CN111614414A - Spectrum monitoring and wireless networking test equipment - Google Patents
Spectrum monitoring and wireless networking test equipment Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 230000006855 networking Effects 0.000 title claims abstract description 24
- 238000001228 spectrum Methods 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 104
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- 230000005670 electromagnetic radiation Effects 0.000 abstract description 9
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/173—Wobbulating devices similar to swept panoramic receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
Abstract
The invention discloses a frequency spectrum monitoring and wireless networking test device, which comprises an antenna, a preselector module, a frequency conversion processing module, a frequency synthesizer module, a digital processing module and a main controller, wherein the preselector module is arranged on the frequency synthesizer module; the main controller is respectively connected with the preselector module, the frequency conversion processing module and the digital processing module through buses; the antenna is connected with the preselector module, the preselector module is connected with the frequency conversion processing module, and the frequency conversion processing module is connected with the digital processing module; the antenna receives the signal and sends the signal to the preselector module, and the preselector module performs selective filtering and amplification processing on the signal; the preselector module sends the signals subjected to selective filtering amplification to the frequency conversion processing module for frequency conversion processing to obtain intermediate frequency signals, and the intermediate frequency signals are sent to the digital processing module after being filtered for signal identification and measurement and then sent to the main controller; and the frequency synthesizer module is used for providing local oscillation signals for frequency mixing for the frequency conversion processing module. The invention can monitor, identify, judge, predict and sense the electromagnetic radiation.
Description
Technical Field
The invention relates to the technical field of wireless networking signal testing, in particular to frequency spectrum monitoring and wireless networking testing equipment.
Background
With the development of wireless communication application, wireless spectrum resources are increasingly tense, and monitoring and management of the wireless spectrum resources are particularly important; by monitoring and analyzing signal parameters such as carrier frequency, transmitting power, modulation mode and the like of the space wireless signals, effective planning and management of the existing wireless resources are realized, and the communication performance and the frequency resource utilization rate of the system can be greatly improved. At present, a key equipment monitoring receiver for spectrum planning and management mainly depends on import, and the defects that the technology is limited by foreign countries and the like exist.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a frequency spectrum monitoring and wireless networking test device capable of monitoring, identifying, judging, predicting and sensing electromagnetic radiation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a frequency spectrum monitoring and wireless networking test device comprises an antenna, a preselector module, a frequency conversion processing module, a frequency synthesizer module, a digital processing module and a main controller; the main controller is respectively connected with the preselector module, the frequency conversion processing module and the digital processing module through buses; the antenna is connected with the preselector module, the preselector module is connected with the frequency conversion processing module, and the frequency conversion processing module is connected with the digital processing module; the antenna receives signals and sends the signals to the preselector module, and the preselector module performs selective filtering and amplification processing on the signals; the preselector module sends the signal subjected to selective filtering amplification to a frequency conversion processing module for frequency conversion processing to obtain an intermediate frequency signal, and the intermediate frequency signal is sent to a digital processing module for signal identification and measurement after being filtered and sent to the main controller after being subjected to FFT (fast Fourier transform); and the frequency synthesizer module is used for providing local oscillation signals for frequency mixing for the frequency conversion processing module.
Furthermore, the main controller, the preselector module, the frequency conversion processing module and the digital processing module are all provided with bus controllers.
Furthermore, the preselector module comprises a protection circuit and a switch filtering and amplifying circuit, wherein the protection circuit is used for large signal protection, and the switch filtering and amplifying circuit is used for selective filtering and low-noise amplification; the switch filtering and amplifying circuit comprises a first four-to-one switch, four paths of first selection filtering and amplifying circuits and a second four-to-one switch; the output end of the antenna is connected with the common end of the first one-of-four switch through a protection circuit, and the four output ends of the first one-of-four switch are respectively connected with the four input ends of the second one-of-four switch through four first selective filtering and amplifying circuits; the four first selective filtering and amplifying circuits respectively complete filtering and amplifying of four frequency bands: frequency band 1: 100 kHz-20 MHz; frequency band 2: 20-1000 MHz; frequency band 3: 1000-1500 MHz; and frequency band 4: 1500-3600 MHz; and the control ends of the first one-out-of-four switch and the second one-out-of-four switch are respectively connected with the main controller through buses.
