CN113452393A - Single-channel radio frequency anti-saturation device and method based on FBAR filtering delay structure - Google Patents

Single-channel radio frequency anti-saturation device and method based on FBAR filtering delay structure Download PDF

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CN113452393A
CN113452393A CN202110729655.2A CN202110729655A CN113452393A CN 113452393 A CN113452393 A CN 113452393A CN 202110729655 A CN202110729655 A CN 202110729655A CN 113452393 A CN113452393 A CN 113452393A
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CN113452393B (en
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李杨飞
林铭团
郭岳儒
刘铭
徐�明
翟多才
李元鑫
刘继斌
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National University of Defense Technology
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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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • H04B1/1036—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/56—Monolithic crystal filters
    • H03H9/564—Monolithic crystal filters implemented with thin-film techniques
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/58—Multiple crystal filters
    • H03H9/582—Multiple crystal filters implemented with thin-film techniques

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Abstract

The application relates to a single-channel radio frequency anti-saturation device and method based on an FBAR filtering delay structure. The device comprises: the system comprises a power distribution module, an FBAR filter delay module, a self-adaptive filtering processing module, an amplitude-phase weighting module and a cancellation module, wherein the power distribution module converts a single-path radio frequency signal into multiple paths of radio frequency signals and inputs the multiple paths of radio frequency signals into the FBAR filter delay module to obtain delay radio frequency signals with different delays, the self-adaptive filtering processing module performs self-adaptive filtering on the delay radio frequency signals to obtain optimal weights, the amplitude-phase processing unit weights each path of radio frequency signals according to the optimal weights and then performs reverse phase cancellation processing to obtain the single-path radio frequency signals after saturation interference suppression. The FBAR filtering delay device replaces a heavy coaxial line delay structure and a complex optical fiber delay structure, and the size of the delay structure is greatly reduced on the premise of ensuring the single-channel radio frequency anti-saturation function.

Description

Single-channel radio frequency anti-saturation device and method based on FBAR filtering delay structure
Technical Field
The application relates to the technical field of radio frequency, in particular to a single-channel radio frequency anti-saturation interference device and method based on an FBAR filtering delay structure.
Background
Aiming at the problem of single-channel saturation interference suppression, the technical scheme of single-channel saturation interference resistance based on a coaxial delay device and an optical fiber delay device is provided at present. For the technical scheme based on the coaxial delay device, the length of the coaxial line meeting the delay requirement generally needs 1 to 3 meters, and the whole device is heavy. For the technical scheme based on the optical fiber delay device, the whole optical fiber delay device comprises an electro-optical conversion module, an optical branching module, an optical fiber delay module and a photoelectric conversion module, and the device complexity is high.
Disclosure of Invention
Based on the disadvantages of the existing delay devices, such as complexity and bulkiness, it is necessary to provide a single-channel radio frequency anti-saturation device and method based on FBAR filtering delay structure, in order to solve the above technical problems.
A single-channel radio frequency anti-saturation apparatus based on FBAR filtering delay structure, the apparatus comprising:
the power distribution module is used for equally dividing the radio frequency input signal of the single channel into a plurality of paths of synchronous radio frequency signals; and taking one path of the multi-path synchronous radio frequency signals as a reference signal, and taking the other paths as branch radio frequency signals.
And the FBAR filter delay module is used for respectively transmitting all the branch radio frequency signals and generating delay radio frequency signals with different time delays relative to the reference signal.
And the self-adaptive filtering processing module is used for processing all the time delay radio-frequency signals through a self-adaptive filtering algorithm to obtain the optimal weight of each branch radio-frequency signal, and inputting the optimal weight to the phase-preference weighting module.
And the amplitude-phase weighting module is used for weighting the branch radio-frequency signals according to the optimal weight value to obtain weighted radio-frequency signals.
And the cancellation module is used for combining all the weighted radio frequency signals and canceling the combined signals and the main path to obtain the single-path radio frequency signals after the saturation interference is suppressed.
Preferably, the power distribution module comprises a passive equal power distribution device.
Preferably, the FBAR filter delay module includes a plurality of FBAR filter delay branches, the FBAR filter delay branches are formed by cascading a plurality of FBAR filters, and the number of the FBAR filters in each FBAR filter delay branch is different.
The center frequency of the delay branch of the FBAR filter is the same as the frequency of the target receiving signal.
