CN111510171B - Anti-interference device and anti-interference method for time slot switching working mode - Google Patents
Anti-interference device and anti-interference method for time slot switching working mode Download PDFInfo
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Abstract
The invention provides an anti-interference device and an anti-interference method for a time slot switching working mode, which comprise a low noise amplifier module, a band-pass filter module, a down-conversion module, an interference cancellation module, an up-conversion module, a band-pass filter module, an amplification module, a control module and a frequency synthesizer module. Experiments prove that the simple and efficient weight combining method can improve the anti-interference capability of a certain radio station by about 30dB, and has good application prospect in the anti-interference communication aspect of the radio station.
Description
Technical Field
The invention belongs to the technical field of communication anti-interference, and relates to a communication anti-interference device and an anti-interference method for a radio station with a time slot switching working mode.
Background
With the gradual maturity of the time slot switching technology, radio time slot switching in military or civil fields has incomparable functions, and research development and application of the time slot switching technology are receiving more and more attention. However, communication stations are often exposed to a relatively harsh environment and are susceptible to various intentional and unintentional interferences, especially strong interferences oriented to countermeasure conditions, and thus cannot work properly. The weight combining interference cancellation technology is an important technical means for solving the problem of radio frequency interference, and the interference signals of a receiving end are eliminated by adjusting and synthesizing gains of multi-antenna receiving signals. Current interference cancellation techniques are largely classified into analog interference cancellation techniques and digital interference cancellation techniques, depending on the implementation.
The analog interference cancellation technology is to use an analog signal processing mode to complete signal reconstruction in a radio frequency domain, and has the advantages of larger dynamic range, but has the limitations of high hardware implementation difficulty, high insertion loss, weak adaptive adjustment capability, low cancellation speed and the like. The digital domain interference cancellation technology is to realize the reconstruction of interference signals in a digital domain by utilizing a digital signal processing mode, and solves the problems of difficult multi-tap realization, high insertion loss, difficult weight self-adaptive adjustment, slow cancellation speed and the like. However, the existing digital domain interference cancellation technology needs to complete the received signal processing and then feed back to the receiving end, which is easy to cause the received signal delay. Due to the above problems, in order to ensure the real-time performance of receiving a useful signal at a receiving end and accurately eliminate an interference signal, the cancellation of the interference signal must be completed within the time slot switching time by fully combining the characteristics of the time slot switching operating mode radio station.
The patent application with the application number of CN201518001239.6 'multichannel interference cancellation device' and the patent application with the application number of CN201110223502.7 'adaptive interference cancellation device and debugging method thereof' all belong to the interference cancellation scheme of analog domain, and the patent application with the application number of CN201811155137.9 'digital-analog mixed adaptive interference cancellation device' belongs to the mixed interference cancellation scheme of analog domain and digital domain, but the scheme can not overcome the problems of realizing analog domain cancellation such as complexity, insertion loss, adaptive adjustment and cancellation speed in the field; the patent application with the application number of CN201811155774.6 'radio frequency cancellation device for digital domain interference reconstruction and method thereof' belongs to a digital domain interference cancellation scheme, but the scheme has the obvious defects of processing signal delay and poor real-time property.
In order to solve the technical problems, the invention designs a communication anti-interference device for a time slot switching working mode radio station, which realizes the interference signal cancellation strategy of interference signal reconstruction based on a digital domain in the radio station switching time slot.
Disclosure of Invention
The invention mainly provides a communication anti-jamming device and an anti-jamming method for a time slot switching working mode radio station, aiming at the problem of poor timeliness of the existing digital interference cancellation scheme and the existing analog interference cancellation scheme in interference suppression.
In order to achieve the above object, the present invention provides an anti-interference device for time slot switching operation mode, which includes a communication signal access module, an interference cancellation module, an up-conversion module, a second band-pass filter module, an amplification module, a control module and a frequency synthesizer module;
the input ends of the communication signal access module and the interference signal access module are respectively connected with each receiving antenna, the output ends of the communication signal access module and the interference signal access module are respectively connected with the interference cancellation module, communication signals and interference signals are cancelled and then accessed into the up-conversion module, the input end of the second band-pass filter module is connected with the up-conversion module, the output end of the second band-pass filter module is connected with the amplification module, and output signals of the amplification module are sent to a receiving terminal;
the interference cancellation module is further connected with the control module, and the output end of the frequency synthesizer module is respectively connected with the communication signal access module and the interference signal access module.