Further, the first selective filtering and amplifying circuit corresponding to the frequency band 2 further includes a third four-to-one switch, four paths of second selective filtering and amplifying circuits, a first two-to-one switch, a second two-to-one switch, and a third two-to-one switch; each path of second selective filtering amplification circuit comprises a filter; one output end of the first four-out-of-one switch is connected with a common end of the third four-out-of-one switch, two output ends of the third four-out-of-one switch are respectively connected with two input ends of the first two-out-of-one switch through two paths of filters of the second selective filtering amplifying circuit, the other two output ends of the third four-out-of-one switch are respectively connected with two input ends of the second two-out-of-one switch through two paths of filters of the second selective filtering amplifying circuit, common ends of the first two-out-of-one switch and the second two-out-of-one switch are respectively connected with two input ends of the third two-out-of-one switch through an amplifier, and a common end of the third two-out-of-one switch is connected with one input end of the; the filters of the four paths of second selective filtering amplifying circuits respectively complete the filtering of four sub-frequency bands: 1) 20-70 MHz, 2) 70-200 MHz, 3) 200-560 MHz, 4) 560-1000 MHz; and the control ends of the third one-of-four switch and the first to third one-of-two switches are respectively connected with the main controller through buses.
Furthermore, the first selective filtering and amplifying circuit corresponding to the frequency band 4 further comprises a fourth alternative switch, two paths of third selective filtering and amplifying circuits and a fifth alternative switch, and each path of third selective filtering and amplifying circuit comprises a filter; one output end of the first one-of-four switch is connected with a common end of the fourth one-of-four switch, two output ends of the fourth one-of-four switch are respectively connected with two input ends of the fifth one-of-four switch through two paths of filters of the third selective filtering and amplifying circuit, and the common end of the fifth one-of-four switch is connected with one input end of the second one-of-four switch through an amplifier; the two filters of the third selective filtering amplifying circuit respectively complete the filtering of two sub-frequency bands: 1) 1500-2300 MHz, 2) 2300-3600 MHz; and the control ends of the fourth and fifth alternative switches are respectively connected with the main controller through buses.
Furthermore, the frequency conversion processing module comprises a first frequency conversion processing circuit, a second frequency conversion processing circuit, an intermediate frequency AGC circuit and a third frequency conversion processing circuit which are connected in sequence; each frequency conversion processing circuit comprises an amplifier, a mixer and a filter which are connected in sequence; the intermediate frequency AGC circuit consists of a wave detector and a digital attenuator; the three frequency conversion processing circuits sequentially carry out high-intermediate frequency and three-time frequency conversion processing on the signals subjected to selective filtering amplification, wherein the first intermediate frequency is 4329.7MHz, the second intermediate frequency is 229.7MHz, and the third intermediate frequency is 10.7MHz, and finally 10.7MHz intermediate frequency signals are obtained.
Further, the frequency synthesizer module comprises a first local oscillator, a second local oscillator and a third local oscillator, and the first local oscillator, the second local oscillator and the third local oscillator respectively provide local oscillator signals for frequency mixing for frequency mixers of the three frequency conversion processing circuits; the first local oscillator is composed of a DDS circuit, a filtering amplification circuit, a PLL phase-locked loop and a post-stage amplifier circuit, the second local oscillator is composed of an ADF4156, a loop filter, a VCO, an amplifier and a filter, and the third local oscillator is composed of the ADF4156, the loop filter, the VCO, a divide-by-two frequency divider, the amplifier and the filter.
Furthermore, the digital processing module comprises a VGA module, an A/D conversion module, a DDC module, an FFT module and a demodulation module; the 10.7MHz intermediate frequency signal and the 10MHz reference signal enter the VGA module through the two-way switch, the VGA module, the A/D conversion module and the DDC module are sequentially connected, and the FFT module and the demodulation module are both connected with the DDC module.
Further, the main controller comprises a processor, a function panel and an audio and interface; the function panel, the audio and the interface are connected with the processor.
