CN113810072B - Broadband dual-channel radio monitoring and receiving system and signal detection method - Google Patents
Broadband dual-channel radio monitoring and receiving system and signal detection method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- H04B1/26—Circuits for superheterodyne receivers
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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
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- H—ELECTRICITY
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Abstract
The invention discloses a wide-band dual-channel radio monitoring and receiving system and a signal detecting method, which comprise a wide-band radio frequency front end module, an A/D conversion module, a two-way two-stage DDC module, a FIFO first-in first-out high-speed buffer module, an intermediate frequency processing module, a data storage module and an upper computer which are respectively connected with a short wave antenna and an ultra-short wave antenna. The wide-band radio frequency front-end module comprises a short-wave channel and a channel exceeding the short-wave channel, converts a received radio signal into an intermediate frequency signal with the frequency of 70MHz and the bandwidth of 20MHz, and realizes frequency spectrum display, ITU measurement, recording and playback by an upper computer. The invention adopts the wide-frequency-band radio frequency front-end module, covers the short-wave and ultra-short-wave frequency bands, expands the functions of the equipment, and can simultaneously or respectively monitor, analyze, record and replay the received signals by two independent signal receiving channels, thereby improving the utilization rate and the monitoring accuracy of the equipment.
Description
Technical Field
The invention relates to the technical field of radio signal monitoring, in particular to a broadband dual-channel radio monitoring receiving system and a signal detection method.
Background
Through construction for many years, radio management departments in all provincial regions realize the monitoring and management of radio in key areas of the regions through fixed monitoring stations, small-sized monitoring stations, mobile monitoring stations and mobile monitoring stations, and ensure the radio order of the regions. However, with the application of new technology and the research and development of new devices, the domestic existing monitoring stations can also perform performance improvement and optimization, so that radio monitoring tasks can be completed better.
At present, radio frequency spectrum monitoring receivers used by radio management departments divide the radio frequency spectrum monitoring receivers into a short wave receiver and an ultrashort wave receiver according to wave bands, the short wave receiver performs a short wave monitoring function, the ultrashort wave receiver performs an ultrashort wave monitoring function, the short wave and ultrashort wave frequency band integrated monitoring receiver is lacked, two sets of equipment are needed to be equipped on occasions needing to monitor short waves and ultrashort wave frequency bands simultaneously, and the problems of high cost, large volume and inconvenient use are caused. In addition, the existing receiver adopts a single-channel DDC processing channel, outputs a baseband I, Q data stream, provides the baseband I, Q data stream for monitoring software of an upper computer to perform spectrum display and measurement analysis, and cannot meet the requirements when multiple signals need to be monitored simultaneously. Only one stage of DDC processing is performed, one bandwidth I, Q data stream is output each time, only one spectrogram is displayed during spectrum display, and the signal cannot be visually recognized from the global and the local at the same time during signal analysis.
Disclosure of Invention
The invention aims to provide a wide-band dual-channel radio monitoring and receiving system and a signal detection method, wherein the frequency monitoring range is from 9KHz to 3.6GHz, and short-wave and ultra-short-wave frequency bands are covered; the method has two stages of DDC processing and audio processing, and respectively outputs a broadband I/Q data stream with the bandwidth of 20MHz, a narrowband I/Q data stream with the bandwidth of 20kHz-4MHz and one audio data stream, three spectrograms can be displayed simultaneously during spectrum display, signals can be conveniently analyzed from local and global, flexibility is provided for spectrum display and signal analysis, and monitoring accuracy is improved; the device has two paths of independent signal receiving and processing (intermediate frequency and audio frequency) channels, can monitor, analyze, record and replay radio signals simultaneously or respectively, and improves the utilization rate of the device.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The receiver comprises a short wave antenna, an ultrashort wave antenna and a satellite positioning module, wherein the short wave antenna and the ultrashort wave antenna are connected with a wide-frequency-band radio frequency front end module, the wide-frequency-band radio frequency front end module, an A/D conversion module, a two-way two-stage DDC module, a FIFO first-in first-out cache module and an intermediate frequency processing module are sequentially connected, and the intermediate frequency processing module is connected with a data storage module and the upper computer; the short wave antenna adopts an active short wave receiving antenna with the frequency range of 9KHz-30 MHz; the ultra-short wave antenna adopts a wide-range antenna with the frequency range of 30MHz-3.6 GHz; the wide-band radio frequency front-end module comprises a short-wave channel and a short-wave channel exceeding the short-wave channel, wherein the short-wave channel is connected with a short-wave antenna, and a superheterodyne structure up-conversion technology is adopted to up-convert a radio frequency signal with the frequency range of 9KHz-30MHz into an intermediate frequency signal with the frequency of 70 MHz; the ultra-short wave channel is connected with an ultra-short wave antenna, and a frequency conversion technology of an ultra-heterodyne structure is adopted to convert a radio frequency signal with the frequency range of 30MHz-3.6GHz into an intermediate frequency signal with the frequency of 70MHz through twice down conversion; the radio signals received by the short wave antenna and the ultra-short wave wire are converted into intermediate frequency signals with the frequency of 70MHz and the bandwidth of 20MHz by the wide-band radio frequency front end module, and the intermediate frequency signals are converted by the A/D conversion module and then transmitted to the two-way two-stage DDC module; the two-way two-stage DDC module converts the intermediate frequency signal into a broadband 1/O data stream with the output bandwidth of 20MHz and a narrowband I/O data stream with the output bandwidth of 20KHz-4MHz, and the broadband 1/O data stream is transmitted to the intermediate frequency processing module for processing after passing through the FIFO first-in first-out high-speed cache module; the intermediate frequency processing module further reduces the received I/O data stream rate and performs full-band fast scanning, data splicing, fourier transformation, data demodulation and audio demodulation; and then the processed I/O data stream and the processed audio data stream are transmitted to an upper computer, and the upper computer compares the processed I/O data stream and the processed audio data stream with the stored radio signals to realize spectrum display, ITU measurement, recording and playback.
