CN211127816U - Multichannel real-time spectrum analysis device and system - Google Patents
Multichannel real-time spectrum analysis device and system Download PDFInfo
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- CN211127816U CN211127816U CN202020254454.2U CN202020254454U CN211127816U CN 211127816 U CN211127816 U CN 211127816U CN 202020254454 U CN202020254454 U CN 202020254454U CN 211127816 U CN211127816 U CN 211127816U
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Abstract
The utility model provides a real-time spectrum analysis device of multichannel and system, include: the electromagnetic field probe and the host computer, the host computer includes a plurality of radio frequency modules, digital processing modules, upper computers and touchable display screens that are parallel; the radio frequency module is used for receiving a radio frequency signal sent by the electromagnetic field probe, performing down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal, and performing analog-to-digital conversion on the intermediate frequency analog signal to obtain a digital signal; the digital processing module is used for carrying out down-conversion on the digital signal to obtain a frequency spectrum moving signal, carrying out orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal, and carrying out filtering and short-time Fourier transform on the sine wave analog signal to obtain a frequency spectrum data result; generating a frequency spectrum curve according to the frequency spectrum data result; the touchable display screen is used for displaying a spectrum curve, a plurality of parallel radio frequency channels can be adopted, signals in a plurality of spatial directions are received, and accuracy of a spectrum data result is ensured.
Description
Technical Field
The utility model belongs to the technical field of the signal processing technique and specifically relates to relate to multichannel real-time spectrum analysis device and system.
Background
Currently, spectrum analyzers are applicable to electromagnetic pulse testing, electromagnetic interference testing, communication testing, and other radio frequency signal testing.
The real-time frequency spectrograph can ensure the continuity of time in the testing process. However, for the test of the spatial electromagnetic field, the real-time spectrometer usually has only one receiving device, which is a radio frequency signal receiving channel, and the channel cannot receive signals in multiple spatial directions, thereby causing inaccurate results of the spectral data.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a multi-channel real-time spectrum analysis device and system, which can adopt a plurality of parallel rf channels to receive signals from a plurality of directions in space, thereby ensuring the accuracy of the spectrum data result.
In a first aspect, an embodiment of the present invention provides a multi-channel real-time spectrum analysis device, which includes an electromagnetic field probe and a host, where the host includes a plurality of parallel radio frequency modules, a digital processing module, an upper computer, and a touch display screen;
the electromagnetic field probe is connected with the plurality of parallel radio frequency modules, the plurality of parallel radio frequency modules are all connected with the digital processing module, the digital processing module is connected with the upper computer, and the upper computer is connected with the touchable display screen;
the radio frequency module is used for receiving a radio frequency signal sent by the electromagnetic field probe, performing down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal, and performing analog-to-digital conversion on the intermediate frequency analog signal to obtain a digital signal;
the digital processing module is used for carrying out down-conversion on the digital signal to obtain a frequency spectrum moving signal, carrying out orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal, and carrying out filtering and short-time Fourier transform on the sine wave analog signal to obtain a frequency spectrum data result; generating a frequency spectrum curve according to the frequency spectrum data result;
the touchable display screen is used for displaying the frequency spectrum curve.
In a second aspect, embodiments of the present invention provide a multi-channel real-time spectrum analysis system, including a multi-channel real-time spectrum analysis apparatus as described above.
The embodiment of the utility model provides a multichannel real-time spectrum analysis device and system, including electromagnetic field probe and host computer, the host computer includes a plurality of radio frequency module, digital processing module, host computer and tangible display screen that are parallel; the plurality of parallel radio frequency modules are connected with the digital processing module, the digital processing module is connected with an upper computer, and the upper computer is connected with the touchable display screen; the radio frequency module is used for receiving a radio frequency signal sent by the electromagnetic field probe, performing down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal, and performing analog-to-digital conversion on the intermediate frequency analog signal to obtain a digital signal; the digital processing module is used for carrying out down-conversion on the digital signal to obtain a frequency spectrum moving signal, carrying out orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal, and carrying out filtering and short-time Fourier transform on the sine wave analog signal to obtain a frequency spectrum data result; generating a frequency spectrum curve according to the frequency spectrum data result; the touchable display screen is used for displaying a spectrum curve, a plurality of parallel radio frequency channels can be adopted, signals in a plurality of spatial directions are received, and accuracy of a spectrum data result is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a multi-channel real-time spectrum analysis apparatus according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a host according to a first embodiment of the present invention;
fig. 3 is a schematic view of an electromagnetic field probe according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electromagnetic field probe according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a plurality of rf channels according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a radio frequency channel according to an embodiment of the present invention;
fig. 7 is a flowchart of a multi-channel real-time spectrum analysis method according to the second embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Currently, spectrum analyzers are applicable to electromagnetic pulse testing, electromagnetic interference testing, communication testing, and other radio frequency signal testing.
