Communication anti-interference antenna and navigation equipment

Abstract

The invention discloses a communication anti-interference antenna and navigation equipment. The communication anti-interference antenna comprises an antenna array, a radio frequency channel module, an anti-interference processing module and a multiplexer module, and the antenna array is used for receiving an initial radio frequency signal of a communication satellite; the radio frequency channel module is used for converting a part of signals of a specified frequency band in the initial radio frequency signals into initial intermediate frequency signals and converting target intermediate frequency signals into target radio frequency signals; the anti-interference processing module is used for performing anti-interference processing on the initial intermediate frequency signal according to a space-time adaptive signal processing strategy to obtain a target intermediate frequency signal; the multiplexer module is used for combining the multiple paths of target radio frequency signals in the radio frequency channel module to obtain a combined radio frequency signal; the antenna array is also configured to transmit a target radio frequency signal or a combined radio frequency signal. The technical problems of large size, poor anti-interference performance and poor robustness of a communication antenna system structure in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication anti-interference antenna and navigation equipment. Background Art

[0002] Due to space attenuation and other reasons, the signal strength of Beidou satellites is very weak when it reaches the ground, and the communication antenna system is susceptible to various forms of interference. In actual engineering applications, the antenna array module, low noise amplifier module and down-conversion module in the communication antenna system are all composed of analog discrete components, which will lead to mutual coupling errors between antenna array elements, which will cause deviations and disturbances in the antenna array flow pattern, affecting the performance of the entire communication antenna system.

[0003] In the related art, in order to improve the anti-interference capability of the communication antenna system, it is usually only necessary to improve the anti-interference capability of the receiver in the communication antenna system. The structure is large in size and the effect of improving the anti-interference capability is relatively limited. It is still susceptible to interference in a complex electromagnetic environment. The communication antenna system has poor anti-interference and robustness.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present application provide a communication anti-interference antenna and a navigation device to at least solve the technical problems in the related art that the communication antenna system structure is large in size, and the communication antenna system has poor anti-interference and poor robustness.

[0006] According to one aspect of an embodiment of the present application, a communication anti-interference antenna is provided, comprising: an antenna array, a radio frequency channel module, an anti-interference processing module and a multiplexer module, wherein the antenna array is used to receive an initial radio frequency signal from a communication satellite; the radio frequency channel module is used to convert part of the signal in a specified frequency band in the initial radio frequency signal into an initial intermediate frequency signal, and to convert the target intermediate frequency signal into a target radio frequency signal; the anti-interference processing module is used to perform anti-interference processing on the initial intermediate frequency signal according to a space-time adaptive signal processing strategy to obtain a target intermediate frequency signal, and the space-time adaptive signal processing strategy is constructed based on a normalized least mean square algorithm; the multiplexer module is used to merge and process multiple target radio frequency signals in the radio frequency channel module to obtain a merged radio frequency signal; the antenna array is also used to transmit a target radio frequency signal or a merged radio frequency signal.

[0007] In some embodiments, the antenna array is a circularly polarized antenna array, in which a microstrip antenna is used as an antenna unit, and the microstrip antenna is fed by a single feed point to achieve circular polarization.

[0008] In some embodiments, the RF channel module includes multiple RF channels, and each RF channel includes: a low noise amplifier, used to amplify the initial RF signal to obtain an amplified RF signal; a down-conversion unit, used to convert the amplified RF signal into an initial intermediate frequency signal, and send the initial intermediate frequency signal to the anti-interference processing module; an up-conversion unit, used to receive the target intermediate frequency signal sent by the anti-interference processing module, and convert part of the signal in a specified frequency band in the target intermediate frequency signal to obtain the target RF signal; a power amplifier, used to power amplify the combined RF signal sent by the multiplexer module, update the combined RF signal, and send the updated combined RF signal to the antenna array.

[0009] In some embodiments, the anti-interference processing module includes multiple intermediate frequency channels, and the multiple intermediate frequency channels correspond to multiple antenna array elements in the antenna array; each intermediate frequency channel includes: an analog-to-digital conversion unit, a signal processing unit and a digital-to-analog conversion unit, wherein the analog-to-digital conversion unit is used to convert each intermediate frequency signal in the initial intermediate frequency signal from an analog signal form to a digital signal form; the signal processing unit is used to perform adaptive filtering processing on each intermediate frequency signal in the initial intermediate frequency signal in the digital signal form to obtain each intermediate frequency signal in the target intermediate frequency signal in the digital signal form; the digital-to-analog conversion unit is used to convert each intermediate frequency signal in the target intermediate frequency signal from a digital signal form to an analog signal form.

[0010] In some embodiments, the signal processing unit is a programmable gate array chip, which determines the target intermediate frequency channel corresponding to the target antenna array element among multiple antenna array elements as a reference channel, sets the weight of the reference channel to a preset value, and the target weights of other intermediate frequency channels in the multiple intermediate frequency channels except the target intermediate frequency channel are adaptively updated in real time by the signal processing units in the other intermediate frequency channels through the power inversion criterion and the normalized least mean square algorithm.

