CN113810072A - Wide-frequency-band dual-channel radio monitoring receiving system and signal detecting method - Google Patents
Wide-frequency-band dual-channel radio monitoring receiving system and signal detecting method Download PDFInfo
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Abstract
The invention discloses a wide-band two-channel radio monitoring 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, an FIFO (first-in first-out) cache 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 ultrashort wave antenna. The wide-band radio frequency front-end module comprises a short wave channel and an over short wave channel, the received radio signals are converted into intermediate frequency signals with the frequency of 70MHz and the bandwidth of 20MHz, and the upper computer realizes frequency spectrum display, ITU measurement, recording and playback. The invention adopts the wide-band radio frequency front-end module, covers short-wave and ultrashort-wave frequency bands, expands the functions of the equipment, and can simultaneously or respectively monitor, analyze, record and playback the received signals by two independent signal receiving channels, thereby improving the utilization rate of the equipment and the monitoring accuracy.
Description
Technical Field
The invention relates to the technical field of radio signal monitoring, in particular to a wide-band dual-channel radio monitoring receiving system and a signal detecting method.
Background
After years of construction, radio management departments in provinces and cities realize monitoring and management of radio in key areas of the areas through the fixed monitoring station, the small monitoring station, the mobile monitoring station and the movable monitoring station, and the radio order of the areas is guaranteed. However, with the application of new technology and the research and development of new devices, the performance of the domestic existing monitoring station can be improved and optimized, and the radio monitoring task can be completed better.
Radio frequency spectrum monitoring receiver that present radio management department used divide into shortwave receiver and ultrashort wave receiver according to the wave band, and shortwave receiver carries out shortwave monitoring function, and ultrashort wave receiver carries out ultrashort wave monitoring function, lacks the monitoring receiver of shortwave ultrashort wave frequency channel integration, in the occasion of needs simultaneous monitoring shortwave and ultrashort wave frequency channel, often need be equipped with two sets of equipment, causes with high costs, bulky, the inconvenient problem of use. In addition, the existing receiver adopts a single-channel DDC processing channel, outputs a baseband I, Q data stream, provides the data stream for upper computer monitoring software to perform spectrum display and measurement analysis, and cannot meet the requirements when a plurality of signals need to be monitored simultaneously. Only through one-stage DDC processing, I, Q data streams with one bandwidth are output at a time, only one spectrogram is displayed in spectrum display, and signals cannot be intuitively known from the global and local parts simultaneously in signal analysis.
Disclosure of Invention
The invention aims to provide a wide-band two-channel radio monitoring receiving system and a method for detecting signals, wherein the frequency monitoring range is from 9KHz to 3.6GHz, and the frequency monitoring system covers short-wave and ultra-short-wave frequency bands; the system has two-stage DDC processing and audio processing, and respectively outputs broadband I/Q data stream with the bandwidth of 20MHz, narrowband I/Q data stream with the bandwidth of 20kHz-4MHz and an audio data stream, and can simultaneously display three spectrograms when displaying frequency spectrums, thereby facilitating the analysis of signals from local and global, providing flexibility for frequency spectrum display and signal analysis, and improving the monitoring accuracy; the wireless signal receiving and processing system is provided with two paths of independent signal receiving and processing (intermediate frequency and audio frequency) channels, can monitor, analyze, record and playback radio signals simultaneously or respectively, and improves the utilization rate of equipment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a wide-band two-channel radio monitoring receiving system comprises a receiver and an upper computer, wherein the receiver comprises a short-wave antenna, an ultra-short-wave antenna and a satellite positioning module, the short-wave antenna and the ultra-short-wave antenna are connected with a wide-band radio frequency front-end module, the wide-band radio frequency front-end module is connected with a two-way two-stage DDC module, an FIFO (first in first out) cache module and an intermediate frequency processing module through an A/D (analog to digital) conversion module, 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 an over short wave channel, 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 the ultra-short wave antenna, and a frequency