CN118316566A - Radio interference system and method for polarization backtracking - Google Patents
Radio interference system and method for polarization backtracking Download PDFInfo
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Abstract
The application discloses a radio interference system for polarization backtracking. The orthogonal transmitting and receiving antenna is an antenna shared by receiving and transmitting, and is composed of a combination of a vertically polarized antenna and a horizontally polarized antenna. The transmit-receive path includes a receive path and a transmit path. The software radio level station detects the received signal from the receive channel, obtains the amplitude and phase of a pair of orthogonal electric field components E Rx and E Ry of the received signal, regenerates a pair of orthogonal electric field components E Tx and E Ty having the same proportion of amplitude and phase as interference signals, and sends the interference signals to the transmit channel. The servo and rotating mechanism enables the orthogonal receiving and transmitting antenna to be always aligned with the target equipment in a displacement and/or rotation mode. The method acquires the polarization mode of the communication antenna of the target equipment through orthogonal channel detection, and directly generates the interference signal by adopting a polarization backtracking method, so that the interference signal and the normal communication signal of the target equipment have the same polarization mode.
Description
Technical Field
The present application relates to the field of wireless communications, and in particular, to a radio interference (radio jamming) system and method.
Background
The radio interference system is used for transmitting high-power interference signals to the target device, so that the power of the interference signals reaching the target device is far greater than the power of normal communication signals expected to be received by the target device, and normal communication of the target device is blocked. The radio interference system can be used for interfering unmanned targets such as unmanned aerial vehicles, unmanned ships and the like, and can also be used for interfering unmanned targets such as communication radio stations, data transmission radio stations, remote control radio stations and the like.
Polarization matching (polarization matching) between the radio interference system and the target device is crucial. The normal communication signals of the target device mostly adopt a vertical polarization (vertical polarization) mode, so that the interference signals transmitted by the radio interference system also mostly adopt a vertical polarization mode. The normal communication signals of the target devices are not necessarily standard vertical polarizations, and even do not necessarily employ vertical polarizations, which causes interference effects of the same radio interference system on different target devices to be different, or even very different. If the normal communication signal of the target device adopts a horizontal polarization (horizontal polarization) mode, and the interference signal transmitted by the radio interference system adopts a vertical polarization mode, the two signals have the highest polarization isolation (polarization isolation), and the interference effect is poor. If normal communication signals of the target device adopt a 45-degree inclined linear polarization (linear polarization) or circular polarization (circular polarization) mode, and interference signals transmitted by the radio interference system adopt a vertical polarization mode, polarization loss of about 3dB exists between the two signals. Even if the normal communication signal of the target device is standard vertical polarization, taking the unmanned aerial vehicle as an example, the transmitting antenna of the radio interference system has an elevation angle when pointing to the unmanned aerial vehicle, so that the interference signal is already oblique polarization but not vertical polarization when being sent out; the unmanned aerial vehicle also has an inclination angle in the air flight process, so that the interference signal can be obliquely polarized rather than vertically polarized when arriving at the unmanned aerial vehicle. The two factors are overlapped to consider the extreme situation, the transmitting antenna of the radio interference system is in a 45-degree elevation angle (a pitch angle of 45 degrees), the communication antenna of the unmanned aerial vehicle is in an inclined 45-degree inclination angle (an azimuth angle of 45 degrees), so that the polarization loss between the two signals reaches as much as 6dB, and the interference efficiency is directly reduced by 6dB.
If the polarization of the transmitting antenna of the radio interference system is identical to the polarization of the communication antenna of the target device, the polarization of the interference signal transmitted by the radio interference system can be identical to the polarization of the normal communication signal of the target device, which is called polarization matching. The polarization loss can be completely eliminated under the scene of polarization matching, and the best interference effect is achieved.
Disclosure of Invention
The technical problem to be solved by the application is how to improve the radio interference effect, and the main technical attack direction is to realize polarization matching between the transmitting antenna of the radio interference system and the communication antenna of the target equipment.
