CN111030625B - Self-adaptive multi-element orthogonal wave trap and wave trapping method thereof - Google Patents
Self-adaptive multi-element orthogonal wave trap and wave trapping method thereof Download PDFInfo
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
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Abstract
The invention relates to an adaptive multi-element orthogonal trap, comprising: an input coupling unit, an orthogonal notch unit, an output coupling unit and a detection control unit; the antenna signal is input to the input end of the input coupling unit, the first output end of the input coupling unit is connected with the signal end of the orthogonal notch unit, the second output end of the input coupling unit is connected with the input end of the detection control unit, and the orthogonal notch unit is used for executing orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit and transmitting the obtained useful signal to the output coupling unit. The invention comprises an orthogonal notch unit and a detection control unit, wherein the orthogonal notch unit executes orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit, and transmits the obtained useful signal to the output coupling unit, thereby realizing low-loss transmission of the useful signal and reflection suppression of the interference signal.
Description
Technical Field
The invention relates to the technical field of antenna signal filtering processing, in particular to a self-adaptive multi-element orthogonal trap and a trap method thereof.
Background
Due to rapid development and popularization of current communication technologies, wifi, bluetooth, communication phones, broadcasting, etc. which are visible everywhere in daily life of people, strong interference (including unintentional and malicious interference signals) exists in various communication and electronic countermeasures, and anti-interference measures and technologies are becoming increasingly important.
The current anti-interference technology is not only capable of improving the field intensity of a received signal (such as strengthening the intensity of a transmitted signal or improving the gain of an antenna), shielding and isolating an interference signal, and performing filtering processing on the interference signal at the front end of a receiving system. The filtering process at the front end of the system adopts a filter mode to perform filtering (such as a narrow-band processing technology, etc.). The filter processing mode has the problem of certain passband stop band isolation, can greatly narrow the usable signal bandwidth, and can not solve the interference problem in the passband of the filter. The filtering mode is not perfect enough to solve the interference signal under the broadband condition: the filtering suppression is usually performed on a band of the channel, and the signal bandwidth is only on the filtering passband (the band of the stopband belongs to the blocking suppression state and cannot be used for communication), and if the signal bandwidth is needed, the frequency is needed to be switched to replace the filter band. The filtering mode of combining multiple multi-stage filters is adopted to strengthen the filtering of interference signals, so that the problems of more complex circuit design, related reliability and the like are brought to a receiver circuit; meanwhile, the prior art cannot effectively filter out unknown interference signals, and the problems of large passband loss, communication quality degradation and the like caused by overlarge passband loss are also brought when the anti-interference problem is treated by adopting a narrow-band technology respectively.
Therefore, there is an urgent need in the industry to develop a method or apparatus that can implement automatic filtering processing for unknown interference signals without affecting full-band operation.
Disclosure of Invention
Aiming at the problem that the filtering mode in the prior art uniformly suppresses and filters the interference signal to the channel of a certain frequency band, the invention provides the self-adaptive multi-element orthogonal trap.
The specific scheme of the application is as follows:
an adaptive multi-element orthogonal trap, comprising: an input coupling unit, an orthogonal notch unit, an output coupling unit and a detection control unit; the antenna signal is input to the input end of the input coupling unit, the first output end of the input coupling unit is connected with the signal end of the orthogonal notch unit, the second output end of the input coupling unit is connected with the input end of the detection control unit, the output end of the detection control unit is connected with the control end of the orthogonal notch unit, the output end of the orthogonal notch unit is connected with the input end of the output coupling unit, and the output end of the output coupling unit is connected with the receiver; the output end of the output coupling unit and the output end of the receiver are both connected with the detection control unit; the orthogonal notch unit is used for executing orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit, and transmitting the obtained useful signal to the output coupling unit.
Preferably, the input coupling unit is a coupler; the antenna signal is input to one end of a primary coil of the coupler, the other end of the primary coil of the transformer is connected with a signal end of the orthogonal notch unit, one end of a secondary coil of the coupler is connected to the ground, the other end of the secondary coil of the coupler is connected to the ground through a resistor, and the other end of the secondary coil of the coupler is connected with an input end of the detection control unit.
