CN115529092A - Movable monitoring direction-finding system - Google Patents
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Abstract
An embodiment of the present specification provides a movable monitoring direction-finding system, including: the direction-finding antenna elements, the matrix switch, the radio frequency module, the intermediate frequency module and the industrial personal computer are sequentially communicated and connected with each other; the direction-finding antenna element is used for collecting a radio signal to be detected in space; the matrix switch is used for amplifying and switching the acquired radio signal to be detected to obtain a processed radio signal; the radio frequency module is used for carrying out at least one of filtering processing, amplifying processing and down-conversion processing on the received radio antenna element signals to obtain intermediate frequency signals; the intermediate frequency module is used for carrying out AD data acquisition and processing on the intermediate frequency signals to obtain the amplitude and phase difference of the intermediate frequency signals corresponding to the two paths of radio antenna element signals; and transmitting the amplitude and the phase difference to an industrial personal computer; the industrial personal computer is used for carrying out interferometer calculation on the amplitude and the phase difference to obtain the incoming wave direction of the radio signal to be detected.
Description
Technical Field
The specification relates to the field of radio monitoring, in particular to a movable monitoring direction-finding system.
Background
The radio signal management is the main work of the radio management department, and the common devices comprise a mobile monitoring vehicle and a fixedly-arranged monitoring station. However, in some major event security, it is necessary to temporarily mount a monitoring and direction-finding system in the venue. Some sudden interference signal monitoring needs to be carried out in areas which are not suitable for vehicles to enter and are in fixed station monitoring blind areas, such as mountaintops, downtown areas and the like, and under the conditions, the moving type monitoring direction-finding equipment which is flexible in movement and convenient to erect is needed.
At present, monitoring direction-finding equipment on the market has the problems of inconvenient movement, complex operation and incapability of simultaneously monitoring and direction-finding, so that the applicable scenes are few, and the working efficiency is low.
Can move equipment or weight is very heavy, the transport difficulty, or need extend the antenna during in-service use, need fold again after the use is accomplished, some antennas are not integrative with the receiver part, still need connect many cables, the operation is complicated, the time spent, some move the station volume less, but because the restriction in aperture, the index is very poor, can't satisfy customer user demand, move the station in order to reduce the volume a bit, the monitoring is realized through direction finding antenna element, lead to monitoring and unable simultaneous implementation of direction finding, and the work efficiency is reduced. There is a need for a portable direction-finding monitoring system that meets the broadband direction-finding criteria and is convenient to carry.
Disclosure of Invention
One or more embodiments of the present description provide a portable monitoring direction-finding system, comprising: the direction-finding antenna elements, the matrix switch, the radio frequency module, the intermediate frequency module and the industrial personal computer are sequentially in communication connection with one another; the direction-finding antenna element is used for collecting a radio signal to be detected in space and transmitting the collected radio signal to be detected to the matrix switch; the matrix switch is used for amplifying and switching the acquired radio signal to be detected to obtain a processed radio signal, and transmitting the processed radio signal to the radio frequency module in a mode of transmitting two paths of radio antenna element signals each time; the radio frequency module is used for performing at least one of filtering processing, amplifying processing and down-conversion processing on the received radio antenna element signal to obtain an intermediate frequency signal, and transmitting the intermediate frequency signal to the intermediate frequency module; the intermediate frequency module is used for carrying out AD data acquisition and processing on the intermediate frequency signals to obtain the amplitude and phase difference of the intermediate frequency signals corresponding to the two paths of radio antenna element signals; transmitting the amplitude and the phase difference to the industrial personal computer; and the industrial personal computer is used for carrying out interferometer calculation on the amplitude and the phase difference to obtain the incoming wave direction of the radio signal to be detected.
In some embodiments, two layers of antenna elements are selected for the direction-finding antenna element to cover the radio signal to be measured, and the frequency of the radio signal to be measured is 20MHz-8GHz.
In some embodiments, the two-tier antenna elements comprise a low-band direction-finding antenna element that is an active dipole antenna and a high-band direction-finding antenna element that is a deformed log-periodic antenna.
In some embodiments, the intermediate frequency signal has a frequency of 70MHz.
In some embodiments, the low-band direction finding of the two layers of antenna elements is realized based on five-element direction finding, the frequency range of the low band is 20MHz-1GHz, the high-band direction finding of the two layers of antenna elements is realized based on nine-element direction finding, and the frequency range of the high band is 1GHz-8GHz.
In some embodiments, the direction-finding antenna element comprises a dual-channel receiver, and at least one of nine antenna elements corresponding to the nine-element direction finding is correspondingly connected with an input end of a first channel of the dual-channel receiver.
In some embodiments, the matrix switch is a single-pole 8-throw rf switch, and 8 of the nine antenna elements are sequentially connected to the input end of the second channel of the dual-channel receiver in a time-sharing manner.
In some embodiments, the interferometric calculation comprises: calculating a first phase difference, a second phase difference and a third phase difference; calculating theoretical sample points; determining an actually measured sample point; calculating the similarity between the theoretical sample point and the measured sample point; and determining the incoming wave direction of the radio signal to be detected.