Preferably, the adaptive filtering processing module comprises a filtering algorithm unit; the principle of the filtering algorithm unit is as follows: and taking the first path of signal as a reference signal, taking a synthetic signal of other multi-path signals as a comparison signal, taking the difference value of the first path of signal and the synthetic signal as an error signal, obtaining the optimal weight of the radio frequency signal of each branch by adopting a self-adaptive filtering algorithm through iterative operation, outputting a corresponding control signal, and controlling the amplitude-phase weighting module.
Preferably, the adaptive filtering algorithm is a minimum mean square error adaptive filtering algorithm.
Preferably, the amplitude-phase weighting module comprises a voltage-controlled phase shifting unit and a voltage-controlled attenuation unit.
Preferably, the adaptive filtering processing module executes an adaptive filtering algorithm through an FPGA device.
A single-channel radio frequency anti-saturation method based on FBAR filtering delay structure, any one of the above devices can realize the suppression of single-channel saturation interference by adopting the method; the method comprises the following steps:
the input end of the power distribution module receives an input incident frequency signal, a single-path radio frequency signal is divided into multiple paths of radio frequency signals, one path of the multiple paths of synchronous radio frequency signals is used as a reference signal, and the other paths of synchronous radio frequency signals are used as branch radio frequency signals.
And inputting the branch radio frequency signals into the FBAR filter delay module, respectively transmitting all the branch radio frequency signals, and generating delay radio frequency signals with different time delays relative to the reference signal.
And inputting the time delay radio frequency signals into the self-adaptive filtering processing module, processing the time delay radio frequency signals by adopting a self-adaptive filtering algorithm to obtain optimal weights corresponding to the radio frequency signals of each branch, outputting corresponding control signals, and controlling the amplitude-phase weighting module.
And weighting each path of time delay radio frequency signal in the amplitude-phase weighting module according to the optimal weight value, and changing the amplitude-phase characteristics of each path of radio frequency signal to obtain a weighted radio frequency signal.
Combining all the weighted radio-frequency signals into a path of signal in the cancellation module, canceling the obtained combined signal and the reference signal in opposite phase, suppressing a high-power saturated interference signal, completing the work of single-channel saturated interference suppression, and outputting the processed single-channel radio-frequency signal.
In one embodiment, the adaptive filtering algorithm is a minimum mean square error adaptive filtering algorithm. Inputting the time delay radio frequency signal into the adaptive filtering processing module, processing the time delay radio frequency signal by adopting an adaptive filtering algorithm to obtain an optimal weight value corresponding to each branch radio frequency signal, outputting a corresponding control signal, and controlling the amplitude-phase weighting module, wherein the amplitude-phase weighting module comprises:
setting the initial value of the current time weight of each path of time delay radio frequency signal as 1.
And carrying out weighted summation on all the received time delay radio frequency signals according to the weight value at the current moment to obtain an output signal at the current moment.
And comparing the output signal at the current moment with the reference signal to obtain a current error.
And obtaining the next moment weight of each path of time delay signal according to the current error, the current moment weight, the current moment output signal, the time delay radio frequency signal and a preset global step length parameter.
And performing weight updating iteration processing by taking the weight at the next moment as the current weight until the current error meets a preset condition, and ending the iteration to obtain the optimal weight corresponding to each branch radio frequency signal.
And outputting a corresponding control signal according to the optimal weight value for controlling a magnitude-phase weighting module.
The single-channel radio frequency anti-saturation device and method based on the FBAR filtering delay structure comprise: the system comprises a power distribution module, an FBAR filter delay module, a self-adaptive filtering processing module, an amplitude-phase weighting module and a cancellation module, wherein the power distribution module converts a single-path radio frequency signal into multiple paths of radio frequency signals and inputs the multiple paths of radio frequency signals into the FBAR filter delay module to obtain delay radio frequency signals with different delays, the self-adaptive filtering processing module performs self-adaptive filtering on the delay radio frequency signals to obtain optimal weights, the amplitude-phase processing unit weights each path of radio frequency signals according to the optimal weights and then performs reverse phase cancellation processing to obtain the single-path radio frequency signals after saturation interference suppression. The FBAR filtering delay device replaces a heavy coaxial line delay structure and a complex optical fiber delay structure, and the size of the delay structure is greatly reduced on the premise of ensuring the single-channel radio frequency anti-saturation function.