[0011] In some embodiments, the signal processing unit in other intermediate frequency channels includes: a filter and a weight update component, wherein the filter is used to filter the input vector based on the initial weight to obtain a filtered output, and the input vector is determined by the intermediate frequency signal in the current intermediate frequency channel where the filter is located; the weight update component is used to calculate the channel error based on the filtered output and the reference signal, and use the channel error, the input vector, the power inversion criterion and the normalized least mean square algorithm to update the initial weight to obtain the target weight, and the reference signal is determined by the intermediate frequency signal in the reference channel.

[0012] In some embodiments, the adjustment step size corresponding to the normalized least mean square algorithm is determined by the power value of the input vector, and the adjustment step size is the time step size for adaptively updating the target weight.

[0013] In some embodiments, the convergence conditions of the target weights in the weight update component include: the weights of the reference channel are combined with the target weights corresponding to other intermediate frequency channels in the adaptive update, so that the total output power of the antenna array meets the minimum convergence conditions, and at the same time, the null direction in the radiation pattern of the antenna array is consistent with the direction of the interference signal.

[0014] In some embodiments, the power inversion criterion is used to ensure that the ratio of the power of the interference signal to the power of the valid signal in the filter output of the filter satisfies the minimum convergence condition during the adaptive update of the target weight.

[0015] According to another aspect of an embodiment of the present application, a navigation device is provided, which is equipped with any one of the above-mentioned communication anti-interference antennas, and the communication anti-interference antenna is used to realize the transmission of navigation data signals between the navigation device and the communication satellite.

[0016] In an embodiment of the present application, the antenna array is used to receive the initial radio frequency signal of the communication satellite; the radio frequency channel module is used to convert part of the signal of the specified frequency band in the initial radio frequency signal into an initial intermediate frequency signal, and to convert the target intermediate frequency signal into a target radio frequency signal; the anti-interference processing module is used to perform anti-interference processing on the initial intermediate frequency signal according to the space-time adaptive signal processing strategy to obtain the target intermediate frequency signal, and the space-time adaptive signal processing strategy is constructed based on the normalized least mean square algorithm; the multiplexer module is used to merge and process the multiple target radio frequency signals in the radio frequency channel module to obtain a merged radio frequency signal; the antenna array is also used to transmit the target radio frequency signal or merge the radio frequency signal. Therefore, the present application achieves the purpose of improving the anti-interference ability of the communication antenna, thereby realizing the technical effect of simplifying the structure of the communication antenna system, improving the anti-interference and robustness of the communication antenna system, and thus solving the technical problems of the large volume of the communication antenna system structure, poor anti-interference and poor robustness of the communication antenna system in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 is a schematic structural diagram of an optional anti-interference antenna for communication according to an embodiment of the present application;

[0019] Figure 2 is a schematic diagram of an optional layout of an antenna array according to an embodiment of the present application;

[0020] Figure 3 is a hardware structure block diagram of an optional anti-interference processing module according to an embodiment of the present application;

[0021] Figure 4 is a flowchart of an optional space-time adaptive signal processing strategy according to an embodiment of the present application;

[0022] Figure 5 is a model diagram of an optional normalized least mean square algorithm according to an embodiment of the present application;

[0023] Figure 6 It is a flowchart of an optional normalized least mean square algorithm according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] Under the above operating environment, the embodiment of the present application provides the following Figure 1 The structural diagram of the communication anti-interference antenna shown in FIG. Figure 1 is a structural diagram of a communication anti-interference antenna according to an embodiment of the present application, such as Figure 1As shown, the antenna includes: an antenna array, a radio frequency channel module, an anti-interference processing module and a multiplexer module, wherein the antenna array is used to receive the initial radio frequency signal of the communication satellite; the radio frequency channel module is used to convert part of the signal in the specified frequency band of the initial radio frequency signal into an initial intermediate frequency signal, and convert the target intermediate frequency signal into a target radio frequency signal; the anti-interference processing module is used to perform anti-interference processing on the initial intermediate frequency signal according to a space-time adaptive signal processing strategy to obtain a target intermediate frequency signal, and the space-time adaptive signal processing strategy is constructed based on a normalized least mean square algorithm; the multiplexer module is used to merge and process multiple target radio frequency signals in the radio frequency channel module to obtain a merged radio frequency signal; the antenna array is also used to transmit the target radio frequency signal or merge the radio frequency signal.

[0027] The above-mentioned antenna array can be composed of multiple antenna units in a specific geometric arrangement, and the antenna array can be used to improve the reception or transmission performance of the signal. The above-mentioned designated frequency band can be the frequency range in which the communication antenna receives and / or transmits signals, for example: B1 band, B3 band, S band, L band, etc. The above-mentioned space-time adaptive signal processing strategy can be a signal processing method that combines spatial information and time information. The space-time adaptive signal processing strategy can adjust the parameters of the filter according to the real-time changes of the signal environment to optimize the signal quality and signal-to-noise ratio. The space-time adaptive signal processing strategy can be used to enhance the anti-interference ability of signal reception. The above-mentioned RF channel module may include components such as a low-noise amplifier, a down-converter, an up-converter and a power amplifier. The RF channel module can be used to process the initial RF signal received by the antenna array.

