JPH08265275A - Method and device for tracking illegal station - Google Patents

Abstract

PURPOSE: To automatically track an illegal station by the parameter of radio waves and to automatically record the data of radio wave emitting time and emitting direction when the illegal station is found. CONSTITUTION: The radio waves are received by an antenna 10 and the parameter of the received radio waves is obtained by parameter detection circuits 20 and 22. A disk 28 stores the parameter of the radio waves from the illegal station obtained beforehand and a collation means 30 compares the parameter of the received radio waves with the stored parameter. When the compared result is coincident, frequency-to-amplitude data and the time at the time of reception are stored in the disk 28 and the audio signals of the radio waves at the time are recorded in a recorder 38. Also when the compared result is non-coincident, the reception of the radio waves and the detection of the parameter are returned and the same processing is repeated. Also, when it is judged that the received radio waves are the radio waves from the illegal station, by using direction finders 44, 46 and 48, the emitting direction of the received radio waves is obtained and the data of the obtained direction are stored as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for obtaining parameters of radio waves emitted from illegal stations in advance and automatically tracking the illegal stations emitting the radio waves.

[0002]

2. Description of the Related Art In order to use radio waves effectively and systematically, it is necessary to use each wireless device under a predetermined condition. However, if you illegally modify the wireless device and use it outside the licensed frequency range, with excessive power, or when it does not meet spurious conditions, other wireless devices such as wireless phones, TVs, radios, etc. The normal operation of equipment may be impaired. Also, even if the wireless device is not illegally modified, if the wireless device can generate radio waves in a frequency outside the licensed frequency range, if it is used outside the licensed frequency range due to illegal operation, similarly, The normal operation of other wireless devices may be impaired. Therefore, in order to crack down on wireless devices that are being illegally operated (hereinafter simply referred to as illegal stations), it is necessary to track the illegal stations.

In the conventional method of tracking an illegal station, an unspecified radio wave is received by an antenna and its output signal is supplied to a spectrum analyzer. The tracker monitored the spectrum (frequency distribution) of the radio wave with a spectrum analyzer and determined that the radio wave having abnormal frequency, spurious, signal level, etc. was emitted from an illegal station. After that, the direction of emission of this radio wave was detected by a plurality of direction detectors to find the position of the illegal station.

[0004]

In the above-mentioned conventional method,
Since it is not known when the illegal station emits radio waves, it was necessary to track the illegal station while monitoring the radio wave with a spectrum analyzer 24 hours a day in order to identify the illegal station.

Therefore, an object of the present invention is to track an electric wave from an illegal station automatically according to its parameter, and when the illegal station is discovered, the electric wave emission time and the emission direction data can be automatically recorded. A method and apparatus are provided.

[0006]

According to the present invention, the receiving means 10 receives a radio wave, and the parameters of the received radio wave are obtained by the parameter detecting means 20 and 22. The accumulating means 28 accumulates the parameters of the radio waves from the illegal stations which are obtained in advance, and the collating means 30 compares the parameters of the received radio waves with the accumulated parameters. When the comparison results match, the time at that time is stored in the storage means 28 and the audio signal of the radio wave at that time is recorded in the recorder means 38. At this time, the data of the frequency versus amplitude waveform of the received radio wave may be stored in the storage means. If the comparison results do not match, the process returns to reception of radio waves and detection of parameters, and the same processing is repeated. Therefore, it is possible to trace an illegal station that emits a radio wave having a parameter obtained in advance. In addition, when it is determined that the received radio wave is from an illegal station, the direction detector is used to determine the emission direction of the received radio wave,
It is also possible to accumulate the data of the obtained direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a functional block diagram of a preferred embodiment of the present invention, and FIG. 2 is a flow chart explaining its operation. In FIG. 1, an antenna 10 as a receiving means is
The electric wave is received, converted into an electric signal, and the electric signal is supplied to the frequency converter 12 and the receiver 36. The frequency converter 12 is a down converter that converts, ie, offsets, the signal frequency of the received radio wave into a predetermined frequency range controlled by the controller (control means) 34. The analog / digital (A / D) converter 14 converts the analog output signal of the frequency converter 12 into a digital value, and supplies the digital value to the n band-pass digital filters (F1 to Fn) 16. Since these digital filters 16 have different pass bands, they are a basic configuration of a digital spectrum analyzer in which the output signal represents the output level of each band (each frequency range). The output signals of the digital filter 16 are supplied to the latch circuit 17 to temporarily latch these signals.