Drawings
FIG. 1 is a block diagram of a single-channel RF anti-saturation apparatus based on FBAR filtering delay structure in an embodiment;
FIG. 2 is a schematic diagram of the algorithm of the adaptive filtering processing module in another embodiment;
FIG. 3 is a schematic structural diagram of a single-channel RF anti-saturation device based on an FBAR filtering delay structure in another embodiment;
fig. 4 is a schematic flow chart of a single-channel radio frequency anti-saturation method based on an FBAR filtering delay structure in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
A Film Bulk Acoustic Resonator (FBAR) is a high-performance band-pass filter which is rapidly developed in recent years, and the FBAR has a series of advantages of integration, high operating frequency, high power capacity, high Q value and the like, and has small volume and narrow bandwidth, and the high Q value indirectly causes the group delay to be larger, and the group delay can reach 20-40 ns. The group delay of the FBAR filter can meet the delay requirement of a single-channel saturated interference suppression device and can be used for saturated interference suppression.
In one embodiment, as shown in fig. 1, there is provided a single-channel rf anti-saturation apparatus based on FBAR filtering delay structure, the apparatus comprising:
the power distribution module 101 is configured to equally divide a single-channel radio frequency input signal into multiple synchronous radio frequency signals; one path of the multi-path synchronous radio frequency signals is used as a reference signal, and the other paths are used as branch radio frequency signals.
The FBAR filter delay module 102 is configured to transmit all branch radio frequency signals respectively, and generate delay radio frequency signals with different delays with respect to a reference signal.
And the adaptive filtering processing module 103 is configured to process all the time delay radio frequency signals through an adaptive filtering algorithm to obtain an optimal weight of each branch radio frequency signal, and input the optimal weight to the phase-preference weighting module.
And the amplitude-phase weighting module 104 is configured to weight the branch radio frequency signals according to the optimal weight value to obtain weighted radio frequency signals.
And the cancellation module 105 is configured to combine all the weighted radio frequency signals, and cancel the combined signal and the main path to obtain a single-path radio frequency signal with suppressed saturation interference.
In the single-channel radio frequency anti-saturation device based on the FBAR filtering delay structure, the device includes: the system comprises a power distribution module, an FBAR filter delay module, a self-adaptive filtering processing module, an amplitude-phase weighting module and a cancellation module, wherein the power distribution module converts a single-path radio frequency signal into multiple paths of radio frequency signals and inputs the multiple paths of radio frequency signals into the FBAR filter delay module to obtain delay radio frequency signals with different delays, the self-adaptive filtering processing module performs self-adaptive filtering on the delay radio frequency signals to obtain optimal weights, the amplitude-phase processing unit weights each path of radio frequency signals according to the optimal weights and then performs reverse phase cancellation processing to obtain the single-path radio frequency signals after saturation interference suppression. The FBAR filtering delay device replaces a heavy coaxial line delay structure and a complex optical fiber delay structure, and the size of the delay structure is greatly reduced on the premise of ensuring the single-channel radio frequency anti-saturation function.
In one embodiment, the power distribution module includes a passive equal power distribution device.
In one embodiment, the FBAR filter delay module includes multiple FBAR filter delay branches, the FBAR filter delay branches are formed by cascading multiple FBAR filters, and the number of the FBAR filters in each FBAR filter delay branch is different.
The center frequency of the delay branch of the FBAR filter is the same as the frequency of the target receiving signal.
In one embodiment, the adaptive filter processing module includes a filter algorithm unit.
The principle of a filtering algorithm unit is as follows: one of the multi-path signals is used as a reference signal, a composite signal of other multi-path signals is used as a comparison signal, the difference value of the two signals is used as an error signal, the optimal weight of each branch radio frequency signal is obtained by adopting a self-adaptive filtering algorithm through iterative operation, a corresponding control signal is output, and an amplitude-phase weighting module is controlled.
In one embodiment, the adaptive filtering algorithm is a minimum mean square error adaptive filtering algorithm.
In one embodiment, the amplitude-phase weighting module comprises a voltage-controlled phase shift unit and a voltage-controlled attenuation unit.
In one embodiment, the adaptive filtering processing module executes an adaptive filtering algorithm through the FPGA device.
