High-precision satellite signal antenna

Abstract

The invention discloses a high-precision satellite signal antenna, relates to the field of antennas, and solves the problem that an existing high-precision satellite signal antenna cannot meet the requirement for receiving SBAS signals. Comprising an L2 wave band patch antenna, an L1 wave band patch antenna and a PCB. The L2 wave band patch antenna is located at the bottom layer of the antenna and is arranged at the top layer of the PCB, and resonance is in a GNSS L2 wave band; the L1 wave band patch antenna is installed in the top layer radiation surface of the L2 wave band patch antenna in an overlapped mode, resonance is in the GNSS L1 wave band, and L-band frequency is included. The vertical line direction of the top layer radiation surface of the L1 wave band patch antenna is connected with a first polarization decomposition network circuit in the bottom layer of the PCB through a first feed pin, and GNSS L1 wave band signals are decomposed into right-hand and left-hand circularly polarized signals through the first polarization decomposition network circuit. The vertical line direction of the top layer radiation surface of the L2 wave band patch antenna is connected with a second polarization decomposition network circuit in the bottom layer of the PCB through a second feed pin, and GNSS L2 wave band signals are decomposed into right-hand and left-hand circularly polarized signals through the second polarization decomposition network circuit.

Description

Technical Field

[0001] The invention relates to the field of antennas, and in particular to a high-precision satellite signal antenna. Background Art

[0002] The Global Navigation Satellite System (GNSS) signal is the basis of high-precision positioning. Its basic principle is to determine the position of the receiver by measuring the distance from the satellite to the receiver and using the position information of multiple satellites. However, the positioning accuracy of relying solely on GNSS signals is affected by factors such as satellite orbit errors, ionosphere and tropospheric delays, and there are positioning errors. Satellite-Based Augmentation System (SBAS) signals can effectively correct these errors, thereby achieving the purpose of improving positioning accuracy.

[0003] In order to receive GNSS and SBAS signals, it is necessary to design a high-precision satellite signal antenna in an integrated manner. One design solution provided by the prior art is to widen the L1 band bandwidth of the GNSS antenna so that the GNSS antenna can receive L1 band right-hand circularly polarized GNSS signals and right-hand circularly polarized SBAS signals.

[0004] However, currently, the global SBAS signal can be not only a right-hand circularly polarized signal, but also a left-hand circularly polarized signal, and its frequency can be either the L1 band or the L2 band. The above-mentioned integrated design scheme for the high-precision satellite signal antenna cannot meet the needs of receiving global SBAS signals. Summary of the invention

[0005] The embodiment of the present invention proposes a high-precision satellite signal receiving antenna to solve the problem that the high-precision satellite signal antenna provided by the prior art cannot meet the need for receiving global SBAS signals.

[0006] In order to solve the above problems, an embodiment of the present invention discloses a high-precision satellite signal antenna, including: an L2 band patch antenna, an L1 band patch antenna and a printed circuit board PCB; wherein,

[0007] The L2 band patch antenna is located at the bottom layer of the antenna, arranged on the top layer of the PCB, and resonates in the GNSS L2 band of the global navigation satellite system;

[0008] The L1 band patch antenna is superimposed and installed in the top radiation surface of the L2 band patch antenna, resonating in the GNSS L1 band, and the frequency range includes the L-band frequency;

[0009] The vertical direction of the top radiation surface of the L1 band patch antenna is connected to the first polarization decomposition network circuit in the bottom layer of the PCB by using a first feed needle, the GNSS L1 band signal is input into the first polarization decomposition network circuit through the first feed needle, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L1 band are decomposed by the first polarization decomposition network circuit;

[0010] The vertical direction of the top radiating surface of the L2 band patch antenna is connected to the second polarization decomposition network circuit in the bottom layer of the PCB using a second feed needle, and the GNSS L2 band signal is input into the second polarization decomposition network circuit through the second feed needle, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L2 band are decomposed into the second polarization decomposition network circuit.

[0011] Furthermore, there are four first feed needles and four second feed needles, and the four first feed needles are orthogonally distributed along the center of the top radiating surface of the L1 band patch antenna, and the four second feed needles are orthogonally distributed along the center of the top radiating surface of the L2 band patch antenna.

[0012] Furthermore, the first feed needle and the second feed needle are in any of the following forms:

[0013] Cylindrical metal conductors, rivets and screws.

