CN114204958A - Radio frequency receiving and transmitting assembly, digital array system and anti-interference method thereof - Google Patents
Radio frequency receiving and transmitting assembly, digital array system and anti-interference method thereof Download PDFInfo
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- CN114204958A CN114204958A CN202111537526.XA CN202111537526A CN114204958A CN 114204958 A CN114204958 A CN 114204958A CN 202111537526 A CN202111537526 A CN 202111537526A CN 114204958 A CN114204958 A CN 114204958A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a radio frequency transceiving component, a digital array system and an anti-interference method thereof, wherein the radio frequency transceiving component comprises a radio frequency transmitting channel, a radio frequency receiving channel, a first switching module, a second switching module and a load, wherein the input end of the first switching module is connected with an antenna, the first output end of the first switching module is connected with the transmitting output end of the radio frequency transmitting channel, the second output end of the first switching module is connected with the receiving input end of the radio frequency receiving channel, the input end of the second switching module is connected with the switching output end of the radio frequency receiving channel, the first output end of the second switching module is connected with the receiving output end, and the second output end of the second switching module is grounded after passing through the load connected in series. In the radio frequency transceiving component, the first switching module with the input end connected with the antenna only needs two output ends, an alternative switch can be adopted instead of a traditional three-alternative switch, the insertion loss of the alternative switch is relatively lower, and the antenna transmitting output power is improved and the receiving noise coefficient is reduced.
Description
Technical Field
The invention relates to the technical field of radio frequency, in particular to a radio frequency transceiving component, a digital array system and an anti-interference method thereof.
Background
The array system is composed of thousands of radio frequency transceiver modules (also called T/R modules), each of which is a minimum array unit. The switching between the receiving channel and the transmitting channel of the rf transceiver module is usually realized by an rf transceiver switch connected to an antenna, and the rf transceiver switch is also one of the key devices constituting the rf transceiver module. The array system usually needs to calibrate the amplitude-frequency characteristics and the phase-frequency characteristics of the receiving channel and the transmitting channel of each array unit, and in the calibration process of the receiving and transmitting channels, some channels need to be silent in receiving and transmitting and are in a matching state. Therefore, one end of the one-out-of-three radio frequency switch is connected with the antenna, and the other three ends of the one-out-of-three radio frequency switch are respectively connected with the power amplifier of the transmitting channel, the limiting amplifier of the receiving channel and the load which is grounded.
However, the one-out-of-three rf switch often has higher insertion loss, which results in larger power loss after the power amplifier output power passes through the rf switch during transmission, i.e. the transmission efficiency of the component becomes lower; on the other hand, in the receiving process, the increase of the switching loss after the radio frequency switch of one-out-of-three is adopted can directly deteriorate the receiving noise coefficient, thereby reducing the sensitivity of the receiver.
Therefore, under the condition that the array system needs the channel with the transceiving silence function in the matching state, how to further improve the transmission efficiency and the receiving sensitivity of the radio frequency transceiving component becomes a technical problem which needs to be solved urgently.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a solution for a radio frequency transceiver module to improve the transmission efficiency and the receiving sensitivity of the radio frequency transceiver module.
To achieve the above and other related objects, the present invention provides the following technical solutions.
A radio frequency transceiving component comprises a radio frequency transmitting channel, a radio frequency receiving channel, a first switching module, a second switching module and a load, wherein the input end of the first switching module is connected with an antenna, the first output end of the first switching module is connected with the transmitting output end of the radio frequency transmitting channel, the second output end of the first switching module is connected with the receiving input end of the radio frequency receiving channel, the input end of the second switching module is connected with the switching output end of the radio frequency receiving channel, the first output end of the second switching module is connected with the receiving output end, and the second output end of the second switching module is grounded after passing through the loads connected in series; the first switching module is used for switching control of the radio frequency transmitting channel and the radio frequency receiving channel, and the second switching module is used for switching control of a silent matching state and a receiving state of the radio frequency receiving channel.
Optionally, the radio frequency transmission channel at least includes a transmission input terminal, a power amplifier, and the transmission output terminal, which are connected in sequence.
Optionally, the radio frequency receiving channel at least includes the receiving input terminal, the limiter, the low noise amplifier, and the switching output terminal, which are connected in sequence.