Preferably, the detection control unit comprises an amplifier, an A/D converter and a processor which are connected in sequence; the other end of the coupler secondary coil is connected with the input end of the amplifier, and the output end of the processor is connected with the control end of the orthogonal notch unit.
Preferably, the orthogonal notch unit includes: a quadrature bridge and two identical tunable resonators; the first output end of the input coupling unit is connected with the input end of the quadrature bridge; the output end of the quadrature bridge is connected with the input end of the output coupling unit, and the positive phase shifting end and the negative phase shifting end of the quadrature bridge are respectively connected with the two adjustable resonators.
Preferably, the quadrature bridge comprises: the device comprises a magic T transformer and two phase shifters, wherein the two phase shifters have the same network structure but the element values of corresponding elements are different; the two phase shifters are respectively connected to the positive phase shifting end and the negative phase shifting end of the magic T transformer, the first output end of the input coupling unit is connected with the input end of the magic T transformer, the output end of the magic T transformer is connected with the input end of the output coupling unit, and the output ends of the two phase shifters are respectively connected to the two adjustable resonators.
Preferably, the magic T-transformer comprises: a first transformer, a second transformer and a third transformer; the phase shifter comprises a first capacitor, a second capacitor, a first inductor and a second inductor; the first inductance is a coupling inductance; one end of a primary coil of the first transformer is connected to the ground, one end of a secondary coil of the first transformer is connected with a first output end of the input coupling unit, the other end of the primary coil of the first transformer is connected with one end of a primary coil of the second transformer, the other end of a primary coil of the third transformer is connected with the other end of the primary coil of the second transformer, the other end of the secondary coil of the third transformer is connected with the input end of the output coupling unit, one end of the secondary coil of the second transformer and one end of the primary coil of the third transformer are connected to the ground, and the other end of the secondary coil of the first transformer is connected with one end of the secondary coil of the third transformer and the other end of the secondary coil of the second transformer; one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with the two adjustable resonators through a first capacitor, two ends of a first inductor are connected to two ends of the first capacitor, and the middle end of the first inductor is connected to the ground through a second inductor and the second capacitor in sequence.
Preferably, the tunable resonator includes a third inductance, a fourth inductance, and a third capacitance; the fourth inductor is a coupling inductor, and the third capacitor is a variable capacitor; one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with one end of a third inductor through a first capacitor, the other end of the third inductor is connected with the middle end of a fourth inductor, two ends of the fourth inductor are connected through a third capacitor, and one end of the fourth inductor is also connected to the ground.
A method of trapping an adaptive multi-element orthogonal trap, comprising:
s1, an input coupling unit couples signals out of coupling signals and transmits the coupling signals to a detection control unit and an orthogonal notch unit respectively;
s2, the detection control unit sequentially amplifies and analog-digital converts the coupling signals, and the processor judges signals subjected to analog-digital conversion; if the signal after the analog-to-digital conversion is judged to contain the interference signal, executing a step S3;
s3, the processor outputs a control instruction to the orthogonal notch unit according to the judging result;
s4, the orthogonal notch unit executes notch on the coupling signal according to the control instruction;
s5, the orthogonal notch unit outputs a notch signal, and the notch signal is connected to the receiver through the output coupling unit.
Preferably, step S4 includes:
s41, after the antenna signal is input into the input end of the quadrature bridge, the antenna signal is distributed to the positive phase shifting end and the negative phase shifting end of the quadrature bridge by the equal-power quadrature phase, and then the antenna signal is respectively transmitted to two adjustable resonators; wherein the antenna signal comprises a frequency f 0 And a useful signal of frequency f 1 Is a signal of interference of (1);
s42, the antenna signal is at frequency f in the tunable resonator 1 Nearby resonance occurs, the interference signals of the two tunable resonators are at frequency f 1 The reflections at the two tunable resonators have a 'constant amplitude inversion' relationship, and the useful signal of the two tunable resonators is at a frequency f 1 The reflection at the position has a constant amplitude and phase relationship;
s43, the interference signals at two positions are reflected by the adjustable resonator and then are combined and output at the input end of the quadrature bridge in phase, and the useful signals at two positions are reflected by the adjustable resonator and then are combined and output to the output coupling unit at the output end of the quadrature bridge in phase.