conversion technology with a super heterodyne structure is adopted to convert a radio frequency signal with a frequency range of 30MHz-3.6GHz into an intermediate frequency signal with a frequency of 70MHz through two times of down-conversion; the wide-band radio frequency front-end module converts radio signals received by the short-wave antenna and the ultra-short-wave wire into intermediate-frequency signals with the frequency of 70MHz and the bandwidth of 20MHz, 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-path two-stage DDC module converts the intermediate frequency signal into a broadband 1/O data stream with the output bandwidth of 20MHz and a narrow-band I/O data stream with the output bandwidth of 20KHz-4MHz, and the data streams are transmitted to the intermediate frequency processing module for processing after passing through the FIFO first-in first-out cache module; the intermediate frequency processing module further reduces the received I/O data flow rate, and performs full-band fast scanning, data splicing, Fourier transform, data demodulation and audio demodulation; and transmitting the processed I/O data stream and the audio data stream to an upper computer, and comparing the processed I/O data stream and the audio data stream with the stored radio signals by the upper computer to realize frequency 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 wide-frequency-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 wide-band filter, and the wide-band filter is connected with a second intermediate frequency amplifier; the bandwidth of the broadband filter is 20 MHz; the amplification factor of the second intermediate frequency amplifier is 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 sequentially connected, wherein a radio-frequency signal with a frequency of 9kHz-30MHz is up-converted 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 control is carried out through an upper computer; the second preamplifier is 22dB fixed amplification factor; the third local oscillator frequency is 80-100MHz, and an intermediate frequency signal with the frequency of 70MHz is obtained after frequency mixing; the ultrashort wave channel adopts a 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 and stepped by 1 dB; the first preamplifier is at a fixed amplification factor of 10 dB; when the frequency of the 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 frequency mixing, the second local oscillation frequency is 2330MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after frequency mixing; when the frequency of the input radio frequency signal is 1700-3600MHz, the first local oscillator frequency is 2740-4640MHz, the first intermediate frequency signal with the frequency of 1040MHz is obtained after frequency mixing, the second local oscillator frequency is 1110MHz, and the intermediate frequency output signal with the frequency of 70MHz is obtained after frequency mixing; the preselector is divided into 13 sections, and the frequency ranges of each section are respectively 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 3092-3600 MHz.
Preferably, the two-way two-stage DDC module comprises a Field Programmable Gate Array (FPGA) chip, the FPGA chip extracts two independent DDC receiving channels, each channel is provided with two-stage cascaded DDC, 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 module, a demodulation filter, a wave trap, an AGC gain control module, a demodulator, an audio gain control module, an audio filter, and a control parameter analysis module, and further reduces the I/Q data stream rate, and completes a fourier transform FFT, a digital filtering module, a digital demodulation module, an audio demodulation module, and a noise suppression module.
Preferably, the wideband radio frequency front end module further comprises a control command parsing module, and the control command parsing module is connected to the intermediate frequency processing module and is configured to receive a control command from the intermediate frequency processing module, parse and control the local oscillator frequency, the attenuation coefficient of the controllable attenuator, the amplification factor of the amplifier, and the on-off control of the short wave channel and the ultrashort 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 conversion by the two-way two-stage DDC module.
Preferably, the upper computer has the conventional function of a monitoring receiver, and has the functions of frequency spectrum display, ITU measurement, storage, task management, data demodulation mode and voice demodulation; the frequency spectrum display has three frequency spectrum display regions, a broadband real-time frequency spectrum with the frequency of 20MHz, a narrow-band frequency spectrum with the frequency of 20kHz-4MHz and an audio real-time frequency spectrum with the bandwidth of 20 kHz-320 kHz are displayed at the same time, and ITU measurement, recording and playback of two paths are carried out at the same time.
Preferably, the a/D conversion module adopts a high-speed 16-bit 100MSPS conversion module, and supports analog signal input with a maximum bandwidth of 50 MHz.
