step S141).

When the signal information acquisition unit 25 receives the information on the direction θ3 and the frequency f specified by the user via the input unit 10, the signal information acquisition unit 25 notifies the time information acquisition unit 26 of the received information on the direction and frequency f. The time information acquisition unit 26 refers to the monitoring LOFAR display 34, and has a predetermined frequency range of the frequency notified by the signal information acquisition unit 25, centered on the direction notified by the signal information acquisition unit 25, and only at a predetermined angle. LOBARs in distant and adjacent directions θ1 to θ5 are acquired from the monitoring LOBAR. Here, θ1, θ2, θ4 and θ5 are used as the directions adjacent to the direction θ3, but there may be two directions, θ2 and θ4. Subsequently, the time information acquisition unit 26 generates a bearing LOBAR in which LOWARs in adjacent directions θ1 to θ5 are arranged side by side with the frequency f and the direction θ3 as the center (step S142). Then, the time information acquisition unit 26 displays the generated Bearing LOCAR on the display unit 30 (step S143).

FIG. 8 is a diagram showing an example of the bearing LOBAR display shown in FIG. As shown in FIG. 8, in the Bearing LOBAR display 35, for the LOWAR display in a plurality of directions, the limited frequency bands in which the signals exist are arranged side by side so as to have the same time axis. The display is such that you can check the change in the orientation of.

Next, the process in step S105 shown in FIG. 6 will be described. FIG. 9 is a flowchart showing a procedure for the process of step S105 shown in FIG.
The user refers to the Bearing LOBAR display 35, acquires the time of the signal X2 to be tracked, and inputs the acquired time to the input unit 10 as a designated time (step S151). When the time information acquisition unit 26 receives the information at the designated time via the input unit 10, the time information acquisition unit 26 notifies the BL display processing unit 27 of the information at the designated time.

When the BL display processing unit 27 acquires the information of the specified time from the time information acquisition unit 26, the BL display processing unit 27 refers to the bearing LOBAR display 35 and performs frequency analysis for the past several seconds from the specified time in each direction of θ1 to θ5 (step). S152). Here, the BL display processing unit 27 may acquire the result of the frequency analysis processing from the frequency analysis processing unit 22. Subsequently, the BL display processing unit 27 integrates the frequency analysis output for the past several seconds from the designated time in each direction of θ1 to θ5 (step S153). Then, the BL display processing unit 27 interpolates the data after the integration processing (step S154). In the interpolation process of step S154, the BL display processing unit 27 acquires continuous BL by interpolating the result of the integration process in the directional direction. The BL display processing unit 27 causes the display unit 30 to display the output result after the interpolation processing as BL (step S155).

FIG. 10 is a diagram showing an example of BL display displayed on the display unit by the BL display processing unit shown in FIG. In the BL display 36 shown in FIG. 10, since the weak signal X2 is focused on and processed, those having a signal strength of the first threshold value or more are omitted from the processing target. Further, the BL display 36 shown in FIG. 10 is different from the BL display 32 showing the scale of the intensity on the vertical axis in FIG. 3, and the range of the intensity is expanded.

Next, the process in step S106 shown in FIG. 6 will be described. FIG. 11 is a flowchart showing a procedure for the process of step S106 shown in FIG.
The user refers to the BL display 36, acquires the peak direction of the signal, and inputs the acquired peak direction as the designated direction to the input unit 10 (step S161). The weak signal tracking LOBAR display processing unit 28 performs frequency analysis processing of the signal in the designated direction (step S162), and displays the result of the analysis processing on the display unit 30 as the tracking LOWAR (step S163).

FIG. 12 is an example of the tracking LOBAR display displayed on the display unit by the weak signal tracking LOWAR display processing unit shown in FIG. As shown in FIG. 12, since the tracking LOBAR display 37 displays the LOWAR of the signal X2 in the target direction, the user can acquire a weak frequency change of the signal X2. In addition, the user can acquire frequency information of other weak signals from the tracking LOFAR display 37 shown in FIG. 12 by the visual integration effect.

The signal information display device 1 of the first embodiment has a display unit 30 for displaying the monitoring LOFAR, a signal information acquisition unit 25 for acquiring the frequency and direction of a predetermined signal from the monitoring LOFAR display 34, and a frequency of the predetermined signal. A time information acquisition unit 26 that generates a Bearing LOFAR display 35 indicating a change in the direction of the signal strength for each frequency and acquires the signal time for adjacent directions separated by a predetermined angle with reference to the direction and the acquired time. The BL display processing unit 27, which integrates the frequency analysis results of the past predetermined time from the above, generates the BL display 36 interpolated in the directional direction and displays it on the display unit 30, and the frequency analysis processing of the signal in the peak direction from the BL display 36. This unit includes a weak signal tracking LOFAR display processing unit 28 that displays a tracking LOFAR indicating the frequency intensity of the signal to be tracked for each direction on the display unit.