Preferably, if the signal after analog-to-digital conversion does not contain an interference signal, the processor does not output a control instruction, and the coupling signal is sequentially transmitted to the receiver through the orthogonal notch unit and the output coupling unit.
Compared with the prior art, the invention has the following beneficial effects:
the invention comprises an orthogonal notch unit and a detection control unit, wherein the orthogonal notch unit executes orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit, and transmits the obtained useful signal to the output coupling unit, thereby realizing low-loss transmission of the useful signal and reflection suppression of the interference signal. The automatic notch processing for unknown interference signals is perfectly realized under the condition of not affecting the full-band operation. The invention can be applied to the radio station receiver of the carrier-based communication system, and can obviously inhibit the short-wave radio station from receiving interference signals, improve the receiving performance of the receiver, enhance the receiving communication effect and improve the conversation quality of the voice radio station.
Drawings
Fig. 1 is a schematic block diagram of an adaptive multi-element orthogonal trap of the present invention.
Fig. 2 is a circuit diagram of the input coupling unit and the detection control unit of the present invention.
Fig. 3 is a schematic diagram of an orthogonal notch cell of the present invention.
Fig. 4 is a circuit diagram of the magic T-transformer of the present invention.
Fig. 5 is a circuit diagram of the phase shifter of the present invention.
Fig. 6 is a circuit diagram of the quadrature bridge of the present invention.
Fig. 7 (a) is a circuit diagram of a conventional series resonance.
Fig. 7 (b) is a circuit diagram of a conventional parallel resonance.
Fig. 8 is a schematic diagram of a tunable resonator of the present invention.
Fig. 9 is a circuit diagram of an orthogonal notch cell of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The scheme adopts the detection control unit to identify complex and changeable interference signals, and utilizes the simplest LC resonance reflection type wave trap to realize effective notch filtering (the notch amplitude is more than 20 dB) on the interference signals in an orthogonal notch mode. Therefore, under the conditions that the receiving quality of a receiver is not reduced and the normal use of a broadband full-screen section is ensured, the received signal is sampled, detected and targeted notch is realized, and interference signals can be effectively identified and filtered to be reduced by more than 100 times, so that the effects of not changing the channel bandwidth of communication, inhibiting unknown interference signals without switching the frequency range of a system and improving the communication quality are realized. The specific scheme is as follows:
referring to fig. 1, an adaptive multi-element orthogonal trap, comprising: an input coupling unit, an orthogonal notch unit, an output coupling unit and a detection control unit; the antenna signal is input to the input end of the input coupling unit, the first output end of the input coupling unit is connected with the signal end of the orthogonal notch unit, the second output end of the input coupling unit is connected with the input end of the detection control unit, the output end of the detection control unit is connected with the control end of the orthogonal notch unit, the output end of the orthogonal notch unit is connected with the input end of the output coupling unit, and the output end of the output coupling unit is connected with the receiver; the output end of the output coupling unit and the output end of the receiver are both connected with the detection control unit; the orthogonal notch unit is used for executing orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit, and transmitting the obtained useful signal to the output coupling unit.
In this embodiment, referring to fig. 2, the input coupling unit is a coupler OC; the antenna signal is input to one end of a primary coil of the coupler OC, the other end of the primary coil of the transformer is connected with a signal end of the orthogonal notch unit, one end of a secondary coil of the coupler OC is connected to the ground, the other end of the secondary coil of the coupler OC is connected to the ground through a resistor R, and the other end of the secondary coil of the coupler OC is connected with an input end of the detection control unit. The detection control unit comprises an amplifier AMP, an A/D converter and a processor ARM which are sequentially connected; the other end of the coupler OC secondary coil is connected with the input end of the amplifier AMP, and the output end of the processor ARM is connected with the control end of the orthogonal notch unit. The scheme adopts a radio frequency direct sampling method, outputs a small signal through a coupler OC, properly amplifies the small signal through an AMP (amplifier) circuit, samples the small signal through a digital-to-analog conversion circuit, and finally outputs the small signal to an ARM for relevant control processing. In practical design, the secondary turns N of the coupler OC can be adjusted to change the coupled output power to be smaller than the maximum unsaturated input power value of the analog-to-digital converter.
