CN110034831B - Low-complexity frequency spectrum monitoring device and method - Google Patents
Low-complexity frequency spectrum monitoring device and method Download PDFInfo
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- CN110034831B CN110034831B CN201910138912.8A CN201910138912A CN110034831B CN 110034831 B CN110034831 B CN 110034831B CN 201910138912 A CN201910138912 A CN 201910138912A CN 110034831 B CN110034831 B CN 110034831B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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Abstract
The embodiment of the invention provides a low-complexity frequency spectrum monitoring device and a low-complexity frequency spectrum monitoring method, which comprise a segmented primary frequency mixing module and a signal processing control module, wherein: the segmented first-stage frequency mixing module comprises a segmented gain adjustable amplification filtering unit and a frequency mixer, wherein the segmented gain adjustable amplification filtering unit carries out segmented amplification filtering gain processing on a received radio-frequency signal, and the frequency mixer carries out frequency mixing processing on the radio-frequency signal subjected to the segmented amplification filtering gain processing and a local oscillator signal to obtain an intermediate-frequency signal meeting a preset condition; the signal processing control module is connected with the segmented primary mixing module and used for carrying out global control on the segmented primary mixing module and converting the intermediate frequency signal into an IQ baseband signal to obtain frequency spectrum monitoring data so as to carry out frequency spectrum monitoring on the radio frequency signal. The embodiment of the invention effectively inhibits the interference of stray waves, improves the sensitivity of receiving radio frequency signals and improves the accuracy of frequency spectrum monitoring.
Description
Technical Field
The embodiment of the invention relates to the technical field of spectrum monitoring, in particular to a low-complexity spectrum monitoring device and method.
Background
With the rapid development of communication technology, more and more scenes need to perform spectrum monitoring on wireless signals. In the prior art, a zero intermediate frequency technique or a superheterodyne technique is used for spectrum monitoring.
The frequency spectrum monitoring based on the superheterodyne technology can effectively inhibit image interference, and simultaneously has strong adjacent channel interference and intermodulation interference resistance, but the noise coefficient and the spurious performance are deteriorated due to excessive frequency conversion stages. Due to the wide-open characteristic of the radio frequency front end, the anti-interference performance of received signals is poor based on the zero intermediate frequency type frequency spectrum monitoring.
Therefore, there is a need for a low complexity spectrum monitoring apparatus and method to solve the above problems.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a low-complexity frequency spectrum monitoring device and method.
In a first aspect, an embodiment of the present invention provides a low-complexity spectrum monitoring apparatus, including a segmented primary mixing module and a signal processing control module, where:
the segmented first-stage frequency mixing module comprises a segmented gain adjustable amplification filtering unit and a frequency mixer, wherein the segmented gain adjustable amplification filtering unit carries out segmented amplification filtering gain processing on a received radio-frequency signal, and the frequency mixer carries out frequency mixing processing on the radio-frequency signal subjected to the segmented amplification filtering gain processing and a local oscillator signal to obtain an intermediate-frequency signal meeting a preset condition;
the signal processing control module is connected with the segmented primary mixing module and used for carrying out global control on the segmented primary mixing module and converting the intermediate frequency signal into an IQ baseband signal to obtain frequency spectrum monitoring data so as to carry out frequency spectrum monitoring on the radio frequency signal.
In a second aspect, an embodiment of the present invention provides a spectrum monitoring method based on the low-complexity spectrum monitoring apparatus in the first aspect, including:
carrying out sectional amplification filtering gain processing on the received radio frequency signal to obtain a radio frequency signal subjected to sectional amplification filtering gain processing;
performing frequency mixing processing on the radio frequency signal and the local oscillator signal after the segmented amplification and filtering gain processing to obtain an intermediate frequency signal meeting a preset condition;
and converting the intermediate frequency signal into an IQ baseband signal to obtain frequency spectrum monitoring data so as to perform frequency spectrum monitoring on the radio frequency signal.
