KR100857859B1 - Apparatus and method for detecting an wideband radio frequency - Google Patents

Abstract

The present invention relates to a wideband radio frequency detection apparatus and method, and more particularly, to divide a wide range of specific frequency bands into a plurality of bands, and to convert a radio frequency signal for each band into an intermediate frequency signal using one phase locked loop. The present invention relates to a wideband radio frequency detection apparatus and method capable of demodulating a video signal or an audio signal using only one demodulation circuit by converting and selectively switching a plurality of converted intermediate frequency signals. According to the present invention, by dividing a wideband frequency into a plurality of bands and simultaneously searching each band at a desired frequency interval, by controlling the signal conversion of each divided frequency band using a single phase locked loop, The configuration can be simplified and a more economical and compact frequency detection device can be constructed.

Radio Frequency, Detection, Wideband, Phase Locked Loop, Receiver, Demodulation, FM, AM

Description

Broadband radio frequency detection device and method {APPARATUS AND METHOD FOR DETECTING AN WIDEBAND RADIO FREQUENCY}

1 is a view showing an example of a conventional general RF receiving circuit.

2 is a block diagram illustrating an internal configuration of a broadband radio frequency detection apparatus according to an embodiment of the present invention.

3 is a block diagram for explaining a more detailed internal configuration of the broadband radio frequency detection apparatus according to an embodiment of the present invention.

4 is a diagram illustrating an example of a circuit diagram of a wideband radio frequency detection device according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating the configuration of a mixer for each frequency band in a circuit diagram of a wideband radio frequency detection device according to an embodiment of the present invention.

6 is a flowchart illustrating a wideband radio frequency detection method according to the present invention.

<Explanation of symbols for the main parts of the drawings>

201: signal receiving unit

202: signal conversion unit

203: signal selector

204: demodulator

The present invention relates to a wideband radio frequency detection apparatus and method, and more particularly, to divide a wide range of specific frequency bands into a plurality of bands, and to convert a radio frequency signal for each band into an intermediate frequency signal using one phase locked loop. The present invention relates to a wideband radio frequency detection apparatus and method capable of demodulating a video signal or an audio signal using only one demodulation circuit by converting and selectively switching a plurality of converted intermediate frequency signals.

As illegal radio wave transmitting and receiving devices, such as a wiretap device and a camera, have been miniaturized and widely used in recent years, there have been an increasing number of cases where a wiretap device or a camera is secretly used for various crimes. For example, there are risks of eavesdropping or sneak cameras throughout society, from highly competitive industries such as bidding, to cash machines at financial institutions, to development teams or research institutes for projects or new developments, to corporate executive offices and to personal privacy. have. Although the importance of security is being recognized by some large corporations, financial institutions, research institutes, politicians, and venture companies, various measures to prevent eavesdropping have been proposed. However, due to the lack of security awareness and the absence of an effective eavesdropping prevention system, Many companies or individuals suffer significant material and mental damage from sensitive information leakage or privacy violations.

These illegal radio transceivers have been able to use high frequency bands due to the advancement of technology and a drop in component prices, which means that the antenna can be miniaturized and it is easy to secure a frequency band that is not frequently used. Therefore, the equipment for detecting such a radio wave transmission and reception apparatus must also be advanced, and the detection range must be further increased. However, the conventional detection device for detecting the frequency of the broadband has a problem that the circuit configuration is too complicated and bulky and expensive, so that an efficient frequency detection device capable of detecting and demodulating the broadband frequency with a simple circuit configuration Is urgently needed. In addition, commercially available small wireless cameras can be used as hidden cameras, and most of these small wireless cameras adopt a frequency band and a modulation method to easily configure a receiver. The frequency bands and modulation methods that can be easily configured are the TV broadcasting frequency band, the FM radio broadcasting frequency band, the 1200MHz band, the 2400MHz band, and the 5800MHz band that can be used without permission. AM video and FM audio can be sent at the same time. In the band that can be used without permission, most of them use FM video. Therefore, in order to detect illegal eavesdropping and sneak camera, the demodulation method in this frequency band is appropriately detected by the detection device. The circuit should be configured to cope with it.