Preferably, the short wave antenna adopts a small whip-shaped active short wave receiving antenna with a common mode noise choke coil in the frequency range of 9KHz-30 MHz. The broadband radio frequency front-end module comprises a short wave channel and an ultrashort wave channel, the short wave channel and the ultrashort wave channel are switched through a radio frequency switch, the radio frequency switch is connected with a broadband filter, and the broadband filter is connected with a second intermediate frequency amplifier; the bandwidth of the broadband filter is 20MHz; the amplification factors of the second intermediate frequency amplifier are three levels of 15dB, 30dB and 45 dB.
Preferably, the short wave channel adopts a superheterodyne structure up-conversion technology, and comprises a low-pass filter with a bandwidth of 30MHz, a second controllable attenuator, a second preamplifier, a third local oscillator and a mixer which are connected in sequence, and the short wave channel up-converts a radio frequency signal with a frequency of 9kHz-30MHz into an intermediate frequency signal with a frequency of 70 MHz; the attenuation coefficient of the second controllable attenuator is 0-62dB, the step is 1dB, and the second controllable attenuator is controlled by an upper computer; the second preamplifier is 22dB fixed amplification factor; the third local oscillation frequency is 80-100MHz, and an intermediate frequency signal with the frequency of 70MHz is obtained after mixing; the ultra-short wave channel adopts the structural frequency conversion technology of a superheterodyne receiver and comprises a preselector, a first controllable attenuator, a first preamplifier, a first mixer, a first intermediate frequency amplifier and a second mixer which are sequentially connected, wherein a radio frequency signal with the frequency of 30MHz-3.6GHz is converted into an intermediate frequency signal with the frequency of 70MHz through twice frequency conversion; the attenuation coefficient of the first controllable attenuator is 0-62dB, and the first controllable attenuator is controlled by upper computer software to step by 1dB; the first preamplifier is 10dB fixed amplification factor; when the frequency of an input radio frequency signal is 30-1700MHz, the first local oscillation frequency is 2290-3960MHz, a first intermediate frequency signal with the frequency of 2260MHz is obtained after mixing, the second local oscillation frequency is 2330MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after mixing; when the frequency of an input radio frequency signal is 1700-3600MHz, the first local oscillation frequency is 2740-4640MHz, a first intermediate frequency signal with the frequency of 1040MHz is obtained after mixing, the second local oscillation frequency is 1110MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after mixing; the pre-selector is divided into 13 sections, and each section has a frequency range of 30-50MHz、50-80MHz、80-126MHz、126-200MHz、192-323MHz、307-508MHz、492-768MHz、752-1008MHz、992-1328MHz、1312-1748MHz、1732-3398MHz、2382-3108MHz and 3092-3600MHz respectively.
Preferably, the two-way two-stage DDC module comprises a field programmable gate array FPGA chip, the field programmable gate array FPGA chip extracts two independent DDC receiving channels, each channel is provided with two stages of cascaded DDCs, the first stage DDC outputs a broadband I/Q data stream with the bandwidth of 20MHz, and the second stage DDC outputs a narrowband I/Q data stream with the bandwidth of 20kHz-4 MHz.
Preferably, the intermediate frequency processing module comprises a DSP microprocessor, and the DSP microprocessor comprises a noise suppression, demodulation filter, trap, AGC gain control, demodulator, audio gain control, audio filter and control parameter analysis module, so as to further reduce the I/Q data stream rate and complete fourier transform FFT, digital filtering, digital demodulation, audio demodulation and noise suppression.
Preferably, the wide-band radio frequency front end module further comprises a control command analysis module, wherein the control command analysis module is connected with the intermediate frequency processing module and is used for receiving a control command of the intermediate frequency processing module, analyzing and controlling local oscillation frequency, attenuation coefficient of the controllable attenuator, amplification factor of the amplifier and switching control of the short wave channel and the ultra-short wave channel.
Preferably, the intermediate frequency processing module is further connected with a memory, and the memory is used for storing I/O stream data generated after the conversion of the two-way two-stage DDC module.
Preferably, the upper computer has the function of monitoring the receiver, and has the functions of spectrum display, ITU measurement, storage, task management, data demodulation mode and voice demodulation; the spectrum display has three spectrum display areas, and simultaneously displays a broadband real-time spectrum with the frequency of 20MHz, a narrowband spectrum with the frequency of 20kHz-4MHz and an audio real-time spectrum with the bandwidth of 20 kHz-320 kHz, and simultaneously carries out two paths of ITU measurement, recording and playback.
Preferably, the A/D conversion module adopts a high-speed 16-bit 100MSPS conversion module, and supports the input of analog signals with the maximum bandwidth of 50 MHz.
