CN111510193B - Non-cooperative interference suppression device for satellite ground station and control method thereof - Google Patents
Non-cooperative interference suppression device for satellite ground station and control method thereof Download PDFInfo
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Abstract
The invention discloses a non-cooperative interference suppression device and a non-cooperative interference suppression method for a satellite ground station. By using the independent beacon signal and data signal interference suppression unit, the interference suppression processing is synchronously performed on the beacon signal and the data signal, the sampling rate required by digitalizing the beacon signal and the data signal is reduced, and the method is suitable for satellite ground stations with large working bandwidth; the digital signals output by the interference suppression processing are converted into intermediate frequency analog signals and then output, so that the transparent forwarding of beacon signals and data signals is realized, and the interference suppression device is suitable for various communication systems.
Description
Technical Field
The invention relates to the technical field of satellite communication anti-interference, in particular to a non-cooperative interference suppression device of a satellite ground station and a control method thereof.
Background
Satellite communication ground stations typically employ parabolic antennas to achieve high antenna gain. The parabolic antenna has low side lobe gain and can suppress interference signals to a certain extent. However, in practice the side lobe gain can only be reduced to a limited level, and thus the interference rejection of the parabolic antenna is limited. Especially when the interferer is directed close to the antenna main lobe, or when the interferer is located at a side lobe but with a large power, relying on a paraboloid alone is more difficult to achieve a sufficient interference rejection ratio.
In order to improve the interference suppression capability of the satellite access ground station, one method is to use an array antenna beam forming method, i.e., to use a plurality of antenna units to achieve interference suppression by controlling the beam null so that the beam null direction is aligned with the interference signal direction.
Although there are a lot of reports in the literature on the beamforming interference suppression method, the following problems still exist when applied to a satellite communication ground station. First, interference suppression needs to be achieved for both beacon signals and data signals. Currently, in satellite communications, especially in synchronous orbit satellite communications, downlink signals include two signals, a beacon signal and a data signal, and different carrier frequencies are used. Wherein the beacon signal is used to direct the satellite. If the beacon signal or the data signal is interfered, the communication terminal may be caused, and therefore, the interference suppression processing is required to be simultaneously performed. Second, the operating bandwidth is large. Satellite communications typically operate at bandwidths of several hundred megahertz. And, since the beacon signal and the data signal are spaced apart in the frequency domain from several mhz to several hundreds mhz. According to the traditional thought, the beacon signal and the data signal need to be collected simultaneously for processing, but the sampling rate of gigahertz is needed, and the realization cost is high undoubtedly. Third, multiple communication regimes need to be adapted. Currently, satellite communication devices do not employ a unified communication standard, and multiple communication systems, such as TDMA, FDMA, etc., exist simultaneously. Therefore, communication satellites typically employ a transparent forwarding scheme to accommodate different communication regimes or protocols. Accordingly, the interference suppression process must also be transparent to the satellite-based received signals to accommodate different communication regimes.
In order to improve the anti-interference capability of a satellite ground station, the chinese patent "downlink interference suppression method for a dual-antenna satellite communication system (application number: 201210551818.3)" discloses a dual-antenna downlink interference suppression method, but this method needs to use a downlink training sequence to perform filter weight estimation, and therefore, it cannot be applied to a satellite system without a training sequence.
Disclosure of Invention
The present invention is directed to provide a non-cooperative interference suppression device for a satellite ground station and a method for using the same, which are suitable for a wide operating bandwidth, can perform interference suppression processing on a beacon signal and a data signal at the same time, and are transparent to a satellite signal.
The invention provides a non-cooperative interference suppression device of a satellite ground station, which is characterized by comprising an auxiliary array antenna, a multi-channel low-noise down frequency conversion unit, a power divider group, a beacon signal interference suppression processing unit and a data signal interference suppression processing unit; wherein
The auxiliary array antenna comprises N antenna units and is used for receiving interference signals; the output end of each antenna unit is electrically connected with the second to the (N + 1) th radio frequency input ends of the low-noise lower frequency conversion unit respectively;
the multi-channel low-noise down frequency conversion unit comprises N +1 low-noise down frequency conversion channels, wherein a first radio frequency input end is used for receiving signals received by the satellite ground station antenna, and output ends are respectively and electrically connected with input ends of the N +1 power dividers; the system is used for amplifying and down-converting satellite ground station antenna receiving signals and auxiliary array antenna receiving signals to intermediate frequency;
the power divider group comprises N +1 independent one-to-two power dividers, wherein one output end of each power divider is connected with any input end of the beacon signal interference suppression processing unit, and the other output end of each power divider is connected with any input end of the data signal interference suppression processing unit; the device is used for dividing the intermediate frequency signal into two parts which are respectively used for beacon signal interference suppression processing and data signal interference suppression processing;
the beacon signal interference suppression processing unit is used for performing beacon signal interference suppression processing and outputting a beacon signal subjected to interference suppression processing;
and the data signal interference suppression processing unit is used for data signal interference suppression processing and outputting the data signal after the interference suppression processing.