A method for detecting signals in a wide band dual channel radio monitoring receiving system, as described above, comprising the steps of:
s1, manufacturing a signal comparison template:
s1.1, firstly, inputting information data of a normal station acquired from a local radio management department into a normal station database, wherein the information data comprises the central frequency, the bandwidth, the modulation mode, the modulation parameter, the transmitting power and the station position of the normal station; setting parameters of the template, wherein the parameters comprise frequency band scanning sweep frequency range, sweep frequency stepping, radio frequency attenuation coefficient, intermediate frequency measurement bandwidth, resolution bandwidth and judgment threshold; starting a task of making a signal comparison template, and starting to make the signal comparison template;
s1.2, acquiring signal comparison template manufacturing time and receiver position through a satellite positioning module; starting a receiver to perform full-band scanning, comparing a signal obtained by scanning with a set judgment threshold, and determining the signal higher than the threshold as an effective signal; estimating the frequency value of each effective signal by an upper computer central frequency estimation algorithm, sequentially carrying out intermediate frequency measurement on each effective signal by taking the frequency value of the effective signal as a central frequency and a preset intermediate frequency bandwidth as a measurement bandwidth, and automatically measuring the frequency, the bandwidth and the 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 modulation mode with data in a normal station database established in the S1.1, marking out signals consistent with the normal station and inconsistent signals, and analyzing reasons for the inconsistent signals; continuously recording signal data scanned for 1-5 days, and calculating the occupancy rate of a channel and the occupancy rate of time; packing the set 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 in a signal comparison template database;
s2, starting the task of automatically searching illegal signals by the receiver
S2.1, selecting a proper signal comparison template, and reading set parameters; acquiring signal comparison template time and a receiver position through a satellite positioning module of the receiver, starting full-band scanning of the receiver, comparing the scanned signals with a set judgment threshold, determining the signals higher than the threshold as effective signals, and estimating the frequency value of each effective signal through an upper computer central frequency estimation algorithm; taking the frequency value of the effective signal as a central 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;
s2.2, estimating the modulation mode of the effective signal through an upper computer modulation mode estimation algorithm, sequentially comparing the modulation mode with the signal in the signal comparison template, marking a consistent signal and an inconsistent signal in the signal comparison template, and carrying out voice demodulation and recording on the inconsistent signal according to the identified modulation mode; outputting the comparison result of the inconsistent signals, wherein the result is the abnormal or interference signals automatically detected by the wide-band dual-channel radio monitoring receiving system;
s3, the wide frequency band dual-channel radio monitoring receiving system adopts a dual-channel two-stage DDC module as a signal channel, when one channel of the signal channel detects abnormal signals, the other channel of the signal channel carries out conventional signal monitoring and frequency spectrum display.
Preferably, when the intermediate frequency processing module performs omnibearing scanning, in order to improve the scanning speed, the DSP microprocessor in the intermediate frequency processing module scans and stores the data from the initial frequency according to the initial frequency and the final frequency scanned by the upper computer, scans and stores the data from the initial frequency to the final frequency, splices the scanned data of each time to form a complete full-band panoramic scanning data, and sends the data to the upper computer for spectrum display.
Preferably, in the step S2.2, for the obtained signal or frequency hopping signal which is overlapped with the normal station frequency and is not easy to distinguish, the abnormal signal is analyzed by comparing the occupancy rate of the channel and the occupancy rate of the time with the signal in the signal comparison template after detecting for a certain time.
Preferably, the voice demodulation is demodulated by a DSP microprocessor in the intermediate frequency processing module, the DSP microprocessor selects a corresponding demodulation mode according to a command of the upper computer, and corresponding audio is transmitted to the upper computer for storage after the demodulation is finished.
S1.2, the upper computer frequency estimation algorithm is that the upper computer obtains the maximum value of the frequency band signal frequency, and the maximum value is determined as the estimated central frequency.
S1.3, a modulation mode estimation algorithm carries out modulation recognition by adopting a threshold and decision tree modulation recognition method, the recognition method sets a threshold for each feature, input signals are classified into different modulation groups through the thresholds, and a decision flow is used to judge the specific modulation mode of the signals by combining a plurality of features.