A method for detecting signals in a wide-band two-channel radio monitoring and receiving system, as described above, comprising the steps of:
s1, manufacturing a signal comparison template:
S1.1, inputting regular station information data acquired from a local area radio management department into a regular station database, wherein the information data comprises center frequency, bandwidth, modulation mode, modulation parameters, transmitting power and station position of a regular station; setting parameters of a template, wherein the parameters comprise a frequency band scanning sweep frequency range, a sweep frequency step, a radio frequency attenuation coefficient, an intermediate frequency measurement bandwidth, a resolution bandwidth and a judgment threshold; starting a task of manufacturing a signal comparison template, and starting to manufacture the signal comparison template;
S1.2, acquiring signal comparison module manufacturing time and receiver position through a satellite positioning module; starting the receiver to perform full-band scanning, comparing the signals obtained by scanning with a set judgment threshold, and determining that the signals are higher than a threshold value as effective signals; estimating the frequency value of each effective signal through an upper computer center frequency estimation algorithm, taking the frequency value of the effective signal as the center frequency, taking a preset intermediate frequency bandwidth as a measurement bandwidth, sequentially carrying out intermediate frequency measurement on each effective signal, and automatically measuring the frequency, bandwidth and level value of each effective signal;
S1.3, after the modulation mode of the effective signal is estimated through an upper computer modulation mode estimation algorithm, comparing the effective signal with data in a regular station database established in the S1.1, marking a signal consistent with the regular station and an inconsistent signal, and analyzing the reason of the inconsistent signal; continuously recording the scanned signal data for 1-5 days, and calculating the channel occupancy rate and the time occupancy rate; packaging the setting parameters, the time position information, the original scanning signals, the measurement results, the judgment results, the channel occupancy rate and the time occupancy rate into a signal template, and storing the signal template into a signal comparison template database;
s2, starting the receiver to automatically search illegal signal task
S2.1, selecting a proper signal comparison template, and reading set parameters; acquiring signal comparison template time and receiver position through a satellite positioning module of a receiver, starting full-band scanning of the receiver, comparing signals obtained by scanning with a set judgment threshold, wherein the signals are identified as effective signals which are higher than the threshold, and estimating the frequency value of each effective signal through an upper computer center frequency estimation algorithm; taking the frequency value of the effective signal as the center frequency, taking the preset intermediate frequency bandwidth as the measurement bandwidth, sequentially carrying out intermediate frequency measurement on each effective signal, and automatically measuring the frequency, bandwidth and level value of each effective signal;
S2.2, estimating a modulation mode of an effective signal through an upper computer modulation mode estimation algorithm, sequentially comparing the effective signal with signals in a signal comparison template, marking a signal consistent with the signal comparison template and a signal inconsistent with the signal comparison template, and carrying out voice demodulation and recording on the signal inconsistent with the signal according to an identified modulation mode; outputting a comparison result of inconsistent signals, wherein the result is an abnormal or interference signal automatically detected by a wide-band dual-channel radio monitoring receiving system;
S3, the two-way two-channel radio monitoring and receiving system adopts a two-way two-stage DDC module as a signal channel, and when one signal channel detects abnormal signals, the other signal channel carries out conventional signal monitoring and frequency spectrum display.
Preferably, when the intermediate frequency processing module performs omnibearing scanning, in order to increase the scanning speed, a DSP microprocessor in the intermediate frequency processing module scans and stores the scanning data from the starting frequency to the ending frequency according to the starting frequency and the ending frequency of scanning of the upper computer, the scanning data are spliced each time from the starting frequency to the ending frequency according to the bandwidth of 20MHz each time and the stepping frequency of 20MHz, and the complete full-frequency panoramic scanning data are formed and sent to the upper computer for spectrum display.
Preferably, in the step S2.2, for the obtained signal or frequency hopping signal which overlaps with the frequency of the regular station and is not easy to distinguish, the abnormal signal is analyzed by comparing the channel occupancy rate and the time occupancy rate characteristics with the signal in the signal comparison module after detecting for a certain period of time.
Preferably, the voice demodulation is performed by a DSP microprocessor in the intermediate frequency processing module, the DSP microprocessor selects a corresponding demodulation mode according to the command of the upper computer, and the corresponding audio is transmitted to the upper computer for storage after demodulation is completed.
And S1.2, the upper computer frequency estimation algorithm is that the upper computer obtains the maximum value of the frequency band signal, and the maximum value is determined as the estimated center frequency.
And S1.3, a modulation mode estimation algorithm adopts a threshold value and a modulation recognition method of a decision tree to carry out modulation recognition, the recognition method sets a threshold value for each feature, the input signals are classified into different modulation groups through the threshold value, and a decision flow is used for judging the specific modulation mode of the signals by combining a plurality of features.