In some embodiments, the interferometric calculation comprises:
if the nine antenna elements corresponding to the nine direction finding are A respectively 0 ～A 8 The nine antenna elements are uniformly distributed on a circumference with a radius of R according to angles, and the antenna element A 0 At the north orientation of the central point of the circle, the antenna element A 0 Is a reference antenna element; the reference antenna element is correspondingly connected with the input end of a first channel of the dual-channel receiver; the antenna element A 1 ～A 8 The input end of the second channel of the double-channel receiver is sequentially connected with the input end of the second channel in a corresponding time-sharing manner;
if the azimuth angle of the incoming wave corresponding to the radio signal to be detected is alpha and the elevation angle is theta, the nine antenna elements A 0 ～A 8 The phase difference of the induced voltage on the antenna element relative to the induced voltage of the virtual antenna element positioned at the central point of the circumference is respectively as follows:
wherein i =0, 1,2, \ 8230, 8; λ is the wavelength of the incoming wave;
antenna element A 1 ～A 8 Induced voltage on with respect to the antenna element a 0 The phase difference of the induced voltage is as follows:
wherein m =1,2, \8230, 8;
phi if theta =0 1 ～φ 8 Are respectively recorded as phi 01 ～Φ 08 Then:
let the theoretical sample point (phi) 01 ，Φ 02 ，…，Φ 08 ) = e, and e is composed of eight ordered variables Φ 01 ～Φ 08 Characterizing;
if the azimuth angle α changes in steps of 1 ° from 0 °,360 theoretical sample points can be calculated from equation (3):
e i ＝(Φ 01n ，Φ 02n ，…，Φ 08n )，n＝1，2，…，360；
sequentially and alternately arranging the antenna elements A based on the radio frequency switch 1 ～A 8 Connected to the input end of the second channel of the dual-channel receiver, and measuring the antenna element A 1 ～A 8 Induced voltage on with respect to said antenna element a 0 Are respectively phi 'in phase difference' 01 ，φ′ 02 ，…，φ′ 08 ；
Let measured sample point e '= (φ' 01 ，φ′ 02 ，…，φ′ 08 )；
E' and e i (i =1,2, \8230;, 360) performing similarity calculation, and determining a theoretical sample point with the highest similarity to the actually measured sample point e' as a reference point;
and taking the azimuth angle corresponding to the reference point as the incoming wave direction of the radio signal to be detected.
In some embodiments, the similarity is expressed based on vector distance, the smaller the vector distance, the higher the similarity.
In some embodiments, the vector distance is a hamming distance.
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The present description will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not intended to be limiting, and in these embodiments like numerals are used to indicate like structures, wherein:
FIG. 1 is a schematic diagram of an application scenario of a portable monitoring direction-finding system according to some embodiments of the present description;
FIG. 2 is a block diagram of an exemplary configuration of a portable monitoring direction-finding system according to some embodiments of the present disclosure;
FIG. 3 is a schematic flow chart diagram illustrating the determination of the direction of a radio signal under test in accordance with some embodiments of the present description;
FIG. 4 is a schematic diagram of an interferometer calculation flow shown in accordance with some embodiments herein;
FIG. 5 is a schematic diagram of a similarity determination model according to some embodiments of the present description;
FIG. 6 is a schematic view of a portable monitoring direction-finding device according to some embodiments of the present description.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present specification, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only examples or embodiments of the present description, and that for a person skilled in the art, without inventive effort, the present description can also be applied to other similar contexts on the basis of these drawings. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.
It should be understood that "system," "device," "unit," and/or "module" as used herein is a method for distinguishing between different components, elements, parts, portions, or assemblies of different levels. However, other words may be substituted by other expressions if they accomplish the same purpose.
As used in this specification and the appended claims, the terms "a," "an," "the," and/or "the" are not to be taken in a singular sense, but rather are to be construed to include a plural sense unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
Flow charts are used in this description to illustrate operations performed by a system according to embodiments of the present description. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, the steps may be processed in reverse order or simultaneously. Meanwhile, other operations may be added to or removed from these processes.
Fig. 1 is a schematic diagram of an application scenario 100 of a portable monitoring direction-finding system according to some embodiments of the present description.
In some embodiments, the application scenario 100 may be configured as a radio signal direction finding, positioning, or like application scenario. The method can be applied to corresponding communication control scenes such as radio signal direction finding, radio identification, radio management and the like.
The application scenario 100 may include a server 110, a network 120, a user terminal 130, a storage device 140, and a signal source 150. The server 110 may include a processing engine 112. In some embodiments, server 110, user terminal 130, storage device 140, and signal source 150 may be connected to and/or communicate with each other via a wireless connection (e.g., network 120), a wired connection, or a combination thereof.
The server 110 may be used to implement radio signal direction finding. In some embodiments, the monitoring technology can be specifically used for realizing the monitoring of the radio, and the monitoring technology can be applied to the fields of government departments, national defense troops, news media, customs, diplomatic affairs, combat readiness communication and the like.
The server 110 refers to a system having computing capabilities, and in some embodiments, the server 110 may be a single server or a group of servers. The set of servers can be centralized or distributed (e.g., the servers 110 can be a distributed system). In some embodiments, the server 110 may be local or remote. For example, server 110 may access information and/or data stored in user terminal 130 and/or storage device 140 via network 120. As another example, server 110 may be directly connected to user terminal 130 and/or storage device 140 to access stored information and/or data. In some embodiments, the server 110 may be implemented on a cloud platform. By way of example only, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-tiered cloud, and the like, or any combination thereof.
In some embodiments, the server 110 may include a processing engine 112. The processing engine 112 may process information and/or data related to the wireless signal. For example, the processing engine 112 may implement radio signal direction finding in the information data obtained by the signal source 150. In some embodiments, processing engine 112 may include one or more processing engines (e.g., a single core processing engine or a multi-core processor). By way of example only, the processing engine 112 may include one or more hardware processors such as a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), an application specific instruction set processor (ASIP), a Graphics Processing Unit (GPU), a Physical Processing Unit (PPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), a Programmable Logic Device (PLD), a controller, a microcontroller unit, a Reduced Instruction Set Computer (RISC), a microprocessor, or the like, or any combination thereof.