In the above technical solution, the first channel and other channels of the multi-channel low-noise down frequency conversion unit share one reference signal source, the second to nth channels share one local oscillation source, and the first channel uses one local oscillation source alone.
In the above technical solution, the beacon signal interference suppression processing unit and the data signal interference suppression processing unit each include N +1 receiving channels, a digital signal processing unit, and a transmitting channel; wherein the content of the first and second substances,
the N +1 receiving channels digitize the input analog signals, and the output ends of the receiving channels are respectively connected with the digital signal processing unit;
the digital signal processing unit realizes an interference suppression processing algorithm, and the output end of the digital signal processing unit is connected with the input end of the transmitting channel;
and the transmitting channel converts the digital signals output by the digital signal processing unit into analog signals.
In the above technical solution, the beacon signal interference suppression processing unit and the data signal interference suppression processing unit continuously forward the beacon signal and the data signal to the output end, respectively.
In the above technical solution, the multi-channel low-noise down frequency conversion unit includes N +1 low-noise down frequency conversion units, a first local oscillation source, a second local oscillation source, a first power divider, a second power divider, and a reference signal source; the input ends of the N +1 low-noise down frequency conversion units respectively receive corresponding satellite antenna receiving signals or auxiliary array antenna receiving signals and are used for down-converting the satellite antenna receiving signals or the auxiliary array antenna receiving signals to intermediate frequency; the low-noise lower frequency conversion unit comprises a low-noise lower frequency conversion unit and a lower frequency conversion unit; the input end of the low-noise amplifying unit is used as the input end of the low-noise lower frequency conversion unit, and the output end of the low-noise amplifying unit is electrically connected with the radio frequency input end of the lower frequency conversion unit; the down-conversion unit mixes the received input signal with a local oscillation signal to obtain an intermediate frequency signal;
the reference signal input end of the first local oscillation source is connected with the output end of the second power divider, and the output end of the first local oscillation source is connected with the local oscillation signal input end of the down-conversion unit of the 1 st low-noise down-conversion unit so as to provide local oscillation signals;
the reference signal input end of the second local vibration source is connected with the other output end of the second power divider, and the output end of the second local vibration source is connected with the input end of the first power divider and used for providing local vibration signals for the 2 nd to N +1 th low-noise lower frequency conversion units;
the output end of the first power divider is respectively connected with the local oscillation signal input ends of the down-conversion units in the 2 nd to N +1 th low-noise down-conversion units, and the first power divider is used for dividing the output signal of the second local oscillation source into N paths of equal power and outputting the N paths of equal power to the corresponding down-conversion units;
the input end of the second power divider is connected with the output end of the reference signal source and is used for dividing the output signal of the reference signal source into 2 paths of equal power;
the reference signal source generates a fixed-frequency single-frequency signal and is used for providing a reference signal for the first local vibration source and the second local vibration source.
In the above technical solution, in the beacon signal interference suppression processing unit, the digital signal processing unit is configured to amplify, downconvert, and convert an input signal into a digital signal; each receiving channel comprises a low-noise amplifier module, a down-conversion module and an ADC (analog-to-digital converter) module, wherein the input end of the low-noise amplifier module is connected with an input signal, and the output end of the low-noise amplifier module is connected with the input end of the down-conversion module; the output end of the down-conversion module is connected with the input end of the ADC module;
the digital signal processing unit is realized by adopting an FPGA chip, and the input end of the digital signal processing unit is electrically connected with the output end of each ADC module;
the transmitting channel comprises a DAC module, an up-conversion module and a band-pass filtering module, wherein the input end of the DAC module is connected with the output end of the digital signal processing unit, and the output end of the DAC module is connected with the input end of the up-conversion module; the output end of the up-conversion module is connected with the input end of the band-pass filtering module; the band-pass filtering module outputs an intermediate frequency signal;
the beacon signal interference suppression processing unit further comprises a local oscillation source module, which is used for providing local oscillation signals for the down-conversion module and the up-conversion module in each receiving channel.