Therefore, the present invention divides a wide range of specific frequency bands into a plurality of bands, moves a detection frequency at a desired interval by using one phase locked loop, simultaneously detects a plurality of bands, and converts them into intermediate frequency signals required for voice or video demodulation. A new technique for a broadband radio frequency detection device and method for converting and then outputting a demodulated signal by switching a signal is proposed.

The present invention has been made to improve the prior art as described above, and its object is to divide the wideband frequency into a plurality of bands and simultaneously search each band at a desired frequency interval.

Another object of the present invention is to configure a more economical and miniaturized frequency detection device by controlling signal conversion for a plurality of frequency bands using one phase locked loop.

Still another object of the present invention is to enable efficient demodulation with one demodulation circuit by selectively switching a video signal of a plurality of divided bands using a predetermined switch.

Still another object of the present invention is to further increase reception sensitivity for the low frequency band by separately configuring a plurality of antennas capable of selectively switching according to a desired frequency with respect to the low frequency band.

It is still another object of the present invention to enable FM voice demodulation as well as AM voice demodulation using received signal strength (RSSI) in a frequency detection device.

In order to achieve the above object and solve the above-mentioned problems of the prior art, the broadband radio frequency detection apparatus according to an embodiment of the present invention is a signal receiving unit for receiving a plurality of radio frequency signals for each of a plurality of radio frequency bands A signal converter for converting the plurality of radio frequency signals into a plurality of intermediate frequency signals having a predetermined intermediate frequency, a signal selector for selectively switching the converted plurality of intermediate frequency signals, and the switched intermediate frequency And a demodulator for performing image demodulation or audio demodulation from the signal.

In addition, the broadband radio frequency detection method according to an embodiment of the present invention comprises the steps of receiving a plurality of radio frequency signals for each of a plurality of radio frequency bands, a plurality of intermediate having a predetermined intermediate frequency of the plurality of radio frequency signals And converting each of the converted plurality of intermediate frequency signals into a frequency signal, and performing image demodulation or audio demodulation from the switched intermediate frequency signals.

Hereinafter, an apparatus and method for detecting a broadband radio frequency will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an example of a general radio frequency (RF) receiving circuit. As shown in the figure, a typical radio frequency reception circuit includes an antenna 101, a band select filter 102, a low noise amplifier 103, a mixer 104, a local oscillator 105, a phase locked loop 106, a channel. A selection filter 107, and a demodulator 108.

Hereinafter, referring to the role of each component, the antenna 101 serves to receive the RF signal in the air and convert it into an electrical signal on the wire. The band select filter 102 performs band pass filtering to amplify only the desired frequency band of the signal received from the antenna 101. When the same antenna is used, a duplexer is used to select the band select filter 102. Can play the role of. In addition, the low noise amplifier 103 (LNA) limits the noise mixed in the received signal and amplifies the RF signal, and the low noise amplified RF signal is passed through the mixer 104 (Mixer). Frequency downconversion to the Intermediate Frequency band.

The local oscillator 105 (LO) supplies the mixer 104 with a specific frequency (LO frequency) for frequency synthesis, and in case of communication requiring channel selection, the channel may be changed by changing the specific frequency. have. Phase locked loop 106 (PLL) locks the LO frequency so that it can be locked at a constant frequency. The phase locked loop (PLL) of the voltage regulated oscillator (VCO) It performs a type of frequency tuning that fine-tunes the voltage to move and lock the LO frequency to the desired frequency. In addition, the channel selection filter 107 selects only the desired channel by band pass filtering among the signals converted into the IF band through the mixer 104.

