A method for anti-interference of liquid crystal phased array antenna signal

Abstract

The invention discloses an anti-interference method for a liquid crystal phased array antenna signal, which relates to the technical field of wireless communication and comprises the following steps: firstly, the working state of the liquid crystal phased array antenna is continuously monitored to identify the interference signal, then the arrival direction and source of the interference signal are estimated according to the identified interference signal, then the influence of the interference signal is offset by the beamforming technology to ensure the normal reception of the useful signal, and finally the useful signal is further processed by filtering, denoising and demodulating to realize the final signal anti-interference processing; the whole anti-interference processing flow of the invention is simple and clear, can timely and effectively identify the interference signal and locate the interference direction and interference source, can cope with diverse interference sources, is convenient to adapt to the dynamically changing electromagnetic environment and flexible interference forms, has strong real-time performance, can adjust the radiation mode of the liquid crystal phased array antenna array in real time, thereby significantly improving the anti-interference ability of the liquid crystal phased array antenna signal.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to an anti-interference method for liquid crystal phased array antenna signals. Background Art

[0002] In recent years, the progress of high-performance electromagnetic liquid crystal material technology has provided an effective solution for the design of low-cost, low-power phased array antennas. As a revolutionary technological innovation, liquid crystal phased array antenna technology has become the focus of research and development for many manufacturers. Liquid crystal phased array antenna is an antenna that uses the dielectric anisotropy of liquid crystal to provide deflection voltage to the upper and lower sides of the liquid crystal layer through transmission lines, and controls the deflection direction of the liquid crystal to change the phase shift of the phase shifter, thereby adjusting the alignment direction of the phased array antenna.

[0003] With the development of communication technology, there are more and more types of antennas. In the actual application of liquid crystal phased array antennas, the signals of liquid crystal phased array antennas are faced with the existence of interference sources. The interference signals will reduce the performance and reliability of the antennas, so corresponding signal anti-interference technology is needed to effectively suppress the interference signals.

[0004] Most of the existing anti-interference technologies for liquid crystal phased array antenna signals have a single means, and generally only simple filtering processing is used to perform anti-interference on signals. It is unable to timely and effectively identify interference signals and locate interference directions and sources, resulting in an inability to cope with diverse interference sources, and it is difficult to adapt to dynamically changing electromagnetic environments and flexible and changeable interference forms. The real-time performance is not strong, and the radiation pattern of the liquid crystal phased array antenna array cannot be adjusted in real time, resulting in the inability to significantly improve the anti-interference ability of the liquid crystal phased array antenna signal, and the reliability of wireless communication and the integrity of data cannot be guaranteed, which is not convenient for wide promotion and application. Therefore, the present invention proposes an anti-interference method for liquid crystal phased array antenna signals to solve the problems existing in the prior art. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to propose an anti-interference method for liquid crystal phased array antenna signals to solve the problem that the existing anti-interference technology of liquid crystal phased array antenna signals cannot timely and effectively identify interference signals and locate interference directions and interference sources, resulting in the inability to cope with diverse interference sources, difficulty in adapting to dynamically changing electromagnetic environments and flexible and changeable interference forms, as well as poor real-time performance and inability to adjust the radiation pattern of the liquid crystal phased array antenna array in real time, thereby failing to significantly improve the anti-interference ability of liquid crystal phased array antenna signals.

[0006] In order to achieve the purpose of the present invention, the present invention is implemented by the following technical scheme: a method for anti-interference of liquid crystal phased array antenna signals, comprising the following steps:

[0007] Step 1: Use signal acquisition equipment to continuously monitor the working status of the liquid crystal phased array antenna, obtain the strength, phase value and frequency parameters of the liquid crystal phased array antenna signal, and then use the signal detection algorithm to process and analyze the obtained parameters to identify the interference signal;

[0008] Step 2: After the interference signal is identified, the original data of the interference signal is collected by the interference monitoring equipment, and then the original signal is extracted from the antenna channel of the liquid crystal phased array antenna, and the arrival direction and source of the interference signal are estimated;

[0009] Step 3: According to the arrival direction and source of the interference signal estimated in step 2, a beamforming algorithm is used to adjust the phase and amplitude of each unit in the liquid crystal phased array antenna array, and a beam null point is formed in the direction of the interference signal to offset the influence of the interference signal, and then the space diversity technology is used to receive the useful signal normally;

[0010] Step 4: First, use the multi-beam technology to segment the useful signal received by the liquid crystal phased array antenna, and then use the digital signal processing technology to process the segmented useful signal including filtering, denoising and demodulation to achieve anti-interference processing of the liquid crystal phased array antenna signal.

