Navigation high-precision multi-beam antenna

Abstract

The invention relates to a navigation high-precision multi-beam antenna. The system is specifically composed of a multi-beam antenna module, a multi-channel radio frequency module and an anti-interference digital module. The multi-beam antenna module is composed of a plurality of fixed pointing narrow beam units, each beam has stable phase center and sidelobe suppression capability, and each narrow beam unit can independently receive signals; all beam receiving signals are subjected to frequency conversion, filtering and sampling through the multi-channel radio frequency module and then enter the anti-interference digital module, the anti-interference digital module distributes the receiving weight of each signal according to a signal correlation result and flexibly switches among beams, and then stable receiving of the signals is completed. According to the invention, the problem of high precision in an interference environment can be effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of navigation antennas, and in particular to a navigation high-precision multi-beam antenna. Background Art

[0002] The Global Satellite Navigation System is a space-based radio navigation system that can provide three-dimensional position and time information for ground, air and medium and low orbit satellite users. It has the advantages of wide coverage, high precision and all-weather operation. It plays an increasingly important role in core areas such as military, aviation and life safety.

[0003] As an important part of the ground segment of the satellite navigation system, the monitoring station plays a decisive role in the calculation of satellite orbits and clock errors, among which the performance of the monitoring receiving antenna is one of the main factors. However, since the global satellite navigation system signal is very weak when it reaches the ground, the signal received by the monitoring receiving antenna is easily interfered by the external environment. Therefore, anti-interference is an unavoidable problem in all navigation application scenarios, especially the anti-interference problem of high-precision antennas, which has no better solution. For traditional omnidirectional high-precision antennas, they do not have the ability to resist broadband suppression interference, and weak electromagnetic interference can cause the receiver to fail to work; and the use of antenna arrays for anti-interference cannot effectively solve the phase center fluctuation and multipath suppression problems, resulting in a decrease in high-precision performance. Therefore, the high-precision problem in the current interference environment cannot be effectively solved. Summary of the invention

[0004] Based on this, it is necessary to provide a high-precision multi-beam navigation antenna to address the above technical problems.

[0005] A navigation high-precision multi-beam antenna, the multi-beam antenna comprising: a multi-beam antenna module, a multi-channel radio frequency module and an anti-interference digital module; The multi-beam antenna module is composed of a plurality of fixed-point narrow-beam antenna units, the narrow beams formed by the narrow-beam antenna units are closely arranged, the beam coverage ranges overlap with each other, and together complete the coverage of the upper hemisphere, so as to equivalently realize an omnidirectional beam; The multi-channel radio frequency module is composed of radio frequency channels having the same number as the narrow beam antenna units, and the radio frequency channels are used to perform frequency conversion, filtering and sampling on the beam receiving signals output by the multi-beam antenna module; The anti-interference digital module is used to select the beam with the strongest signal relative to the interference for capture according to the power and spatial distribution of the signal and the interference, so as to realize the anti-interference function.

[0006] In one of the embodiments, the multi-beam antenna module is composed of multiple fixed-pointing narrow-beam antenna units, the narrow beams formed by the antenna units are closely arranged, the beam coverage ranges overlap with each other, and together complete the beam coverage of the upper hemisphere, thereby equivalently realizing an omnidirectional beam; the antenna unit realizes broadband signal reception in a fixed-pointing area, the operating frequency covers all satellite navigation frequencies, the phase center within the beam range is stable, the sidelobe level is low, a single antenna unit integrates a filter, a limiter and a low-noise amplifier module, and has the functions of receiving signal limiting, low-noise amplification and filtering. The limiting function is used to limit the output amplitude under the condition of extremely strong power in the band; the amplification function is used to amplify the input signal to the target level without distortion; the filtering function is used to filter out-of-band interference signals.

[0007] In one of the embodiments, the anti-interference digital module selects the beam with the strongest signal relative to the interference for capture based on the power and spatial distribution of the signal and the interference, and assigns it to the navigation receiver for tracking and processing; for a single satellite incident signal, the sampling signals of all N beams of the receiving antenna are first assigned a weight value w, and each beam signal is then correlated and accumulated with the local reference signal in two paths, I and Q, and then the correlated accumulated values ​​of each beam are compared, and the beam with the largest accumulated value is selected as the beam for receiving the satellite signal, and the weight of the beam is set to 1, and the weights of other beams are set to 0, thereby achieving the selection of the optimal anti-interference beam, and the weighted capture information is finally transmitted to the navigation receiver for signal tracking and positioning solution processing.