According to the first embodiment, for a weak signal that cannot be detected by the BTR display and the automatic detection process, the frequency and the direction are specified, and the directional direction and the frequency direction are interpolated with the specified frequency and the direction as a reference. Therefore, it is possible to specify the direction of a weak signal and display the tracking LOFAR according to the direction of the signal. Therefore, it is possible to acquire not only the arrival direction of the weak signal generated from the sound source but also the time change of the frequency. Furthermore, frequency information of other weak signals can be acquired.

The signal information processing procedure described in the first embodiment may be described in a computer program, or the program may be recorded in a recording medium. Further, the program may be installed in a computer, and the computer may be made to execute the function of the signal information display device 1 described in the first embodiment.

Embodiment 2.
The second embodiment is a detection system including the signal information display device 1 described in the first embodiment. In the second embodiment, the same reference numerals are given to the same configurations as those described in the first embodiment, and detailed description thereof will be omitted.

The configuration of the detection system according to the second embodiment will be described. FIG. 13 is a block diagram showing a configuration example of the detection system according to the second embodiment of the present invention.
The detection system 100 shown in FIG. 13 includes a sonar device 50 and a signal information display device 1. The sonar device 50 is mounted on a ship such as a submarine and a surface ship, for example. The sonar device 50 is connected to the signal information display device 1. Upon receiving the incoming sound wave signal, the sound wave signal is transmitted to the signal information display device 1. The sonar device 50 may include a plurality of acoustic sensors that receive sound waves.

According to the second embodiment, the signal information display device 1 is mounted on the ship, and the same effect as that described in the first embodiment can be obtained. Therefore, the operator on the ship can quickly acquire the information on the direction of the weak signal.

1 Signal information display device, 10 Input unit, 20 Information processing unit, 21 Phase adjustment processing unit, 22 Frequency analysis processing unit, 23 Automatic detection processing unit, 24 Tracking LOCAR display processing unit, 25 Signal information acquisition unit, 26 Time information acquisition Unit, 27 BL display processing unit, 28 weak signal tracking LOFAR display processing unit, 30 display unit, 31 BTR display, 32 BL display, 33 tracking LOFAR display, 34 monitoring LOFAR display, 35 LOFAR display, 36 BL display, 37 tracking LOFAR Display, 50 sonar device, 100 detection system, X1, X2 signals.

Claims (3)

A display unit that displays monitoring signal information that shows the frequency strength of the signal for each direction,
A signal information acquisition unit that acquires the frequency and direction of a predetermined signal from the monitoring signal information, and
Based on the person-position of the predetermined signal, the plurality of orientations of successive apart a predetermined angle, time information generates information indicating the orientation change of the signal intensity for each frequency, acquires the time of the signal from the generated information Acquisition department and
The frequency analysis result for the signal at a predetermined time in the past from the time acquired by the time information acquisition unit is integrated with the time as an integrating variable for each direction of the plurality of directions, and the signal after the integration process is interpolated in the directional direction. Then, a signal directional change display processing unit that generates signal directional interpolation information indicating continuous signal strength in the directional direction and displays it on the display unit, and
The peak direction, which is the direction in which the signal is maximized, is acquired from the signal direction interpolation information, frequency analysis processing of the signal at the peak direction is performed, and information indicating the frequency intensity of the signal to be tracked for each time is displayed on the display unit. The tracking information display processing unit to be displayed and
Signal information display device equipped with. A sonar device that receives incoming sound waves,
The signal information display device according to claim 1, wherein a sound wave signal received by the sonar device is input as a signal to be processed.
Detection system with. Computer,
A means of displaying monitoring signal information indicating the frequency strength of a signal for each direction,
A means for acquiring the frequency and direction of a predetermined signal from the monitoring signal information, and
Based on the person-position of the predetermined signal, the plurality of orientations of successive predetermined angle apart, means for generating information indicating the orientation change of the signal intensity for each frequency, acquires the time of the signal from the generated information ,
The frequency analysis result for the signal at a predetermined time in the past from the acquired time is integrated with the time as an integrating variable for each of the plurality of directions, and the integrated signal is interpolated in the directional direction to obtain the directional direction. A means for generating and displaying signal direction interpolation information indicating continuous signal strength, and
As a means for acquiring the peak direction, which is the direction in which the signal is maximized, from the signal direction interpolation information, performing frequency analysis processing of the signal at the peak direction, and displaying information indicating the frequency intensity of the signal to be tracked for each time. A program to make it work.

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