CN109412639B - Microwave communication same frequency interference protector - Google Patents
Microwave communication same frequency interference protector Download PDFInfo
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Abstract
The invention provides a microwave communication same frequency interference protection device, which comprises a reference sampling module, a radio frequency cancellation module, an intermediate frequency cancellation module and a digital cancellation module, wherein the reference sampling module is used for sampling a reference signal; the reference sampling module is used for down-converting the broadband co-frequency interference to a specified intermediate frequency, extracting an interference signal sample positioned in a microwave communication channel, and respectively inputting the interference signal sample into the radio frequency cancellation module, the intermediate frequency cancellation module and the baseband cancellation module as reference signals; a reference signal and a receiver local oscillation signal are respectively input into two input ends of the reference sampling module, and first to third output ends of the four output ends are respectively connected with a second input end of the radio frequency cancellation module, a second input end of the intermediate frequency cancellation module and a second input end of the baseband cancellation module and are used as cancellation reference signals; the fourth output end is connected with the third input end of the radio frequency interference cancellation module and used as a local oscillation signal for converting the intermediate frequency reference to the radio frequency reference. The invention can improve the cancellation ratio of broadband interference.
Description
Technical Field
The invention belongs to the field of system electromagnetic compatibility, and particularly relates to a microwave communication same frequency interference protection device.
Background
Microwave communication has the advantages of large capacity, good quality, long transmission distance and the like, is an important means of a national communication network, and is also generally suitable for various special communication networks. Taking ship microwave communication as an example, the current ship communication mode is mainly short wave and ultrashort wave, and is changed into the mode that a plurality of satellite communication channels and microwave communication channels can be opened simultaneously, so that the communication capacity of high-speed broadband strategy and tactical data, image, dynamic video and voice multi-network transmission is realized. In a ship platform with limited space, radars, communication and electronic warfare equipment with various microwave frequency bands are densely arranged. The antennas of the radar, communication and electronic warfare equipment are various in types, large in quantity and dense in spatial arrangement, the frequency resources of the equipment are short, frequency spectrum conflict is easily caused, the problem of serious same frequency interference is caused, partial radio frequency equipment cannot work simultaneously, and the set fighting efficiency of the radio frequency equipment is difficult to achieve. Specifically, when a high-power radar or an electronic warfare device works, a high-power transmitting signal (including stray, noise, harmonic waves and the like) is received by a receiving antenna through spatial coupling and is transmitted to a receiver, so that the high-sensitivity microwave communication receiver working in an adjacent frequency band is affected, the microwave communication error rate is increased, and the receiver cannot normally receive the signal.
The interference cancellation technology is an effective technical approach for solving the problem of antenna radiation interference of the co-located transceiver. The currently available adaptive interference cancellation apparatus is mainly based on the orthogonal vector synthesis structure shown in fig. 1. The principle is that a cancellation signal with the same amplitude and opposite phase with an interference signal is generated by adjusting the amplitude and the phase of a reference signal, and then the cancellation signal and the interference signal are subjected to vector synthesis and interference cancellation. The cancellation signal can be expressed as if the reference signal is such that the adjustment of amplitude and phase is considered as a complex weighting of the reference signal. Assuming the ideal weight is located at the center frequency, the interference cancellation ratio at the off-center frequency will decrease to where it represents the delay matching error at the frequency, and c is the interference cancellation ratio at the frequency. Taking 10MHz as an example, if the cancellation ratio is not lower than 40dB, the delay matching error should not exceed 0.16 ns. In a co-location environment, an interference signal generated by a high-power transmitter to a high-sensitivity receiver can reach more than tens of megahertz, and the delay characteristic of an interference coupling channel has obvious nonlinear characteristics, so that the matching error generated by adopting a conventional linear delay matching method is often far more than a few nanoseconds. Therefore, it is difficult to implement effective wideband interference cancellation in a single weight cancellation system using a conventional orthogonal vector synthesis structure.
The adaptive broadband interference cancellation device (patent number: CN 203057161) of chinese patent, the ultrashort electromagnetic interference cancellation device (application number 201010198092.0), the multi-channel interference cancellation device (application number 201518001239.6), the co-site coupling interference cancellation device (application number 201518001240.9), the adaptive broadband interference cancellation device (application number 201320001505.0), and the adaptive interference cancellation module or device in the adaptive interference cancellation device and the debugging method thereof (application number 201110223502.7) are all based on the single weight orthogonal vector synthesis circuit shown in fig. 1, and thus are not suitable for broadband interference cancellation.
Disclosure of Invention
The invention aims to provide a microwave communication same frequency interference protection device aiming at the defects of the technology, which can improve the cancellation ratio of broadband interference.
The invention provides a microwave communication same frequency interference protection device, which comprises a reference sampling module, a radio frequency cancellation module, an intermediate frequency cancellation module and a digital cancellation module.
The reference sampling module is used for down-converting the broadband co-frequency interference to a specified intermediate frequency, extracting an interference signal sample positioned in a microwave communication channel, and respectively inputting the interference signal sample into the radio frequency cancellation module, the intermediate frequency cancellation module and the baseband cancellation module as reference signals; a reference signal and a receiver local oscillation signal are respectively input into two input ends of the reference sampling module, and first to third output ends of the four output ends are respectively connected with a second input end of the radio frequency cancellation module, a second input end of the intermediate frequency cancellation module and a second input end of the baseband cancellation module and are used as cancellation reference signals; the fourth output end is connected with the third input end of the radio frequency interference cancellation module and used as a local oscillation signal for converting the intermediate frequency reference to the radio frequency reference.
The radio frequency cancellation module is used for generating a radio frequency interference cancellation signal, synthesizing the radio frequency interference cancellation signal with a radio frequency interference signal in a receiving channel at an output port of a receiving antenna, and canceling the radio frequency interference signal; the first input end of the radio frequency cancellation module is connected with the output end of the receiving antenna and used for receiving radio frequency interference signals; the second input end of the reference sampling module is connected with the first output port of the reference sampling module and used for receiving the cancellation reference signal; the third input end of the reference sampling module is connected with the fourth input end of the reference sampling module, and a local oscillator signal for up-conversion is input; the output end of the down-conversion circuit is connected with the down-conversion input end of the receiver.