[0011] A further improvement is that in step 1, the signal acquisition device is an oscilloscope with spectrum analysis function, and during monitoring, the oscilloscope is turned on to monitor the output signal of the liquid crystal phased array antenna, and the acquired output signal is analyzed using the spectrum analysis mode.

[0012] A further improvement is that in step 1, the signal acquisition device is a spectrum analyzer, and during monitoring, the spectrum analyzer is turned on to perform spectrum scanning on the working environment of the liquid crystal phased array antenna.

[0013] A further improvement is that in step one, the specific steps of processing and analyzing the acquired parameters using the signal detection algorithm are as follows: first, a threshold of the autocorrelation function is set according to the characteristics of the liquid crystal phased array antenna signal, the noise level and the preset interference pattern, and then the acquired parameters are compared with the preset interference pattern. If the matching degree between the parameter characteristics and the preset interference pattern exceeds the set threshold, it is determined that an interference signal is identified.

[0014] Further improvement lies in: in the step 2, the specific steps of estimating the arrival direction and source of the interference signal are: utilizing the characteristics of the original signal, combining the collective layout of the liquid crystal phased array antenna array, and comparing and analyzing the phase with the original data of the interference signal, estimating the arrival direction of the interference signal through mathematical operations, and then using triangulation to locate and measure the source of the interference signal, that is, the interference source.

[0015] A further improvement is that in step three, the corresponding radiation pattern is synthesized by adjusting the phase and amplitude of each unit in the liquid crystal phased array antenna array, and then the radiation pattern of the liquid crystal phased array antenna array is adjusted according to the synthesized radiation pattern to form a beam null point in the direction of the interference signal.

[0016] A further improvement is that in step three, the specific steps of using spatial diversity technology to normally receive useful signals are: when the liquid crystal phased array antenna array receives useful signals, a number of independent receiving antennas are added to the liquid crystal phased array antenna to receive the signals, and when there is signal interference, it automatically switches to the optimal independent receiving antenna to improve the signal-to-noise ratio.

[0017] A further improvement is that in step 4, the specific steps of segmenting the useful signal are: using multi-beam technology to segment the useful signal into several independent channels, and each channel independently processes the signal of a beam.

[0018] A further improvement is that in step 4, the specific steps of processing the useful signal including filtering, denoising and demodulating are as follows: first normalizing the useful signal, then filtering the normalized useful signal using a bandpass filter or a bandstop filter, then denoising the useful signal using wavelet transform denoising technology, and then demodulating the useful signal using phase demodulation technology.

[0019] The beneficial effects of the present invention are as follows: the present invention firstly continuously monitors the working state of the liquid crystal phased array antenna to identify the interference signal, then estimates the arrival direction and source of the interference signal according to the identified interference signal, and then adopts beamforming technology to offset the influence of the interference signal to ensure the normal reception of the useful signal, and finally further processes the useful signal through filtering, denoising and demodulation to achieve the final signal anti-interference processing. The whole processing flow is simple and clear, easy to operate, can timely and effectively identify the interference signal and locate the interference direction and interference source, can cope with diverse interference sources, is convenient to adapt to the dynamically changing electromagnetic environment and flexible interference forms, has strong real-time performance, can adjust the radiation pattern of the liquid crystal phased array antenna array in real time, thereby significantly improving the anti-interference ability of the liquid crystal phased array antenna signal, can ensure the reliability of wireless communication and the integrity of data, and is worthy of wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic flow chart of the anti-interference method of the liquid crystal phased array antenna signal of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1

[0024] See also Figure 1 This embodiment provides an anti-interference method for liquid crystal phased array antenna signals, comprising the following steps:

[0025] Step 1: Use an oscilloscope with spectrum analysis function to continuously monitor the working status of the liquid crystal phased array antenna. During monitoring, turn on the oscilloscope to monitor the output signal of the liquid crystal phased array antenna, and use the spectrum analysis mode to analyze the obtained output signal to obtain the strength, phase value and frequency parameters of the liquid crystal phased array antenna signal. Then use the signal detection algorithm to process and analyze the obtained parameters to identify the interference signal. The specific steps are: first set a threshold of the autocorrelation function according to the characteristics of the liquid crystal phased array antenna signal, the noise level and the preset interference pattern, and then compare the obtained parameters with the preset interference pattern. If the matching degree between the parameter characteristics and the preset interference pattern exceeds the set threshold, it is determined that the interference signal is identified;