In the demodulator 108, similar to the operation of the low noise amplifier 103, mixer 104, and local oscillator 105, the IF signal is amplified and mixed to convert to a baseband signal and demodulated to a desired voice or video. It plays a role.

2 is a block diagram illustrating an internal configuration of a broadband radio frequency detection apparatus according to an embodiment of the present invention. As shown in the figure, the broadband radio frequency detection apparatus according to the present invention includes a signal receiver 201, a signal converter 202, a signal selector 203, and a demodulator 204.

The signal receiver 201 receives a plurality of radio frequency signals for each of the plurality of radio frequency bands. In addition, the signal receiver 201 performs a preprocessing operation of extracting only a signal having a desired frequency through a predetermined filtering and amplifying process of the received radio frequency signal.

The signal converter 202 converts a plurality of radio frequency signals into a plurality of intermediate frequency signals, respectively. That is, the signal converter 202 down converts the radio frequency signals for each of the plurality of radio frequency bands into intermediate frequency signals. The intermediate frequency is different depending on the signal to be demodulated. For example, in the case of FM image demodulation, the intermediate frequency is 480 MHz, and the AM frequency is 479.25 MHz. In order to down-convert to the intermediate frequency signal, the signal converter 202 performs a process of mixing a specific frequency signal with a radio frequency signal. Here, the specific frequency signal mixed with the radio frequency signal has a different frequency according to each frequency band, and can be adjusted using a phase locked loop or a multiplier.

The signal selector 203 selectively switches the converted plurality of intermediate frequency signals. That is, the signal selector 203 selectively switches a signal for demodulation among the intermediate frequency signals converted for each of a plurality of frequency bands by using a predetermined switch.

The demodulator 204 performs image demodulation or audio demodulation from the intermediate frequency signal selected by the signal selector 203. Specifically, the demodulator 204 converts the selected intermediate frequency signal back to a baseband signal to demodulate and output a video or audio signal using various conventional demodulation schemes.

The demodulator 204 according to the present invention is characterized by performing FM image demodulation or AM image demodulation. That is, when the FM video demodulation is basically performed and a separate AM video demodulation tuner is connected, the expandability of the frequency detection apparatus can be further improved by providing an output terminal for outputting a required demodulation signal.

In addition, the demodulator 204 may perform AM voice demodulation using the received signal strength RSSI. In other words, the demodulator 204 demodulates the intermediate frequency signal and outputs it as an audio signal, and converts the received signal strength into a DC voltage and outputs it. In general, the received signal strength indicates the strength of the received signal, and may output the amplitude modulated waveform as it is. Therefore, the received signal strength can be converted to a value proportional to the strength and weakness through an analog-digital converter (ADC), and the voice can be output through the speaker.

3 is a block diagram for explaining a more detailed internal configuration of the broadband radio frequency detection apparatus according to an embodiment of the present invention.

According to the present invention, the specific frequency band to be detected is divided into the first frequency band, the second frequency band, and the third frequency band in ascending order according to the frequency magnitude. As shown in the drawing, the signal receiver 201 And a first antenna unit 301, a second antenna unit 302, and a third antenna unit 303 for receiving radio frequency signals corresponding to the respective frequency bands.

In addition, the signal converter 202 may include a phase fixing unit 307 for generating a predetermined first mixed signal having a different frequency according to radio frequency signals for each frequency band, the first frequency band, the second frequency band, And a first signal converter 304, a second signal converter 305, and a third signal converter for generating an intermediate frequency signal from the radio frequency signal and the first mixed signal for each of the third frequency bands. 306).

The first signal converter 304 includes an auxiliary phase fixing unit for generating a predetermined second mixed signal, and the first signal converter 304 includes the first mixed signal, the second mixed signal, and the wireless signal. The frequency signal is mixed to generate the intermediate frequency signal. The frequency of the second mixed signal is a frequency difference between the first frequency band and the second frequency band, and the frequency of the first mixed signal is the frequency of the radio frequency signal, the frequency of the intermediate frequency signal, and the It may be determined as the sum of the frequencies of the second mixed signals.