The intermediate frequency cancellation module is used for generating an intermediate frequency interference cancellation signal, and canceling the residual interference of the input radio frequency cancellation at the output end of the down-conversion module of the receiver again so as to further reduce the broadband same frequency interference entering the baseband part of the receiver. The first input end of the intermediate frequency cancellation module is connected with the output end of the down-conversion module of the receiver and is used for receiving the residual interference signals after the radio frequency cancellation; the second input end of the reference sampling module is connected with the second output port of the reference sampling module and used for receiving the cancellation reference signal; the output end of the filter is connected with the input end of the baseband cancellation module.
The baseband cancellation module is used for further suppressing residual interference signals processed by the radio frequency interference cancellation module and the intermediate frequency cancellation module in a digital domain. A first input end of the baseband cancellation module is connected with an output end of the intermediate frequency cancellation module and used for receiving residual interference signals after intermediate frequency cancellation; the second input end of the reference sampling module is connected with the third output end of the reference sampling module and used for receiving the cancellation reference signal; the output end of the input end is connected with the input end of the baseband processing module of the receiver.
Further, the reference sampling module comprises a preselection band-pass filter, a down-conversion module, a down-conversion band-pass filter, an intermediate frequency power divider a, a tunable local oscillator source, a local oscillator power divider a, an intermediate frequency amplifier B and an intermediate frequency amplifier C. The input of the preselection band-pass filter is a reference signal used for extracting the reference signal positioned in the working frequency band of the receiver; the first input end of the down-conversion module is connected with the output end of the preselection filter, the second input end of the down-conversion module is connected with the first output end of the local oscillator power divider A, and the output end of the down-conversion module is connected with the input end of the down-band-pass filter and used for down-converting an interference sampling signal to a fixed intermediate frequency; the output end of the down-conversion band-pass frequency filter is connected with the input end of the intermediate frequency power divider A and is used for inhibiting image components generated in the down-conversion frequency mixing process; the three output ends of the intermediate frequency power divider A are respectively connected with the input ends of the three intermediate frequency amplifiers, and the output ends of the three intermediate frequency amplifiers are respectively connected with the second input end of the radio frequency cancellation module, the second input end of the intermediate frequency cancellation module and the second input end of the baseband cancellation module and are used as cancellation reference signals; the tunable local oscillator source has a clock input end sharing a clock source with the receiver, a control end receiving carrier frequency information for the microwave communication receiver, and an output end connected with an input end of the local oscillator power divider A and used for generating a local oscillator signal and performing down-conversion on the receiving carrier to a designated intermediate frequency; and a first output end of the local oscillator power divider A is connected with a second input end of the down-conversion module, and a second output end of the local oscillator power divider A is connected with a third input end of the radio frequency weight module.
Further, the radio frequency cancellation module includes a radio frequency sub-band division module, a radio frequency weight module, a radio frequency synthesizer a, a radio frequency synthesizer B, a radio frequency coupler a, and a radio frequency power divider a. The reference input end (namely the second input end of the radio frequency cancellation module) of the radio frequency sub-band dividing module is connected with the first output end of the reference sampling module, the local oscillator input end (namely the third input end of the radio frequency cancellation module) of the radio frequency sub-band dividing module is connected with the fourth output end of the reference sampling module, and the output end of the radio frequency sub-band dividing module is connected with the reference input end of the radio frequency weight module and is used for up-converting an intermediate frequency reference signal to a specified microwave receiving frequency and using the intermediate frequency reference signal as the radio frequency reference signal of the radio frequency weight module; the feedback input end of the radio frequency weight module is connected with one output end of the radio frequency power divider A, and the output end of each radio frequency weight module is respectively connected with one input end of the radio frequency synthesizer A and is used for adaptively generating a radio frequency cancellation signal; one input end of the radio frequency synthesizer A is connected with the output end of a radio frequency weight module, the output end of the radio frequency synthesizer A is connected with the second input end of the radio frequency synthesizer B, the first input end of the radio frequency synthesizer B is the first input end of the radio frequency cancellation module, and the output end of the radio frequency synthesizer B is connected with the input end of the radio frequency coupler A and used for combining radio frequency cancellation and radio frequency interference signals; the direct output end of the radio frequency coupler A is the output end of the radio frequency cancellation module, the coupling input end of the radio frequency coupler A is connected with the input end of the radio frequency power divider A, and the output ends of the radio frequency power divider A are respectively connected with the feedback input end of a radio frequency weight module.
Further, the radio frequency sub-band division module includes a radio frequency power divider B, a local oscillator power divider B, a band pass filter, an up-conversion module, an up-conversion filter, and a radio frequency amplifier. The radio frequency power divider B is a 1-minute multi-power divider, the input end of the radio frequency power divider B is a reference sampling module reference signal input end, each output end of the radio frequency power divider B is respectively connected with the input end of a band-pass filter, the output end of the band-pass filter is connected with a first input end of an up-conversion module, the output end of the up-conversion module is connected with the input end of the up-conversion filter, and the output end of the up-conversion filter is connected with the; the local oscillator power divider B is a 1-division multi-power divider, the input end of the local oscillator power divider is the reference input end of the reference sampling module, and the output ends of the local oscillator power divider B are respectively connected with the local oscillator input end of an up-conversion module.
