CN111988033A - Self-adaptive anti-interference circuit - Google Patents
Self-adaptive anti-interference circuit Download PDFInfo
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- CN111988033A CN111988033A CN202010873531.7A CN202010873531A CN111988033A CN 111988033 A CN111988033 A CN 111988033A CN 202010873531 A CN202010873531 A CN 202010873531A CN 111988033 A CN111988033 A CN 111988033A
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- 230000008859 change Effects 0.000 claims description 5
- 230000002452 interceptive effect Effects 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 230000004721 adaptive immunity Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
- H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
- H03L7/0991—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider
- H03L7/0992—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider comprising a counter or a frequency divider
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Abstract
The invention relates to a self-adaptive anti-interference circuit which comprises an adjustable anti-interference circuit and an interference signal detection circuit, wherein the interference signal detection circuit detects and tracks an interference signal by utilizing the frequency locking characteristic of a phase-locked loop, and converts a detection result into a control signal to control an adjustable anti-interference circuit network of the adjustable anti-interference circuit so as to realize self-adaptive anti-interference. The circuit shortens the time consumption of the whole self-adaptive anti-interference scheme to a microsecond level, and compared with the traditional self-adaptive anti-interference circuit, the circuit has the advantages of short time consumption, low complexity, low power consumption and the like.
Description
Technical Field
The invention relates to a self-adaptive anti-interference circuit, belonging to the field of circuits and systems, in particular to the technical field of micro-electronics and solid-state electronics microwave/radio frequency/millimeter wave integrated circuits.
Background
In recent years, technologies such as wireless mobile communication, satellite communication, and automobile anti-collision radar have been developed rapidly, portable terminals such as smart phones and tablet computers have become indispensable tools in daily life, more and more spectrum resources are put into use, and the spectrum becomes more crowded. Due to the coexistence of multiple wireless systems, the application scenario is complex, and each transceiver faces severe interference of other transceivers and also needs to bear self-interference of itself. The anti-jamming technology is the core and key technology in the design of wireless transceivers.
Meanwhile, with the development and progress of science and technology, the mobile terminal is continuously developed towards generalization, miniaturization and integration, which leads to more complex application scenarios of the mobile terminal, and the frequency of the interference signal is unknown and may dynamically change in a wider frequency range. The traditional radio equipment is anti-interference, and the adoption of an off-chip SAW array leads to large volume, high cost and discontinuous and adjustable frequency band of the equipment especially when the equipment is applied in a wide working frequency range, which brings obstacles to the integration and generalization of a mobile terminal, and the problem becomes more serious along with the increase of various new functions. Therefore, the mobile terminal needs an adjustable anti-interference module to cope with dynamic changes of interference signals, and adaptive anti-interference is achieved. The self-adaptive anti-interference technology is an important technology urgently required in the radio field at present and in the future, and has important significance on mobile communication, radar and comprehensive integrated electronic warfare systems.
The self-adaptive anti-interference technology is used for detecting and tracking the frequency of an interference signal, quickly and automatically adjusting an adjustable anti-interference circuit network according to the frequency change of the interference signal and effectively inhibiting the dynamically changed interference signal. The traditional self-adaptive anti-interference mechanism detects interference signals based on an observation receiver, and after the interference signals are analyzed and processed through a baseband algorithm, a frequency and bandwidth adjustable circuit network is adjusted to complete detection and tracking of the interference signals and realize self-adaptive anti-interference. Meanwhile, the traditional adaptive anti-interference scheme comprises a complete receiver, an ADC and a baseband, the power consumption is high, the structure is complex, and the low power consumption and the low complexity are also research requirements of the adaptive anti-interference technology.
South China university filed a patent related to the present invention, with patent numbers: CN110677216A (digital rf front end and rf signal frequency detection method for electronic countermeasure). The radio frequency detection module in the patent comprises n reference signal modules, n high-speed comparators, a digital signal processing module and a maximum power detection module, wherein the digital signal processing module carries out FFT processing on n results of the high-speed comparators to obtain n frequency spectrums, and all the frequency spectrums are superposed to obtain new frequency spectrums. The radio frequency detection module has a complex structure and consumes a long time in the detection process. The Beijing institute of telemetry applies for a patent related to the present invention, the patent numbers are: CN106134518B (a direct sequence spread spectrum receiver narrowband interference suppression device and method). The interference suppression module in the patent comprises a digital-to-analog conversion module, an AGC loop, an anti-interference digital filtering module, a self-adaptive filtering parameter calculation module and a delay compensation unit. The tenth research institute of china electronic science and technology group company applies for a patent related to the present invention, and the patent numbers are: CN110412620A (anti-interference antenna signal processing device). The self-adaptive anti-interference process consumes a long time, and the anti-interference module is complex in structure and difficult to integrate.
