GNSS signal radio frequency fiber remote system

Abstract

The utility model discloses GNSS signal radio frequency optical fiber remote system, including GNSS outdoor receiving antenna, far end light transmitter, near end light receiver and indoor transmitting antenna, GNSS outdoor receiving antenna is used for receiving outdoor GNSS signal, and far end light transmitter is connected with GNSS outdoor receiving antenna and is used for receiving the outdoor GNSS signal of GNSS outdoor receiving antenna receiving and converts into optical signal, and near end light receiver is connected with far end light transmitter through optical fiber line, and near end light receiver is used for receiving optical signal and converts into radio frequency signal, and indoor transmitting antenna is connected with near end light receiver and is used for receiving radio frequency signal and broadcasting, the utility model has the advantages of reasonable in design, signal stability, strong anti -interference nature etc.

Description

Technical Field

[0001] This utility model belongs to the technical field of fiber optic remote extension systems, specifically relating to a GNSS signal radio frequency fiber optic remote extension system. Background Technology

[0002] Radio Frequency Over Fiber (RFoF) systems are a technology for transmitting radio frequency (RF) signals over optical fibers. The core principle is to convert RF electrical signals into optical signals, utilizing the low-loss and wide-bandwidth characteristics of optical fibers for long-distance transmission. The signals are then converted back into RF electrical signals via photoelectric conversion. Essentially, it is the "fiber-based carrier of RF signals." Its core components include a front-end receiving unit, an optical transmission unit, an optical fiber transmission link, and a remote transmitting unit. However, existing RFoF systems still suffer from weak interference resistance and poor stability. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a GNSS signal radio frequency fiber optic remote extension system with strong anti-interference capabilities and good stability.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] GNSS signal radio frequency fiber optic remote extension system, including:

[0006] GNSS outdoor receiving antenna, used to receive outdoor GNSS signals;

[0007] The remote optical transmitter is connected to the GNSS outdoor receiving antenna and is used to receive the outdoor GNSS signals received by the GNSS outdoor receiving antenna and convert them into optical signals;

[0008] The near-end optical receiver is connected to the far-end optical transmitter via an optical fiber line. The near-end optical receiver is used to receive optical signals and convert them into radio frequency signals.

[0009] And an indoor transmitting antenna, connected to a near-end optical receiver and used to receive radio frequency signals and broadcast them;

[0010] The remote optical transmitter includes a first power input unit, a first reverse connection protection unit, a first power indicator unit, a first voltage regulator unit, a power supply unit, a first signal amplification unit, a first impedance matching unit, a first filtering unit, a first optical signal RF signal conversion unit, an optical power automatic control unit, and a first optical indicator unit. The first power input unit is connected to the first reverse connection protection unit. The first reverse connection protection unit is connected to the first power indicator unit and the first voltage regulator unit. The first voltage regulator unit is connected to the power supply unit, the first signal amplification unit, and the first optical signal RF signal conversion unit. The power supply unit is connected to and supplies power to the GNSS outdoor receiving antenna. The first signal amplification unit is connected to the first impedance matching unit and the GNSS outdoor receiving antenna. The first impedance matching unit is connected to the first filtering unit. The first filtering unit is connected to the first optical signal RF signal conversion unit. The first optical signal RF signal conversion unit is connected to the optical power automatic control unit and the first optical indicator unit.

[0011] The near-end optical receiver includes a second power input unit, a second reverse connection protection unit, a second power indicator unit, a second voltage regulator unit, a second optical signal RF signal conversion unit, a second impedance matching unit, a second filtering unit, a second signal amplification unit, and a second optical indicator unit. The second power input unit is connected to the second reverse connection protection unit. The second reverse connection protection unit is connected to the second power indicator unit and the second voltage regulator unit. The second voltage regulator unit is connected to the second optical signal RF signal conversion unit and the second signal amplification unit. The second signal amplification unit is connected to the second filtering unit and the indoor transmitting antenna. The second optical signal RF signal conversion unit is connected to the second impedance matching unit and the second optical indicator unit. The second optical signal RF signal conversion unit is connected to the first optical signal RF signal conversion unit via optical fiber. The second impedance matching unit is connected to the second filtering unit.

