A loran c and gnss combined magnetic antenna

Abstract

The utility model relates to navigation positioning and time service technical field, and disclose a kind of Loran C and GNSS combined magnetic antenna, including main body structure, the main body structure includes base, sealing washer, sealing ring, coupling circuit board, magnetic antenna and microstrip antenna, the magnetic antenna is equipped with two groups, the coupling circuit board is fixedly connected using M3 screw and the upper surface of base, two groups The magnetic antenna is fixedly connected by point gum mode and the two sides of coupling circuit board upper surface, the microstrip antenna is fixedly connected using M3 screw and the intermediate position of coupling circuit board upper surface. The utility model is integrated in the same shell by integrated structure layout, microstrip antenna and two groups of magnetic antenna, effectively shorten antenna overall height to about 0.1 meter, and antenna overall streamline, the structure design of miniaturization, improve anti-interference performance and portability, solve the problem that traditional separation type antenna space occupies big, transportation assembly is inconvenient.

Description

Technical Field

[0001] This utility model relates to the field of navigation, positioning and timing technology, and more specifically, to a Roland C and GNSS combined magnetic antenna. Background Technology

[0002] Therefore, current technology for the antenna components of satellites and the Loland C navigation and timing system involves using separate antennas for signal reception. Satellite antennas can be divided into active and passive antennas. Passive antennas are ceramic antennas, mainly used in small consumer products for receiving space satellite signals. Active antennas are typically used in devices or vehicle-mounted systems, where the distance between the device and the satellite receiving module often exceeds 1 meter. In such cases, active antennas are used, and low-noise amplifiers amplify the signal at the antenna front end to compensate for signal attenuation from the antenna connection cables. Loland C antennas generally use 1-3 meter long whip antennas, which are vertically grounded monopole antennas and are widely used horizontal omnidirectional antennas.

[0003] Analysis of existing Roland C and GNSS combined receiving magnetic antenna technology reveals that when used on dedicated equipment, the Roland C and GNSS signals cannot be simultaneously received, resulting in limited antenna performance. Furthermore, the antenna occupies a large space and is difficult to install, maintain, and carry. Therefore, this invention provides a Roland C and GNSS combined magnetic antenna to solve the above problems. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, this utility model provides a Roland C and GNSS combined magnetic antenna, which has the advantage of realizing the integrated design of the two antennas.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a Roland C and GNSS combined magnetic antenna, comprising: a main structure, the main structure including a base, a sealing gasket, a sealing ring, a coupling circuit board, a magnetic antenna and a microstrip antenna, the magnetic antenna being provided in two sets, the coupling circuit board being fixedly connected to the upper surface of the base with M3 screws, the two sets of magnetic antennas being fixedly connected to both sides of the upper surface of the coupling circuit board by adhesive dispensing, and the microstrip antenna being fixedly connected to the middle position of the upper surface of the coupling circuit board with M3 screws; The protective structure includes an outer shell, an antenna top, a feeder connector, and a sealing base. The lower surface of the outer shell is fixedly connected to the upper surface of the base using M3 screws. The feeder connector is a BNC or SMA connector and is installed inside the side wall of the outer shell. One end of the feeder connector is electrically connected to the coupling circuit board, and the other end is used to connect a twisted pair feeder.

[0006] As a preferred embodiment of this utility model, the outer surface of the base is fixedly connected to a mounting seat, and the mounting seat has multiple sets of fixing holes inside.

[0007] As a preferred embodiment of this utility model, the lower surface of the sealing gasket is fixedly connected to the upper surface of the base, the sealing ring is fixedly connected to the inner surface of the sealing gasket, the lower surface of the sealing ring is fixedly connected to the upper surface of the base, and both the sealing gasket and the sealing ring are made of EPDM rubber.

[0008] As a preferred embodiment of this utility model, the coupling circuit board is an active circuit board that integrates differential traces, multi-stage active amplifier circuits, gain adjustment circuits, LC resonant filter circuits, electrostatic discharge protection circuits, and power frequency AC interference suppression circuits.

