JP7370871B2 - Pulse signal analyzer and pulse signal analysis method - Google Patents

Description

This embodiment relates to a pulse signal analysis device and a pulse signal analysis method.

A conventional pulse signal analyzer that estimates the emission source of a pulse signal sequentially detects pulse regions (sections) from the received pulse signal and measures the interval time between the detected pulse and the pulses detected before and after the detected pulse. . Next, a coordinate system (hereinafter referred to as the Y-axis) in which the first coordinate axis (hereinafter referred to as the X-axis) is the interval between pulses detected in the front and the second coordinate axis (hereinafter referred to as the Y-axis) is the interval between pulses detected in the rear. The measured pulse interval times are sequentially plotted with respect to the XY coordinate system (hereinafter referred to as the XY coordinate system). Finally, the entire plotted XY coordinate system is imaged, features are determined from the distribution of the plots on the coordinates, and the emission source having the features is estimated.

In the analysis method of the pulse signal analyzer described above, two types of pulse trains with the same change in pulse interval (PI) detected from the pulse signal and different changes in pulse frequency are identified as the same emission source. There was a problem.

Japanese Patent Application Publication No. 2015-28447

As mentioned above, the conventional pulse signal analyzer can detect the pulse signal even if the change in the pulse interval time detected from the pulse signal is the same, even if the change in the pulse frequency is different. It was difficult to distinguish between different sources.

The present embodiment was developed in view of the above-mentioned problem, and is a pulse train that can easily estimate the emission source by identifying the characteristics of the pulse train when the frequency of the pulse detected from the pulse signal changes from pulse to pulse. An object of the present invention is to provide a signal analysis device and a pulse signal analysis method.

In order to solve the above problems, the pulse signal analysis device according to the present embodiment includes a detector, a frequency measuring device, a frequency plot device, a frequency plot image database, and an identification device. The detector sequentially detects pulse regions from the pulse signal to be analyzed. The frequency measuring device measures the frequency of pulses sequentially detected by the detector. The frequency plotting device described above measures the frequency of pulses with respect to the coordinate system of the frequency of the pulse immediately before the pulse to be plotted (X axis) and the frequency of the pulse immediately after the pulse to be plotted (Y axis) for pulses that are sequentially measured with a frequency measuring instrument. The results are sequentially plotted and a pattern image of the plotted coordinate system is generated as a frequency plot image. The frequency plot image database registers the frequency plot image generated by the frequency plot device as a characteristic image of the pulse signal emission source. The frequency plot identification device compares and matches the frequency plot image of the pulse signal to be analyzed with the frequency plot images registered in the frequency plot image database, determines the degree of similarity of the images, and identifies frequency plot images for which the degree of similarity exceeds a threshold value. and identify the corresponding pulse signal emission source.

FIG. 1 is a block diagram showing the configuration of a pulse signal analyzer according to a first embodiment. FIG. 2 is a diagram showing an example of a pulse frequency plot in the first embodiment. FIG. 3 is a block diagram showing the configuration of a pulse signal analysis device according to the second embodiment.

Embodiments will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing the configuration of a pulse signal analyzer according to a first embodiment. In FIG. 1, an antenna 11 receives incoming radio waves. The receiver 12 receives a signal in a predetermined frequency band from the incoming radio waves received by the antenna 11.

The pulse detector 13 detects a pulse region (section) from the received output of the receiver 12. The pulse frequency measuring device 14 measures the frequency of the pulse detected by the pulse detector 13. The pulse frequency plotting device 15 plots the frequency measurement result of the detected pulse with respect to the coordinate system of the frequency of the pulse received immediately before the pulse to be plotted (X axis) and the frequency of the pulse received immediately after the pulse (Y axis). A pattern image (hereinafter referred to as a plot image) of the plotted coordinate system is generated by sequentially plotting.

The plot image database 16 is a database in which plot images generated by the pulse frequency plot device 15 are registered as characteristic images. When registering, the plot image is given a name for the user to appropriately identify the emission source. The signal discriminator 17 compares the plot image of the received pulse train with plot images registered in the past in the plot image database 16, determines the degree of similarity of the images to be compared using a method such as pattern matching, and determines the degree of similarity. Plot images exceeding the threshold are identified and the name of the corresponding pulsed signal emission source is identified and displayed.