In some embodiments, the processing engine 112 may be configured to collect a radio signal to be detected in a space, for example, corresponding to fig. 2 to fig. 6, amplify and switch the radio signal to be detected to obtain a processed radio signal, perform at least one of filtering, amplifying, and down-converting on the radio antenna element signal to obtain an intermediate frequency signal, and perform AD data collection and processing on the intermediate frequency signal to obtain an amplitude and a phase difference of the intermediate frequency signal corresponding to two paths of radio antenna element signals; and carrying out interferometer calculation on the amplitude and the phase difference to obtain the incoming wave direction of the radio signal to be detected. The detailed description can refer to the contents of fig. 2 to 6.
In some embodiments, the user terminal 130 may include a mobile device 130-1, a tablet computer 130-2, a laptop computer 130-3, a desktop computer 130-4, and the like, or any combination thereof. In some embodiments, mobile device 140-1 may include a smart home device, a wearable device, a mobile device, a virtual reality device, an augmented reality device, and the like, or any combination thereof. In some embodiments, the smart home devices may include smart lighting devices, smart appliance control devices, smart monitoring devices, smart televisions, smart cameras, interphones, and the like, or any combination thereof. In some embodiments, the wearable device may include a bracelet, footwear, glasses, helmet, watch, clothing, backpack, smart accessory, and the like, or any combination thereof. In some embodiments, the mobile device may include a mobile phone, a Personal Digital Assistant (PDA), a gaming device, a navigation device, a point of sale (POS) device, a laptop computer, a desktop computer, etc., or any combination thereof. In some embodiments, the virtual reality device and/or the enhanced virtual reality device may include a virtual reality helmet, virtual reality glasses, virtual reality eyecups, augmented reality helmets, augmented reality glasses, augmented reality eyecups, and the like, or any combination thereof. For example, the virtual reality device and/or augmented reality device may include a google glass TM 、RiftCon TM 、 Fragments TM 、GearVR TM And the like.
In some embodiments, the user terminal 130 may be a mobile terminal configured to collect radio signals. The user terminal 130 may send and/or receive information related to satellite signal monitoring and identification to the processing engine 112 or a processor installed in the user terminal 130 via a user interface. For example, the user terminal 130 may transmit radio signal data captured by the user terminal 130 installed in the user terminal 120 to the processing engine 112 or the processor installed in the user terminal via the user interface. The user interface may be in the form of an application implemented on the user terminal 130 for identifying satellites. A user interface implemented on the user terminal 130 may facilitate communication between the user and the processing engine 112. For example, a user may enter and/or import radio signal data that needs to be identified via a user interface. The processing engine 112 may receive input signal data via a user interface. As another example, the user may input a request to identify the radio signal via a user interface implemented on the user terminal 130. In some embodiments, in response to the identification request, the user terminal 130 may directly process the radio signal data via a processor of the user terminal 130 based on a signal acquisition device installed in the user terminal 130 as described elsewhere in this application. In some embodiments, in response to the identification request, the user terminal 130 may send the identification request to the processing engine 112 for determining a radio signal based on a signal acquisition device installed by the signal source 150 or elsewhere in the application. In some embodiments, the user interface may facilitate presentation or display of information and/or data (e.g., signals) related to radio signal direction finding received from the processing engine 112. For example, the information and/or data may include results indicative of the content of the radio signal direction finding, or indicative of making a radio signal direction finding, etc. In some embodiments, the information and/or data may be further configured to cause the user terminal 130 to display the results to the user.
In some embodiments, a storage device 140 may be connected to the network 120 to communicate with one or more components (e.g., server 110, user terminal 130) in the application scenario 100. One or more components in the application scenario 100 may access data or instructions stored in the storage device 140 via the network 120. In some embodiments, the storage device 140 may be directly connected to or in communication with one or more components in the application scenario 100 (e.g., server 110, user terminal 130). In some embodiments, the storage device 140 may be part of the server 110.
The signal source 150 is a signal terminal that emits radio signals, and for example, the signal source may be a satellite, a signal generator, a base station, or the like. The radio signals generated by the signal source 150 can be collected based on the corresponding signal collecting device (such as a direction-finding antenna element) in the portable monitoring direction-finding system.
In some embodiments, signal source 150 may include a satellite, a signal generator, a base station, etc. that is designated to emit wireless signals. In some embodiments, the signal source 150 may also include a signal source 150 that emits an interference signal.
It should be noted that the above description is intended to be illustrative, and not to limit the scope of the application. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and/or alternative exemplary embodiments. For example, the signal source 150 may be configured with a storage module, a processing module, a communication module, and the like. However, such changes and modifications do not depart from the scope of the present application.
Fig. 2 is a block diagram of an exemplary configuration of a portable monitoring direction-finding system 200, according to some embodiments of the present disclosure.
As shown in fig. 2, the portable monitoring direction-finding system 200 includes: the device comprises a direction-finding antenna element 210, a matrix switch 220, a radio frequency module 230, an intermediate frequency module 240 and an industrial personal computer 250.
The direction-finding antenna element 210 is configured to collect a radio signal to be detected in a space, and transmit the collected radio signal to be detected to the matrix switch.
The matrix switch 220 is configured to amplify and switch the acquired radio signal to be detected, to obtain a processed radio signal, and transmit the processed radio signal to the radio frequency module in a manner of transmitting two paths of radio antenna element signals each time.