[0014] Further, the first polarization decomposition network circuit is composed of a 90° bridge, a 90° delay line and a 50 ohm load circuit; or,

[0015] The first polarization decomposition network circuit is composed of a balun and a 90° bridge.

[0016] Furthermore, the second polarization decomposition network circuit is composed of a 90° bridge, a 90° delay line and a 50 ohm load circuit. Or,

[0017] The second polarization decomposition network circuit is composed of a balun and a 90° bridge.

[0018] Furthermore, the output end of the first polarization decomposition network circuit and the output end of the second polarization decomposition network circuit are connected to the signal combination circuit in the bottom layer of the PCB, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L1 band, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L2 band are combined through the combination circuit.

[0019] Furthermore, the signal combination circuit is composed of a filter, a low noise amplifier, a combiner and a broadband amplifier.

[0020] Furthermore, the edge of the top radiating surface of the L2 band patch antenna combines the radiator of the 5G antenna and / or the radiator of the short-range wireless communication antenna, wherein the short-range wireless communication antenna includes: a Bluetooth BT linear polarization antenna and a Wi-Fi linear polarization antenna.

[0021] Furthermore, the radiator of the 5G antenna and / or the radiator of the short-range wireless communication antenna are symmetrically distributed on the edge of the top radiation surface of the L2 band patch antenna.

[0022] Furthermore, the vertical direction of the radiator of the 5G antenna is connected to the connector in the bottom layer of the PCB using a third feed pin; and / or,

[0023] The vertical direction of the radiator of the short-range wireless communication antenna is connected to the connector using a fourth feed pin.

[0024] Compared with the prior art, the technical solution provided by the embodiment of the present invention includes an L2 band patch antenna and an L1 band patch antenna, so that the technical solution provided by the embodiment of the present invention can receive global SBAS signals and GNSS signals in the L1 band and the L2 band, and solves the problem that the prior art can only receive GNSS signals and right-handed SBAS signals in the L1 band; a first polarization decomposition network circuit and a second polarization decomposition network circuit are provided, so that the technical solution provided by the embodiment of the present invention can obtain right-handed circularly polarized signals and left-handed circularly polarized signals in the GNSS L1 band, and right-handed circularly polarized signals and left-handed circularly polarized signals in the GNSS L2 band, that is, it can receive and obtain right-handed circularly polarized signals of the GNSS in the L1 band, right-handed circularly polarized signals of the SBAS in the L1 band, left-handed circularly polarized signals of the SBAS in the L1 band, right-handed circularly polarized signals of the SBAS in the L2 band, left-handed circularly polarized signals of the SBAS in the L2 band, etc., and solves the problem that the prior art can only receive right-handed circularly polarized GNSS signals and global SBAS signals in the L1 band. The first polarization decomposition network circuit and the second polarization decomposition network circuit solve the problem that the ±90° phase shifts of the right-hand circular polarization signal and the left-hand circular polarization signal of the passive antenna cancel each other and cannot be directly synthesized. The technical solution provided by the embodiment of the present invention can integrate the GNSS antenna and the SBAS antenna into an integrated design, which is simple to implement and can meet the reception requirements of global SBAS signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0026] Figure 1 A schematic longitudinal section diagram of a high-precision satellite signal antenna provided by an embodiment of the present invention;

[0027] Figure 2 A three-dimensional diagram of a high-precision satellite signal antenna provided by an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the feeding points corresponding to the feeding pins of the high-precision satellite signal antenna provided in an embodiment of the present invention;

[0029] Figure 4 One of the schematic diagrams of the first polarization decomposition network circuit in the high-precision satellite signal antenna provided by an embodiment of the present invention;

[0030] Figure 5 A second schematic diagram of a first polarization decomposition network circuit in a high-precision satellite signal antenna provided by an embodiment of the present invention;

[0031] Figure 6 A schematic diagram of a second polarization decomposition network circuit in a high-precision satellite signal antenna provided by an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of a combined circuit in a high-precision satellite signal antenna provided by an embodiment of the present invention;

[0033] Figure 8 It is the right-hand polarization pattern in the vertical plane of the GNSS L1 band;

[0034] Fig. 9 It is the right-hand polarization pattern in the vertical plane of the GNSS L2 band;

[0035] Fig.10 It is the left-hand polarization pattern in the vertical plane of the GNSS L1 band;

[0036] Fig.11 is the horizontal plane radiation pattern of the 5G antenna;

[0037] Fig.12 is the vertical plane radiation pattern of the 5G antenna;

[0038] Fig.13 It is the horizontal plane radiation pattern of BT / Wi-Fi antenna;

[0039] Fig.14 It is the vertical plane radiation pattern of BT / Wi-Fi antenna;

[0040] Fig.15 This is a schematic diagram of the 5G antenna standing wave ratio;

[0041] Fig.16 This is a schematic diagram of BT / Wi-Fi standing wave ratio.

