CN115001527A - Frequency conversion time delay compensation method based on homologous reference in microwave cancellation system - Google Patents
Frequency conversion time delay compensation method based on homologous reference in microwave cancellation system Download PDFInfo
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- CN115001527A CN115001527A CN202210548550.1A CN202210548550A CN115001527A CN 115001527 A CN115001527 A CN 115001527A CN 202210548550 A CN202210548550 A CN 202210548550A CN 115001527 A CN115001527 A CN 115001527A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 11
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- 238000004260 weight control Methods 0.000 claims abstract description 11
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/023—Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques
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Abstract
The invention discloses a frequency conversion delay compensation method based on a homologous reference in a microwave cancellation system, which comprises the steps of sampling by a signal sampling module, and respectively sending signals to a vector modulation module and a homologous reference frequency reduction delay matching module by a power distribution module; the output signal of the vector modulation module is transmitted to the signal synthesis module, the output signal of the signal synthesis module is sent to a receiving end through the signal feedback module, the homologous reference frequency-reduction time-delay matching module collects the signals of the signal sampling module, the power distribution module and the signal feedback module and carries out frequency reduction processing on the signals, group delay errors of reference signals and interference signals are calculated, the group delay errors are compensated through a multi-order picosecond-level fine-tuning time-delay network of the homologous reference frequency-reduction time-delay matching module, a feedback weight control circuit of the compensated value is used, and the modulation vector modulation module generates signals with opposite phases and same amplitude. The invention can solve the technical problems of reducing the complexity of system design, reducing the cost and realizing picosecond-level reference compensation.
Description
Technical Field
The invention relates to the technical field of microwave receiving and transmitting.
Background
The receiving and transmitting of the linear frequency modulation continuous wave radar need the same frequency at the same time, and the problem of serious self-interference of the receiving and transmitting is caused by the insufficient isolation of a receiving and transmitting antenna. In the offset system, an analog adjustable delayer is usually adopted to adjust the system delay matching or an integrated nanosecond delay chip is adopted to perform the system delay matching. An integrated chip is usually adopted in a conventional microwave cancellation system to perform time delay matching of an analog system, and because the system has high working frequency and wide working bandwidth, a nanosecond time delay chip cannot meet the requirement of the system on accurate time delay matching.
In the background art, the chinese patent CN111600620A adopts high frequency compensation delay; the chinese patent CN111600620A does not adopt frequency reduction processing for the reference source, and if the frequency reduction processing is not performed on the high-frequency reference signal, there is no intermediate frequency initial reference, and intermediate frequency delay compensation cannot be accurately adopted.
Disclosure of Invention
The invention aims to provide a frequency conversion time delay compensation method based on a homologous reference in a microwave cancellation system, which aims to solve the technical problems that the complexity of system design can be reduced, the cost is reduced and picosecond-level reference compensation can be realized by carrying out frequency reduction compensation on high-frequency time delay.
In order to achieve the purpose, the invention adopts the following technical scheme:
sampling by a signal sampling module, and respectively sending signals to a vector modulation module and a homologous reference frequency reduction and time delay matching module through a power distribution module; the output signal of the vector modulation module is transmitted to the signal synthesis module, the output signal of the signal synthesis module is sent to a receiving end through the signal feedback module, the homologous reference frequency-reduction delay matching module collects the signals of the signal sampling module, the power distribution module and the signal feedback module, the frequency reduction processing is carried out on the signals, the group delay error of a reference signal and an interference signal is calculated, the error is compensated through a multi-stage picosecond fine-tuning delay network of the homologous reference frequency-reduction delay matching module, the feedback of the compensated value is controlled to the weight control circuit, the weight control circuit modulates the vector modulation module to generate signals with opposite phases and same amplitude, and the purpose of real-time interference cancellation is achieved.
The homologous reference frequency-reduction time-delay matching module is used for extracting signals of the signal sampling module, the signal delayer and the signal feedback module, performing frequency reduction processing on the signals, calculating group delay errors of a reference signal and an interference signal, and compensating through a multi-order picosecond-level fine-tuning time-delay network; the method comprises the following steps:
first, the reference signal is defined as signal1cos wt 1 The reference signal is defined as signal2cos wt 2 The interference signal is defined as signal3cos wt 3 The homologous signal is defined as signal4cos wt;
cos α × cos β ═ 1/2[ cos (α + β) + cos (α - β) ] formula 1
Selecting a required frequency reduction signal through signal filtering according to a formula 1; three down-converted signals are thus obtained, respectively as follows:
signal1×signal4＝cos wt 1 ×cos wt
signal2×signal4＝cos wt 2 ×cos wt
signal3×signal4＝cos wt 3 ×cos wt
the delay time after the frequency down is respectively corresponding to:
T1＝t 1 -t
T2＝t 2 -t
T3＝t 3 -t
t1 is used as a reference signal at the moment and is a source for generating T2 and T3, so that the time delay difference can be quantized into absolute values of T1-T2 and T1-T3; meanwhile, corresponding delay compensation is carried out according to the difference value; if the T1 is not used as a reference signal or a homologous signal is not used, the down-conversion precision time delay compensation cannot be realized.