[0012] Preferably, the indoor transmitting antenna is any one of a mushroom-shaped antenna, a fiberglass antenna, a ceiling-mounted antenna, and a rod antenna.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects:

[0014] The remote optical transmitter of this utility model is equipped with a first signal amplification unit, a first impedance matching unit, a first filtering unit, a first optical signal-RF signal conversion unit, an optical power automatic control unit, and other structures. In specific applications, it can amplify signals and filter out signals other than GNSS frequency bands after impedance matching. The overall signal is stable and has strong anti-interference ability.

[0015] Similarly, the near-end optical receiver is equipped with a second signal amplification unit, a second impedance matching unit, a second filtering unit, and a second optical signal to radio frequency signal conversion unit. In specific applications, it can convert optical signals into radio frequency signals, filter out signals other than GNSS frequency bands after impedance matching, and then transmit the signals. The overall design is reasonable, the signal is stable, and the anti-interference ability is strong.

[0016] In summary, this utility model has the advantages of reasonable design, stable signal, and strong anti-interference ability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the remote optical transmitter of this utility model;

[0019] Figure 3 This is a modular block diagram of the structure inside the remote optical transmitter of this utility model;

[0020] Figure 4 This is the optical path and circuit schematic diagram of the remote optical transmitter of this utility model;

[0021] Figure 5 This is a schematic diagram of the near-end optical receiver of this utility model;

[0022] Figure 6 This is a block diagram of the internal structure of the near-end optical receiver of this utility model;

[0023] Figure 7 This is the optical path and circuit schematic diagram of the near- and far-end optical receiver of this utility model. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0026] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example 1

[0030] In this embodiment, a GNSS signal radio frequency fiber optic remote transmission system is proposed, which can complete long-distance signal transmission in complex environments, solve the problem of insufficient GNSS signal coverage in complex environments, has anti-interference capabilities, and provides stable signal transmission.

[0031] like Figures 1-7 As shown, in one embodiment of this utility model, the GNSS signal radio frequency fiber optic remote extension system of this utility model includes a GNSS outdoor receiving antenna, a far-end optical transmitter, a near-end optical receiver, and an indoor transmitting antenna. The GNSS outdoor receiving antenna is used to receive outdoor GNSS signals. The far-end optical transmitter is connected to the GNSS outdoor receiving antenna and is used to receive the outdoor GNSS signals received by the GNSS outdoor receiving antenna and convert them into optical signals. The near-end optical receiver is connected to the far-end optical transmitter through an optical fiber. The far-end optical transmitter transmits the optical signals to the near-end optical receiver through an optical fiber. The near-end optical receiver is used to receive the optical signals and convert them into radio frequency signals. The indoor transmitting antenna is connected to the near-end optical receiver and is used to receive radio frequency signals and broadcast them, thereby solving the problem of insufficient GNSS signal coverage. The indoor transmitting antenna of this utility model can be any one of a mushroom-shaped antenna, a fiberglass antenna, a ceiling-mounted antenna, or a rod antenna.

[0032] Specific reference Figure 2The following is a specific structural example of the remote optical transmitter of this utility model. The remote optical transmitter is equipped with an RF IN interface, a DC IN interface, an optical output interface, an optical indicator LED, and a power indicator LED. Further details can be found by referring to... Figure 3 and Figure 4 The remote optical transmitter includes a first power input unit, a first reverse connection protection unit, a first power indicator unit, a first voltage regulator unit, a power supply unit, a first signal amplification unit, a first impedance matching unit, a first filtering unit, a first optical signal RF signal conversion unit, an optical power automatic control unit, and a first optical indicator unit. The first power input unit is connected to the first reverse connection protection unit. The first reverse connection protection unit is connected to the first power indicator unit and the first voltage regulator unit. The first voltage regulator unit is connected to the power supply unit, the first signal amplification unit, and the first optical signal RF signal conversion unit. The power supply unit is connected to and supplies power to the GNSS outdoor receiving antenna. The first signal amplification unit is connected to the first impedance matching unit and the GNSS outdoor receiving antenna. The first impedance matching unit is connected to the first filtering unit. The first filtering unit is connected to the first optical signal RF signal conversion unit. The first optical signal RF signal conversion unit is connected to the optical power automatic control unit and the first optical indicator unit.

