Dual-mode DRTD digital broadband fiber optic repeater

Abstract

The utility model provides a kind of double system DRTD digital broadband optical fiber repeater, including first system port and second system port, each system port includes transmitting end and receiving end, the transmitting end of first system port is sequentially connected to transmitting antenna by diplexer, main spare intermediate frequency board, main spare PA amplifier, RFout mouth, transmitting antenna is sequentially connected back the receiving end of first system port by first low noise amplification LNA, main spare intermediate frequency board, diplexer;The transmitting end of second system port is sequentially connected to transmitting antenna by circulator, main spare intermediate frequency board, main spare PA amplifier, RFout mouth, transmitting antenna is sequentially connected to the receiving end of second system port by switching switch, second low noise amplification LNA, main spare intermediate frequency board, circulator.The utility model supports train digital wireless dispatching system (system 1) and 450MHz train wireless dispatching system (system 2) double system application, it is relatively lower in relatively practical, cost, short construction period and it is convenient to maintain management.

Description

Technical Field

[0001] This utility model relates to the field of railway communication systems, specifically a dual-mode DRTD digital broadband fiber optic repeater. Background Technology

[0002] Currently, the 450MHz wireless train dispatching communication system is mainly used on existing conventional railways, branch lines, and dedicated railway lines. This system suffers from numerous problems, including low frequency resource utilization, poor signal transmission quality, weak anti-interference capabilities, aging equipment, and serious exceeding of its service life. Furthermore, with the innovation of railway communication technology and adjustments to national policies on radio spectrum resources, the 450MHz train wireless dispatching system will gradually be phased out of the railway communication market, thus necessitating urgent upgrading and transformation. However, upgrading existing lines faces a series of challenges, including high investment costs, lengthy development cycles, and difficulties in project approval. Utility Model Content

[0003] To address the problems of existing technologies, this utility model provides a dual-mode DRTD digital broadband fiber optic repeater. It adopts the dual-mode DRTD digital broadband fiber optic repeater working concept and supports dual-mode applications of the train digital wireless dispatching system (mode 1) and the 450MHz train wireless dispatching system (mode 2). This provides a solution that is more practical, has a relatively low cost, a short construction period, and is easy to maintain and manage.

[0004] This utility model includes a first standard port and a second standard port. Each standard port includes a transmitter and a receiver. The transmitter of the first standard port is connected to the transmitting antenna in sequence through a duplexer, a main and backup intermediate frequency board, a main and backup power amplifier (PA) and an RFout port. The transmitting antenna is connected back to the receiver of the first standard port in sequence through a first low-noise amplifier (LNA), a main and backup intermediate frequency board, and a duplexer. The transmitter of the second standard port is connected to the transmitting antenna in sequence through a circulator, a main and backup intermediate frequency board, a main and backup power amplifier (PA) and an RFout port. The transmitting antenna is connected to the receiver of the second standard port in sequence through a switch, a second low-noise amplifier (LNA), a main and backup intermediate frequency board, and a circulator.

[0005] In a further improvement, the main and backup PA amplifiers are connected to a bridge circuit, which is connected to the RFout port and a switching switch, respectively.

[0006] In a further improvement, the main and backup intermediate frequency boards include a near-end unit and a far-end unit connected by optical fiber, with the first standard port and the second standard port located on the near-end unit side, and the transmitting antenna located on the far-end unit side.

[0007] Further improvements include a first standard port operating at a frequency of 400MHz, with an uplink frequency of 403.2MHz to 404.2MHz and a downlink frequency of 413.2MHz to 414.2MHz.

[0008] Further improvements include a second standard port operating frequency of 450MHz, with an uplink frequency of 457MHz~459MHz and a downlink frequency of 457MHz~459MHz for the same frequency and 467MHz~469MHz for different frequencies.

[0009] Since conventional railways, railway branch lines, and local railways are not of a high grade and have relatively low traffic density, the dual-mode DRTD digital broadband fiber optic repeater concept is adopted to support the dual-mode application of the train digital wireless dispatching system (mode 1) and the 450MHz train wireless dispatching system (mode 2). This provides a solution that is more practical, relatively low-cost, has a short construction period, and is easy to maintain and manage.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. It adopts a dual-system integrated design, which can process signals of two systems simultaneously, reducing the number of devices to be installed and the space required, and lowering the equipment maintenance cost and management difficulty;

[0012] 2. Two standards are available, and can be configured via software according to on-site requirements to meet diverse user scenarios;

[0013] 3. Sampling digital processing technology, resulting in high signal processing accuracy;

[0014] 4. Using optical fiber as the transmission medium has the advantages of low transmission loss and strong anti-interference ability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the module structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the hardware structure of the near-end unit.

[0018] Figure 3 This is a schematic diagram of the hardware structure of the remote unit. Detailed Implementation

[0019] 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 scope of protection of the present utility model.

[0020] This utility model is as follows Figure 1 As shown, there are a first standard port and a second standard port. Each standard port includes a transmitter and a receiver. The transmitter of the first standard port is connected to the transmitting antenna in sequence through a duplexer, a main and backup intermediate frequency board, a main and backup power amplifier (PA) and an RFout port. The transmitting antenna is connected back to the receiver of the first standard port in sequence through a first low-noise amplifier (LNA), a main and backup intermediate frequency board, and a duplexer. The transmitter of the second standard port is connected to the transmitting antenna in sequence through a circulator, a main and backup intermediate frequency board, a main and backup power amplifier (PA) and an RFout port. The transmitting antenna is connected to the receiver of the second standard port in sequence through a switch, a second low-noise amplifier (LNA), a main and backup intermediate frequency board, and a circulator.