The invention has the beneficial effects that:
(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, two independent signal receiving and processing channels (intermediate frequency and audio frequency) can simultaneously or respectively monitor, analyze, record and playback the received signal, and the utilization rate of the equipment is improved. Signals received by each channel are subjected to two-stage DDC processing and audio processing, and three-stage data streams are simultaneously output, so that flexibility is provided for frequency spectrum display and signal analysis, and monitoring accuracy is improved;
(2) the short-wave antenna adopts a small whip-shaped active antenna with a common-mode noise choke coil to greatly reduce the volume of the antenna, so that the 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 line 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 the 16-bit conversion digit;
(4) in the invention, the data stream output by the FIFO (first in first out) cache module and the two-way two-stage DDC (direct digital control) module provides cache to realize real-time processing of multi-channel signals;
(5) the DSP microprocessor of the invention combines the FIFO cache module and the memory, thus improving the scanning speed of the full-band fast scanning; when a general receiver carries out full-band fast scanning, the broadband data scanned each time is sent to an upper computer, the data is spliced through the upper computer, and one-time full-band scanning is completed under the influence of the number of times of uploading receipts and a transmission mode, so that the speed cannot be very fast; according to the invention, data are spliced and put into the DSP microprocessor for processing, and the data are transmitted to the upper computer once after the splicing is finished, so that the scanning speed is greatly increased; meanwhile, operations such as Fourier transform, data demodulation, audio demodulation and the like are transplanted to a DSP microprocessor for carrying out, so that the CPU resource of an upper computer is not excessively occupied, and the processing performance of the system is greatly improved;
(6) the invention has high integration level, wide monitoring range, fine design and high flexibility, has higher accuracy of monitoring and analyzing 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 simultaneous monitoring of two-path signals, rapid signal search, signal interception, signal identification, broadband recording, offline analysis and the like, has the capabilities of reconnaissance discovery of unknown signals, monitoring and warning of known signals, interception and processing of known signals and the like, supports automatic and various human interaction working modes, and can be widely applied to frequency spectrum monitoring work of local and military 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 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The wide-band two-channel radio monitoring receiving system shown in fig. 1 and fig. 2 comprises a receiver and an upper computer, wherein the receiver comprises a short-wave antenna, an ultra-short-wave antenna and a satellite positioning module, the short-wave antenna and the ultra-short-wave antenna are connected with a wide-band radio frequency front-end module, the wide-band radio frequency front-end module is connected with a two-way two-stage DDC module, a first-in first-out cache module and an intermediate frequency processing module through an a/D conversion module, and the intermediate frequency processing module is connected with a data storage module and the upper computer; the short wave antenna adopts a small whip-shaped active short wave receiving antenna with a common mode noise choke coil and a 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 an over short wave channel, 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 the ultra-short wave antenna, and a frequency conversion technology with a super heterodyne structure is adopted to convert the radio frequency signal with the frequency range of 30MHz-3.6GHz into an intermediate frequency signal with the frequency of 70MHz through twice frequency conversion; the wide-band radio frequency front-end module converts radio signals received by the short-wave antenna and the ultra-short-wave wire into intermediate-frequency signals with the frequency of 70MHz and the bandwidth of 20MHz, 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-path two-stage DDC module converts the intermediate frequency signal into a broadband 1/O data stream with the output bandwidth of 20MHz and a narrow-band I/O data stream with the output bandwidth of 20KHz-4MHz, and the data streams are transmitted to the intermediate frequency processing module for processing after passing through the FIFO first-in first-out cache module; the intermediate frequency processing module further reduces the received I/O data flow rate, and performs full-band fast scanning, data splicing, Fourier transform, data demodulation and audio demodulation; and transmitting the processed I/O data stream and the audio data stream to an upper computer, and comparing the processed I/O data stream and the audio data stream with the stored radio signals by the upper computer to realize frequency 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-frequency-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 wide-band filter, and the wide-band filter is connected with a second intermediate frequency amplifier; the bandwidth of the broadband filter is 20 MHz; the amplification factor of the second intermediate frequency amplifier is three levels of 15dB, 30dB and 45 dB.