According to the low-complexity frequency spectrum monitoring device and method provided by the embodiment of the invention, through carrying out the segmented gain adjustable amplification filtering and frequency mixing processing on the radio frequency signal, when the frequency spectrum monitoring is carried out on the radio frequency signal, the interference of stray waves is effectively inhibited, meanwhile, the sensitivity of receiving the radio frequency signal is improved, and the accuracy of the frequency spectrum monitoring is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a spectrum monitoring apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a segmented gain adjustable amplification filtering unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a segmented primary mixing module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a signal processing control module according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a spectrum monitoring method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a spectrum monitoring apparatus according to an embodiment of the present invention, and as shown in fig. 1, an embodiment of the present invention provides a low-complexity spectrum monitoring apparatus, which includes a segmented first-stage mixing module 101 and a signal processing control module 102, where:
the segmented first-stage mixing module 101 includes a segmented gain adjustable amplification filtering unit 1011 and a mixer 1012, in the embodiment of the present invention, a radio frequency signal in an electromagnetic environment is received through a radio frequency antenna, and the radio frequency antenna is connected to the segmented first-stage mixing module 101. After the segmented first-stage frequency mixing module 101 acquires a radio frequency signal through the radio frequency antenna, the segmented gain adjustable amplification filtering unit 1011 performs segmented amplification filtering gain processing on the received radio frequency signal, that is, performs first-stage frequency conversion on the radio frequency signal. Then, a local oscillator generates a local oscillator signal, and the mixer 1012 performs frequency mixing processing on the radio frequency signal and the local oscillator signal after the gain processing of the segmented amplification and filtering to obtain an intermediate frequency signal meeting a preset condition. In the embodiment of the present invention, the frequency of the intermediate frequency signal obtained by the frequency mixing processing is 4875 MHz. After the intermediate frequency signal is obtained, optionally, a series of gain processing may be performed on the intermediate frequency signal, for example, an attenuation matcher, a band pass filter, an amplifier, and the like may be further provided at an output port of the mixer 1012, the setting manner may be one or more, if the gain device is a plurality of gain devices, each gain device is sequentially connected according to an input end and an output end, and the intermediate frequency signal sent from the output port of the mixer 1012 is subjected to gain processing to obtain a narrowband signal of an intermediate frequency 4875MHz and a bandwidth 40MHz, so that the narrowband signal is sent to the signal processing control module 102 by the first-stage segmented mixing module 101. In the embodiment of the present invention, the spectrum monitoring apparatus is further provided with a power supply module, which is used for providing 12V voltage output to the segmented primary mixing module 101 and the signal processing control module 102.
The signal processing control module 102 is connected to the segmented primary mixing module 101, and is configured to perform global control on the segmented primary mixing module 101, convert the intermediate frequency signal into an IQ baseband signal, obtain spectrum monitoring data, and perform spectrum monitoring on the radio frequency signal.
In the embodiment of the present invention, after receiving the intermediate frequency signal obtained by frequency conversion by the segmented primary mixing module 101, the signal processing control module 102 performs numerical control attenuation, sampling, filtering, demodulation, analysis and monitoring on the intermediate frequency signal, thereby performing spectrum monitoring on the radio frequency signal. Specifically, the signal processing control module 102 demodulates the intermediate frequency signal into an IQ baseband signal, and then performs Fast Fourier Transform (FFT) analysis, digital scanning, vector analysis, and the like on the IQ baseband signal in the digital domain according to the amplitude and phase information of the IQ baseband signal. The signal processing control module 102 displays the spectrum monitoring information and obtains the parameter control instruction in real time through the upper computer, so that the real-time spectrum monitoring of the radio frequency signal is realized. Meanwhile, the signal processing control module 102 provides global gain control for the segmented primary mixing module 101 and completes seamless splicing of signal spectrum information.
For example, according to current spectrum monitoring data, a frequency band of 200 to 370MHz needs to be subjected to spectrum monitoring, and through a manual or automatic operation mode, the signal processing control module 102 selects the frequency band of the segmented gain-adjustable amplification filtering unit 1011, so that the segmented first-stage mixing module 101 performs mixing processing on signals of the frequency band of 200 to 370MHz, so as to perform spectrum monitoring on the signals of the frequency band. In this embodiment of the present invention, the signal processing control module 102 is further provided with a clock management synchronization unit, where the clock management synchronization unit is configured to perform synchronization management on each device in the signal processing control module 102, and the local oscillator of the segmented first-stage mixing module 101 sends the 122.88MHz reference clock to the clock management synchronization unit, so as to synchronize clocks between the modules.
According to the embodiment of the invention, by carrying out the segmented gain adjustable amplification filtering and the frequency mixing processing on the radio frequency signal, when the frequency spectrum monitoring is carried out on the radio frequency signal, the interference of stray waves is effectively inhibited, meanwhile, the sensitivity of receiving the radio frequency signal is improved, and the accuracy of the frequency spectrum monitoring is improved.