Further, the radio frequency weight module includes a radio frequency power divider C, a multi-path delay, a radio frequency coupler B, a multi-path vector modulator, a radio frequency adaptive control circuit, and a radio frequency synthesizer C. The input end of the radio frequency power divider C is a reference input end of the weight module, a radio frequency reference signal is input, one output end of the radio frequency power divider C is connected with the input end of a delayer, the output end of the delayer is connected with the input end of a radio frequency coupler B, a through output end of the radio frequency coupler B is connected with the radio frequency input end of a vector modulator, a coupling output end of the radio frequency coupler B is connected with one reference input end of a radio frequency adaptive control circuit, the radio frequency output end of the radio frequency vector modulator is connected with one input end of a radio frequency synthesizer C, and the output end of the radio frequency synthesizer C is the output end of the radio frequency cancellation module; the output of the radio frequency self-adaptive control circuit is a multi-path weight, and one path of weight (composed of one path of in-phase weight and one path of orthogonal weight) of the radio frequency self-adaptive control circuit is connected with two weight control ports of one path of radio frequency vector modulator.
Further, the radio frequency adaptive control circuit comprises a radio frequency power divider D and a multipath weight calculation module. The radio frequency power divider D is a 1-minute multi-power divider, and the input end of the radio frequency power divider D is the feedback input end of the self-adaptive control circuit; the first input end of the weight calculation module is connected with an output end of the radio frequency power divider D, the second input end of the weight calculation module is a reference input end of the adaptive control circuit, and the output end of the weight calculation module is a weight (including an in-phase weight and a quadrature weight) output end of the adaptive control circuit.
Further, the intermediate frequency cancellation module includes an intermediate frequency sub-band division module, an intermediate frequency weight module, an intermediate frequency synthesizer a, an intermediate frequency synthesizer B, an intermediate frequency coupler a, and an intermediate frequency power divider B. The reference input end of the intermediate frequency sub-band dividing module (namely the second input end of the intermediate frequency cancellation module) is connected with the second output end of the reference sampling module, and one output end of the intermediate frequency sub-band dividing module is connected with the reference input end of the intermediate frequency weight module and is used for dividing the intermediate frequency reference signal into a plurality of sub-bands according to the frequency band and taking the sub-bands as the reference signal of the intermediate frequency weight module; the feedback input end of the intermediate frequency weight module is connected with one output end of the intermediate frequency power divider B, and the output end of each intermediate frequency weight module is respectively connected with one input end of the intermediate frequency synthesizer A and is used for adaptively generating an intermediate frequency cancellation signal; one input end of the intermediate frequency synthesizer A is connected with the output end of one path of intermediate frequency weight module, the output end is connected with the second input end of the intermediate frequency synthesizer B, the first input end of the intermediate frequency synthesizer B is the first input end of the intermediate frequency cancellation module, and the output end of the intermediate frequency synthesizer B is connected with the input end of the intermediate frequency coupler A and is used for combining the intermediate frequency cancellation and the radio frequency cancellation residual interference; the direct output end of the intermediate frequency coupler A is the output end of the intermediate frequency cancellation module, the coupling input end of the intermediate frequency coupler A is connected with the input end of the intermediate frequency power divider B, and the output ends of the intermediate frequency power divider B are respectively connected with the feedback input end of one intermediate frequency weight module. The structure of the intermediate frequency cancellation module is similar to that of the radio frequency cancellation module, and the main difference is that the radio frequency sub-band division module is different from and the same as the intermediate frequency sub-band division module, and the radio frequency sub-band division module also needs to up-convert the reference signal to the radio frequency after sub-band division. Therefore, except the detailed structure of the intermediate frequency sub-band division module, the rest parts of the intermediate frequency cancellation module are not described herein again.
Further, the intermediate frequency sub-band division module comprises an intermediate frequency power divider C and a plurality of intermediate frequency band-pass filters; and one output end of the intermediate-frequency power divider C is connected with the input end of an intermediate-frequency band-pass filter, and the output end of the intermediate-frequency band-pass filter is connected with the reference input end of the intermediate-frequency weight module.
The baseband self-adaptive cancellation module comprises: the digital adaptive filter comprises two orthogonal power dividers, four mixers, four low-pass filters, four analog-to-digital conversion circuits, a fixed frequency source, a power divider and a digital adaptive filtering module. The input end of the quadrature power divider A is connected with the third output end of the reference sampling module, and the in-phase output end and the quadrature output end are respectively connected with the first input end of the mixer A, B and are used for dividing the reference signal into two orthogonal signals in an equal power way; the input end of the orthogonal power divider B is connected with the output end of the intermediate frequency cancellation module, and the in-phase output end and the orthogonal output end are respectively connected with the first input end of the mixer C, D and are used for dividing the interference signal into two orthogonal signals in an equal power way; the outputs of the mixers A, B, C, D are respectively connected to the input ends of the low pass filters A, B, C, D, and are used for down-converting the in-phase if reference signals output by the quadrature power divider to baseband; the output end of the low-pass filter A, B, C, D is connected to the input end of the analog-to-digital conversion circuit A, B, C, D, respectively, and is used for filtering the image component output by the mixer A, B, C, D; the output end of the analog-to-digital conversion circuit A, B, C, D is connected with the first to fourth input ends of the digital adaptive filter module and is used for digitizing the output signal of the low-pass filter A, B, C, D; the output of the fixed frequency source is connected with the input end of the power divider and is used for generating a local oscillator signal with fixed frequency; the output end of the power divider is respectively connected with the second input end of the frequency mixer A, B, C, D and is used for dividing the local oscillator signal into four paths of equal power; the output of the digital adaptive filtering module is connected with a base band module of the receiver and is used for carrying out interference cancellation in a digital domain.
The invention uses the idea of multi-weight interference cancellation to carry out same frequency broadband interference suppression, and combines a band-pass filtering method to divide the broadband interference into sub-bands, thereby reducing the processing difficulty of the broadband interference; in the cancellation scheme, a three-level cancellation method is adopted to improve the interference cancellation ratio, namely, the interference cancellation is carried out on the same-frequency interference of the broadband in a microwave frequency band, a receiver fixed intermediate frequency and a base band, so that the method is suitable for the broadband cancellation interference.
