An arrow-ground IO signal transmission system and method based on optical fiber medium

Abstract

The present invention discloses a ground-to-rocket IO signal transmission system and method based on optical fiber medium. The on-rocket system terminal device includes a signal redundancy processing module and three signal conversion and processing modules; the ground system terminal is symmetrically equipped with three signal conversion and processing modules and an IO signal redundancy processing module; the on-rocket system terminal and the ground system terminal perform signal transmission through three optical fiber cables. The present invention realizes the fiberization of the ground-to-rocket IO signal transmission, and at the same time effectively improves the reliability and real-time performance of signal transmission by using a unique three-channel hardware redundancy processing method. Through the conversion and processing of the ground-to-rocket IO signal, the free configuration of the number of IO interfaces is realized, and the number of connector cores is effectively reduced; by adopting optical fiber medium transmission, the light weight of the cable is realized, and the electromagnetic compatibility performance of the cable is significantly enhanced; through the modular design concept, the convenient scheme configuration and upgrade and transformation are realized.

Description

Technical Field

[0001] The present invention relates to a ground-to-rocket signal transmission system and method, in particular to a ground-to-rocket IO signal transmission system and method based on optical fiber medium. Background Art

[0002] The ground-to-rocket interfaces of traditional launch vehicles mainly include acquisition interfaces, communication, and power supply interfaces for IO switch quantities and analog quantities. The transmission method is to directly transmit electrical signals using copper medium cables and connectors. Among them, the IO switch quantity interface is mainly used to monitor the important signal states on the rocket and control the actions of key signals on the rocket, that is, mainly including power-on control of on-rocket equipment, battery activation, opening / closing safety bolts, launch command, and ignition actions. It occupies a large number of signal points of the ground-to-rocket interface, which directly leads to too many cores of the ground-to-rocket separation connector and a decrease in reliability. At the same time, because copper medium is used for transmission, the corresponding ground-to-rocket cable is also relatively heavy, and it is impossible to achieve backup redundancy for each channel. More importantly, since it transmits electrical signals, it cannot ensure reliable transmission in a strong electromagnetic environment.

[0003] Currently, with the development of technology, signal transmission based on optical fiber medium has gradually begun to be used in the aerospace field (such as Chinese Patent Document CN201220408936, a communication system for ground testing, launching, and controlling a launch vehicle). It mainly has the advantages of light volume, strong anti-interference ability, high transmission bandwidth, etc., and has currently been widely used in signal transmission in the communication field. However, the currently commonly used optical fiber transmission method also has disadvantages such as non-redundant optical fiber transmission links or relying on application layer software redundancy, which will cause problems such as excessive burden on the application layer, poor reliability, and poor real-time performance. Therefore, if the IO switch quantity of the ground-to-rocket interface can be transmitted using optical fiber medium, and at the same time, through the hardware redundancy processing method of the underlying transmission link, the current existing deficiencies can be effectively solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a ground-to-rocket IO signal transmission system and method based on optical fiber medium, to solve many deficiencies of using traditional copper medium or optical fiber medium as the carrier, that is, too many cores and low reliability of traditional ground-to-rocket connectors, heavy copper medium transmission cables, weak redundancy ability of transmission channels, and poor electromagnetic compatibility of ground-to-rocket cables. At the same time, the single-channel optical fiber transmission method that currently generally relies on application layer software processing is improved. The present invention adopts three-channel hardware redundancy and combines underlying embedded software, without relying on application layer redundancy processing, and has high reliability and real-time performance;

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] An arrow-ground IO signal transmission system based on optical fiber medium, including an on-arrow system end, a ground system end, and arrow-ground optical fiber cables. Among them, the on-arrow system end includes an IO signal redundancy processing module and three signal conversion processing modules. The ground system end is symmetrically equipped with three signal conversion processing modules and an IO signal redundancy processing module. The on-arrow system end and the ground system end perform signal transmission through three arrow-ground optical fiber cables;

[0007] Furthermore, the IO signal redundancy processing module includes a signal acquisition module and a signal voting and driving module. The signal conversion processing module includes a signal processing module, an electro-optical or opto-electronic conversion module, and a power supply module;

[0008] The specific steps of an arrow-ground IO signal transmission method based on optical fiber medium are as follows:

[0009] The first step: Build an arrow-ground IO signal transmission system based on optical fiber medium

[0010] The arrow-ground IO signal transmission system based on optical fiber medium has: a signal conversion processing module, a transmission cable, and an IO signal redundancy processing module;

[0011] The functions of the signal conversion processing module are: to realize the encoding and decoding of parallel signals and serial signals; to realize the electro-optical or opto-electronic conversion of serial signals.

