JP4758674B2 - Simplified radio wave visualization device - Google Patents

Description

  The present invention relates to a simple radio wave visualization device, and more particularly to a simple radio wave visualization device suitable for detecting the direction and position of a source such as an illegal radio wave.

  In order to easily know the source of radio waves, the intensity of the electric field is detected by manually or automatically scanning the space using a directional antenna such as a television receiving antenna. However, with such a method, even when the direction of the radio wave source is known to some extent from the beginning, such as when receiving satellite or terrestrial broadcasts, time-consuming and laborious work is required. When detecting an illegal radio wave whose direction is not known at all, or when the source is a moving body, it requires a lot of time and effort, and when the source is moving, the direction Is very difficult to identify.

A “radio wave azimuth / position detection device” for detecting a radio wave transmission source more efficiently and accurately is disclosed in Patent Document 1. In this known example, an array antenna configured by arranging a plurality of antennas in a linear shape, a circular shape, or the like is provided, thereby detecting the arrival direction of radio waves, and providing imaging means and image processing means to emit radio waves. The configuration is shown in which the presence and shape of an antenna that can be detected is detected, and further, a radio wave receiving antenna and a demodulating means for the received signal are provided to acquire transmitted information. According to this configuration, when a transmittable antenna is detected in the imaging direction and a radio wave transmitting demodulation information is detected from that direction at the same time, it can be determined that the radio wave has been detected. Since this determination process can be performed automatically, it is efficient and accurate.
JP 2003-337163 A

  In the technique described in Patent Document 1 described above, there is no detailed description about the imaging direction of the imaging means, and in an application example to detection of emitted radio waves from a vehicle traveling on a road, the imaging direction is in a direction along the road. It is fixed. For this reason, when a wide angle range on the ground plane is set as a search target, it is not linked to the direction of the radio wave source detected by the array antenna and requires manual handling. The image data acquired by the imaging means is used for antenna detection that can be a radio wave source, but the function to display the direction in which the radio wave is transmitted in correspondence with the scene in the visual field Absent. Furthermore, when the radio wave source is moving over a wide range, it is also desired to track the movement route so that it can be grasped intuitively.

  The purpose of the present invention is to display the direction and position of a radio wave source from which direction and position of a wide range of radio waves to be monitored on the captured image of the area to be monitored. An object of the present invention is to provide a simple radio wave visualization device that can easily grasp radio waves from a radio wave transmission source of a mobile object.

  In order to achieve the above object, the present invention provides a phased array antenna in which antenna elements are two-dimensionally arranged and mounted on a platform, an imaging device mounted on the platform, and the platform Control means for controlling the direction, controlling the angle of view of the imaging apparatus, and controlling the phased array antenna to scan within the angle of view; and the detection position of the received radio wave detected by the phased array antenna And a display means for combining and displaying the image so as to match the position on the image obtained by the imaging device.

  The search direction is determined by pan head control, the field of view of the imaging device and the scanning range of the phased array antenna are controlled to determine the search range, and when a radio wave source is detected within this range, the imaging device acquires the position. By displaying on the image, the position of the radio wave source can be easily recognized intuitively. Furthermore, this radio wave source position detection can be performed automatically and instantaneously, so even if the radio wave source is moving over time, it can be intuitively grasped by displaying it superimposed on the above image. The time at each detection position can also be displayed in an overlapping manner.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a block diagram illustrating an example of the overall configuration of a radio wave simplified visualization apparatus according to the present invention. This apparatus includes a phased array antenna PAA, an antenna beam control unit ABC, a level detector LDT, an A / D conversion unit ADC, an image generation unit IMG, a scanning timing control unit TMC, an overall control unit CNT, a video synthesis unit V1G, and a video display. Image display device VCM, imaging device control unit VCC, video capture unit CAP, alarm unit ALM, panning control unit PNC, pan head TPH, and a video display unit that captures images captured by imaging device VCM It is displayed on the DSP, and the position of the radio wave source detected by the phased array antenna PAA can be displayed on the display screen.

  FIG. 2 is a block diagram showing detailed configurations of the overall control unit CNT and the scanning timing control unit TMC. The overall control unit CNT is an MPU, a main memory, an I / O control unit, which generates and outputs a control signal C to each unit of the apparatus by performing an operation panel on which an operator performs operation input and the processing corresponding to the operation input. It has a bus interface and a calendar clock. The control signal C includes data D, an address A, a write signal WR, and a read signal RD. The data D is written to or read from the unit designated by the address signal A according to the write / read signal. Data to be written to each unit is a signal for controlling the operation of the unit, and data to be read is information representing the operation state of the unit.