As a further limitation of the present invention, the communication signal access module comprises a low noise amplification module, a first band pass filter module and a down conversion module; the input end of the low-noise amplifier module is connected with a receiving antenna, and the output end of the low-noise amplifier module is connected with the input end of the first band-pass filter module; the output end of the band-pass filter module is connected with the input end of the down-conversion module; the input end of the down-conversion module is also connected with the output end of the frequency synthesizer module, and the output end of the down-conversion module is connected with the interference cancellation module; the interference signal access module has the same structure as the communication signal access module.
As a further limitation of the present invention, the down-conversion module includes a mixer unit, a filtering unit, an ADC unit, a down-conversion unit and a digital filtering unit; the input end of the frequency mixer unit is respectively connected with the first band-pass filter module and the frequency synthesizer module, the output end of the frequency mixer unit is connected with the filtering unit, the output end of the filtering unit is connected with the ADC unit, the output end of the ADC unit is connected with the down-conversion unit, the output end of the down-conversion unit is connected with the digital filtering unit, and the output end of the digital filtering unit is connected with the interference cancellation module.
As a further limitation of the present invention, the interference cancellation module includes a plurality of correlator units, a combiner unit and a weight optimization algorithm unit, wherein the input ends of the plurality of correlator units are respectively connected to the plurality of down-conversion modules and the weight optimization algorithm unit, and the output ends of the plurality of correlator units are connected to the combiner unit; the output end of the combiner unit is respectively connected with the weight optimizing algorithm unit and the up-conversion module, and the input end of the weight optimizing algorithm unit is also connected with the receiving terminal so as to access the frequency control word signal of the radio station.
As a further limitation of the present invention, the up-conversion module includes an up-conversion unit, a digital filtering unit, a DAC unit, and a mixer unit, wherein an input end of the up-conversion unit is connected to the interference cancellation module, an output end of the up-conversion unit is connected to the digital filtering unit, an output end of the digital filtering unit is connected to the DAC unit, an output end of the DAC unit is connected to the mixer unit, an input end of the mixer unit is further connected to the frequency synthesizer module, and an output end of the mixer unit is connected to the second band-pass filter module.
Meanwhile, the invention also provides an anti-interference method for switching the working mode of the time slot, which comprises the following steps:
step S1: initializing a model, setting an initial weight value and outputting a path of signal;
step S2: state synchronization, namely analyzing the working state of the radio station based on the radio station frequency control word information, and synchronizing the working state of the radio station with the state of the interference cancellation module;
step S3: optimizing the weight, wherein in the time slot switching time of the radio station, the interference cancellation module enters the weight optimizing process to obtain the weight capable of suppressing the interference to the maximum extent;
step S4: and (4) weight value keeping, wherein in the working time slot of the radio station, the interference cancellation module enters a weight value keeping process, namely, the optimal weight value is kept.
Further, the step S2 includes the following steps:
step S21: connecting the interference cancellation module with a frequency control word interface of a radio station;
step S22: interpreting its DATA and EN signals based on the station frequency word control protocol;
step S23: and controlling the working state of the interference cancellation module based on the DATA and EN signals to be synchronous with the working state of the radio station.
Further, the step S3 includes the following steps:
step S31: confirming that the radio station is in a time slot switching state;
step S32: utilizing the characteristic that no useful signal exists in the channel at the moment, and utilizing a space domain minimum mean square algorithm based on a power criterion to adjust the weight of the interference cancellation module;
step S33: the received signals after the down-conversion processing of the multiple paths are gained by weight adjustment, and then are combined and output, when the output signals reach a certain threshold, the weight at this time is the optimal weight.
Further, the step S4 includes the following steps:
step S41: confirming that the radio station is in a working time slot state based on the frequency control word;
step S42: terminating the updating of the weight by using a weight enabling signal and keeping the existing weight;
step S43: and adjusting the gain of the multipath received signals based on the optimal weight value, and combining and outputting.