[0012] The functions of the IO signal redundancy processing module are: as the core of the three-channel hardware redundancy processing method, to perform redundancy processing on three signal conversion processing modules and three transmission cables, and to convert the signals input by the external system into TTL signals. At the same time, a two-out-of-three voting process is performed on the output signals of the single-chip microcomputer to ensure that when any signal processing and transmission link fails, the entire arrow-ground IO signal transmission is normal;

[0013] Set the application scenarios of the arrow-ground IO signal transmission system: According to the system design principle, the application scenarios of each device in this solution are specifically set as follows: One IO signal redundancy processing module is set at the on-arrow system end, connected to the IO signal interface of the on-arrow system end, and at the same time connected to three signal conversion processing modules. Each signal conversion processing module is then connected to the ground system end through an arrow-ground optical fiber cable. The ground system end is the same as the on-arrow system end, with one IO signal redundancy processing module, connected to the IO signal interface of the ground system end, and at the same time connected to three signal conversion processing modules. Each signal conversion processing module is respectively connected to the corresponding arrow-ground optical fiber cable;

[0014] The second step: Simulate the working process of the arrow-ground IO signal transmission system

[0015] According to the system application scenario, the working process of simulating the transmission of the digital output signals from the on-board system to the ground system is as follows: The on-board system transmits all the digital output signals to the IO signal redundancy processing module of the on-board system. After isolation and conversion, they are simultaneously output to three signal conversion and processing modules. After being encoded and electro-optically converted by the single-chip microcomputer in the signal conversion and processing module, they are respectively transmitted to the three signal conversion and processing modules at the ground end through three optical fiber cables. After each signal conversion and processing module performs corresponding opto-electronic conversion and decoding processing, they are respectively transmitted to the IO signal redundancy processing module. After conversion, they drive the solid-state relay, and after the output contacts are voted, they are output to the digital input end of the ground system, thus realizing the function of outputting the digital signals from the on-board system to the ground end;

[0016] The process of transmitting the digital output signals from the ground system to the on-board system is the same as the above process, except that the transmission direction is opposite, so it will not be elaborated here;

[0017] Compared with the prior art, the present invention realizes the fiberization of the space-ground IO signal transmission of the launch vehicle. At the same time, compared with the current fiber optic transmission method that generally relies on application layer processing, the present invention adopts a three-channel hardware redundancy method that does not rely on the application layer, and has high reliability and real-time performance. Through the conversion and processing of the space-ground IO signals, the free configuration of the number of IO interfaces is realized, and the number of connector cores is effectively reduced; by adopting optical fiber medium transmission, the light weight of the cable is realized, and the electromagnetic interference resistance performance of the cable is significantly enhanced; through the modular design concept, convenient scheme configuration and upgrade transformation are realized. Brief Description of the Drawings

[0018] Figure 1 Schematic diagram of the principle of a space-ground IO signal transmission system and method based on optical fiber medium. Detailed Embodiment

[0019] The specific implementation scheme of the present invention takes the on-board system with N digital outputs and M digital inputs as an application example. The specific principle is shown in the appendix Figure 1 As shown, that is, the on-board system includes an IO signal redundancy processing module and three signal conversion and processing modules; the ground system equipment is symmetrically equipped with three signal conversion and processing modules and an IO signal redundancy processing module; the on-board system and the ground system transmit signals through three space-ground optical fiber cables;

[0020] The IO signal redundancy processing module is a module for pre-converting and redundantly processing the ground-to-air IO signals, including a signal acquisition module and a signal voting and driving module. The signal acquisition module mainly uses optocouplers to extract external output signals, converts them into standard TTL level signals, and then outputs them to the single-chip microcomputer chip. It can freely set the acquisition threshold voltage according to the optocoupler model and the electrical parameters of the matching circuit. The signal voting and driving module mainly enhances the driving ability of the three TTL level signals output by the three single-chip microcomputer chips through Darlington tubes, drives the corresponding three solid-state relays, and sends the load contacts of the solid-state relays to the input end of the external system after voting processing;

[0021] The signal conversion and processing module is used to implement signal encoding, decoding, and electro-optical and opto-electronic conversions of signals, including a signal processing module, an electro-optical or opto-electronic conversion module, and a power supply module. The signal processing module can select a domestic single-chip microcomputer as the core processing chip: encode the N-channel parallel TTL signals after optocoupler conversion into serial signals according to the HDLC protocol, and then output them to the electro-optical conversion module; decode the serial signals converted by the opto-electronic conversion module according to the protocol, and output them to the signal voting and driving module through the IO pins of the single-chip microcomputer. The electro-optical or opto-electronic conversion module realizes the conversion between serial electrical signals and optical signals. It can be implemented by using Avago's TOSA components and ROSA components and the peripheral configuration circuit. The central wavelength of its optical signal is 820nm, the maximum transmission distance is 2km, and the transmission rate is 0~5Mbps. The power supply module converts the power supply provided by the external system and provides the power required by each chip in the module. It realizes isolation from the external system power supply through the use of a DC / DC power isolation module and a filtering circuit.