The beneficial effects of the invention are as follows:
(1) The invention adopts the wide-band radio frequency front-end module, so that the frequency range of the received radio signal is as low as 9KHz, the short-wave frequency band and the ultra-short-wave frequency band are covered, the functions of the equipment are expanded, and two paths of independent signal receiving and processing channels (intermediate frequency and audio frequency) can simultaneously or respectively monitor, analyze, record and play back the received signals, thereby improving the utilization rate of the equipment. Signals received by each channel are subjected to two-stage DDC (direct digital control) processing and audio processing, and three-stage data streams are simultaneously output, so that flexibility is provided for spectrum display and signal analysis, and monitoring accuracy is improved;
(2) The medium-short wave antenna of the invention adopts the small whip-shaped active antenna with the common mode noise choke coil to greatly reduce the volume of the antenna, so that the medium-short wave antenna is easier to use in mobile equipment and portable equipment; the common mode noise choke coil is used for eliminating common mode noise from the antenna feeder, and greatly improving the quality of received signals;
(3) The A/D conversion module adopts a high-speed 16-bit 100MSPS conversion module, supports the input of analog signals with the maximum bandwidth of 50MHz, and ensures the large dynamic range of short-wave and ultrashort-wave frequency bands by 16-bit conversion bits;
(4) According to the invention, the data stream output by the FIFO first-in first-out cache module and the two-way two-stage DDC module provides cache, so that the real-time processing of multichannel signals is realized;
(5) The DSP microprocessor in the invention combines the FIFO first-in first-out cache module and the memory, so that the scanning speed of full-band rapid scanning can be improved; when a general receiver performs full-band fast scanning, broadband data scanned each time are sent to an upper computer, and data are spliced through the upper computer, so that the speed of completing one full-band scanning is unlikely to be fast under the influence of the uploading times and the transmission mode of receipts; according to the invention, the data are spliced and placed into the DSP microprocessor for processing, and the data are transmitted to the upper computer once after the splicing is completed, so that the scanning speed is greatly improved; meanwhile, the operations such as Fourier transform, data demodulation, audio demodulation and the like are transplanted into the DSP microprocessor for carrying out, so that CPU resources of an upper computer are not occupied, and the processing performance of the system is greatly improved;
(6) The invention has high integration level, wide monitoring range, fine design, high flexibility, higher monitoring and analysis accuracy of signals, provides an effective basic platform for intelligent and automatic monitoring of radio monitoring work, and can be used for fixed stations, mobile stations and mobile platform carriers;
(7) The invention integrates multiple functions of two-way signal simultaneous monitoring, signal rapid searching, signal interception, signal identification, broadband recording, off-line analysis and the like, has the capabilities of reconnaissance discovery of unknown signals, monitoring and alarming of known signals, interception processing of known signals and the like, supports automatic and multiple human interaction working modes, and can be widely applied to frequency spectrum monitoring work of local and army radio management departments.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a block diagram of a wide band rf front-end module in accordance with the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The system comprises a receiver and an upper computer, wherein the receiver comprises a short wave antenna, an ultrashort wave antenna and a satellite positioning module, the short wave antenna and the ultrashort wave antenna are connected with a wide-frequency-band radio frequency front end module, the wide-frequency-band radio frequency front end module, an A/D conversion module, a two-way two-stage DDC module, a FIFO first-in first-out high-speed cache module and an intermediate frequency processing module are sequentially connected, and the intermediate frequency processing module is connected with a data storage module and the upper computer; the short wave antenna adopts an active short wave receiving antenna with the frequency range of 9KHz-30 MHz; the ultra-short wave antenna adopts a wide-range antenna with the frequency range of 30MHz-3.6 GHz; the wide-band radio frequency front-end module comprises a short-wave channel and a short-wave channel exceeding the short-wave channel, wherein the short-wave channel is connected with a short-wave antenna, and a superheterodyne structure up-conversion technology is adopted to up-convert a radio frequency signal with the frequency range of 9KHz-30MHz into an intermediate frequency signal with the frequency of 70 MHz; the ultra-short wave channel is connected with an ultra-short wave antenna, and a frequency conversion technology of an ultra-heterodyne structure is adopted to convert a radio frequency signal with the frequency range of 30MHz-3.6GHz into an intermediate frequency signal with the frequency of 70MHz through frequency conversion twice; the radio signals received by the short wave antenna and the ultra-short wave wire are converted into intermediate frequency signals with the frequency of 70MHz and the bandwidth of 20MHz by the wide-band radio frequency front end module, and the intermediate frequency signals are converted by the A/D conversion module and then transmitted to the two-way two-stage DDC module; the two-way two-stage DDC module converts the intermediate frequency signal into a broadband 1/O data stream with the output bandwidth of 20MHz and a narrowband I/O data stream with the output bandwidth of 20KHz-4MHz, and the broadband 1/O data stream is transmitted to the intermediate frequency processing module for processing after passing through the FIFO first-in first-out high-speed cache module; the intermediate frequency processing module further reduces the received I/O data stream rate and performs full-band fast scanning, data splicing, fourier transformation, data demodulation and audio demodulation; and then the processed I/O data stream and the processed audio data stream are transmitted to an upper computer, and the upper computer compares the processed I/O data stream and the processed audio data stream with the stored radio signals to realize spectrum display, ITU measurement, recording and playback.
The short wave antenna adopts a small whip-shaped active short wave receiving antenna with a common mode noise choke coil in the frequency range of 300KHz-30 MHz.
The wide-band radio frequency front-end module comprises a short-wave channel and an ultrashort-wave channel, the short-wave channel and the ultrashort-wave channel are switched through a radio frequency switch, the radio frequency switch is connected with a broadband filter, and the broadband filter is connected with a second intermediate frequency amplifier; the bandwidth of the broadband filter is 20MHz; the amplification factors of the second intermediate frequency amplifier are three levels of 15dB, 30dB and 45 dB.