Further, the spatial least mean square algorithm based on the power criterion includes the following steps:
step S51: fixing the weight of the first path of signal, and taking the weight as a reference signal;
step S52: feeding back the error between the weighted sum and the reference signal, and adjusting the weight values of other paths of signals based on a self-adaptive variable step size fast iterative algorithm;
step S53: calculating the error between the weighted sum of the reference signal and other signals, and when the error is minimum, the weight is the optimal weight;
the self-adaptive variable-step-size fast iterative algorithm comprises the following steps of:
step S61: selecting a larger step length in an initial convergence stage, and quickly updating the weight;
step S62: in the convergence process, the step length is reduced in a nonlinear way, and the weight is adjusted in a self-adaptive way
Step S62: a smaller step length is selected at the convergence completion stage and the step cadence is slowly adjusted as the error approaches zero.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention completes weight value optimization in the time slot switching time of the radio station, fully utilizes the window time of the radio station, and does not occupy the working time slot of the system while resisting interference; and the optimal weight value is kept in the working time slot of the radio station, the influence of known and unknown interference on the communication quality of the radio station is effectively controlled, and the anti-interference capability of the communication radio station is improved.
2. The down-conversion module in the invention adopts analog domain and digital domain mixed two-stage frequency conversion, which can effectively overcome intermediate frequency signal leakage; the interference cancellation module is realized in a digital domain, and has small insertion loss, larger dynamic range and higher cancellation speed.
3. The weight value optimization algorithm in the interference cancellation module adopts a weight value iterative algorithm based on time flow, and is simple and easy to implement and small in time delay; the weight value optimizing algorithm adopts nonlinear variable stepping, and the convergence speed of the optimal weight value can be obviously improved.
4. Experiments prove that the anti-interference method for switching the working mode of the time slot can improve the anti-interference capability of a certain radio station by about 30dB, and has good application prospect in the aspect of anti-interference communication of the radio station.
Drawings
FIG. 1 is a schematic diagram of the operation of the anti-jamming device for time slot switching of operation modes according to the present invention;
FIG. 2 is a schematic block diagram of a weight optimization and retention method in the anti-jamming method for time slot switching operation mode according to the present invention;
FIG. 3 is an internal schematic block diagram of the down conversion module of FIG. 1;
FIG. 4 is an internal functional block diagram of the interference cancellation module of FIG. 1;
FIG. 5 is an internal schematic block diagram of the upconversion module of FIG. 1;
fig. 6 is a diagram illustrating the communication anti-interference effect of a certain type of radio station using the anti-interference method for switching the operation mode of time slot according to the present invention.
Reference numerals:
1. a low noise amplifier module; 2. a first band pass filter module; 3. a down conversion module; 4. an interference cancellation module; 5. an up-conversion module, 6, a second band-pass filter module; 7. an amplifying module; 8. a control module; 9. a frequency synthesizer module;
31. a mixer unit; 32. a filtering unit; 33. an ADC unit; 34. a down-conversion unit; 35. a digital filtering unit;
41. a correlator unit; 42. a combiner unit; 43. a weight value optimizing algorithm unit;
51. an up-conversion unit; 52. a digital filtering unit; 53. a DAC unit; 54. a mixer unit.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Referring to fig. 1-6, the present invention provides an anti-interference apparatus for time slot switching operation mode, which includes a communication signal access module, an interference cancellation module 4, an up-conversion module 5, a second band-pass filter module 6, an amplification module 7, a control module 8, and a frequency synthesizer module 9;
the input ends of the communication signal access module and the interference signal access module are respectively connected with each receiving antenna, the output ends of the communication signal access module and the interference signal access module are respectively connected with the interference cancellation module 4, communication signals and interference signals are cancelled and then accessed into the up-conversion module 5, the input end of the second band-pass filter module 6 is connected with the up-conversion module 5, the output end of the second band-pass filter module is connected with the amplification module 7, and output signals of the amplification module 7 are sent to a receiving terminal;
the interference cancellation module 4 is further connected to the control module 8, and an output end of the frequency synthesizer module 9 is connected to the communication signal access module and the interference signal access module, respectively.