[0042] 1-L1 band patch antenna; 2-L2 band patch antenna; 3-PCB; 4-5G antenna; 5-short-range wireless communication antenna; 6-shielding cover; 11-top radiating surface of L1 band patch antenna; 12-first feeding point corresponding to the first feed pin; 21-top radiating surface of L2 band patch antenna; 22-second feeding point corresponding to the second feed pin; 41-third feeding point corresponding to the third feed pin; 51-fourth feeding point corresponding to the fourth feed pin. DETAILED DESCRIPTION

[0043] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] In order to solve the problem that the high-precision satellite signal antenna provided by the prior art cannot meet the need for receiving SBAS signals, an embodiment of the present invention provides a high-precision satellite signal receiving antenna.

[0046] like Figure 1 and 2 As shown, the high-precision satellite signal receiving antenna provided by the embodiment of the present invention includes: an L2 band patch antenna 2, an L1 band patch antenna 1 and a printed circuit board (PCB) 3. Optionally, a shielding cover 6 may also be included.

[0047] The L2 band patch antenna 2 is located at the bottom layer of the antenna, is arranged on the top layer of the PCB 3, and resonates in the GNSS L2 band.

[0048] The L1 band patch antenna 1 is mounted on the top radiation surface 21 of the L2 band patch antenna 2, resonating in the GNSS L1 band, and the frequency range includes the L-band frequency;

[0049] The vertical direction of the top radiating surface 11 of the L1 band patch antenna 1 is connected to the first polarization decomposition network circuit in the bottom layer of the PCB 3 using a first feed needle, and the GNSS L1 band signal is input into the first polarization decomposition network circuit through the first feed needle, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L1 band are decomposed into the first polarization decomposition network circuit.

[0050] The vertical direction of the top radiating surface 21 of the L2 band patch antenna 2 is connected to the second polarization decomposition network circuit in the bottom layer of the PCB 3 using a second feed needle, and the GNSS L2 band signal is input into the second polarization decomposition network circuit through the second feed needle, and the right-hand circular polarization signal and left-hand circular polarization signal of the GNSS L2 band are decomposed into the second polarization decomposition network circuit.

[0051] In this embodiment, the L2 band patch antenna 2 uses injection molding and electroplating processes to form the top radiation surface 21 .

[0052] In this embodiment, there are four first feed pins and four second feed pins, the four first feed pins are orthogonally distributed along the center of the top radiation surface 11 of the L1 band patch antenna, and the four second feed pins are orthogonally distributed along the center of the top radiation surface 21 of the L2 band patch antenna. Figure 3 The first feeding points 12 corresponding to the four first feeding pins and the second feeding points 22 corresponding to the four second feeding pins are shown.

[0053] In this embodiment, the first feed pin and the second feed pin are in any one of the following forms: a cylindrical metal conductor, a rivet, a screw, etc.

[0054] In this embodiment, the first polarization decomposition network circuit may be composed of a 90° bridge, a 90° delay line, and a 50 ohm load circuit. Figure 4 shown. Figure 4 In the figure, feed point 1 (0°), feed point 2 (90°), feed point 3 (180°) and feed point 4 (270°) are four first feeding points corresponding to the four first feed needles respectively.

[0055] In this embodiment, the first polarization decomposition network circuit may also be composed of a balun and a 90° bridge. Figure 5 shown. Figure 5 In the figure, feed point 1 (0°), feed point 2 (90°), feed point 3 (180°) and feed point 4 (270°) are four first feeding points corresponding to the four first feed needles respectively.

[0056] Of course, the above Figure 4 and Figure 5 The first polarization decomposition network circuit shown is only a specific example. In actual use, the first polarization decomposition network circuit can also be designed into other feasible solutions, and each case will not be described here one by one.