The short wave channel adopts a superheterodyne structure up-conversion technology, comprises a low-pass filter with the bandwidth of 30MHz, a second controllable attenuator, a second preamplifier, a third local oscillator and a frequency mixer which are sequentially connected, and up-converts a radio-frequency signal with the frequency of 9kHz-30MHz into an intermediate-frequency signal with the frequency of 70 MHz; the attenuation coefficient of the second controllable attenuator is 0-62dB, the step is 1dB, and the control is carried out through an upper computer; the second preamplifier is 22dB fixed amplification factor; the third local oscillator frequency is 80-100MHz, and an intermediate frequency signal with the frequency of 70MHz is obtained after frequency mixing; the ultrashort wave channel adopts a frequency conversion technology of a superheterodyne structure, 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 connected in sequence, 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 two times of down-conversion; the attenuation coefficient of the first controllable attenuator is 0-62dB, and the first controllable attenuator is controlled by upper computer software and stepped by 1 dB; the first preamplifier is at a fixed amplification factor of 10 dB; when the frequency of the 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 frequency mixing, the second local oscillation frequency is 2330MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after frequency mixing; when the frequency of the input radio frequency signal is 1700-3600MHz, the first local oscillator frequency is 2740-4640MHz, the first intermediate frequency signal with the frequency of 1040MHz is obtained after frequency mixing, the second local oscillator frequency is 1110MHz, and the intermediate frequency output signal with the frequency of 70MHz is obtained after frequency mixing; the preselector is divided into 13 sections, and the frequency ranges of each section are respectively 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 3092-3600 MHz.
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, two independent DDC receiving channels are extracted from the FPGA chip, each channel is provided with two-stage cascaded DDC, the first-stage DDC outputs broadband I/Q data flow with the bandwidth of 20MHz, and the second-stage DDC outputs narrowband I/Q data flow with the bandwidth of 20kHz-4 MHz.
The intermediate frequency processing module comprises a DSP microprocessor, the DSP microprocessor comprises a noise suppression module, a demodulation filter, a wave trap, an AGC gain control module, a demodulator, an audio gain control module, an audio filter and a control parameter analysis module, 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 also 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 the local oscillator frequency, the attenuation coefficient of the controllable attenuator, the amplification factor of the amplifier and the on-off 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.
The upper computer has the conventional function of monitoring the receiver, and has the functions of frequency spectrum display, ITU measurement, storage, task management, data demodulation mode and voice demodulation; the frequency spectrum display has three frequency spectrum display regions, a broadband real-time frequency spectrum with the frequency of 20MHz, a narrow-band frequency spectrum with the frequency of 20kHz-4MHz and an audio real-time frequency spectrum with the bandwidth of 20 kHz-320 kHz are displayed at the same time, and ITU measurement, recording and playback of two paths are carried out at the same time.