The communication signal access module comprises a low noise amplifier module 1, a first band-pass filter module 2 and a down-conversion module 3; the input end of the low-noise amplifier module 1 is connected with a receiving antenna, and the output end of the low-noise amplifier module is connected with the input end of the first band-pass filter module 2; the output end of the band-pass filter module 2 is connected with the input end of the down-conversion module 3; the input end of the down-conversion module 3 is further connected to the output end of the frequency synthesizer module 9, and the output end of the down-conversion module 3 is connected to the interference cancellation module 4; the interference signal access module has the same structure as the communication signal access module.
The digital parts of the up-conversion module 5, the interference cancellation module 4 and the down-conversion module 3 exist in the form of software in the digital signal processing device, and other modules exist in the form of hardware.
The input end of the low-noise amplifier module 1 is used for receiving signals of each antenna, the output end of the low-noise amplifier module 1 is connected with the first band-pass filter module 2 in a signal mode, and the low-noise amplifier module 1 is used for amplifying weak antenna receiving signals and facilitating post-processing.
The input end of the first band-pass filter module 2 is a low-noise amplified signal, the output end signal enters the down-conversion module 3, and the first band-pass filter module 2 is used for filtering out-of-band interference.
The input end of the down-conversion module 3 is a signal after band-pass filtering and an output signal of the frequency synthesizer module 9, the output end signal is a baseband signal, and the down-conversion module 3 is used for converting a radio frequency receiving signal into the baseband signal through secondary down-conversion so as to facilitate interference cancellation processing.
The input end of the interference cancellation module 4 is connected with the baseband signal after down-conversion processing, the output end signal enters the up-conversion module 5, and the interference cancellation module 4 is used for eliminating the interference signal mixed in the received signal.
The input end of the up-conversion module 5 is connected with the signal after weight combination and the output signal of the frequency synthesizer module 9, the output end of the up-conversion module 5 is connected with the band-pass filter module 6, and the up-conversion module 5 is used for converting a digital signal into an analog radio frequency signal.
The input end of the band-pass filter module 6 is connected with the signal after digital-to-analog conversion, the output end of the band-pass filter module 6 is connected with the amplifying module 7, and the band-pass filter module 6 is used for filtering out-of-band interference.
The input end of the amplifying module 7 is connected with the band-pass filter module 6, the output signal is sent to the receiving terminal radio station, and the amplifying module 7 is used for amplifying the signal after the anti-interference processing.
The input signal of the control module 8 is a frequency control word of a radio station, the output end of the control module is connected with the interference cancellation module 4, and the control module 8 is used for controlling the working state of the interference cancellation module 4.
The output end of the frequency synthesizer module 9 is connected to the down-conversion module 3 and the up-conversion module 5 in the communication signal access module and the interference signal access module, respectively, and the frequency synthesizer module 9 is used for providing a stable mixing signal.
The down-conversion module 3 is composed of a mixer unit 31, a filter unit 32, an ADC unit 33, a down-conversion unit 34 and a digital filter unit 35, wherein the input of the mixer unit 31 is a signal subjected to band-pass filtering and an output signal of the frequency synthesizer module 9, and the output end is connected to the filter unit 32 and is configured to convert an analog radio frequency signal into an analog intermediate frequency signal; the input signal of the filtering unit 32 is connected to the mixer unit 31, and the output signal is sent to the ADC unit 33 for filtering out-of-band interference after down conversion; the input end of the ADC unit 33 is connected to the band-pass filter 32, and outputs a digital signal to the down-conversion unit 34, and the ADC unit 33 is used for analog-to-digital conversion of the intermediate frequency signal; the input end of the down-conversion unit 34 is the intermediate frequency digital signal of the ADC unit 33, the output signal is sent to the digital filtering unit 35, and the down-conversion unit 34 is configured to convert the digital intermediate frequency signal into a baseband signal; the input end of the digital filtering unit 35 is a down-conversion unit 34, the signal at the output end is sent to the interference cancellation module 4, and the digital filtering unit 35 is used for further filtering out-of-band interference.
The interference cancellation module 4 is composed of a plurality of correlator units 41, a combiner unit 42 and a weight value optimization algorithm unit 43, wherein the input of the correlator unit 41 is the output signal of the down-conversion module 3 and the weight value output of the weight value optimization algorithm unit 43, and the output end is the combiner unit 42 for adjusting the received signal gain of the corresponding path; the input end of the combiner unit 42 is the signal output by the correlator unit 41 after adjusting the gain, and the output end is the anti-interference signal after combining the weights, which is used for combining and superposing the weights of the multipath signals; the input end of the weight value optimizing algorithm unit 43 is the weight value combined signal and the frequency control word signal of the radio station, and the output signal acts on each correlator unit 41 to optimize and update the gain of each antenna signal.