Furthermore, the test equipment also comprises a power supply module and a human-computer interaction module; the power supply module provides a direct current power supply for the test equipment; the man-machine interaction module comprises a key module for inputting a control command and a display module for displaying output data; the key module is connected with the input end of the main controller, and the display module is connected with the output end of the main controller.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the invention can monitor, identify, judge, predict and sense electromagnetic radiation and master the electromagnetic environment situation, provides basic data of real-time battlefield electromagnetic environment and real-time working condition of communication equipment for field maintenance guarantee in wartime and training, ensures real-time and efficient maintenance guarantee and training activities, and helps maintenance and guarantee personnel to take proper technical countermeasures and guarantee self safety under various electromagnetic interference conditions.
When a communication fault occurs, the method and the system can help to ensure that maintenance personnel can quickly distinguish whether the communication equipment is interfered or has a fault per se, and do not need to blindly check the equipment or replace a communication module, so that the communication, the maintenance and the maintenance are more targeted, namely the guarantee cost of the communication equipment is reduced, and the equipment completeness rate and the combat communication level are improved.
Drawings
FIG. 1 is a functional block diagram of the components of the apparatus of the present invention;
FIG. 2 is a block diagram of the components of the preselector module of the present invention;
FIG. 3 is a functional block diagram of the components of the frequency conversion processing module of the present invention;
FIG. 4 is a hardware composition and basic functional block diagram of the present invention;
FIG. 5 is a basic functional block diagram of the master controller of the present invention;
FIG. 6 is a flow chart of the single frequency measurement function implementation of the present invention;
FIG. 7 is a flow chart of the digital scan function execution of the present invention;
FIG. 8 is a flow chart of the frequency scanning function execution of the present invention;
fig. 9 is a flow chart of the wireless networking monitor function execution of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention discloses a spectrum monitoring and wireless networking test device, which comprises an antenna, a preselector module, a frequency conversion processing module, a frequency synthesizer module, a digital processing module and a main controller; the main controller, the preselector module, the frequency conversion processing module and the digital processing module are all provided with a bus controller, and the main controller is respectively connected with the preselector module, the frequency conversion processing module and the digital processing module through buses; the antenna is connected with the preselector module, the preselector module is connected with the frequency conversion processing module, and the frequency conversion processing module is connected with the digital processing module; the antenna receives signals and sends the signals to the preselector module, and the preselector module performs selective filtering and amplification processing on the signals, so that the selectivity of input signals is improved; the preselector module sends the signals subjected to selective filtering amplification to the frequency conversion processing module for high-intermediate frequency and three-time frequency conversion processing to obtain 10.7MHz intermediate frequency signals, the 10.7MHz intermediate frequency signals are sent to the digital processing module for signal identification and measurement after being filtered, and sent to the main controller after being subjected to FFT (fast Fourier transform), and finally the main controller displays the processed data; and the frequency synthesizer module is used for providing local oscillation signals for frequency mixing for the frequency conversion processing module.
The pre-selector module is used for providing gain for weak signals to improve the sensitivity of the monitoring receiver, providing attenuation for strong signals to prevent the strong signals from exceeding the linear range of the monitoring receiver, and providing enough high selective filtering capability for input signals of full frequency bands to filter useless signals and extract signals which are interesting to a monitor. The frequency conversion processing module is used as a receiving front-end circuit of the equipment and mainly completes the frequency conversion and amplification functions of received signals. In consideration of the suppression of the image frequency and the control of the relative working bandwidth of the local oscillator, the device adopts a scheme of high intermediate frequency and triple frequency conversion, and provides a dynamic range of 50dB, wherein the first intermediate frequency is 4329.7MHz, the second intermediate frequency is 229.7MHz, and the third intermediate frequency is 10.7 MHz.
As shown in fig. 2, the preselector module includes a protection circuit for large signal protection and a switching filter amplifier circuit for selective filtering and low noise amplification; the switch filtering and amplifying circuit comprises a first four-to-one switch, four paths of first selecting and filtering and amplifying circuits and a second four-to-one switch; the output end of the antenna is connected with the common end of the first one-of-four switch through a protection circuit, and the four output ends of the first one-of-four switch are respectively connected with the four input ends of the second one-of-four switch through four paths of first selective filtering and amplifying circuits; the four first selective filtering and amplifying circuits respectively complete filtering and amplifying of four frequency bands: frequency band 1: 100 kHz-20 MHz; frequency band 2: 20-1000 MHz; frequency band 3: 1000-1500 MHz; and frequency band 4: 1500-3600 MHz; the control ends of the first one-out-of-four switch and the second one-out-of-four switch are respectively connected with the main controller through buses.