The utility model provides an anti-interference digital array system, includes N radio frequency transceiver unit, digital signal processor and the light transceiver unit that is the array setting, digital signal processor and N radio frequency transceiver unit connect, through digital signal processor is to every radio frequency transceiver unit's received signal carries out phase place regulation, amplitude control with the transmitted signal, radio frequency transceiver unit includes antenna and above-mentioned radio frequency transceiver component, radio frequency transceiver component with the antenna is connected, the one end and the digital signal processor of light transceiver unit are connected, another termination optic fibre of light transceiver processor, N is more than or equal to 2's integer.
Optionally, the radio frequency transceiver unit further includes a third switching module, a first switch filter bank, a first tunable filter, a fourth switching module, a tunable trap, a radio frequency interference canceller, and an analog-to-digital converter, the input end of the third switching module is connected with the receiving output end of the radio frequency receiving channel, the first output end of the third switching module is connected with the first input end of the fourth switching module after passing through the first switch filter bank connected in series, the second output end of the third switching module is connected with the second input end of the fourth switching module after passing through the first tunable filter connected in series, a third output end of the third switching module is connected with a third input end of the fourth switching module through a first through path, the output end of the fourth switching module is connected with the digital signal processor after passing through the tunable wave trap, the radio frequency interference canceller and the analog-to-digital converter which are sequentially connected in series.
Optionally, the radio frequency transceiver unit further includes a sampling and protection switching structure connected in series between the radio frequency interference canceller and the analog-to-digital converter, the sampling and protection switching structure includes a fifth switching module, a sampling holder and a sixth switching module, an input end of the fifth switching module is connected to an output end of the radio frequency interference canceller, a first output end of the fifth switching module is connected to a first input end of the sixth switching module through a second through path, a second output end of the fifth switching module is connected to a second input end of the sixth switching module through the sampling holder connected in series, and an output end of the sixth switching module is connected to an input end of the analog-to-digital converter.
Optionally, the radio frequency interference canceller includes a coupler and a first digital-to-analog converter, an input end of the coupler is connected to an output end of the tunable trap, an output end of the coupler is connected to an input end of the fifth switching module, a coupling end of the coupler is connected to an output end of the first digital-to-analog converter, and an input end of the first digital-to-analog converter is connected to the digital signal processor.
Optionally, the radio frequency transceiver unit further includes a seventh switching module, a second switch filter bank, a second tunable filter, an eighth switching module, and a second digital-to-analog converter, an output end of the seventh switching module is connected to a transmission input end of the radio frequency transmission channel, a first input end of the seventh switching module is connected to a first output end of the eighth switching module after passing through the second switch filter bank connected in series, a second input end of the seventh switching module is connected to a second output end of the eighth switching module after passing through the second tunable filter connected in series, a third input end of the seventh switching module is connected to a third output end of the eighth switching module after passing through a third through path, and an input end of the eighth switching module is connected to the digital signal processor after passing through the second digital-to-analog converter connected in series.
An anti-interference method for a digital array system comprises the following steps:
providing the digital array system, and calibrating a receiving and transmitting channel and various hardware of the digital array system;
switching the digital array system to a receiving state, suppressing out-of-band interference signals through the first switch filter bank or the first tunable filter bank, and suppressing the interference signals of known frequency points through the tunable trap;
performing signal parameter identification analysis on the residual interference signals output by the analog-to-digital converter in a digital domain through the digital signal processor;
generating a corresponding digital cancellation signal through the digital signal processor according to the analyzed and identified residual interference signal, inputting the digital cancellation signal into the first digital-to-analog converter, generating a radio frequency cancellation signal through the first digital-to-analog converter, wherein the radio frequency cancellation signal enters a receiving link through the coupler and cancels the residual interference signal;
the signal parameters at least comprise frequency, a modulation mode and a frequency hopping pattern.
Optionally, the anti-interference operating method of the digital array system further includes:
and controlling the trap frequency of the tunable trap by the digital signal processor according to the analyzed and identified frequency of the residual interference signal, and suppressing the residual interference signal of the corresponding frequency by the tunable trap.
As described above, the radio frequency transceiving module, the digital array system and the anti-interference method thereof provided by the present invention have at least the following advantages:
the first switching module with the input end connected with the antenna only needs two output ends, namely an alternative switch rather than a traditional one-out-of-three switch can be adopted, the insertion loss of the first switching module is relatively lower, and the first switching module is beneficial to improving the transmitting output power of the antenna and reducing the receiving noise coefficient; the radio frequency transceiving component can realize a low-loss and high-power all-digital array, can realize the independent silent function of each channel through the control cooperation of the two alternative switches, and is beneficial to the calibration of system channels and the flexible switching of multiple functions of the digital array.