In summary, the conventional adaptive anti-interference scheme consumes a large amount of time, is in the millisecond level, consumes high power, has a complex structure, and cannot meet the requirements of miniaturization and integration of the mobile terminal when receiving and detecting frequency information from interference.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a self-adaptive anti-jamming circuit to solve the problem that a receiver faces dynamically-changed jamming signals; the circuit detects and tracks interference signals by using a frequency locking mechanism of a phase-locked loop, shortens the consumed time of the whole self-adaptive anti-interference scheme to a millisecond level, and solves the problems that the traditional self-adaptive anti-interference circuit is long in consumed time, complex in circuit structure, large in power consumption and difficult to realize miniaturization and integration of a mobile terminal.
The invention adopts the following technical scheme for solving the technical problems:
the utility model provides a self-adaptation anti-jamming circuit, self-adaptation anti-jamming circuit contains adjustable anti-jamming circuit and interference signal detection circuitry, and interference signal detection circuitry utilizes the frequency locking characteristic of phase-locked loop to detect and trail the interference signal to turn into the adjustable anti-jamming circuit network of control signal control adjustable anti-jamming circuit with the testing result, realize self-adaptation anti-jamming.
Preferably, the interference signal detection circuit comprises a phase-locked loop module and a decoder module; one or both of the injection lock amplifier module and the frequency divider module may be included according to application requirements and operating frequency. The interference signal and the useful signal enter the interference signal detection circuit at the same time, the amplitude of the interference signal is usually large, and the injection locking amplifier can extract the interference signal and amplify the interference signal. The higher the interfering signal frequency, the need for a frequency divider to divide it.
Preferably, the phase-locked loop module is used for realizing frequency detection and tracking of an input reference signal of the phase-locked loop module, and the decoder module is used for generating a control signal according to a frequency information code output by the phase-locked loop module and controlling an adjustable anti-interference circuit network of the adjustable anti-interference circuit; the injection locking amplifier module is used for amplifying the interference signal; the frequency divider module is used for dividing the frequency of the input signal.
Preferably, the tunable antijam circuit comprises a receiver circuit, the receiver circuit comprises a low noise amplifier and a mixer, and the receiver circuit further comprises an analog baseband, an ADC and a baseband.
Preferably, the adjustable anti-jamming circuit comprises an adjustable anti-jamming circuit network, and the adjustable anti-jamming circuit network can be an independent module or can be integrated in a low noise amplifier or a mixer. The adjustable anti-jamming circuit network is controlled by the control signal generated by the decoder. The adjustable anti-interference circuit network can be designed according to actual requirements, and the universality is high.
Preferably, the phase-locked loop in the interference signal detection circuit may be an all-digital phase-locked loop, an under-sampling phase-locked loop, or a charge pump type phase-locked loop. The type of the phase-locked loop can be selected according to actual requirements, so that the design of the whole anti-interference circuit is more flexible.
When the interference signal detected by the self-adaptive anti-interference circuit is a non-single frequency signal, the frequency information code output by a phase-locked loop in the interference signal detection circuit changes within a certain range to realize the detection and tracking of the interference signal bandwidth, the phase-locked loop is in a state close to locking but not locked, and a decoder generates a corresponding control signal according to the difference between the maximum value and the minimum value of the frequency information code to control an adjustable anti-interference circuit network to realize the self-adaptive bandwidth adjustable anti-interference function.
A self-adaptive anti-jamming circuit comprises an interference signal detection circuit and an adjustable anti-jamming circuit, wherein the interference signal detection circuit comprises an injection locking amplifier, a frequency divider, a phase-locked loop and a decoder, and an oscillator in the phase-locked loop adopts a numerical control oscillator; the adjustable anti-interference circuit comprises an adjustable anti-interference circuit network, a low noise amplifier and a mixer; the interference signal and the useful signal enter an injection locking amplifier at the same time, and the amplifier amplifies the interference signal to realize the extraction of the interference signal; the injection locking amplifier is connected with a frequency divider, and the interference signal is sent into a phase-locked loop after being divided; the phase-locked loop locks the output signal at the frequency of the interference signal, the frequency information code of the numerical control oscillator is sent to the decoder, the decoder outputs a control signal to control the adjustable anti-interference circuit network, and the adjustable anti-interference circuit carries out self-adaptive adjustment along with the change of the interference signal.