Claims

1. A ground-to-arrow IO signal transmission system based on optical fiber medium, characterized in that, it adopts a three-channel hardware redundancy processing method, including an on-arrow system end, a ground system end and a ground-to-arrow optical fiber cable. Among them, the on-arrow system end includes an IO signal redundancy processing module and a signal conversion processing module. The ground system end is symmetrically equipped with a signal conversion processing module and an IO signal redundancy processing module. The on-arrow system end and the ground system end transmit signals through the ground-to-arrow optical fiber cable; One IO signal redundancy processing module is set at the on-arrow system end, connected to the IO signal interface of the on-arrow system end, and at the same time connected to three signal conversion processing modules. Each signal conversion processing module is then connected to the ground system end through the ground-to-arrow optical fiber cable; The ground system end is the same as the on-arrow system end, with one IO signal redundancy processing module set, connected to the IO signal interface of the ground system end, and at the same time connected to three signal conversion processing modules. Each signal conversion processing module is respectively connected to the corresponding ground-to-arrow optical fiber cable; The on-arrow system end transmits each switch output signal to the IO signal redundancy processing module of the on-arrow system end. After isolation conversion, it is simultaneously output to three signal conversion processing modules. After being encoded and electro-optically converted by the single-chip microcomputer in the signal conversion processing module, it is respectively transmitted to the three signal conversion processing modules of the ground system end through three ground-to-arrow optical fiber cables. After each signal conversion processing module performs corresponding opto-electric conversion and decoding processing, it is respectively transmitted to the IO signal redundancy processing module, and after conversion, it drives a solid-state relay, and after performing a vote processing on the output contacts, it is output to the switch input end of the ground system end, thereby realizing the output of the on-arrow system switch signal to the ground system end; The function of the IO signal redundancy processing module is: as the core of the three-channel hardware redundancy processing method, it redundantly processes three signal conversion processing modules and three ground-to-arrow optical fiber cables, converts the signals input by the external system into TTL signals, and at the same time performs a two-out-of-three vote processing on the output signals of the single-chip microcomputer to ensure that when any signal processing and transmission link fails, the entire ground-to-arrow IO signal transmission is normal.

2. A ground-to-arrow IO signal transmission system based on optical fiber medium according to claim 1, characterized in that the IO signal redundancy processing module includes a signal acquisition module and a signal voting and driving module, and the signal conversion processing module includes a signal processing module, an electro-optic or opto-electric conversion module and a power supply module.

3. A ground-to-arrow IO signal transmission method, applied to a ground-to-arrow IO signal transmission system according to any one of claims 1-2, adopting a three-channel hardware redundancy processing method, including an on-arrow system end, a ground system end and a ground-to-arrow optical fiber cable, wherein, The on-board system terminal includes an IO signal redundancy processing module and a signal conversion processing module. The ground system terminal is symmetrically equipped with a signal conversion processing module and an IO signal redundancy processing module. The on-board system terminal and the ground system terminal transmit signals through the on-board and ground optical fiber cables. The specific steps are as follows: Step 1: Build an on-board and ground IO signal transmission system based on optical fiber media. The on-board and ground IO signal transmission system based on optical fiber media includes: the signal conversion processing module, the on-board and ground optical fiber cable, and the IO signal redundancy processing module. One IO signal redundancy processing module is set at the on-board system terminal, connected to the IO signal interface of the on-board system terminal, and at the same time connected to three signal conversion processing modules. Each signal conversion processing module is then connected to the ground system terminal through the on-board and ground optical fiber cable. The ground system terminal is the same as the on-board system terminal, setting one IO signal redundancy processing module, connected to the IO signal interface of the ground system terminal, and at the same time connected to three signal conversion processing modules. Each signal conversion processing module is respectively connected to the corresponding on-board and ground optical fiber cable. Step 2: Simulate the working process of the on-board and ground IO signal transmission system. The on-board system terminal transmits each output signal of the switch quantity to the IO signal redundancy processing module of the on-board system terminal. After isolation conversion, it is output to three signal conversion processing modules at the same time. After being encoded and electro-optically converted by the single-chip microcomputer in the signal conversion processing module, it is respectively transmitted to the three signal conversion processing modules of the ground system terminal through three on-board and ground optical fiber cables. After each signal conversion processing module performs corresponding opto-electronic conversion and decoding processing, it is respectively transmitted to the IO signal redundancy processing module. After conversion, it drives the solid-state relay, and after the output contacts are voted, it is output to the switch quantity input terminal of the ground system terminal, so as to realize the output of the on-board system switch quantity signal to the ground system terminal. The function of the IO signal redundancy processing module is: as the core of the three-channel hardware redundancy processing method, it redundantly processes three signal conversion processing modules and three on-board and ground optical fiber cables, converts the signals input by the external system into TTL signals, and at the same time performs a two-out-of-three voting process on the output signals of the single-chip microcomputer to ensure that the entire on-board and ground IO signal transmission is normal when any signal processing and transmission link fails.

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