The second signal converter 305 mixes the first mixed signal and the radio frequency signal to generate the intermediate frequency signal, and the frequency of the first mixed signal is determined as the sum of the radio frequency and the intermediate frequency. Can be.

The third signal converter 306 mixes the third mixed signal obtained by multiplying the first mixed signal by a predetermined ratio and the radio frequency signal to generate the intermediate frequency signal. The predetermined ratio may be determined as a frequency ratio of the second frequency band and the third frequency band.

The phase locker 307 may convert a radio frequency signal into an intermediate frequency signal by the first signal converter 304, the second signal converter 305, and the third signal converter 306. Generate the first mixed signal having: For example, the phase locker 307 may fix the mixed frequency to a specific frequency according to a radio frequency to be detected by using a phase lock loop that allows a specific signal to be fixed at a constant frequency.

More detailed operation of each signal converter will be described later with reference to FIGS. 4 and 5.

4 is a diagram illustrating an example of a circuit diagram of a wideband radio frequency detection device according to an embodiment of the present invention.

As shown in the figure, the broadband radio frequency detection apparatus according to the present invention is a component, the antenna (ANT), the filters (HPF and LPF), the low noise amplifier (LNA), the diplexer (Diplexer), the mixer (Mixer) , A voltage-regulated oscillator (VCO), a phase locked loop (PLL), a demodulator (Demodulator), a switch (VS), and the like, the operation of each component of the conventional radio frequency receiver circuit described above with reference to FIG. Similar to the operations of the component.

In the exemplary embodiment of the figure, the frequency band is divided into three bands, and the first frequency band is divided into 1 MHz and more than 1600 MHz, the second frequency band is divided into 1600 MHz and more than 3200 MHz, and the third frequency band is more than 3200 MHz and less than 6400 MHz. . In addition, the first frequency band is subdivided into two bands of 1 MHz or more and less than 300 MHz and 300 MHz and more than 1600 MHz. By lowering the first frequency band, which is a low frequency band, based on 300 MHz, a separate antenna capable of selectively switching can further increase reception sensitivity. In the circuit diagram, four antennas 401, 402, 403, and 404 are configured to receive signals in each divided frequency band.

In this circuit diagram, two phase locked loops, PLL (A) 405 and PLL (B) 406, are used as the phase locked loop for frequency lock, and basically the first frequency band is used as the PLL (A) 405. , The second frequency band, and the third frequency band are controlled simultaneously. Specifically, when detecting a radio frequency (RF) signal in the range of 1600 MHz to 3200 MHz, a PLL (A) 405 is used to detect down-converted to a specific IF signal by using Mixer4. Input the frequency signal plus RF and IF to 'Mixer4'.

In order to detect an RF signal in the range of 1 MHz to 1600 MHz, the PLL (B) 406 first inputs a signal fixed at 1600 MHz to 'Mixer2' to upconvert the RF signal and up-converts the PLL ( A) 405 inputs a frequency signal plus RF, IF, and 1600 MHz as the detection target to 'Mixer3' to down-convert. Here, the first reason for the up-conversion through 'Mixer2' is that the RF signal in the range of 1MHz to 1600MHz is first up-converted by 1600MHz to be treated like the RF signal in the 1600MHz to 3200MHz range, so that 1MHz ~ This is to control signals in the 1600MHz range at the same time.

In addition, to detect an RF signal in the range of 3200 MHz to 6400 MHz, the multiplier 407 is used to multiply the frequency signal generated from the PLL (A) 405 by 2 and input the signal to 'Mixer4'. Convert Here, the reason for 2 multiplication is to allow for simultaneous control of signals in the 3200 MHz to 6400 MHz range through a single phase-locked loop, taking into account 2 multiplications, which are the frequency ratios in the 1600 MHz to 3200 MHz range and the 3200 MHz to 6400 MHz range, The fixed frequency signal multiplied by 2 is input.