As shown in fig. 2, the first selective filtering and amplifying circuit corresponding to the frequency band 2 further includes a third one-out-of-four switch, four paths of second selective filtering and amplifying circuits, a first one-out-of-two switch, a second one-out-of-two switch, and a third one-out-of-two switch; each path of second selective filtering amplification circuit comprises a filter; one output end of the first four-out-of-one switch is connected with a common end of the third four-out-of-one switch, two output ends of the third four-out-of-one switch are respectively connected with two input ends of the first two-out-of-one switch through two paths of filters of the second selective filtering amplifying circuit, the other two output ends of the third four-out-of-one switch are respectively connected with two input ends of the second two-out-of-one switch through two paths of filters of the second selective filtering amplifying circuit, common ends of the first two-out-of-one switch and the second two-out-of-one switch are respectively connected with two input ends of the third two-out-of-one switch through an amplifier, and a common end of the third two-out-of-one switch is connected with one input end of; the four filters of the second selective filtering amplifying circuit respectively complete the filtering of four sub-frequency bands: 1) 20-70 MHz, 2) 70-200 MHz, 3) 200-560 MHz, and 4) 560-1000 MHz. The control ends of the third four-to-one switch and the first to third two-to-one switches are respectively connected with the main controller through buses.
As shown in fig. 2, the first selective filtering and amplifying circuit corresponding to the frequency band 4 further includes a fourth alternative switch, two third selective filtering and amplifying circuits, and a fifth alternative switch, where each third selective filtering and amplifying circuit includes a filter; one output end of the first one-of-four switch is connected with a common end of the fourth one-of-two switch, two output ends of the fourth one-of-two switch are respectively connected with two input ends of the fifth one-of-two switch through two paths of filters of the third selective filtering and amplifying circuit, and the common end of the fifth one-of-two switch is connected with one input end of the second one-of-four switch through an amplifier; the two filters of the third selective filtering amplifying circuit respectively complete the filtering of two sub-frequency bands: 1) 1500-2300 MHz, 2) 2300-3600 MHz; the control ends of the fourth and fifth alternative switches are respectively connected with the main controller through buses.
As shown in fig. 3, the frequency conversion processing module includes a first frequency conversion processing circuit, a second frequency conversion processing circuit, an intermediate frequency AGC circuit, and a third frequency conversion processing circuit, which are connected in sequence; each frequency conversion processing circuit comprises an amplifier, a mixer and a filter which are connected in sequence; the three frequency conversion processing circuits sequentially carry out high-intermediate frequency and three-time frequency conversion processing on the signals subjected to selective filtering amplification processing. The first intermediate frequency is 4329.7MHz, the second intermediate frequency is 229.7MHz, and the third intermediate frequency is 10.7MHz, and finally, a 10.7MHz intermediate frequency signal is obtained. The intermediate frequency AGC circuit consists of a detector and a digital Attenuator (ATT) and is used for completing automatic gain control of equipment so as to adapt to a complex and variable electromagnetic radiation environment; the 10.7MHz intermediate frequency signals are respectively output through four groups of analog intermediate frequency filters so as to deal with various electromagnetic radiation analysis application scenes. The intermediate frequency AGC circuit and the control end of the intermediate frequency output filter change-over switch are connected with a main controller through a bus.
As shown in fig. 1, the frequency synthesizer module includes a first local oscillator, a second local oscillator, and a third local oscillator, and provides local oscillator signals for frequency mixing for the mixers of the three frequency conversion processing circuits, respectively; the first local oscillator consists of a DDS circuit, a filtering amplification circuit, a PLL phase-locked loop and a post-amplifier circuit, the second local oscillator consists of an ADF4156, a loop filter, a VCO, an amplifier and a filter, and the third local oscillator consists of an ADF4156, a loop filter, a VCO, a divide-by-two frequency divider, an amplifier and a filter.