[0028] Specifically, in the communication anti-interference antenna, an antenna array is used to receive the initial radio frequency signal of the communication satellite. Further, the radio frequency channel module is used to amplify the weak initial radio frequency signal of the received communication satellite, and the part of the signal in the specified frequency band of the amplified signal is converted into an initial intermediate frequency signal, and the initial intermediate frequency signal is transmitted to the anti-interference processing module. Further, the anti-interference processing module is used to perform anti-interference processing on the initial intermediate frequency signal according to the space-time adaptive signal processing strategy to obtain the target intermediate frequency signal. Further, the anti-interference processing module transmits the target intermediate frequency signal back to the radio frequency channel module, and uses the radio frequency channel module to convert the target intermediate frequency signal into a target radio frequency signal, so as to transmit the signal or combine the signal with other signals for processing. Further, the radio frequency channel module transmits multiple target radio frequency signals to the multiplexer module, and uses the multiplexer module to combine and process the multiple target radio frequency signals to obtain a combined radio frequency signal, and transmits the combined radio frequency signal.

[0029] It is easy to understand that through the above-mentioned communication anti-interference antenna, on the one hand, in the embodiment of the present application, by utilizing the antenna array, the RF channel module, the anti-interference processing module and the multiplexer module, various types of interference signals can be effectively identified and suppressed, thereby ensuring the stability and accuracy of the communication antenna in a complex electromagnetic environment; on the other hand, in the embodiment of the present application, by optimizing the design of the RF channel and introducing the multiplexer module, not only the reception and transmission quality of the communication antenna signal is improved, but also the mutual interference of signals between different channels is effectively avoided, thereby improving the signal processing efficiency and the overall performance of the communication antenna.

[0030] The above-mentioned communication anti-interference antenna in the embodiment of the present application is further introduced below.

[0031] Optionally, the antenna array is a circularly polarized antenna array, in which a microstrip antenna is used as an antenna unit, and the microstrip antenna is fed by a single feed point to achieve circular polarization.

[0032] The circularly polarized antenna array can be used to receive signals in multiple polarization directions. The microstrip antenna can be a compact, lightweight, planar antenna, which can be manufactured using printed circuit technology or microwave integration technology. The microstrip antenna can be in a variety of shapes (such as rectangular, circular, elliptical, triangular, polygonal, annular, etc.), and can include a dielectric substrate, a metal patch, and a ground plane, wherein the patch and the ground plane are isolated by a dielectric material.

[0033] It should be noted that the above antenna unit may also be a wall helical antenna.

[0034] Specifically, the antenna array adopts a circularly polarized antenna array, which can effectively reduce the signal loss caused by polarization mismatch and enhance the anti-interference ability of the communication antenna; selecting a microstrip antenna as the antenna unit of the antenna array can simplify the structure of the communication antenna and reduce the manufacturing cost of the communication antenna; further, using a single feed point feeding method, based on the cavity model theory, by introducing asymmetry in the cavity, the phase of the voltage of one mode of the degenerate mode of the two radiated orthogonal polarized waves of the antenna is 45° ahead of the applied current, while the phase of the other mode lags by 45°, thereby realizing the circular polarization of the microstrip antenna, which can not only simplify the feeding structure of the antenna and reduce the complexity of the design, but also reduce the phase control error and improve the accuracy of the circularly polarized radiation.

[0035] In an exemplary application scenario, Figure 1As shown, the anti-interference antenna array includes 4 B3-band RNSS receiving antennas (denoted as B3 antennas), 4 S-band RDSS receiving antennas (denoted as S antennas), 1 B1 / GPS antenna, 1 GLONASS receiving antenna (denoted as GLO antenna) and 1 L-band RDSS transmitting antenna (denoted as L transmitting antenna).

[0036] In another exemplary application scenario, Figure 2 is a schematic diagram of an optional antenna array layout according to an embodiment of the present application, such as Figure 2 As shown in the figure, the antenna array is a circularly polarized antenna array. Microstrip antennas are used as antenna units in the antenna array. The microstrip antennas can be placed on a double-sided copper-clad dielectric board whose thickness is much smaller than the wavelength. The microstrip antenna uses a single feed point feeding method to achieve circular polarization. The antenna array includes 4 B3 antenna units, 4 S antenna units, 1 B1 / GPS antenna unit, 1 GLONASS receiving antenna unit, and 1 L transmitting antenna unit.