On the basis of the above embodiment, the apparatus further includes a wide open antenna for receiving a radio frequency signal, and the wide open antenna is connected to the segmented primary mixing module 101. In the embodiment of the present invention, the wide open antenna receives a wireless electromagnetic signal, i.e., a radio frequency signal, with a frequency band ranging from 30 to 3600MHz, and sends the received radio frequency signal to the segmented primary mixing module 101.
On the basis of the foregoing embodiment, fig. 2 is a schematic structural diagram of a segmented gain adjustable amplification filtering unit provided in an embodiment of the present invention, and as shown in fig. 2, the segmented gain adjustable amplification filtering unit includes a pre-multi-selection one switch 201, an amplifier bank 202, a filter bank 203, an adjustable attenuation bank 204, and a post-multi-selection one switch 205, where:
the front-end one-out-of-multiple switch 201 and the rear-end one-out-of-multiple switch 205 are configured to receive a control instruction of the signal processing control module 102, so as to select a frequency band of the radio frequency signal;
the amplifier group 202 is provided with a plurality of amplifiers for amplifying the segmented radio frequency signals, and an input port of each amplifier is sequentially connected with the pre-multi-selection switch 201;
the filter bank 203 is provided with a plurality of filters for filtering the radio frequency signals after being amplified in sections, and an input port of each filter is correspondingly connected with an output port of each amplifier 202;
the adjustable attenuation group 204 is provided with a plurality of adjustable attenuators for performing power adjustment on the radio frequency signal after the segmented amplification and filtering to obtain a radio frequency signal after the gain processing of the segmented amplification and filtering, so as to allow the mixer 1012 to perform frequency mixing processing, an input port of each adjustable attenuator is correspondingly connected to an output port of each filter, and an output port of each adjustable attenuator is sequentially connected to the post-positioned one-more-select switch 205.
In the embodiment of the present invention, the spectrum monitoring device receives the radio frequency signal with the channel range of 30-3600MHz through the wide open antenna, and the radio frequency signal is sent to the segmented gain adjustable amplification filtering unit 1011 after being preprocessed. In the embodiment of the present invention, the segmented gain adjustable amplification filtering unit 1011 divides the frequency band into 8 segments, where the corresponding frequency bands are: 30-60MHz, 60-110MHz, 110-200MHz, 200-370MHz, 370-650MHz, 650-1150MHz, 1150-2000MHz and 2000-3600 MHz. Accordingly, as shown in fig. 2, the pre-select-many switch 201 and the post-select-many switch 205 are both set as one-of-eight switches, and the number of each device in the amplifier bank 202, the filter bank 203 and the adjustable attenuation bank 204 is 8. After the rf signal is sent to the front-end one-of-eight switch 201, the signal processing control module 102 controls the front-end one-of-eight switch 201, and only turns on the frequency band switch corresponding to the current control instruction, for example, the frequency spectrum monitoring needs to be performed on the 1150-plus-2000 MHz frequency band of the rf signal, at this time, the front-end one-of-eight switch 201 and the rear-end one-of-eight switch 205 turn off the switches of other frequency bands according to the control instruction of the signal processing control module 102, and only turn on the switches corresponding to the 1150-plus-2000 MHz frequency band. Then, the signal of the frequency band is sequentially amplified, filtered and power-adjusted by an amplifier corresponding to the amplifier group 202, a filter corresponding to the filter group 203 and an adjustable attenuator corresponding to the adjustable attenuation group 204, and finally, the signal after the segmented gain processing is obtained by the post-eighth-to-eighth switch 205. It should be noted that, in the embodiment of the present invention, the adjustable attenuation group 204 is controlled by the signal processing control module 102, and the power level of the microwave circuit is adjusted within a certain frequency range without interrupting the circuit, so that the microwave circuit has the characteristics of small size, high precision, stability, reliability, and the like.
According to the embodiment of the invention, the interference of stray waves is effectively inhibited by carrying out the segmented amplification filtering gain processing on the radio frequency signals, the frequency spectrum monitoring is carried out on the segmented radio frequency signals, the monitoring data is more accurate, and the complexity of a frequency spectrum monitoring device is effectively reduced.
On the basis of the above embodiment, the filter of the filter bank 203 is a sub-octave filter.