In the above technical solution, the data signal interference suppression processing unit and the beacon signal processing unit adopt the same circuit structure, and the local oscillation source module outputs the corresponding data signal frequency.
The invention provides a control method of a non-cooperative interference suppression device of a satellite ground station, which is characterized by comprising the following steps:
s1, enabling an interference reference signal received by an auxiliary array antenna to pass through a space-time or space-frequency filter to obtain an interference cancellation signal;
s2, synthesizing the obtained interference cancellation signal with a satellite antenna receiving signal through the device to realize interference suppression processing;
and S3, inputting the interference reference signal and the obtained interference suppression output signal to a self-adaptive filtering algorithm, and iteratively updating the weight value of the space-time filter to realize self-adaptive beam forming control.
The invention uses the independent beacon signal and data signal interference suppression unit, can synchronously carry out interference suppression processing on the beacon signal and the data signal, and reduces the sampling rate required by digitalizing the beacon signal and the data signal, thereby solving the problem that the sampling rate required by simultaneously acquiring the beacon signal and the data signal is too high or even cannot be realized, and being applicable to large working bandwidth. The beacon signal interference suppression processing unit and the data signal interference suppression processing unit can continuously convert the digital signals subjected to interference suppression processing into intermediate-frequency analog signals for output, and can realize transparent forwarding of beacon signals and data signals, so that the interference suppression device can be applicable to various communication systems.
Drawings
FIG. 1 is a block diagram of an embodiment of a non-cooperative interference suppression apparatus for satellite ground station interference according to the present invention
FIG. 2 is a block diagram of a bypass unit according to an embodiment of the present invention
FIG. 3 is a block diagram of a beacon signal interference suppression processing unit according to an embodiment of the present invention
FIG. 4 is a block diagram of a non-cooperative interference suppression algorithm for satellite earth station interference 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.
In the embodiment, the adopted satellite ground station antenna is a parabolic antenna; the beacon signal interference suppression processing unit outputs a signal receiving beacon machine; the output of the data signal interference suppression processing unit is connected with a satellite communication modem.
Fig. 1 is a block diagram of an embodiment of the present invention, which includes an auxiliary array antenna 101, a multi-channel low-noise down converter unit 102, a power divider group 103, a beacon signal interference suppression processing unit 104, and a data signal interference suppression processing unit 105; wherein
The auxiliary array antenna 101 comprises N antenna units, the output end of each antenna unit is respectively connected with the second to the (N + 1) th input ends of the low-noise lower frequency conversion unit, and each antenna unit is a semi-omnidirectional antenna and is used for receiving interference signals;
the multi-channel low-noise down frequency conversion unit 102 comprises N +1 low-noise down frequency conversion channels, wherein a first radio frequency input end is connected with a satellite ground station antenna receiving signal, and output ends are respectively connected with input ends of N +1 power dividers; the antenna array is used for amplifying and down-converting the satellite earth station antenna receiving signals and the auxiliary array antenna receiving signals to intermediate frequency.
The power divider group 103 includes N +1 one-to-two power dividers 1031, where one output end of each power divider is connected to any input end of the beacon signal interference suppression processing unit, and the other output end is connected to any input end of the data signal interference suppression processing unit, and is configured to divide the intermediate frequency signal into two parts, which are used for beacon signal interference suppression processing and data signal interference suppression processing, respectively;
the beacon signal interference suppression processing unit 104 is configured to implement beacon signal interference suppression processing and output a beacon signal after the interference suppression processing;
the data signal interference suppression processing unit 105 is configured to implement data signal interference suppression processing and output a data signal after the interference suppression processing.