The output coupling unit and the input coupling unit have the same circuit, and the output coupling unit is a coupler.
Coupling an antenna signal received by an antenna through a coupler OC of an input coupling unit to obtain a small signal (coupling signal), and then sending the small signal to a detection control unit; the detection control unit sequentially amplifies the coupling signals by adopting a broadband scanning technology, performs analog-to-digital conversion, performs FFT analysis processing on AD data after the analog-to-digital conversion, screens out strong interference scrambling point information, transmits the strong interference scrambling point information to the ARM processing processor, and outputs control signals to the orthogonal notch unit according to the frequency point amplitude by the ARM processor, and the orthogonal notch unit performs notch. After the antenna signal is connected to the multipath notch unit, the notch effect can be confirmed through the output coupling circuit, and the parameter optimization adjustment is performed through the detection control unit again until the receiving channel state reaches the relative optimal state, so that the self-adaptive notch flow is completed.
In this embodiment, as shown in fig. 3, the orthogonal notch unit includes: a quadrature bridge 11 and two identical tunable resonators 12; the first output end of the input coupling unit is connected with the input end A of the quadrature bridge 11; the output end B of the quadrature bridge 11 is connected with the input end of the output coupling unit, and the positive phase-shifting end C and the negative phase-shifting end D of the quadrature bridge 11 are respectively connected with two adjustable resonators 12.
The working principle of the orthogonal notch unit for notch is as follows: the antenna receiving the signal (including frequency f 0 And a useful signal of frequency f 1 Is a signal of interference of (1); ) The input end of the quadrature bridge 11 is input and distributed to a positive phase shifting end C and a negative phase shifting end D of the quadrature bridge 11 by equal power quadrature phase, and then the input end is respectively transmitted to two adjustable resonators 12; by tuning the resonator 12 to a frequency f 1 The interference signals of the two resonators are reflected by the resonators and have a 'constant amplitude and opposite Phase' relation (i.e. Mag (S (1, 1))=mag (S (2, 2)), phase (S (1, 1)) -Phase (S (2, 2))=180 DEG), the reflection characteristics of the useful signals outside the resonance bandwidth have a 'constant amplitude and in-Phase' relation (i.e. Mag (S (1, 1))=mag (S (2, 2)), phase (S (1, 1)) -Phase (S (2, 2))=0 DEG), so that the interference signals are reflected by the resonators and are in-Phase combined and output at the input end of the quadrature bridge 11, no output is achieved at the output end of the quadrature bridge 11, reflection inhibition of the interference signals by the notch unit is achieved, and the useful signals are in a 'constant amplitude' relation and in-Phase combined and output at the output end of the quadrature bridge 11, no output is achieved at the input end of the notch unit is out of the frequency of the useful signalsWith no reflection transmission of the signal.
In this embodiment, as shown in fig. 4, the quadrature bridge 11 includes: the device comprises a magic T transformer and two phase shifters, wherein the two phase shifters have the same network structure but the element values of corresponding elements are different; the two phase shifters are respectively connected to the positive phase shifting end C and the negative phase shifting end D of the magic T transformer, the first output end of the input coupling unit is connected with the input end of the magic T transformer, the output end of the magic T transformer is connected with the input end of the output coupling unit, and the output ends of the two phase shifters are respectively connected to the two adjustable resonators 12. Since the two equal power separating ends (positive phase shifting end C and negative phase shifting end D) of the magic T transformer output a phase difference of 180 ° instead of ±90° of the quadrature bridge 11, a pair of phase shifters with a phase difference of 90 ° is required to be connected to the two separating ends to realize the "quadrature" phase characteristic relationship. In addition, in the case that the impedances of the four ports of the magic T-transformer are not uniform, it is necessary to perform impedance transformation on the corresponding ports so as to match the system impedance. According to the theory of a theoretical transmission line transformer, in order to achieve the optimization of the distribution and synthesis performance of the same power and phase, a three-transformer type magic T design mode is adopted.