[0008] In one of the embodiments, the multi-beam antenna module is composed of a multi-beam Luneburg lens antenna and a low noise amplifier module group; the multi-beam Luneburg lens antenna is composed of a spherical Luneburg lens and a feed array, and the feed array is composed of a plurality of identical broadband right-handed circularly polarized antenna units, which are placed at the surface focal position of the spherical Luneburg lens to achieve multiple fixed-pointing narrow beam characteristics.

[0009] In one of the embodiments, the spherical Luneburg lens is composed of 4 layers of discrete dielectric spheres with different radii and dielectric constants, the first layer is a uniform dielectric sphere, the ratio of radius to maximum radius is 0.53, and the last three layers are designed according to an approximately equal thickness layering method; the feed array is composed of 34 broadband right-hand circularly polarized antenna units, and the feed array is evenly distributed on the periphery of the Luneburg lens, and is divided into four layers in total, with 1 antenna unit in the first layer, 6 antenna units in the second layer, 12 antenna units in the third layer, and 15 antenna units in the fourth layer; the angle between the antenna units between the layers is the 3dB beam width after beam focusing, and the broadband right-hand circularly polarized antenna units in the layer are evenly distributed at the same rotation angle according to the antenna unit size and circumference, and the feed array ensures that the feed spacing is greater than 0.5 wavelength by adjusting the distance from the outer surface of the Luneburg lens.

[0010] In one embodiment, the multi-beam antenna module also includes: a low-noise amplifier module group; the low-noise amplifier module group includes multiple independent low-noise amplifier modules, which are connected to the output port of the multi-beam Luneburg lens antenna; the low-noise amplifier module contains a signal input port, a signal output port and a power supply and monitoring interface, and the low-noise amplifier module is internally composed of a limiting circuit, a pre-stage filter circuit, a low-noise amplifier circuit, a post-stage filter circuit and a power supply and monitoring circuit. The pre-stage filter circuit, the limiting circuit, the low-noise amplifier circuit and the post-stage filter circuit are connected in sequence, the pre-stage filter circuit is connected to the signal input port, the post-stage filter circuit is connected to the signal output port, and the power supply and monitoring circuit is connected to the power supply and monitoring interface.

[0011] In one of the embodiments, the multi-channel RF module is composed of multiple independent RF channels; each of the RF channels includes: a frequency converter and a sampler.

[0012] In one embodiment, the frequency converter includes an input signal filtering module, a power adjustment module, a local oscillator module, a frequency conversion module, an output signal filtering module, an integrated control module and a power supply module, and is composed of a signal input port, a signal output port, a local oscillator input interface, a power supply interface and a communication interface.

[0013] In one of the embodiments, the sampler includes a filtering module, a digital-to-analog conversion module, a clock module, a power supply module and a monitoring module sampler, which consists of a radio frequency signal input port, an optical signal output port, a local oscillator input interface, a power supply interface and a communication interface.

[0014] The above-mentioned navigation high-precision multi-beam antenna is composed of a multi-beam antenna module, a multi-channel radio frequency module and an anti-interference digital module. The multi-beam antenna module is composed of a plurality of fixed-pointing narrow beam units, each beam has a stable phase center and sidelobe suppression capability, and each narrow beam unit can receive signals independently; all beam receiving signals are converted, filtered and sampled by the multi-channel radio frequency module before entering the anti-interference digital module, and the anti-interference digital module allocates the receiving weight of each signal according to the signal correlation result, and flexibly switches between beams to complete the stable reception of the signal. This application comprehensively utilizes the characteristics of the antenna such as beam focusing, high stable phase and low side lobes, transforms the omnidirectional high-precision antenna into a multi-narrow beam high-precision antenna, and realizes the anti-interference function through beam switching based on the correlator, and finally realizes a high-precision monitoring receiving antenna with anti-interference function, which can effectively solve the high-precision problem in the interference environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a principle block diagram of a navigation high-precision multi-beam antenna in one embodiment; Figure 2A schematic diagram of the structure of a multi-beam Luneburg lens antenna in one embodiment; Figure 3 A schematic diagram of a low noise amplifier module group in one embodiment; Figure 4 is a schematic diagram of a frequency converter in one embodiment; Figure 5 is a schematic diagram of a sampler in one embodiment; Figure 6 Schematic diagram of an anti-interference digital module in one embodiment. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0017] In one embodiment, Figure 1 As shown, a navigation high-precision multi-beam antenna is provided, comprising: Multi-beam antenna module, multi-channel radio frequency module and anti-interference digital module; the multi-beam antenna module is composed of multiple fixed-point narrow beam antenna units, the narrow beams formed by each narrow beam antenna unit are closely arranged, the beam coverage range overlaps each other, and together completes the beam coverage of the upper hemisphere, equivalently realizing an omnidirectional beam, a single narrow beam antenna unit integrates a filter, a limiter and a low-noise amplifier, and has the functions of receiving signal limiting, low-noise amplification and filtering; the multi-channel radio frequency module is composed of the same number of radio frequency channels as the narrow beam antenna units, and the radio frequency channels are used to frequency convert, filter and sample the beam receiving signal output by the multi-beam antenna module; the anti-interference digital module is used to select the beam with the strongest signal relative to the interference for capture according to the power and spatial distribution of the signal and the interference, so as to realize the anti-interference function.