The short wave channel adopts a superheterodyne structure up-conversion technology and comprises a low-pass filter with a bandwidth of 30MHz, a second controllable attenuator, a second preamplifier, a third local oscillator and a mixer which are sequentially connected, and the short wave channel up-converts a radio frequency signal with a frequency of 9kHz-30MHz into an intermediate frequency signal with a frequency of 70 MHz; the attenuation coefficient of the second controllable attenuator is 0-62dB, the step is 1dB, and the second controllable attenuator is controlled by an upper computer; the second preamplifier is 22dB fixed amplification factor; the third local oscillation frequency is 80-100MHz, and an intermediate frequency signal with the frequency of 70MHz is obtained after mixing; the ultra-short wave channel adopts a super heterodyne structure frequency conversion technology and comprises a pre-selector, a first controllable attenuator, a first preamplifier, a first mixer, a first intermediate frequency amplifier and a second mixer which are sequentially connected, and a radio frequency signal with the frequency of 30MHz-3.6GHz is converted into an intermediate frequency signal with the frequency of 70MHz through twice down conversion; the attenuation coefficient of the first controllable attenuator is 0-62dB, and the first controllable attenuator is controlled by upper computer software to step by 1dB; the first preamplifier is 10dB fixed amplification factor; when the frequency of an input radio frequency signal is 30-1700MHz, the first local oscillation frequency is 2290-3960MHz, a first intermediate frequency signal with the frequency of 2260MHz is obtained after mixing, the second local oscillation frequency is 2330MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after mixing; when the frequency of an input radio frequency signal is 1700-3600MHz, the first local oscillation frequency is 2740-4640MHz, a first intermediate frequency signal with the frequency of 1040MHz is obtained after mixing, the second local oscillation frequency is 1110MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after mixing; the pre-selector is divided into 13 sections, and each section has a frequency range of 30-50MHz、50-80MHz、80-126MHz、126-200MHz、192-323MHz、307-508MHz、492-768MHz、752-1008MHz、992-1328MHz、1312-1748MHz、1732-3398MHz、2382-3108MHz and 3092-3600MHz respectively.
The A/D conversion module adopts a high-speed 16-bit 100MSPS conversion module and supports the input of analog signals with the maximum bandwidth of 50 MHz.
The two-way two-stage DDC module comprises a field programmable gate array FPGA chip, the field programmable gate array FPGA chip extracts two independent DDC receiving channels, each channel is provided with two stages of cascaded DDCs, the first stage DDC outputs a broadband I/Q data stream with the bandwidth of 20MHz, and the second stage DDC outputs a narrowband I/Q data stream with the bandwidth of 20kHz-4 MHz.
The intermediate frequency processing module comprises a DSP microprocessor, and the DSP microprocessor comprises noise suppression, a demodulation filter, a wave trap, AGC gain control, a demodulator, audio gain control, an audio filter and a control parameter analysis module, so that the I/Q data flow rate is further reduced, and Fourier transform FFT, digital filtering, digital demodulation, audio demodulation and noise suppression are completed.
The wide-band radio frequency front-end module further comprises a control command analysis module, wherein the control command analysis module is connected with the intermediate frequency processing module and used for receiving a control command of the intermediate frequency processing module, analyzing and controlling local oscillation frequency, an attenuation coefficient of the controllable attenuator, amplification factor of the amplifier and switching control of the short wave channel and the ultra-short wave channel.
The intermediate frequency processing module is also connected with a memory, and the memory is used for storing I/O stream data generated after the conversion of the two-way two-stage DDC module.
The upper computer has the functions of monitoring the receiver and has the functions of spectrum display, ITU measurement, storage, task management, data demodulation mode and voice demodulation; the spectrum display has three spectrum display areas, and simultaneously displays a broadband real-time spectrum with the frequency of 20MHz, a narrowband spectrum with the frequency of 20kHz-4MHz and an audio real-time spectrum with the bandwidth of 20 kHz-320 kHz, and simultaneously carries out two paths of ITU measurement, recording and playback.
A method for detecting signals in a wide-band two-channel radio monitoring and receiving system, as described above, comprising the steps of:
s1, manufacturing a signal comparison template:
S1.1, inputting regular station information data acquired from a local area radio management department into a regular station database, wherein the information data comprises center frequency, bandwidth, modulation mode, modulation parameters, transmitting power and station position of a regular station; setting parameters of a template, wherein the parameters comprise a frequency band scanning sweep frequency range, a sweep frequency step, a radio frequency attenuation coefficient, an intermediate frequency measurement bandwidth, a resolution bandwidth and a judgment threshold; starting a task of manufacturing a signal comparison template, and starting to manufacture the signal comparison template;
S1.2, acquiring signal comparison module manufacturing time and receiver position through a satellite positioning module; starting the receiver to perform full-band scanning, comparing the signals obtained by scanning with a set judgment threshold, and determining that the signals are higher than a threshold value as effective signals; estimating the frequency value of each effective signal through an upper computer center frequency estimation algorithm, taking the frequency value of the effective signal as the center frequency, taking a preset intermediate frequency bandwidth as a measurement bandwidth, sequentially carrying out intermediate frequency measurement on each effective signal, and automatically measuring the frequency, bandwidth and level value of each effective signal;
S1.3, estimating a modulation mode of an effective signal through an upper computer modulation mode estimation algorithm, comparing the modulation mode with data in a regular station database established in the S1.1, marking a signal consistent with a regular station and an inconsistent signal, and analyzing the reason of the inconsistent signal; continuously recording the scanned signal data for 1-5 days, and calculating the channel occupancy rate and the time occupancy rate; packaging the setting parameters, the time position information, the original scanning signals, the measurement results, the judgment results, the channel occupancy rate and the time occupancy rate into a signal template, and storing the signal template into a signal comparison template database;
s2, starting the receiver to automatically search illegal signal task
S2.1, selecting a proper signal comparison template, and reading set parameters; acquiring signal comparison template time and receiver position through a satellite positioning module of a receiver, starting full-band scanning of the receiver, comparing signals obtained by scanning with a set judgment threshold, wherein the signals are identified as effective signals which are higher than the threshold, and estimating the frequency value of each effective signal through an upper computer center frequency estimation algorithm; taking the frequency value of the effective signal as the center frequency, taking the preset intermediate frequency bandwidth as the measurement bandwidth, sequentially carrying out intermediate frequency measurement on each effective signal, and automatically measuring the frequency, bandwidth and level value of each effective signal;
S2.2, estimating a modulation mode of an effective signal through an upper computer modulation mode estimation algorithm, sequentially comparing the effective signal with signals in a signal comparison template, marking a signal consistent with the signal comparison template and a signal inconsistent with the signal comparison template, and carrying out voice demodulation and recording on the signal inconsistent with the signal according to an identified modulation mode; outputting a comparison result of inconsistent signals, wherein the result is an abnormal or interference signal automatically detected by a wide-band dual-channel radio monitoring receiving system;
S3, the two-way two-channel radio monitoring and receiving system adopts a two-way two-stage DDC module as a signal channel, and when one signal channel detects abnormal signals, the other signal channel carries out conventional signal monitoring and frequency spectrum display.