Conventional spectrum analyzers perform spectrum measurements by scanning a local oscillator, mixing the input signal to a fixed intermediate frequency. The signal is mixed in several stages and finally passed through an analog resolution filter which determines the frequency resolution. The measurement time is determined by two factors, namely the setting time of the resolution filter and the time (re-trace time) for the first local oscillator to return from the termination frequency to the starting frequency.
The second generation spectrum analyzer adopts an FFT (Fast Fourier Transform) filter instead of an analog resolution filter when the bandwidth is narrow. A plurality of narrow band FFT filters represent one trace within a selected frequency span by stitching. Since the time for calculating the FFT is shorter than the setting time of the narrowband RBW (intermediate frequency filter) for the narrowband RBW, this method has a great advantage in processing speed compared with the frequency sweeping method of the conventional spectrum analyzer.
The above method cannot measure the signal generated from the end point of the sweep to the start point of the next sweep, and the gap of data acquisition is called "dead time".
The currently adopted real-time frequency spectrograph can make up for the defects of the method, so that dead time is avoided, and the continuity of time can be ensured in the testing process. However, for the test of the spatial electromagnetic field, there is usually only one receiving device, which is a radio frequency signal receiving channel, and the channel cannot receive signals in multiple spatial directions, thereby causing inaccurate results of the spectral data.
To facilitate understanding of the present embodiment, the following detailed description will be given of embodiments of the present invention.
The first embodiment is as follows:
fig. 1 is a schematic view of a multi-channel real-time spectrum analysis apparatus according to an embodiment of the present invention.
Referring to fig. 1, the apparatus includes an electromagnetic field probe and a main unit. Referring to fig. 2, the host comprises a plurality of parallel radio frequency modules, a digital processing module, an upper computer and a touchable display screen;
the electromagnetic field probe is connected with the plurality of parallel radio frequency modules, the plurality of parallel radio frequency modules are all connected with the digital processing module, the digital processing module is connected with an upper computer, and the upper computer is connected with the touchable display screen;
here, the plurality of parallel rf modules have corresponding rf channels, each rf channel has the same rf performance and signal processing capability, and the digital processing of each rf channel is also parallel, i.e. each rf channel can work independently and the time of data processing is synchronized.
The radio frequency module is used for receiving a radio frequency signal sent by the electromagnetic field probe, performing down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal, and performing analog-to-digital conversion on the intermediate frequency analog signal to obtain a digital signal;
here, the rf module may receive the rf signal transmitted by the electromagnetic field probe, and since the signal interface of the rf module is an N-type connector, the rf module may also receive the signal in other manners, for example, the signal generator transmits the rf signal to the rf module through the rf cable, thereby completing the test of the output signal of the signal generator.
The digital processing module is used for performing down-conversion on the digital signal to obtain a frequency spectrum moving signal, performing orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal, and performing filtering and Short Time Fourier Transform (STFT) on the sine wave analog signal to obtain a frequency spectrum data result; generating a frequency spectrum curve according to the frequency spectrum data result;
and the touchable display screen is used for displaying the frequency spectrum curve.
Here, the host further includes an I/Q storage module for storing the spectrum data result and exporting it via USB (Universal Serial Bus). The host machine further comprises a first N-type joint, a second N-type joint and a third N-type joint, wherein the first N-type joint, the second N-type joint and the third N-type joint are input ports of radio-frequency signals. When the electromagnetic field probe is used in combination, the first N-type joint is connected with the first SMA joint through the extension line, the second N-type joint is connected with the second SMA joint through the extension line, and the third N-type joint is connected with the third SMA joint through the extension line. In addition, a second multi-core aviation plug of the host is connected with the first multi-core aviation plug of the electromagnetic field probe through an extension line.