[0057] In this embodiment, the second polarization decomposition network circuit may be composed of a 90° bridge, a 90° delay line, and a 50 ohm load circuit. Figure 6 shown.

[0058] In this embodiment, the second polarization decomposition network circuit may also be composed of a balun and a 90° bridge.

[0059] Of course, the second polarization decomposition network circuit described above is only a specific example. In actual use, the second polarization decomposition network circuit can also be designed into other feasible solutions, and each case will not be described one by one here.

[0060] Through the above Figure 4-6 The first polarization decomposition network circuit and the second polarization decomposition network circuit shown can decompose and obtain the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L1 band, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L2 band, thereby achieving the purpose of receiving and acquiring the GNSS right-hand circular polarization signal of the L1 band, the SBAS right-hand circular polarization signal of the L1 band, the SBAS left-hand circular polarization signal of the L1 band, and the SBAS right-hand circular polarization signal of the L2 band.

[0061] In this embodiment, the output end of the first polarization decomposition network circuit and the output end of the second polarization decomposition network circuit are connected to the signal combination circuit in the bottom layer of the PCB3, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L1 band and the right-hand circular polarization signal of the GNSS L2 band are combined through the combination circuit.

[0062] In this embodiment, the signal combination circuit is composed of a filter, a low noise amplifier, a combiner and a broadband amplifier. Figure 7 shown.

[0063] pass Figure 7 It can be seen from the combined circuit shown that the technical solution provided by the embodiment of the present invention not only supports the reception of L-band left-hand circular polarization and right-hand circular polarization SBAS signals, but also supports the reception of L2-band left-hand circular polarization and right-hand circular polarization SBAS signals. Four signals, L1+L-band right-hand, L-band left-hand, L2 right-hand and L2 left-hand, are output from the GNSS double-layer patch antenna through the L1 and L2 band polarization decomposition networks, and are filtered by low-loss filters of corresponding frequency bands respectively, and then amplified by low-noise amplifiers, and then after secondary filtering, the four signals are combined into one signal using a combiner, and finally amplified by a broadband amplifier and output to the GNSS and SBAS integrated receiver.

[0064] Optionally, in this embodiment, the edge of the top radiating surface 21 of the L2 band patch antenna 2 combines the radiator of the 5G antenna 4 and / or the radiator of the short-range wireless communication antenna 5, wherein the short-range wireless communication antenna 5 includes: a Bluetooth (BT) linear polarization antenna and a Wi-Fi linear polarization antenna.

[0065] In order not to affect the hemispherical shape of the directional pattern of the L2 band patch antenna 2, in this embodiment, the radiator of the 5G antenna 4 and / or the radiator of the short-range wireless communication antenna 5 are symmetrically distributed on the edge of the top radiation surface 21 of the L2 band patch antenna 2. For example, Figure 2 As shown, two radiators of 5G antennas 4 and two radiators of short-range wireless communication antennas 5 are symmetrically arranged on the edges of the top radiating surface 21 of the L2 band patch antenna 2.

[0066] In this embodiment, the vertical direction of the radiator of the 5G antenna 4 is connected to the connector in the bottom layer of the PCB2 using a third feed needle, wherein the layout of the third feed point 41 corresponding to the third feed needle can be exemplified as shown in Figure 3 As shown; and / or, the vertical direction of the radiator of the short-range wireless communication antenna 5 is connected to the connector using a fourth feed needle, wherein the layout of the fourth feed point 51 corresponding to the fourth feed needle can be exemplified as shown in Figure 3 shown.

[0067] By combining the radiator of the 5G antenna 4 and / or the radiator of the short-range wireless communication antenna 5 at the edge of the top radiating surface 21 of the L2 band patch antenna 2, 5G, BT and Wi-Fi can be integrated into one design based on the integrated design of GNSS and SBAS, so that the high-precision satellite signal antenna provided in the embodiment of the present invention can further receive 5G, BT and Wi-Fi signals, which is convenient for subsequent use.