The weight control circuit is used for respectively decomposing each signal into orthogonal signals through the orthogonal power divider after time delay matching is carried out on the reference signal and the interference signal which are subjected to frequency reduction processing, carrying out correlation operation on the decomposed orthogonal signals, namely detecting the linear correlation of the signals through the linear convolution of the signals, and using a weight operation output result corresponding to the orthogonal signals to control the vector modulator, so that the amplitude and the phase of the output signals are changed, and finally, a counteracting signal which is in equal amplitude and opposite phase with the interference signal is generated.
The invention has the following advantages and positive effects:
in order to enable a microwave cancellation system to meet the requirement that the system achieves accurate time delay matching, a frequency conversion time delay compensation method based on a homologous reference is designed. The method compensates the high-frequency time delay through frequency reduction, not only can reduce the complexity of system design and reduce the cost, but also can realize picosecond-level reference compensation.
Drawings
Fig. 1 is a schematic block diagram of the circuit of the present invention.
In the figure, the unit 1 is a signal sampling module; unit 2 is a power distribution module; the unit 3 is a vector modulation module; the unit 4 is a signal synthesis module; the unit 5 is a homologous reference frequency-reducing time-delay matching module, and the unit 6 is a signal feedback module.
Detailed Description
The specific circuit structure and the working principle of the invention are shown in fig. 1.
The working principle of the invention is as follows: the microwave cancellation device samples through the unit 1 and respectively sends signals to the unit 3 and the unit 5 through the unit 2; the output signal of the unit 3 is transmitted to the unit 4, the output signal of the unit 4 is transmitted to a receiving end through the unit 6, the unit 5 collects the signals of the units 1, 2 and 6, carries out frequency reduction processing on the signals, calculates the group delay error of the reference signal and the interference signal, the error can be compensated through the multi-order picosecond fine tuning delay network of the unit 5, controls the feedback of the compensated value to the weight control circuit, and the weight control circuit modulation unit 3 generates signals with opposite phases and same amplitude to achieve the purpose of real-time interference cancellation. The unit 1 is a signal sampling module; the unit 2 is a power distribution module; the unit 3 is a vector modulation module; the unit 4 is a signal synthesis module; unit 5 is a homologous reference frequency-reducing delay matching module, and unit 6 is a signal feedback module.
The unit 5 is the core of the frequency conversion time delay compensation method based on the same source reference in the microwave cancellation system. The unit 5 has the main functions of extracting the signals of the units 1, 2 and 6, carrying out frequency reduction processing on the signals, calculating group delay errors of reference signals and interference signals, and compensating through a multi-order picosecond fine tuning delay network. The working method of the unit 5:
first, the reference signal is defined as signal1cos wt 1 The reference signal is defined as signal2cos wt 2 The interference signal is defined as signal3cos wt 3 Homologous signal is defined as signal4cos wt;
cos α × cos β ═ 1/2[ cos (α + β) + cos (α - β) ] formula 1
Selecting a required frequency reduction signal through signal filtering according to a formula 1; three down-converted signals are thus obtained, respectively as follows:
signal1×signal4＝cos wt 1 ×cos wt
signal2×signal4＝cos wt 2 ×cos wt
signal3×signal4＝cos wt 3 ×cos wt
the delay time after the frequency reduction is respectively corresponding to:
T1＝t 1 -t
T2＝t 2 -t
T3＝t 3 -t
t1 is used as a reference signal at the moment and is a source for generating T2 and T3, so that the time delay difference can be quantized into absolute values of T1-T2 and T1-T3; meanwhile, corresponding delay compensation is carried out according to the difference value; if the T1 is not used as a reference signal or a homologous signal is not used, the down-conversion precision time delay compensation cannot be realized.
The operation principle of the weight control circuit is as follows: after time delay matching is carried out on the reference signal and the interference signal which are subjected to frequency reduction processing, each signal is respectively decomposed into orthogonal signals through an orthogonal power divider, correlation operation (which means linear correlation of the signals is detected through linear convolution of the signals) is carried out on the orthogonal signals after decomposition, a weight operation output result corresponding to the orthogonal signals is used for controlling a vector modulator, the amplitude and the phase of the output signals are changed, and finally a counteracting signal which is in equal amplitude and opposite phase with the interference signal is generated.
The key to whether the cancellation signal can reach equal-amplitude phase reversal with the interference signal in the system operation process is delay matching, which determines the accuracy of weight control output in the signal correlation operation process, and the stronger the correlation, the higher the control accuracy, and the system performance and efficiency can be fully exerted.