The operation of the pulse signal analyzer having the above configuration will be explained using FIG. 2.

A pulse detector 13 extracts only the pulse region of the signal received by the antenna 11 and receiver 12 . A pulse frequency measuring device 14 measures the frequency of the pulse detected by the pulse detector 13. The pulse frequency plotter 15 plots based on the frequency of the pulse received immediately before the pulse to be plotted and the frequency of the pulse received immediately after.

FIG. 2 shows an example of a pulse frequency plot. FIG. 2(a) shows a case where the pulse frequency is constant, and the plot point is fixed at one point. FIG. 2(b) shows a case where the pulse frequency increases monotonically, and the plot points are arranged on a straight line that rises to the right. FIG. 2(c) shows a case where the pulse frequency changes randomly, and plot points are arranged at random coordinate points. Note that when the frequency changes randomly, the characteristics of the plotted image change depending on whether it is a uniform distribution or a Gaussian distribution, so it is possible to Classification becomes possible.

A plot image generated by the pulse frequency plot is registered in the plot image database 16 as a characteristic image of the pulse signal emission source. The signal discriminator 17 compares the pulse train plot image of the received pulse signal with past plot images registered in the plot image database 16, and determines the similarity of the images by a technique such as pattern matching. As a result of the determination, the pulse signal with the maximum similarity exceeding the threshold is identified, and the name of the pulse signal emission source corresponding to the registered image is presented.

As described above, the pulse signal analysis device according to the present embodiment measures the frequency of each detected pulse, and images the pattern of frequency change of the pulses before and after the target pulse in a coordinate system. Here, the pulse signals from the emission source are compiled into a database in advance, and the plot image of the received pulse signal is matched with the pulse signal plot image of the emission source stored in the database. Thereby, even if the frequency of the pulse detected from the pulse signal changes from pulse to pulse, the emission source can be easily estimated by identifying the characteristics of the frequency change.

(Second embodiment)
Next, a second embodiment will be described with reference to FIG. 3. In FIG. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals, and redundant explanation will be omitted here.

FIG. 3 is a block diagram showing the configuration of a pulse signal analyzer according to the second embodiment. In FIG. 3, the antenna 11, receiver 12, pulse detector 13, pulse frequency measuring device 14, pulse frequency plotting device 15, plot image database 16, and signal discriminator 17 are the same as those shown in FIG. In this embodiment, a switch 18, a pulse interval time measuring device 19, a pulse interval time plotting device 20, a plot image database 21, and a signal discriminator 22 are added.

The switching device 18 outputs a pulse signal to the pulse frequency plotting device 15 when the output of the detected pulse changes according to the measurement result of the pulse frequency measuring device 14, and when the frequency of the detected pulse is constant, The pulse signal is output to the pulse interval time measuring device 19.

The pulse interval time measuring device 19 measures the pulse interval time of the input pulse signal and sends the measurement result to the pulse interval time plotting device 20 . The pulse interval time plotting device 20 measures the pulse interval with respect to a coordinate system in which the X axis is the interval time between pulses detected in front of the pulse to be analyzed and the Y axis is the interval time between pulses detected behind the pulse to be analyzed. The pulse interval times are sequentially plotted, the entire plotted XY coordinate system is imaged, and the image is stored in the plotted image database 21 as a characteristic image of the emission source. The signal discriminator 22 compares the interval time block image of the pulse signal to be analyzed with the plot image stored in the database 21, identifies the pulse signal whose similarity exceeds the threshold value and corresponds to the registered image. Provide the name of the pulse signal emission source.

According to the pulse signal analyzer having the above configuration, when the frequency changes for each pulse, the analysis is performed based on the frequency plot image, and when the frequency of the pulse is constant, the analysis is performed based on the plot image of the pulse interval time. Since it is analyzed, identification can be performed in combination with plot images of frequency and pulse interval, and improvement in identification ability can be expected.