Drawings
FIG. 1 is a block diagram of a conventional adaptive interference cancellation apparatus
FIG. 2 is a block diagram of an embodiment of the present invention
FIG. 3 is a block diagram of a reference sampling module according to an embodiment of the present invention
FIG. 4 is a block diagram of an embodiment of the RF cancellation module of the present invention
FIG. 5 is a block diagram of an embodiment of the RF sub-band partitioning module of the present invention
FIG. 6 is a block diagram of an embodiment of a RF weight module according to the present invention
FIG. 7 is a block diagram of an embodiment of an adaptive RF control module according to the present invention
FIG. 8 is a block diagram of an embodiment of a frequency cancellation module according to the present invention
FIG. 9 is a block diagram of an embodiment of an subband partitioning module according to the present invention
Fig. 10 is a block diagram of a baseband cancellation module according to an embodiment of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
Fig. 2 is a block diagram of an embodiment of the present invention. The connection relationship and the function of each module are described as follows: the reference sampling module 1 is used for extracting interference signal samples to each cancellation module, the input end of the reference sampling module is connected with a reference signal, the first output port is connected with the input end of the radio frequency cancellation module 2, the second output port is connected with the second input end of the intermediate frequency cancellation module 3, and the third output port is connected with the second input end of the baseband cancellation module 4; the radio frequency cancellation module 2 is used for canceling radio frequency interference signals at an output port of the receiving antenna, a first input end of the radio frequency cancellation module is connected with an output end of the receiving antenna, and an output end of the radio frequency cancellation module is connected with an input end of a down-conversion module of the receiver; the intermediate frequency cancellation module 3 is used for canceling the intermediate frequency interference signal at a down-conversion output port of the receiver, a first input end of the intermediate frequency cancellation module is connected with an output end of the down-conversion module of the receiver, and an output end of the intermediate frequency cancellation module is connected with a first input end of the baseband cancellation module 4; the baseband cancellation module 4 is used for canceling the interference signal at the baseband, a first input end of the baseband cancellation module 4 is connected with an output end of the intermediate frequency cancellation module 3, and an output end of the baseband cancellation module is connected with an input end of the receiver baseband processing module.
The basic working principle of the invention is as follows: the broadband reference signal is processed by the reference sampling module to obtain interference samples positioned in a communication channel, and is divided into three paths of reference signals which are respectively provided for the radio frequency cancellation module 2, the intermediate frequency cancellation module 3 and the baseband cancellation module 4; the radio frequency cancellation module 2 performs preliminary cancellation on the interference signal in a radio frequency band; the intermediate frequency cancellation module 3 cancels the interference signal at the intermediate frequency, and further suppresses the interference signal on the basis of the cancellation result of the radio frequency cancellation module 2; the baseband interference cancellation module 4 performs interference cancellation in a baseband digital domain, and further improves cancellation ratio on the basis of cancellation results of the radio frequency cancellation module 2 and the radio frequency cancellation module 3; the three-stage cancellation improves the cancellation ratio of broadband interference in a series mode.
In this example, the microwave communication receiver adopts a superheterodyne mode, the operating bandwidth is 300MHz, the real-time bandwidth is 40MHz, 31 channels are total, the intermediate frequency of the receiver is 350MHz, and the bandwidth of the interference signal is greater than 300 MHz. According to the information of the receiving channel, the reference sampling module extracts the interference in the receiving channel and obtains three paths of reference signals after processing. The center frequency of the first path of reference signal is the same as the working frequency of the receiver, and the bandwidth is the same as the real-time bandwidth of the receiver; the center frequency of the second path of reference signal is the same as the intermediate frequency of the receiver, and the bandwidth is the same as the intermediate frequency bandwidth of the receiver; the frequency and bandwidth of the third output signal are the same as those of the second output signal.
Fig. 3 is a block diagram of a reference sampling module 1 according to an embodiment of the present invention. The reference sampling module 1 comprises: the system comprises a preselection band-pass filter 11, a down-conversion module 12, a down-conversion filter 13, an intermediate frequency power divider A14, an intermediate frequency amplifier A15, an intermediate frequency amplifier B16, an intermediate frequency amplifier C17, a tunable local oscillator source 18 and a local oscillator power divider A19. The input end of the preselection band-pass filter 11 is connected with a reference signal, and the output end of the preselection band-pass filter is connected with the first input end of the down-conversion module 12 and used for filtering interference signals outside the working frequency range of the receiver; the output end of the down-conversion module 12 is connected with the input end of the down-conversion filter 13 and is used for down-converting the interference sampling signal to an intermediate frequency; the output end of the down-conversion filter 13 is connected with the input end of the intermediate frequency power divider A14 and is used for down-conversion image rejection and interference signal rejection outside the real-time bandwidth of the receiver; the three output ends of the intermediate frequency power divider A14 are respectively connected with the input ends of an intermediate frequency amplifier A15, an intermediate frequency amplifier B16 and an intermediate frequency amplifier C17; the output ends of the three intermediate frequency amplifiers are respectively connected with the second input ends of the radio frequency cancellation module, the intermediate frequency cancellation module and the baseband cancellation module.
In this example, the preselection band-pass filter is the same as the preselection band-pass filter of the operating band of the microwave receiver, and the down-conversion module can adopt a first-stage, a second-stage or a multi-stage mixer according to the actual situation to down-convert the 40MHz bandwidth co-frequency interference signal in the receiving channel to the designated intermediate frequency, such as 350MHz, without aliasing.