In this embodiment, the magic T transformer includes: a first transformer T1, a second transformer T2, and a third transformer T3; the phase shifter comprises a first capacitor C1', a second capacitor C2', a first inductor L1 'and a second inductor L2'; the first inductor L1' is a coupling inductor; one end of a primary coil of the first transformer T1 is connected to the ground, one end of a secondary coil of the first transformer T1 is connected with a first output end of an input coupling unit, the other end of the primary coil of the first transformer T1 is connected with one end of a primary coil of the second transformer T2 and the other end of a primary coil of the third transformer T3, the other end of the primary coil of the second transformer T2 and the other end of the secondary coil of the third transformer T3 are connected with an input end of the output coupling unit, one end of a secondary coil of the second transformer T2 and one end of a primary coil of the third transformer T3 are connected to the ground, and the other end of the secondary coil of the first transformer T1 and the other end of the secondary coil of the third transformer T3 are connected with the other end of the secondary coil of the second transformer T2; one end of the primary coil of the second transformer T2 and one end of the secondary coil of the third transformer T3 are respectively connected with the two adjustable resonators 12 through a first capacitor C1', two ends of a first inductor L1' are connected to two ends of the first capacitor C1', and the middle end of the first inductor L1' is connected to the ground through a second inductor L2 'and a second capacitor C2' in sequence.
The differential phase shift network is the two-order all-pass phase shift network shown in FIG. 5, when the serial arm resonant frequency is the same as the parallel arm resonant frequency, i.e. f 0 ＝L 1 ·C 1 ＝L 2 ·C 2 The phase shift is monotonic with frequency, by taking the appropriate value for the coefficient m (m=l 2 /L 1 ＝C 2 /C 1 ) The slope change of the phase shift-frequency relation can be made small, which is of great importance for the phase shift network to be able to operate over a wide frequency band. Two phase shifting networks with the same network structure but different element values can calculate m and f through design indexes 1 And f 2 And further obtaining corresponding element values so that the phase shift difference of the two phase shift networks remains approximately pi/2 within the desired frequency range. Theoretical values of the phase shift network with the phase shift of 90+/-3 DEG in the short-wave frequency range can be obtained through theoretical calculation.
Based on the previous analysis, the magic-T transformer and the phase shifter described above can be combined to form a quadrature bridge 11, as shown in fig. 6.
In the present embodiment, the tunable resonator 12 includes a third inductance L3', a fourth inductance L4', and a third capacitance C3'; the fourth inductor L4 'is a coupling inductor, and the third capacitor C3' is a variable capacitor; one end of the primary coil of the second transformer T2 and one end of the secondary coil of the third transformer T3 are respectively connected with one end of a third inductor L3' through a first capacitor C1', the other end of the third inductor L3' is connected with the middle end of a fourth inductor L4', two ends of the fourth inductor L4' are connected through a third capacitor C3', and one end of the fourth inductor L4' is also connected to the ground.
Design of the tunable resonator 12: there are mainly two implementations of the tuner, namely series resonance and parallel resonance, as shown in fig. 7 (a) and 7 (b). Wherein r is the parasitic resistance on the inductor; since the Q value of the capacitor is much higher than the inductance, it is assumed that the capacitor is an ideal device, without parasitic resistance.
As can be seen from the theory of circuit analysis, the resonance impedance at the time of series resonance is Z 0 Because r is the parasitic resistance on the inductance L is typically small (< 1Ω), the real part of the impedance of the series resonant circuit at the resonant frequency accessory is much smaller than 50 ohms, and it is difficult to achieve impedance matching at the resonant frequency accessory through a transformer; meanwhile, the parallel resonant circuit has high impedance with respect to the series impedance at the impedance z0=l/(c·r) of resonance, and therefore impedance matching at the resonance frequency is easy to realize. The parallel resonant mode is thus chosen here as resonator design.
According to the analysis, the parallel resonant circuit realizes the impedance transformation ratio by means of a tap inductance, and the impedance matching of the parallel resonant circuit at the resonant frequency accessory can be finally realized by adding the series inductance to counteract the impedance imaginary part, as shown in fig. 8, and the adjustable function is realized by changing the capacitance value of the resonator.
The positive phase-shifting terminal C and the negative phase-shifting terminal D of the quadrature bridge 11 are connected to the tunable parallel resonator, as shown in fig. 9, thereby realizing the quadrature notch unit.