In addition, in the description of the above embodiment, a case has been described in which a pulse signal received through an antenna is analyzed, but it is also possible to analyze a pulse signal input through another transmission path or a pulse signal recorded/reproduced. In this case, the pulse signal to be analyzed may be directly input to the pulse frequency measuring device 14.

In addition, the present invention is not limited to the above-described embodiments as they are, and in the implementation stage, the constituent elements can be modified and embodied without departing from the gist of the present invention. Moreover, various inventions can be formed by appropriately combining the plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, components from different embodiments may be combined as appropriate.

DESCRIPTION OF SYMBOLS 11... Antenna, 12... Receiver, 13... Pulse detector, 14... Pulse frequency measuring device, 15... Pulse frequency plot device, 16... Plot image database, 17... Signal identifier, 18... Switch, 19... Pulse interval Time measuring device, 20... Pulse interval time plotting device, 21... Plot image database, 22... Signal discriminator.

Claims (4)

a detector that sequentially detects pulse regions from a pulse signal to be analyzed;
a frequency measuring device that measures the frequency of pulses sequentially detected by the detector;
Regarding the pulses sequentially measured by the frequency measuring device, the frequency measurement results of the pulses are sequentially plotted in a coordinate system of the frequency of the pulse immediately before the pulse to be plotted (X axis) and the frequency of the pulse immediately after the pulse to be plotted (Y axis). and a frequency plot device that generates a pattern image of the plotted coordinate system as a frequency plot image;
a frequency plot image database that registers a frequency plot image generated by the frequency plot device as a characteristic image of a pulse signal emission source;
Comparing and collating the frequency plot image of the pulse signal to be analyzed with the frequency plot image registered in the frequency plot image database to determine the degree of similarity of the images, and identifying the frequency plot image whose degree of similarity exceeds a threshold value. , and a frequency plot identification device for identifying a corresponding pulse signal emission source. The pulse signal analysis device according to claim 1, further comprising a receiving device that detects the pulse signal to be analyzed from a received signal of an incoming radio wave. Further, an interval time measuring device that measures the interval time of pulses sequentially detected by the detector;
Regarding the interval times sequentially measured by the interval time measuring device, the interval times of the pulses are plotted with respect to the coordinate system of the interval time of the pulse immediately before the pulse to be plotted (X axis) and the interval time of the pulse immediately after the pulse to be plotted (Y axis). an interval time plotting device that sequentially plots measurement results and generates a pattern image of the plotted coordinate system as an interval time plot image;
an interval time plot image database that registers the interval time plot image generated by the interval time plot device as a characteristic image of the pulse signal emission source;
The interval time plot image of the pulse signal to be analyzed is compared with the interval time plot image registered in the interval time plot image database to determine the similarity of the images, and the interval time plot image has a similarity exceeding a threshold value. an interval time plot identification device for identifying a corresponding pulsed signal emission source;
The presence or absence of a frequency change in the pulses sequentially measured by the frequency measuring device is determined, and if there is a change, the pulse detected by the detector is output to the frequency plotting device, and if there is no change, the pulse detected by the detector is output to the frequency plot device. The pulse signal analysis device according to claim 1, further comprising a switch that outputs the detected pulse to the interval time measuring device. The pulse areas are sequentially detected from the pulse signal to be analyzed,
sequentially measuring the frequencies of the sequentially detected pulses;
Concerning the frequencies of the sequentially measured pulses, sequentially plot the frequency measurement results of the pulses with respect to a coordinate system of the frequency of the pulse immediately before the pulse to be plotted (X axis) and the frequency of the pulse immediately after the pulse to be plotted (Y axis), Generate a pattern image of the plotted coordinate system as a frequency plot image,
registering the frequency plot image as a characteristic image of the pulse signal emission source;
The frequency plot image of the pulse signal to be analyzed is compared with the registered frequency plot image to determine the similarity of the images, and the frequency plot image whose similarity exceeds a threshold is identified and the corresponding pulse signal is emitted. Pulse signal analysis method to identify sources.

Images