Drawings
Fig. 1 is a circuit diagram of a radio frequency transceiver module in the prior art.
Fig. 2 is a circuit structure diagram of the rf transceiver module according to the present invention.
Fig. 3 is a circuit structure diagram of the anti-interference digital array system of the present invention.
Description of the reference numerals
U1-switching module, U2-first switching module, U3-second switching module, U4-third switching module, U5-fourth switching module, U6-seventh switching module, U7-eighth switching module, U8-ninth switching module, R-load, A1-power amplifier, A2-amplitude limiter, A3-low noise amplifier, ADC-analog-to-digital converter, DAC 1-first digital-to-analog converter, DAC 2-second digital-to-analog converter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 3. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of each component in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated. The structures, proportions, and dimensions shown in the drawings and described in the specification are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, so as not to obscure the disclosure with details that will be readily apparent to those skilled in the art, and it is not intended to limit the scope of the present invention to the exact construction and modification, or changes in the proportions and dimensions, without affecting the efficacy and attainment of the same.
When studying the existing radio frequency transceiving component, the inventor studies and finds that: in the calibration process of the transceiving channel, a one-out-of-three switching module U1 is generally adopted to gate the antenna to a grounded load end R, as shown in fig. 1, one end of the one-out-of-three switching module U1 is connected to the antenna, the other three ends are respectively connected to a power amplifier a1 of the transmitting channel, and a limiter a2 of the receiving channel and the grounded load R; however, the one-out-of-three switching module U1 tends to have higher insertion loss, which results in larger power loss after the power amplifier output power passes through the rf switch during transmission, i.e. the component transmission efficiency becomes lower, and during reception, the increase of loss after the one-out-of-three switching module U1 is adopted directly deteriorates the reception noise figure, thereby reducing the receiver sensitivity.
Based on this, the invention provides an improved technical scheme of a radio frequency transceiving component, which comprises the following steps: two alternative switching modules are adopted to replace the traditional three alternative switching module, and the insertion loss of the alternative switching module is relatively low, so that the transmitting output power of the antenna is improved, and the receiving noise coefficient is reduced.
In detail, as shown in fig. 2, the present invention provides a radio frequency transceiver module, which includes a radio frequency transmitting channel, a radio frequency receiving channel, a first switching module U2, a second switching module U3 and a load R, wherein an input end of the first switching module U2 is connected to an antenna, a first output end of the first switching module U2 is connected to a transmitting output end of the radio frequency transmitting channel, a second output end of the first switching module U2 is connected to a receiving input end of the radio frequency receiving channel, an input end of the second switching module U3 is connected to a switching output end of the radio frequency receiving channel, a first output end of the second switching module U3 is connected to a receiving output end, and a second output end of the second switching module U3 is grounded after passing through the load R connected in series; the first switching module U2 is used for switching control between the rf transmitting channel and the rf receiving channel, and the second switching module U3 is used for switching control between the silent matching state and the receiving state of the rf receiving channel.
In more detail, as shown in fig. 2, the rf transmission channel at least includes a transmission input terminal, a power amplifier a1 and a transmission output terminal connected in sequence. The rf transmit path uses baseband signals (voice, video, data or other information) to modulate an intermediate frequency sine wave signal, then the intermediate frequency signal is moved up to the desired rf transmit frequency by a mixer, and the power amplifier a1 is used to increase the output power of the transmitter and drive an antenna to convert the modulated carrier signal into an electromagnetic wave that can propagate in free space.
The power amplifier a1 is the main part of the transmitting system, and in the front-stage circuit of the transmitter, the power of the radio frequency signal generated by the modulation oscillating circuit is very small, and it needs to be amplified by a series of times to obtain enough radio frequency power before being fed to the antenna to radiate. In order to obtain a sufficiently large radio frequency output power, a power amplifier must be employed. After the modulator generates the rf signal, the rf modulated signal is amplified to sufficient power by power amplifier a1, passed through a matching network, and transmitted by the antenna.
It should be noted that the radio frequency transmission channel further includes other devices such as a modulator, an intermediate frequency filter, a local oscillator, a mixer, a band pass filter, etc., and the detailed structure may refer to the prior art and is not described herein again.