  The operation timing control unit TMC includes a video scanning signal generation unit VSSG, an antenna scanning signal generation unit ASSG, and a timing control register TMCREG. The video scanning signal generation unit VSSG generates a video scanning signal VS for scanning the imaging device VCM. The scanning signal VS includes a horizontal synchronizing signal HSYNC, a vertical synchronizing signal VSYNC, and a horizontal clock HCK. The antenna scanning signal generator ASSG generates an antenna scanning signal, that is, an antenna horizontal synchronizing signal AHS, an antenna vertical synchronizing signal AVS, and an antenna scanning clock ASCK by referring to the scanning timing set in the timing control register TMCREG from the overall controller CNT. However, this scanning timing is synchronized with the video scanning signal VS in order to simplify the system configuration.

  Even if the resolution of the antenna beam scanning is lower than the resolution of the imaging device, there is no problem in operation. This is because it is necessary to display the radio wave source with a certain size in order to increase the visibility of the display. For example, when the pixel resolution in the horizontal / vertical direction of the imaging apparatus is 640/480, there is no problem in operation even if the resolution of the antenna beam is about 64/48.

  FIG. 3 shows details of the phased array antenna PAA of FIG. 1 and the antenna beam control unit ABC which is a control unit thereof. The phased array antenna PAA includes n + 1 antenna units AU0 to AU0 arranged two-dimensionally. Each of these antenna units AUj (j = 0 to n) includes an antenna element AAEj and a phase shifter APSj. The outputs of the antenna units are combined and guided to the level detector LDT as a received signal R. The phase shifter APSj in each antenna unit is controlled in phase shift amount by the selection signal PCSj, the write signal PWR, and the phase shift data PDO to PD3 generated by the antenna beam control unit ABC. The phase shift amount is switched according to the beam scanning timing. In this example, the number of bits of the phase shift data is 4 bits, but this may be a bit length corresponding to the display accuracy.

  In the antenna beam control unit ABC, the horizontal and vertical beam scanning angles set in the scanning angle register ASAR by the overall control unit CNT are converted into phase shift data PDO˜ for each antenna unit by a scanning angle / phase shift amount converter PSNV. It converts into PD3 and outputs it to each phase shifter of phased array antenna PAA. The phase shift data rewrite timing is determined by the phase shift data write timing generation unit PSWTG. This timing is synchronized with the antenna scanning signal AS synchronized with the video scanning signal VS of the imaging device.

  FIG. 4 shows details of the level detector LTD and the A / D converter ABC of FIG. In the level detector LDT, the received signal R of the phased array antenna PAA is amplified by the RF amplifier LNA, frequency-converted by the frequency converter FCV, a signal in a predetermined band is taken out by the variable band filter VBPF, and detected by the detector DET To do. The level signal LA detected by the detector DET is guided to the A / D converter ADC. The passband of the variable band filter VBPF is changed by the filter frequency switching circuit FFCHG. The change timing of the pass frequency band needs to be synchronized with the antenna beam scanning, and the frequency switching circuit FFCHG sets the antenna scanning signal AS (AHS, AVS, ASCK) and the filter control register VBPFC from the overall control unit CNT. The band of the variable band filter VBPF is controlled with reference to the set contents.

  In the A / D converter ADC, the level detector LDT output LA is digitally converted by the A / D converter ANTADC and sent as level data LD to the image generator IMG via the bus interface ADBIF. This transmission control is performed by a read control signal RC from the image generation unit IMG. The A / D conversion timing is determined by the conversion timing generation unit ADTG in synchronization with the antenna scanning signal AS.

  FIG. 5 shows details of the imaging device VCM and its control device VCC in FIG. 1, and the imaging device VCM is a video camera having a lens ZMLNZ capable of zooming and autofocusing. The zoom is driven by a zoom ring drive motor ZMDVM, and this motor ZMDVM is driven by a zoom drive circuit ZMDRV.

  Incident light to the lens ZMLNZ is guided to the imaging unit VUNIT, but passes through the half mirror HFMR. A part of incident light is guided to the AF sensor AFSNS by the half mirror HFMR, and the AF control circuit AFCNT drives the AF drive motor AFDVM with reference to the output of the AF sensor AFSNS to perform autofocus control.

  The imaging unit VUNIT is configured using a commonly used CCD image sensor or the like. Since such units are widely available on the market, detailed description thereof is omitted here. The image signal GA obtained by the imaging unit VUNIT is an analog color signal of RED, GREEN, and BLUE, but these may be luminance and color difference signals, or only luminance signals. The analog image signal GA is sent to the video capture unit CAP. The zoom control is performed by controlling the zoom drive circuit ZMDRV via the view angle / zoom amount converter ZMCNV and the zoom drive control ZMDCNT.