[0037] Furthermore, in order to reduce the volume of the communication antenna structure, a low-loss dielectric substrate with a high dielectric constant (such as a dielectric constant between 10-40) is used to reduce the volume of the microstrip antenna, thereby optimizing the spacing of the antenna units. The B3 antenna unit uses a polymer ceramic material with a dielectric constant of 16 to reduce the volume of the microstrip antenna. The antenna size is 35mm×35mm×6mm, and a 4-unit array is designed. The spacing of the array is set to 0.35 wavelengths. The S antenna unit uses a polymer ceramic material with a dielectric constant of 3.5 to reduce the volume of the microstrip antenna. The antenna size is 25mm×25mm×4mm, and a 4-unit array is designed.

[0038] It is easy to understand that through the above-mentioned communication anti-interference antenna, on the one hand, in the embodiment of the present application, a microstrip antenna is used as the antenna unit, which can simplify the antenna structure and reduce the design and manufacturing costs, while reducing the volume and weight of the antenna and improving portability; on the other hand, in the embodiment of the present application, the microstrip antenna is circularly polarized using a single feed point feeding method, which maintains the phase difference required for circular polarization radiation, reduces the phase control error, and improves the accuracy of circular polarization radiation, thereby optimizing the signal reception performance; in addition, in the embodiment of the present application, a circularly polarized antenna array is used to reduce the signal loss caused by polarization mismatch and enhance the anti-interference capability of the communication antenna.

[0039] Optionally, the RF channel module includes multiple RF channels, and each RF channel includes: a low-noise amplifier, used to amplify the initial RF signal to obtain an amplified RF signal; a down-conversion unit, used to convert the amplified RF signal into an initial intermediate frequency signal, and send the initial intermediate frequency signal to the anti-interference processing module; an up-conversion unit, used to receive the target intermediate frequency signal sent by the anti-interference processing module, and convert part of the signal in a specified frequency band in the target intermediate frequency signal to obtain the target RF signal; a power amplifier, used to power amplify the combined RF signal sent by the multiplexer module, update the combined RF signal, and send the updated combined RF signal to the antenna array.

[0040] Specifically, the initial RF signal with weak signal strength is amplified by the low-noise amplifier in the RF channel module to obtain an amplified RF signal. The amplified RF signal is converted into an initial intermediate frequency signal by the down-conversion unit in the RF channel module, and the initial intermediate frequency signal is sent to the anti-interference processing module to facilitate subsequent anti-interference processing. The target intermediate frequency signal sent by the anti-interference processing is received by the up-conversion unit in the RF channel module, and part of the signal in the specified frequency band of the target intermediate frequency signal is converted and processed back to an RF signal to obtain a target RF signal, so as to transmit the target RF signal or merge the target RF signal with other signals. The combined RF signal sent by the multiplexer module is power-amplified by the power amplifier in the RF channel module, the combined RF signal is updated, and the updated combined RF signal is sent to the antenna array.

[0041] It should be noted that the above-mentioned RF channel module may also include a filtering module and an isolation optimization module to avoid interference between multiple antennas and interference between different RF channels in the RF channel module of the same antenna (such as interference of the RDSSL transmit frequency band with other receiving channels).

[0042] In an exemplary application scenario, Figure 2 As shown, the RF channel module includes multiple RF channels, and each RF channel includes four parts: a low noise amplifier, a down-conversion unit, an up-conversion unit, and a power amplifier. Among them, the low noise amplifier in each RF channel amplifies the initial RF signal received by each antenna; the down-conversion unit converts the initial RF signal into an initial intermediate frequency signal, and transmits the initial intermediate frequency signal to the anti-interference processing module for anti-interference processing; the up-conversion unit converts part of the signal of the specified frequency band in the target intermediate frequency signal after anti-interference processing (such as B3 intermediate frequency signal and S intermediate frequency signal), and converts it into a target RF signal to send to the multiplexer module for processing; the power amplifier performs power amplification processing on the combined RF signal (such as L-band transmission signal) sent by the multiplexer module, updates the combined RF signal, and sends the updated combined RF signal to the antenna array.

[0043] It is easy to understand that through the above-mentioned communication anti-interference antenna, in the embodiment of the present application, the low-noise amplifier is used to enhance the strength of the initial RF signal while maintaining the signal-to-noise ratio of the initial RF signal, which can ensure that the signal received in the subsequent signal processing stage has sufficient quality and strength; the down-conversion unit is used to reduce the complexity of the communication antenna structure and improve the accuracy and efficiency of the communication antenna signal processing; the up-conversion unit is used to achieve precise frequency control of the signal and improve the stability and quality of the transmitted signal; the power amplifier is used to ensure that the processed signal is transmitted with sufficient strength, so that the receiving end can accurately receive the signal, ensuring the reliability and effectiveness of the communication. Therefore, in the embodiment of the present application, the RF channel module is used to ensure the stability of the communication antenna receiving, processing and transmitting signals, and improve the anti-interference ability of the communication antenna.