[0018] The above-mentioned navigation high-precision multi-beam antenna is composed of a multi-beam antenna module, a multi-channel radio frequency module and an anti-interference digital module. The multi-beam antenna module is composed of a plurality of fixed-pointing narrow beam units, each beam has a stable phase center and sidelobe suppression capability, and each narrow beam unit can receive signals independently; all beam receiving signals are converted, filtered and sampled by the multi-channel radio frequency module before entering the anti-interference digital module, and the anti-interference digital module allocates the receiving weight of each signal according to the signal correlation result, and flexibly switches between beams to complete the stable reception of the signal. This application comprehensively utilizes the characteristics of the antenna such as beam focusing, high stable phase and low side lobes, transforms the omnidirectional high-precision antenna into a multi-narrow beam high-precision antenna, and realizes the anti-interference function through beam switching based on the correlator, and finally realizes a high-precision monitoring receiving antenna with anti-interference function, which can effectively solve the high-precision problem in the interference environment.

[0019] In one of the embodiments, the multi-beam antenna module is composed of multiple fixed-pointing narrow-beam antenna units. The narrow beams formed by the antenna units are closely arranged, and the beam coverage ranges overlap with each other, jointly completing the beam coverage of the upper hemisphere, and equivalently realizing an omnidirectional beam; the antenna unit realizes broadband signal reception in a fixed-pointing area, the operating frequency covers all satellite navigation frequencies, and the phase center within the beam range is stable, the sidelobe level is low, and a single antenna unit integrates a filter, a limiter and a low-noise amplifier module, and has the functions of receiving signal limiting, low-noise amplification and filtering. The limiting function is used to limit the output amplitude under the condition of extremely strong power in the band; the amplification function is used to amplify the input signal to the target level without distortion; the filtering function is used to filter out-of-band interference signals.

[0020] In one embodiment, if Figure 2 As shown, the multi-beam Luneburg lens antenna is composed of a spherical Luneburg lens and a feed array. The Luneburg lens has beam focusing capability, which can achieve narrow beam high gain and sidelobe suppression performance. At the same time, the highly rotationally symmetrical spherical shape can ensure that the radiation characteristics at all angles in the airspace are basically consistent. The feed array is composed of multiple identical broadband right-hand circularly polarized antenna units, which are placed at the surface focus position of the spherical Luneburg lens to achieve multiple fixed-pointing narrow beams.

[0021] In another embodiment, the spherical Luneburg lens is composed of 4 layers of discrete dielectric spheres with different radii and dielectric constants. The first layer is a uniform dielectric sphere with a radius to maximum radius ratio of 0.53. The last three layers are designed according to an approximately equal-thickness layering method. The dielectric constant of each layer is calculated based on the theoretical formula of the Luneburg lens dielectric constant and radius. The discrete dielectric lens is easy to implement in engineering, and by optimizing the radius and dielectric constant of each layer, the performance of the Luneburg lens similar to that of a continuous medium distribution can be achieved.

[0022] In addition, the feed array consists of 34 broadband right-hand circularly polarized antenna units, which are evenly distributed around the periphery of the Luneburg lens. There are four layers in total, with 1 antenna unit in the first layer, 6 antenna units in the second layer, 12 antenna units in the third layer, and 15 antenna units in the fourth layer. The angle between the antenna units in each layer is the 3dB beam width after beam focusing, to ensure that the overlapping gain of adjacent beams is only 3dB lower than the maximum gain, thereby ensuring that the antenna has stable and excellent gain performance within the required elevation angle range. The antenna units in the layer are evenly distributed at the same rotation angle according to the size and circumference of the antenna unit to ensure that the antenna beam can cover the entire azimuth. The feed array ensures that the feed spacing is greater than 0.5 wavelength by adjusting the distance from the outer surface of the Luneburg lens to avoid the influence of coupling between feed sources on radiation performance.