In the embodiment of the invention, the ratio of the highest cut-off frequency to the lowest cut-off frequency of the sub-octave filter is less than 2, so that the frequency multiplication harmonic spurious component in the radio frequency signal can be effectively filtered, and the interference of spurious waves is further inhibited.
Fig. 3 is a schematic structural diagram of a segmented primary mixing module according to an embodiment of the present invention, as shown in fig. 3, on the basis of the above embodiment, the segmented primary mixing module further includes a digitally controlled attenuator 301, a low noise amplifier 302, and a frequency source 303, where:
the digital control attenuator 301 is configured to receive a control instruction of the signal processing control module 102, and perform level adjustment on the received radio frequency signal according to the control instruction, where an output port of the digital control attenuator 301 is connected to an input port of the low noise amplifier 302;
the low noise amplifier 302 is configured to perform low noise processing on the radio frequency signal after the level adjustment, and an output port of the low noise amplifier 302 is connected to an input port of the segmented gain adjustable amplification filtering unit 1011;
the frequency source 303 is configured to provide a local oscillator signal, and the frequency source 303 is connected to the mixer 1012.
In the embodiment of the present invention, as shown in fig. 3, the wide open antenna 304 is connected to the digitally controlled attenuator 301, and the radio frequency signal is received by the wide open antenna 304 and sent to the digitally controlled attenuator 301. Optionally, a first amplifier 305, a front-mounted alternative switch 306 and a rear-mounted alternative switch 307 are further disposed between the digital controlled attenuator 301 and the low noise amplifier 302. The digital control attenuator 301 dynamically adjusts the rf signal according to the control command of the signal processing control module 102, so as to adjust the rf signal within a suitable level range, thereby avoiding the conditions of signal overload, gain compression, distortion, and the like, and expanding the input dynamic range of the receiver. An output port of the digitally controlled attenuator 301 is connected to an input port of the first Amplifier 305, an output port of the first Amplifier 305 is connected to the pre-alternative switch 306, and Noise generated by each device may cause large interference to radio frequency signals, and it is necessary to reduce the generation of such Noise, so a Low Noise Amplifier 302 (LNA for short) is provided between the pre-alternative switch 306 and the post-alternative switch 307, and a normal mode and a Low Noise mode are selected through the alternative switch. The output port of the low noise amplifier 302 is connected to the input port of the segmented gain adjustable amplification filtering unit 1011 through the post-alternative switch 307. In the embodiment of the present invention, a second amplifier 308 and a first attenuation matcher 309 are further disposed between the output port of the segmented gain adjustable amplification filtering unit 1011 and the input port of the mixer 1012, so as to further improve the sensitivity of the radio frequency signal. It should be noted that the frequency source 303 provides a 30.72MHz clock synchronization reference for the signal processing control module 102 in addition to providing the local oscillation signal and the radio frequency signal after the section gain processing for frequency mixing. As shown in fig. 3, a second attenuation matching unit 310, a band-pass filter 311, and a third amplifier 312 may be sequentially disposed at an output port of the mixer 1012, so as to obtain an intermediate frequency signal with lower interference and higher sensitivity.
The embodiment of the invention carries out level adjustment, amplification, low noise and other preprocessing on the radio frequency signal, and further carries out gain processing on the radio frequency signal subjected to the gain processing of the segmented amplification and filtering, thereby more effectively inhibiting the interference of stray waves and improving the sensitivity of received signals.
Fig. 4 is a schematic structural diagram of a signal processing control module according to an embodiment of the present invention, as shown in fig. 4, based on the above embodiment, the signal processing control module includes an analog-to-digital conversion unit 401, a signal processing unit 402, and an embedded ARM micro-control unit 403, where:
the analog-to-digital conversion unit 401 is configured to perform analog-to-digital conversion on the intermediate frequency signal to obtain the IQ baseband signal, and an input port of the analog-to-digital conversion unit 401 is connected to the segmented first-stage frequency mixing module;
the signal processing unit 402 is configured to analyze and process the IQ baseband signal to obtain spectrum monitoring data, so as to perform spectrum monitoring on the radio frequency signal;
the embedded ARM micro control unit 403 is configured to perform global control on the segmented primary mixing module 101 and the analog-to-digital conversion unit 401, and send the spectrum monitoring data to an upper computer for display.
On the basis of the above embodiment, the apparatus further includes a gigabit ethernet interface, a 3.3V logic interface, a USB3.0 interface, an HDMI interface, and a JTAG interface.