In order to solve the technical problems, the application provides a radio interference system for polarization backtracking, which comprises an orthogonal receiving and transmitting antenna, a receiving and transmitting channel, a software radio platform, a servo and a rotating mechanism. The orthogonal receiving and transmitting antenna is an antenna shared by receiving and transmitting, and is formed by combining a vertical polarized antenna and a horizontal polarized antenna; when the orthogonal receiving and transmitting antenna is used for receiving, the orthogonal receiving and transmitting antenna receives an electric field component E Rx in the x-axis direction and an electric field component E Ry in the y-axis direction of a normal communication signal of the target device and sends the electric field components E Ry to a receiving channel; When the antenna is used for transmitting, the orthogonal receiving and transmitting antenna acquires an electric field component E Tx in the x-axis direction and an electric field component E Ty in the y-axis direction of an interference signal from a transmitting channel and transmits the electric field components E Ty to a target device. The receiving and transmitting channels comprise receiving channels and transmitting channels; the receiving channel is provided with two receiving amplifiers which respectively amplify a pair of orthogonal electric field components E Rx and E Ry of signals received by the orthogonal receiving and transmitting antenna; The transmit channel has two transmit amplifiers that power amplify a pair of orthogonal electric field components E Tx and E Ty, respectively, of the interference signal generated by the software radio-level station. The software radio level station detects a received signal transmitted from a receiving channel, obtains the amplitude and phase of a pair of orthogonal electric field components E Rx and E Ry of the received signal, regenerates a pair of orthogonal electric field components E Tx and E Ty having the same proportion of amplitude and phase as an interference signal, and to the emission channel; The same ratio of amplitude refers to the ratio of the amplitude of E Ty to the amplitude of E Tx being equal to the ratio of the amplitude of E Ry to the amplitude of E Rx, the same ratio of phases means that the difference between the phase of E Ty and the phase of E Tx is equal to the difference between the phase of E Ry and the phase of E Rx. The servo and rotating mechanism enables the orthogonal receiving and transmitting antenna to be always aligned with the target equipment in a displacement and/or rotation mode.
Further, when receiving, the orthogonal transceiver antenna approximates the normal communication signal of the target device to a plane wave propagating along the z-axis direction, the horizontal polarization antenna receives the electric field component E Rx in the x-axis direction of the normal communication signal of the target device, and the vertical polarization antenna receives the electric field component E Ry in the y-axis direction of the normal communication signal of the target device. When the antenna is used for transmitting, the orthogonal receiving and transmitting antenna approximates an interference signal to a plane wave propagating along the z-axis direction, the horizontal polarization antenna transmits an electric field component E Tx along the x-axis direction of the interference signal, and the vertical polarization antenna transmits an electric field component E Ty along the y-axis direction of the interference signal.
Further, the two receive amplifiers have the same amplitude response and the same phase response; the two transmit amplifiers also have the same amplitude response and the same phase response; the same amplitude response refers to: when signals with the same amplitude are input, the output signals also have the same amplitude; the same phase response refers to: when signals of the same phase are input, the output signals also have the same phase.
Preferably, the transceiver channel comprises two all-two switches, two receiving amplifiers and two transmitting amplifiers; the first switch and the first receiving amplifier form an x-axis direction receiving channel; the first switch and the first transmitting amplifier form an x-axis direction transmitting channel; the second switch and the second receiving amplifier form a y-axis direction receiving channel; the second switch and the second transmitting amplifier form a y-axis direction transmitting channel; the x-axis direction receiving channel and the y-axis direction receiving channel form a complete receiving channel; the x-axis direction emission channel and the y-axis direction emission channel form a complete emission channel; two all-two switches are used for determining whether the receiving channel works or the transmitting channel works at a certain moment, and only one of the receiving channel and the transmitting channel works at any moment; when the receiving channel works, the two receiving amplifiers amplify signals of E Rx and E Ry respectively; when the transmit channel is in operation, the two transmit amplifiers power amplify E Tx and E Ty, respectively.
Further, the software radio platform generates an interference signal with the same proportion of amplitude and phase as the received signal, so that the interference signal and the received signal have the same polarization, that is, the transmitting antenna of the radio interference system and the communication antenna of the target device have the same polarization.
Preferably, the software radio level stage comprises a processing core; the processing core specifically comprises a baseband signal generation module, an amplitude-phase calculation module and an interference signal generation module; the baseband signal generation module is used for generating a baseband signal of the interference signal; The amplitude and phase calculation module is used for detecting and calculating the amplitude and phase of E Rx and E Ry to obtain the relative amplitude of E Rx and E Ry, and the relative phases of E Rx and E Ry; The interference signal generating module is used for generating a pair of quadrature electric field components E Tx and E Ty according to the baseband signal of the interference signal and the relative amplitudes and phases of E Rx and E Ry, The resulting requirement is that the ratio of the amplitude of E Ty to the amplitude of E Tx is equal to the ratio of the amplitude of E Ry to the amplitude of E Rx, And the difference between the phase of E Ty and the phase of E Tx is equal to the difference between the phase of E Ry and the phase of E Rx; E Tx is an electric field component in the x-axis direction of the interference signal, E Ty is an electric field component in the y-axis direction of the interference signal, and spatial synthesis of the two forms the interference signal.
Preferably, the software radio platform further comprises two analog-to-digital converters for converting the amplified analog form of E Rx and E Ry of the receive channel into digital form, respectively, the two analog-to-digital converters having the same amplitude response and the same phase response. The software defined radio platform further includes two digital-to-analog converters for converting the digital forms E Tx and E Ty generated by the processing core to analog forms, respectively, the two digital-to-analog converters having the same amplitude response and the same phase response.