The up-conversion module 5 consists of an up-conversion unit 51, a digital filtering unit 52, a DAC unit 53 and a mixer unit 54, wherein the input end of the up-conversion unit 51 is connected with the output signal of the interference cancellation module 4, and the output end is connected with the digital filtering unit 52 and is used for converting the baseband signal to the intermediate frequency signal; the input end of the digital filtering unit 52 is connected with the upper frequency conversion unit 51, and the output end is connected with the DAC unit 53 and used for filtering out-of-band interference; the input terminal of DAC unit 53 is connected to digital filter unit 52, and the output signal is sent to mixer unit 54 for converting the digital intermediate frequency signal to the analog intermediate frequency signal; the input end of the mixer unit 54 is connected to the DAC unit 53 and the frequency synthesizer module 9, respectively, and the output signal is sent to the band-pass filter module 6 for converting the analog intermediate frequency signal into the analog radio frequency signal.
Meanwhile, the invention also provides an anti-interference method for switching the working mode of the time slot, which comprises the following steps:
step S1: initializing a model, setting an initial weight value and outputting a path of signal;
step S2: state synchronization, namely analyzing the working state of the radio station based on the radio station frequency control word information, and synchronizing the working state of the radio station with the state of the interference cancellation module 4;
step S3: optimizing the weight, wherein in the time slot switching time (switching time slot) of the radio station, the interference cancellation module 4 enters the weight optimizing process to obtain the weight capable of suppressing the interference to the maximum extent;
step S4: and (3) weight value keeping, wherein in the working time slot of the radio station, the interference cancellation module 4 enters a weight value keeping process, namely, the optimal weight value is kept.
Wherein, step S1 includes the following steps:
step S11: the initialization weight w is [1, 0., 0 ]]TThe output signals of the multipath received signals after weight combination are:
in the formula, N is the number of receiving antennas, w is the output weight of the weight optimizing unit 43, and x (N) is the output signal of the down-conversion module 2.
Step S12: the initialization control module 8 controls signals and is set to be in a working time slot state, at this time, the interference cancellation module 4 is in a weight value holding state, and outputs a path of signal.
Further, the synchronization of the station operating state and the state of the interference cancellation module 4 in step S2 includes the following steps:
step S21: connecting the interference cancellation module 4 with a radio station frequency control word interface;
step S22: interpreting its DATA and EN signals based on the station frequency word control protocol;
step S13: and controlling the working state of the interference cancellation module 4 based on the DATA and EN signals to synchronize with the working state of the radio station.
Further, the method for optimizing the weight of the interference cancellation module 4 in step S3 includes the following steps:
step S31: confirming that the radio station is in a time slot switching state;
step S32: and (3) utilizing the characteristic that no useful signal exists in the channel at the moment, and carrying out a space domain LMS algorithm based on a power criterion:
in the formula (I), the compound is shown in the specification,
output signal, s, combined for the weight of combiner unit 420＝[1,0,..,0]T。
Introducing a Lagrange multiplier lambda, and constructing an objective function:
setting the offset to zero, and solving the optimal weight as follows:
in the formula, Rx＝E{xxT}; since the optimal weight solution needs to calculate the data autocorrelation and matrix inversion exists, the calculation efficiency is seriously reduced and the real-time performance is influenced, the equivalent weight iteration is adoptedThe algorithm is as follows:
wa(n+1)←wa(n)-μxa(n)d(n)
wherein mu is a nonlinear variable step,
alpha and beta adjustable step shape and range, w ═ 1, wa]T，
x (n) is the output signal of the down-conversion module 3, and d (n) is the output signal combined by the weight of the combiner unit 42.
Step S33: the gain of the multi-channel preprocessed received signals is adjusted by weight, and then the signals are merged and output, when the output signal is minimum (reaches a certain threshold), the weight at the moment is the optimal weight.