In this embodiment, the host further includes an upper computer, and the upper computer is configured to receive the spectrum data result sent by the digital processing module, and cache the spectrum data result, because the data volume sent by the digital processing module is large, and cannot be processed all at once. The upper computer can also draw a spectrum curve, display the spectrum curve and store, export or playback the spectrum curve or the spectrum data result. The upper computer can also clear the processed spectrum data after the spectrum data result is processed.
Further, the plurality of parallel radio frequency modules include a first radio frequency module, a second radio frequency module and a third radio frequency module, wherein the first radio frequency module corresponds to the first radio frequency channel, the second radio frequency module corresponds to the second radio frequency channel, and the third radio frequency module corresponds to the third radio frequency channel.
Further, the frequency spectrum data result comprises a frequency spectrum data result of a first radio frequency channel, a frequency spectrum data result of a second radio frequency channel and a frequency spectrum data result of a third radio frequency channel, wherein the frequency spectrum data result of the first radio frequency channel, the frequency spectrum data result of the second radio frequency channel and the frequency spectrum data result of the third radio frequency channel comprise a plurality of frequency points, and each frequency point corresponds to a corresponding voltage value;
and the digital processing module is used for respectively selecting a plurality of voltage values of the same frequency point from the frequency spectrum data result of the first radio frequency channel, the frequency spectrum data result of the second radio frequency channel and the frequency spectrum data result of the third radio frequency channel, calculating the plurality of voltage values of the same frequency point to obtain a comprehensive voltage value of the same frequency point, and repeatedly executing the processing until each same frequency point is traversed.
Specifically, a plurality of voltage values of the same frequency point are respectively selected from the frequency spectrum data result of the first radio frequency channel, the frequency spectrum data result of the second radio frequency channel and the frequency spectrum data result of the third radio frequency channel, and the formula (1) is adopted for calculation to obtain a comprehensive voltage value of the frequency point, at this time, the voltage value of the next same frequency point is obtained, then the formula (1) is adopted for calculation to obtain the voltage value of the next same frequency point, the processing is repeatedly executed until each same frequency point is traversed, at this time, a plurality of comprehensive voltage values are obtained, and then a frequency spectrum curve is drawn by using the plurality of comprehensive voltage values. Table 1 shows a plurality of voltage values corresponding to the same frequency point, specifically referring to table 1:
wherein, the same frequency points are 100kHz, 200kHz and 300kHz, the voltage corresponding to the x-axis, the voltage corresponding to the y-axis and the voltage corresponding to the z-axis can refer to the table 1, and the comprehensive voltage value can be obtained by calculation according to the formula (1), and specifically refer to the table 2:
when the same frequency point is 100kHz, the corresponding comprehensive voltage value is 0.27V; when the same frequency point is 200kHz, the corresponding comprehensive voltage value is 0.3V; when the same frequency point is 300kHz, the corresponding comprehensive voltage value is 0.23V.
Further, the digital processing module is specifically configured to:
calculating the comprehensive voltage value of the same frequency point according to the formula (1):
wherein, V is the integrated voltage value of the same frequency point, X is the voltage value of the same frequency point selected from the frequency spectrum data result of the first radio frequency channel, Y is the voltage value of the same frequency point selected from the frequency spectrum data result of the second radio frequency channel, and Z is the voltage value of the same frequency point selected from the frequency spectrum data result of the third radio frequency channel.
Further, the digital processing module comprises a single chip microcomputer and a power management module;
the singlechip is connected with the power management module and used for receiving control instruction information sent by the upper computer;
and the power supply management module is respectively connected with the plurality of parallel radio frequency modules and is used for controlling the power supply switches of the radio frequency channels corresponding to the plurality of parallel radio frequency modules according to the control instruction information sent by the single chip microcomputer.