[0068] Compared with the prior art, the technical solution provided by the embodiment of the present invention includes an L2 band patch antenna and an L1 band patch antenna, so that the technical solution provided by the embodiment of the present invention can receive global SBAS signals and GNSS signals in the L1 band and the L2 band, and solves the problem that the prior art can only receive GNSS signals and right-handed SBAS signals in the L1 band; a first polarization decomposition network circuit and a second polarization decomposition network circuit are provided, so that the technical solution provided by the embodiment of the present invention can obtain right-handed circularly polarized signals and left-handed circularly polarized signals in the GNSS L1 band, and right-handed circularly polarized signals and left-handed circularly polarized signals in the GNSS L2 band, that is, it can receive and obtain right-handed circularly polarized signals of the GNSS in the L1 band, right-handed circularly polarized signals of the SBAS in the L1 band, left-handed circularly polarized signals of the SBAS in the L1 band, right-handed circularly polarized signals of the SBAS in the L2 band, left-handed circularly polarized signals of the SBAS in the L2 band, etc., and solves the problem that the prior art can only receive right-handed circularly polarized GNSS signals and global SBAS signals in the L1 band. The first polarization decomposition network circuit and the second polarization decomposition network circuit solve the problem that the ±90° phase shifts of the right-hand circular polarization signal and the left-hand circular polarization signal of the passive antenna cancel each other and cannot be directly synthesized. The technical solution provided by the embodiment of the present invention can integrate the GNSS antenna and the SBAS antenna into an integrated design, which is simple to implement and can meet the reception requirements of global SBAS signals.

[0069] In order to enable those skilled in the art to more clearly understand the beneficial effects brought about by the technical solution provided by the embodiment of the present invention, specific experimental data are used to illustrate the effects below.

[0070] See Figure 8 The figure shows the GNSS L1 band vertical plane right-hand polarization radiation pattern. The maximum gain of the L1 band patch antenna 1 exceeds 5dBi in the L1 band, the axial ratio is less than 2dB, the gain in the low elevation angle direction of 20 degrees is about -1dBi, and the antenna radiation pattern is close to a hemispherical shape. The radiation front-to-back ratio of the L1 band patch antenna 1 is greater than 22dB, which improves the antenna efficiency and can suppress multipath interference signals, thereby improving the positioning accuracy and stability of the GNSS receiver.

[0071] See Fig. 9 As shown, it is the right-hand polarization radiation pattern of the vertical plane of the GNSS L2 band. The maximum gain of the L2 band patch antenna 2 exceeds 4dBi in the L2 band, the axial ratio is less than 3dB, the gain in the low elevation angle direction of 20 degrees is about -2dBi, and the antenna radiation pattern is close to a hemispherical shape. The radiation front-to-back ratio of the L2 band patch antenna 2 is greater than 22dB, which improves the antenna efficiency and can suppress multipath interference signals, thereby improving the positioning accuracy and stability of the GNSS receiver.

[0072] See Fig.10The figure shows the vertical plane left-hand polarization pattern of the GNSS L1 band. The maximum left-hand gain of the L1 band patch antenna 1 in the L-band exceeds 4dBi, the axial ratio is less than 1dB, the gain in the low elevation angle direction of 20 degrees is greater than -3dBi, and the antenna pattern is close to a hemispherical shape. The front-to-back ratio of the L-band antenna is greater than 22dB, which improves the antenna efficiency, and the low elevation gain is greater than -3dBi, which improves the stability of the GNSS receiver in receiving SBAS left-hand signals around the world.

[0073] See Fig.11 The figure shows the horizontal plane radiation pattern of the 5G antenna. The base station of the 5G system is set up on the ground, and the terminal is also on the ground. The horizontal direction of the terminal is uncertain, so the gain and radiation pattern circularity of the 5G antenna 4 in the horizontal plane are important indicators that affect the communication reliability of the device. When the device rotates, the smaller the gain change in the horizontal direction, the more stable the system reception signal.

[0074] See Fig.12 The figure shows the vertical radiation pattern of the 5G antenna. The base station of the 5G system is set up on the ground, and the terminal is also on the ground. The height of the base station and the elevation angle of the terminal change, which requires the terminal antenna to have a higher gain in the vertical direction of 0 to 30 degrees to ensure stable communication.

[0075] See Fig.13 The figure shows the horizontal radiation pattern of the BT / Wi-Fi antenna. Fig.14 The figure shows the vertical radiation pattern of the BT / Wi-Fi antenna. The frequency of the BT / Wi-Fi antenna only supports the 2.4GHz band, and the 5GHz band has not been evaluated. Since the BT / Wi-Fi antenna is mainly used for communication between devices and handheld devices, the communication distance is about 10 meters, and the antenna gain is not less than -10dBi, which will not affect the device communication.