As shown in fig. 4, the digital processing module includes a VGA module, an a/D conversion module, a DDC module, an FFT module, and a demodulation module; the 10.7MHz intermediate frequency signal and the 10MHz reference signal enter the VGA module through the two-way switch, the VGA module, the A/D conversion module and the DDC module are sequentially connected, and the FFT module and the demodulation module are both connected with the DDC module.
The digital processing module is used for completing the demodulation of AM, FM, USB, LSB, PULSE, CW and IQ signals and simultaneously providing the function of converting the analog intermediate frequency into the digital intermediate frequency for outputting. The digital processing module has high demodulation sensitivity, large demodulation dynamic range, rapid demodulation and high conversion precision.
The digital processing module adopts software radio technology, complex algorithms such as identification of a signal modulation mode and the like are completed by DSP software, and down conversion and demodulation require real-time processing functions to be completed by an FPGA; the suppression of the image signal in the orthogonal frequency mixing receiver is realized by adopting a complex filter, the pressure of the front-end radio frequency circuit on the attenuation of the image signal is reduced, and the complexity of the receiver is reduced; the large dynamic range of the received signal is realized through an intermediate frequency AGC circuit, a high bit wide band ADC and a digital AGC in an FPGA together; filtering and limiting external noise except human voice in the sampling information by a voice noise reduction enhancement algorithm in a DSP (digital signal processor) or FPGA (field programmable gate array) for voice signals demodulated from the FPGA, so that the signal-to-noise ratio in the voice signals is improved, and voice analog signals are formed by digital/analog conversion, so that the aim of improving the voice quality is fulfilled; the communication with the external interface and the control signal is completed by the peripheral interface rich in DSP.
As shown in fig. 5, the main controller includes a processor, a function panel, and an audio and interface; the function panel, the audio and the interface are connected with the processor. The main controller selects an ARM S3C2410X chip as a main processor to complete internal control and external connection. The inside of the device mainly adopts a parallel control mode, the digital connection between the device and the outside adopts a serial-parallel combination mode, and the device also has the function of storing and forwarding control commands. The main controller controls each module in the machine in a bus mode, and the controlled objects comprise: the system comprises a preselector module, a frequency conversion processing module, a frequency synthesis module and a digital processing module, wherein the preselector module, the frequency conversion processing module, the frequency synthesis module and the digital processing module are used for detecting the temperature in the machine, the battery voltage and the working state of each module; the main functions implemented are: full-band automatic frequency band scanning, in-band scanning, manual dot frequency scanning, setting of modulation modes (FM, AM, PULSE, CW, USB, LSB and IQ), data unloading and data interaction with a computer; external interface: RS232 interface, USB interface, 100M Ethernet interface, analog audio interface, power interface, digital signal processing data interface and 485 bus interface.
The invention also comprises a man-machine interaction module; the man-machine interaction module is bidirectionally connected with the main controller and is used for inputting control commands and displaying output data; the preselector module, the frequency conversion processing module and the digital processing module are all controlled by the main controller, and data processed by the digital processing module is displayed through the man-machine interaction module after being processed by the main controller. The man-machine interaction module comprises a key module for inputting a control command and a display module for displaying output data; the key module is connected with the input end of the main controller, and the display module is connected with the output end of the main controller.
The invention also comprises a power supply module for providing stable and reliable direct current power supply for the test equipment.
Aiming at the secondary power supply in the test equipment, the power supply module adopts a switching power supply, so that the test equipment has high reliability and high efficiency and has necessary protection and control functions. The input voltage of the power supply module is 24V. The switching power supply mainly has the function of converting and isolating an external supply direct current power supply to generate working voltage required by equipment. The switching power supply has the input overvoltage protection function. The working principle is as follows: the 24V direct-current voltage of the external supply enters the power panel through an XS1 input socket, then passes through an input overvoltage protection circuit consisting of a self-recovery fuse F and a 600W transient voltage diode V and is sent to an input port of the switching power supply, the switching power supply generates isolated 24V direct-current output voltage, and the isolated 24V direct-current output voltage is used by a whole machine circuit after being filtered. The working principle of the input overvoltage protection circuit is as follows: when the external supply direct current voltage exceeds 32V, the transient voltage diode V is broken down to be in a short circuit state, and when the input current value exceeds the rated value of the self-recovery fuse F, the self-recovery fuse F is changed into a high-resistance state from the original conduction state, so that the input port of the switching power supply is protected. When the external supply direct current voltage is lower than 32V, the circuit automatically delays to recover the normal power supply state.