The rf module 230 is configured to perform at least one of filtering, amplifying, and down-converting on the received radio antenna element signal to obtain an intermediate frequency signal, and transmit the intermediate frequency signal to the intermediate frequency module.
The intermediate frequency module 240 is configured to perform AD data acquisition and processing on the intermediate frequency signal to obtain an amplitude and a phase difference of the intermediate frequency signal corresponding to the two radio antenna element signals; and transmitting the amplitude and the phase difference to the industrial personal computer.
The industrial personal computer 250 is used for performing interferometer calculation on the amplitude and the phase difference to obtain the incoming wave direction of the radio signal to be detected.
In some embodiments of the present invention, the direction-finding antenna element is in the form of a passive composite antenna, which has both good gain and good dynamic range. The direction-finding antenna element is used for receiving radio signals in space, the radio signals are directly sent to the radio frequency module through the matrix switch after being received, and the radio frequency module carries out filtering, amplification and down-conversion on the signals to convert the signals into intermediate frequency signals and sends the intermediate frequency signals to the intermediate frequency module. The intermediate frequency module receives the signal and carries out data acquisition and processing on the signal. And finally, the control computer obtains the information of intermediate frequency processing through routing equipment such as a 5G router and the like, and performs frequency spectrum display through upper computer software. The user can find illegal signals according to the display of the frequency spectrum.
In some embodiments, the passive composite antenna may be implemented as an antenna, such as a V-shaped composite folded element antenna, which has both a wider frequency band of the V-shaped antenna and a smaller electrical size of the folded element antenna. The direction-finding antenna of the embodiment can achieve the gain of about-25 dBi in the broadcast frequency band, and the gain value can effectively prevent the receiver from being saturated due to the fact that the broadcast signal power is large. Above 8GHz, the spatial insertion loss of radio signals is large, the gain of the antenna is about 4dBi, and the gain value can ensure that a receiver can receive signals with small power and ensure the sensitivity of the direction-finding antenna. The high-power signal is not distorted, and the low power is not buried.
In some embodiments, two layers of antenna elements are selected for the direction-finding antenna element to cover the radio signal to be measured, and the frequency of the radio signal to be measured is 20MHz-8GHz.
In some embodiments, the two-tier antenna element comprises a low-band direction-finding antenna element that is an active dipole antenna and a high-band direction-finding antenna element that is a deformed log-periodic antenna.
In some embodiments, the low-band direction finding of the two layers of antenna elements is realized based on five-element direction finding, the frequency range of the low band is 20MHz-1GHz, the high-band direction finding of the two layers of antenna elements is realized based on nine-element direction finding, and the frequency range of the high band is 1GHz-8GHz.
In some embodiments, in order to realize low-frequency direction finding with a small aperture, five-element direction finding is adopted for low frequency, so that mutual coupling between antenna elements is effectively reduced, and direction finding precision is guaranteed. The low-frequency direction-finding antenna element is an active dipole antenna. Nine-element direction finding is adopted for high-frequency range direction finding, and direction finding precision is guaranteed. The high-frequency section direction-finding antenna element selects a deformed log periodic antenna, and has the advantages of wide frequency range and high gain.
In some embodiments, the quinary direction finding refers to a quinary antenna array, two antennas are switched on each time through switching, received data are transmitted into the intermediate frequency processing module, and the phase difference of the two switched-on antenna elements is obtained. And continuously switching the switch to obtain the phase difference of any two antennas, processing the phase difference through an algorithm, and calculating to obtain the direction of the electromagnetic wave.
In some embodiments, the nine-element direction finding refers to a nine-element antenna array, two antennas are switched on each time through switching, received data are transmitted to the intermediate frequency processing module, and the phase difference of the two switched-on antenna elements is obtained. And continuously switching the switches to obtain the phase difference of any two antennas, processing the phase difference through an algorithm, and calculating to obtain the direction of the electromagnetic wave.
In some embodiments, the dipole antenna is the basic element of the antenna, and is typically designed to be λ long per arm 0 A total length of λ 0 The/2 symmetric array is called a half-wavelength symmetric array. The dipole antenna used in this embodiment is less than a half wavelength. The active dipole antenna is characterized in that an active amplifying circuit is added at the output end of a dipole and used for amplifying a received signal.
In some embodiments, the deformed log periodic antenna is formed by folding the array of the log periodic dipole antenna, so that miniaturization is realized.
In some embodiments, the direction-finding antenna elements are configured to receive a radio signal in space, and transmit the received radio signal to the matrix switch, and the matrix switch amplifies and switches the received radio signal, and transmits only two paths of signals of the antenna elements at a time, and transmits the signals to the radio frequency module. The matrix switch selects a flexible multi-reference open mode, and different antenna elements can be selected according to frequency, so that a proper phase difference is obtained, and the direction-finding error is effectively reduced.
It should be noted that the above description of the system and its components is for convenience of description only and should not be construed as limiting the present disclosure to the illustrated embodiments. It will be appreciated by those skilled in the art that, given the teachings of the present system, any combination of components or sub-systems may be combined with other components without departing from such teachings. For example, the direction-finding antenna elements, the matrix switch, the radio frequency module, the intermediate frequency module, and the industrial personal computer may be integrated in one component. For another example, the components may share one storage device, and each component may have a storage device. Such variations are within the scope of the present description.