The amplitude parameter detection circuit 20 analyzes the digital signal from the A / D converter 14 and, for example, as shown in FIG.
As shown in, when the radio wave goes from the off state to the on state, that is, when the radio station starts to emit the radio wave, the rise time, the stable amplitude level, the time until the amplitude stabilizes, etc. Then, these are output as time parameter data. The frequency parameter detection circuit 22 receives the plurality of bandpass filters 1 via the latch circuit 18.
When the wireless station starts emitting radio waves as shown in FIG. 4, the frequency transition until the frequency stabilizes and the time until then, spurious, etc. are used as frequency parameter data. Output.

The hard disk 28, which is a storage means,
The parameter data from the amplitude parameter detection circuit 20 and the frequency parameter detection circuit 22 and the time data (date and time data) from the timer 32 are accumulated via the registration (accumulation control) means 26. Collating means 30
Is a circuit for comparing or collating the parameters from the amplitude parameter detecting circuit 20 and the frequency parameter detecting circuit 22 with the parameters stored in the disk 28, and outputs the collating result to the controller 34.

The output signal of the receiver 36 is stored in the recorder 38 as an audio signal, and the speaker 40 produces a sound. The above-described controller 34 controls the frequency conversion of the frequency converter 12 to determine which frequency range of the received radio wave is to be monitored, and the matching means 30.
Tune the receiver 36 to the frequency at which the coincident output is generated, register the unit 26, the disk 28 and the recorder 3.
The operation of No. 8 is controlled by the collation result. In addition, the controller 34
Are connected to direction finders 44, 46 and 48 arranged at different positions, and control the direction finders and receive the result of the direction finding.

The input device 42 such as a keyboard is used to make various settings via the controller 34. Monitor 24
Receives the output signal of the latch 18 and performs a display as a conventional digital spectrum analyzer, and also displays the setting state and the tracking record of the illegal station via the controller 34. The amplitude parameter detection circuit 20, the frequency parameter detection circuit 22, the registration means 26, the matching means 30 and the controller 34 can be configured by a microprocessor system. In this case, the microprocessor system can be composed of a microprocessor, a ROM storing various control programs, a RAM as a working memory, and the like.

Next, the operation of FIG. 1 will be described with reference to the flow chart of FIG. In step 50, the operator sets the frequency range to be monitored via the input device 42 and the controller 34. Based on this setting, the frequency converter 12
Converts the frequency so that the bandpass filter 16 can cover the desired frequency range of the radio wave received by the antenna 10. Therefore, the frequency spectrum that changes from moment to moment due to the normal frequency-amplitude relationship is displayed on the monitor 24.

When the operator finds the radio wave emitted by the illegal station from the display on the monitor 24 or the voice output from the speaker 40, the input device 42 instructs the input device 42 to register the parameter at that time. Then, in step 52,
The controller 34 drives the registration means 26 according to the registration instruction from the input device 42, and stores the parameters from the amplitude parameter detection circuit 20 and the frequency parameter detection circuit 22 in the disk 28. The operator repeats the above-mentioned operation every time the radio wave emitted by the illegal station is discovered. Further, the above operation may be repeated by changing the frequency range.

After registering the parameters of the radio waves from one illegal station, the operator sets the automatic monitoring (tracking) mode from the input device 42 in step 54. At this time, when the frequency range to be tracked is set, the frequency converter 12 also performs frequency conversion according to the setting as described above.
Conventionally, radio waves from illegal stations are only detected for a moment, and the operator must always observe the monitor in order to trace this radio wave in detail and the time when the radio wave is emitted. Please note that this must be done.

Enter the automatic monitoring mode, and first, step 5
At 6, it is determined whether the end of the automatic monitoring (tracking) mode is instructed. If yes, the automatic monitoring mode is ended as it is. In the case of No, the process proceeds to step 58, and the amplitude parameter detection circuit 20 and the frequency parameter detection circuit 22 obtain the parameter from the radio wave that changes with time. In step 60, the matching circuit 30 sequentially matches the parameters from the amplitude parameter detection circuit 20 and the frequency parameter detection circuit 22 with the parameters of the radio waves from the illegal station stored in the disk 28. On this occasion,
The collation may be performed by giving a certain width to the accumulated parameter that is the reference of the illegal office. During this time, timer 3
2 outputs the data of the time at that time, and the direction finder 4
4-48 are tracking the emission direction of each electric wave.