Preferably, the analog-to-digital converter and the digital-to-analog converter are integrated on the same chip; the whole receiving link and the whole transmitting link are only different from each other in a receiving amplifier and a transmitting amplifier in a receiving-transmitting channel, and the processing core corrects and compensates the inconsistency between Gx and Gy; gx refers to the amplitude and phase response from E Rx to E Tx, gy refers to the amplitude and phase response from E Ry to E Ty.
Further, the radar detects the position of the target device in real time and provides the azimuth angle and the pitch angle of the target device, and the servo and rotating mechanism adjusts the pointing angle of the orthogonal receiving and transmitting antenna according to the azimuth angle and the pitch angle of the target device provided by the radar, so that the orthogonal receiving and transmitting antenna keeps pointing to the target device in real time.
The application also provides a radio interference method for polarization backtracking, which comprises the following steps. Step S1: the orthogonal transmitting and receiving antenna shared by transmitting and receiving is aligned with the target device in real time, receives the electric field component E Rx in the x-axis direction and the electric field component E Ry in the y-axis direction of the normal communication signal of the target device, and sends the signals to the receiving channel. Step S2: the receiving channel amplifies the signals of a pair of orthogonal electric field components E Rx and E Ry of the signals received by the orthogonal receiving and transmitting antenna and sends the amplified signals to the software radio platform. Step S3: the software radio level station detects the received signal from the receiving channel, obtains the amplitude and phase of a pair of orthogonal electric field components E Rx and E Ry in the received signal, regenerates a pair of orthogonal electric field components E Tx and E Ty with the same proportion of amplitude and phase as interference signals, and to the emission channel; The same ratio of amplitude refers to the ratio of the amplitude of E Ty to the amplitude of E Tx being equal to the ratio of the amplitude of E Ry to the amplitude of E Rx, the same ratio of phases means that the difference between the phase of E Ty and the phase of E Tx is equal to the difference between the phase of E Ry and the phase of E Rx. step S4: the transmitting channel amplifies the power of a pair of orthogonal electric field components E Tx and E Ty of the interference signal generated by the software radio level station and transmits the amplified signals to the orthogonal receiving and transmitting antenna. Step S5: the orthogonal receiving and transmitting antenna shared by receiving and transmitting is aligned to the target equipment in real time, an electric field component E Tx in the x-axis direction and an electric field component E Ty in the y-axis direction of the interference signal are obtained from a transmitting channel and transmitted to the target equipment, and the interference signal with the same polarization mode as the received signal is formed through spatial synthesis after the E Tx and the E Ty are transmitted.
The application adopts the technical means of polarization backtracking, namely detecting the polarization mode of the received signal and generating the transmitting signal with the same polarization mode. The polarization backtracking enables the orthogonal receiving and transmitting antenna of the radio interference system and the communication antenna of the target equipment to be identical in polarization mode, so that the optimal interference effect can be obtained.
Drawings
Fig. 1 is a schematic diagram of a polarization retrospective radio interference system according to the present application.
Fig. 2 is a schematic diagram of an example of a transmit-receive channel.
Fig. 3 is a schematic structural diagram of one example of a software radio platform.
Fig. 4 is a flow chart of a radio interference method of polarization backtracking proposed by the present application.
The reference numerals in the drawings illustrate: the antenna is characterized in that the antenna is an orthogonal transceiver antenna, the transceiver channels are 2, the switches are 21 and 22, the receiving amplifiers are 23 and 24, the transmitting amplifiers are 25 and 26, the software radio platform is 3, the processing core is 31, the baseband signal generating module is 311, the amplitude and phase calculating module is 312, the interference signal generating module is 313, the analog-to-digital converters are 32 and 33, the digital-to-analog converters are 34 and 35, and the servo and rotating mechanism is 4.
Detailed Description
The polarization matching between the transmitting antenna of the radio interference system and the communication antenna of the target device is to be achieved, depending on two points. The first is how to acquire the polarization of the communication antenna of the target device, that is, how to acquire the polarization of the normal communication signal of the target device. The conventional method is to acquire the normal communication signal of the target device through spectrum detection, wherein the spectrum detection is generally a power detection method, scalar (scalar) information is acquired, and the polarization mode of the normal communication signal of the target device cannot be acquired. The application instead obtains a pair of orthogonal electric field components, both vectors, of the normal communication signal of the target device. The vector information contains a polarization mode, and the polarization mode of the normal communication signal of the target device can be known through the amplitude and the phase of the pair of orthogonal electric field components, and the polarization mode of the communication antenna of the target device can also be known. Secondly, a vector signal generating and transmitting mechanism is needed to be provided, namely, an interference signal with the same polarization mode as a normal communication signal of the target device is generated and transmitted, namely, a transmitting antenna of the radio interference system and a communication antenna of the target device have the same polarization mode, namely, polarization matching is achieved.