In another embodiment, as shown in FIG. 2, a schematic diagram of an adaptive filtering algorithm is provided, where x1(m)、x2(m)、…、xn(m) represents each RF signal, i.e. there are n RF signals, w2(m)、w3(m)、…、wnAnd (m) are respectively the amplitude-phase weighted values of the other n-1 paths except the first path, and the first path of radio frequency signal is taken as a reference signal, so that the amplitude-phase weighting is not required. y (m) represents the RF output signal, d (m) represents the reference signal, i.e. the first RF signal x1(m)。
Preferably, the adaptive filtering algorithm adopts a minimum mean square error adaptive filtering algorithm, and the processing procedure of the algorithm is as follows:
filtered output signal: y (m) ═ w (m) × (m);
error of reference signal with output signal: e (m) ═ d (m) -y (m);
weight update coefficient: w (m +1) ═ W (m) -2 × e (m) × (m);
wherein W (m) ═ w2(m),w3(m),…,wn(m)]A weight vector composed of the weighted values of the amplitudes of n-1 routes except the first route at the current moment, W (m +1) a weight vector composed of the weighted values of the amplitudes of n-1 routes except the first route at the next moment, and X (m) ═ x2(m),x3(m),…,xn(m)]TAnd the device vector represents a signal vector formed by the second path radio frequency signal to the nth path radio frequency signal at the current moment, and mu represents a global step size parameter.
The loop process of the algorithm is as follows: and adding the radio frequency signals of the other n-1 paths except the first path under the condition of no amplitude-phase weighting to obtain an output signal y (1) after initial filtering, comparing the output signal y (1) with a reference signal d (1) to obtain an error signal e (1), updating the weight according to the size of e (1), bringing the updated weight into each path of radio frequency signal to obtain a new filtered output signal y (2), and continuously performing an iterative algorithm until the error e (1) meets a set error value, wherein the algorithm does not perform iteration any more, and the process of self-adaptive filtering is completed.
The final ideal effect of the adaptive filtering algorithm using minimum mean square error is that the filtered output signal y (m) is identical to the reference signal d (m). In single-channel anti-saturation interference, a signal which is basically the same as the amplitude phase of an interference signal is obtained by using a self-adaptive filtering algorithm, and the signal of the saturation interference can be suppressed by active cancellation.
As shown in fig. 3, a single-channel anti-saturation interference apparatus based on FBAR filtering delay structure is provided, which cannot realize too many branches in practical structure, in this example, three rf paths are taken as an example for illustration.
The single-channel radio frequency signal is equally divided into three paths of signals by the power divider 301, wherein one path is used as a main path, i.e. as a reference signal, the other two paths are used as branch radio frequency signals, the first branch is provided with a delay device 302 based on FBAR filtering and an amplitude-phase control device 304, the second branch is provided with a delay device 303 based on FBAR filtering and an amplitude-phase control device 305, the radio frequency signals of the first branch and the second branch are processed by an algorithm processing module 306 and compared with the reference signal of the main path to obtain errors, then the weight of each branch is updated, the updated weight is executed by the amplitude-phase control device, when the error of the radio frequency signals is smaller than a preset value, the adaptive filtering algorithm processing process is finished, saturation interference is suppressed by cancellation, and the single-path radio frequency signals are output.
Based on the FBAR filtering delay device 302 and the FBAR filtering delay device 303 based on the FBAR filter, the FBAR filter has small volume and narrow bandwidth, the size can be reduced to 0.7mm by 1.5mm by 0.23mm after wafer level packaging, the group delay can reach 20-40ns, the requirement required by a system is met, meanwhile, the insertion loss is controlled within 2dB, and compared with the heavy load of a coaxial line delay device and the complexity of an optical fiber delay device, the FBAR filtering delay device is an ideal time delay device.
The delay time of the FBAR filtering delay device is adjusted by the number of cascaded FBAR filters.
The input of the FBAR filtering delay device is the radio frequency signals of two branches, and delay radio frequency signals with different time delays are output.
The codes of the algorithm processing module can realize the relevant functions of the actual circuit through an FPGA (field programmable gate array), the input of the FPGA is the delay radio-frequency signal of each branch, and the output is the control signal of the amplitude-phase control device, in this example, a direct-current voltage signal.
The amplitude-phase control device comprises a voltage-controlled phase shifter and a voltage-controlled attenuator, and the output of the algorithm processing module can control the amplitude-phase control device to fulfill the aim of weighting the branch radio-frequency signals. The voltage-controlled phase shifter is used for controlling the phase of the radio-frequency signal, and the voltage-controlled attenuator is used for controlling the amplitude of the radio-frequency signal.
The modules form a closed loop system, and when the system is stably converged, the effect of saturated interference suppression can be achieved.