If the collation result of the collating means 30 is coincident, that is, if the result is yes, the process proceeds to step 62. In this step, when the controller 34 receives the coincidence signal from the matching means 30, it controls the disk 28 to store the frequency vs. amplitude waveform and the time data at that time in the disk 28. In order to store the frequency-versus-amplitude waveform in the disk 28, the output data of the latch circuit 18 passes through the frequency parameter detection circuit 22 without being processed, and the controller 3 is operated.
It is supplied to the disk 28 via the registration means 26 which has been placed in the storage control state in 4. Further, the controller 34 determines the reception frequency at that time, sets the detection frequency of the direction detectors 44 to 48 to the reception frequency, and simultaneously stores the direction detection result in the disk 28 via the controller 34. In addition, the controller 34
Sets the tuning frequency of the receiver 36 to the above-mentioned reception frequency, controls the recorder 38, and records the audio output from the receiver 36 for a predetermined period. This is to store the voice of the operator who was operating the illegal station at that time. It should be noted that the recorder 38 simultaneously stores a marker (time data and the like) that associates the storage with the disk 28. When the parameter of the illegal station stored in the disk 28 has a certain width, the amplitude parameter and the frequency parameter from the parameter detection circuits 20 and 22 are also recorded in the disk in order to confirm the deviation at the time of matching. 28 may be stored.

The step 62 is completed or the step 60 is completed.
In the case of No at step 56, the process returns to step 56 and the above-described operation is repeated. Therefore, once the parameters of the radio waves from the illegal station are stored in the disk 28, the apparatus of the present invention automatically keeps track of the illegal station even if the operator is absent.

After the automatic tracking is completed, the operator monitors the accumulated contents of the disk 28 via the input device 42.
, And the recorded contents are reproduced by the speaker 40 on the recorder 38 to confirm the sound at that time. Therefore, the time when the illegal station is operated, its frequency vs. amplitude waveform, audio (contents of call) and the position of the illegal station can be confirmed. On this occasion,
The reference parameter and the actual parameter of the illegal office may be displayed.

Although the preferred embodiment of the present invention has been described above, various modifications and changes can be made without departing from the spirit of the present invention. For example, the storage means may be a semiconductor memory instead of the hard disk 28, and the recorder 38 and the disk 28 may be realized by the same storage means. Further, a signal line for directly supplying the output data (frequency vs. amplitude waveform data) of the latch circuit 18 to the disk 28 may be provided.

[0020]

As described above, according to the present invention, a 24-hour illegal station monitoring system can be realized without an operator.
Further, even if there is a lawful wireless station (lawful station) that uses the same frequency as the illegal station, since the radio wave parameter differs depending on the wireless device, only the illegal station can be tracked. further,
Since the operating time zone and location of the illegal office can be specified, the illegal office can be easily cracked down. Further, since the radio wave parameter can be specified even in the case of non-modulated radio waves, the illegal station can be specified even in the case of unmodulated interference (for example, the operator of the illegal station does not speak).

[Brief description of drawings]

FIG. 1 is a functional block diagram of a preferred embodiment of the present invention.

FIG. 2 is a flow chart illustrating the operation of the present invention.

FIG. 3 is a diagram illustrating amplitude parameters of radio waves.

FIG. 4 is a diagram illustrating frequency parameters of radio waves.

[Explanation of symbols]

 10 receiving means 12 frequency converter 14 A / D converter 16 band pass filter 18 latch 20 amplitude parameter detecting means 22 frequency parameter detecting means 24 monitor 26 registering means 28 accumulating means 30 collating means 32 timer 34 controller 36 receiver 38 Recorder means 40 Speakers 44, 46, 48 Direction finder

Claims (7)

[Claims] 1. A first step of receiving a radio wave and obtaining a parameter of the received radio wave; a second step of comparing a previously obtained radio wave parameter from an illegal station with the received radio wave parameter; And a third step of accumulating the audio signal of the received radio wave and the time at that time when the result of the second step is in agreement, and when the result of the second step is inconsistent, returning to the first step, A method of tracking an illegal station, characterized by tracking an illegal station that emits a radio wave having the parameter obtained in advance. 2. The third step is characterized in that the direction of emission of the received radio wave is obtained by a direction finder, and the obtained direction is also accumulated, and the frequency-amplitude data of the received radio wave is also accumulated. The method of tracking an illegal office according to claim 1. 3. The method according to claim 1, wherein the parameter is at least one of an amplitude parameter and a frequency parameter. 4. A storage unit for storing previously obtained radio wave parameters from an illegal station, a reception unit for receiving radio waves, a parameter detection unit for obtaining the radio wave parameters received by the reception unit, and the parameter detection unit. And a control means for accumulating the time data from the timer in the accumulating means when the collation result of the collating means is coincident with each other. Bureau tracking device. 5. The illegal station tracking device according to claim 4, further comprising recorder means for recording the radio wave received by said receiving means as an audio signal when the matching result of said matching means is a match. 6. The illegal station tracking device according to claim 4, wherein said parameter detecting means, said collating means and said control means are microprocessor systems. 7. The direction detecting means for detecting the emission direction of the radio wave received by the receiving means, further comprising: when the collation result of the collating means is coincident, the accumulating means also detects the result of the direction detecting means. The illegal station tracking device according to claim 4, wherein the illegal station tracking device stores the information.