  The image pickup device control unit VCC controls the operation of the image pickup device VCCM such as zoom, exposure, and white balance. Control information for that purpose is controlled by the control signal C from the overall control unit CNT and the angle of view control / status register PACSR and image pickup. Set in control / status register VCSR. The imaging device control unit VCCNT refers to the information set in these registers and controls the exposure and white balance of the imaging unit VYUNIT.

  FIG. 6 shows a detailed configuration of the video capture unit CAP of FIG. The analog image GA sent from the imaging device VCM is digitized by the image A / D converter VADC and stored in the image data buffer VBUFF. The image A / D conversion control circuit VADCC generates an A / D conversion clock VADCK synchronized with the video scanning signal VS, and controls operations of the image A / D converter VADC and the data buffer VBUFF. The image data stored in the image data buffer VBUFF is read by the monochrome converter MNCRM to generate luminance data WBSIG, and is sent to the video composition unit VIG as the video signal VDS via the image data transfer interface VTIF. The video signal VDS may be a color signal that is not subjected to monochrome conversion, or may be a multi-tone signal of a specific color after monochrome conversion. The video signal transfer control is performed by the signal VDC from the synthesis unit VIG. The capture comprehensive control unit CAPCNT controls operation / stop of each unit based on information set in the capture control state register CAPCSR by the overall control unit CNT.

  FIG. 7 shows details of the image generation unit IMR and the video synthesis unit VIG of FIG. The level data LD output from the A / D converter ADC is taken into the dual port RAM IMDDPRAM in the image generation unit IMG. By using the dual port RAM, the video synthesis unit VIG can operate without being influenced by the timing of A / D conversion or the like. The write control to the dual port RAM1MGDPRAM is performed by referring to information set by the write address / control signal generation unit DPWRCNT in the image generation information register IMGREG from the overall control unit CNT, and sending the read control signal RC to the A / D conversion unit ADC. Done by sending. The read control from the dual port RAM is performed by the read address / control signal generation unit DPRCNT.

  In the video synthesis unit VIG, the information set in the display / synthesis register DSPREG is referred from the overall control unit CNT, and the layer synthesizer LYRMRG sends the read control signal IC and VDC to the image generation unit IMG and the video capture unit CAP, respectively. Thus, the data ID representing the received power level received by the phased array antenna and the video signal VDS acquired by the imaging device are captured, and the composite image G is generated. The composite image G is given to the video display unit DSP through the display signal generator DSPSG.

  FIG. 8 shows details of the panning control unit PNC and the pan head TPH of FIG. The imaging device VCM and the phased array antenna PAA are attached to the pan head movable portion of the pan head TPH, and the pan head TPH rotates the pan head movable portion in the vertical and horizontal directions by the Y axis motor YDRVMT and the X axis motor XDRVMT. The pan head rotation amount calculation unit TPHCAL in the panning control unit PNC calculates the pan head rotation amount by referring to the information set in the panning control / status register PANREG from the overall control unit CNT, and according to this, the Y-axis motor A drive circuit YTPDRV and an X-axis motor drive circuit XTPDRV drive and control the motors.

  When an alarm occurs, the alarm unit ALM outputs a signal AL from the overall control unit CNT to control the sound generator SG and generate an alarm sound, or controls the lamp driving circuit LMPDRV to turn on a warning lamp.

  The details of each part of the configuration example of the visualization apparatus of the present invention shown in FIG. 1 have been described with reference to FIGS. 2 to 8. Next, the overall operation of this apparatus will be described. When using this apparatus, the operator operates an operation panel provided in the overall control unit CNT to control the direction of the imaging device VCM and the phased array antenna PAA, the angle of view of the imaging device, and the like. For example, by pan head control, the direction of the imaging device and phased array antenna is determined in the direction of the field of view to search for the radio wave source, and zoom control of the imaging device is performed according to the range to be searched, and exposure and white balance are performed. Then, the captured image in the search range is displayed on the video display unit DSP. At this time, the scanning range of the phased array antenna PAA is also matched with the search range of the imaging device. This control of the antenna scanning range may be performed manually or automatically. Further, the frequency band of the variable band filter VBF is set so as to match the frequency band of the detection target radio wave. When the phased array antenna PAA detects any radio wave in this way, the video composition unit VIG generates a composite image by superimposing the detection position on the image of the imaging device and displays it on the video display unit DSP. Since the phased array antenna and the scanning signal of the imaging device are synchronized, it is easy to superimpose the radio wave detection position on the video image at the correct position in the video composition unit VIG. In addition, in order to search the frequency band, if the scanning is performed while switching the frequency or a plurality of times of scanning, and the detected radio wave source is displayed by color for each frequency band, the search result over a wide frequency band can be obtained. It becomes easy to grasp intuitively.