A method for detecting signals in a wide band dual channel radio monitoring receiving system, as described above, comprising the steps of:
s1, manufacturing a signal comparison template:
s1.1, firstly, inputting information data of a normal station acquired from a local radio management department into a normal station database, wherein the information data comprises the central frequency, the bandwidth, the modulation mode, the modulation parameter, the transmitting power and the station position of the normal station; setting parameters of the template, wherein the parameters comprise frequency band scanning sweep frequency range, sweep frequency stepping, radio frequency attenuation coefficient, intermediate frequency measurement bandwidth, resolution bandwidth and judgment threshold; starting a task of making a signal comparison template, and starting to make the signal comparison template;
s1.2, acquiring signal comparison template manufacturing time and receiver position through a satellite positioning module; starting a receiver to perform full-band scanning, comparing a signal obtained by scanning with a set judgment threshold, and determining the signal higher than the threshold as an effective signal; estimating the frequency value of each effective signal by an upper computer central frequency estimation algorithm, sequentially carrying out intermediate frequency measurement on each effective signal by taking the frequency value of the effective signal as a central frequency and a preset intermediate frequency bandwidth as a measurement bandwidth, and automatically measuring the frequency, the bandwidth and the 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 normal station database established in S1.1, marking signals consistent with the normal station and inconsistent signals, and analyzing reasons for the inconsistent signals; continuously recording signal data scanned for 1-5 days, and calculating the occupancy rate of a channel and the occupancy rate of time; packing the set 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 in a signal comparison template database;
s2, starting the task of automatically searching illegal signals by the receiver
S2.1, selecting a proper signal comparison template, and reading set parameters; acquiring signal comparison template time and a receiver position through a satellite positioning module of the receiver, starting full-band scanning of the receiver, comparing the scanned signals with a set judgment threshold, determining the signals higher than the threshold as effective signals, and estimating the frequency value of each effective signal through an upper computer central frequency estimation algorithm; taking the frequency value of the effective signal as a central 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;
s2.2, estimating the modulation mode of the effective signal through an upper computer modulation mode estimation algorithm, sequentially comparing the modulation mode with the signal in the signal comparison template, marking a consistent signal and an inconsistent signal in the signal comparison template, and carrying out voice demodulation and recording on the inconsistent signal according to the identified modulation mode; outputting the comparison result of the inconsistent signals, wherein the result is the abnormal or interference signals automatically detected by the wide-band dual-channel radio monitoring receiving system;
s3, the wide frequency band dual-channel radio monitoring receiving system adopts a dual-channel two-stage DDC module as a signal channel, when one channel of the signal channel detects abnormal signals, the other channel of the signal channel carries out conventional signal monitoring and frequency spectrum display.
When the intermediate frequency processing module carries out all-round scanning, in order to improve scanning speed, a DSP microprocessor in the intermediate frequency processing module scans and stores the scanning data from the initial frequency according to the initial frequency and the final frequency scanned by the upper computer at the frequency of 20MHz bandwidth and 20MHz step by step at each time, scans the scanning data to the final frequency all the time, splices the scanning data at each time to form complete full-frequency-band panoramic scanning data, and sends the full-frequency-band panoramic scanning data to the upper computer for frequency spectrum display.
And S2.2, comparing the signal which is obtained in the step and has frequency overlapping with the normal station and is not easy to distinguish with the frequency hopping signal for a certain time by the signal comparison template to obtain the channel occupancy and time occupancy characteristics, and analyzing abnormal signals.
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 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, short wave and ultrashort wave frequency bands are covered, the functions of the equipment are expanded, two independent signal receiving and processing (intermediate frequency and audio frequency) channels can simultaneously or respectively monitor, analyze, record and playback the received signal, and the utilization rate of the equipment is improved. Signals received by each channel are subjected to two-stage DDC processing and audio processing, and three-stage data streams are simultaneously output, so that flexibility is provided for frequency spectrum display and signal analysis, and monitoring accuracy is improved.
Claims (10)
1. The utility model provides a wide band section binary channels radio monitoring receiving system, it includes receiver and host computer, and the receiver includes short wave antenna, ultrashort wave antenna and satellite positioning module, its characterized in that: the short wave antenna and the ultrashort wave antenna are connected with a wide-band radio frequency front-end module, the wide-band radio frequency front-end module is connected with a two-way two-stage DDC module, a FIFO (first-in first-out) cache module and an intermediate frequency processing module through an A/D (analog-to-digital) conversion module, and the intermediate frequency processing module is connected with a data storage module and an 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 an over short wave channel, 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 the ultra-short wave antenna, and a frequency conversion technology with a super heterodyne structure is adopted to convert the radio frequency signal with the frequency range of 30MHz-3.6GHz into an intermediate frequency signal with the frequency of 70MHz through twice frequency conversion; the wide-band radio frequency front-end module converts radio signals received by the short-wave antenna and the ultra-short-wave wire into intermediate-frequency signals with the frequency of 70MHz and the bandwidth of 20MHz, 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-path two-stage DDC module converts the intermediate frequency signal into a broadband I/O data stream with the output bandwidth of 20MHz and a narrow-band I/O data stream with the output bandwidth of 20KHz-4MHz, and the data streams are transmitted to the intermediate frequency processing module for processing after passing through the FIFO first-in first-out cache module; the intermediate frequency processing module further reduces the received I/O data flow rate, and performs full-band fast scanning, data splicing, Fourier transform, data demodulation and audio demodulation; and transmitting the processed I/O data stream and audio data stream to an upper computer, and realizing frequency spectrum display, ITU measurement, recording and playback by the upper computer.