In an embodiment, as shown in fig. 4, a single-channel radio frequency anti-saturation method based on an FBAR filtering delay structure is provided, and the single-channel radio frequency anti-saturation apparatus based on the FBAR filtering delay structure may implement suppression of single-channel saturation interference by using the method; the method comprises the following steps:
step 401: the power distribution module divides the input single-path radio frequency signal into multiple paths of radio frequency signals, one path of the multiple paths of synchronous radio frequency signals is used as a reference signal, and the other paths of synchronous radio frequency signals are used as branch radio frequency signals.
Step 402: and inputting the branch radio-frequency signals into the delay module of the FBAR filter, respectively transmitting all the branch radio-frequency signals, and generating delay radio-frequency signals with different delays relative to the reference signal.
Step 403: the time delay radio frequency signals are input into the self-adaptive filtering processing module and processed by adopting a self-adaptive filtering algorithm to obtain the optimal weight corresponding to each branch radio frequency signal, corresponding control signals are output, and the amplitude-phase weighting module is controlled.
Step 404: and weighting each path of time delay radio frequency signal in an amplitude-phase weighting module according to the optimal weight value, and changing the amplitude-phase characteristic of each path of radio frequency signal to obtain a weighted radio frequency signal.
Step 405: combining all weighted radio-frequency signals into a path of signal in a cancellation module, performing opposite phase cancellation on the obtained combined signal and a reference signal, suppressing a high-power saturated interference signal, completing the work of single-channel saturated interference suppression, and outputting the processed single-channel radio-frequency signal.
In one embodiment, the adaptive filtering algorithm is a minimum mean square error adaptive filtering algorithm. Step 403 further includes: setting the initial value of the current time weight of each path of time delay radio frequency signal as 1; carrying out weighted summation on all received time delay radio frequency signals according to the weight value at the current moment to obtain an output signal at the current moment; comparing the output signal at the current moment with a reference signal to obtain a current error; obtaining the next time weight of each path of time delay signal according to the current error, the current time weight, the current time output signal, the time delay radio frequency signal and a preset global step length parameter; carrying out weight updating iteration processing by taking the weight at the next moment as the current weight until the current error meets a preset condition, and finishing the iteration to obtain the optimal weight corresponding to each branch radio frequency signal; and outputting a corresponding control signal according to the optimal weight value for controlling the amplitude-phase weighting module.
In one example, a single-channel radio frequency anti-saturation method based on an FBAR filtering delay structure mainly includes the following steps:
and step S1, dividing the single-path radio frequency signal into multiple paths of radio frequency signals, wherein one path is used as a reference signal path, and the other paths are used as amplitude-phase weighting branch paths.
And step S2, serially connecting the FBAR filters into each branch circuit to obtain a radio frequency signal with unnecessary time delay relative to the main circuit reference signal.
And step S3, inputting the branch radio frequency signals into the adaptive filtering algorithm module, and obtaining the optimal weight corresponding to each branch through iterative operation.
And step S4, weighting the branch signals through the amplitude-phase control device according to the optimal weight value to obtain weighted radio frequency signals.
And step S5, combining the radio frequency signals of each branch, and canceling the combined signal and the main path to obtain a single-path radio frequency signal after the saturation interference is suppressed.
In summary, the embodiment of the present application provides a single-channel anti-saturation interference apparatus and method based on an FBAR filtering delay structure, and the FBAR filtering delay apparatus replaces a heavy coaxial line delay structure and a complex optical fiber delay structure, so as to greatly reduce the size of the delay structure, and meanwhile, the apparatus and method are combined with an original adaptive filtering algorithm with a minimum mean square error, so as to provide the single-channel anti-saturation interference apparatus and method based on the FBAR filtering delay structure in the above embodiment.
It should be understood that, although the steps in the flowchart of fig. 4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 4 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A single-channel radio frequency anti-saturation device based on FBAR filtering delay structure, the device comprising:
the power distribution module is used for equally dividing the radio frequency input signal of the single channel into a plurality of paths of synchronous radio frequency signals; taking one path of the multiple paths of synchronous radio frequency signals as a reference signal, and taking the other paths of the multiple paths of synchronous radio frequency signals as branch radio frequency signals;
the FBAR filter delay module is used for respectively transmitting all the branch radio frequency signals and generating delay radio frequency signals with different time delays relative to the reference signal;
the adaptive filtering processing module is used for processing all the time delay radio frequency signals through an adaptive filtering algorithm to obtain the optimal weight of each branch radio frequency signal, and inputting the optimal weight to the phase-preference weighting module;
the amplitude-phase weighting module is used for weighting the branch radio-frequency signals according to the optimal weight value to obtain weighted radio-frequency signals;
and the cancellation module is used for combining all the weighted radio frequency signals and canceling the combined signals and the main path to obtain the single-path radio frequency signals after the saturation interference is suppressed.