Further, the control instruction information includes opening instruction information or closing instruction information;
the power supply management module is used for starting power supply switches of the radio frequency channels corresponding to the plurality of parallel radio frequency modules in a mode of pulling up the electrical level according to the starting instruction information;
alternatively, the first and second electrodes may be,
and closing the power switches of the radio frequency channels corresponding to the plurality of parallel radio frequency modules in a pull-down level mode according to the closing instruction information.
Further, referring to fig. 3, the electromagnetic field probe includes a first multicore aviation plug, a first low noise amplifier, a second low noise amplifier, a third low noise amplifier, a first antenna, a second antenna, and a third antenna, wherein the first low noise amplifier is connected to the first antenna, the second low noise amplifier is connected to the second antenna, and the third low noise amplifier is connected to the third antenna;
the host comprises a second multi-core aviation plug, wherein the first multi-core aviation plug is connected with the second multi-core aviation plug; the singlechip is connected with the second multi-core aviation plug through the radio frequency module.
Specifically, the electromagnetic field probe is a triaxial parallel omnidirectional broadband active probe, and a first noise amplifier, a second noise amplifier and a third noise amplifier are built in the probe, three axial directions of a first antenna, a second antenna and a third antenna which respectively correspond to each other are orthogonal to each other, and radio frequency signals in x, y and z directions of a space are respectively tested, wherein each axial direction comprises an antenna and a low noise amplifier, for example, a radio frequency signal received in the x direction comprises the first antenna and the first low noise amplifier, a radio frequency signal received in the y direction comprises the second antenna and the second low noise amplifier, and a radio frequency signal received in the z direction comprises the third antenna and the third low noise amplifier.
Furthermore, the electromagnetic field probe also comprises a coaxial shielding cable, a shielding dual-core cable, a first SMA joint, a second SMA joint and a third SMA joint, wherein the first low-noise amplifier is connected with the first SMA joint through the coaxial shielding cable, the second low-noise amplifier is connected with the second SMA joint through the coaxial shielding cable, and the third low-noise amplifier is connected with the third SMA joint through the coaxial shielding cable; the first low-noise amplifier, the second low-noise amplifier and the third low-noise amplifier are all connected with the first multi-core aviation plug through shielded double-core cables.
Specifically, referring to fig. 4, the electromagnetic field probe includes a body, a first SMA joint, a second SMA joint and a third SMA joint are provided at the bottom of the body, and a first multicore aviation plug is provided at one side of the body.
Further, the singlechip is used for controlling one or more low noise amplifiers of the first low noise amplifier, the second low noise amplifier and the third low noise amplifier to work in a mode of pulling up the electrical level according to the opening axial instruction information input by the user;
alternatively, the first and second electrodes may be,
and controlling one or more low noise amplifiers of the first low noise amplifier, the second low noise amplifier and the third low noise amplifier to stop working in a pull-down level mode according to the closing axial direction instruction information input by a user.
Specifically, the digital processing module comprises a single chip microcomputer, the single chip microcomputer comprises three pins which are a pin 1, a pin 2 and a pin 3 respectively, the pin 1, the pin 2 and the pin 3 are connected with an enabling pin of a low noise amplifier in the electromagnetic field probe through a second multi-core aviation plug, namely the pin 1 is connected with the enabling pin of a first low noise amplifier, the pin 2 is connected with the enabling pin of a second low noise amplifier, and the pin 3 is connected with the enabling pin of a third low noise amplifier. When a user inputs opening instruction information of an x-axis direction on an interface of the host, the single chip microcomputer pulls up the level of an enabling pin of a first low-noise amplifier connected with the x-axis direction, and therefore the x-axis of the electromagnetic field probe starts to work.
When the host is used independently, one or more channels are optionally opened by the first radio frequency channel, the second radio frequency channel and the third radio frequency channel, and the opened radio frequency channels can be used as independent real-time frequency spectrometers.
When a plurality of radio frequency channels are selected, the touchable display screen in the host displays the frequency spectrum data result of the selected radio frequency channels at the same time, namely when the first radio frequency channel, the second radio frequency channel and the third radio frequency channel are opened, the displayed frequency spectrum data result is as shown in fig. 5. When the second rf channel and the third rf channel are closed and the first rf channel is opened, the displayed spectrum data result is as shown in fig. 6.