Compared with the prior art, the invention has the following technical effects:
1) the self-adaptive anti-interference circuit can shorten the time consumption of the whole self-adaptive anti-interference scheme to a microsecond level, and solves the problem of long time consumption of the traditional self-adaptive anti-interference scheme;
2) the adaptive anti-interference circuit solves the problems that the traditional adaptive anti-interference scheme needs complete analog baseband and ADC, has complex structure and large power consumption, and is difficult to realize miniaturization and integration of the mobile terminal;
3) the self-adaptive anti-interference circuit can be widely applied to scenes with dynamic changes of interference signals such as mobile communication, radars and the like, realizes self-adaptive anti-interference of a receiver, and has novelty and universality.
Drawings
Fig. 1 is a block diagram of an adaptive anti-jamming circuit according to the present invention.
Fig. 2 is a specific block diagram of an adaptive anti-jamming circuit according to the present invention.
Fig. 3 is a schematic diagram of an embodiment of an adaptive immunity circuit of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example 1: the invention discloses a self-adaptive anti-interference circuit which comprises an adjustable anti-interference circuit and an interference signal detection circuit. The interference signal detection circuit detects and tracks the interference signal by using the frequency locking characteristic of the phase-locked loop, and converts the detection result into a control signal to control an adjustable anti-interference network of the adjustable anti-interference circuit, so that self-adaptive anti-interference is realized. The time consumption of the self-adaptive anti-interference scheme is shortened to a microsecond level, and the self-adaptive anti-interference scheme has good practical application value.
As shown in fig. 1 and fig. 2, the adaptive anti-jamming circuit according to the embodiment of the present invention includes an adjustable anti-jamming circuit and a jamming signal detection circuit. The interference signal detection circuit comprises a phase-locked loop module and a decoder module; one or both of the injection lock amplifier module and the frequency divider module may be included according to application requirements and operating frequency.
The decoder module is used for generating a control signal according to a frequency information code output by the phase-locked loop and controlling an adjustable anti-interference circuit network of the adjustable anti-interference circuit; the injection locking amplifier module is used for amplifying the interference signal; the frequency divider module is used for dividing the frequency of the input signal. The phase-locked loop in the interference detection circuit may be an all-digital phase-locked loop, an under-sampled phase-locked loop, or a charge-pump type phase-locked loop. The adjustable anti-jamming circuit comprises a receiver circuit, the receiver circuit comprises a low noise amplifier and a mixer, and the receiver circuit can further comprise an analog baseband, an ADC and a baseband. The adjustable anti-jamming circuit comprises an adjustable anti-jamming circuit network, wherein the adjustable anti-jamming circuit network can be an independent module and can also be integrated in a low noise amplifier or a mixer. The adjustable anti-jamming circuit network is controlled by the control signal generated by the decoder.
Example 2: the self-adaptive anti-interference circuit can be applied to different scenes by reasonably designing the interference signal detection circuit and the adjustable anti-interference circuit network, thereby realizing self-adaptive anti-interference. As shown in fig. 3, an adaptive anti-jamming circuit according to an embodiment of the present invention is disclosed, wherein the jamming signal detecting circuit includes an injection locking amplifier, a frequency divider, a phase-locked loop, and a decoder; the adjustable anti-jamming circuit comprises an anti-jamming circuit network, a low noise amplifier and a frequency mixer. The interference signal and the useful signal enter the injection locking amplifier at the same time, and the amplifier amplifies the interference signal to realize the extraction of the interference signal. Because the frequency of the interference signal is higher, the frequency divider is connected behind the injection lock-in amplifier, and the interference signal is sent into the phase-locked loop after being divided. The oscillator in the phase-locked loop adopts a digital control oscillator, the phase-locked loop locks the output at the frequency of the interference signal, the frequency information code of the digital control oscillator can be directly sent to the decoder, the decoder outputs a control signal to control the adjustable anti-interference circuit network, and the adjustable anti-interference circuit realizes the self-adaptive adjustment along with the change of the interference signal.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (9)
1. The utility model provides an adaptive anti-jamming circuit, its characterized in that contains adjustable anti-jamming circuit and interfering signal detection circuitry, interfering signal detection circuitry utilizes the frequency locking characteristic of phase-locked loop to detect and track interfering signal to turn into the adjustable anti-jamming circuit network of control signal control adjustable anti-jamming circuit with the testing result, realize self-adaptation anti-jamming.