In more detail, as shown in fig. 2, the rf receiving channel at least includes a receiving input terminal, a limiter a2, a low noise amplifier A3 and a switching output terminal, which are connected in sequence.
The rf receive path is the inverse of the rf transmit path, the antenna will receive electromagnetic waves from many sources over a relatively wide frequency range, the limiter a2 (or bandpass filter) filters out unwanted received signals, the low noise amplifier A3 then amplifies the potentially received weak signals and minimizes the noise impact into the received signals, the mixer then down-converts the received rf signals to a lower frequency, and the if amplifier will boost the power level of the signals to facilitate coordination and to obtain information.
It should be noted that the radio frequency receiving channel further includes other devices such as a local oscillator, a mixer, an intermediate frequency filter, an intermediate frequency amplifier, a demodulator, and the like, and the detailed structure may refer to the prior art and is not described herein again.
In more detail, as shown in fig. 2, each of the first switching module U2 and the second switching module U3 includes an alternative switch, which may be an analog switch based on CMOS process, GaAs process, GaN process, etc., such as ET3157, ADG619/ADG 620.
In an alternative embodiment of the present invention, the whole rf transceiver module is packaged in a 3D stacked form. In the traditional radio frequency transceiving assembly, a circuit substrate and a metal shell are separated, the circuit substrate is welded on the metal shell, chips, components and the like are welded on the circuit substrate, and then the metal shell is sealed and hermetically packaged. The circuit substrate is of a two-dimensional plane structure, the transverse size of the final assembly is large, and the metal shell is difficult to be made small in weight and size, so that the traditional assembly cannot meet the requirements of high integration, light weight and miniaturization of modern radars and communication equipment. Therefore, in the embodiment of the invention, the 3D stack package is implemented on the circuit substrate, and various chips and components are arranged on the circuit substrate in an up-and-down overlapping manner. So as to reduce the transverse dimension of the radio frequency transceiving component and realize the structure miniaturization and high integration density design.
In more detail, as shown in fig. 2, the operation principle of the rf transceiver module is as follows:
1) when transmitting, the first output end of the first switching module U2 is conducted with the input end thereof, the second output end of the second switching module U3 is conducted with the input end thereof, the power amplifier A1 on the radio frequency transmitting channel is in a working state, a transmitting signal is transmitted and propagated outwards after passing through the radio frequency transmitting channel and the antenna, and the low noise amplifier A3 on the radio frequency receiving channel is in a power-off state;
2) during receiving, the second output end of the first switching module U2 is conducted with the input end thereof, the first output end of the second switching module U3 is conducted with the input end thereof, the low noise amplifier A3 on the radio frequency receiving channel is in a working state, the received signal is output to the post-processing circuit through the antenna and the radio frequency receiving channel, and the power amplifier a1 on the radio frequency transmitting channel is in a power-off state;
3) during silence, the second output terminal of the first switching module U2 is conducted with its input terminal, the second output terminal of the second switching module U3 is conducted with its input terminal, the low noise amplifier A3 on the radio frequency receiving channel is in a working state, the power amplifier a1 on the radio frequency transmitting channel is in a power-off state, the low noise amplifier A3 on the radio frequency receiving channel is in a working state to ensure that the radio frequency receiving channel is in a good matching state, if the low noise amplifier A3 does not work due to power-off, the whole link will be in a mismatch state, the antenna will also be in a mismatch state, and the requirement of system calibration is not satisfied.
Compared with the prior art, the first switching module U2 with the input end connected with the antenna only needs two output ends, namely, an alternative switch can be adopted instead of the traditional alternative switch, the insertion loss of the alternative switch is relatively lower, and the antenna transmission output power is improved and the receiving noise coefficient is reduced; on the other hand, the second switching module U3, which is disposed after the low noise amplifier A3 of the rf receiving channel, brings about insertion loss, but because it is at the output of the low noise amplifier A3, and has a certain gain, the insertion loss hardly deteriorates the noise figure.
In an optional embodiment of the present invention, experiments prove that, in the Ku band, the insertion loss of the two-out-of-one switch is lower than that of the three-out-of-one switch by about 0.5dB, so that by adopting the technical scheme of the present invention, the reception noise coefficient can be reduced by about 0.5dB, and the transmission output power can be improved by about 0.5 dB.