Fig. 4 is a block diagram of an embodiment of the rf cancellation module 2 according to the present invention. The radio frequency cancellation module 2 includes: a radio frequency sub-band dividing module 21, M radio frequency weight modules 22, an M-path radio frequency synthesizer A23, a radio frequency synthesizer B24, a radio frequency coupler A25 and a 1-division M radio frequency power divider A26; the radio frequency sub-band dividing module 21 has a reference input end connected to a first output end of the reference sampling module 1, a local oscillator input end connected to a fourth output end of the reference sampling module 1, and integer output ends of M ≥ 2 connected to reference input ends of the M radio frequency weight modules 22 respectively, and is configured to up-convert an intermediate frequency reference signal to a specified microwave receiving frequency; a feedback input end of the rf weight module 22 is connected to an output end of the rf power divider a26, and output ends thereof are respectively connected to an input end of the rf synthesizer a23, so as to adaptively generate an rf cancellation signal; one input end of the radio frequency synthesizer A23 is connected with the output end of a radio frequency weight module 22, and the output end of the radio frequency synthesizer A23 is connected with the second input end of the radio frequency synthesizer B24; a radio frequency synthesizer B24, a first input end of which is the first input end of the radio frequency cancellation module 2, and an output end of which is connected with the input end of the radio frequency coupler A25, for synthesizing the radio frequency cancellation and the radio frequency interference signal; the through output end of the rf coupler a25 is the output end of the rf cancellation module, the coupling input end of the rf coupler a is connected to the input end of the rf power divider a, and each output end of the rf coupler a is connected to the feedback input end of one of the rf weight modules 22.
In this example, the radio frequency sub-band division module first divides the 40MHz bandwidth interference into a plurality of sub-bands at intermediate frequency using a plurality of fixed band pass filters; and then, the M paths of intermediate frequency reference signals with the total bandwidth of 40MHz are converted to a radio frequency receiving channel once or step by step in a way symmetrical to down conversion and are used as radio frequency reference signals of a radio frequency weight module, so that radio frequency cancellation signals are generated.
Fig. 5 is a block diagram of an embodiment of the rf sub-band dividing module 21 according to the present invention. The radio frequency sub-band dividing module 21 includes a 1-division-M radio frequency power divider B211, a 1-division-M local oscillation power divider B212, M band-pass filters 213, M up-conversion modules 214, M up-conversion filters 215, and M radio frequency amplifiers 216. Wherein, the input end of the rf power divider B211 is the reference signal input end of the reference sampling module, each output end is connected to the input end of a band-pass filter 213, the output end of the band-pass filter 213 is connected to the first input end of an up-conversion module 214, the output end of the up-conversion module 214 is connected to the input end of an up-conversion filter 215, and the output end of the up-conversion filter 215 is connected to the input end of a rf amplifier 216; the input end of the local oscillator power divider B212 is the reference input end of the reference sampling module 1, and each output end is connected to a local oscillator input end of the up-conversion module 214.
Fig. 6 is a block diagram of an embodiment of the rf weight module 22 according to the present invention. The rf weight module 22 includes: the radio frequency power divider C221, an integer number of delayers 222 with P being more than or equal to 2, P radio frequency couplers B223, a P-path radio frequency vector modulator 224, a radio frequency self-adaptive control circuit 225 and a radio frequency synthesizer C226. Wherein, the input end of the rf power divider C is an rf reference signal, one output end thereof is connected to the input end of the delay 222, the output end of the delay 222 is connected to the input end of the rf coupler 223, the through output end of the rf coupler 223 is connected to the rf input end of the rf vector modulator 224, the coupled output end of the rf coupler 223 is connected to a reference input end of the rf adaptive control circuit 225, and the rf output end of the rf vector modulator 224 is connected to an input end of the rf synthesizer C226; the reference input ends of the P paths of the radio frequency adaptive control circuit 225 are respectively connected with the coupling output ends of the M paths of radio frequency couplers B223, the feedback input end of the radio frequency adaptive control circuit 225 is the feedback input end of the radio frequency weight module 22, and the output of the radio frequency adaptive control circuit 225 is a P path weight, wherein one path of weight is composed of one path of in-phase weight and one path of orthogonal weight, and is respectively connected with the in-phase path and the orthogonal path weight control port of one path of radio frequency vector modulator.
In this example, the rf weight module is based on an analog FIR filter structure, and the delay value of each delay is designed according to the delay between taps of the FIR filter.
Fig. 7 is a block diagram of an embodiment of the rf adaptive control module 225 according to the present invention. The radio frequency adaptive control module 225 includes: a 1-branch P-path radio frequency power divider D2251 and a P-path weight calculation module 2252. Wherein, an input end of the rf power divider D2251 is a feedback input end of the adaptive control module 225; the weight calculation module 2252 has a first input connected to an output of the rf power divider D2251, a second input being a reference input of the adaptive control module 225, and an output being a weight output of the adaptive control module 225.
In this example, the control circuit in patent application No. 201518001239.6 can be used by each path weight calculation module to calculate two paths of orthogonal weights.
Fig. 8 is a block diagram of an embodiment of the cancellation module 3. The intermediate frequency cancellation module 3 includes: the system comprises an intermediate frequency sub-band dividing module 31, an integer circuit intermediate frequency weight module 32 with N being more than or equal to 2, an N-in-1 intermediate frequency synthesizer A33, a 2-in-1 intermediate frequency synthesizer B34, an intermediate frequency coupler A35 and a 1-in-N intermediate frequency power divider B6. The reference input end of the intermediate frequency sub-band dividing module 31 is connected to the second output end of the reference sampling module 1, and one output end of the intermediate frequency sub-band dividing module is connected to the reference input end of the intermediate frequency weight module 32, and is used for dividing the intermediate frequency reference signal into a plurality of sub-bands according to frequency bands; the feedback input end of the intermediate frequency weight module 32 is connected with one output end of the intermediate frequency power divider B36, the output ends of the N intermediate frequency weight modules 32 are respectively connected with the P input ends of the intermediate frequency synthesizer a33, and the output end of the intermediate frequency synthesizer a33 is an intermediate frequency cancellation signal; a first input end of the intermediate frequency synthesizer B34, namely a first input end of the intermediate frequency cancellation module, a second input end of the intermediate frequency synthesizer B34 is connected with an output end of the intermediate frequency synthesizer A33, and an output end of the intermediate frequency synthesizer B34 is connected with an input end of the intermediate frequency coupler A35 and is used for synthesizing residual interference of intermediate frequency cancellation and radio frequency cancellation; the through output end of the intermediate frequency coupler a35 is the output end of the intermediate frequency cancellation module 3, the coupling input end of the intermediate frequency coupler a35 is connected with the input end of the intermediate frequency power divider B36, and each output end of the intermediate frequency power divider B36 is connected with the feedback input end of one intermediate frequency weight module 32. Except for the intermediate frequency sub-band division module 31, the rest of the intermediate frequency cancellation module 3 is similar to the radio frequency cancellation module, but the frequency bands are different, and the description is omitted here.