The invention adopts a modular design and is realized by using a general digital processing platform, a high-speed serial bus and a special radio frequency technology. In order to realize wide frequency range coverage, large dynamic range signal reception and reduce false response as far as possible, a receiving channel adopts the technologies of preselected amplification, high intermediate frequency and multiple intermediate frequency, and fixed intermediate frequency is obtained through three times of frequency conversion, so that the equipment has a larger linear dynamic range and very little false frequency response. By utilizing a general digital processing platform based on a software radio architecture and taking FPGA and DSP as digital processing cores, the functions of digital demodulation and measurement of modulation modes such as digital down conversion, decimation filtering, real-time FFT processing, AM, FM, CW, LSB and the like, AGC control with high precision and large dynamic range, real-time voice processing and the like are realized; the platform has openness, universality and expandability, and can meet the requirements of different users and different application environments by loading various application software.
The test equipment can monitor, identify, judge, predict and sense electromagnetic radiation and master the electromagnetic environment situation, provides basic data of a real-time battlefield electromagnetic environment and real-time working conditions of communication equipment for field maintenance guarantee in wartime and training, ensures real-time and efficient maintenance guarantee and training activities, and helps maintenance and guarantee personnel to take proper technical countermeasures and guarantee the safety of the maintenance and the training activities under various electromagnetic interference conditions. When a communication fault occurs, the test equipment can help a maintainer to quickly distinguish whether the communication equipment is interfered or has a fault, and the maintainer does not need to blindly check the equipment or replace a communication module, so that the communication guarantee maintenance is more targeted, namely, the guarantee cost of the communication equipment is reduced, and the equipment integrity rate and the combat communication level are also improved.
As shown in fig. 1, after receiving electromagnetic radiation in a space from an antenna of a testing device, a protection circuit is used to protect the device from large signals; the preselector module mainly adopts microwave devices such as a low-noise amplifier, a low-insertion-loss radio frequency switch, a low-insertion-loss filter and the like to selectively filter and amplify low noise of signals received from an antenna; the frequency conversion processing module mainly adopts devices such as a broadband high-linearity frequency mixer, a linear amplifier, a high-rectangular-coefficient intermediate frequency filter and the like, and mainly completes linear frequency conversion, selective filtering and linear amplification output of monitoring signals; the intermediate frequency signals after the third frequency conversion are sent to a digital processing module for digital sampling, AD conversion and digital down conversion, and frequency spectrum data and demodulation information are output after Fourier conversion and demodulation; the main controller adopts an ARM architecture and completes control and information interaction of the preselector module and the variable frequency processing module through the universal 485 bus controller.
The test equipment can complete monitoring, identification, judgment, prediction, perception and electromagnetic environment situation mastering of the electromagnetic radiation in the air through four functions of single-frequency measurement, digital scanning, frequency scanning and wireless networking monitoring, and the execution flow of each functional module is shown in attached figures 6-9.
(1) Single frequency measurement
A flow chart of the single frequency measurement function is shown in fig. 6. The signal stability analysis can adopt single-frequency measurement provided in the system, and the signal intensity of the signal source can be tested through the scanning mode, or the central frequency and the signal bandwidth of the signal source can be monitored by opening an index detection function.
(2) Digital scanning
A flow chart of the digital scanning function is shown in fig. 7. The system provides the following operation methods for monitoring the electromagnetic radiation environment of a battlefield during war and training: digital scanning. The digital scanning can arbitrarily set a start-stop frequency range in a frequency range, and reports real-time frequency spectrum data in the frequency range to an operator according to the selected scanning bandwidth, thereby providing support and guarantee for the operator to carry out field training activities.