[0033] It is understood that the first power input unit includes a DC IN interface and connects to an external power adapter through the DC IN interface. The power adapter is connected to the mains power. Specifically, 220V AC power is converted to 12V DC power by the power adapter and enters the remote optical transmitter through the DC IN interface. After passing through the first reverse connection protection unit (the first reverse connection protection unit is used to ensure that the remote optical transmitter of this utility model will not be burned even if the positive and negative terminals of the power supply are reversed), one path enters the first power indicator unit. When the power indicator LED is green, it indicates that the power supply is normal; otherwise, the power supply is abnormal. The other path reaches the first voltage regulator unit, so that a stable 5V DC voltage can be obtained, which can then supply the various unit modules inside the remote optical transmitter of this utility model, such as the feed unit, the first signal amplification unit, and the first optical signal RF signal conversion unit. When powering the feed unit, the 5V power is output through the RFIN interface of the feed unit to power the GNSS outdoor receiving antenna.

[0034] The GNSS signal received by the outdoor GNSS receiving antenna enters the remote optical transmitter through the RF IN interface. Then, the signal is amplified by the first amplification unit. The amplified signal is impedance matched by the first impedance matching unit, and then filtered by the first filtering unit to remove signals other than the GNSS frequency band, retaining only the GNSS frequency band signal. The signal then enters the LD- of the laser diode in the first optical signal-RF signal conversion unit to complete the conversion from RF signal to optical signal, and is finally output through the optical output interface. At the same time, the PD- of the laser diode in the first optical signal-RF signal conversion unit also receives the optical signal. One path is adjusted by the optical power automatic control unit in real time to maintain a stable power output, and the other path enters the first optical indicator unit to indicate whether there is an optical signal output. When there is an optical signal output, the optical indicator LED lights up green; when there is no optical signal output, the optical indicator LED does not light up.

[0035] For more details, please refer to Figure 5 The following is a specific structural example of the near-end optical receiver of this utility model. The near-end optical receiver is equipped with an RF OUT interface, a DC IN interface, an optical input interface, an optical indicator LED, and a power indicator LED. See also... Figure 6 and Figure 7 The near-end optical receiver includes a second power input unit, a second reverse connection protection unit, a second power indicator unit, a second voltage regulator unit, a second optical signal RF signal conversion unit, a second impedance matching unit, a second filtering unit, a second signal amplification unit, and a second optical indicator unit. The second power input unit is connected to the second reverse connection protection unit. The second reverse connection protection unit is connected to the second power indicator unit and the second voltage regulator unit. The second voltage regulator unit is connected to the second optical signal RF signal conversion unit and the second signal amplification unit. The second signal amplification unit is connected to the second filtering unit and the indoor transmitting antenna. The second optical signal RF signal conversion unit is connected to the second impedance matching unit and the second optical indicator unit. The second optical signal RF signal conversion unit is connected to the first optical signal RF signal conversion unit via optical fiber. The second impedance matching unit is connected to the second filtering unit.

[0036] It is understood that the second power input unit includes the DC IN interface of the near-end optical receiver and connects to an external power adapter through the DC IN interface. The power adapter is connected to the mains power. Specifically, 220V AC power is converted to 12V DC power by the power adapter and enters the near-end optical receiver through the DC IN interface. After passing through the second reverse connection protection unit (the second reverse connection protection unit is used to ensure that the near-end optical receiver of this utility model will not be burned even if the positive and negative terminals of the power supply are reversed), one path enters the second power indicator unit. When the power indicator LED of the near-end optical receiver is green, it indicates that the power supply is normal. Otherwise, the power supply is abnormal. The other path reaches the second voltage regulator unit, so that a stable 5V DC voltage can be obtained, which can then supply the various unit modules inside the near-end optical receiver of this utility model, such as the second signal amplification unit and the second optical signal RF signal conversion unit, etc.