When the intermediate frequency processing module performs omnibearing scanning, in order to improve the scanning speed, a DSP microprocessor in the intermediate frequency processing module scans and stores the scanning data from the initial frequency according to the bandwidth of 20MHz each time and the stepping frequency of 20MHz each time according to the starting frequency and the stopping frequency of scanning of the upper computer, and splices the scanning data each time until the scanning frequency reaches the stopping frequency to form complete full-frequency-band panoramic scanning data, and sends the complete full-frequency-band panoramic scanning data to the upper computer for spectrum display.
In step S2.2, for the obtained signal which overlaps with the normal station frequency and is not easy to distinguish or the frequency hopping signal, the abnormal signal is analyzed by comparing the channel occupancy rate and the time occupancy rate characteristics with the signal in the signal comparison module after detecting for a certain period of time.
The voice demodulation is carried out by a DSP microprocessor in the intermediate frequency processing module, the DSP microprocessor selects a corresponding demodulation mode according to the command of the upper computer, and the corresponding audio is transmitted to the upper computer for storage after the demodulation is finished.
The invention adopts the wide-band radio frequency front-end module, so that the frequency range of the received radio signal is as low as 9KHz, the shortwave and ultrashort wave frequency ranges are covered, the functions of the equipment are expanded, and two independent signal receiving processing (intermediate frequency and audio frequency) channels can simultaneously or respectively monitor, analyze, record and replay the received signals, thereby improving the utilization rate of the equipment. The signals received by each channel are subjected to two-stage DDC processing and audio processing, and three-stage data streams are output simultaneously, so that flexibility is provided for spectrum display and signal analysis, and monitoring accuracy is improved.
Claims (9)
1. A wide-band binary channels radio monitoring receiving system, it includes receiver and host computer, and the receiver includes shortwave antenna, ultrashort wave antenna and satellite positioning module, its characterized in that: the short wave antenna and the ultra-short wave antenna are connected with a wide-frequency-band radio frequency front end module, the A/D conversion module, the two-way two-stage DDC module, the FIFO first-in first-out high-speed cache module and the intermediate frequency processing module are sequentially connected, and the intermediate frequency processing module is connected with the data storage module and the upper computer; the short wave antenna adopts an active short wave receiving antenna with the frequency range of 9KHz-30 MHz; the ultra-short wave antenna adopts a wide-range antenna with the frequency range of 30MHz-3.6 GHz; the wide-band radio frequency front-end module comprises a short-wave channel and a short-wave channel exceeding the short-wave channel, wherein the short-wave channel is connected with a short-wave antenna, and a superheterodyne structure up-conversion technology is adopted to up-convert a radio frequency signal with the frequency range of 9KHz-30MHz into an intermediate frequency signal with the frequency of 70 MHz; the ultra-short wave channel is connected with an ultra-short wave antenna, and a frequency conversion technology of an ultra-heterodyne structure is adopted to convert a radio frequency signal with the frequency range of 30MHz-3.6GHz into an intermediate frequency signal with the frequency of 70MHz through frequency conversion twice; the radio signals received by the short wave antenna and the ultra-short wave wire are converted into intermediate frequency signals with the frequency of 70MHz and the bandwidth of 20MHz by the wide-band radio frequency front end module, and the intermediate frequency signals are converted by the A/D conversion module and then transmitted to the two-way two-stage DDC module; the two-way two-stage DDC module converts the intermediate frequency signal into a broadband I/O data stream with the output bandwidth of 20MHz and a narrowband I/O data stream with the output bandwidth of 20KHz-4MHz, and the broadband I/O data stream is transmitted to the intermediate frequency processing module for processing after passing through the FIFO first-in first-out high-speed cache module; the intermediate frequency processing module further reduces the received I/O data stream rate and performs full-band fast scanning, data splicing, fourier transformation, data demodulation and audio demodulation; transmitting the processed I/O data stream and audio data stream to an upper computer, and realizing spectrum display, ITU measurement, recording and playback by the upper computer;
The short wave antenna adopts a small whip-shaped active short wave receiving antenna with the frequency of 9KHz-30MHz and a common mode noise choke coil; the broadband radio frequency front-end module comprises a short wave channel and an ultrashort wave channel, the short wave channel and the ultrashort wave channel are switched through a radio frequency switch, the radio frequency switch is connected with a broadband filter, and the broadband filter is connected with a second intermediate frequency amplifier; the bandwidth of the broadband filter is 20MHz; the amplification factors of the second intermediate frequency amplifier are three grades of 15dB, 30dB and 45 dB;