As shown in fig. 3, which is an exemplary flow diagram for determining a direction from which a wireless signal comes according to some embodiments of the present description, in some embodiments, flow 300 may be performed by a zero intermediate frequency receiver. In some embodiments, the flow 300 may include the following steps:
In some embodiments, step 310 may be performed by a direction-finding antenna element. See figure 2 for more description of the direction-finding antenna elements.
In some embodiments, the direction-finding antenna element comprises a dual-channel receiver, and at least one of nine corresponding nine antenna elements for direction finding is correspondingly connected with an input end of a first channel of the dual-channel receiver.
And step 320, amplifying and switching the radio signal to be detected to obtain a processed radio signal.
In some embodiments, step 320 may be performed by a matrix switch. See fig. 2 for further description of the matrix switch. In some embodiments, the matrix switch is a single-pole 8-throw rf switch, and 8 of the nine antenna elements are sequentially connected to the input end of the second channel of the dual-channel receiver in a time-sharing manner.
In some embodiments, the matrix switch may adopt a flexible multi-reference open mode, and different antenna elements may be selected according to frequency, so as to obtain a suitable phase difference and effectively reduce a direction-finding error.
In some embodiments, the multi-reference communication mode is a mode of obtaining a phase difference between another antenna and a reference antenna based on a reference antenna. In some embodiments, the reference antenna is an antenna that is used as a reference antenna at a time, the phase obtained by other antennas is different from the phase of the antenna, only one common reference antenna is used, and all other antennas are different from the reference antenna in phase. For example, in the present embodiment, three reference antennas may be used, so that the phase difference of any two antennas can be obtained.
In some embodiments, the antenna elements are divided into two groups, low frequency and high frequency. The low-frequency direction finding selects a low-frequency antenna, and the high-frequency direction finding selects a high-frequency antenna. The phase difference of the antennas is positively correlated with the distance between the antennas, and the distance is far, the phase difference is large, and the distance is close, and the phase difference is small. Therefore, the phase difference cannot be too large, for example, it cannot exceed one period, otherwise, phase ambiguity occurs, and a correct direction finding result cannot be obtained. Meanwhile, if the phase difference is too small, errors can greatly affect the result, and a correct direction finding result cannot be obtained. It is desirable to use a suitable phase difference, for example, a phase difference that is greater than a preset threshold value and does not exceed one cycle may be used.
In some embodiments, step 330 may be performed by a radio frequency module. See fig. 2 for further description of the rf module. In some embodiments, the frequency of the intermediate frequency signal is 70MHz.
And 340, performing AD data acquisition and processing on the intermediate frequency signals to obtain the amplitude and phase difference of the intermediate frequency signals corresponding to the two paths of radio antenna element signals.
In some embodiments, step 340 may be performed by an intermediate frequency module. See fig. 2 for further description of the intermediate frequency module. And the intermediate frequency module acquires and processes AD data of the obtained intermediate frequency signals to obtain the amplitudes and phase differences of the two paths of signals, and the amplitudes and the phase differences are subjected to correlation interferometer calculation through an algorithm part of an industrial personal computer according to the obtained phase differences to finally obtain the incoming wave direction of the radio signal.
In some embodiments, the direction-finding antenna element receives a signal, transmits two paths of signals to the radio frequency module through the matrix switch, the radio frequency module performs down-conversion processing, converts the radio frequency into a fixed intermediate frequency signal of 70MHz, and transmits the fixed intermediate frequency signal to the intermediate frequency module for processing, and the intermediate frequency module performs sampling processing on the signal to obtain the amplitude and the phase difference of the signal.
In some embodiments, step 350 may be performed by an industrial personal computer. See figure 2 for more description of the industrial personal computer. For further explanation of the interferometer calculations see figure 4.
It should be noted that the above description of the process 300 is for illustration and description only and is not intended to limit the scope of the present disclosure. Various modifications and changes to flow 300 will be apparent to those skilled in the art in light of this description. However, such modifications and variations are intended to be within the scope of the present description.
FIG. 4 illustrates an exemplary flow diagram of an interferometer calculation flow 400 according to some embodiments herein. In some embodiments, the flow 400 may be performed based on an industrial personal computer.
As shown in fig. 4, the process 400 may include the following steps:
in step 410, a first phase difference is calculated.
In some embodiments, if the nine antenna elements corresponding to the nine direction finding are a respectively 0 ～A 8 The nine antenna elements are uniformly distributed on a circumference with a radius of R according to angles, and the antenna element A 0 Is located at the positionDue to north orientation of the centre point of the circumference, said antenna element A 0 Is a reference antenna element; the reference antenna element is correspondingly connected with the input end of a first channel of the dual-channel receiver; the antenna element A 1 ～A 8 And the input end of the second channel of the double-channel receiver is sequentially connected in a time-sharing manner.
In some embodiments, if the azimuth angle of the incoming wave corresponding to the radio signal to be measured is α and the elevation angle is θ, the first phase difference is the nine antenna elements a 0 ～A 8 The phase difference of the induced voltage on the virtual antenna element relative to the induced voltage of the virtual antenna element positioned at the central point of the circumference is respectively as follows:
wherein i =0, 1,2, \ 8230, 8; λ is the wavelength of the incoming wave.
In some embodiments, the second phase difference is antenna element a 1 ～A 8 Induced voltage on with respect to the antenna element a 0 Phase difference phi of induced voltage on m 。
Wherein m =1,2, \8230, 8.