[0037] The optical input interface on the near-end optical receiver is connected to an optical fiber, while the other end of the optical fiber is connected to the optical output interface of the far-end optical transmitter. The far-end optical transmitter converts the radio frequency signal into an optical signal and outputs it through the optical output interface to the optical fiber, and then to the optical input interface on the near-end optical receiver. This optical input interface is connected to the second optical signal-to-radio frequency conversion unit. The photodiode of the second optical signal-to-radio frequency conversion unit converts the optical signal into an radio frequency signal, and then outputs it to the second impedance matching unit (for better signal matching with subsequent unit modules) and then to the second filtering unit, where signals other than those in the GNSS band are filtered out again. The signal is then amplified by the second amplification unit and output through the RF OUT interface. The RF OUT interface is specifically connected to the indoor transmitting antenna, meaning the signal is output to the indoor transmitting antenna and broadcast by the indoor transmitting antenna. At the same time, the optical signal received by the photodiode of the second optical signal-to-radio frequency conversion unit also enters the second optical indicator unit. When there is an optical signal input, the optical indicator LED of the near-end optical receiver lights up green; when there is no optical signal input, the optical indicator LED of the near-end optical receiver does not light up.

[0038] This invention is applicable to long-distance signal transmission scenarios, such as tunnels, mines, and high-rise buildings. It can also be applied to indoor signal coverage scenarios, such as various occasions requiring indoor GNSS signal coverage, including aircraft manufacturing and maintenance, scientific research laboratories, underground parking lots, GPS stores, indoor demonstration halls, etc. The far-end optical transmitter and near-end optical receiver of this invention can also be applied to product testing scenarios, including factory production lines (such as smartphones, vehicle navigation systems, PDAs, tablets, electronic dogs, satellite positioning and tracking equipment, etc.), laboratories, research institutions, or other application environments. This invention provides stable overall signal and strong anti-interference capabilities.

[0039] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A GNSS signal radio frequency fiber optic remote extension system, characterized in that, include: GNSS outdoor receiving antenna, used to receive outdoor GNSS signals; The remote optical transmitter is connected to the GNSS outdoor receiving antenna and is used to receive the outdoor GNSS signals received by the GNSS outdoor receiving antenna and convert them into optical signals; The near-end optical receiver is connected to the far-end optical transmitter via an optical fiber line. The near-end optical receiver is used to receive optical signals and convert them into radio frequency signals. And an indoor transmitting antenna, connected to a near-end optical receiver and used to receive radio frequency signals and broadcast them; The remote optical transmitter includes a first power input unit, a first reverse connection protection unit, a first power indicator unit, a first voltage regulator unit, a power supply unit, a first signal amplification unit, a first impedance matching unit, a first filtering unit, a first optical signal RF signal conversion unit, an optical power automatic control unit, and a first optical indicator unit. The first power input unit is connected to the first reverse connection protection unit. The first reverse connection protection unit is connected to the first power indicator unit and the first voltage regulator unit. The first voltage regulator unit is connected to the power supply unit, the first signal amplification unit, and the first optical signal RF signal conversion unit. The power supply unit is connected to and supplies power to the GNSS outdoor receiving antenna. The first signal amplification unit is connected to the first impedance matching unit and the GNSS outdoor receiving antenna. The first impedance matching unit is connected to the first filtering unit. The first filtering unit is connected to the first optical signal RF signal conversion unit. The first optical signal RF signal conversion unit is connected to the optical power automatic control unit and the first optical indicator unit. The near-end optical receiver includes a second power input unit, a second reverse connection protection unit, a second power indicator unit, a second voltage regulator unit, a second optical signal RF signal conversion unit, a second impedance matching unit, a second filtering unit, a second signal amplification unit, and a second optical indicator unit. The second power input unit is connected to the second reverse connection protection unit. The second reverse connection protection unit is connected to the second power indicator unit and the second voltage regulator unit. The second voltage regulator unit is connected to the second optical signal RF signal conversion unit and the second signal amplification unit. The second signal amplification unit is connected to the second filtering unit and the indoor transmitting antenna. The second optical signal RF signal conversion unit is connected to the second impedance matching unit and the second optical indicator unit. The second optical signal RF signal conversion unit is connected to the first optical signal RF signal conversion unit via optical fiber. The second impedance matching unit is connected to the second filtering unit.

2. The GNSS signal radio frequency fiber optic remote extension system according to claim 1, characterized in that: The indoor transmitting antenna can be any one of a mushroom-shaped antenna, a fiberglass antenna, a ceiling-mounted antenna, or a rod antenna.

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