[0023] In one embodiment, the multi-beam antenna module also includes: a low-noise amplifier module group; the low-noise amplifier module group includes multiple independent low-noise amplifier modules, which are connected to the output port of the multi-beam Luneburg lens antenna; the low-noise amplifier module contains a signal input port, a signal output port and a power supply and monitoring interface, and the low-noise amplifier module is internally composed of a limiting circuit, a pre-stage filter circuit, a low-noise amplifier circuit, a post-stage filter circuit and a power supply and monitoring circuit. The pre-stage filter circuit, the limiting circuit, the low-noise amplifier circuit and the post-stage filter circuit are connected in sequence, the pre-stage filter circuit is connected to the signal input port, the post-stage filter circuit is connected to the signal output port, and the power supply and monitoring circuit is connected to the power supply and monitoring interface.

[0024] In this embodiment, Figure 3 As shown, the low noise amplifier module group includes multiple independent low noise amplifier modules, which are connected to the output port of the multi-beam Luneburg lens antenna. The multi-beam Luneburg lens antenna receives the signal first and enters the limiting circuit inside the low noise amplifier. The limiting circuit is mainly used to limit the signal amplitude output when there is a strong interference signal in the received signal band to prevent the strong signal from damaging the subsequent circuit. After passing through the limiting circuit, the signal is output to the pre-stage filter circuit. The main function of this circuit is to filter out the out-of-band interference signal at the lowest possible insertion loss to ensure that the low noise amplifier can work normally under interference. After passing through the pre-stage filter circuit, the signal is output to the low noise amplifier circuit, which mainly amplifies the input signal to the target power with low noise. After passing through the low noise amplifier circuit, the signal is output to the final filter circuit, which mainly suppresses the out-of-band interference signal to below the target value. The low noise amplifier module contains a power supply and monitoring circuit inside. This circuit mainly converts the external power supply into the voltage required for the operation of each internal chip, and monitors the working status of the low noise amplifier such as voltage, current level, temperature, etc. The modules communicate using bus communication.

[0025] In one embodiment, the multi-channel RF module is composed of multiple independent RF channels; each RF channel includes: a frequency converter and a sampler.

[0026] Specifically, the isolation between channels is greater than 60dB, and the group delay consistency is better than 0.2ns. Considering the need for long-distance lossless transmission of signals, the multi-channel RF module can also be configured with an optoelectronic converter, which has a flexible configuration of optoelectronic conversion function, can convert the sampled digital signal into an optical signal, and can use optical fiber to transmit the sampled signal over a long distance to the anti-interference digital module at the back end.

[0027] In one embodiment, if Figure 4 As shown, the frequency converter includes an input signal filtering module, a power adjustment module, a local oscillator module, a frequency conversion module, an output signal filtering module, an integrated control module and a power supply module, and is composed of a signal input port, a signal output port, a local oscillator input interface, a power supply interface and a communication interface.

[0028] Specifically, the frequency converter includes frequency conversion and filtering functions. The frequency conversion function can select the application scenario to convert the received signal to high frequency or medium frequency, and the filtering function can select to switch signals of different frequencies as needed to complete out-of-band interference suppression, local oscillator suppression and image suppression.

[0029] In terms of function, the external input signal first passes through the input signal filtering module. The filtering module is composed of a radio frequency switching switch and a filter group (A1 filter group, A2 filter group, A3 filter group...An filter group). The filter module switches different types of filter modules under the control command to realize the filtering function of the input signal, filter out the out-of-band interference of the input signal and realize the image suppression function to prevent the interference signal from affecting the normal operation of the subsequent circuit; after passing through the input signal filtering module, the signal enters the power adjustment module. The power adjustment module is composed of an amplifier, an adjustable attenuator and a power detection chip. The power adjustment module detects the input signal power and reports the detected power information. The power adjustment module adjusts the input signal power according to the external control command; after passing through the power adjustment module, the signal enters the frequency conversion module. The frequency conversion module is mainly composed of a frequency converter and an external matching module. The frequency conversion module receives the local oscillator signal output by the local oscillator module and completes the signal input signal frequency conversion function in the frequency conversion module; after passing through the frequency conversion module, the signal enters the output signal filtering module to realize the filtering function of the clutter signal of the frequency converted signal, and the signal is output externally after filtering. The local oscillator module receives the external reference signal and generates the local oscillator signal required by the system according to the control information; the power supply module converts the external power supply into the voltage required for the operation of each internal chip; the integrated control module reports the frequency conversion working status such as input signal power, module attenuation value, local oscillator frequency, filter module selection and other information to the outside, and converts the received external control information into the control parameters of each module inside the inverter.