Further, the method for maintaining the weight of the interference cancellation module 4 in step S4 includes the following steps:
step S41: confirming that the radio station is in a working time slot state based on the frequency control word;
step S42: terminating the weight updating by using a weight enabling signal and keeping the existing weight w;
step S43: and adjusting the gain of the multipath received signals based on the optimal weight, and combining and outputting:
the spatial least mean square algorithm based on the power criterion adopted in the step S32 comprises the following steps:
step S51: fixing the weight of the first path of signal, and taking the weight as a reference signal;
step S52: feeding back the error between the weighted sum and the reference signal, and adjusting the weight values of other paths of signals based on a self-adaptive variable step size fast iterative algorithm;
step S53: and calculating the error between the weighted sum of the reference signal and other signals, and when the error is minimum, the weight is the optimal weight.
The self-adaptive variable-step-size fast iterative algorithm in the method comprises the following steps:
step S61: selecting a larger step length in an initial convergence stage, and quickly updating the weight;
step S62: in the convergence process, the step length is reduced in a nonlinear way, and the weight is adjusted in a self-adaptive way
Step S62: a smaller step length is selected at the convergence completion stage and the step cadence is slowly adjusted as the error approaches zero.
Fig. 6 shows the interference threshold of a certain radio station and the variation curve of the interference threshold after the anti-interference scheme proposed by the present invention is adopted. The result of fig. 6 is obtained by a practical test system, and it can be seen that when the received power is equivalent to the interference power, the system is interrupted; after the cancellation scheme provided by the invention is adopted, the interference threshold of the system is improved by nearly 30 dB.
In summary, the invention combines the time domain adaptive weight optimization and the maintained anti-interference algorithm, calculates the weight value quickly by the space domain least mean square algorithm of the power criterion in the time slot switching time of the radio station in an iterative manner, maintains the optimal weight value after the time slot switching is completed, can perform accurate null trap on the interference on the directional diagram of the receiving antenna of the communication radio station under the condition of not knowing the interference and the signal direction, suppresses various interferences, and maintains the integrity of useful communication signals, so as to solve the anti-interference problem of the communication radio station in the actual communication use. Experiments prove that the simple and efficient weight combining method can improve the anti-interference capability of a certain radio station by about 30dB, and has good application prospect in the anti-interference communication aspect of the radio station.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (5)
1. An anti-interference method based on an anti-interference device for switching working modes in time slots is characterized in that: the anti-interference device for switching the working mode of the time slot comprises a communication signal access module, an interference cancellation module (4), an up-conversion module (5), a second band-pass filter module (6), an amplification module (7), a control module (8) and a frequency synthesizer module (9);
the input ends of the communication signal access module and the interference signal access module are respectively connected with each receiving antenna, the output ends of the communication signal access module and the interference signal access module are respectively connected with the interference cancellation module (4), communication signals and interference signals are cancelled and then accessed into the up-conversion module (5), the input end of the second band-pass filter module (6) is connected with the up-conversion module (5), the output end of the second band-pass filter module is connected with the amplification module (7), and output signals of the amplification module (7) are sent to a receiving terminal;
the interference cancellation module (4) is further connected with the control module (8), and the output end of the frequency synthesizer module (9) is respectively connected with the communication signal access module and the interference signal access module;
the communication signal access module comprises a low noise amplifier module (1), a first band-pass filter module (2) and a down-conversion module (3); the input end of the low-noise amplifier module (1) is connected with a receiving antenna, and the output end of the low-noise amplifier module is connected with the input end of the first band-pass filter module (2); the output end of the band-pass filter module (2) is connected with the input end of the down-conversion module (3); the input end of the down-conversion module (3) is also connected with the output end of the frequency synthesizer module (9), and the output end of the down-conversion module (3) is connected with the interference cancellation module (4); the structure of the interference signal access module is the same as that of the communication signal access module;