2. The wide band two channel radio monitoring receiving system of claim 1, wherein: 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 wide-frequency-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 wide-band filter, and the wide-band filter is connected with a second intermediate frequency amplifier; the bandwidth of the broadband filter is 20 MHz; the amplification factor of the second intermediate frequency amplifier is three levels of 15dB, 30dB and 45 dB.
3. The wide-band two-channel radio monitoring receiving system according to claim 1 or 2, wherein: the short wave channel adopts a superheterodyne structure up-conversion technology, comprises a low-pass filter with the bandwidth of 30MHz, a second controllable attenuator, a second preamplifier, a third local oscillator and a frequency mixer which are sequentially connected, and up-converts a radio-frequency signal with the frequency of 9kHz-30MHz into an intermediate-frequency signal with the frequency of 70 MHz; the attenuation coefficient of the second controllable attenuator is 0-62dB, the step is 1dB, and the control is carried out through an upper computer; the second preamplifier is 22dB fixed amplification factor; the third local oscillator frequency is 80-100MHz, and an intermediate frequency signal with the frequency of 70MHz is obtained after frequency mixing; the ultrashort wave channel adopts a frequency conversion technology of a superheterodyne structure, 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 connected in sequence, 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 two times of down-conversion; the attenuation coefficient of the first controllable attenuator is 0-62dB, and the first controllable attenuator is controlled by upper computer software and stepped by 1 dB; the first preamplifier is at a fixed amplification factor of 10 dB; when the frequency of the 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 frequency mixing, the second local oscillation frequency is 2330MHz, and an intermediate frequency output signal with the frequency of 70MHz is obtained after frequency mixing; when the frequency of the input radio frequency signal is 1700-3600MHz, the first local oscillator frequency is 2740-4640MHz, the first intermediate frequency signal with the frequency of 1040MHz is obtained after frequency mixing, the second local oscillator frequency is 1110MHz, and the intermediate frequency output signal with the frequency of 70MHz is obtained after frequency mixing; the preselector is divided into 13 sections, and the frequency ranges of each section are respectively 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 3092-3600 MHz.
4. The wide band two channel radio monitoring receiving system of claim 3, wherein: the two-way two-stage DDC module comprises a Field Programmable Gate Array (FPGA) chip, two independent DDC receiving channels are extracted from the FPGA chip, each channel is provided with two-stage cascaded DDC, the first-stage DDC outputs a broadband I/Q data stream with the bandwidth of 20MHz, and the second-stage DDC outputs a narrow-band I/Q data stream with the bandwidth of 20kHz-4 MHz.
5. The wide band two channel radio monitoring receiving system of claim 4, wherein: the intermediate frequency processing module comprises a DSP microprocessor, the DSP microprocessor comprises a noise suppression module, a demodulation filter, a wave trap, an AGC gain control module, a demodulator, an audio gain control module, an audio filter and a control parameter analysis module, 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 also 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 the local oscillator frequency, the attenuation coefficient of the controllable attenuator, the amplification factor of the amplifier and the on-off 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 conversion of the two-way two-stage DDC module.
6. The wide band two channel radio monitoring receiving system of claim 5, wherein: the upper computer has the conventional function of monitoring the receiver and has the functions of frequency spectrum display, ITU measurement, storage, task management, data demodulation mode and voice demodulation; the frequency spectrum display has three frequency spectrum display regions, a broadband real-time frequency spectrum with the frequency of 20MHz, a narrow-band frequency spectrum with the frequency of 20kHz-4MHz and an audio real-time frequency spectrum with the bandwidth of 20 kHz-320 kHz are displayed at the same time, and ITU measurement, recording and playback of two paths are carried out at the same time.