[0026] Step 2: After the interference signal is identified, the original data of the interference signal is collected by interference monitoring equipment, and then the original signal is extracted from the antenna channel of the liquid crystal phased array antenna. The characteristics of the original signal are used, combined with the collective layout of the liquid crystal phased array antenna array, and the phase is compared and analyzed with the original data of the interference signal. The arrival direction of the interference signal is estimated through mathematical operations, and then the triangulation method is used to locate and measure the source of the interference signal, that is, the interference source;

[0027] Step 3: According to the arrival direction and source of the interference signal estimated in step 2, a beamforming algorithm is used to adjust the phase and amplitude of each unit in the liquid crystal phased array antenna array. The corresponding radiation pattern is synthesized by adjusting the phase and amplitude of each unit in the liquid crystal phased array antenna array. Then, the radiation pattern of the liquid crystal phased array antenna array is adjusted according to the synthesized radiation pattern to form a beam null point in the direction of the interference signal to offset the influence of the interference signal. Then, the space diversity technology is used to receive the useful signal normally. When the liquid crystal phased array antenna array receives the useful signal, a number of independent receiving antennas are added to the liquid crystal phased array antenna to receive the signal (the specific number of independent receiving antennas is selected according to actual needs). When there is signal interference, it automatically switches to the optimal independent receiving antenna to improve the signal-to-noise ratio. When a strong interference signal is detected in a certain direction, the antenna can quickly adjust the beam direction to avoid the interference source.

[0028] Step 4: First, use multi-beam technology to divide the useful signal into several independent channels. Each channel independently processes the signal of a beam to realize the segmentation of the useful signal. Even if a beam is interfered with, the signals of other beams can still be transmitted normally. Then, normalize the useful signal, and then use a bandpass filter to filter the normalized useful signal. Then, use wavelet transform denoising technology to denoise the useful signal, and then use phase demodulation technology to demodulate the useful signal to realize anti-interference processing of liquid crystal phased array antenna signals.

[0029] Embodiment 2

[0030] See also Figure 1 This embodiment provides an anti-interference method for liquid crystal phased array antenna signals, comprising the following steps:

[0031] Step 1: Use a spectrum analyzer to continuously monitor the working status of the liquid crystal phased array antenna. During monitoring, turn on the spectrum analyzer to perform spectrum scanning on the working environment of the liquid crystal phased array antenna to obtain the strength, phase value and frequency parameters of the liquid crystal phased array antenna signal. Then use the signal detection algorithm to process and analyze the obtained parameters to identify the interference signal. The specific steps are: first, set a threshold of the autocorrelation function according to the characteristics of the liquid crystal phased array antenna signal, the noise level and the preset interference pattern, and then compare the obtained parameters with the preset interference pattern. If the matching degree between the parameter characteristics and the preset interference pattern exceeds the set threshold, it is determined that the interference signal is identified;

[0032] Step 2: After the interference signal is identified, the original data of the interference signal is collected by interference monitoring equipment, and then the original signal is extracted from the antenna channel of the liquid crystal phased array antenna. The characteristics of the original signal are used, combined with the collective layout of the liquid crystal phased array antenna array, and the phase is compared and analyzed with the original data of the interference signal. The arrival direction of the interference signal is estimated through mathematical operations, and then the triangulation method is used to locate and measure the source of the interference signal, that is, the interference source;

[0033] Step 3: According to the arrival direction and source of the interference signal estimated in step 2, a beamforming algorithm is used to adjust the phase and amplitude of each unit in the liquid crystal phased array antenna array, and the corresponding radiation pattern is synthesized by adjusting the phase and amplitude of each unit in the liquid crystal phased array antenna array. Then, the radiation pattern of the liquid crystal phased array antenna array is adjusted according to the synthesized radiation pattern to form a beam null point in the direction of the interference signal to offset the influence of the interference signal, and then the space diversity technology is used to normally receive the useful signal. When the liquid crystal phased array antenna array receives the useful signal, a number of independent receiving antennas are added to the liquid crystal phased array antenna to receive the signal (the specific number of independent receiving antennas is selected according to actual needs). When there is signal interference, it automatically switches to the optimal independent receiving antenna to improve the signal-to-noise ratio. When a strong interference signal is detected in a certain direction, the antenna can quickly adjust the beam direction to avoid the interference source;