In addition, the present invention further provides a digital array system, as shown in fig. 3, which includes N radio frequency transceiver units arranged in an array, a digital signal processor and an optical transceiver processor, wherein the digital signal processor is connected to the N radio frequency transceiver units, phase adjustment and amplitude adjustment are performed on a received signal and a transmitted signal of each radio frequency transceiver unit through the digital signal processor, and a digital multi-beam function capable of adaptive control is supported, the radio frequency transceiver unit includes an antenna and the radio frequency transceiver component, the radio frequency transceiver component is connected to the antenna, one end of the optical transceiver processor is connected to the digital signal processor, the other end of the optical transceiver processor is connected to an optical fiber, and signals such as a data stream and a control stream are output through the optical transceiver processor by using the optical fiber, where N is an integer greater than or equal to 2.
Optionally, the digital array system further includes an electromagnetic shielding structure, and the electromagnetic shielding structure isolates spatial coupling between the radio frequency transceiver components, so that electromagnetic shielding between the radio frequency transceiver components is realized, and electromagnetic stability of the radio frequency transceiver components is improved.
In an alternative embodiment of the present invention, the electromagnetic shielding structure includes electromagnetic shielding walls distributed in a grid shape, and each grid is provided with one radio frequency transceiver component.
In detail, as shown in fig. 3, on the receiving link of each rf transceiver unit, the rf transceiver unit further includes a third switching module U4, a first switch filter bank, a first tunable filter, a fourth switching module U5, a tunable trap, a radio frequency interference canceller, and an analog-to-digital converter (ADC), an input end of the third switching module U4 is connected to a receiving output end of the rf receiving channel, a first output end of the third switching module U4 is connected to a first input end of the fourth switching module U5 through the first switch filter bank connected in series, a second output end of the third switching module U4 is connected to a second input end of the fourth switching module U5 through the first tunable filter connected in series, a third output end of the third switching module U4 is connected to a third input end of the fourth switching module U5 through the first through-way, and an output end of the fourth switching module U5 is connected to the tunable trap and the ADC sequentially connected in series, The radio frequency interference canceller and the analog-to-digital converter are connected with the digital signal processor.
In more detail, as shown in fig. 3, on the receiving link of each rf transceiver unit, various modulated spurious signals or wideband noise in the received signal are suppressed or filtered through the first switch filter bank, the first tunable filter, the tunable trap, and the rf interference canceller.
The first switch filter bank and the first tunable filter can be connected in parallel through a third switching module U4 (radio frequency switch) and a fourth switching module U5 (radio frequency switch), so as to realize more flexible reconfigurable frequency-selecting mode configuration; the reconfigurable frequency selection mode comprises the reconfigurable performance of medium frequency, working bandwidth, rectangular coefficient, out-of-band rejection, insertion loss and the like. When the first switch filter bank and the first tunable filter are connected in parallel through the radio frequency switch (the third switching module U4 and the fourth switching module U5), a first through path connected in parallel is further set through the radio frequency switch, and when the radio frequency switch selects the first through path, the first switch filter bank and the first tunable filter are not connected to the receiving link, so that large-bandwidth radio frequency receiving is realized.
It is understood that the first switch filter bank and the first tunable filter may also be arranged in series to achieve higher spurious suppression performance, and details can be referred to in the prior art and are not described herein again.
In more detail, as shown in fig. 3, on the receiving link of each radio frequency transceiver unit, the tunable trap is located before the radio frequency interference canceller, and the received signal is filtered by the tunable trap to the known interference signal, and then the known and/or unknown interference signal is further suppressed by the radio frequency interference canceller.
In more detail, as shown in fig. 3, on the receiving link of each rf transceiver unit, the rf transceiver unit further includes a sampling and protection switching structure connected in series between the rf interference canceller and the analog-to-digital converter, the sampling and protection switching structure includes a fifth switching module U6, a sampling holder and a sixth switching module U7, an input end of the fifth switching module U6 is connected to an output end of the rf interference canceller, a first output end of the fifth switching module U6 is connected to a first input end of the sixth switching module U7 through a second through path, a second output end of the fifth switching module U6 is connected to a second input end of the sixth switching module U7 through the serially connected sampling holder, and an output end of the sixth switching module U7 is connected to an input end of the analog-to-digital converter.