[0030] In one embodiment, if Figure 5 As shown, the sampler includes a filtering module, a digital-to-analog conversion module, a clock module, a power supply module and a photoelectric conversion module, and is composed of a radio frequency signal input port, an optical signal output port, a local oscillator input interface, a power supply interface and a communication interface.

[0031] Specifically, the sampler includes filtering and sampling functions. The filtering function can select to switch different frequency signals as required. The sampling function is assisted by high-quality clock signals and stable power supply. The digital-to-analog conversion module samples the RF signal without distortion or aliasing. It also has the current and temperature detection of the entire system to ensure the normal operation of the cooling system. If the frequency conversion module outputs a high-frequency signal, the sampler adopts the RF sampling solution; if the frequency conversion module outputs an intermediate frequency signal, the sampler adopts the intermediate frequency sampling solution.

[0032] Functionally, after the external input signal enters the sampler, it first passes through the filter module, which is composed of an RF switch and a filter group (B1 filter group, B2 filter group, B3 filter group...Bn filter group). The filter module switches different types of filter modules under the control command to realize the filtering function of the input signal, avoiding the out-of-band noise of the input signal causing the sampling signal to be distorted or aliased; after the signal passes through the filter module, it is output to the digital-to-analog conversion module, which is composed of a digital-to-analog conversion chip and its matching circuit. The module completes the sampling function of the input signal under the drive of the external sampling clock; after sampling, the RF signal becomes a digital signal, which is processed in the photoelectric conversion module and converted into an optical signal for external output. The clock generation module receives the external input reference signal and generates the sampling clock signal required by the system according to the control information; the power supply module converts the external power supply into the voltage required for the operation of each internal chip; the integrated control module reports the frequency conversion working status such as the input signal frequency, filter module selection information, sampling clock, current and temperature to the outside, and converts the received external control information into the control parameters of each module inside the sampler.

[0033] like Figure 6 As shown, the anti-interference digital module selects the beam with the strongest signal relative to the interference for capture according to the power and spatial distribution of the signal and the interference, and allocates it to the navigation receiver for tracking processing.

[0034] Specifically, the anti-interference digital module mainly selects the beam with the strongest signal relative to interference for capture based on the power and spatial distribution of the signal and interference, and assigns it to the navigation receiver for tracking and processing. For a single satellite incident signal, the sampling signals of all N beams of the receiving antenna are first assigned a weight value w, and each beam signal is then correlated and accumulated with the local reference signal in two ways, I and Q. Then, the correlation accumulation values ​​of each beam are compared, and the beam with the largest accumulation value is selected as the beam for receiving the satellite signal, and the weight of the beam is set to 1, and the weights of other beams are set to 0, thereby realizing the selection of the optimal anti-interference beam. The weighted capture information is finally transmitted to the navigation receiver for signal tracking and positioning solution processing.

[0035] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A navigation high-precision multi-beam antenna, characterized in that: The multi-beam antenna includes: a multi-beam antenna module, a multi-channel radio frequency module and an anti-interference digital module; The multi-beam antenna module is composed of a plurality of fixed-point narrow-beam antenna units. The narrow beams formed by the narrow-beam antenna units are closely arranged, and the beam coverage ranges overlap with each other, so as to jointly complete the beam coverage of the upper hemisphere, and equivalently realize an omnidirectional beam. A single narrow-beam antenna unit integrates a filter, a limiter and a low-noise amplifier, and has the functions of receiving signal limiting, low-noise amplification and filtering. The multi-channel radio frequency module is composed of radio frequency channels having the same number as the narrow beam antenna units, and the radio frequency channels are used to perform frequency conversion, filtering and sampling on the beam receiving signals output by the multi-beam antenna module; The anti-interference digital module is used to select the beam with the strongest signal relative to the interference for capture according to the power and spatial distribution of the signal and the interference, so as to realize the anti-interference function.