In some embodiments, the third phase difference refers to a phase difference value when θ =0 in equation (2). E.g. phi if theta =0 1 ～φ 8 Are respectively recorded as phi 01 ～Φ 08 Then:
In some embodiments, one may let the theoretical sample point (Φ) 01 ，Φ 02 ，…，Φ 08 ) = e, and e is made up of eight ordered variables Φ 01 ～Φ 08 Characterizing;
if the azimuth angle α changes in steps of 1 ° from 0 °,360 theoretical sample points can be calculated from equation (3):
e i ＝(Φ 01n ，Φ 02n ，…，Φ 08n )，n＝1，2，…，360。 (4)
In some embodiments, the antenna elements a may be sequentially rotated based on the rf switch 1 ～ A 8 Connected to the input end of the second channel of the dual-channel receiver, and measuring the antenna element A 1 ～A 8 Induced voltage on with respect to said antenna element a 0 Are respectively phi 'in phase difference of induced voltage' 01 ，φ′ 02 ，…，φ′ 08 ；
Then the measured sample point e '= (phi' 01 ，φ′ 02 ，…，φ′ 08 )。
In some embodiments, e' may be compared to e i (i =1,2, \8230;, 360) similarity calculation is performed, and the theoretical sample point with the highest similarity to the actually measured sample point e' is determined as the reference point.
In some embodiments, the similarity may be predicted based on a model, see FIG. 5 for a specific description.
In some embodiments, the similarity may be represented based on vector distance, the smaller the vector distance, the higher the similarity.
In some embodiments, the vector distance is the hamming distance:
In some embodiments, an azimuth angle corresponding to the reference point may be used as an incoming wave direction of the radio signal to be detected. For example, in the formula (5), d i In (i =1,2, \8230;, 360), the azimuth angle α corresponding to the smallest value is considered as the incoming wave direction.
It should be noted that the above description related to the flow 400 is only for illustration and description, and does not limit the application scope of the present specification. Various modifications and changes to flow 400 will be apparent to those skilled in the art in light of this description. However, such modifications and variations are intended to be within the scope of the present description.
As shown in fig. 5, which is a schematic diagram of the similarity determination model 500, the similarity determination model 500 may obtain the similarity 570 of the actual measurement sample point 510 and the theoretical sample point 520 based on the processing of the data of the actual measurement sample point 510 and the theoretical sample point 520.
In some embodiments, the similarity determination model 500 may include a machine learning model in which a Recurrent Neural Network (RNN) 530 and a Deep Neural Network (DNN) 560 can implement data evaluation.
In some embodiments, the measured features 540 corresponding to the measured sample points 510 and the theoretical features 550 corresponding to the theoretical sample points 520 may be obtained based on the processing of the measured sample points 510 and the theoretical sample points 520 by the recurrent neural network RNN, respectively. Then, based on the processing of the measured features 540 and the theoretical features 550 by the deep neural network DNN, the similarity 570 of the measured sample points 510 and the theoretical sample points 520 is obtained.
In some embodiments, the output of the recurrent neural network RNN may be the input of the deep neural network DNN, and the recurrent neural network RNN and the deep neural network DNN may be obtained by joint training. For example, training sample data, namely historical actual measurement sample points and historical theoretical sample points obtained historically, are input into the recurrent neural network RNN to obtain actual measurement characteristics and theoretical characteristics output by the recurrent neural network RNN; then, inputting the measured characteristics and the theoretical characteristics as training sample data into a deep neural network DNN to obtain the similarity of DNN output, and verifying the DNN output by using the similarity of historical measured sample points and historical theoretical sample points; and obtaining verification data of the damage rate output by the recurrent neural network RNN by utilizing the back propagation characteristic of the neural network model, and training the recurrent neural network RNN by using the verification data of the damage rate as a label. Tags may be obtained based on manual tagging based on historical data.
For another example, the training sample data includes historical measured sample points and historical theoretical sample points, the historical measured sample points and the historical theoretical sample points are input into the recurrent neural network RNN, measured features and theoretical features output by the recurrent neural network RNN are input into the deep neural network DNN, namely, the output of the recurrent neural network RNN is used as the input of the deep neural network DNN, the label is the similarity between the historical measured sample points and the historical theoretical sample points, the label can be obtained based on historical data labeling, and in the training process, a loss function is established based on the price of the sample preset time and the output of the recurrent neural network RNN to update the parameters of the model.
The parameters of the similarity determination model 500 are obtained through the training mode, which is beneficial to solving the problem that the recurrent neural network RNN is difficult to obtain labels when the recurrent neural network RNN and the deep neural network DNN are used independently under some conditions, and the recurrent neural network RNN can better obtain the actual measurement characteristics and the theoretical characteristics reflecting the characteristics of the actual measurement sample points and the theoretical sample points.
The required calculation amount can be reduced by predicting the number of the acquisition points through the model, the four ounces of the actual measurement sample points and the theoretical sample points can be automatically determined based on actual conditions, and the data acquisition efficiency is improved.
Fig. 6 is a schematic diagram of a portable monitoring direction-finding device 600 according to some embodiments described herein.
In some embodiments, the portable monitoring direction-finding system may be made into a portable device as shown in fig. 6, and as shown in fig. 6, the portable monitoring direction-finding device 600 may include a first data acquisition processing device 610 and a second data acquisition processing device 620, as well as a data processing display device 630 and a communication device 640. The first data collecting and processing device and the second data collecting and processing device may be used as a monitoring part of the movable monitoring direction-finding device 600. The data processing display device can be used as a direction-finding part of the movable monitoring direction-finding equipment 600.