The ultra-wideband high-speed sampling holder is arranged between the analog-to-digital converter and the radio frequency interference canceller, and the sampling holder is used for realizing the direct sampling and receiving of the large-bandwidth radio frequency; similarly, the situation that sampling reception is not required is not excluded, and based on this, a second through path arranged in parallel with the sampling holder arrangement may be added through the rf switch (the fifth switching module U6 and the sixth switching module U7), and when the rf switch (the fifth switching module U6 and the sixth switching module U7) gates the second through path, the sampling holder does not access the receiving link.
In more detail, as shown in fig. 3, on the receiving link of each rf transceiver unit, the rf interference canceller is located after the tunable filter and before the analog-to-digital converter, and after the first switch filter bank and/or the first tunable filter suppress various modulated spurious signals or wideband noise, the cancellation process is performed.
The radio frequency interference canceller comprises a coupler and a first digital-to-analog converter (DAC1), the input end of the coupler is connected with the output end of the tunable trap, the output end of the coupler is connected with the input end of the fifth switching module U6, the coupling end of the coupler is connected with the output end of the first digital-to-analog converter, and the input end of the first digital-to-analog converter is connected with the digital signal processor.
Further, based on the digital array system, the invention also provides an anti-interference method of the digital array system, which comprises the following steps:
s1, providing the digital array system, and calibrating the digital array system with a transmitting and receiving channel and various hardware;
s2, switching the digital array system to a receiving state, suppressing the out-of-band interference signal through a first switch filter bank or a first tunable filter bank, and suppressing the interference signal of the known frequency point through a tunable trap;
s3, performing signal parameter identification analysis on the residual interference signal output by the analog-digital converter in a digital domain through the digital signal processor;
and S4, generating a corresponding digital cancellation signal through the digital signal processor according to the analyzed and identified residual interference signal, inputting the digital cancellation signal into the first digital-to-analog converter, generating a radio frequency cancellation signal through the first digital-to-analog converter, and enabling the radio frequency cancellation signal to enter the receiving link through the coupler and cancel the residual interference signal.
In detail, the various types of calibration in step S1 include that the phase offset introduced by the coupler needs to be considered when calculating the phase of the radio frequency cancellation signal, and advance calibration needs to be performed; the radio frequency cancellation signal and the radio frequency interference signal are two signals with identical parameters such as amplitude, modulation and the like except for 180 degrees of phase difference.
In detail, in step S2, the interference signal includes a high-power rf modulation interference signal and a wideband noise interference signal, the received signal passes through the first switch filter bank or the first tunable filter bank, or directly passes through the first through path for the wideband received signal without performing filtering processing, the received signal passes through the tunable trap and the coupler of the rf interference canceller in sequence and then is converted into a digital signal by the analog-to-digital converter, and at this time, the first digital-to-analog converter of the rf interference canceller does not output any signal.
In detail, in step S3, the remaining interference signal output by the analog-to-digital converter is subjected to fast identification and analysis of signal parameters such as frequency, modulation mode, frequency hopping pattern, etc. in the digital domain by the digital signal processor, including methods such as comparison with an existing data model base or deep learning based data analysis and mining.
In detail, in step S4, according to the analyzed and identified remaining interference signals, a digital signal processor generates corresponding digital cancellation signals, and inputs the digital cancellation signals into a radio frequency interference canceller, and the radio frequency interference canceller generates radio frequency cancellation signals, and cancels the radio frequency cancellation signals and the remaining interference signals in the received signals, thereby achieving the purpose of enhancing the anti-interference of the system.
Optionally, based on the set tunable trap, the method for operating the digital array system in an interference-free manner further includes:
and S5, controlling the trap frequency of the tunable trap filter through the digital signal processor according to the frequency of the residual interference signal identified by analysis, and suppressing the residual interference signal of the corresponding frequency through the tunable trap filter.
In more detail, as shown in fig. 3, on the receiving link of each rf transceiver unit, the received signal with various types of modulation spurious signals or wideband noise removed is finally converted into a digital signal by an analog-to-digital converter, and is then transmitted to a digital signal processor for subsequent processing.
The analog-to-digital converter has the characteristic of large spurious-free dynamic range and large dynamic receiving capacity, and typically, the spurious-free dynamic range is 60-70 dB, so that an additional automatic gain control radio frequency/intermediate frequency circuit is not required to be designed in the radio frequency transceiving component; the analog-to-digital converter has the characteristics of high speed and high precision, can realize direct sampling of radio frequency signals without frequency mixing, and typically has a sampling rate of 10-18 GSPS and effective bits of 6-10.