Fig. 9 is a block diagram of an embodiment of the subband splitting module 31 in the present invention. The intermediate frequency sub-band division module 31 includes: 1, an integer intermediate frequency power divider C311 with K being more than or equal to 2 and K intermediate frequency band-pass filters 312; an output end of the if power divider C311 is connected to an input end of an if band-pass filter 312, and an output end of the if band-pass filter 312 is connected to a reference input end of the if weight module 32.
Fig. 10 is a block diagram of the baseband cancellation module 4 according to an embodiment of the present invention. The baseband cancellation module 4 includes: the input end of the orthogonal power divider A401 is connected with the third output end of the reference sampling module 1, the in-phase output end of the orthogonal power divider A401 is connected with one input end of the mixer A402, and the orthogonal output end of the orthogonal power divider A is connected with one input end of the mixer B403 and used for dividing the reference signal into two orthogonal signals with 90-degree phase difference; the output ends of the mixer A402 and the mixer B403 are respectively connected with the input ends of the low-pass filter A404 and the low-pass filter B405, and are respectively used for down-converting two orthogonal paths of intermediate frequency reference signals output by the orthogonal power divider to a baseband; the output ends of the low-pass filter A404 and the low-pass filter B405 are respectively connected with the input ends of the analog-to-digital conversion circuit A406 and the analog-to-digital conversion circuit B407 and are respectively used for image rejection output by the mixer A402 and the mixer B403; the output ends of the analog-to-digital conversion circuit a406 and the analog-to-digital conversion circuit B407 are connected with the first and second input ends of the digital adaptive filter module 417, and are respectively used for digitizing the output signals of the low-pass filter a404 and the low-pass filter B405; the input end of the orthogonal power divider B408 is connected with the output end of the reference intermediate frequency cancellation module 3, the in-phase output end of the orthogonal power divider B is connected with one input end of the mixer C409, and the orthogonal output end of the orthogonal power divider B is connected with one input end of the mixer D410 and used for dividing the interference signal into two orthogonal signals with the phase difference of 90 degrees; the outputs of the mixer C409 and the mixer D410 are connected to the input ends of the low-pass filter C411 and the low-pass filter D412, and are used for down-converting the intermediate frequency reference signal output by the quadrature power divider to a baseband; the output end of the low-pass filter C411 is connected with the input end of the analog-to-digital conversion circuit C413 and the input end of the analog-to-digital conversion circuit D414, and the low-pass filter C are respectively used for image rejection output by the mixer A402 and the mixer B403; the output ends of the analog-to-digital conversion circuit C411 and the analog-to-digital conversion circuit D412 are connected with the third and fourth input ends of the digital adaptive filter module 417, and are used for digitizing the output signals of the low-pass filter C411 and the low-pass filter D411; a fixed frequency source 415, the output of which is connected to the input end of the power divider 416 and is used for generating a local oscillator signal with a fixed frequency; a power divider 416, whose four outputs are respectively connected to the other input ends of the mixer a402, the mixer B403, the mixer C409 and the mixer D416, and configured to divide the local oscillator signal into four equal power; a digital adaptive filtering module 408, the output of which is connected to the receiver baseband module for performing interference cancellation in the digital domain;
in this example, the analog-to-digital conversion circuit a406, the analog-to-digital conversion circuit B407, the analog-to-digital conversion circuit C411, and the analog-to-digital conversion circuit D412 employ high-speed ADCs; the digital self-adaptive filtering module is based on a digital FIR filter structure, adopts an LMS algorithm to calculate the weight and is realized in an FPGA.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (10)
1. A microwave communication same-frequency interference protection device is characterized by comprising:
the reference sampling module (1) is used for down-converting the broadband co-frequency interference to a specified intermediate frequency, extracting an interference signal sample positioned in a microwave communication channel, and respectively inputting the interference signal sample into the radio frequency cancellation module, the intermediate frequency cancellation module and the baseband cancellation module as reference signals; the input end of the radio frequency cancellation module is connected with a reference signal and a local oscillation signal of a receiver, the first output end of the radio frequency cancellation module is connected with the second input end of the radio frequency cancellation module (2), the second output end of the radio frequency cancellation module is connected with the second input end of the intermediate frequency cancellation module (3), and the third output end of the radio frequency cancellation module is connected with the second input end of the baseband cancellation module (4) and used for extracting an interference signal sample to the cancellation module to; the fourth output end is connected with the third input end of the radio frequency cancellation module, converts the intermediate frequency reference into a local oscillation signal of the radio frequency reference and transmits the local oscillation signal to the radio frequency cancellation module;
the radio frequency cancellation module (2) is used for generating a radio frequency interference cancellation signal; the first input end of the antenna is connected with the output end of the receiving antenna and receives broadband radio frequency interference signals; the output end is connected with the input end of the down-conversion module of the receiver and is used for canceling interference signals at radio frequency;
the intermediate frequency cancellation module (3) is used for generating an intermediate frequency interference cancellation signal and canceling the residual interference of the input radio frequency cancellation again at the output end of the down-conversion module of the receiver; the first input end of the down-conversion module is connected with the output end of the down-conversion module of the receiver and used for receiving the residual interference signals after radio frequency cancellation; the second input end is connected with the second output end of the reference sampling module and used for receiving the cancellation use reference signal; the output end of the baseband cancellation module is connected with the input end of the baseband cancellation module;
the baseband cancellation module (4) is used for further suppressing residual interference signals processed by the radio frequency interference module and the intermediate frequency cancellation module in a digital domain; the first input end of the intermediate frequency cancellation module is connected with the output end of the intermediate frequency cancellation module and used for receiving residual interference signals after intermediate frequency cancellation; the second input end of the reference sampling module is connected with the third output end of the reference sampling module and used for receiving the cancellation reference signal; the output end of the signal processing module is connected with the input end of the baseband processing module of the receiver and is used for canceling the interference signal at the baseband.