In some embodiments, the first data collecting and processing device 610 includes two sets of direction-finding antenna elements, a set of matrix switch 613, a set of rf module 614, a set of if module 615, and a set of power module 616, where the two sets of direction-finding antenna elements are, respectively, the direction-finding antenna element 611 for acquiring a frequency of 20MHz to 1GHz, and the direction-finding antenna element 612 for acquiring a frequency of 1GHz to 8GHz.
In the first data acquisition and processing device, two groups of direction-finding antenna elements are respectively connected with a matrix switch, the matrix switch, a radio frequency module and an intermediate frequency module are sequentially connected, and a power supply module supplies power to other modules of the first data acquisition and processing device through the intermediate frequency module.
In some embodiments, the second data collecting and processing device 620 includes a set of direction-finding antenna elements 621, a set of radio frequency module 623, a set of intermediate frequency module 625, and a set of power supply module 627, which are sequentially connected. The direction-finding antenna element of the second data acquisition and processing device is used for acquiring signals with the frequency of 20MHz to 8GHz.
In some embodiments, the data processing and displaying device 630 includes a battery pack 631, a 5G router 635, and an industrial control computer 637 connected to each other, the communication device 640 includes a GPS642 and a 5G antenna 644, the communication device is connected to the 5G router, and the battery pack is connected to the power supply modules and the intermediate frequency module of the first data acquisition processing device and the second data acquisition processing device.
For the operation of each module, refer to the rest of the description, such as fig. 2-4.
In some embodiments, the monitoring portion and the direction-finding portion of the movable monitoring direction-finding device 600 each have an external interface, which is a composite interface defining the same power supply and network interface, and is used for power supply and data transmission, and the device is installed by connecting only these two cables.
In some embodiments, the data processing display device, i.e., the 5G router, the industrial personal computer, and the battery pack, may be placed in a portable box for networking, data interaction, and power supply. The battery pack can ensure continuous operation time of at least 8 hours, and if longer time is needed, the battery pack can be connected in parallel.
In some embodiments, when the device is erected, the monitoring part is connected with a tripod, the direction-finding part is arranged on the top of the monitoring part, and the connection is simple.
In conclusion, the technical scheme realizes the covering of the frequency of 20MHz-8000MHz by two layers of antennas by adopting the broadband antenna element with the variable phase center. The mode of two layers of different numbers of antenna elements is adopted, so that low-frequency and high-frequency indexes are realized, and the requirements of customers are better met. Wherein, because the antenna has small size, the outer diameter is only 70 cm. And in the low frequency, the wavelength is longer, 5-element low frequency is adopted for reducing the coupling between the antennas, the distance between the antennas is increased, and high direction finding precision can be realized. The phase center of the nine-element antenna is reduced along with the rise of the frequency, so that the phase ambiguity is effectively prevented, and the high-frequency direction-finding precision can be realized. Meanwhile, the antenna of the technical scheme has light weight, small volume, capability of being lifted by a single person and simple carrying, and can realize the aperture of the antenna not more than 70 cm and the weight not more than 13 kilograms. Folding and stretching are not needed, the cable can be used only by connecting two cables after being erected, working time is saved, and meanwhile, commercial power is not needed, and continuous working for at least 8 hours can be guaranteed.
It should be noted that the above description of the system and its components is for convenience of description only and should not be construed as limiting the present disclosure to the illustrated embodiments. It will be appreciated by those skilled in the art that, given the teachings of the present system, any combination of components or sub-systems may be combined with other components without departing from such teachings. For example, the data source selection module and the spectral analysis playback control module may be integrated in one component. For another example, the components may share one storage device, and each component may have a storage device. Such variations are within the scope of the present disclosure.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be considered as illustrative only and not limiting, of the present invention. Various modifications, improvements and adaptations to the present description may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present specification and thus fall within the spirit and scope of the exemplary embodiments of the present specification.
Also, the description uses specific words to describe embodiments of the specification. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means a feature, structure, or characteristic described in connection with at least one embodiment of the specification. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, certain features, structures, or characteristics may be combined as suitable in one or more embodiments of the specification.
Additionally, the order in which the elements and sequences of the process are recited in the specification, the use of alphanumeric characters, or other designations, is not intended to limit the order in which the processes and methods of the specification occur, unless otherwise specified in the claims. While various presently contemplated embodiments of the invention have been discussed in the foregoing disclosure by way of example, it is to be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements that are within the spirit and scope of the embodiments herein. For example, although the system components described above may be implemented by hardware devices, they may also be implemented by software-only solutions, such as installing the described system on an existing server or mobile device.
Similarly, it should be noted that in the foregoing description of embodiments of the present specification, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to imply that more features than are expressly recited in a claim. Indeed, the embodiments may be characterized as having less than all of the features of a single disclosed embodiment.
Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit-preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range in some embodiments of the specification are approximations, in specific embodiments, such numerical values are set forth as precisely as possible within the practical range.
For each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited in this specification, the entire contents of each are hereby incorporated by reference into this specification. Except where the application history document is inconsistent or contrary to the present specification, and except where the application history document is inconsistent or contrary to the present specification, the application history document is not inconsistent or contrary to the present specification, but is to be read in the broadest scope of the present claims (either currently or hereafter added to the present specification). It is to be understood that the descriptions, definitions and/or uses of terms in the accompanying materials of this specification shall control if they are inconsistent or contrary to the descriptions and/or uses of terms in this specification.
Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments described herein. Other variations are also possible within the scope of the present description. Thus, by way of example, and not limitation, alternative configurations of the embodiments of the specification can be considered consistent with the teachings of the specification. Accordingly, the embodiments of the present description are not limited to only those embodiments explicitly described and depicted herein.