(3) Frequency scanning
A flow chart of the frequency scanning function is shown in fig. 8. The frequency scanning is mainly used for monitoring concerned frequency sections, and operators set intervals among frequencies as required to realize quick and accurate signal searching. In the frequency scanning mode, upward and downward scanning is carried out according to the scanning mode and frequency steps between the starting frequency and the ending frequency, and the monitoring time of each frequency point is determined by preset residence time.
(4) Wireless networking monitoring
A flow chart of the wireless networking monitor function is shown in fig. 9. In order to effectively judge the robustness of the network and predict and diagnose the fault state of the network, the wireless networking monitoring method provided by the equipment comprises networking monitoring and frequency hopping analysis. The networking monitoring is mainly used for wireless network state evaluation and fault prediction of fixed frequency.
It will be apparent that numerous specific details are set forth in the above description to provide a thorough understanding of the present invention, but the invention may be embodied in other specific forms than described herein and may be similarly generalized by those skilled in the art without departing from the spirit of the invention and therefore not be limited to the specific embodiments disclosed above.
Claims (10)
1. The utility model provides a frequency spectrum monitoring and wireless network deployment test equipment which characterized in that: the device comprises an antenna, a preselector module, a frequency conversion processing module, a frequency synthesizer module, a digital processing module and a main controller; the main controller is respectively connected with the preselector module, the frequency conversion processing module and the digital processing module through buses; the antenna is connected with the preselector module, the preselector module is connected with the frequency conversion processing module, and the frequency conversion processing module is connected with the digital processing module; the antenna receives signals and sends the signals to the preselector module, and the preselector module performs selective filtering and amplification processing on the signals; the preselector module sends the signal subjected to selective filtering amplification to a frequency conversion processing module for frequency conversion processing to obtain an intermediate frequency signal, and the intermediate frequency signal is sent to a digital processing module for signal identification and measurement after being filtered and sent to the main controller after being subjected to FFT (fast Fourier transform); and the frequency synthesizer module is used for providing local oscillation signals for frequency mixing for the frequency conversion processing module.
2. The spectrum monitoring and wireless networking test device of claim 1, wherein: the main controller, the preselector module, the frequency conversion processing module and the digital processing module are all provided with bus controllers.
3. The spectrum monitoring and wireless networking test device of claim 1, wherein: the preselector module comprises a protection circuit and a switch filtering amplification circuit, wherein the protection circuit is used for large signal protection, and the switch filtering amplification circuit is used for selective filtering and low-noise amplification;
the switch filtering and amplifying circuit comprises a first four-to-one switch, four paths of first selection filtering and amplifying circuits and a second four-to-one switch; the output end of the antenna is connected with the common end of the first one-of-four switch through a protection circuit, and the four output ends of the first one-of-four switch are respectively connected with the four input ends of the second one-of-four switch through four first selective filtering and amplifying circuits; the four first selective filtering and amplifying circuits respectively complete filtering and amplifying of four frequency bands:
frequency band 1: 100 kHz-20 MHz;
frequency band 2: 20-1000 MHz;
frequency band 3: 1000-1500 MHz;
and frequency band 4: 1500-3600 MHz;
and the control ends of the first one-out-of-four switch and the second one-out-of-four switch are respectively connected with the main controller through buses.
4. The spectrum monitoring and wireless networking test device of claim 3, wherein: the first selective filtering and amplifying circuit corresponding to the frequency band 2 further comprises a third four-to-one switch, four paths of second selective filtering and amplifying circuits, a first two-to-one switch, a second two-to-one switch and a third two-to-one switch; each path of second selective filtering amplification circuit comprises a filter; one output end of the first four-out-of-one switch is connected with a common end of the third four-out-of-one switch, two output ends of the third four-out-of-one switch are respectively connected with two input ends of the first two-out-of-one switch through two paths of filters of the second selective filtering amplifying circuit, the other two output ends of the third four-out-of-one switch are respectively connected with two input ends of the second two-out-of-one switch through two paths of filters of the second selective filtering amplifying circuit, common ends of the first two-out-of-one switch and the second two-out-of-one switch are respectively connected with two input ends of the third two-out-of-one switch through an amplifier, and a common end of the third two-out-of-one switch is connected with one input end of the; the filters of the four paths of second selective filtering amplifying circuits respectively complete the filtering of four sub-frequency bands: 1) 20-70 MHz, 2) 70-200 MHz, 3) 200-560 MHz, 4) 560-1000 MHz; and the control ends of the third one-of-four switch and the first to third one-of-two switches are respectively connected with the main controller through buses.
