CN217281188U

CN217281188U - Low-cost reference station antenna choke

Info

Publication number: CN217281188U
Application number: CN202220970853.8U
Authority: CN
Inventors: 汪漪; 占兆昕; 张顶林; 马元; 孙中亮
Original assignee: Shenzhen Huada Beidou Technology Co ltd
Current assignee: Shenzhen Huada Beidou Technology Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-08-23
Anticipated expiration: 2032-04-25

Abstract

The embodiment of the utility model discloses a low-cost antenna choke coil of a reference station, which comprises a base arranged in the center and 5 concentric choke rings arranged on the periphery of the base in sequence, wherein 5 concentric circular grooves are formed between the base and the 5 choke rings; the choke ring is gradually reduced in height from inside to outside and is pyramid-shaped; the outer edges of the tops of the four choke rings are on the same straight line; the choke ring and the base are made of plastic materials, and the surface of the choke ring and the base are plated with metal layers. The utility model discloses a plastic material is moulded plastics back whole electroplating and is replaced metal choke, and cost and weight are reduced has made things convenient for the installation of measuring antenna, has improved the product competitiveness of test antenna.

Description

Low-cost reference station antenna choke

Technical Field

The utility model relates to a navigation antenna technical field especially relates to a low-cost reference station antenna choke.

Background

Global satellite navigation system refers to a space-based radio navigation positioning system that provides users with all-weather 3-dimensional coordinates and velocity and time information at any location on the earth's surface or in near-earth space, based on the principle that the satellite-to-user distance measurement is based on the difference between the time of transmission of the satellite signals and the time of arrival at the receiver, called pseudorange, which requires the reception of at least signals from 4 satellites in order to calculate the user's three-dimensional position and receiver clock bias. With the development of global integration, satellite navigation systems have applications in various fields such as aviation, automobile navigation, communication, surveying and mapping, entertainment and the like.

Currently, there are four major satellite positioning systems around the world: the Global Positioning System (GPS) in the united states, the global navigation satellite system (GLONASS) in russia, the galileo satellite positioning system in the european space agency, and the beidou navigation satellite positioning system in china.

With the continuous development of satellite navigation technology, satellite navigation precision measurement technology has been widely applied in many fields, the quality of a measurement type antenna directly affects the measurement precision of a satellite navigation receiver, and the multipath effect and the change of a phase center of the measurement type antenna are main reasons affecting the performance of the measurement type antenna.

Signals are reflected or scattered when encountering obstacles such as mountains, lake buildings, vehicles, etc. during propagation, and the paths traveled by the signals when reaching a receiver are longer than the paths traveled by direct signals, which are called multipath signals. Multipath signals are always delayed with respect to the direct signal and may have attenuated or enhanced amplitudes. When multipath signals and direct signals enter a receiver at the same time, the amplitude and phase relations of the multipath signals and the direct signals are mutually superposed, errors or distortions may occur in pseudo-range measurement and carrier phase measurement, the ranging accuracy is reduced, and complete lock losing of the receiver may be caused.

The specific methods for attenuating the multipath influence mainly include selecting a suitable receiving environment, using a receiver with a multipath cancellation technique, using an antenna having a multipath suppression effect function, and the like. When the delay of the multipath signal is large, the receiver using the technique of multipath cancellation can cancel the error, but when the delay is small, the receiver can hardly cancel the error, and in this case, an antenna having a multipath suppression effect, such as a choke antenna, or the like, can be used.

The antenna choke coil is a substrate structure consisting of a plurality of concentric circular grooves with certain depth and used as an antenna connecting bottom plate, the number of the concentric circular grooves is generally 3 to 5, the groove depth is about 1/4 wavelength generally, so that the surface of the choke coil presents high impedance characteristic and surface wave is prevented from being formed on the surface of the choke coil, the gain distribution of the antenna is changed, the backward gain and low elevation gain of the antenna are reduced, and the effect of restraining multipath effect is achieved.

The antenna choke can be roughly classified into four types of a single-slot deep single-feed choke, a double-slot deep double-feed choke, a full-band 2D choke, and a full-band 3D choke in terms of structure. At present, 3D chokes supporting the full band are commonly used in the market and are composed of 5 concentric circular slots, and the tested full-band 3D chokes have the strongest multipath suppression capability (relative to other chokes) in the whole navigation frequency band.