In order to configure a circuit detecting a radio wave of 1 MHz to 6400 MHz by a conventional method, a scanning band should be set according to a control range of a phase locked loop, and an independent phase locked loop circuit should be configured for each band. Only a phase locked loop and an auxiliary additional phase locked loop can be used to control multiple frequency bands simultaneously, resulting in a more economical and compact frequency detection device.

As a more specific example according to the present invention, when a signal (first frequency band) of which RF is 400 MHz is to be demodulated to an FM image, it is fixed at 1600 MHz in the PLL (B) 406 and 2480 MHz ((1600) in the PLL (A). +400) +480). In addition, the antenna switch is switched to HI (high) to select the antenna 'ANT3' in the frequency band corresponding to 400 MHz, and in the switch 409 connected to the image demodulator to select the IF signal passing through the 'Mixer3', Switch VS1 'and' VS2 'to LO (low).

As another example, when the FM signal demodulation of the 2400MHz RF signal (second frequency band), the PLL (B) is irrelevant and is fixed to 2880MHz (2400 + 480) in the PLL (A). In addition, since an RF signal of 2400 MHz corresponds to the second frequency band, the antenna switch is irrelevant. In the switch 409 connected to the image demodulator to select the IF signal passing through 'Mixer4', 'VS1' is LO, ' VS2 'switches to HI.

On the other hand, when demodulating the AM image in the frequency detection circuit, the frequency control method is the same as the FM image demodulation except that the IF of the AM image is 479.250 MHz. The AM image signal generated in the same manner as the FM image demodulation may be supplied to a separate AM image demodulation RF module (for example, TV tuner) through the AM_IF terminal 410 to output the AM image.

On the other hand, if the frequency detection circuit wants to demodulate the WIDE FM audio, the WIDE FM frequency control method is also the same as the FM video demodulation except that the IF of the WIDE FM audio is 483.750 MHz, which is 4.5 MHz higher than the AM video (479.250 MHz). Do. The WIDE FM frequency signal generated in the same manner as the FM video demodulation is supplied to the AM video demodulation RF module (for example, TV tuner) capable of demodulating a separate WIDE FM audio signal through the AM_IF terminal 410, thereby providing a WIDE signal. FM audio can be output.

The broadband radio frequency detection apparatus according to the present invention may perform AM voice demodulation using received signal strength (RSSI) 411, 412, and 413 when an AM voice detection request is made. For example, when there is an AM voice detection request, the received signal strength is directly input to the ADC of the CPU of the conventional control board, and is processed in the same manner as the FM voice demodulation signal processing through a separate ADC in parallel and inputted to the CPU. In this case, if the ADC sampling rate of the CPU is more than 8kHz may be processed inside the CPU, if the processing speed is insufficient, a separate audio ADC can be used.

Meanwhile, the apparatus for detecting a wideband radio frequency according to the present invention may simultaneously search a plurality of frequency bands while controlling frequency fixing through the PLL according to the basic search method described above, and may selectively detect only a specific frequency if desired. . When the three bands are simultaneously searched, the step of the third frequency band may be set twice by the multiplier to proceed simultaneously with the detection speed. In addition, when the simultaneous search of the three bands is not performed, the range can be specified and the step can be freely selected in the range of 10 KHz to 1000 MHz.

FIG. 5 is a diagram illustrating the configuration of a mixer for each frequency band in a circuit diagram of a wideband radio frequency detection device according to an embodiment of the present invention. The mixer shown in the drawing is a first signal converter 304, a second signal converter 305 for converting the RF signal for each of the first frequency band, second frequency band, and third frequency band according to the present invention into an IF signal , And may be included in each of the third signal converter 306.

Reference numeral 501 denotes two mixers included in the first signal converter 304, reference numeral 502 denotes a mixer included in the second signal converter 305, and reference numeral 503 denotes a third mixer. The mixer and the multiplier included in the signal converter 306.