Fig. 2 is a block diagram of an embodiment of the multi-channel low-noise down converter 102, which includes N +1 low-noise down converters 201, a first local oscillator 202, a second local oscillator 206, a first power divider 203, a second power divider 204, and a reference signal source 205; wherein
The input end of the low-noise down-conversion unit 201 is connected to the satellite antenna receiving signal or the auxiliary array antenna 101 receiving signal, and is used for down-converting the satellite antenna receiving signal or the auxiliary array antenna 101 receiving signal to an intermediate frequency. In this embodiment, the low-noise down converter 201 includes a low-noise down converter 2011 and a down converter 2012; the output of the low-noise amplifier 2011 is connected with the radio frequency input end of the down-conversion unit; the down-conversion unit 2012 mixes the input signal with the local oscillation signal to obtain an intermediate frequency signal;
the reference signal input end of the first local oscillation source 202 is connected to an output end of the second power divider 204, and the output end of the first local oscillation source is connected to the local oscillation signal input end of the 1 st channel down-conversion unit 2012, and is configured to provide a local oscillation signal for the first low-noise down-conversion unit;
the reference signal input end of the second local oscillation source 206 is connected to the other output end of the second power divider 204, and the output end of the second local oscillation source is connected to the input end of the first power divider 203, and is configured to provide local oscillation signals for the 2 nd to N +1 th low-noise lower frequency conversion units 201;
the output end of the first power divider 203 is connected to the local oscillator signal input end of the down conversion unit 2012 in the 2 nd to N +1 th low-noise down frequency conversion units, respectively, and is configured to divide the output signal of the second local oscillator 206 into N paths with equal power. In this embodiment, the first power divider 203 employs N paths of equal power dividers.
The input end of the second power divider 204 is connected to the output end of the reference signal source 205, and is configured to divide the signal output by the reference signal source 205 into 2 paths of equal power;
the reference signal source 205 generates a single frequency signal with a fixed frequency, and is configured to provide a reference signal for the first local oscillator and the second local oscillator.
Fig. 3 is a block diagram of an embodiment of the beacon signal interference suppression processing unit 104, which includes N +1 receiving channels 301, a digital signal processing unit 302, and a transmitting channel 303, and is configured to implement beacon signal interference suppression processing and output a beacon signal after the interference suppression processing; wherein
The output of the receiving channel 301 is connected with a digital signal processing unit 302; for amplifying, down-converting and converting the input signal into a digital signal. In this embodiment, each receiving channel includes a low-noise amplifier module 3011, a down-conversion unit module 3012, and an ADC module 3013, where an input of the low-noise amplifier module 3011 is connected to an input signal, and an output thereof is connected to an input of the down-conversion module 3012; the output end of the down-conversion module 3012 is connected to the input end of the ADC module 3013;
the digital signal processing unit 302 is configured to implement an interference suppression processing algorithm, and an output end of the digital signal processing unit is connected to an input end of the transmission channel. In this embodiment, the digital signal processing unit is implemented by using an FPGA chip;
the transmitting channel 303 is configured to convert the digital signal output by the digital signal processing unit 302 into an intermediate frequency analog signal. In this embodiment, the transmission channel includes a DAC module 3031, an up-conversion module 3032, and a band-pass filter module 3033, wherein the input end of the DAC module 3031 is connected to the input end of the digital signal processing unit 302, and the output end thereof is connected to the input end of the up-conversion module 3032; the output end of the up-conversion module 3032 is connected with the input end of the band-pass filtering module 3033; the band-pass filter module 3033 will output an intermediate frequency signal.
The data signal interference suppression processing unit 105 is configured to implement data signal interference suppression processing and output a data signal after the interference suppression processing. In the above technical solution, the data signal interference suppression processing unit 105 and the beacon signal processing unit 104 adopt the same circuit structure, but the local oscillation frequency of the down-conversion module is set to be the corresponding data signal frequency.