In detail, as shown in fig. 3, on the transmission link of each rf transceiver unit, the rf transceiver unit further includes a seventh switching module U8, a second switch filter bank, a second tunable filter, an eighth switching module U9, and a second digital-to-analog converter (DAC2), an output end of the seventh switching module U8 is connected to a transmission input end of the rf transmission channel, a first input end of the seventh switching module U8 is connected to a first output end of the eighth switching module U9 through the second switch filter bank connected in series, a second input end of the seventh switching module U8 is connected to a second output end of the eighth switching module U9 through the second tunable filter connected in series, a third input end of the seventh switching module U8 is connected to a third output end of the eighth switching module U9 through a third through path, and an input end of the eighth switching module U9 is connected to the digital signal processor through the second digital-to-analog converter connected in series.
In detail, as shown in fig. 3, on the transmission link of each rf transceiver unit, a second switch filter bank and a second tunable filter are disposed between the second digital-to-analog converter and the rf transmission input end, and the second switch filter bank and the second tunable filter suppress out-of-band spurious signals of the transmission signal.
In more detail, as shown in fig. 3, similar to the receiving link, the second switch filter bank and the second tunable filter may be arranged in parallel through the radio frequency switch (the seventh switching module U8 and the eighth switching module U9) to implement a more flexible reconfigurable frequency-selective mode configuration, and a third pass-through path connected in parallel is further arranged through the radio frequency switch (the seventh switching module U8 and the eighth switching module U9), and when the radio frequency switch selects the third pass-through path, the second switch filter bank and the second tunable filter are not connected to the transmitting link, so as to implement large-bandwidth radio frequency transmission.
In detail, as shown in fig. 3, on the transmission link of each rf transceiver unit, the digital signal transmitted by the digital signal processor is converted into an analog signal by the second digital-to-analog converter, and the analog signal is filtered by the second switch filter bank and the second tunable filter to remove the spurious signal, and then is transmitted to the outside through the rf transmission channel and the antenna.
The second digital-to-analog converter is internally provided with a GaN amplifier functional unit and can output high-power radio-frequency signals. Typically, the output power is 20-30 dBm, for example, to drive the power amplifier A1 in the RF transceiver module.
In summary, in the rf transceiver module provided in the present invention, the first switching module, of which the input end is connected to the antenna, only needs two output ends, that is, it can use an alternative switch instead of the conventional one-out-of-three switch, and its insertion loss is relatively lower, which is helpful to improve the antenna transmission output power and reduce the reception noise coefficient; the radio frequency transceiving component can realize a low-loss and high-power all-digital array, can realize the independent silent function of each channel through the control and matching of two alternative switches, and is beneficial to the calibration of system channels and the flexible switching of multiple functions of the digital array; in the anti-interference digital array system provided by the invention, the receiving link and the transmitting link are both provided with the switch filter bank and the tunable filter for removing stray signals and suppressing noise, so that the anti-interference receiving capacity and the spectrum purity of the transmitting signals can be further improved; in addition, a radio frequency interference canceller is also arranged on the receiving link, and the receiving anti-interference capacity is further improved through the radio frequency interference canceller.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A radio frequency transceiving component is characterized by comprising a radio frequency transmitting channel, a radio frequency receiving channel, a first switching module, a second switching module and a load, wherein the input end of the first switching module is connected with an antenna, the first output end of the first switching module is connected with the transmitting output end of the radio frequency transmitting channel, the second output end of the first switching module is connected with the receiving input end of the radio frequency receiving channel, the input end of the second switching module is connected with the switching output end of the radio frequency receiving channel, the first output end of the second switching module is connected with the receiving output end, and the second output end of the second switching module is grounded after passing through the load connected in series; the first switching module is used for switching control of the radio frequency transmitting channel and the radio frequency receiving channel, and the second switching module is used for switching control of a silent matching state and a receiving state of the radio frequency receiving channel.
2. The rf transceiver component of claim 1, wherein the rf transmission channel comprises at least a transmission input terminal, a power amplifier and the transmission output terminal connected in sequence.
3. The rf transceiver component of claim 1 or 2, wherein the rf receiving channel comprises at least the receiving input, the limiter, the low noise amplifier and the switching output, which are connected in sequence.