5. The spectrum monitoring and wireless networking test device of claim 3, wherein: the first selective filtering and amplifying circuit corresponding to the frequency band 4 also comprises a fourth alternative switch, two paths of third selective filtering and amplifying circuits and a fifth alternative switch, and each path of third selective filtering and amplifying circuit comprises a filter; one output end of the first one-of-four switch is connected with a common end of the fourth one-of-four switch, two output ends of the fourth one-of-four switch are respectively connected with two input ends of the fifth one-of-four switch through two paths of filters of the third selective filtering and amplifying circuit, and the common end of the fifth one-of-four switch is connected with one input end of the second one-of-four switch through an amplifier; the two filters of the third selective filtering amplifying circuit respectively complete the filtering of two sub-frequency bands: 1) 1500-2300 MHz, 2) 2300-3600 MHz; and the control ends of the fourth and fifth alternative switches are respectively connected with the main controller through buses.
6. The spectrum monitoring and wireless networking test device of claim 1, wherein: the frequency conversion processing module comprises a first frequency conversion processing circuit, a second frequency conversion processing circuit, an intermediate frequency AGC circuit and a third frequency conversion processing circuit which are connected in sequence; each frequency conversion processing circuit comprises an amplifier, a mixer and a filter which are connected in sequence; the intermediate frequency AGC circuit consists of a wave detector and a digital attenuator; the three frequency conversion processing circuits sequentially carry out high-intermediate frequency and three-time frequency conversion processing on the signals subjected to selective filtering amplification, wherein the first intermediate frequency is 4329.7MHz, the second intermediate frequency is 229.7MHz, and the third intermediate frequency is 10.7MHz, and finally 10.7MHz intermediate frequency signals are obtained.
7. The spectrum monitoring and wireless networking test device of claim 6, wherein: the frequency synthesizer module comprises a first local oscillator, a second local oscillator and a third local oscillator, and local oscillator signals for frequency mixing are respectively provided for frequency mixers of the three frequency conversion processing circuits; the first local oscillator is composed of a DDS circuit, a filtering amplification circuit, a PLL phase-locked loop and a post-stage amplifier circuit, the second local oscillator is composed of an ADF4156, a loop filter, a VCO, an amplifier and a filter, and the third local oscillator is composed of the ADF4156, the loop filter, the VCO, a divide-by-two frequency divider, the amplifier and the filter.
8. The spectrum monitoring and wireless networking test device of claim 6, wherein: the digital processing module comprises a VGA module, an A/D conversion module, a DDC module, an FFT module and a demodulation module; the 10.7MHz intermediate frequency signal and the 10MHz reference signal enter the VGA module through the two-way switch, the VGA module, the A/D conversion module and the DDC module are sequentially connected, and the FFT module and the demodulation module are both connected with the DDC module.
9. The spectrum monitoring and wireless networking test device of claim 1, wherein: the main controller comprises a processor, a function panel, an audio frequency and an interface; the function panel, the audio and the interface are connected with the processor.
10. The spectrum monitoring and wireless networking test device of claim 1, wherein: the test equipment also comprises a power supply module and a human-computer interaction module; the power supply module provides a direct current power supply for the test equipment; the man-machine interaction module comprises a key module for inputting a control command and a display module for displaying output data; the key module is connected with the input end of the main controller, and the display module is connected with the output end of the main controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010499910.4A CN111614414A (en) | 2020-06-04 | 2020-06-04 | Spectrum monitoring and wireless networking test equipment |
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| CN202010499910.4A CN111614414A (en) | 2020-06-04 | 2020-06-04 | Spectrum monitoring and wireless networking test equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115792376A (en) * | 2023-02-09 | 2023-03-14 | 成都九洲迪飞科技有限责任公司 | Broadband spectrum monitoring system and method |
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