The three radio frequency channels have the same radio frequency performance and signal processing capacity, and the same test result can be obtained when the same target signal is tested. When the same target signal is tested, the three radio frequency channels can obtain the same sampling data, and based on the same sampling data, the digital processing module can perform real-time spectrum processing of different frequency bands on the same sampling data. Wherein, each radio frequency channel has a maximum real-time bandwidth of 100MHz, and the digital processing module can perform real-time spectrum processing on three different frequency ranges. The upper computer can flexibly distribute and display the bandwidth according to the setting of the user. For example, a user needs to observe frequency spectrum information of 100MHz-200MHz, 500MHz-600MHz and 900MHz-1GHz of the same target signal in real time, and the work can be completed only by 3 frequency spectrum analysis devices with 100MHz real-time bandwidth, and the device can be completed independently by using three radio frequency channels.
The enhancement mode may be enabled when the user requires a maximum real-time bandwidth for the real-time bandwidth that is greater than 100MHz for a single channel. The upper computer splices the real-time bandwidths of the three parallel radio frequency channels into a continuous test bandwidth, and the real-time bandwidth is increased from 100MHz to 300 MHz. For example, when a user needs to perform real-time spectrum testing on signals with the central frequencies of 1GHz and 300MHz, the device can splice (splice) the real-time bandwidths of three radio frequency channels into different frequency signals, namely, a first radio frequency channel tests 850MHz-950MHz, a second radio frequency channel tests 950MHz-1050MHz, a third radio frequency channel tests 1050MHz-1150MHz, and the upper computer splices real-time spectrum data results uploaded by the three radio frequency channels and draws a spectrum curve of 850MHz-1150 MHz.
When the attenuator value is constant, the dynamic range of the radio frequency channel is fixed and small. When electromagnetic field signals with large signals and small signals existing simultaneously are tested, part of signals are restricted by dynamic range and cannot be tested. Some signals appear frequently and have short duration, and in order to improve the efficiency of test work, the whole signal needs to be captured at one time.
In order to solve the problem of limited dynamic range, a dynamic range increasing mode is designed based on the characteristic that three radio frequency channels have the same radio frequency performance and signal processing capacity, the three radio frequency channels are set to be different attenuation values, and a frequency spectrum data result is spliced on a Y axis (amplitude axis) of a frequency spectrum curve, so that the dynamic range can be expanded, large and small signals can be captured simultaneously, and any information of the signals cannot be missed. For example, when the attenuator is set to 0dB, signals of-100 dBm through-20 dBm can be tested; when the attenuator is-10 dBm, the attenuator can test-90 dBm to-10 dBm; when the attenuator is-20 dB, -80 dBm-0 dBm can be tested. When the dynamic range enhancement mode is started, the first radio frequency channel attenuator is 0dB, the second radio frequency channel attenuator is-10 dBm, the third radio frequency channel attenuator is-20 dBm, the Y-axis result is spliced, and the dynamic range can be expanded to-100 dBm-0 dBm.
The electromagnetic field testing method based on the electromagnetic field comprises the steps that electromagnetic signal receiving capacity of an electromagnetic field probe in three directions of space x, y and z is achieved, three radio frequency channels of a host have parallel radio frequency testing capacity, electromagnetic field signals in the three directions of space x, y and z can be collected without gaps in a period of time, after digitization is conducted, on one hand, frequency spectrum processing is conducted on data, on the other hand, digital signals are converted into sine wave analog signals and stored according to channel serial numbers, and therefore the problems of isotropy of electromagnetic signal collection in a testing period and synchronization of signal collection time in each direction are solved. The stored sine wave analog signal can be led out through the USB equipment and input to the vector signal source, and the electromagnetic field signal is played through the antenna.
A multi-channel real-time spectral analysis system comprising a multi-channel real-time spectral analysis apparatus as described above.