[0076] See Fig.15 The figure shows a schematic diagram of the 5G antenna standing wave ratio. In this embodiment, the 5G antenna 4 only supports the low-band frequency range, and other frequencies are not evaluated. The lower the antenna standing wave ratio, the higher the transmission efficiency of the antenna and the smaller the reflection.

[0077] See Fig.16 The figure below is a schematic diagram of BT / Wi-Fi VSWR. BT / Wi-Fi only supports the 2.4GHz band, and its VSWR is less than 2.

[0078] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0079] Embodiments of the present invention may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0080] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0081] The above is a detailed introduction to a method and device for calling an image provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A high-precision satellite signal antenna, characterized in that: include: L2 band patch antenna, L1 band patch antenna and printed circuit board PCB; wherein, The L2 band patch antenna is located at the bottom layer of the antenna, arranged on the top layer of the PCB, and resonates in the GNSS L2 band of the global navigation satellite system; The L1 band patch antenna is superimposed and installed in the top radiation surface of the L2 band patch antenna, resonating in the GNSSL1 band, and the frequency range includes the L-band frequency; The vertical direction of the top radiation surface of the L1 band patch antenna is connected to the first polarization decomposition network circuit in the bottom layer of the PCB by using a first feed needle, the GNSS L1 band signal is input into the first polarization decomposition network circuit through the first feed needle, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L1 band are decomposed by the first polarization decomposition network circuit; The vertical direction of the top radiating surface of the L2 band patch antenna is connected to the second polarization decomposition network circuit in the bottom layer of the PCB using a second feed needle, and the GNSS L2 band signal is input into the second polarization decomposition network circuit through the second feed needle, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L2 band are decomposed into the second polarization decomposition network circuit.

2. The high-precision satellite signal antenna according to claim 1, characterized in that: There are four first feed needles and four second feed needles, and the four first feed needles are orthogonally distributed along the center of the top radiating surface of the L1 band patch antenna, and the four second feed needles are orthogonally distributed along the center of the top radiating surface of the L2 band patch antenna.

3. The high-precision satellite signal antenna according to claim 1, characterized in that: The first feed needle and the second feed needle may be in any of the following forms: Cylindrical metal conductors, rivets and screws.

4. The high-precision satellite signal antenna according to claim 1, characterized in that: The first polarization decomposition network circuit is composed of a 90° bridge, a 90° delay line and a 50 ohm load circuit; or, The first polarization decomposition network circuit is composed of a balun and a 90° bridge.

5. The high-precision satellite signal antenna according to claim 1, characterized in that: The second polarization decomposition network circuit is composed of a 90° bridge, a 90° delay line and a 50 ohm load circuit; or, The second polarization decomposition network circuit is composed of a balun and a 90° bridge.

6. The high-precision satellite signal antenna according to claim 1, characterized in that: The output end of the first polarization decomposition network circuit and the output end of the second polarization decomposition network circuit are connected to the signal combination circuit in the bottom layer of the PCB, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L1 band, and the right-hand circular polarization signal and the left-hand circular polarization signal of the GNSS L2 band are combined through the combination circuit.

7. The high-precision satellite signal antenna according to claim 6, characterized in that: The signal combination circuit is composed of a filter, a low noise amplifier, a combiner and a broadband amplifier.

8. The high-precision satellite signal antenna according to claim 1, characterized in that: The top radiating surface edge of the L2 band patch antenna combines the radiator of the 5G antenna and / or the radiator of the short-range wireless communication antenna, wherein the short-range wireless communication antenna includes: a Bluetooth BT linear polarization antenna and a Wi-Fi linear polarization antenna.

9. The high-precision satellite signal antenna according to claim 8, characterized in that: The radiator of the 5G antenna and / or the radiator of the short-range wireless communication antenna are symmetrically distributed on the edge of the top radiation surface of the L2 band patch antenna.

10. The high-precision satellite signal antenna according to claim 8, characterized in that: The vertical direction of the radiator of the 5G antenna is connected to the connector in the bottom layer of the PCB using a third feed pin; and / or, The vertical direction of the radiator of the short-range wireless communication antenna is connected to the connector using a fourth feed pin.

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