Fig. 4 is a block diagram of an embodiment of a non-cooperative interference suppression method for a satellite earth station according to the present invention, which includes the following steps:
s1, enabling an interference reference signal received by an auxiliary array antenna to pass through a space-time or space-frequency filter to obtain an interference cancellation signal; in this embodiment, the filter adopts a single-tap space-time filter structure, where the order of the time-domain filter is 1, and the weight value of the filter is represented by w (n) ═ w1(n)，…，wN(n)]TLet the auxiliary array antenna receive x (n) ═ x1(n)，…，xN(n)]TObtaining an interference cancellation signal y (n) ═ wH(n)x(n)；
S2, synthesizing the obtained interference cancellation signal and a satellite antenna receiving signal by using the device to realize interference suppression; in this embodiment, the interference suppression output signal is
e(n)＝d(n)-y(n)；
And S3, inputting the interference reference signal and the interference suppression output signal to a self-adaptive filtering algorithm, and iteratively updating the weight value of the space-time filter to realize self-adaptive beam forming control. In this embodiment, the adaptive filtering algorithm adopts an LMS (Least Mean Square) algorithm, and the weight updating method includes:
w(n)＝w(n-1)+μx(n)e*(n), where μ is the step factor.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (5)
1. A non-cooperative interference suppression device of a satellite ground station is characterized by comprising an auxiliary array antenna, a multi-channel low-noise down frequency conversion unit, a power divider group, a beacon signal interference suppression processing unit and a data signal interference suppression processing unit; wherein
The auxiliary array antenna comprises N antenna units and is used for receiving interference signals; the output end of each antenna unit is respectively and electrically connected with the second to the (N + 1) th radio frequency input ends of the multi-channel low-noise down frequency conversion unit;
the multi-channel low-noise down frequency conversion unit comprises N +1 low-noise down frequency conversion channels, wherein a first radio frequency input end is used for receiving signals received by the satellite ground station antenna, and output ends are respectively and electrically connected with input ends of the N +1 power dividers; the system is used for amplifying and down-converting satellite ground station antenna receiving signals and auxiliary array antenna receiving signals to intermediate frequency;
the power divider group comprises N +1 independent one-to-two power dividers, wherein one output end of each power divider is connected with any input end of the beacon signal interference suppression processing unit, and the other output end of each power divider is connected with any input end of the data signal interference suppression processing unit; the device is used for dividing the intermediate frequency signal into two parts which are respectively used for beacon signal interference suppression processing and data signal interference suppression processing;
the beacon signal interference suppression processing unit is used for performing beacon signal interference suppression processing and outputting a beacon signal subjected to interference suppression processing;
the data signal interference suppression processing unit is used for suppressing the data signal interference and outputting the data signal after the interference suppression processing;
the multi-channel low-noise lower frequency conversion unit comprises N +1 low-noise lower frequency conversion units, a first local vibration source, a second local vibration source, a first power divider, a second power divider and a reference signal source; the input ends of the N +1 low-noise down frequency conversion units respectively receive corresponding satellite antenna receiving signals or auxiliary array antenna receiving signals and are used for down-converting the satellite antenna receiving signals or the auxiliary array antenna receiving signals to intermediate frequency; the low-noise lower frequency conversion unit comprises a low-noise lower frequency conversion unit and a lower frequency conversion unit; the input end of the low-noise amplifying unit is used as the input end of the low-noise lower frequency conversion unit, and the output end of the low-noise amplifying unit is electrically connected with the radio frequency input end of the lower frequency conversion unit; the down-conversion unit mixes the received input signal with a local oscillation signal to obtain an intermediate frequency signal;
the reference signal input end of the first local oscillation source is connected with the output end of the second power divider, and the output end of the first local oscillation source is connected with the local oscillation signal input end of the down-conversion unit of the 1 st low-noise down-conversion unit so as to provide local oscillation signals;
the reference signal input end of the second local vibration source is connected with the other output end of the second power divider, and the output end of the second local vibration source is connected with the input end of the first power divider and used for providing local vibration signals for the 2 nd to N +1 th low-noise lower frequency conversion units;
the output end of the first power divider is respectively connected with the local oscillation signal input ends of the down-conversion units in the 2 nd to N +1 th low-noise down-conversion units, and the first power divider is used for dividing the output signal of the second local oscillation source into N paths of equal power and outputting the N paths of equal power to the corresponding down-conversion units;
the input end of the second power divider is connected with the output end of the reference signal source and is used for dividing the output signal of the reference signal source into 2 paths of equal power;
the reference signal source generates a fixed-frequency single-frequency signal and is used for providing a reference signal for the first local vibration source and the second local vibration source;
in the beacon signal interference suppression processing unit, the digital signal processing unit is used for amplifying, down-converting and converting an input signal into a digital signal; each receiving channel comprises a low-noise amplifier module, a down-conversion module and an ADC (analog-to-digital converter) module, wherein the input end of the low-noise amplifier module is connected with an input signal, and the output end of the low-noise amplifier module is connected with the input end of the down-conversion module; the output end of the down-conversion module is connected with the input end of the ADC module;
the digital signal processing unit is realized by adopting an FPGA chip, and the input end of the digital signal processing unit is electrically connected with the output end of each ADC module;
the transmitting channel comprises a DAC module, an up-conversion module and a band-pass filtering module, wherein the input end of the DAC module is connected with the output end of the digital signal processing unit, and the output end of the DAC module is connected with the input end of the up-conversion module; the output end of the up-conversion module is connected with the input end of the band-pass filtering module; the band-pass filtering module outputs an intermediate frequency signal;
the beacon signal interference suppression processing unit also comprises a local oscillation source module which is used for providing local oscillation signals for the down-conversion module and the up-conversion module in each receiving channel;
the data signal interference suppression processing unit and the beacon signal processing unit adopt the same circuit structure, and the local vibration source module outputs corresponding data signal frequency.