7. A method for detecting signals in a wide band two channel radio monitoring receiver system as claimed in any one of claims 1 to 10, wherein: it comprises the following steps:
s1, manufacturing a signal comparison template:
s1.1, firstly, inputting information data of a normal station acquired from a local radio management department into a normal station database, wherein the information data comprises the central frequency, the bandwidth, the modulation mode, the modulation parameter, the transmitting power and the station position of the normal station; setting parameters of the template, wherein the parameters comprise frequency band scanning sweep frequency range, sweep frequency stepping, radio frequency attenuation coefficient, intermediate frequency measurement bandwidth, resolution bandwidth and judgment threshold; starting a task of making a signal comparison template, and starting to make the signal comparison template;
s1.2, acquiring signal comparison template manufacturing time and receiver position through a satellite positioning module; starting a receiver to perform full-band scanning, comparing a signal obtained by scanning with a set judgment threshold, and determining the signal higher than the threshold as an effective signal; estimating the frequency value of each effective signal by an upper computer central frequency estimation algorithm, sequentially carrying out intermediate frequency measurement on each effective signal by taking the frequency value of the effective signal as a central frequency and a preset intermediate frequency bandwidth as a measurement bandwidth, and automatically measuring the frequency, the bandwidth and the 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 modulation mode with data in a normal station database established in the S1.1, marking out signals consistent with the normal station and inconsistent signals, and analyzing reasons for the inconsistent signals; continuously recording signal data scanned for 1-5 days, and calculating the occupancy rate of a channel and the occupancy rate of time; packing the set 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 in a signal comparison template database;
s2, starting the task of automatically searching illegal signals by the receiver
S2.1, selecting a proper signal comparison template, and reading set parameters; acquiring signal comparison template time and a receiver position through a satellite positioning module of the receiver, starting full-band scanning of the receiver, comparing the scanned signals with a set judgment threshold, determining the signals higher than the threshold as effective signals, and estimating the frequency value of each effective signal through an upper computer central frequency estimation algorithm; taking the frequency value of the effective signal as a central 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;
s2.2, estimating the modulation mode of the effective signal through an upper computer modulation mode estimation algorithm, sequentially comparing the modulation mode with the signal in the signal comparison template, marking a consistent signal and an inconsistent signal in the signal comparison template, and carrying out voice demodulation and recording on the inconsistent signal according to the identified modulation mode; outputting the comparison result of the inconsistent signals, wherein the result is the abnormal or interference signals automatically detected by the wide-band dual-channel radio monitoring receiving system;
s3, the wide frequency band dual-channel radio monitoring receiving system adopts a dual-channel two-stage DDC module as a signal channel, when one channel of the signal channel detects abnormal signals, the other channel of the signal channel carries out conventional signal monitoring and frequency spectrum display.
8. The method of claim 7, wherein the method further comprises: when the intermediate frequency processing module carries out all-round scanning, in order to improve scanning speed, a DSP microprocessor in the intermediate frequency processing module scans and stores the data from the initial frequency according to the initial frequency and the final frequency scanned by the upper computer, scans the data from the initial frequency to the final frequency all the time according to the 20MHz bandwidth and the stepping 20MHz frequency at each time, splices the data scanned at each time to form complete full-frequency-band panoramic scanning data, and sends the data to the upper computer for frequency spectrum display.
9. The method of claim 7 or 8, wherein the method comprises: in the step S2.2, for the obtained signal or frequency hopping signal which is overlapped with the frequency of the normal station and is not easy to distinguish, the abnormal signal is analyzed by comparing the occupancy rate of the channel and the occupancy rate of the time with the signal in the signal comparison template after detecting for a certain time.
10. The method of claim 9, wherein the method further comprises: 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 corresponding audio is transmitted to the upper computer for storage after the demodulation is finished.
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