In the embodiment of the present invention, referring to fig. 4, a spectrum monitoring apparatus may be used in different situations by providing multiple types of data interfaces 406. For example, the related data of the spectrum monitoring is programmed through a display or a mobile terminal through an HDMI interface, and a plurality of devices in the device are connected in series through a JTAG interface to test or program each device.
On the basis of the above embodiment, the analog-to-digital conversion unit 401 is constructed by an AD 9371.
In the embodiment of the invention, based on the high bandwidth and high integration of the AD9371, the channel bandwidth of the constructed analog-to-digital conversion unit 401 is 100MHz, the data sampling rate is 122.88MHz, and the sensitivity of the received signal is improved.
On the basis of the above embodiments, the signal processing unit 402 is constructed by an FPGA.
In the embodiment of the present invention, the signal processing unit 402 is constructed by using a high-speed processing chip FPGA K7 series, measures amplitude phase information of the IQ baseband signal, and completes operations such as FFT analysis, digital scanning, and vector analysis on the IQ baseband signal in a digital domain, thereby monitoring spectrum data.
In the embodiment of the present invention, each device in the segmented first-stage mixing module 101 and the signal processing control module 102 is controlled by the embedded ARM micro-control unit 403 in the signal processing control module 102, it should be noted that, in the embodiment of the present invention, as shown in fig. 4, the embedded ARM micro-control unit 403 and the signal processing unit 402 are combined to cooperatively perform signal processing and control. The wide-open antenna 304 is connected with the segmented primary mixing module 101 and receives wireless electromagnetic signals with the frequency band range of 30-3600 MHz. After the wide open antenna 304 sends the radio frequency signal to the segmented primary mixing module 101, the segmented primary mixing module 101 receives a control instruction of the embedded ARM micro control unit 403, and performs segmented filtering, amplification, primary mixing and band-pass filtering on the radio frequency signal to obtain a narrowband signal with an intermediate frequency of 4875MHz and a bandwidth of 40 MHz. The segmented primary mixing module 101 is connected to the analog-to-digital conversion unit 401 in the signal processing control module 102, and sends the narrowband signal to the analog-to-digital conversion unit 401 constructed based on the AD 9371. The analog-to-digital conversion unit 401 converts the narrowband signal into an IQ baseband signal, and sends the IQ baseband signal to the signal processing unit 402 through the embedded ARM micro-control unit 403. The signal processing unit 402 is connected to a Double Data Rate (DDR) synchronous dynamic random access memory 404, and measures amplitude and phase information of an IQ baseband signal by using deep storage and multi-Rate digital signal processing techniques, and completes operations such as FFT analysis, digital scanning, and vector analysis of the IQ baseband signal in a digital domain, so as to implement real-time processing of the signal, and the embedded ARM micro-control unit 403 sends corresponding control instructions to the segmented first-stage mixing module 101 and the analog-to-digital conversion unit 401, respectively, according to the analysis result, to perform global gain control on the entire spectrum monitoring device and complete seamless splicing of signal spectrum information. In addition, the embedded ARM micro-control unit 403 is connected to the host computer through the data interface 406, and displays basic spectrum information in real time and accepts parameter input of a user. In the embodiment of the present invention, a 12V voltage output is provided to the segmented first-stage mixing module 101 and the signal processing control module 102 through the power module 403.
In the embodiment of the present invention, the signal processing control module 102 is further provided with a clock management synchronization unit 405 based on an AD9528 chip, the clock management synchronization unit 405 is respectively connected to the segmented primary frequency mixing module 101, the analog-to-digital conversion unit 401 and the embedded ARM micro control unit 403, and provides 122.88MHz clocks for the analog-to-digital conversion unit 401, the embedded ARM micro control unit 403, the signal processing unit 402 and the double-rate synchronous dynamic random access memory 404, and receives a 30.72MHz reference clock provided by the segmented primary frequency mixing module 101, thereby completing clock management between internal modules and synchronization between devices.
The embodiment of the invention provides a frequency spectrum monitoring device, in an input frequency band range of 30-3600MHz, when a radio frequency signal is input at the maximum power, the suppression degree of harmonic waves and clutter is more than 70dBc, the monitoring sensitivity is less than-124 dBm @1kHz, the frequency band scanning rate is more than 10GHz/s, the interference of stray waves is effectively suppressed, and the design complexity of frequency spectrum monitoring equipment is effectively reduced.