Claims (10)
1. A movable monitoring and direction-finding system is characterized by comprising a direction-finding antenna element, a matrix switch, a radio frequency module, an intermediate frequency module and an industrial personal computer which are sequentially connected in a communication manner;
the direction-finding antenna element is used for collecting a radio signal to be detected in space and transmitting the collected radio signal to be detected to the matrix switch;
the matrix switch is used for amplifying and switching the acquired radio signal to be detected to obtain a processed radio signal, and transmitting the processed radio signal to the radio frequency module in a mode of transmitting two paths of radio antenna element signals each time;
the radio frequency module is used for performing at least one of filtering processing, amplifying processing and down-conversion processing on the received radio antenna element signal to obtain an intermediate frequency signal, and transmitting the intermediate frequency signal to the intermediate frequency module;
the intermediate frequency module is used for carrying out AD data acquisition and processing on the intermediate frequency signals to obtain the amplitude and phase difference of the intermediate frequency signals corresponding to the two paths of radio antenna element signals; transmitting the amplitude and the phase difference to the industrial personal computer;
and the industrial personal computer is used for carrying out interferometer calculation on the amplitude and the phase difference to obtain the incoming wave direction of the radio signal to be detected.
2. The movable monitoring direction-finding system of claim 1, wherein two layers of antenna elements are selected for the direction-finding antenna elements to cover the radio signal to be tested, and the frequency of the radio signal to be tested is 20MHz-8GHz.
3. The movable monitoring direction-finding system of claim 2, characterized in that the two layers of antenna elements comprise a low-frequency direction-finding antenna element and a high-frequency band direction-finding antenna element, the low-frequency direction-finding antenna element is an active dipole antenna, and the high-frequency band direction-finding antenna element is a deformed log periodic antenna.
4. The movable monitoring direction-finding system of claim 2, wherein the frequency of the intermediate frequency signal is 70MHz.
5. The movable monitoring direction-finding system of claim 2, wherein the low-band direction-finding of the two layers of antenna elements is realized based on five-element direction-finding, the frequency range of the low-band is 20MHz-1GHz, the high-band direction-finding of the two layers of antenna elements is realized based on nine-element direction-finding, and the frequency range of the high-band is 1GHz-8GHz.
6. The movable monitoring direction-finding system of claim 5, characterized in that the direction-finding antenna elements comprise a dual-channel receiver, and at least one of the nine antenna elements corresponding to the nine direction-finding elements is correspondingly connected with the input end of the first channel of the dual-channel receiver.
7. The portable monitoring and direction-finding system of claim 6, wherein the matrix switch is a single-pole 8-throw rf switch, and 8 of the nine antenna elements are sequentially connected to the input end of the second channel of the dual-channel receiver in a time-sharing manner.
8. The movable monitoring direction-finding system of claim 7, wherein the interferometer calculation comprises:
calculating a first phase difference, a second phase difference and a third phase difference;
calculating theoretical sample points;
determining an actually measured sample point;
calculating the similarity between the theoretical sample point and the measured sample point;
and determining the incoming wave direction of the radio signal to be detected.
9. The portable monitoring direction-finding system according to claim 8,
if the nine antenna elements corresponding to the nine direction finding are A respectively 0 ～A 8 The nine antenna elements are uniformly distributed on a circumference with a radius of R according to angles, and the antenna element A 0 At the north orientation of the central point of the circle, the antenna element A 0 Is a reference antenna element; the reference antenna element is correspondingly connected with the input end of a first channel of the dual-channel receiver; the antenna element A 1 ～A 8 The input end of the second channel of the double-channel receiver is sequentially connected with the input end of the second channel in a corresponding time-sharing manner;
if the azimuth angle of the incoming wave corresponding to the radio signal to be detected is alpha and the elevation angle is theta, the nine antenna elements A 0 ～A 8 The phase difference of the induced voltage on the virtual antenna element relative to the induced voltage of the virtual antenna element positioned at the central point of the circumference is respectively as follows:
wherein i =0, 1,2, \8230, 8; λ is the wavelength of the incoming wave;
antenna element A 1 ～A 8 Induced voltage on with respect to the antenna element a 0 The phase difference of the induced voltage is as follows:
wherein m =1,2, \8230, 8;
phi if theta =0 1 ～φ 8 Are respectively recorded as phi 01 ～Φ 08 And then:
let the theoretical sample point (phi) 01 ，Φ 02 ，…，Φ 08 ) = e, and e is composed of eight ordered variables Φ 01 ～Φ 08 Characterizing;
if the azimuth angle α is varied in 1 ° steps from 0 °,360 theoretical sample points can be calculated from equation (3):
e i ＝(Φ 01n ，Φ 02n ，…，Φ 08n )，n＝1，2，…，360；
sequentially and alternately switching the antenna elements A based on the radio frequency switch 1 ～A 8 Connected to the input end of the second channel of the dual-channel receiver, and measuring the antenna element A 1 ～A 8 Induced voltage on with respect to said antenna element a 0 Are respectively phi 'in phase difference' 01 ，φ′ 02 ，…，φ′ 08 ；
Let measured sample point e '= (φ' 01 ，φ′ 02 ，…，φ′ 08 )；
E' and e i (i =1,2, \8230;, 360) performing similarity calculation, and determining a theoretical sample point with the highest similarity with the actually measured sample point e' as a reference point;
and taking the azimuth angle corresponding to the reference point as the incoming wave direction of the radio signal to be detected.
10. The movable monitoring direction-finding system of claim 9, wherein the similarity is expressed based on vector distance, and the smaller the vector distance, the higher the similarity.
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