the down-conversion module (3) comprises a mixer unit (31), a filtering unit (32), an ADC unit (33), a down-conversion unit (34) and a digital filtering unit (35); the input end of the mixer unit (31) is respectively connected to the first band-pass filter module (2) and the frequency synthesizer module (9), the output end thereof is connected to the filtering unit (32), the output end of the filtering unit (32) is connected to the ADC unit (33), the output end of the ADC unit (33) is connected to the down-conversion unit (34), the output end of the down-conversion unit (34) is connected to the digital filtering unit (35), and the output end of the digital filtering unit (35) is connected to the interference cancellation module (4);
the interference cancellation module (4) comprises a plurality of correlator units (41), a combiner unit (42) and a weight value optimization algorithm unit (43), wherein the input ends of the correlator units (41) are respectively connected with the down-conversion modules (3) and the weight value optimization algorithm unit (43), and the output ends of the correlator units (41) are connected to the combiner unit (42); the output end of the combiner unit (42) is respectively connected with the weight value optimizing algorithm unit (43) and the up-conversion module (5), and the input end of the weight value optimizing algorithm unit (43) is also connected to the receiving terminal so as to access a frequency control word signal of a radio station;
the up-conversion module (5) comprises an up-conversion unit (51), a digital filtering unit (52), a DAC unit (53) and a mixer unit (54), wherein the input end of the up-conversion unit (51) is connected with the interference cancellation module (4), the output end of the up-conversion unit is connected with the digital filtering unit (52), the output end of the digital filtering unit (52) is connected with the DAC unit, the output end of the DAC unit (53) is connected with the mixer unit (54), the input end of the mixer unit (54) is further connected with the frequency synthesizer module (9), and the output end of the mixer unit is connected with the second band-pass filter module (6);
the anti-interference method comprises the following steps:
step S1: initializing a model, setting an initial weight value and outputting a path of signal;
step S2: state synchronization, namely analyzing the working state of the radio station based on the radio station frequency control word information, and synchronizing the working state of the radio station with the state of the interference cancellation module (4);
step S3: optimizing the weight, wherein in the switching time slot of the radio station, the interference cancellation module (4) enters the weight optimizing process to obtain the weight capable of suppressing the interference to the maximum extent;
step S4: and (3) weight value keeping, wherein in the working time slot of the radio station, the interference cancellation module (4) enters a weight value keeping process, namely the optimal weight value is kept.
2. The jamming protection method based on a jamming device for time slot switching operation mode according to claim 1, characterized in that: the step S2 includes the following steps:
step S21: connecting the interference cancellation module (4) with a frequency control word interface of a radio station;
step S22: interpreting its DATA and EN signals based on the station frequency word control protocol;
step S23: and controlling the working state of the interference cancellation module (4) based on the DATA and EN signals to be synchronous with the working state of the radio station.
3. The jamming protection method based on a jamming device for time slot switching operation mode according to claim 1, characterized in that: the step S3 includes the following steps:
step S31: confirming that the radio station is in a time slot switching state;
step S32: the weight of the interference cancellation module (4) is adjusted by utilizing the characteristic that no useful signal exists in the channel at the moment and utilizing a space domain minimum mean square algorithm based on a power criterion;
step S33: the received signals after the down-conversion processing of the multiple paths are gained by weight adjustment, and then are combined and output, when the output signals reach a certain threshold, the weight at this time is the optimal weight.
4. The jamming protection method based on a jamming device for time slot switching operation mode according to claim 1, characterized in that: the step S4 includes the following steps:
step S41: confirming that the radio station is in a working time slot state based on the frequency control word;
step S42: terminating the updating of the weight by using a weight enabling signal and keeping the existing weight;
step S43: and adjusting the gain of the multipath received signals based on the optimal weight value, and combining and outputting.
5. The tamper resistant method based on a tamper resistant device for time slot switching of operating modes according to claim 3, characterized in that: the space domain least mean square algorithm based on the power criterion comprises the following steps:
step S51: fixing the weight of the first path of signal, and taking the weight as a reference signal;
step S52: feeding back the error between the weighted sum and the reference signal, and adjusting the weight values of other paths of signals based on a self-adaptive variable step size fast iterative algorithm;
step S53: calculating the error between the weighted sum of the reference signal and other signals, and when the error is minimum, the weight is the optimal weight;
the self-adaptive variable-step-size fast iterative algorithm comprises the following steps of:
step S61: selecting a larger step length in an initial convergence stage, and quickly updating the weight;
step S62: in the convergence process, the step length is reduced in a nonlinear way, and the weight is adjusted in a self-adaptive way
Step S62: a smaller step length is selected at the convergence completion stage and the step cadence is slowly adjusted as the error approaches zero.
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