[0044] Optionally, the anti-interference processing module includes multiple intermediate frequency channels, which correspond to multiple antenna elements in the antenna array; each intermediate frequency channel includes: an analog-to-digital conversion unit, a signal processing unit and a digital-to-analog conversion unit, wherein the analog-to-digital conversion unit is used to convert each intermediate frequency signal in the initial intermediate frequency signal from an analog signal form to a digital signal form; the signal processing unit is used to perform adaptive filtering processing on each intermediate frequency signal in the initial intermediate frequency signal in the digital signal form to obtain each intermediate frequency signal in the target intermediate frequency signal in the digital signal form; the digital-to-analog conversion unit is used to convert each intermediate frequency signal in the target intermediate frequency signal from a digital signal form to an analog signal form.

[0045] The antenna array element may include one or more antenna units.

[0046] Specifically, the anti-interference processing module includes multiple intermediate frequency channels, and each intermediate frequency channel includes: an analog-to-digital conversion unit, a signal processing unit and a digital-to-analog conversion unit. The analog-to-digital conversion unit in each intermediate frequency channel is used to receive each intermediate frequency signal in the analog form of the initial intermediate frequency signal transmitted by the down-conversion unit of the corresponding antenna array element, and each intermediate frequency signal in the analog form of the initial intermediate frequency signal is converted into a digital signal form; the signal processing unit in each intermediate frequency channel uses an adaptive filtering processing technology to perform adaptive filtering processing on each intermediate frequency signal in the initial intermediate frequency signal in the digital signal form after conversion, so as to obtain each intermediate frequency signal in the target intermediate frequency signal; the digital-to-analog conversion unit in each intermediate frequency channel is used to convert each intermediate frequency signal in the target intermediate frequency signal from a digital signal form to an analog signal form.

[0047] In an exemplary application scenario, Figure 3 is a hardware structure block diagram of an optional anti-interference processing module according to an embodiment of the present application, such as Figure 3As shown, the anti-interference signal processing module includes: power supply, analog-to-digital conversion unit (denoted as AD), signal processing unit, digital-to-analog conversion unit (denoted as DA), serial port, clock, etc. The above clock can be provided with 10MHz input by the down-conversion unit of the corresponding antenna array element. The anti-interference processing module performs anti-interference processing on various types of interference (such as broadband suppression interference, narrowband interference, single-tone interference, swept frequency interference, etc.) in the RDSSS signals of the four antenna array elements and the RNSSB3 signals of the four antenna array elements. The external input 5V power supply is converted into 1.2V, 2.5V and 3.3V respectively through the power supply chip (such as PTH05050WAH chip, LTC3412AEFE chip, TPS73125 chip, TPS73125 chip, etc.) to meet the power supply requirements of different parts of the anti-interference signal processing module.

[0048] Furthermore, the analog-to-digital conversion unit receives the RDSS intermediate frequency signal and the RNSS intermediate frequency signal in the analog initial intermediate frequency signal transmitted by the down-conversion unit of the corresponding antenna array element, and uses the first analog-to-digital conversion chip (such as the AD8138 chip) to convert the analog RDSS intermediate frequency signal and the RNSS intermediate frequency signal into a single-ended differential form, and converts them into a 16-bit digital signal form through a second analog-to-digital conversion chip (such as the AD9268 chip), and inputs them into the signal processing unit.

[0049] Furthermore, the signal processing unit performs adaptive filtering processing on each intermediate frequency signal in the initial intermediate frequency signal in the form of a digital signal (such as performing 46.52MHz±10.23MHz filtering processing on the B3 intermediate frequency signal and 47.75MHz±4.08MHz filtering processing on the S intermediate frequency signal) to obtain each intermediate frequency signal in the target intermediate frequency signal in the form of a digital signal.

[0050] Furthermore, the digital-to-analog conversion unit uses two 14-bit digital-to-analog conversion chips (such as AD9744 chips) to convert each intermediate frequency signal in the target intermediate frequency signal in the digital signal form from a digital signal form to an analog signal form.

[0051] It is easy to understand that through the above-mentioned communication anti-interference antenna, on the one hand, in the embodiment of the present application, the analog-to-digital conversion unit and the digital-to-analog conversion unit are used to realize the digitization of signal processing, improve the processing accuracy and efficiency, while reducing signal distortion and noise, and further optimize the signal quality; on the other hand, in the embodiment of the present application, adaptive filtering technology is used to enable the communication antenna to automatically adjust to adapt to different environments, thereby maintaining a high anti-interference capability under various interferences, thereby improving the robustness and anti-interference of the communication anti-interference antenna.

[0052] Optionally, the signal processing unit is a programmable gate array chip, which determines the target intermediate frequency channel corresponding to the target antenna array element among the multiple antenna array elements as the reference channel, sets the weight of the reference channel to a preset value, and the target weights of other intermediate frequency channels in the multiple intermediate frequency channels except the target intermediate frequency channel are adaptively updated in real time by the signal processing units in the other intermediate frequency channels through the power inversion criterion and the normalized least mean square algorithm.