2. The apparatus of claim 1, wherein the power distribution module comprises a passive equal power distribution device.
3. The apparatus of claim 1, wherein the FBAR filter delay module comprises a plurality of FBAR filter delay branches, the FBAR filter delay branches are formed by cascading a plurality of FBAR filters, and the number of FBAR filters in each FBAR filter delay branch is different;
the center frequency of the delay branch of the FBAR filter is the same as the frequency of the target receiving signal.
4. The apparatus of claim 1, wherein the adaptive filter processing module comprises a filter algorithm unit;
the principle of the filtering algorithm unit is as follows: and taking the first path of signal as a reference signal, taking a synthetic signal of other multi-path signals as a comparison signal, taking the difference value of the first path of signal and the synthetic signal as an error signal, obtaining the optimal weight of the radio frequency signal of each branch by adopting a self-adaptive filtering algorithm through iterative operation, outputting a corresponding control signal, and controlling the amplitude-phase weighting module.
5. The apparatus of claim 1, wherein the adaptive filtering algorithm is a minimum mean square error adaptive filtering algorithm.
6. The apparatus of claim 1, wherein the magnitude-phase weighting module comprises a voltage controlled phase shifting unit and a voltage controlled attenuation unit.
7. The apparatus according to any one of claims 1-6, wherein the adaptive filtering processing module executes an adaptive filtering algorithm through an FPGA device.
8. A single-channel radio frequency anti-saturation method based on an FBAR filtering delay structure is characterized in that the device of any one of claims 1 to 7 can realize the suppression of single-channel saturation interference by adopting the method; the method comprises the following steps:
receiving an input incident frequency signal by the input end of the power distribution module, dividing a single-path radio frequency signal into multiple paths of radio frequency signals, and taking one path of the multiple paths of synchronous radio frequency signals as a reference signal and taking the other paths of synchronous radio frequency signals as branch radio frequency signals;
inputting the branch radio frequency signals into the FBAR filter delay module, respectively transmitting all the branch radio frequency signals, and generating delay radio frequency signals with different time delays relative to the reference signal;
inputting the time delay radio frequency signals into the self-adaptive filtering processing module, processing by adopting a self-adaptive filtering algorithm to obtain optimal weights corresponding to the radio frequency signals of each branch, outputting corresponding control signals, and controlling the amplitude-phase weighting module;
weighting each path of time delay radio frequency signal in the amplitude-phase weighting module according to the optimal weight value, and changing the amplitude-phase characteristics of each path of radio frequency signal to obtain a weighted radio frequency signal;
combining all the weighted radio-frequency signals into a path of signal in the cancellation module, canceling the obtained combined signal and the reference signal in opposite phase, suppressing a high-power saturated interference signal, completing the work of single-channel saturated interference suppression, and outputting the processed single-channel radio-frequency signal.
9. The method of claim 8, wherein the adaptive filtering algorithm is a minimum mean square error adaptive filtering algorithm;
inputting the time delay radio frequency signal into the adaptive filtering processing module, processing the time delay radio frequency signal by adopting an adaptive filtering algorithm to obtain an optimal weight value corresponding to each branch radio frequency signal, outputting a corresponding control signal, and controlling the amplitude-phase weighting module, wherein the amplitude-phase weighting module comprises:
setting the initial value of the current time weight of each path of time delay radio frequency signal as 1;
carrying out weighted summation on all the received time delay radio frequency signals according to the weight value at the current moment to obtain an output signal at the current moment;
comparing the current time output signal with the reference signal to obtain a current error;
obtaining a next time weight of each path of time delay signal according to the current error, the current time weight, the current time output signal, the time delay radio frequency signal and a preset global step length parameter;
performing weight updating iteration processing by taking the weight at the next moment as the current weight until the current error meets a preset condition, and ending the iteration to obtain the optimal weight corresponding to each branch radio frequency signal;
and outputting a corresponding control signal according to the optimal weight value for controlling the amplitude-phase weighting module.
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