Reference numeral 502 inserts a first mixed signal having a sum frequency of RF and IF into 'Mixer1' to downconvert the RF signal of the second frequency band into an IF signal. The frequency of the first mixed signal may be fixed using one phase locked loop.

In the reference numeral 501, before down converting the RF signal of the first frequency band to the IF signal, the second mixed signal is inserted through 'Mixer2' to up-convert the RF signal to the frequency of the second frequency band. Therefore, the frequency of the second mixed signal is a frequency difference between the first frequency band and the second frequency band, and can be fixed using a predetermined auxiliary phase locked loop.

In the reference numeral 503, before the down conversion of the RF signal of the third frequency band to the IF signal, a third mixed signal obtained by multiplying the first mixed signal by a predetermined ratio through a multiplier is generated and inserted into 'Mixer4'. Therefore, the third mixed signal has a frequency multiplied by a frequency ratio between the second frequency band and the third frequency band.

6 is a flowchart illustrating a wideband radio frequency detection method according to the present invention.

In step S601, a plurality of radio frequency signals for each of the plurality of radio frequency bands are received. In addition, in this step, a preprocessing operation is performed to extract only a signal having a desired frequency through a predetermined filtering and amplifying process of the received radio frequency signal.

In step S602, the plurality of radio frequency signals received in step S601 are converted into a plurality of intermediate frequency signals having a predetermined intermediate frequency, respectively. That is, in this step, the radio frequency signals for each of the plurality of radio frequency bands are down-converted into intermediate frequency signals. In order to down-convert to the intermediate frequency signal, in this step, a process of mixing a specific frequency signal with a radio frequency signal is performed. Here, the specific frequency signal mixed with the radio frequency signal has a different frequency according to each frequency band, and can be adjusted using a phase locked loop or a multiplier.

For example, the specific frequency band to be detected is divided into first frequency band, second frequency band, and third frequency band in ascending order according to frequency magnitude, and simultaneously converts and demodulates an RF signal into an IF signal for each frequency band. can do.

In step S603, a plurality of intermediate frequency signals converted in step S602 are selectively switched. That is, in this step, a signal desired for demodulation is selectively switched among intermediate frequency signals converted for each of a plurality of frequency bands by using a predetermined switch.

In step S604, video demodulation or audio demodulation is performed from the intermediate frequency signal switched in step S603. Specifically, in this step, the selected intermediate frequency signal is converted back into a baseband signal to demodulate and output a video or audio signal using various conventional demodulation schemes.

In this step, the FM video demodulation, the WIDE FM audio demodulation, or the AM video demodulation is performed. In other words, by providing the output terminal for outputting the necessary demodulation signal while basically performing the FM image and the FM audio demodulation, the scalability of the frequency detection device can be extended when a separate WIDE FM audio demodulation and an AM image demodulation tuner are connected. It can be increased further. In addition, by demodulating the intermediate frequency signal to output a voice signal, and converting the received signal strength into a DC voltage and outputting the same, it is possible to perform AM voice demodulation using the received signal strength RSSI.

So far, the method for detecting the wideband radio frequency according to the present invention has been described, and the details mentioned in the embodiments of FIGS. 1 to 5 may be applied to the present embodiment as it is, and thus the detailed description thereof will be omitted.

The wideband radio frequency detection method according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from such description.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things that are equivalent to or equivalent to the claims as well as the following claims will belong to the scope of the present invention. .

According to the present invention, by dividing a wideband frequency into a plurality of bands, each band can be simultaneously searched at a desired frequency interval.

In addition, according to the present invention, by controlling the signal conversion of a plurality of divided frequency bands by using one phase locked loop, a more economical and miniaturized frequency detection device can be configured.

In addition, according to the present invention, by selectively switching the video signals of a plurality of divided bands by using a predetermined switch, it is possible to efficiently demodulate the images with one demodulation circuit.