A trapping method of the adaptive multi-element orthogonal trap based on the adaptive multi-element orthogonal trap comprises the following steps:
s1, an input coupling unit couples signals out of coupling signals and transmits the coupling signals to a detection control unit and an orthogonal notch unit respectively;
s2, the detection control unit sequentially amplifies and analog-digital converts the coupling signals, and the processor ARM judges signals subjected to analog-digital conversion; if the signal after the analog-to-digital conversion is judged to contain the interference signal, executing a step S3;
s3, the processor ARM outputs a control instruction to the orthogonal notch unit according to the judging result;
s4, the orthogonal notch unit executes notch on the coupling signal according to the control instruction;
s5, the orthogonal notch unit outputs a notch signal, and the notch signal is connected to the receiver through the output coupling unit.
In this embodiment, step S4 includes:
s41, after the antenna signal is input into the input end A of the quadrature bridge 11, the antenna signal is distributed to the positive phase shifting end C and the negative phase shifting end D of the quadrature bridge 11 by equal power quadrature phases, and then the antenna signal is respectively transmitted to the two adjustable resonators 12; wherein the antenna signal comprises a frequency f 0 And a useful signal of frequency f 1 Is a signal of interference of (1);
s42, the antenna signal is at frequency f in the tunable resonator 12 1 Near resonance occurs, the interference signals of the two tunable resonators 12 are at frequency f 1 The reflections at this point have a "constant amplitude anti-phase" relationship and the useful signals of the two tuneable resonators 12 are at a frequency f 1 The reflection at the position has a constant amplitude and phase relationship;
s43, the two interference signals are reflected by the tunable resonator 12 and then are combined in phase at the input end A of the quadrature bridge 11, and the two useful signals are reflected by the tunable resonator 12 and then are combined in phase at the output end B of the quadrature bridge 11 and output to the output coupling unit.
In this embodiment, if it is determined that the signal after the analog-to-digital conversion does not include an interference signal, the processor ARM does not output a control instruction, and the coupling signal is sequentially transmitted to the receiver through the orthogonal notch unit and the output coupling unit.
In summary, the adaptive multi-element orthogonal trap of the scheme is developed based on the front-end filtering processing technology, but can ensure that the interference signal is subjected to target trap suppression under the condition of broadband radio frequency communication, ensure that the communication frequency phase amplitude is unchanged, realize effective trap processing on the interference signal under the condition that the communication quality of the broadband is not affected, and improve the anti-interference capability of the receiver.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. An adaptive multi-element orthogonal trap, comprising: an input coupling unit, an orthogonal notch unit, an output coupling unit and a detection control unit;
the antenna signal is input to the input end of the input coupling unit, the first output end of the input coupling unit is connected with the signal end of the orthogonal notch unit, the second output end of the input coupling unit is connected with the input end of the detection control unit, the output end of the detection control unit is connected with the control end of the orthogonal notch unit, the output end of the orthogonal notch unit is connected with the input end of the output coupling unit, and the output end of the output coupling unit is connected with the receiver; the output end of the output coupling unit and the output end of the receiver are both connected with the detection control unit;
the orthogonal notch unit is used for executing orthogonal notch on the antenna signal after receiving the control instruction output by the detection control unit and transmitting the obtained useful signal to the output coupling unit;
the orthogonal notch unit includes: a quadrature bridge and two identical tunable resonators;
the first output end of the input coupling unit is connected with the input end of the quadrature bridge; the output end of the quadrature bridge is connected with the input end of the output coupling unit, and the positive phase shifting end and the negative phase shifting end of the quadrature bridge are respectively connected with the two adjustable resonators;
the input coupling unit is a coupler; the antenna signal is input to one end of a primary coil of the coupler, the other end of the primary coil of the transformer is connected with a signal end of the orthogonal notch unit, one end of a secondary coil of the coupler is connected to the ground, the other end of the secondary coil of the coupler is connected to the ground through a resistor, and the other end of the secondary coil of the coupler is connected with an input end of the detection control unit;
the quadrature bridge comprises: the device comprises a magic T transformer and two phase shifters, wherein the two phase shifters have the same network structure but the element values of corresponding elements are different;