[0021] In a further improvement, the main and backup PA amplifiers are connected to a bridge circuit, which is connected to the RFout port and a switching switch, respectively.

[0022] In a further improvement, the main and backup intermediate frequency boards include a near-end unit and a far-end unit connected by optical fiber, with the first standard port and the second standard port located on the near-end unit side, and the transmitting antenna located on the far-end unit side.

[0023] Further improvements include a first standard port operating at a frequency of 400MHz, with an uplink frequency of 403.2MHz to 404.2MHz and a downlink frequency of 413.2MHz to 414.2MHz.

[0024] Further improvements include a second standard port operating frequency of 450MHz, with an uplink frequency of 457MHz~459MHz and a downlink frequency of 457MHz~459MHz for the same frequency and 467MHz~469MHz for different frequencies.

[0025] One specific embodiment of this utility model consists of a near-end unit ( Figure 2 ) and remote machine ( Figure 3The system consists of two components. The near-end unit is capable of processing two signal formats. It employs two independent physical ports, allowing simultaneous input of both formats without interference. The near-end unit's Port1 and Port2 receive signals of format 1 and format 2 respectively. These signals are converted to digital signals by the intermediate frequency board's analog-to-digital converter (ADC) module, packaged and converted into serial data by the digital processing unit, and then transmitted to the far-end unit via optical fiber. The far-end unit receives the signals, converts them to analog signals by the intermediate frequency board's digital-to-analog converter (DAC) module, and amplifies both formats before sending them to the weak signal area.

[0026] The dual-mode DRTD digital broadband fiber optic repeater operates as follows:

[0027] System 1 (transmit f1, receive f2): Signal f1 enters the duplexer from Port1, then enters the main / backup intermediate frequency board for processing. The processed signal f1 is amplified by the main / backup PA and transmitted to the antenna from the RFout port.

[0028] During reception, the antenna receives signal f2, which is amplified by LNA1 with low noise, then processed by the main / backup intermediate frequency board, transmitted through optical fiber to the near-end unit, and output from Port1 via a duplexer.

[0029] Mode 2 (transmit f3, receive f4): Signal f3 enters the circulator from Port2, then enters the main / backup IF board for processing. The processed signal f3 is amplified by the main / backup PA and transmitted to the antenna from the RFout port.

[0030] During reception, the antenna receives signal f4, which is then amplified by LNA2 with low noise after passing through a switching switch. It is then processed by the main / backup intermediate frequency board, transmitted through optical fiber to the near-end unit, and output from Port2 via a circulator as f4.

[0031] A dual-mode DRTD digital broadband fiber optic repeater configures the operating frequency band via software: when mode 1 and mode 2 need to work simultaneously, the channel switches of the two modes are set to the on state, thereby achieving the purpose of dual-mode operation; when mode 1 or mode 2 needs to work alone, the corresponding switches are set to the on state respectively, so as to achieve individual control of the required mode.

[0032] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. In particular, for the device embodiments, the above descriptions are merely preferred embodiments of this utility model. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments. The above descriptions are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model, without departing from the principle of this utility model, should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A dual-mode DRTD digital broadband fiber optic repeater, characterized in that: The system includes a first standard port and a second standard port. Each standard port includes a transmitter and a receiver. The transmitter of the first standard port is connected to the transmitting antenna in sequence through a duplexer, a main and backup intermediate frequency board, a main and backup power amplifier (PA) and an RFout port. The transmitting antenna is connected back to the receiver of the first standard port in sequence through a first low-noise amplifier (LNA), a main and backup intermediate frequency board, and a duplexer. The transmitter of the second standard port is connected to the transmitting antenna in sequence through a circulator, a main and backup intermediate frequency board, a main and backup power amplifier (PA) and an RFout port. The transmitting antenna is connected to the receiver of the second standard port in sequence through a switch, a second low-noise amplifier (LNA), a main and backup intermediate frequency board, and a circulator.

2. The dual-mode DRTD digital broadband fiber optic repeater according to claim 1, characterized in that: The main and backup PA amplifiers are connected to a bridge circuit, which is connected to the RFout port and a switching switch, respectively.

3. The dual-mode DRTD digital broadband fiber optic repeater according to claim 1, characterized in that: The primary and backup intermediate frequency boards include a near-end unit and a far-end unit connected by optical fiber. The first standard port and the second standard port are located on the near-end unit side, and the transmitting antenna is located on the far-end unit side.

4. The dual-mode DRTD digital broadband fiber optic repeater according to claim 1, characterized in that: The first standard port operates at a frequency of 400MHz, with an uplink frequency of 403.2MHz to 404.2MHz and a downlink frequency of 413.2MHz to 414.2MHz.

5. The dual-mode DRTD digital broadband fiber optic repeater according to claim 1, characterized in that: The second standard port operates at a frequency of 450MHz, with the uplink frequency being 457MHz~459MHz and the downlink frequency being 457MHz~459MHz for the same frequency and 467MHz~469MHz for different frequencies.

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