JP4544869B2 - Radio monitoring device used for radio wave source identification using radio holography method and MUSIC method - Google Patents

Description

  The present invention relates to a radio wave monitoring apparatus used for specifying a radio wave source that radiates, for example, illegal radio waves.

  As is well known, a conventional radio wave monitoring apparatus estimates a radio wave source using the MUSIC method (see, for example, Patent Document 1). However, the radio wave monitoring apparatus using the MUSIC method is easily affected by multipath.

Therefore, for example, after estimating the approximate position of the radio wave source and trying to estimate the radio wave source again from the vicinity of the radio wave source, if the building is crowded, the radio wave source cannot be estimated by multipath.
On the other hand, in the past, the position of the radio wave source was roughly estimated by the radio wave monitoring device, and finally the radio wave source was identified by, for example, the worker visually searching for the radio wave source antenna. The place by the skill of was big.
JP 2001-242232 A

In the conventional radio wave monitoring apparatus, there is a problem that it is difficult to estimate the position accurately due to the influence of multipath when the radio wave source is located in a densely populated area.
The present invention has been made to solve the above problem, and provides a radio wave monitoring device capable of accurately estimating the position of a radio wave source even when the radio wave source is located in a dense area of a building. With the goal.

  In order to achieve the above object, according to the present invention, in a radio wave monitoring device for estimating a position of a radio wave source, a first calculation means for performing radio wave measurement by a radio holography method using a received signal of an incoming radio wave, Based on the measurement result obtained by the first computing means, area estimation means for obtaining an area where the radio wave source is likely to be located, and the MUSIC method using the received signal of the incoming radio wave for the area obtained by this area estimation means And a second calculating means for estimating the position of the radio wave source.

  As described above, in the present invention, the radio wave holography method is used to measure the radio wave by using the received signal of the incoming radio wave, and based on the measurement result, the region where the radio wave source is likely to be located is obtained. For the area, the position of the radio wave source is estimated by the MUSIC method using the received radio wave signal.

  Therefore, according to the present invention, prior to the MUSIC method that is susceptible to multipath, the position of the radio wave source is roughly narrowed down by radio wave measurement by the radio holography method, and the narrowed area is accurately measured by the MUSIC method. Therefore, it is possible to provide a radio wave monitoring apparatus that can quickly and accurately specify the position of a radio wave source even if the radio wave source is located in a dense area of a building, for example.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration of a radio wave monitoring apparatus according to an embodiment of the present invention.
The radio wave monitoring apparatus includes an array antenna 11 to 1n, a high frequency processing system 20, an A / D processing system 30, a DSP processing system 40, a CPU processing system 50, a monitor 60, an input device 70, and a storage device 80.

The high-frequency processing system 20 down-converts the signals received by the array antennas 11 to 1n into baseband signals, and then outputs them to the A / D processing system 30, respectively.
The A / D processing system 30 converts the received signals of the array antennas 11 to 1n input through the high-frequency processing system 20 from analog signals to digital signals, and outputs the conversion results to the DSP processing system 40 as received data. .

  The DSP processing system 40 selectively performs DSP processing of the radio holography method and the MUSIC method on the received data given from the A / D processing system 30 in accordance with an instruction from the CPU processing system described later. is there. Data obtained by this processing is output to the CPU processing system 50.

  The CPU processing system 50 controls each part of the radio wave monitoring device in an integrated manner, and based on data obtained by the DSP processing system 40 in accordance with instructions from an operator through an input device 70 such as a keyboard, An image for specifying the source is displayed on the monitor 60. The CPU processing system 50 includes a memory 51 and a hard disk (HDD) 52 for storing data provided from the DSP processing system 40.

  Next, the operation of the radio wave monitoring apparatus having the above configuration will be described. FIG. 2 is a flowchart for explaining the control operation of the CPU processing system 50, and will be described below with reference to this flowchart.

  First, in step 2a, the CPU processing system 50 instructs the DSP processing system 40 to execute DSP processing by the radio holography method, and then proceeds to step 2b. As a result, the DSP processing system 40 performs a radio wave holography DSP process on the received data provided from the A / D processing system 30. Data obtained by this processing is output to the CPU processing system 50.

  In step 2b, the CPU processing system 50 displays, on the monitor 60, an image in which radio waves are visualized in association with a spatial position by the holography method based on the data given from the DSP processing system 40, and proceeds to step 2c. .