The electromagnetic wave radiated by the antenna is spherical wave, but on a spherical surface taking a certain point on the antenna as a center and a far-field distance r as a radius, a small area of an adjacent range of the maximum pointing direction of the antenna is taken, and the electromagnetic wave on the small area can be similar to plane wave. The antenna far field region radiated electric field E can thus be represented by plane waves propagating in the z-axis direction, i.e., by the electric field component E x in the x-axis direction and the electric field component E y in the y-axis direction. Both E x and E y are vectors, and have amplitudes (amplitudes) and phases, and different polarization modes of electromagnetic waves are reflected as different laws of the amplitudes and phases of E x and E y. For example, when the electric field vector E of the electromagnetic wave is a linearly polarized wave, the phases of E x and E y are identical or differ by pi. When the electric field vector E of electromagnetic wave is circular polarized wave, the amplitudes of E x and E y are identical, and their phases are different. When the electric field vector E of the electromagnetic wave is an elliptically polarized wave, the amplitude and phase of E x and E y are different. Just as the polarization of the electric field vector E is implicit in the amplitude and phase of E x and E y, electromagnetic waves having the same polarization can be generated by this law.
Referring to fig. 1, the polarization backtracking radio interference system of the present application includes an orthogonal transceiving antenna 1, a transceiving channel 2, a software defined radio (Software Defined Radio, SDR) platform 3, and a servo and rotation mechanism 4.
The orthogonal transmitting and receiving antenna 1 is an antenna common to both reception and transmission, and is an orthogonal polarized antenna composed of a combination of a vertical polarized antenna and a horizontal polarized antenna. For receiving, the orthogonal transceiver antenna 1 considers that the normal communication signal of the target device is a plane wave propagating along the z-axis direction, receives the electric field component E Rx in the x-axis direction and the electric field component E Ry in the y-axis direction of the normal communication signal of the target device (preferably, the normal communication signal transmitted by the target device), and sends the signals to the receiving channel; at this time, the horizontal polarized antenna is used to receive E Rx, and the vertical polarized antenna is used to receive the pair of orthogonal electric field components E Ry.ERx and E Ry, which completely contains all the information of the normal communication signal of the target device. When the orthogonal transceiver antenna 1 is used for transmitting, the orthogonal transceiver antenna 1 considers that the interference signal is a plane wave propagating along the z-axis direction, acquires an electric field component E Tx in the x-axis direction and an electric field component E Ty in the y-axis direction of the interference signal from a transmitting channel and transmits the electric field component E Ty to a target device; at this time, the horizontal polarized antenna is used to transmit E Tx, and the vertical polarized antenna is used to transmit E Ty.ETx and E Ty, where the pair of orthogonal electric field components completely contains all information of the interference signal.
The transceiver channel 2 comprises a receiving channel and a transmitting channel. The receiving channel is used for amplifying signals received by the orthogonal receiving and transmitting antenna 1 (namely normal communication signals of the target device) and sending the signals to the software radio platform 3. Specifically, the reception channel has two reception amplifiers that amplify a pair of orthogonal electric field components E Rx and E Ry of the signal received by the orthogonal transmitting-receiving antenna 1, respectively. The two receive amplifiers have the same amplitude response and the same phase response. The same amplitude response refers to: when signals of the same amplitude are input, the output signals also have the same amplitude. The same phase response refers to: when signals of the same phase are input, the output signals also have the same phase. The transmitting channel is used for amplifying the power of the interference signal generated by the software radio platform 3 and then transmitting the amplified interference signal to the orthogonal receiving and transmitting antenna 1. Specifically, the transmit channel has two transmit amplifiers that power amplify a pair of orthogonal electric field components E Tx and E Ty, respectively, of the interference signal generated by the software defined radio platform 3. The two transmit amplifiers also have the same amplitude response and the same phase response. In the case where the gain of the orthogonal transmit-receive antenna 1 is fixed, the power amplification of the transmit path determines the range of the overall radio interference system.
Referring to fig. 2, this is an example of a transmit receive channel. The transceiving channel 2 comprises two all two switches 21 and 22, two receiving amplifiers 23 and 24, and two transmitting amplifiers 25 and 26. The first switch 21 and the first receiving amplifier 23 constitute an x-axis direction receiving channel. The first switch 21 and the first transmission amplifier 25 constitute an x-axis direction transmission channel. The second switch 22 and the second receiving amplifier 24 constitute a y-axis direction receiving channel. The second switch 22 and the second transmit amplifier 26 form a y-axis directional transmit path. The x-axis direction receiving channel and the y-axis direction receiving channel constitute a complete receiving channel. The x-axis direction emission channel and the y-axis direction emission channel constitute a complete emission channel. Two switches 21 and 22 are used to determine whether the receive channel is active or the transmit channel is active at a time, only one of the receive channel and the transmit channel being active at any one time. When the receive channel is in operation, the two receive amplifiers 23 and 24 amplify the signals E Rx and E Ry, respectively. When the transmit channel is in operation, the two transmit amplifiers 25 and 26 power amplify E Tx and E Ty, respectively.