the two phase shifters are respectively connected to the positive phase shifting end and the negative phase shifting end of the magic T transformer, the first output end of the input coupling unit is connected with the input end of the magic T transformer, the output end of the magic T transformer is connected with the input end of the output coupling unit, and the output ends of the two phase shifters are respectively connected to the two tunable oscillators;
the magic T-transformer comprises: a first transformer, a second transformer and a third transformer; the phase shifter comprises a first capacitor, a second capacitor, a first inductor and a second inductor; the first inductance is a coupling inductance;
one end of a primary coil of the first transformer is connected to the ground, one end of a secondary coil of the first transformer is connected with a first output end of the input coupling unit, the other end of the primary coil of the first transformer is connected with one end of a primary coil of the second transformer, the other end of a primary coil of the third transformer is connected with the other end of the primary coil of the second transformer, the other end of the secondary coil of the third transformer is connected with the input end of the output coupling unit, one end of the secondary coil of the second transformer and one end of the primary coil of the third transformer are connected to the ground, and the other end of the secondary coil of the first transformer is connected with one end of the secondary coil of the third transformer and the other end of the secondary coil of the second transformer;
one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with the two adjustable resonators through a first capacitor, two ends of a first inductor are connected to two ends of the first capacitor, and the middle end of the first inductor is connected to the ground through a second inductor and the second capacitor in sequence.
2. The adaptive multi-element orthogonal trap of claim 1, wherein the detection control unit comprises an amplifier, an a/D converter, and a processor connected in sequence;
the other end of the coupler secondary coil is connected with the input end of the amplifier, and the output end of the processor is connected with the control end of the orthogonal notch unit.
3. The adaptive multi-element orthogonal trap of claim 1, wherein the tunable resonator comprises a third inductance, a fourth inductance, and a third capacitance; the fourth inductor is a coupling inductor, and the third capacitor is a variable capacitor;
one end of a primary coil of the second transformer and one end of a secondary coil of the third transformer are respectively connected with one end of a third inductor through a first capacitor, the other end of the third inductor is connected with the middle end of a fourth inductor, two ends of the fourth inductor are connected through a third capacitor, and one end of the fourth inductor is also connected to the ground.
4. A method of trapping an adaptive multi-element orthogonal trap as claimed in any one of claims 1 to 3, comprising:
s1, an input coupling unit couples signals out of coupling signals and transmits the coupling signals to a detection control unit and an orthogonal notch unit respectively;
s2, the detection control unit sequentially amplifies and analog-digital converts the coupling signals, and the processor judges signals subjected to analog-digital conversion; if the signal after the analog-to-digital conversion is judged to contain the interference signal, executing a step S3;
s3, the processor outputs a control instruction to the orthogonal notch unit according to the judging result;
s4, the orthogonal notch unit executes notch on the coupling signal according to the control instruction;
s5, the orthogonal notch unit outputs a notch signal, and the notch signal is connected to the receiver through the output coupling unit.
5. The notch method of claim 4 wherein step S4 comprises:
s41, after the antenna signal is input into the input end of the quadrature bridge, the antenna signal is distributed to the positive phase shifting end and the negative phase shifting end of the quadrature bridge by the equal-power quadrature phase, and then the antenna signal is respectively transmitted to two adjustable resonators; wherein the antenna signal comprises a frequency off 0 Is of the useful signal and frequency off 1 Is a signal of interference of (1);
s42, the antenna signal is adjustableAt frequency in resonatorf 1 Nearby resonance occurs, the interference signals of the two tunable resonators are at frequencyf 1 The reflections at the two tunable resonators have a 'constant amplitude anti-phase' relationship, and the useful signals of the two tunable resonators are in frequencyf 1 The reflection at the position has a constant amplitude and phase relationship;
s43, the interference signals at two positions are reflected by the adjustable resonator and then are combined and output at the input end of the quadrature bridge in phase, and the useful signals at two positions are reflected by the adjustable resonator and then are combined and output to the output coupling unit at the output end of the quadrature bridge in phase.
6. The notch method of claim 4 wherein if the analog-to-digital converted signal is determined to not include an interfering signal, the processor does not output a control command, and the coupled signal is transmitted to the receiver sequentially through the orthogonal notch unit and the output coupling unit.
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