[0053] The above-mentioned programmable gate array chip can be a highly flexible integrated circuit, which can be used to perform a variety of logical tasks. The programmable gate array chip can also be used to process digital signals (such as filtering, spectrum analysis, data conversion, etc.). The above-mentioned preset value can be used to compare and correct the signals of other intermediate frequency channels. The above-mentioned power inversion criterion can be an optimization criterion in the space-time adaptive signal processing strategy. The above-mentioned normalized least mean square algorithm can be an algorithm for adaptive filtering.

[0054] Specifically, a programmable gate array chip is selected as a signal processing unit, a target intermediate frequency channel corresponding to an antenna element in the antenna array is determined as a reference channel, the weight of the reference channel is set to a preset value in anti-interference processing, and the target weights of other intermediate frequency channels in the multiple intermediate frequency channels except the target intermediate frequency channel are adaptively updated in real time by the signal processing units in other intermediate frequency channels using the power inversion criterion and the Normalized Least Mean Squares (NLMS) algorithm.

[0055] It should be noted that each of the multiple intermediate frequency channels may be provided with a delay unit, and the delay unit may be used to assist the signal processing module of each intermediate frequency channel to perform seventh-order space-time filtering.

[0056] In an exemplary application scenario, Figure 3 As shown, the signal processing unit uses an FPGA chip (such as a XilinxXC7K325T chip), and uses the FPGA chip to perform adaptive filtering processing on each intermediate frequency signal in the initial intermediate frequency signal in the form of a digital signal, so as to obtain each intermediate frequency signal in the target intermediate frequency signal in the form of a digital signal. The target intermediate frequency channel corresponding to the fourth antenna array element in the antenna array is set as a reference channel, and the weight of the reference channel (such as 1) is set as a preset value in the anti-interference processing. The target weights of the intermediate frequency channels other than the target intermediate frequency channel in the multiple intermediate frequency channels are adaptively updated in real time through the power inversion criterion and the normalized least mean square algorithm (such as the complex NLMS algorithm) to minimize the total output power of the antenna array.

[0057] It is easy to understand that through the above-mentioned communication anti-interference antenna, in the embodiment of the present application, by determining the reference channel and adaptively updating the weights of other channels, the signal processing strategy can be adjusted in real time, the interference signal can be effectively filtered, and the anti-interference capability of the communication antenna is improved.

[0058] Optionally, the signal processing units in other intermediate frequency channels include: filters and weight update components, wherein the filter is used to filter the input vector based on the initial weights to obtain a filtered output, and the input vector is determined by the intermediate frequency signal in the current intermediate frequency channel where the filter is located; the weight update component is used to calculate the channel error based on the filtered output and the reference signal, and use the channel error, the input vector, the power inversion criterion and the normalized least mean square algorithm to update the initial weights to obtain the target weights, and the reference signal is determined by the intermediate frequency signal in the reference channel.

[0059] The filter can be a device for selectively passing or suppressing certain frequency components in a signal during signal processing. The filter output can be used to represent the state of a signal after a specific filtering effect.

[0060] The weight updating component mentioned above may be a component responsible for adjusting the filter weights to optimize the signal processing effect.

[0061] Specifically, the filter is integrated into the signal processing unit in other intermediate frequency channels, and the input vector is determined by the intermediate frequency signal in the current intermediate frequency channel where the filter is located, and the input vector is filtered based on the initial weights, and the filter output is obtained by convolution operation with the current weights of the filter. Furthermore, the weight update component is used to calculate the channel error by comparing the difference between the filter output of the filter and the reference signal, and the initial weight is updated in real time according to the power inversion criterion and the normalized least mean square algorithm to obtain a new target weight.

[0062] It is easy to understand that, through the above-mentioned communication anti-interference antenna, in the embodiment of the present application, by adaptively updating the weight of the filter, the signal processing strategy can be dynamically adjusted to improve the anti-interference performance; in addition, in the embodiment of the present application, by using the normalized least mean square algorithm, the signal can be efficiently processed in real time, which improves the real-time and stability of the communication anti-interference antenna in the process of processing signals. Therefore, through the above-mentioned technical solution, the present application can not only effectively process and suppress interference signals, but also ensure the real-time and stability of signal processing.

[0063] Optionally, the adjustment step size corresponding to the normalized least mean square algorithm is determined by the power value of the input vector, and the adjustment step size is the time step size for adaptively updating the target weight.

[0064] It is easy to understand that through the above-mentioned communication anti-interference antenna, in the embodiment of the present application, the normalized least mean square algorithm can automatically adjust the step size so that the algorithm remains stable when the input signal power fluctuates, avoiding divergence or oscillation caused by improper step size selection, and enhancing the stability of the algorithm.

[0065] Optionally, the convergence conditions of the target weights in the weight update component include: the weights of the reference channel are combined with the target weights corresponding to other intermediate frequency channels in the adaptive update, so that the total output power of the antenna array meets the minimum convergence conditions, and at the same time, the null filling direction in the radiation pattern of the antenna array is consistent with the interference signal direction.

[0066] It is easy to understand that through the above-mentioned communication anti-interference antenna, in the embodiment of the present application, the adaptive update mechanism of the weight update component is utilized, which can not only improve the anti-interference capability of the communication anti-interference antenna, but also optimize the signal processing process, thereby improving the performance of the communication anti-interference antenna.