The software radio platform 3 is configured to detect the amplified received signal of the receiving channel, obtain the amplitude and phase of a pair of orthogonal electric field components E Rx and E Ry of the received signal, regenerate a pair of orthogonal electric field components E Tx and E Ty with the same proportion of amplitude and phase as an interference signal, and send the interference signal to the transmitting channel.This means that the magnitude of E Rx is |E Rx |, and the phase is φ Rx.This means that the magnitude of E Ry is |E Ry |, and the phase is φ Ry.This means that the magnitude of E Tx is |E Tx |, and the phase is φ Tx.This means that the magnitude of E Ty is |E Ty |, and the phase is φ Ty. The same ratio of amplitude meansThe phases of the same proportion refer to. Since the polarization modes of the received signals are implied in the amplitudes and phases of E Rx and E Ry, by generating the interference signals with the same proportion of amplitudes and phases, the interference signals and the received signals have the same polarization mode, that is, the transmitting antenna of the radio interference system and the communication antenna of the target device have the same polarization mode, that is, polarization matching is achieved. The present application refers to this technical means of detecting the polarization of the received signal and generating a transmitted signal with the same polarization as the polarization traceback. The polarization backtracking makes the interference signal sent by the orthogonal receiving and transmitting antenna 1 have the most ideal interference effect after reaching the communication antenna of the target equipment.
Referring to fig. 3, this is one example of a software radio platform. The software radio platform 3, for example, comprises a field-programmable gate array (FPGA) GATE ARRAY as a processing core 31, two analog-to-digital converters (AD) 32 and 33, and two digital-to-analog converters (DA) 34 and 35. The processing core 31 specifically includes a baseband signal generation module 311, an amplitude-phase calculation module 312, and an interference signal generation module 313. The baseband signal generating module 311 is configured to generate a baseband signal of the interference signal. The amplitude and phase calculation module 312 is used to detect and calculate the amplitude and phase of E Rx and E Ry to obtain the relative amplitudes of E Rx and E Ry And the relative phases of E Rx and E Ry And passes the parameters to the interference signal generating module 313 through the internal bus. The interference signal generating module 313 is configured to generate a pair of orthogonal electric field components E Tx and E Ty according to the baseband signal of the interference signal and the relative amplitudes and phases of E Rx and E Ry, where the generation requirement is thatAnd. E Tx is an electric field component in the x-axis direction of the interference signal, E Ty is an electric field component in the y-axis direction of the interference signal, and spatial synthesis of the two forms the interference signal. The two analog-to-digital converters 32 and 33 are respectively used to convert the pair of orthogonal electric field components E Rx and E Ry of the analog form of the received signal amplified by the receive channel into the pair of orthogonal electric field components E Rx and E Ry of the digital form of the received signal. The two analog-to-digital converters 32 and 33 have the same amplitude response and the same phase response. The two digital-to-analog converters 34 and 35 are used to convert the pair of orthogonal electric field components E Tx and E Ty of the interference signal in digital form, generated by the processing core 31, into a pair of orthogonal electric field components E Tx and E Ty of the interference signal in analog form, respectively. The two digital-to-analog converters 34 and 35 have the same amplitude response and the same phase response.
The servo and rotation mechanism 4 is used to always align the quadrature transmit-receive antenna 1 to the target device. For example, the radar detects the position of the target device in real time and provides the pointing angle of the target device (including the azimuth angle and the pitch angle of the position of the target device), and the servo and rotation mechanism 4 adjusts the pointing angle of the orthogonal transceiver antenna 1 according to the pointing angle provided by the radar, for example, by displacing and/or rotating the orthogonal transceiver antenna 1 to keep the orthogonal transceiver antenna pointing at the target device in real time.
The servo and rotation mechanism 4 is a mechanism that inputs azimuth and pitch angle data and can be pointed to a given azimuth and pitch angle position. The servo and rotating mechanism 4 is used as a base, and the orthogonal receiving and transmitting antenna 1, the receiving and transmitting channel 2 and the software radio platform 3 are all arranged on the base. The servo and rotation mechanism 4 has only mechanical installation relation with the orthogonal receiving and transmitting antenna 1, the receiving and transmitting channel 2 and the software radio platform 3, and has no other electric interface relation. The orthogonal receiving and transmitting antenna 1 is a directional antenna, and can only best play the effect of polarization backtracking when the antenna points to the target device. The servo and rotation mechanism 4 provides a function of changing the azimuth angle and the pitch angle to which the quadrature transceiving antenna 1 is directed, so that the quadrature transceiving antenna 1 is always directed to the target device.