Claims (3)
1. A frequency conversion time delay compensation method based on homologous reference in a microwave cancellation system is characterized in that sampling is carried out through a signal sampling module, and signals are respectively sent to a vector modulation module and a homologous reference frequency reduction time delay matching module through a power distribution module; the output signal of the vector modulation module is transmitted to the signal synthesis module, the output signal of the signal synthesis module is sent to a receiving end through the signal feedback module, the homologous reference frequency-reduction time-delay matching module collects the signals of the signal sampling module, the power distribution module and the signal feedback module and carries out frequency reduction processing on the signals, group delay errors of reference signals and interference signals are calculated, the group delay errors are compensated through a multi-order picosecond-level fine-tuning time-delay network of the homologous reference frequency-reduction time-delay matching module, the feedback of the compensated values is controlled to the weight control circuit, the weight control circuit modulates the vector modulation module to generate signals with opposite phases and same amplitude, and the purpose of real-time interference cancellation is achieved.
2. The frequency conversion delay compensation method based on the homologous reference in the microwave cancellation system according to claim 1, wherein the homologous reference frequency-reduction delay matching module extracts signals of the signal sampling module, the signal delay device and the signal feedback module, performs frequency reduction on the signals, calculates group delay errors of the reference signal and the interference signal, and compensates through a multi-order picosecond fine-tuning delay network; the method comprises the following steps:
first, the reference signal is defined as signal1coswt 1 The reference signal is defined as signal2coswt 2 The interference signal is defined as signal3coswt 3 The homologous signal is defined as signal4 coswt;
cos α × cos β ═ 1/2[ cos (α + β) + cos (α - β) ] formula 1
Selecting a required frequency reduction signal through signal filtering according to a formula 1; three down-converted signals are thus obtained, respectively as follows:
signal1×signal4＝coswt 1 ×coswt
signal2×signal4＝coswt 2 ×coswt
signal3×signa14＝coswt 3 ×coswt
the delay time after the frequency down is respectively corresponding to:
T1＝t 1 -t
T2＝t 2 -t
T3＝t 3 -t
at this time, T1 is used as a reference signal and is a source for generating T2 and T3, so that what needs to be compensated is that the time delay difference can be quantized into absolute values of T1-T2 and T1-T3; meanwhile, corresponding delay compensation is carried out according to the difference value; if there is no T1 as the reference signal or there is no homologous signal, the fine down delay compensation can not be realized.
3. The frequency conversion delay compensation method based on the homologous datum in the microwave cancellation system according to claim 1, wherein the weight control circuit performs delay matching on the reference signal and the interference signal after frequency reduction processing, decomposes each signal into orthogonal signals through an orthogonal power divider, performs correlation operation on the decomposed orthogonal signals, that is, detects linear correlation of the signals through linear convolution of the signals, and uses a weight operation output result corresponding to the orthogonal signals to control the vector modulator, so as to change the amplitude and phase of the output signal, and finally generates the cancellation signal with equal amplitude and opposite phase to the interference signal.
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Citations (4)
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|---|---|---|---|---|
| US6219376B1 (en) * | 1998-02-21 | 2001-04-17 | Topcon Positioning Systems, Inc. | Apparatuses and methods of suppressing a narrow-band interference with a compensator and adjustment loops |
| CN102347778A (en) * | 2011-08-05 | 2012-02-08 | 中国舰船研究设计中心 | Self-adapting interference cancellation device and debugging method thereof |
| CN104486273A (en) * | 2014-12-11 | 2015-04-01 | 中国传媒大学 | Self-adaptive direct quadrature variable-frequency modulation error correction method |
| CN112953578A (en) * | 2021-01-22 | 2021-06-11 | 成都天奥信息科技有限公司 | Ground-air communication self-adaptive radio frequency interference canceller and optimization method thereof |
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- 2022-05-20 CN CN202210548550.1A patent/CN115001527B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6219376B1 (en) * | 1998-02-21 | 2001-04-17 | Topcon Positioning Systems, Inc. | Apparatuses and methods of suppressing a narrow-band interference with a compensator and adjustment loops |
| CN102347778A (en) * | 2011-08-05 | 2012-02-08 | 中国舰船研究设计中心 | Self-adapting interference cancellation device and debugging method thereof |
| CN104486273A (en) * | 2014-12-11 | 2015-04-01 | 中国传媒大学 | Self-adaptive direct quadrature variable-frequency modulation error correction method |
| CN112953578A (en) * | 2021-01-22 | 2021-06-11 | 成都天奥信息科技有限公司 | Ground-air communication self-adaptive radio frequency interference canceller and optimization method thereof |
Non-Patent Citations (2)
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| 李毅;何方敏;唐健;李建轩;孟进;: "矢量调制器自适应前馈线性化技术研究", 船电技术, no. 09, 15 September 2015 (2015-09-15) * |
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