  In step 2c, the CPU processing system 50 accepts designation of the area of the radio wave source from the operator through the input device 70, and proceeds to step 2d. At this time, the operator designates an area based on the video visualized and displayed on the monitor 60 in step 2b.

  In step 2d, the CPU processing system 50 instructs the DSP processing system 40 to execute the DSP processing by the MUSIC method for the area specified in step 2c, and proceeds to step 2e. Thereby, the DSP processing system 40 performs the DSP processing by the beam space type MUSIC method by using the reception data corresponding to the area specified in step 2c among the reception data given from the A / D processing system 30. To do. Data obtained by this processing is output to the CPU processing system 50.

  In step 2e, based on the data given from the DSP processing system 40, the CPU processing system 50 superimposes the radio wave source on the monitor 60 by superimposing the positional relationship on the image already displayed by the holography method. Is displayed, and the process ends.

  As described above, the radio wave monitoring apparatus having the above-described configuration displays an image in which radio waves are visualized by the radio holography method, and performs a radio wave source estimation process by the MUSIC method to display the radio wave source estimated. I have to.

  Therefore, according to the radio wave monitoring apparatus having the above-described configuration, it is possible to display the image of the radio wave visualized by the radio holography method and the position of the radio wave source estimated by the MUSIC method. Therefore, the radio wave source can be specified based on the two displays. it can.

  In the radio wave monitoring apparatus having the above-described configuration, first, an image in which radio waves are visualized by the radio holography method is displayed, and the radio source is estimated by the MUSIC method for the area specified by the operator. The display showing the position of the radio wave source is performed.

  Therefore, according to the radio wave monitoring apparatus having the above-described configuration, the radio wave source and the multipath emission source can be roughly obtained by the radio holography method, and the radio wave source can be estimated with high accuracy by the MUSIC method in the region specified by the operator. .

  Further, in the radio wave monitoring apparatus having the above-described configuration, the radio wave holography method and the radio wave source display by the MUSIC method are overlapped and displayed on the monitor 60 even if the operator is not very skilled. From the display, it is possible to easily identify the position where the radio wave source is highly likely.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. Further, for example, a configuration in which some components are deleted from all the components shown in the embodiment is also conceivable. Furthermore, you may combine suitably the component described in different embodiment.

  As an example, for example, in the above embodiment, the radio wave is first visualized and displayed by the radio holography method, and the operator designates the area. Instead of this, for example, the CPU processing system 50 uses the radio holography. A region where the radio wave source is highly likely to be located is obtained from information obtained by visualizing radio waves by the law, and the location of the radio wave source may be estimated by the MUSIC method for this region.

In the above embodiment, the A / D processing system 30 converts the received signals of the array antennas 11 to 1n input through the high frequency processing system 20 from analog signals to digital signals, respectively. Instead, for example, two or more of the received signals of the array antennas 11 to 1n may be selectively converted from an analog signal to a digital signal.
In addition, it goes without saying that the present invention can be similarly implemented even if various modifications are made without departing from the gist of the present invention.

The circuit block diagram which shows the structure of one Embodiment of the electromagnetic wave monitoring apparatus concerning this invention. 4 is a flowchart for explaining a control operation of a CPU processing system of the radio wave monitoring apparatus shown in FIG. 1.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11-1n ... Array antenna, 20 ... High frequency processing system, 30 ... A / D processing system, 40 ... DSP processing system, 50 ... CPU processing system, 51 ... Memory, 52 ... Hard disk (HDD), 60 ... Monitor, 70 ... Input device, 80... Storage device.

Claims (3)

In radio monitoring equipment that estimates the location of radio sources,
First computing means for performing radio wave measurement by a radio holography method using a received signal of an incoming radio wave;
Based on the measurement results obtained by the first calculation means, area estimation means for obtaining an area where the radio wave source is likely to be located;
A radio wave monitoring apparatus comprising: a second calculation unit that estimates a position of a radio wave source by a MUSIC method using a received signal of an incoming radio wave for an area obtained by the area estimation unit. A display means for visually displaying information;
First display control means for visualizing and displaying the received radio wave on the display means based on the measurement result obtained by the first calculation means;
The radio wave monitoring apparatus according to claim 1 , further comprising second display control means for displaying the position estimated by the second calculation means on the display means. The said 2nd display control means displays the position estimated by the said 2nd calculation means on the said display means so that it may overlap with the display by the said 1st display control means, The display means of Claim 2 characterized by the above-mentioned. Radio monitoring device.

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