In order to make the effect of polarization backtracking as ideal as possible, the present application has the following preferable requirements. First, the radio interference system employs an antenna common to transmission and reception in order to avoid deviation due to inconsistency of the antennas in signal reception and signal transmission. For the target device, the normal communication signal of the target device represents the polarization characteristic of the communication antenna of the target device, and then the communication antenna of the target device has the same polarization characteristic as the receiving antenna. For radio interference systems, the same polarization characteristics are exhibited by using a common antenna for both reception and transmission. Second, in the transceiver channel of the radio interference system, two all-two switches are of the same specification. The software wireless level station of the radio interference system adopts AD and DA chips which are integrated with each other, namely, the AD and the DA are integrated on the same chip. Thus the AD and DA share the local oscillator and clock and thus have a relatively uniform (ideally identical) amplitude response and phase response. Third, after the first two requirements are fulfilled, the whole receiving chain and the whole transmitting chain are only different from each other in the receiving amplifier and the transmitting amplifier in the receiving and transmitting channels, the receiving amplifier usually adopts a low noise amplifier, the transmitting amplifier usually adopts a power amplifier, and the receiving amplifier and the transmitting amplifier cannot be shared, so that the difference of amplitude response and/or phase response can be generated. Assuming that the amplitude response from E Rx to E Tx is |G x |, the phase response from E Rx to E Tx is φ Gx, then the amplitude and phase response from E Rx to E Tx can be expressed collectively as. Assuming that the amplitude response from E Ry to E Ty is |G y |, the phase response from E Ry to E Ty is φ Gy, then the amplitude and phase response from E Ry to E Ty can be expressed collectively as. The processing core in the software radio platform corrects and compensates the inconsistency of Gx and Gy, thereby realizing that the whole receiving link and the whole transmitting link have the same amplitude response and the same phase response and achieving the ideal polarization backtracking effect as much as possible.
Referring to fig. 4, the radio interference method for polarization backtracking according to the present application includes the following steps. The method shown in fig. 4 corresponds to the system shown in fig. 1.
Step S1: the orthogonal transmit-receive antenna shared by the transmission and the reception is aligned with the target device in real time, and the normal communication signal of the target device (preferably, the normal communication signal transmitted by the target device) is considered to be a plane wave propagating along the z-axis direction, and the electric field component E Rx in the x-axis direction and the electric field component E Ry in the y-axis direction of the normal communication signal of the target device are received and sent to the receiving channel.
Step S2: the receiving channel amplifies the signals received by the orthogonal receiving and transmitting antenna (i.e. the normal communication signals of the target device) by a pair of orthogonal electric field components E Rx and E Ry, and then sends the signals to the software radio platform.
Step S3: the software radio level station detects the received signal from the receive channel, obtains the amplitude and phase of a pair of orthogonal electric field components E Rx and E Ry of the received signal, regenerates a pair of orthogonal electric field components E Tx and E Ty having the same proportion of amplitude and phase as interference signals, and sends the interference signals to the transmit channel. The same ratio of amplitude meansThe phases of the same proportion refer to. Specifically, the antenna can only sense an electric field, and cannot extract the amplitude and phase of the sensed electric field, which also requires detection and phase discrimination of the received signal, thereby obtaining the amplitude and phase of the sensed electric field. The application uses a software radio platform comprising a processing core and AD, DA, which has the function of detecting the amplitude and phase of the electric field. Meanwhile, the software radio platform also has vector signal generating and transmitting functions and can be used for generating interference signals. The interference signal is generated according to the specific rule, namely the amplitude and the phase of the same proportion, of the received signal, and the polarization mode of the interference signal is the same as that of the received signal.
Step S4: the transmitting channel amplifies the power of a pair of orthogonal electric field components E Tx and E Ty of the interference signal generated by the software radio level station and transmits the amplified signals to the orthogonal receiving and transmitting antenna.
Step S5: the orthogonal transceiver antenna shared by the transceiver is aligned with the target device in real time, the interference signal is considered as a plane wave propagating along the z-axis direction, and the electric field component E Tx in the x-axis direction and the electric field component E Ty in the y-axis direction of the interference signal are acquired from the transmitting channel and transmitted to the target device. And E Tx and E Ty are transmitted and then subjected to vector synthesis in space to form a polarization mode identical to that of a received signal, so that a transmitting antenna of a radio interference system and a communication antenna of target equipment have the same polarization mode, namely polarization matching is realized, and the optimal interference effect is achieved.
Compared with the prior art, the polarization backtracking radio interference system provided by the application has the following technical innovation.
Firstly, the application adopts a polarization backtracking mode to directly collect and detect a pair of orthogonal electric field components E Rx and E Ry of a normal communication signal of target equipment, and instantly obtain amplitude and phase information of E Rx and E Ry without extracting polarization scattering characteristic parameters. A pair of orthogonal electric field components E Tx and E Ty of the interference signal are formed directly according to the amplitude and phase information of the E Rx and the E Ry, the interference signal is radiated outwards after power matching is carried out, and vector synthesis is carried out in space after the direct transmission of the E Tx and the E Ty, so that the interference signal and the polarization mode of the target equipment are the same, and the optimal interference effect is obtained.