2. The apparatus for preventing co-channel interference in microwave communication according to claim 1, wherein the reference sampling module (1) comprises:
the input end of the preselection band-pass filter (11) is connected with a reference signal, the output end of the preselection band-pass filter is connected with the first input end of the down-conversion module (12) and is used for filtering interference signals outside the working frequency band of the receiver and extracting the reference signal positioned in the working frequency band of the receiver;
a second input end of the down-conversion module (12) is connected with a first output end of the local oscillator power divider A, and an output end of the down-conversion module is connected with an input end of a down-conversion filter (13) and is used for down-converting the interference sampling signal to an intermediate frequency;
the output end of the down-conversion filter (13) is connected with the input end of the intermediate frequency power divider A (14) and is used for down-conversion image rejection and interference signal rejection outside the real-time bandwidth of the receiver;
the three output ends of the intermediate frequency power divider A (14) are respectively connected with the input ends of an intermediate frequency amplifier A (15), an intermediate frequency amplifier B (16) and an intermediate frequency amplifier C (17); the output ends of the three intermediate frequency amplifiers are respectively connected with the second input end of the radio frequency cancellation module, the second input end of the intermediate frequency cancellation module and the second input end of the baseband cancellation module and are used as cancellation reference signals;
the tunable local oscillator source (18) has a clock input end for receiving a receiver clock signal, a control end for receiving the receiving carrier frequency information, and an output end electrically connected with the local oscillator power divider A for generating a local oscillator signal and down-converting the receiving carrier frequency to a designated intermediate frequency;
the output end of the local oscillator power divider A is electrically connected with the second input end of the down-conversion module (12) and the third input end of the radio frequency cancellation module (2).
3. The apparatus for preventing co-channel interference in microwave communication according to claim 2, wherein said rf cancellation module (2) comprises:
the radio frequency sub-band dividing module (21) is connected with a reference input end of the intermediate frequency reference signal output by the reference sampling module (1), a local oscillator input end of the radio frequency sub-band dividing module is connected with a local oscillator signal input end, and M paths of output ends of the radio frequency sub-band dividing module are respectively connected with reference input ends of M paths of radio frequency weight modules (22) and are used for up-converting the intermediate frequency reference signal to a specified microwave receiving frequency; m is an integer greater than or equal to 2;
a radio frequency weight module (22), a feedback input end of which is connected with an output end of the radio frequency power divider A (26), and output ends of which are respectively connected with an input end of the radio frequency synthesizer A (23), for adaptively generating a radio frequency cancellation signal;
one input end of the radio frequency synthesizer A (23) is connected with the output end of a radio frequency weight module (22), and the output end of the radio frequency synthesizer A is connected with the second input end of the radio frequency synthesizer B (24) and used for generating a radio frequency cancellation signal;
a radio frequency synthesizer B (24), a first input end of which is a first input end of the radio frequency cancellation module (2), and an output end of which is connected with an input end of the radio frequency coupler A (25), for synthesizing the radio frequency cancellation and the radio frequency interference signal;
and the direct-through output end of the radio frequency coupler A (25) is the output end of the radio frequency cancellation module, the coupling input end of the radio frequency coupler A is connected with the input end of the radio frequency power divider A, and the output ends of the radio frequency power divider A (26) are respectively connected with the feedback input end of a radio frequency weight module (22) and used for extracting a cancellation error signal as a feedback input signal of the radio frequency self-adaptive control circuit.
4. The apparatus for preventing co-channel interference in microwave communication according to claim 3, wherein said radio frequency sub-band dividing module (21) comprises:
the input end of the radio frequency power divider B (211) is a reference signal input end of a reference sampling module, and each output end of the radio frequency power divider B is respectively connected with a plurality of groups of band-pass filters (213), up-conversion modules (214), up-conversion filters (215) and radio frequency amplifiers (216) which are sequentially and electrically connected; the output end of the radio frequency amplifier (216) is electrically connected with the reference input end of the radio frequency weight module;
and the input end of the local oscillator power divider B (212), namely the local oscillator input end of the reference sampling module (1), is connected with the local oscillator input ends of the up-conversion modules (214) respectively.
5. The apparatus according to claim 4, wherein the RF weight module (22) comprises:
the input end of the radio frequency power divider C (226) is a radio frequency reference signal, the output end of the radio frequency power divider C is connected with the input end of the M-path delayer (222), the output end of each delayer (222) is connected with the input end of the radio frequency coupler B (223), the through output end of each radio frequency coupler B (223) is connected with the radio frequency input end of a radio frequency vector modulator (224), the coupling output end of each radio frequency coupler B (223) is connected with a reference input end of the radio frequency adaptive control circuit (225), and the radio frequency output end of each radio frequency vector modulator (224) is connected with one input end of the radio frequency synthesizer C (226); the radio frequency synthesizer C (226) outputs a radio frequency cancellation signal;
and the P reference input ends of the radio frequency self-adaptive control circuit (225) are respectively connected with the coupling output ends of the M radio frequency couplers B (223), the feedback input end of the radio frequency self-adaptive control circuit (225) is the feedback input end of the radio frequency weight module (22), and the output of the radio frequency self-adaptive control circuit (225) is a P weight, wherein one weight consists of one in-phase weight and one quadrature weight and is respectively connected with the in-phase weight control port and the quadrature weight control port of one radio frequency vector modulator.
6. The apparatus according to claim 5, wherein the radio frequency adaptive control circuit (225) comprises:
the input end of the radio frequency power divider D (2251) is the feedback input end of the radio frequency adaptive control circuit (225); and a weight calculation module (2252), a first input of which is connected to an output of the rf power divider D (2251), a second input of which is a reference input of the rf adaptive control circuit (225), and an output of which is a weight output of the rf adaptive control circuit (225).