[0067] Optionally, the power inversion criterion is used to ensure that, in the filter output of the filter, the ratio of the power of the interference signal to the power of the valid signal satisfies a minimum convergence condition during the adaptive update of the target weight.

[0068] It is easy to understand that through the above-mentioned communication anti-interference antenna, in the embodiment of the present application, the power inversion criterion is used to not only improve the anti-interference ability of the communication anti-interference antenna, but also optimize the quality of signal reception and the stability of the system, and reduce resource consumption.

[0069] In an exemplary application scenario, Figure 4 is a flowchart of an optional space-time adaptive signal processing strategy according to an embodiment of the present application, such as Figure 4 As shown, four intermediate frequency channels are designed, corresponding to four antenna array elements. A delay unit is provided in each intermediate frequency channel. Each intermediate frequency channel obtains seven taps through the delay unit, that is, the space-time filtering order can be considered to be seventh order.

[0070] Further, the space-time adaptive signal processing strategy may include: setting initial weights; filtering the input vector based on the initial weights to obtain a filter output; calculating the channel error using the reference signal and the filter output; and updating the initial weights using the channel error, the input vector, the power inversion criterion, and the normalized least mean square algorithm (such as the complex NLMS algorithm). The mathematical model of the space-time adaptive signal processing strategy is as follows.

[0071] The input vector of the tap can be expressed as formula (1).

[0072] x(n)=x I (n)+jx Q (n) Formula (1)

[0073] In formula (1), x I (n) represents the real part of the signal, x Q (n) represents the imaginary part of the signal.

[0074] The expected response can be expressed as formula (2).

[0075] d(n)=d I (n)+jd Q (n) Formula (2)

[0076] In formula (2), d I (n) represents the real part of the desired signal, d Q (n) represents the imaginary part of the desired signal.

[0077] The tap weight vector can be expressed as formula (3).

[0078] w(n)=w I (n)+jw Q (b) Formula (3)

[0079] In formula (3), w I (n) represents the real part of the tap weight vector, w Q (n) represents the imaginary part of the tap weight vector.

[0080] The filter output can be expressed as equation (4).

[0081] y(n)=y I (n)+jy Q (n) Formula (4)

[0082] In formula (4), y I (n) represents the real part of the filter output, y Q (n) represents the imaginary part of the filter output.

[0083] The estimation error can be expressed as formula (5).

[0084] e(n)=e I (n)+je Q (n) Formula (5)

[0085] Figure 5 is a model diagram of an optional normalized least mean square algorithm according to an embodiment of the present application, such as Figure 5 shown.

[0086] Filtering is performed through equations (6) and (7).

[0087]

[0088] The channel error is calculated using equations (8) and (9).

[0089] e I (n) = d I (n)-y I (n) Formula (8)

[0090] e Q (n) = d Q (n)-y Q (n) Formula (9)

[0091] The initial weights are updated using equations (10) and (11).

[0092]

[0093] Figure 6 is a flow chart of an optional normalized least mean square algorithm according to an embodiment of the present application, such as Figure 6 As shown, the space-time adaptive signal processing strategy can be composed of four channels (such as Figure 6 Each channel may include 7 taps, and the weight coefficients corresponding to the 7 taps are expressed as follows: Figure 6 As shown in w1, w2, w3, w4, w5, w6 and w7 in . In an application scenario, the target intermediate frequency channel (channel Ch4 in this example) corresponding to the fourth antenna element in the antenna array is set as the reference channel, and the weight of the reference channel is set to the preset value (such as 1) in the anti-interference processing. The target weights of the intermediate frequency channels other than the target intermediate frequency channel in the multiple intermediate frequency channels are adaptively updated in real time through the power inversion criterion and the normalized minimum mean square algorithm to minimize the total output power of the antenna array. The directional pattern synthesized by the antenna array will form a null in the interference direction. That is to say, in this example, the weights in channels Ch1, Ch2, and Ch3 are adaptively iterated based on the criterion of minimizing the mean square value of the error. y1, y2, y3, and y4 respectively represent the output signals of the four channels after being processed by a 7th-order filter, and the combined signal of the four signals is the estimated value y of the interference signal.

[0094] In another application scenario, the weight corresponding to the fourth tap in channel Ch4 is set to 1 to obtain a reference signal d. Further, the reference signal d is subtracted from the interference estimation value y to obtain the output signal after anti-interference processing. Since the algorithm actually processes complex data, the structure is relatively complex. In order to simplify the flowchart, real numbers are used.

[0095] According to another aspect of an embodiment of the present application, a navigation device is also provided, which is equipped with any one of the above-mentioned communication anti-interference antennas, and the communication anti-interference antenna is used to realize the transmission of navigation data signals between the navigation device and the communication satellite.

[0096] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiment and its optional implementation manners, which will not be described in detail here.