Secondly, the application can be used for carrying out polarization backtracking on any target device after signal reception, and the track of the target device and the position of the target device are not required to be known, so that the polarization backtracking is directly carried out through signal reception. The application can realize the matching of unknown polarization modes, namely is suitable for matching of any polarization modes.
Third, changes in both the pose and position of the target device may result in changes in the relative polarization relationship with the transmitting antenna of the radio interference system. The application can complete polarization matching in the dynamic process by the polarization backtracking technology, and the required time is only the time of signal detection and generation, so that the application can adapt to the quasi-real-time polarization backtracking interference in the dynamic process.
Fourth, the entire receiving link and the entire transmitting link adopted by the polarization backtracking technology of the present application almost share all channels, so that the present application has lower hardware cost; the difference is only a receiving amplifier and a transmitting amplifier in a receiving and transmitting channel, which can be detected in advance by a software radio platform to determine the compensation amount and compensate when in actual use. This ensures that the polarization information of the transmitted signal via the received signal and the retrospective polarization information are almost identical.
The above are only preferred embodiments of the present application, and are not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A radio interference system for polarization backtracking is characterized by comprising an orthogonal receiving and transmitting antenna, a receiving and transmitting channel, a software radio platform, a servo and a rotating mechanism;
The orthogonal receiving and transmitting antenna is an antenna shared by receiving and transmitting, and is formed by combining a vertical polarized antenna and a horizontal polarized antenna; when the orthogonal receiving and transmitting antenna is used for receiving, the orthogonal receiving and transmitting antenna receives an electric field component E Rx in the x-axis direction and an electric field component E Ry in the y-axis direction of a normal communication signal of the target device and sends the electric field components E Ry to a receiving channel; when the orthogonal receiving and transmitting antenna is used for transmitting, the orthogonal receiving and transmitting antenna acquires an electric field component E Tx in the x-axis direction and an electric field component E Ty in the y-axis direction of an interference signal from a transmitting channel and transmits the electric field components E Ty to target equipment;
The receiving and transmitting channels comprise receiving channels and transmitting channels; the receiving channel is provided with two receiving amplifiers which respectively amplify a pair of orthogonal electric field components E Rx and E Ry of signals received by the orthogonal receiving and transmitting antenna; the transmitting channel is provided with two transmitting amplifiers which respectively amplify the power of a pair of orthogonal electric field components E Tx and E Ty of the interference signal generated by the software radio level platform;
The software radio level station detects a received signal sent by a receiving channel, obtains the amplitude and the phase of a pair of orthogonal electric field components E Rx and E Ry of the received signal, regenerates a pair of orthogonal electric field components E Tx and E Ty with the same proportion of amplitude and phase as interference signals, and sends the interference signals to a transmitting channel; the same ratio of the amplitude of E Ty to the amplitude of E Tx is equal to the ratio of the amplitude of E Ry to the amplitude of E Rx, and the same ratio of the phase is equal to the difference between the phase of E Ty and the phase of E Tx and the phase of E Ry and the phase of E Rx;
The servo and rotating mechanism enables the orthogonal receiving and transmitting antenna to be always aligned with the target equipment in a displacement and/or rotation mode.
2. The polarization-retrospective radio interference system according to claim 1, wherein the orthogonal transceiver antenna approximates the normal communication signal of the target device to a plane wave propagating in the z-axis direction when receiving, the horizontal polarization antenna receives the electric field component E Rx in the x-axis direction of the normal communication signal of the target device, and the vertical polarization antenna receives the electric field component E Ry in the y-axis direction of the normal communication signal of the target device;
When the antenna is used for transmitting, the orthogonal receiving and transmitting antenna approximates an interference signal to a plane wave propagating along the z-axis direction, the horizontal polarization antenna transmits an electric field component E Tx along the x-axis direction of the interference signal, and the vertical polarization antenna transmits an electric field component E Ty along the y-axis direction of the interference signal.
3. The polarization-traceback radio interference system of claim 1, wherein the two receive amplifiers have the same amplitude response and the same phase response; the two transmit amplifiers also have the same amplitude response and the same phase response; the same amplitude response refers to: when signals with the same amplitude are input, the output signals also have the same amplitude; the same phase response refers to: when signals of the same phase are input, the output signals also have the same phase.
4. A polarization traceback radio interference system as claimed in claim 3, wherein the transceiving channel comprises two all-two switches, two receive amplifiers, two transmit amplifiers; the first switch and the first receiving amplifier form an x-axis direction receiving channel; the first switch and the first transmitting amplifier form an x-axis direction transmitting channel; the second switch and the second receiving amplifier form a y-axis direction receiving channel; the second switch and the second transmitting amplifier form a y-axis direction transmitting channel; the x-axis direction receiving channel and the y-axis direction receiving channel form a complete receiving channel; the x-axis direction emission channel and the y-axis direction emission channel form a complete emission channel; two all-two switches are used for determining whether the receiving channel works or the transmitting channel works at a certain moment, and only one of the receiving channel and the transmitting channel works at any moment; when the receiving channel works, the two receiving amplifiers amplify signals of E Rx and E Ry respectively; when the transmit channel is in operation, the two transmit amplifiers power amplify E Tx and E Ty, respectively.