4. A digital array system is characterized by comprising N radio frequency transceiving units arranged in an array, a digital signal processor and an optical transceiving processor, wherein the digital signal processor is connected with the N radio frequency transceiving units, the digital signal processor is used for carrying out phase adjustment and amplitude adjustment on a received signal and a transmitted signal of each radio frequency transceiving unit, the radio frequency transceiving units comprise an antenna and a radio frequency transceiving component as claimed in claim 3, the radio frequency transceiving component is connected with the antenna, one end of the optical transceiving processor is connected with the digital signal processor, the other end of the optical transceiving processor is connected with an optical fiber, and N is an integer greater than or equal to 2.
5. The digital array system of claim 4, wherein the radio frequency transceiver unit further comprises a third switch module, a first switch filter bank, a first tunable filter, a fourth switch module, a tunable trap, a radio frequency interference canceller, and an analog-to-digital converter, wherein an input of the third switch module is connected to a receiving output of the radio frequency receiving channel, a first output of the third switch module is connected to a first input of the fourth switch module through the first switch filter bank, a second output of the third switch module is connected to a second input of the fourth switch module through the first tunable filter, a third output of the third switch module is connected to a third input of the fourth switch module through a first pass-through path, and an output of the fourth switch module is connected to a third input of the fourth switch module through the tunable trap, the analog-to-digital converter, and the analog-to-digital converter, The radio frequency interference canceller and the analog-to-digital converter are connected with the digital signal processor.
6. The digital array system of claim 5, wherein the radio frequency transceiver unit further includes a sampling and protection switching structure connected in series between the radio frequency interference canceller and the analog-to-digital converter, the sampling and protection switching structure includes a fifth switching module, a sampling holder and a sixth switching module, an input terminal of the fifth switching module is connected to an output terminal of the radio frequency interference canceller, a first output terminal of the fifth switching module is connected to a first input terminal of the sixth switching module through a second pass-through path, a second output terminal of the fifth switching module is connected to a second input terminal of the sixth switching module through the sampling holder connected in series, and an output terminal of the sixth switching module is connected to an input terminal of the analog-to-digital converter.
7. The digital array system of claim 6, wherein the radio frequency interference canceller comprises a coupler and a first digital-to-analog converter, an input terminal of the coupler is connected to the output terminal of the tunable trap, an output terminal of the coupler is connected to the input terminal of the fifth switching module, a coupling terminal of the coupler is connected to the output terminal of the first digital-to-analog converter, and an input terminal of the first digital-to-analog converter is connected to the digital signal processor.
8. The digital array system of claim 7, wherein the RF transceiver unit further comprises a seventh switch module, a second switch filter bank, a second tunable filter, an eighth switch module, and a second digital-to-analog converter, the output end of the seventh switching module is connected with the transmitting input end of the radio frequency transmitting channel, the first input end of the seventh switching module is connected with the first output end of the eighth switching module after passing through the second switch filter bank which is connected in series, a second input end of the seventh switching module is connected with a second output end of the eighth switching module after passing through the second tunable filter connected in series, a third input end of the seventh switching module is connected with a third output end of the eighth switching module through a third through path, the input end of the eighth switching module is connected with the digital signal processor after passing through the second digital-to-analog converter connected in series.
9. An anti-interference method for a digital array system, comprising:
providing the digital array system of claim 8, and calibrating the digital array system for the transmit-receive channel and various types of hardware;
switching the digital array system to a receiving state, suppressing out-of-band interference signals through the first switch filter bank or the first tunable filter bank, and suppressing the interference signals of known frequency points through the tunable trap;
performing signal parameter identification analysis on the residual interference signals output by the analog-to-digital converter in a digital domain through the digital signal processor;
generating a corresponding digital cancellation signal through the digital signal processor according to the analyzed and identified residual interference signal, inputting the digital cancellation signal into the first digital-to-analog converter, generating a radio frequency cancellation signal through the first digital-to-analog converter, wherein the radio frequency cancellation signal enters a receiving link through the coupler and cancels the residual interference signal;
the signal parameters at least comprise frequency, a modulation mode and a frequency hopping pattern.
10. The method of claim 9, wherein the method further comprises:
and controlling the trap frequency of the tunable trap by the digital signal processor according to the analyzed and identified frequency of the residual interference signal, and suppressing the residual interference signal of the corresponding frequency by the tunable trap.
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