The embodiment of the utility model provides a multichannel real-time spectrum analysis device and system, include: the electromagnetic field probe and the host computer, the host computer includes a plurality of radio frequency modules, digital processing modules, upper computers and touchable display screens that are parallel; the plurality of parallel radio frequency modules are connected with the digital processing module, the digital processing module is connected with an upper computer, and the upper computer is connected with the touchable display screen; the radio frequency module is used for receiving a radio frequency signal sent by the electromagnetic field probe, performing down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal, and performing analog-to-digital conversion on the intermediate frequency analog signal to obtain a digital signal; the digital processing module is used for carrying out down-conversion on the digital signal to obtain a frequency spectrum moving signal, carrying out orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal, and carrying out filtering and short-time Fourier transform on the sine wave analog signal to obtain a frequency spectrum data result; generating a frequency spectrum curve according to the frequency spectrum data result; the touchable display screen is used for displaying a spectrum curve, a plurality of parallel radio frequency channels can be adopted, signals in a plurality of spatial directions are received, and accuracy of a spectrum data result is ensured.
Example two:
fig. 7 is a flowchart of a multi-channel real-time spectrum analysis method according to the second embodiment of the present invention.
Referring to fig. 7, the above multi-channel real-time spectrum analysis apparatus is applied, and the method includes the following steps:
step S101, receiving a radio frequency signal sent by an electromagnetic field probe;
step S102, carrying out down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal;
step S103, performing analog-to-digital conversion on the intermediate-frequency analog signal to obtain a digital signal;
step S104, carrying out down-conversion on the digital signal to obtain a frequency spectrum shifting signal;
step S105, carrying out orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal;
step S106, filtering and short-time Fourier transform are carried out on the sine wave analog signal to obtain a frequency spectrum data result;
step S107, generating a frequency spectrum curve according to the frequency spectrum data result;
step S108, displaying the spectrum curve.
The embodiment of the utility model provides a multichannel real-time spectrum analysis method, include: receiving a radio frequency signal sent by an electromagnetic field probe; carrying out down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal; performing analog-to-digital conversion on the intermediate-frequency analog signal to obtain a digital signal; carrying out down-conversion on the digital signal to obtain a frequency spectrum shifting signal; carrying out orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal; filtering and short-time Fourier transform are carried out on the sine wave analog signal to obtain a frequency spectrum data result; generating a frequency spectrum curve according to the frequency spectrum data result; the frequency spectrum curve is displayed, a plurality of parallel radio frequency channels can be adopted, signals in a plurality of spatial directions are received, and accuracy of a frequency spectrum data result is ensured.
The embodiment of the utility model provides an electronic equipment is still provided, including memory, treater and the computer program that stores on the memory and can run on the treater, realize the step of the multichannel real-time spectrum analysis method that above-mentioned embodiment provided when the treater carries out computer program.
The embodiment of the present invention further provides a computer readable medium having a non-volatile program code executable by a processor, where the computer readable medium has a computer program stored thereon, and the computer program executes the steps of the multi-channel real-time spectrum analysis method according to the above-mentioned embodiment when being executed by the processor.
The embodiment of the present invention provides a computer program product, which includes a computer readable storage medium storing a program code, wherein the instruction included in the program code can be used to execute the method described in the foregoing method embodiment, and the specific implementation can refer to the method embodiment, which is not described herein again.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A multi-channel real-time frequency spectrum analysis device is characterized by comprising an electromagnetic field probe and a host, wherein the host comprises a plurality of parallel radio frequency modules, a digital processing module, an upper computer and a touch display screen;
the electromagnetic field probe is connected with the plurality of parallel radio frequency modules, the plurality of parallel radio frequency modules are all connected with the digital processing module, the digital processing module is connected with the upper computer, and the upper computer is connected with the touchable display screen;
the radio frequency module is used for receiving a radio frequency signal sent by the electromagnetic field probe, performing down-conversion on the radio frequency signal to obtain an intermediate frequency analog signal, and performing analog-to-digital conversion on the intermediate frequency analog signal to obtain a digital signal;
the digital processing module is used for carrying out down-conversion on the digital signal to obtain a frequency spectrum moving signal, carrying out orthogonal decomposition on the frequency spectrum moving signal to obtain a sine wave analog signal, and carrying out filtering and short-time Fourier transform on the sine wave analog signal to obtain a frequency spectrum data result; generating a frequency spectrum curve according to the frequency spectrum data result;
the touchable display screen is used for displaying the frequency spectrum curve.