5. The polarization-retrospective radio interference system of claim 1, wherein the software radio platform causes the interference signal to have the same polarization as the received signal by generating the interference signal to have the same proportional amplitude and phase as the received signal, such that the transmit antenna of the radio interference system and the communication antenna of the target device have the same polarization.
6. The polarization retrospective radio interference system of claim 1, wherein the software radio level stage comprises a processing core; the processing core specifically comprises a baseband signal generation module, an amplitude-phase calculation module and an interference signal generation module; the baseband signal generation module is used for generating a baseband signal of the interference signal; The amplitude and phase calculation module is used for detecting and calculating the amplitude and phase of E Rx and E Ry to obtain the relative amplitude of E Rx and E Ry, and the relative phases of E Rx and E Ry; The interference signal generating module is used for generating a pair of quadrature electric field components E Tx and E Ty according to the baseband signal of the interference signal and the relative amplitudes and phases of E Rx and E Ry, The resulting requirement is that the ratio of the amplitude of E Ty to the amplitude of E Tx is equal to the ratio of the amplitude of E Ry to the amplitude of E Rx, And the difference between the phase of E Ty and the phase of E Tx is equal to the difference between the phase of E Ry and the phase of E Rx; E Tx is an electric field component in the x-axis direction of the interference signal, E Ty is an electric field component in the y-axis direction of the interference signal, and spatial synthesis of the two forms the interference signal.
7. The polarization-retrospective radio interference system of claim 6 wherein the software-defined radio platform further comprises two analog-to-digital converters for converting the amplified analog versions of E Rx and E Ry of the receive channel, respectively, to digital versions, the two analog-to-digital converters having the same amplitude response and the same phase response;
The software defined radio platform further includes two digital-to-analog converters for converting the digital forms E Tx and E Ty generated by the processing core to analog forms, respectively, the two digital-to-analog converters having the same amplitude response and the same phase response.
8. The polarization retrospective radio interference system of claim 7, wherein the analog-to-digital converter and digital-to-analog converter are integrated on the same chip; the whole receiving link and the whole transmitting link are only different from each other in a receiving amplifier and a transmitting amplifier in a receiving-transmitting channel, and the processing core corrects and compensates the inconsistency between Gx and Gy; gx refers to the amplitude and phase response from E Rx to E Tx, gy refers to the amplitude and phase response from E Ry to E Ty.
9. The radio interference system of claim 1, wherein the radar detects the position of the target device in real time and provides an azimuth angle and a pitch angle of the target device, and the servo and rotation mechanism adjusts the pointing angle of the orthogonal transmit-receive antenna according to the azimuth angle and the pitch angle of the target device provided by the radar, so that the orthogonal transmit-receive antenna keeps pointing to the target device in real time.
10. A radio interference method for polarization backtracking, comprising the steps of;
Step S1: the orthogonal receiving and transmitting antenna shared by receiving and transmitting is aligned to the target equipment in real time, receives an electric field component E Rx in the x-axis direction and an electric field component E Ry in the y-axis direction of a normal communication signal of the target equipment and sends the electric field components E Ry to a receiving channel;
Step S2: the receiving channel amplifies signals of a pair of orthogonal electric field components E Rx and E Ry of signals received by the orthogonal receiving and transmitting antenna and sends the amplified signals to the software radio platform;
Step S3: the software radio level platform detects a receiving signal sent by a receiving channel, obtains the amplitude and the phase of a pair of orthogonal electric field components E Rx and E Ry in the receiving signal, regenerates a pair of orthogonal electric field components E Tx and E Ty with the same proportion of amplitude and phase as interference signals, and sends the interference signals to a transmitting channel; the same ratio of the amplitude of E Ty to the amplitude of E Tx is equal to the ratio of the amplitude of E Ry to the amplitude of E Rx, and the same ratio of the phase is equal to the difference between the phase of E Ty and the phase of E Tx and the phase of E Ry and the phase of E Rx;
Step S4: the transmitting channel amplifies the power of a pair of orthogonal electric field components E Tx and E Ty of the interference signal generated by the software radio level station and then transmits the amplified power to the orthogonal receiving and transmitting antenna;
Step S5: the orthogonal receiving and transmitting antenna shared by receiving and transmitting is aligned to the target equipment in real time, an electric field component E Tx in the x-axis direction and an electric field component E Ty in the y-axis direction of the interference signal are obtained from a transmitting channel and transmitted to the target equipment, and the interference signal with the same polarization mode as the received signal is formed through spatial synthesis after the E Tx and the E Ty are transmitted.
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