2. The navigation high-precision multi-beam antenna according to claim 1, characterized in that: The narrow beam antenna unit realizes broadband signal reception in a fixed pointing area, the operating frequency covers all satellite navigation frequency points, and the phase center is stable within the beam range, the side lobe level is low, and the limiter is used to limit the output amplitude under the condition of extremely strong power in the band; the low noise amplifier is used to amplify the input signal to the target level without distortion; The filter is used to filter out-of-band interfering signals.

3. The navigation high-precision multi-beam antenna according to claim 1, characterized in that: The anti-interference digital module selects the beam with the strongest signal relative to the interference for capture according to the power and spatial distribution of the signal and the interference, and allocates it to the navigation receiver for tracking and processing; for a single satellite incident signal, the sampling signals of all N beams of the receiving antenna are first assigned a weight value w, and each beam signal is then correlated and accumulated with the local reference signal in two paths, I and Q, and then the correlation accumulated values ​​of each beam are compared, and the beam with the largest accumulated value is selected as the beam for satellite signal reception, and the weight of the beam is set to 1, and the weights of other beams are set to 0, thereby realizing the selection of the optimal anti-interference beam, and the weighted capture information is finally transmitted to the navigation receiver for signal tracking and positioning solution processing.

4. The navigation high-precision multi-beam antenna according to claim 2, characterized in that: The multi-beam antenna module is realized by a multi-beam Luneburg lens antenna and a low noise amplifier module group; The multi-beam Luneburg lens antenna is composed of a spherical Luneburg lens and a feed array. The feed array is composed of a plurality of identical broadband right-handed circularly polarized antenna units, which are placed at the surface focal position of the spherical Luneburg lens to achieve multiple fixed-pointing narrow beam characteristics.

5. The navigation high-precision multi-beam antenna according to claim 4, characterized in that: The spherical Luneburg lens is composed of 4 layers of discrete dielectric spheres with different radii and dielectric constants, the first layer is a uniform dielectric sphere, the ratio of the radius to the maximum radius is 0.53, and the last three layers are designed according to the approximately equal thickness layering method; The feed array is composed of 34 broadband right-hand circularly polarized antenna units, which are evenly distributed around the Luneburg lens and are divided into four layers in total, with 1 antenna unit on the first layer, 6 antenna units on the second layer, 12 antenna units on the third layer, and 15 antenna units on the fourth layer; The angle between antenna units between layers is the 3dB beam width after beam focusing. The antenna units within the layer are evenly distributed at the same rotation angle according to the unit size and circumference. The feed array ensures that the feed spacing is greater than 0.5 wavelength by adjusting the distance from the outer surface of the Luneburg lens.

6. The navigation high-precision multi-beam antenna according to claim 4, characterized in that: The low-noise amplifier module group includes multiple independent low-noise amplifier modules, which are connected to the output port of the multi-beam Luneburg lens antenna; each low-noise amplifier module contains a signal input port, a signal output port and a power supply and monitoring interface, and the low-noise amplifier module is internally composed of a limiting circuit, a pre-stage filter circuit, a low-noise amplifier circuit, a post-stage filter circuit and a power supply and monitoring circuit. The pre-stage filter circuit, the limiting circuit, the low-noise amplifier circuit and the post-stage filter circuit are connected in sequence, the pre-stage filter circuit is connected to the signal input port, the post-stage filter circuit is connected to the signal output port, and the power supply and monitoring circuit is connected to the power supply and monitoring interface.

7. The navigation high-precision multi-beam antenna according to claim 1, characterized in that: The multi-channel radio frequency module is composed of multiple independent radio frequency channels; Each of the radio frequency channels includes: a frequency converter and a sampler.

8. The navigation high-precision multi-beam antenna according to claim 7, characterized in that: The frequency converter includes an input signal filtering module, a power adjustment module, a local oscillator module, a frequency conversion module, an output signal filtering module, an integrated control module and a power supply module, and is composed of a signal input port, a signal output port, a local oscillator input interface, a power supply interface and a communication interface.

9. The navigation high-precision multi-beam antenna according to claim 7, characterized in that: The sampler includes a filtering module, a digital-to-analog conversion module, a clock module, a power supply module and a monitoring module sampler, which is composed of a radio frequency signal input port, an optical signal output port, a local oscillator input interface, a power supply interface and a communication interface.

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