Fig. 5 is a schematic flow chart of a spectrum monitoring method according to an embodiment of the present invention, and as shown in fig. 5, the embodiment of the present invention provides a spectrum monitoring method based on the spectrum monitoring apparatus with low complexity, including:
in the embodiment of the invention, the received radio frequency signal with the channel range of 30-3600MHz is segmented, and then the signal with the frequency range of 60-110MHz is amplified, filtered and gain-processed according to the preset monitoring condition, for example, the information needing to be monitored in the frequency range of 60-110MHz is acquired, so that the segmented radio frequency signal after gain is obtained.
in the embodiment of the invention, after the radio frequency signal is subjected to the gain processing of the segmented amplification and filtering, the radio frequency signal is subjected to frequency mixing processing with the local oscillator signal, so as to obtain an intermediate frequency signal with the frequency of 4875 MHz. Optionally, the intermediate frequency signal is further subjected to gain processing to obtain a narrowband signal with an intermediate frequency of 4875MHz and a bandwidth of 20MHz, so that interference of spurious waves is better suppressed, and the sensitivity of received signals is improved.
In the embodiment of the invention, an intermediate frequency signal with the frequency of 4875MHz is demodulated into an IQ baseband signal, then, according to the amplitude and phase information of the IQ baseband signal, the operations of FFT analysis, digital scanning, vector analysis and the like are performed on the IQ baseband signal in a digital domain, and a radio frequency signal is monitored according to frequency spectrum monitoring data obtained by analysis.
According to the spectrum monitoring method provided by the embodiment of the invention, through the step-gain adjustable amplification filtering and the frequency mixing processing of the radio frequency signal, when the spectrum monitoring is carried out on the radio frequency signal, the interference of stray waves is effectively inhibited, meanwhile, the sensitivity of receiving the radio frequency signal is improved, and the accuracy of the spectrum monitoring is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A low-complexity frequency spectrum monitoring device is characterized by comprising a segmented primary frequency mixing module and a signal processing control module, wherein:
the segmented first-stage frequency mixing module comprises a segmented gain adjustable amplification filtering unit and a frequency mixer, wherein the segmented gain adjustable amplification filtering unit carries out segmented amplification filtering gain processing on a received radio-frequency signal, and the frequency mixer carries out frequency mixing processing on the radio-frequency signal subjected to the segmented amplification filtering gain processing and a local oscillator signal to obtain an intermediate-frequency signal meeting a preset condition;
the signal processing control module is connected with the segmented primary mixing module and is used for carrying out global control on the segmented primary mixing module and converting the intermediate frequency signal into an IQ baseband signal to obtain frequency spectrum monitoring data so as to carry out frequency spectrum monitoring on the radio frequency signal;
wherein, the segmented gain adjustable amplification filtering unit comprises a preposed one-out-of-multiple switch, an amplifier group, a filter group, an adjustable attenuation group and a postposition one-out-of-multiple switch, wherein:
the front-mounted one-out-of-multiple switch and the rear-mounted one-out-of-multiple switch are used for receiving a control instruction of the signal processing control module so as to select the frequency band of the radio frequency signal;
the amplifier group is provided with a plurality of amplifiers for amplifying the segmented radio-frequency signals, and an input port of each amplifier is sequentially connected with the preposed one-of-multiple switch;
the filter bank is provided with a plurality of filters for filtering the radio-frequency signals amplified in sections, and an input port of each filter is correspondingly connected with an output port of each amplifier;
the adjustable attenuation group is provided with a plurality of adjustable attenuators and is used for adjusting the power of the radio-frequency signals subjected to the segmented amplification and filtering to obtain the radio-frequency signals subjected to the segmented amplification and filtering gain processing so as to be used for the frequency mixing processing of the frequency mixer, the input port of each adjustable attenuator is correspondingly connected with the output port of each filter, and the output port of each adjustable attenuator is sequentially connected with the postposition one-more switch.
2. The apparatus of claim 1, wherein the filters of the filter bank are sub-octave filters.
3. The apparatus of claim 1, wherein the segmented first-stage mixing module further comprises a digitally controlled attenuator, a low noise amplifier, and a frequency source, wherein:
the digital control attenuator is used for receiving a control instruction of the signal processing control module and adjusting the level of the received radio frequency signal according to the control instruction, and an output port of the digital control attenuator is connected with an input port of the low noise amplifier;
the low-noise amplifier is used for performing low-noise processing on the radio-frequency signal after the level adjustment, and an output port of the low-noise amplifier is connected with an input port of the segmented gain adjustable amplification filtering unit;
the frequency source is used for providing local oscillation signals and is connected with the frequency mixer.