7. The apparatus for preventing co-channel interference in microwave communication according to claim 6, wherein said if cancellation module (3) comprises:
the reference input end of the intermediate frequency sub-band dividing module (31) is connected with the second output end of the reference sampling module (1), and a plurality of output ends of the intermediate frequency sub-band dividing module are respectively connected with the reference input end of an intermediate frequency weight module (32) and are used for dividing the intermediate frequency reference signal into a plurality of sub-bands according to frequency bands;
the feedback input end of the intermediate frequency weight module (32) is connected with one output end of the intermediate frequency power divider B (36), the output ends of the N paths of intermediate frequency weight modules (32) are respectively connected with the P paths of input ends of the intermediate frequency synthesizer A (33), and the output end of the intermediate frequency synthesizer A (33) outputs an intermediate frequency cancellation signal;
a first input end of the intermediate frequency synthesizer B (34), namely a first input end of the intermediate frequency cancellation module, a second input end of the intermediate frequency synthesizer B is connected with an output end of the intermediate frequency synthesizer A (33), and an output end of the intermediate frequency synthesizer B is connected with an input end of the intermediate frequency coupler A (35) and is used for synthesizing the residual interference of the intermediate frequency cancellation and the radio frequency cancellation;
the through output end of the intermediate frequency coupler A (35) is the output end of the intermediate frequency cancellation module (3), the coupling input end of the intermediate frequency coupler A (35) is connected with the input end of the intermediate frequency power divider B (36), and each output end of the intermediate frequency power divider B (36) is respectively connected with the feedback input end of one intermediate frequency weight module (32).
8. The apparatus for preventing co-channel interference in microwave communication according to claim 7, wherein said if sub-band dividing module (31) comprises:
the input end of the intermediate frequency power divider C (311) is connected with the second output end of the reference sampling module (1), and a plurality of output ends of the intermediate frequency power divider C are respectively connected with the input end of an intermediate frequency band-pass filter (312);
and the output end of the intermediate frequency band-pass filter (312) is connected with the reference input end of the intermediate frequency weight module (32).
9. The microwave communication co-frequency interference protection device according to claim 7, wherein the intermediate frequency weight module (32) and the radio frequency weight module (22) have the same module structure.
10. The apparatus according to claim 1, wherein the baseband cancellation module comprises:
the input end of the orthogonal power divider A (401) is connected with the third output end of the reference sampling module (1), the in-phase output end of the orthogonal power divider A is connected with one input end of the mixer A (402), and the orthogonal output end of the orthogonal power divider A is connected with one input end of the mixer B (403) and is used for dividing the reference signal into two orthogonal signals with 90-degree phase difference;
a mixer A (402), the output of which is connected with the input end of a low-pass filter A (404), and is used for down-converting the in-phase intermediate frequency reference signal output by the quadrature power divider to the baseband;
a mixer B (403), the output of which is connected with the input end of the low-pass filter B (405), and is used for down-converting the quadrature intermediate frequency reference signal output by the quadrature power divider to the baseband;
a low-pass filter A (404) with the output end connected with the input end of the analog-to-digital conversion circuit A (406) and used for image rejection of the output of the mixer A (402);
a low-pass filter B (405), the output end of which is connected with the input end of the analog-to-digital conversion circuit B (407) and is used for image rejection of the output of the mixer B (403);
an analog-to-digital conversion circuit A (406), the output of which is connected with one input end of the digital adaptive filter module (417) and is used for digitizing the output signal of the low-pass filter A (404);
the output of the analog-to-digital conversion circuit B (407) is connected with the other input end of the digital adaptive filter module (417) and is used for digitizing the output signal of the low-pass filter B (405);
the input end of the orthogonal power divider B (408) is connected with the output end of the intermediate frequency cancellation module (3), the in-phase output end of the orthogonal power divider B is connected with one input end of the mixer C (409), and the orthogonal output end of the orthogonal power divider B is connected with one input end of the mixer D (410) and is used for dividing the interference signal into two paths of orthogonal signals with the phase difference of 90 degrees;
a mixer C (409), the output of which is connected with the input end of the low-pass filter C (411), and the mixer C (409) is used for down-converting the in-phase intermediate frequency reference signal output by the quadrature power divider to a baseband;
a mixer D (410), the output of which is connected with the input end of the low-pass filter D (412), and is used for down-converting the quadrature intermediate frequency reference signal output by the quadrature power divider to the baseband;
the output end of the low-pass filter C (411) is connected with the input end of the analog-to-digital conversion circuit C (413) and is used for image rejection of the output of the mixer C (409);
a low-pass filter D (412), the output end of which is connected with the input end of the analog-to-digital conversion circuit D (414) and is used for image rejection of the output of the mixer D (410);
the output end of the analog-to-digital conversion circuit C (413) is connected with one input end of the digital adaptive filter module (417) and is used for digitizing the output signal of the low-pass filter C (411);
an analog-to-digital conversion circuit D (414), the output end of which is connected with the other input end of the digital adaptive filter module (417) and is used for digitizing the output signal of the low-pass filter D (412);
the output of the fixed frequency source (415) is connected with the input end of the power divider (416) and is used for generating a local oscillator signal with a fixed frequency;
a power divider (416), the four outputs of which are respectively connected with the other input ends of the mixer A (402), the mixer B (403), the mixer C (409) and the mixer D (410), and the power divider is used for dividing the local oscillator signal into four paths;
a digital adaptive filtering module (417) whose output is connected to the receiver baseband module for interference cancellation in the digital domain.
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| CN111600620B (en) * | 2020-03-27 | 2021-11-02 | 中国人民解放军海军工程大学 | Cancellation method of analog cancellation device for eliminating interference |
| CN111697983B (en) * | 2020-03-27 | 2022-03-29 | 中国人民解放军海军工程大学 | Linear frequency modulation continuous wave radar receiving and transmitting interference cancellation device |
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