[0034] Step 4: First, use multi-beam technology to divide the useful signal into several independent channels. Each channel independently processes the signal of a beam to realize the segmentation of the useful signal. Even if a beam is interfered with, the signals of other beams can still be transmitted normally. Then, the useful signal is normalized, and then a band-stop filter is used to filter the normalized useful signal. Then, wavelet transform denoising technology is used to denoise the useful signal, and then phase demodulation technology is used to demodulate the useful signal to realize anti-interference processing of liquid crystal phased array antenna signals.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for anti-interference of liquid crystal phased array antenna signals, characterized in that: The following steps are involved: Step 1: Use a signal acquisition device to continuously monitor the working state of the liquid crystal phased array antenna, obtain the strength, phase value and frequency parameters of the liquid crystal phased array antenna signal, and then use the signal detection algorithm to process and analyze the obtained parameters to identify the interference signal. The specific steps of using the signal detection algorithm to process and analyze the obtained parameters are: first, set a threshold of an autocorrelation function according to the characteristics of the liquid crystal phased array antenna signal, the noise level and the preset interference pattern, and then compare the obtained parameters with the preset interference pattern. If the matching degree between the parameter characteristics and the preset interference pattern exceeds the set threshold, it is determined that the interference signal is identified; Step 2: After the interference signal is identified, the original data of the interference signal is collected by the interference monitoring equipment, and then the original signal is extracted from the antenna channel of the liquid crystal phased array antenna, and the arrival direction and source of the interference signal are estimated; Step 3: According to the arrival direction and source of the interference signal estimated in step 2, a beamforming algorithm is used to adjust the phase and amplitude of each unit in the liquid crystal phased array antenna array, and a beam null point is formed in the direction of the interference signal to offset the influence of the interference signal, and then the space diversity technology is used to receive the useful signal normally; Step 4: First, use the multi-beam technology to segment the useful signal received by the liquid crystal phased array antenna, and then use the digital signal processing technology to process the segmented useful signal including filtering, denoising and demodulation to achieve anti-interference processing of the liquid crystal phased array antenna signal.

2. The anti-interference method of a liquid crystal phased array antenna signal according to claim 1, characterized in that: In the step 1, the signal acquisition device is an oscilloscope with a spectrum analysis function. During monitoring, the oscilloscope is turned on to monitor the output signal of the liquid crystal phased array antenna, and the acquired output signal is analyzed using a spectrum analysis mode.

3. The anti-interference method of a liquid crystal phased array antenna signal according to claim 1, characterized in that: In the step 1, the signal acquisition device is a spectrum analyzer, and during monitoring, the spectrum analyzer is turned on to perform spectrum scanning on the working environment of the liquid crystal phased array antenna.

4. The anti-interference method of a liquid crystal phased array antenna signal according to claim 1, characterized in that: In the step 2, the specific steps for estimating the arrival direction and source of the interference signal are: utilizing the characteristics of the original signal, combining the collective layout of the liquid crystal phased array antenna array, and performing phase comparison and analysis with the original data of the interference signal, estimating the arrival direction of the interference signal through mathematical operations, and then using triangulation to locate and measure the source of the interference signal, that is, the interference source.

5. The anti-interference method of a liquid crystal phased array antenna signal according to claim 1, characterized in that: In the step three, the corresponding radiation pattern is synthesized by adjusting the phase and amplitude of each unit in the liquid crystal phased array antenna array, and then the radiation pattern of the liquid crystal phased array antenna array is adjusted according to the synthesized radiation pattern to form a beam null point in the direction of the interference signal.

6. The anti-interference method of a liquid crystal phased array antenna signal according to claim 1, characterized in that: In the step three, the specific steps of using spatial diversity technology to normally receive useful signals are as follows: when the liquid crystal phased array antenna array receives useful signals, a number of independent receiving antennas are added to the liquid crystal phased array antenna to receive the signals, and when there is signal interference, the signals are automatically switched to the optimal independent receiving antenna to improve the signal-to-noise ratio.

7. The anti-interference method of a liquid crystal phased array antenna signal according to claim 1, characterized in that: In the step 4, the specific steps of segmenting the useful signal are: using the multi-beam technology to segment the useful signal into a number of independent channels, and each channel independently processes the signal of a beam.

8. The anti-interference method for liquid crystal phased array antenna signals according to claim 1, characterized in that: In the step 4, the specific steps of processing the useful signal including filtering, denoising and demodulating are: first normalizing the useful signal, then filtering the normalized useful signal using a bandpass filter or a bandstop filter, then denoising the useful signal using a wavelet transform denoising technique, and then demodulating the useful signal using a phase demodulation technique.

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