2. The multi-channel real-time spectrum analysis device of claim 1, wherein the plurality of parallel rf modules comprises a first rf module, a second rf module, and a third rf module, wherein the first rf module corresponds to a first rf channel, the second rf module corresponds to a second rf channel, and the third rf module corresponds to a third rf channel.
3. The multi-channel real-time spectrum analysis device according to claim 2, wherein the spectrum data result comprises a spectrum data result of the first rf channel, a spectrum data result of the second rf channel, and a spectrum data result of the third rf channel, wherein the spectrum data result of the first rf channel, the spectrum data result of the second rf channel, and the spectrum data result of the third rf channel each comprise a plurality of frequency points, and each frequency point corresponds to a corresponding voltage value;
the digital processing module is configured to select a plurality of voltage values of a same frequency point from a spectrum data result of a first radio frequency channel, a spectrum data result of a second radio frequency channel, and a spectrum data result of a third radio frequency channel, calculate the plurality of voltage values of the same frequency point to obtain a comprehensive voltage value of the same frequency point, and repeatedly execute the above processing until each same frequency point is traversed.
4. The multi-channel real-time spectrum analysis device of claim 2, wherein the digital processing module comprises a single chip microcomputer and a power management module;
the single chip microcomputer is connected with the power management module and used for receiving control instruction information sent by an upper computer;
the power management module is respectively connected with the plurality of parallel radio frequency modules and used for controlling the power switches of the radio frequency channels corresponding to the plurality of parallel radio frequency modules according to the control instruction information sent by the single chip microcomputer.
5. The multi-channel real-time spectrum analysis device of claim 4, wherein the control command information comprises turn-on command information or turn-off command information;
the power supply management module is used for starting power switches of the radio frequency channels corresponding to the plurality of parallel radio frequency modules in a mode of pulling up the electrical level according to the starting instruction information;
alternatively, the first and second electrodes may be,
and closing the power switches of the radio frequency channels corresponding to the plurality of parallel radio frequency modules in a low level pulling mode according to the closing instruction information.
6. The multi-channel real-time spectrum analysis device of claim 4, wherein the electromagnetic field probe comprises a first multi-core aviation plug, a first low noise amplifier, a second low noise amplifier, a third low noise amplifier, a first antenna, a second antenna, and a third antenna, wherein the first low noise amplifier is connected to the first antenna, the second low noise amplifier is connected to the second antenna, and the third low noise amplifier is connected to the third antenna;
the host comprises a second multi-core aviation plug, wherein the first multi-core aviation plug is connected with the second multi-core aviation plug; the single chip microcomputer is connected with the second multi-core aviation plug through the radio frequency module.
7. The multi-channel real-time spectrum analysis device according to claim 6, wherein the single chip microcomputer is configured to control one or more low noise amplifiers among the first low noise amplifier, the second low noise amplifier and the third low noise amplifier to operate in a pull-up level manner according to an on-axis instruction information input by a user;
alternatively, the first and second electrodes may be,
and controlling one or more low noise amplifiers in the first low noise amplifier, the second low noise amplifier and the third low noise amplifier to stop working in a mode of pulling down the level according to the axial closing instruction information input by the user.
8. The multi-channel real-time spectrum analysis device of claim 7, wherein the electromagnetic field probe further comprises a coaxial shielded cable, a first SMA connector, a second SMA connector, and a third SMA connector, wherein the first low noise amplifier is connected to the first SMA connector through the coaxial shielded cable, the second low noise amplifier is connected to the second SMA connector through the coaxial shielded cable, and the third low noise amplifier is connected to the third SMA connector through the coaxial shielded cable.
9. The multi-channel real-time spectrum analysis device of claim 8, wherein the electromagnetic field probe further comprises a shielded dual-core cable, and the first low noise amplifier, the second low noise amplifier, and the third low noise amplifier are all connected to the first multi-core aviation plug through the shielded dual-core cable.
10. A multi-channel real-time spectrum analysis system comprising the multi-channel real-time spectrum analysis apparatus of any one of claims 1 to 9.
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