[0097] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0098] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0099] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0100] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0101] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0102] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can essentially or in other words contribute to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, ROM, RAM, mobile hard disks, magnetic disks or optical disks.

[0103] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A communication anti-interference antenna, characterized in that: include: Antenna array, RF channel module, anti-interference processing module and multiplexer module, among which, The antenna array is used to receive an initial radio frequency signal from a communication satellite; The RF channel module is used to convert a portion of the signals in the specified frequency band of the initial RF signal into an initial intermediate frequency signal, and to convert a target intermediate frequency signal into a target RF signal; The anti-interference processing module is used to perform anti-interference processing on the initial intermediate frequency signal according to a space-time adaptive signal processing strategy to obtain the target intermediate frequency signal, and the space-time adaptive signal processing strategy is constructed based on a normalized least mean square algorithm; The multiplexer module is used to combine the multiple target radio frequency signals in the radio frequency channel module to obtain a combined radio frequency signal; The antenna array is also used to transmit the target radio frequency signal or the combined radio frequency signal.

2. The communication anti-interference antenna according to claim 1, characterized in that: The antenna array is a circularly polarized antenna array, in which microstrip antennas are used as antenna units, and the microstrip antennas are fed in a single feeding point manner to achieve circular polarization.

3. The communication anti-interference antenna according to claim 1, characterized in that: The radio frequency channel module includes a plurality of radio frequency channels, each of which includes: A low noise amplifier, used to amplify the initial radio frequency signal to obtain an amplified radio frequency signal; A down-conversion unit, used for converting the amplified radio frequency signal into the initial intermediate frequency signal, and sending the initial intermediate frequency signal to the anti-interference processing module; An up-conversion unit, configured to receive the target intermediate frequency signal sent by the anti-interference processing module, and convert a portion of the signal in the specified frequency band in the target intermediate frequency signal to obtain the target radio frequency signal; A power amplifier is used to perform power amplification processing on the combined radio frequency signal sent by the multiplexer module, update the combined radio frequency signal, and send the updated combined radio frequency signal to the antenna array.

4. The communication anti-interference antenna according to claim 1, characterized in that: The anti-interference processing module includes multiple intermediate frequency channels, and the multiple intermediate frequency channels correspond to multiple antenna elements in the antenna array; each intermediate frequency channel includes: an analog-to-digital conversion unit, a signal processing unit and a digital-to-analog conversion unit, wherein: The analog-to-digital conversion unit is used to convert each intermediate frequency signal in the initial intermediate frequency signal from an analog signal form to a digital signal form; The signal processing unit is used to perform adaptive filtering on each intermediate frequency signal in the initial intermediate frequency signal in the form of a digital signal to obtain each intermediate frequency signal in the target intermediate frequency signal in the form of a digital signal; The digital-to-analog conversion unit is used to convert each intermediate frequency signal in the target intermediate frequency signal from a digital signal form to an analog signal form.

5. The communication anti-interference antenna according to claim 4, characterized in that: The signal processing unit is a programmable gate array chip, which determines the target intermediate frequency channel corresponding to the target antenna array element among the multiple antenna array elements as a reference channel, sets the weight of the reference channel to a preset value, and the target weights of other intermediate frequency channels among the multiple intermediate frequency channels except the target intermediate frequency channel are adaptively updated in real time by the signal processing unit in the other intermediate frequency channels through the power inversion criterion and the normalized least mean square algorithm.

6. The communication anti-interference antenna according to claim 5, characterized in that: The signal processing unit in the other intermediate frequency channel includes: a filter and a weight update component, wherein: The filter is used to filter the input vector based on the initial weights to obtain a filter output, wherein the input vector is determined by the intermediate frequency signal in the current intermediate frequency channel where the filter is located; The weight update component is used to calculate the channel error based on the filter output and the reference signal, and use the channel error, the input vector, the power inversion criterion and the normalized least mean square algorithm to update the initial weight to obtain the target weight, and the reference signal is determined by the intermediate frequency signal in the reference channel.

7. The communication anti-interference antenna according to claim 6, characterized in that: The adjustment step size corresponding to the normalized least mean square algorithm is determined by the power value of the input vector, and the adjustment step size is the time step size for adaptively updating the target weight.

8. The communication anti-interference antenna according to claim 6, characterized in that: The convergence condition of the target weight in the weight update component includes: The weight of the reference channel is combined with the target weight corresponding to the other intermediate frequency channels in the adaptive update so that the total output power of the antenna array meets the minimum convergence condition and the null direction in the directional diagram of the antenna array is consistent with the interference signal direction.

9. The communication anti-interference antenna according to claim 6, characterized in that: The power inversion criterion is used to ensure that the ratio of the power of the interference signal to the power of the effective signal in the filter output of the filter satisfies the minimum convergence condition during the adaptive update of the target weight.

10. A navigation device, characterized in that: It is equipped with a communication anti-interference antenna as described in any one of claims 1 to 9, and the communication anti-interference antenna is used to realize the transmission of navigation data signals between the navigation device and the communication satellite.

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