2. The apparatus of claim 1, wherein the first channel of the multi-channel low-noise down converter shares a reference signal source with other channels, the second to nth channels share a local oscillator, and the first channel uses a local oscillator alone.
3. The non-cooperative interference suppression apparatus for a satellite earth station according to claim 1, wherein the beacon signal interference suppression processing unit and the data signal interference suppression processing unit respectively include N +1 reception channels, a digital signal processing unit, and a transmission channel; wherein the content of the first and second substances,
the N +1 receiving channels are used for digitizing input analog signals, and the output ends of the receiving channels are respectively connected with the digital signal processing unit;
the digital signal processing unit is used for realizing an interference suppression processing algorithm, and the output end of the digital signal processing unit is connected with the input end of the transmitting channel;
and the transmitting channel is used for converting the digital signal output by the digital signal processing unit into an analog signal.
4. The non-cooperative interference suppression apparatus for a satellite earth station according to claim 3, wherein said beacon signal interference suppression processing unit and said data signal interference suppression processing unit continuously forward the beacon signal and the data signal to the output terminal, respectively.
5. The method for controlling a non-cooperative interference suppression apparatus for a satellite earth station according to claim 1, comprising the steps of:
s1, enabling an interference reference signal received by an auxiliary array antenna to pass through a space-time or space-frequency filter to obtain an interference cancellation signal;
s2, synthesizing the obtained interference cancellation signal with a satellite antenna receiving signal through the device to realize interference suppression processing;
and S3, inputting the interference reference signal and the obtained interference suppression output signal to a self-adaptive filtering algorithm, and iteratively updating the weight value of the space-time filter to realize self-adaptive beam forming control.
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| CN113438005B (en) * | 2021-08-27 | 2022-01-04 | 中国人民解放军海军工程大学 | Satellite communication ground station interference protection device and method |
| CN113630148B (en) * | 2021-08-31 | 2022-10-28 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Uplink and downlink common-frequency spaceflight ground measurement and control station |
| CN113824491B (en) * | 2021-11-22 | 2022-01-21 | 中国人民解放军海军工程大学 | Ku/Ka dual-band satellite-communication ground station-oriented multi-frequency-point interference sampling circuit and method |
| CN113922867B (en) * | 2021-12-13 | 2022-02-22 | 中国人民解放军海军工程大学 | Non-cooperative interference cancellation device and method for partial frequency band protection |
| CN116155667B (en) * | 2023-04-19 | 2023-06-27 | 深圳华龙讯达信息技术股份有限公司 | Anti-interference signal transmission processing system |
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| GB0820902D0 (en) * | 2008-11-14 | 2008-12-24 | Astrium Ltd | Active interference suppression in a satellite communication system |
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| CN103067066B (en) * | 2012-12-18 | 2015-03-11 | 哈尔滨工业大学 | Interference rejection method for down-chain of double-antenna satellite communication system |
| CN103116170B (en) * | 2013-01-16 | 2013-12-18 | 武汉大学 | Indoor testing system of antenna array based interference rejection module of global navigation satellite system (GNSS) |
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| US9742522B2 (en) * | 2013-10-14 | 2017-08-22 | Lockheed Martin Corporation | Jammer suppression for broadcast satellite system services |
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| CN107645299B (en) * | 2017-09-19 | 2019-10-22 | 中国人民解放军海军工程大学 | Adaptation control circuit and control method for adaptive interference cancellation device |
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