[0009] As a preferred technical solution of this utility model, the two sets of magnetic antennas are composed of coils wound with enameled wire on a magnetic rod, and the two ends of the coils are soldered to the signal input terminals of the coupling circuit board for sensing Loran C long-wave signals.

[0010] As a preferred embodiment of this invention, the microstrip antenna is used to receive and transmit linearly polarized waves in all directions and can completely suppress cross-polarized interference with completely opposite rotation directions.

[0011] As a preferred technical solution of this utility model, the outer shell and the top of the antenna are made of resin material, and the top of the antenna is a cover structure that is sealed to the top of the outer shell and is waterproof.

[0012] In a preferred embodiment of this utility model, the sealing seat is fixedly connected to the inner surface of the lower end of the outer shell, the lower surface of the outer shell is in contact with the upper surface of the sealing gasket, and the inner surface of the sealing seat is in contact with the outer surface of the sealing ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model integrates a microstrip antenna and two sets of magnetic antennas into the same housing through an integrated structural layout, effectively shortening the overall height of the antenna to about 0.1 meters, and solving the problems of large space occupation and inconvenient transportation and assembly of traditional separate antennas; 2. The outer shell and the top of the antenna of this utility model are made of resin material to achieve lightweighting. The waterproof design of the sealing gasket and sealing ring between the top of the antenna and the outer shell improves the reliability of outdoor use. The detachable protective structure facilitates later maintenance. In addition, the overall streamlined and miniaturized structural design of the antenna improves anti-interference performance and portability. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the structure of this utility model; Figure 3 This is a schematic cross-sectional view of the main structure of this utility model; Figure 4 This is a partial exploded view of the structure of this utility model; Figure 5 This is a schematic cross-sectional view of the structure of this utility model.

[0015] In the diagram: 1. Main structure; 11. Base; 12. Mounting seat; 13. Sealing gasket; 14. Sealing ring; 15. Coupled circuit board; 16. Magnetic antenna; 17. Microstrip antenna; 2. Protective structure; 21. Outer shell; 22. Antenna top; 23. Feeder connector; 24. Sealing seat. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figures 1 to 5 As shown, this utility model provides a Roland C and GNSS combined magnetic antenna, including: a main structure 1, the main structure 1 including a base 11, a sealing gasket 13, a sealing ring 14, a coupling circuit board 15, a magnetic antenna 16 and a microstrip antenna 17. The magnetic antenna 16 is provided in two sets. The coupling circuit board 15 is fixedly connected to the upper surface of the base 11 by M3 screws. The two sets of magnetic antennas 16 are fixedly connected to both sides of the upper surface of the coupling circuit board 15 by adhesive dispensing. The microstrip antenna 17 is fixedly connected to the middle position of the upper surface of the coupling circuit board 15 by M3 screws. The protective structure 2 includes a housing 21, an antenna top 22, a feeder connector 23, and a sealing seat 24. The lower surface of the housing 21 is fixedly connected to the upper surface of the base 11 with M3 screws. The feeder connector 23 is a BNC or SMA connector and is installed inside the side wall of the housing 21. One end of the feeder connector 23 is electrically connected to the coupling circuit board 15, and the other end is used to connect the twisted pair feeder.

[0018] The base 11 has a mounting seat 12 fixedly connected to its outer surface, and the mounting seat 12 has multiple sets of fixing holes inside.

[0019] With the mounting base 12 and multiple sets of fixing holes, the antenna can be fixed at multiple points and rigidly connected between the installation positions using bolts. This can significantly reduce the overall weight and vibration impact of the antenna, thereby effectively improving the stability of the antenna during use.

[0020] The lower surface of the sealing gasket 13 is fixedly connected to the upper surface of the base 11, the sealing ring 14 is fixedly connected to the inner surface of the sealing gasket 13, and the lower surface of the sealing ring 14 is fixedly connected to the upper surface of the base 11. Both the sealing gasket 13 and the sealing ring 14 are made of EPDM rubber.