In addition, according to the present invention, by separately configuring a plurality of antennas that can be selectively switched according to the desired frequency for the low frequency band, it is possible to further increase the reception antenna sensitivity for the low frequency band.

In addition, according to the present invention, in the frequency detection device, not only FM voice demodulation but also AM voice demodulation using received signal strength (RSSI) is possible.

In addition, according to the present invention, a demodulation device capable of WIDE FM audio demodulation or AM image demodulation can be connected in the frequency detection device.

Claims (15)

The radio frequency band is classified into ascending order according to the frequency size, and includes a first frequency band, a second frequency band, and a third frequency band, and receives a plurality of radio frequency signals through an antenna unit associated with each of the divided frequency bands. A signal receiving unit; A signal converter which converts the plurality of received radio frequency signals into a plurality of intermediate frequency signals having a predetermined intermediate frequency; A signal selector for selectively switching the converted plurality of intermediate frequency signals; And A demodulator for performing image demodulation or audio demodulation from the switched intermediate frequency signal Broadband radio frequency detection device comprising a. delete The method of claim 1, The first frequency band is subdivided into a plurality of sub frequency bands, The antenna unit associated with the first frequency band includes a plurality of antennas for receiving a radio frequency signal in the subdivided sub-frequency band. The method of claim 1, The first frequency band is, 1 MHz or more and less than 1600 MHz, the second frequency band is 1600MHz or more and less than 3200MHz, the third frequency band is a broadband radio frequency detection device characterized in that 3200MHz or more and less than 6400MHz. The method of claim 1, The signal converter, A phase fixing unit configured to generate a first mixed signal having a first mixed frequency according to the plurality of radio frequency signals; A first signal converter configured to generate the intermediate frequency signal from the radio frequency signal and the first mixed signal for the first frequency band; A second signal converter configured to generate the intermediate frequency signal from the radio frequency signal and the first mixed signal for the second frequency band; And A third signal converter configured to generate the intermediate frequency signal from the radio frequency signal and the first mixed signal for the third frequency band Broadband radio frequency detection device comprising a. The method of claim 5, The first signal converter, (1) a second mixed signal having a second mixed frequency is generated by an auxiliary phase fixing unit included therein; (2) mixing the first mixed signal, the second mixed signal, and the radio frequency signal; And generating the intermediate frequency signal. The method of claim 6, The second mixing frequency is, And a frequency difference between the first frequency band and the second frequency band. The method of claim 6, The first mixing frequency is, And a sum of a frequency of the radio frequency signal, an intermediate frequency of the intermediate frequency signal, and a second mixed frequency of the second mixed signal. The method of claim 5, The third signal converter, And a third mixed signal obtained by multiplying the first mixed signal by a predetermined ratio and the radio frequency signal to generate the intermediate frequency signal. The method of claim 9, The predetermined ratio is, And a frequency ratio between the second frequency band and the third frequency band. The method of claim 1, The demodulation unit, Broadband radio frequency detection apparatus characterized by performing FM audio demodulation or FM video demodulation. The method of claim 1, The demodulation unit, WIDE FM audio demodulation or AM video demodulation, characterized in that the broadband radio frequency detection device. The method of claim 1, The demodulation unit, Broadband radio frequency detection apparatus characterized by performing AM speech demodulation using received signal strength (RSSI). The radio frequency band is classified into ascending order according to the frequency size, and includes a first frequency band, a second frequency band, and a third frequency band, and receives a plurality of radio frequency signals through an antenna unit associated with each of the divided frequency bands. Doing; Converting the received plurality of radio frequency signals into a plurality of intermediate frequency signals having a predetermined intermediate frequency, respectively; Selectively switching the converted plurality of intermediate frequency signals; And Performing image demodulation or audio demodulation from the switched intermediate frequency signal; Broadband radio frequency detection method comprising a. A computer-readable recording medium having recorded thereon a program for executing the method of claim 14.

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