4. The apparatus of claim 1, further comprising a wide open antenna for receiving radio frequency signals, the wide open antenna being connected to the segmented primary mixing module.
5. The apparatus of claim 1, wherein the signal processing control module comprises an analog-to-digital conversion unit, a signal processing unit, and an embedded ARM micro-control unit, wherein:
the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the intermediate frequency signal to obtain the IQ baseband signal, and an input port of the analog-to-digital conversion unit is connected with the segmented first-stage frequency mixing module;
the signal processing unit is used for analyzing and processing the IQ baseband signal to obtain frequency spectrum monitoring data so as to perform frequency spectrum monitoring on the radio frequency signal;
the embedded ARM micro control unit is used for carrying out overall control on the segmented primary frequency mixing module and the analog-to-digital conversion unit and sending the frequency spectrum monitoring data to an upper computer for displaying.
6. The apparatus of claim 1, further comprising a gigabit ethernet interface, a 3.3V logic interface, a USB3.0 interface, an HDMI interface, and a JTAG interface.
7. The apparatus of claim 5, wherein the analog-to-digital conversion unit is constructed by AD 9371.
8. The apparatus of claim 5, wherein the signal processing unit is constructed by an FPGA.
9. A spectrum monitoring method based on the low-complexity spectrum monitoring device of any one of claims 1 to 8, comprising:
carrying out sectional amplification filtering gain processing on the received radio frequency signal to obtain a radio frequency signal subjected to sectional amplification filtering gain processing;
performing frequency mixing processing on the radio frequency signal and the local oscillator signal after the segmented amplification and filtering gain processing to obtain an intermediate frequency signal meeting a preset condition;
and converting the intermediate frequency signal into an IQ baseband signal to obtain frequency spectrum monitoring data so as to perform frequency spectrum monitoring on the radio frequency signal.
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| CN201910138912.8A CN110034831B (en) | 2019-02-25 | 2019-02-25 | Low-complexity frequency spectrum monitoring device and method |
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| CN112653528A (en) * | 2020-12-30 | 2021-04-13 | 天津恒达文博科技股份有限公司 | Monitoring terminal and monitoring method for preference spectrum characteristics of electronic equipment used by audience |
| CN113589037A (en) * | 2021-09-11 | 2021-11-02 | 北京芯同汇科技有限公司 | Frequency spectrum detection device and detection method |
| CN114646566A (en) * | 2022-03-15 | 2022-06-21 | 河北工业大学 | Parallel undisturbed rapid determination method for soil-water characteristic curve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7756487B2 (en) * | 2006-08-29 | 2010-07-13 | Texas Instruments Incorporated | Local oscillator with non-harmonic ratio between oscillator and RF frequencies using pulse generation and selection |
| CN108092682A (en) * | 2017-12-27 | 2018-05-29 | 中国电子科技集团公司第三十六研究所 | A kind of HFDL signals receiving and processing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6807406B1 (en) * | 2000-10-17 | 2004-10-19 | Rf Micro Devices, Inc. | Variable gain mixer circuit |
| DE602004004503D1 (en) * | 2004-04-02 | 2007-03-15 | Suisse Electronique Microtech | RF multi-band receiver with device for reducing energy consumption |
| CN203942591U (en) * | 2014-07-14 | 2014-11-12 | 桂林电子科技大学 | A kind of receiver system with cognitive function |
| CN104202101B (en) * | 2014-09-09 | 2016-08-17 | 西安烽火电子科技有限责任公司 | A kind of shortwave/ultrashort wave instant dynamic spectrum detecting system and method |
| CN109379097A (en) * | 2018-12-11 | 2019-02-22 | 上海精密计量测试研究所 | The Digital Extraction method and device of base band quadrature I/Q data based on zero intermediate frequency |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7756487B2 (en) * | 2006-08-29 | 2010-07-13 | Texas Instruments Incorporated | Local oscillator with non-harmonic ratio between oscillator and RF frequencies using pulse generation and selection |
| CN108092682A (en) * | 2017-12-27 | 2018-05-29 | 中国电子科技集团公司第三十六研究所 | A kind of HFDL signals receiving and processing device |
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