[0021] Ethylene propylene diene monomer (EPDM) rubber is a synthetic rubber with no unsaturated double bonds in its molecular structure. It has extremely strong resistance to ozone, ultraviolet rays, and high and low temperatures. Its high elastic recovery rate allows it to maintain its sealing performance even after long-term compression, effectively preventing moisture and salt spray in the aviation / marine environment from entering the internal cavity of the antenna and avoiding damage to the coupling circuit board 15, magnetic antenna 16, and microstrip antenna 17 due to moisture. In addition, its low density is in line with the overall lightweight design of the antenna.

[0022] Among them, the coupling circuit board 15 is an active circuit board that integrates differential traces, multi-stage active amplifier circuits, gain adjustment circuits, LC resonant filter circuits, anti-static breakdown protection circuits, and power frequency AC interference suppression circuits.

[0023] Electrostatic discharge (ESD) protection circuit: A TVS diode (SMBJ6.5CA) is connected in parallel to the signal input to prevent ESD damage. Power frequency AC interference suppression circuit: A 100nF ceramic capacitor and a 1kΩ resistor are connected in series to filter out 50Hz power frequency interference. Multi-stage active amplifier circuit: A three-stage operational amplifier (OPA847) is used, with each stage having a gain of 20dB and a total gain of 60dB, meeting the requirements for weak signal amplification. LC resonant filter circuit: A 10μH inductor and a 100pF capacitor form a series resonant circuit with a resonant frequency of 100kHz, filtering out noise outside the Roland C band. Gain adjustment circuit: A sliding rheostat (3296W-103) is used to adjust the feedback resistor of the amplifier circuit, achieving a gain adjustable from 0 to 60dB.

[0024] Among them, the two sets of magnetic antennas 16 are composed of coils wound on a magnetic rod with enameled wire. The two ends of the coils are soldered to the signal input terminals of the coupling circuit board 15 for sensing Loran C long-wave signals.

[0025] The ferrite rods of the two sets of magnetic antennas 16 are made of Mn-Zn ferrite material, with a length of 50mm and a diameter of 8mm. The enameled wire is made of copper wire with a diameter of 0.1mm and has 200 turns.

[0026] Among them, the microstrip antenna 17 is used to receive and transmit linearly polarized waves in all directions and can completely suppress cross-polarized interference with completely opposite rotation directions.

[0027] The substrate of the microstrip antenna 17 is made of ceramic material with a dielectric constant of 20. The substrate size is 30mm×30mm×5mm. Its radiating element is designed as a square patch. The operating frequency covers 1575.42MHz (GPS L1 band) and 1227.60MHz (GLONASS G1 band) of GNSS. Since the receiving frequencies of the microstrip antenna 17 and the two sets of magnetic antennas 16 are significantly different, there is no signal interference between adjacent frequencies.

[0028] The outer shell 21 and the antenna top 22 are made of resin material. The antenna top 22 is a cover structure that is sealed to the top of the outer shell 21 and is waterproof.

[0029] Resin materials possess the characteristics of low dielectric constant and low dielectric loss: on the one hand, they have strong penetration for long-wave Loran C and high-frequency GNSS signals, unlike metal materials which shield electromagnetic waves, ensuring that dual-band signals in the air can smoothly enter the antenna and be effectively received by the microstrip antenna GNSS signal and the magnetic antenna Loran C signal; on the other hand, low dielectric loss can reduce the energy attenuation of the signal during the penetration process, avoiding a decrease in the signal-to-noise ratio due to the material. The density of resin materials is much lower than that of metal materials, which can significantly reduce the overall weight of the antenna while meeting the structural strength requirements.

[0030] The sealing seat 24 is fixedly connected to the inner surface of the lower end of the outer shell 21, the lower surface of the outer shell 21 is in contact with the upper surface of the sealing gasket 13, and the inner surface of the sealing seat 24 is in contact with the outer surface of the sealing ring 14.

[0031] The sealing performance inside the housing 21 can be further improved by setting the sealing seat 24 and the sealing ring 14.