2. The adaptive jammer rejection circuit according to claim 1, wherein said jammer detection circuit comprises a phase locked loop module and a decoder module.
3. The adaptive jammer rejection circuit of claim 2, wherein said jammer detection circuit further comprises one or both of an injection locked amplifier module, a frequency divider module.
4. An adaptive anti-jamming circuit according to claim 2 or 3, wherein the phase-locked loop module is configured to perform frequency detection and tracking on an input reference signal thereof and output a frequency information code, and the decoder module is configured to generate a control signal according to the frequency information code output by the phase-locked loop to control the adjustable anti-jamming circuit network of the adjustable anti-jamming circuit; the injection locking amplifier module is used for amplifying the interference signal; the frequency divider module is used for dividing the frequency of the input signal.
5. An adaptive jammer rejection circuit according to claim 1, wherein said adjustable jammer rejection circuit comprises a receiver circuit comprising a low noise amplifier and a mixer, the receiver circuit further comprising an analog baseband, an ADC and a baseband.
6. An adaptive jammer rejection circuit according to claim 1, wherein said adjustable jammer rejection circuit comprises an adjustable jammer rejection circuit network, said adjustable jammer rejection circuit network being provided as a separate module or integrated in a low noise amplifier or mixer, said adjustable jammer rejection circuit network being controlled by a control signal generated by said decoder.
7. An adaptive jammer rejection circuit according to any one of claims 2-3, wherein the phase locked loop module of the jammer detection circuit is configured as one of an all-digital phase locked loop, an under-sampled phase locked loop, or a charge-pump type phase locked loop.
8. An adaptive anti-jamming circuit according to any one of claims 1 to 7, wherein when the adaptive anti-jamming circuit faces a non-single frequency signal, a frequency information code output by a phase-locked loop in the interference signal detection circuit changes within a certain range, thereby completing detection and tracking of an interference signal bandwidth and realizing an adaptive bandwidth-adjustable anti-jamming function.
9. An adaptive immunity against interference circuit according to any one of claims 1 to 8, wherein the interference signal detection circuit includes an injection locked amplifier, a frequency divider, a phase locked loop and a decoder, an oscillator in the phase locked loop being a digitally controlled oscillator; the adjustable anti-interference circuit comprises an adjustable anti-interference circuit network, a low noise amplifier and a mixer; the interference signal and the useful signal enter an injection locking amplifier at the same time, and the amplifier amplifies the interference signal to realize the extraction of the interference signal; the injection locking amplifier is connected with a frequency divider, and the interference signal is sent into a phase-locked loop after being divided; the phase-locked loop locks the output signal at the frequency of the interference signal, the frequency information code of the numerical control oscillator is sent to the decoder, the decoder outputs a control signal to control the adjustable anti-interference circuit network, and the adjustable anti-interference circuit realizes self-adaptive adjustment along with the change of the interference signal.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100265116A1 (en) * | 2007-10-10 | 2010-10-21 | Wolfdietrich Georg Kasperkovitz | Anti jamming system |
| CN201708787U (en) * | 2010-03-31 | 2011-01-12 | 上海集成电路研发中心有限公司 | Process variation self-adaptive phase lock loop frequency synthesizer |
| CN106134518B (en) * | 2009-12-08 | 2013-06-19 | 北京遥测技术研究所 | A kind of Receiver of Direct-sequence Spread Spectrum Suppression of narrow band interference apparatus and method |
| CN111045035A (en) * | 2019-12-19 | 2020-04-21 | 泰斗微电子科技有限公司 | Navigation signal anti-interference method, device and system |
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2020
- 2020-08-26 CN CN202010873531.7A patent/CN111988033B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100265116A1 (en) * | 2007-10-10 | 2010-10-21 | Wolfdietrich Georg Kasperkovitz | Anti jamming system |
| CN106134518B (en) * | 2009-12-08 | 2013-06-19 | 北京遥测技术研究所 | A kind of Receiver of Direct-sequence Spread Spectrum Suppression of narrow band interference apparatus and method |
| CN201708787U (en) * | 2010-03-31 | 2011-01-12 | 上海集成电路研发中心有限公司 | Process variation self-adaptive phase lock loop frequency synthesizer |
| CN111045035A (en) * | 2019-12-19 | 2020-04-21 | 泰斗微电子科技有限公司 | Navigation signal anti-interference method, device and system |
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