when detecting signals, firstly, manufacturing a signal comparison template: the method comprises the steps of firstly inputting regular station information data acquired from a local radio management department into a regular station database, setting parameters of a template, starting a task of manufacturing a signal comparison template, and starting manufacturing the signal comparison template; acquiring the manufacturing time of a signal comparison module and the position of a receiver through a satellite positioning module; starting a receiver to perform full-band scanning, identifying effective signals for the signals obtained by scanning, estimating the frequency value of each effective signal, and automatically measuring the frequency, bandwidth and level value of each effective signal; after the modulation mode of the effective signal is estimated by an upper computer modulation mode estimation algorithm, the effective signal is compared with data in a regular station database, and the channel occupancy rate and the time occupancy rate are calculated; packaging the setting parameters, the time position information, the original scanning signals, the measurement results, the judgment results, the channel occupancy rate and the time occupancy rate into a signal template, and storing the signal template into a signal comparison template database; then starting the receiver to automatically search for illegal signal tasks: selecting a proper signal comparison template and reading set parameters; acquiring signal comparison template time and receiver position through a satellite positioning module of a receiver, starting full-band scanning of the receiver, performing intermediate frequency measurement on effective signals obtained by scanning, and automatically measuring the frequency, bandwidth and level value of each effective signal; sequentially comparing the signals with the signals in the signal comparison template, marking out signals consistent with the signals in the signal comparison template and inconsistent signals, and carrying out voice demodulation and recording on the inconsistent signals according to the identified modulation mode; outputting a comparison result of inconsistent signals, wherein the result is an abnormal or interference signal automatically detected by a wide-band dual-channel radio monitoring receiving system; the wide-band dual-channel radio monitoring and receiving system adopts a two-way two-stage DDC module as a signal channel, and when one signal channel detects abnormal signals, the other signal channel carries out conventional signal monitoring and frequency spectrum display.
2. The wide-band two-channel radio monitoring and receiving system according to claim 1, wherein: the short wave channel adopts a superheterodyne structure up-conversion technology and comprises a low-pass filter with a bandwidth of 30MHz, a second controllable attenuator, a second preamplifier, a third local oscillator and a mixer which are sequentially connected, and the short wave channel up-converts a radio frequency signal with a frequency of 9kHz-30MHz into an intermediate frequency signal with a frequency of 70 MHz; the attenuation coefficient of the second controllable attenuator is 0-62dB, the step is 1dB, and the second controllable attenuator is controlled by an upper computer; the second preamplifier is 22dB fixed amplification factor; the third local oscillation frequency is 80-100MHz, and an intermediate frequency signal with the frequency of 70MHz is obtained after mixing; the ultra-short wave channel adopts a super heterodyne structure frequency conversion technology and comprises a pre-selector, a first controllable attenuator, a first preamplifier, a first mixer, a first intermediate frequency amplifier and a second mixer which are sequentially connected, and a radio frequency signal with the frequency of 30MHz-3.6GHz is converted into an intermediate frequency signal with the frequency of 70MHz through twice down conversion; the attenuation coefficient of the first controllable attenuator is 0-62dB, and the first controllable attenuator is controlled by upper computer software to step by 1dB; the first preamplifier is 10dB fixed amplification factor; when the frequency of an input radio frequency signal is 30-1700MHz, the first local oscillation frequency is 2290-3960MHz, a first intermediate frequency signal with the frequency of 2260MHz is obtained after mixing, the second local oscillation frequency is 2330MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after mixing; when the frequency of an input radio frequency signal is 1700-3600MHz, the first local oscillation frequency is 2740-4640MHz, a first intermediate frequency signal with the frequency of 1040MHz is obtained after mixing, the second local oscillation frequency is 1110MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after mixing; the pre-selector is divided into 13 sections, and each section has a frequency range of 30-50MHz、50-80MHz、80-126MHz、126-200MHz、192-323MHz、307-508MHz、492-768MHz、752-1008MHz、992-1328MHz、1312-1748MHz、1732-3398MHz、2382-3108MHz and 3092-3600MHz respectively.
3. The wide-band two-channel radio monitoring reception system according to claim 1 or 2, characterized in that: the two-way two-stage DDC module comprises a field programmable gate array FPGA chip, wherein the field programmable gate array FPGA chip extracts two independent DDC receiving channels, each channel is provided with two stages of cascaded DDCs, the first stage DDC outputs a broadband I/Q data stream with the bandwidth of 20MHz, and the second stage DDC outputs a narrowband I/Q data stream with the bandwidth of 20kHz-4 MHz.
4. A wide band dual channel radio monitoring reception system according to claim 3, characterized in that: the intermediate frequency processing module comprises a DSP microprocessor, wherein the DSP microprocessor comprises noise suppression, a demodulation filter, a wave trap, AGC gain control, a demodulator, audio gain control, an audio filter and a control parameter analysis module, so that the I/Q data flow rate is further reduced, and Fourier transform FFT, digital filtering, digital demodulation, audio demodulation and noise suppression are completed; the control command analysis module is connected with the intermediate frequency processing module and used for receiving the control command of the intermediate frequency processing module, analyzing and controlling the local oscillation frequency, the attenuation coefficient of the controllable attenuator, the amplification factor of the amplifier and the switch control of the short wave channel and the ultrashort wave channel; the intermediate frequency processing module is also connected with a memory, and the memory is used for storing I/O stream data generated after the conversion of the two-way two-stage DDC module.