  FIG. 9 is a display example of the image acquired by the imaging apparatus and the radio wave source detected by the phased array antenna, and shows that the radio wave source source is detected at the position indicated by the circle. Thus, according to this apparatus, it can be grasped easily and intuitively from which place in the field of view the radio wave is transmitted. In addition, if the operation is repeated while switching the detection frequency, radio wave transmission sources of a plurality of frequency bands can be displayed superimposed on one image. In order to grasp the detailed position, the zoom amount of the camera platform and the image pickup device is controlled so that the dotted line frame W in the figure has the angle of view, and at the same time, the phased array antenna is operated in this frame. 10 is obtained, and it is possible to grasp in more detail from which side of which building the radio wave is transmitted.

  If the detection method of a radio wave transmission source as shown in FIGS. 9 and 10 is used, detection of illegal radio waves is easy, and the position can be intuitively grasped. As another usage, when the position of a known radio wave source such as a radio base station is known, the radio wave from that position is searched and cannot be detected at a predetermined level. It can be determined that there is some abnormality in the device or the surrounding situation. That is, it can be used for monitoring the operational status of a wireless base station or the like.

  When abnormalities such as illegal radio wave detection and radio base stations are detected in this way, an alarm signal AL is output from the overall control unit CNT by operating the operation panel or automatically operating the built-in means. If the abnormality is notified by blinking the display of the radio wave source source shown in FIGS. 9 and 10 or the like, a more convenient device can be obtained.

  FIG. 11 is a diagram showing still another usage of the apparatus of the present invention. This figure is data of August 11, 2004. As in the case of FIG. 9, the radio wave source S1 is at time 10:00:10, the radio wave source S2 is at time 10:00:20, Furthermore, it shows that the radio wave transmission source S3 was detected at the time 10:00:30. In such a case, the detection time of each radio wave source can be obtained from the calendar clock of the overall control unit CNT and displayed on the screen, so that it can be determined that the radio wave source is moving as shown by the arrows in the figure. Furthermore, the approximate moving speed can be known. Even when moving at a particularly high speed, the apparatus of the present invention can perform automatic detection at a sufficiently high speed, so that it is easy to detect, for example, illegal radio waves being emitted from a running automobile.

It is a block diagram which shows the example of whole structure of the simple visualization apparatus of this invention. It is a figure which shows the detail of the whole control part CNT of FIG. 1, and the scanning timing control part TMC. It is a figure which shows the detail of the phased array antenna PAA and antenna beam control part ABC of FIG. It is a figure which shows the detail of the level detector LDT of FIG. 1, and A / D conversion part ADC. It is a figure which shows the detail of the imaging device VCM of FIG. 1, and the imaging device control part VCC. It is a figure which shows the detail of the video capture part CAP of FIG. It is a figure which shows the detail of the image generation part IMG of FIG. 1, and the video synthetic | combination part VIG. It is a figure which shows the detail of the alarm part ALM of FIG. 1, the panning control part PNC, and the pan head TPH. It is an example of the screen which displayed by superimposing the picked-up image of an imaging device, and the radio wave transmission source which the phased array antenna caught. It is the screen which zoomed up and displayed the frame W of FIG. It is an example of a display screen when a radio wave transmission source is moving.

Explanation of symbols

PAA phased array antenna ABC antenna beam control unit VCC imaging device control unit VCM imaging device LDT level detector ADC A / D conversion unit TMC scanning timing control unit CNT overall control unit CAP video capture unit IMG image generation unit VIG video synthesis unit DSP video Display unit ALM Alarm unit PNC Panning control unit TPH Pan head
source, S1, S2, S3 Radio wave source indication mark

Claims (3)

A phased array antenna in which antenna elements are two-dimensionally arranged and mounted on a platform, an imaging device that is mounted on the platform and images a monitoring target range, and an angle of view of the imaging device and a zoom of the monitoring target range first control means for controlling a second control means for the angle of view by controlling the pan head is the phased array antenna is controlled so as to scan the received wave detected by the phased array antenna the detection position so as to match the position on the image of the monitoring target range obtained by the imaging device, Rutotomoni comprising display means for causing the image and composite display on the display screen, the monitor on the display screen When an angle of view frame is set around the detection position of the received radio wave on the image of the target range, the first control unit performs zoom control of the imaging device so that the angle of view is set. There, thereby, performs a zoom imaging the angle within a monitored range, Telecommunications simple visualization apparatus being characterized in that so as to display combining the detected position of the received radio wave on the display screen by the display means. Furthermore, a monitoring unit is provided, and when the source of the received radio wave is known, the monitoring unit notifies that the source or the surrounding situation is abnormal when the level of the received radio wave cannot be detected at a predetermined level. The simplified radio wave visualization device according to claim 1 to be performed. 3. The simplified radio wave visualization device according to claim 1, further comprising a detection unit that detects a detection time of the received radio wave and displays the detection time in the vicinity of a detection position on the display screen.

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