[0032] The working principle and usage process of this utility model are as follows: First, using the fixing holes on the mounting base 12 on the outer surface of the base 11, the antenna is fixed in the required position with bolts to ensure a stable installation; then, the twisted pair feeder is connected to the feeder connector 23 to realize the signal connection between the antenna and the external device; after that, the antenna can work normally. During operation, the two sets of magnetic antennas 16 will sense the Loran C long-wave signal and transmit it to the coupling circuit board 15, while the microstrip antenna 17 receives the GNSS signal and transmits it to the circuit board; the coupling circuit board 15, as an active circuit board, amplifies the two weak signals through an integrated multi-stage active amplifier circuit, and the processed signal is transmitted to the external device through the feeder connector 23 electrically connected to the coupling circuit board 15; during use, the sealed and waterproof design of the outer shell 21 and the top of the antenna 22, as well as the cooperation of the sealing gasket 13, sealing ring 14, and sealing seat 24, can effectively isolate external moisture, salt spray, etc., and protect the internal components. If maintenance is required later, the protective structure 2 can be disassembled to inspect or replace the internal components.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A Loran C and GNSS combined magnetic antenna, characterized in that, include: The main structure (1) includes a base (11), a sealing gasket (13), a sealing ring (14), a coupling circuit board (15), a magnetic antenna (16), and a microstrip antenna (17). The magnetic antenna (16) is provided in two sets. The coupling circuit board (15) is fixedly connected to the upper surface of the base (11) with M3 screws. The two sets of magnetic antennas (16) are fixedly connected to both sides of the upper surface of the coupling circuit board (15) by dispensing glue. The microstrip antenna (17) is fixedly connected to the middle position of the upper surface of the coupling circuit board (15) with M3 screws. The protective structure (2) includes a housing (21), an antenna top (22), a feeder connector (23), and a sealing seat (24). The lower surface of the housing (21) is fixedly connected to the upper surface of the base (11) with M3 screws. The feeder connector (23) is a BNC or SMA connector and is installed inside the side wall of the housing (21). One end of the feeder connector (23) is electrically connected to the coupling circuit board (15), and the other end is used to connect the twisted pair feeder.

2. The Loran C and GNSS combined magnetic antenna according to claim 1, characterized in that: The outer surface of the base (11) is fixedly connected to the mounting seat (12), and the mounting seat (12) has multiple sets of fixing holes inside.

3. The Loran C and GNSS combined magnetic antenna according to claim 1, characterized in that: The lower surface of the sealing gasket (13) is fixedly connected to the upper surface of the base (11), the sealing ring (14) is fixedly connected to the inner surface of the sealing gasket (13), the lower surface of the sealing ring (14) is fixedly connected to the upper surface of the base (11), and both the sealing gasket (13) and the sealing ring (14) are made of EPDM rubber.

4. The Loran C and GNSS combined magnetic antenna according to claim 1, characterized in that: The coupling circuit board (15) is an active circuit board that integrates differential traces, multi-stage active amplifier circuits, gain adjustment circuits, LC resonant filter circuits, electrostatic discharge protection circuits, and power frequency AC interference suppression circuits.

5. A Loran C and GNSS combined magnetic antenna according to claim 1, characterized in that: The two sets of magnetic antennas (16) are made of enameled wire wound into coils on a magnetic rod. The two ends of the coils are soldered to the signal input terminals of the coupling circuit board (15) for sensing Loran C long-wave signals.

6. A Loran-C and GNSS combined magnetic antenna according to claim 1, characterized in that: The microstrip antenna (17) is used to receive and transmit linearly polarized waves in all directions and can completely suppress cross-polarized interference with completely opposite rotation directions.

7. A Roland C and GNSS combined magnetic antenna according to claim 1, characterized in that: The outer shell (21) and the antenna top (22) are made of resin material. The antenna top (22) is a cover structure that is sealed to the top of the outer shell (21) and is waterproof.

8. A Loran C and GNSS combined magnetic antenna according to claim 1, characterized in that: The sealing seat (24) is fixedly connected to the inner surface of the lower end of the outer shell (21), the lower surface of the outer shell (21) is in contact with the upper surface of the sealing gasket (13), and the inner surface of the sealing seat (24) is in contact with the outer surface of the sealing ring (14).

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