The choke coil is too large in size, is usually manufactured by metal machining, is high in cost and heavy in weight, and seriously influences the cost and the installation of the measuring antenna with the choke coil.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a technical problem who solves provides a low-cost reference station antenna choke to reduce cost.

In order to solve the above technical problem, an embodiment of the present invention provides a low-cost antenna choke coil for a reference station, including a base disposed at a center and 5 concentric choke rings sequentially disposed at a periphery of the base, wherein 5 concentric circular grooves are formed between the base and the 5 choke rings; the choke ring is gradually reduced in height from inside to outside and is pyramid-shaped; the outer edges of the tops of the four choke rings are on the same straight line; the choke ring and the base are made of plastic materials, and the surface of the choke ring and the base are plated with metal layers.

Further, the choke ring is 4mm thick.

Furthermore, symmetrical reinforcing ribs are arranged on the choke ring.

The beneficial effects of the utility model are that: the utility model discloses a plastic material is moulded plastics back whole electroplating and is replaced the metal choke, and cost and weight are reduced has made things convenient for the installation of measurement antenna, has improved the product competitiveness of test antenna.

Drawings

Fig. 1 is a perspective view of an angle of a low-cost antenna choke of a reference station according to an embodiment of the present invention.

Fig. 2 is a perspective view of another angle of the low-cost antenna choke of the embodiment of the present invention.

Fig. 3 is a top view of a low cost reference station antenna choke in accordance with an embodiment of the present invention.

Description of the reference numerals

The device comprises a base 1, a choke ring 2, a groove 3 and a concentric circular groove.

Detailed Description

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 3, a low-cost antenna choke of a reference station according to an embodiment of the present invention includes a base disposed at a center and 5 concentric choke rings sequentially disposed at a periphery of the base.

The utility model discloses a choke supports the full frequency channel of navigation location, and the size is 320 x 110 mm. 5 concentric circular grooves are formed between the base and the 5 choke rings. The height of the choke ring is gradually reduced from inside to outside and is pyramid-shaped. The top outer edges of the four-turn choke rings are on the same straight line, namely the height of the choke rings is required to be connected into a diagonal line. The choke ring and the base are made of plastic materials, and the surfaces of the choke ring and the base are plated with metal layers. Preferably, the choke ring is correspondingly notched, so that the receiving antenna can operate in a wider frequency band and multipath interference of the surrounding environment to the receiving antenna is suppressed.

The utility model discloses a low-cost reference station antenna choke adopts ASA material injection moulding, then electroplates, because the choke does not require selective plating, so electroplating process is simple, and is with low costs, optional low-cost electroplating scheme (like water electroplating etc.). The utility model discloses also can use plastic materials such as polypropylene (PP), Polycarbonate (PC), ABS, PC + ABS, nylon (PA), polystyrene to make.

After the electroplated low-cost reference station antenna choke coil is installed with the full-band navigation antenna, the full-band navigation antenna is compared with the same navigation antenna using the metal choke coil, and the test result shows that all performances are not different.

As an embodiment, the choke ring has a thickness of 4 mm.

In one embodiment, the choke ring is provided with symmetrical ribs.

The utility model discloses also can be used for other choke schemes such as single groove deep single feed choke, double flute deep double-fed choke, full frequency channel 2D choke.

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

Claims

1. A low-cost antenna choke coil of a reference station is characterized by comprising a base arranged in the center and 5 concentric choke rings sequentially arranged on the periphery of the base, wherein 5 concentric circular grooves are formed between the base and the 5 choke rings; the height of the choke ring is gradually reduced from inside to outside and is pyramid-shaped; the top outer edges of the 5 choke rings are on the same straight line; the choke ring and the base are made of plastic materials, and the surface of the choke ring and the base are plated with metal layers.

2. The low cost reference station antenna choke of claim 1, wherein said choke ring is 4mm thick.

3. A low cost reference station antenna choke in accordance with claim 1, wherein said choke ring is provided with symmetrical reinforcing ribs.