5. The wide band dual channel radio monitoring reception system of claim 4, wherein: the upper computer has the function of monitoring the receiver and has the functions of spectrum display, ITU measurement, storage, task management, data demodulation mode and voice demodulation; the spectrum display has three spectrum display areas, and simultaneously displays a broadband real-time spectrum with the frequency of 20MHz, a narrowband spectrum with the frequency of 20kHz-4MHz and an audio real-time spectrum with the bandwidth of 20 kHz-320 kHz, and simultaneously carries out two paths of ITU measurement, recording and playback.
6. A method for detecting signals in a wide-band two-channel radio monitoring and receiving system according to any one of claims 1 to 5, characterized in that: it comprises the following steps:
s1, manufacturing a signal comparison template:
S1.1, inputting regular station information data acquired from a local area radio management department into a regular station database, wherein the information data comprises center frequency, bandwidth, modulation mode, modulation parameters, transmitting power and station position of a regular station; setting parameters of a template, wherein the parameters comprise a frequency band scanning sweep frequency range, a sweep frequency step, a radio frequency attenuation coefficient, an intermediate frequency measurement bandwidth, a resolution bandwidth and a judgment threshold; starting a task of manufacturing a signal comparison template, and starting to manufacture the signal comparison template;
S1.2, acquiring signal comparison module manufacturing time and receiver position through a satellite positioning module; starting the receiver to perform full-band scanning, comparing the signals obtained by scanning with a set judgment threshold, and determining that the signals are higher than a threshold value as effective signals; estimating the frequency value of each effective signal through an upper computer center frequency estimation algorithm, taking the frequency value of the effective signal as the center frequency, taking a preset intermediate frequency bandwidth as a measurement bandwidth, sequentially carrying out intermediate frequency measurement on each effective signal, and automatically measuring the frequency, bandwidth and level value of each effective signal;
S1.3, after the modulation mode of the effective signal is estimated through an upper computer modulation mode estimation algorithm, comparing the effective signal with data in a regular station database established in the S1.1, marking a signal consistent with the regular station and an inconsistent signal, and analyzing the reason of the inconsistent signal; continuously recording the scanned signal data for 1-5 days, and calculating the channel occupancy rate and the time occupancy rate; packaging the setting parameters, the time position information, the original scanning signals, the measurement results, the judgment results, the channel occupancy rate and the time occupancy rate into a signal template, and storing the signal template into a signal comparison template database;
s2, starting the receiver to automatically search illegal signal task
S2.1, selecting a proper signal comparison template, and reading set parameters; acquiring signal comparison template time and receiver position through a satellite positioning module of a receiver, starting full-band scanning of the receiver, comparing signals obtained by scanning with a set judgment threshold, wherein the signals are identified as effective signals which are higher than the threshold, and estimating the frequency value of each effective signal through an upper computer center frequency estimation algorithm; taking the frequency value of the effective signal as the center frequency, taking the preset intermediate frequency bandwidth as the measurement bandwidth, sequentially carrying out intermediate frequency measurement on each effective signal, and automatically measuring the frequency, bandwidth and level value of each effective signal;
S2.2, estimating a modulation mode of an effective signal through an upper computer modulation mode estimation algorithm, sequentially comparing the effective signal with signals in a signal comparison template, marking a signal consistent with the signal comparison template and a signal inconsistent with the signal comparison template, and carrying out voice demodulation and recording on the signal inconsistent with the signal according to an identified modulation mode; outputting a comparison result of inconsistent signals, wherein the result is an abnormal or interference signal automatically detected by a wide-band dual-channel radio monitoring receiving system;
S3, the two-way two-channel radio monitoring and receiving system adopts a two-way two-stage DDC module as a signal channel, and when one signal channel detects abnormal signals, the other signal channel carries out conventional signal monitoring and frequency spectrum display.
7. The method for detecting signals in a wide-band dual-channel radio monitoring receiver system of claim 6, wherein: when the intermediate frequency processing module performs omnibearing scanning, in order to improve the scanning speed, a DSP microprocessor in the intermediate frequency processing module scans and stores the scanning data from the starting frequency according to the 20MHz bandwidth each time and the stepping 20MHz frequency according to the starting and stopping frequencies of scanning of the upper computer, and splices the scanning data each time until the scanning frequency reaches the stopping frequency to form complete full-frequency-band panoramic scanning data, and sends the complete full-frequency-band panoramic scanning data to the upper computer for spectrum display.
8. The method for detecting signals in a wide-band dual-channel radio monitoring receiver system according to claim 6 or 7, wherein: in the step S2.2, for the obtained signal which overlaps with the normal station frequency and is not easy to distinguish or the frequency hopping signal, the abnormal signal is analyzed by comparing the channel occupancy rate and the time occupancy rate characteristics with the signal in the signal comparison module after detecting for a certain period of time.
9. The method for detecting signals in a wide band dual channel radio monitoring receiver system of claim 8, wherein: the voice demodulation is carried out by a DSP microprocessor in the intermediate frequency processing module, the DSP microprocessor selects a corresponding demodulation mode according to the command of the upper computer, and the corresponding audio is transmitted to the upper computer for storage after the demodulation is finished.
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