Relay communication system and communication method based on 1553B bus

Abstract

The invention discloses a relay communication system and communication method based on a 1553B bus, and belongs to the technical field of carrier rocket internal communication. The relay communication system comprises a bus controller, a main line, a plurality of remote terminals and a plurality of branch lines; terminal resistors are arranged at two ends of the main line; the bus controller is electrically connected with the main line; the remote terminal is electrically connected with the main line through the branch line; the branch line is provided with a repeater capable of realizing regeneration of a standard 1553B signal; a signal conditioning module is assembled in the repeater; an electrical signal on the branch line is converted into digital logic through the receiving circuit, the digital logic is regenerated into a standard 1553B electrical signal after being corrected in the signal conditioning module, and then the standard signal is sent out through the sending circuit. The equipment cost can be effectively reduced, access system equipment is reduced, the reliability of the whole system is improved, manual operation and testing are simple, and the equipment only needs an electrical interface, is high in maintainability and low in environment requirement and can be used without maintenance for a long time.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a relay communication system and communication method based on the 1553B bus. Background Technology

[0002] Communication between various systems within a launch vehicle and between systems generally uses a 1553B bus. The main 1553B cable is typically no more than 100 meters long, and when branch lines use transformer indirect coupling, their length should not exceed 6 meters. When distributed testing is used, the length of the branch lines can exceed 6 meters. When the test length reaches tens of meters, the waveform of the branch lines will be distorted and cannot be identified, thus affecting the effective transmission of bus information.

[0003] Existing technologies typically employ photoelectric conversion relays to achieve stable long-distance signal transmission. This involves connecting a near-end photoelectric device to convert branch line signals close to the trunk into optical signals, transmitting them via fiber optic cable to a far-end photoelectric device, which then converts the optical signal back into an electrical signal. While this method can achieve long-distance transmission of 1553B branch line information, it is costly due to the need to modify branch cables, require two photoelectric devices, fiber optic cables, and conversion modules, and is cumbersome to install during testing, hindering efficient testing.

[0004] Therefore, it is necessary to provide a new technical solution to solve the above problems. Summary of the Invention

[0005] To address the aforementioned technical issues, this application provides a relay communication system and method based on the 1553B bus, which can effectively reduce equipment costs, decrease the number of devices connected to the system, and improve system reliability.

[0006] A relay communication system based on a 1553B bus includes: a bus controller, a main line, and several remote terminals and several branch lines; terminating resistors are provided at both ends of the main line; the bus controller is electrically connected to the main line; and the remote terminals are electrically connected to the main line through the branch lines. The branch line is equipped with a repeater capable of regenerating the standard 1553B signal; the repeater is equipped with a signal conditioning module; the electrical signal on the branch line is converted into digital logic by the receiving circuit, the digital logic is corrected in the signal conditioning module and regenerated into the standard 1553B electrical signal, and then the standard signal is sent out by the transmitting circuit.

[0007] Optionally, a plurality of bus couplers are provided on the main line; the bus controller is electrically connected to the main line through the bus couplers; the branch lines are electrically connected to the main line through the bus couplers.

[0008] Optionally, the branch line includes a first stub, a second stub, a third stub, and a branch main line; The two ends of the branch main line are provided with terminating resistors; the branch main line is provided with a first branch coupler and a second branch coupler. One end of the signal conditioning module is electrically connected to the bus coupler via a first stub wire, and the other end is electrically connected to the first branch coupler via a second stub wire. The remote terminal is electrically connected to the second branch coupler via a third short stub.

[0009] Optionally, the length of the branch main line is greater than 0 meters and less than 100 meters.

[0010] Optionally, the delay time of the signal through the repeater is controlled between 350ns and 700ns.

[0011] Optionally, the repeater is designed with the same impedance as the input impedance of the 1553B terminal equipment, and is greater than 3000Ω.

[0012] Optionally, the bus response time can be controlled between 4μs and 12μs.

[0013] Based on the same inventive concept, a relay communication method based on the 1553B bus is also provided, including: According to a preset schedule or event trigger, the bus controller initiates communication to transmit electrical signals from the main line to the branch line electrically connected to the target remote terminal; Electrical signals on the branch lines are converted into digital logic by the receiving circuit; The digital logic is corrected in the signal conditioning module on the branch line and regenerated into a standard 1553B electrical signal, which is then sent to the target remote terminal through the transmitting circuit. The target remote terminal receives the command and verifies its validity. If the command is valid, it executes the corresponding operation and returns a status word; if the command is invalid, it returns an error status word.

[0014] Compared with the prior art, this application has at least the following beneficial effects: The present invention adopts an alternative to the photoelectric conversion scheme, which eliminates the need for optical fiber and photoelectric conversion module, and eliminates the need to consider the environmental requirements of optical interface. It can effectively reduce equipment costs and reduce the number of connected system devices, which not only improves the overall system reliability, but also simplifies manual operation and testing. The device only requires an electrical interface, is highly maintainable, has low environmental requirements, and can be used for a long time without maintenance. Attached Figure Description

[0015] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a topology diagram of the relay communication system of the present invention; Figure 2 This is a schematic diagram of the branch line device in this invention.

[0016] The above figures include the following reference numerals: 1. Bus controller; 2. Main line; 3. Bus coupler; 4. First stub; 5. Signal conditioning module; 6. Repeater; 7. Second stub; 8. First branch coupler; 9. Branch main line; 10. Second branch coupler; 11. Third stub; 12. Remote terminal. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] like Figure 1 and Figure 2 As shown, a relay communication system based on a 1553B bus includes: a bus controller 1, a main line 2, and several remote terminals 12 and several branch lines; terminating resistors are provided at both ends of the main line 2; the bus controller 1 is electrically connected to the main line 2; and the remote terminals 12 are electrically connected to the main line 2 through the branch lines. A repeater 6 capable of regenerating the standard 1553B signal is installed on the branch line; the repeater 6 is equipped with a signal conditioning module 5; the electrical signal on the branch line is converted into digital logic by the receiving circuit, and the digital logic is corrected in the signal conditioning module 5 and regenerated into the standard 1553B electrical signal, which is then sent out through the transmitting circuit.

[0019] Specifically, the signal processing procedure is as follows: the electrical signal on the branch line is converted into digital logic by the receiving circuit. After the digital logic is corrected by the signal conditioning module, it is regenerated into a standard 1553B electrical signal. The standard signal is then sent out through the transmitting circuit. The correction process is provided by the internal clock circuit to ensure that the waveform of the regenerated signal has no distortion at the zero crossing point. Both bidirectional transmission and reception complete the relay function through this processing procedure.

[0020] It should be noted that this process relies on the hardware circuitry and protocol logic of the 1553B dedicated interface module to implement a closed-loop processing flow. The core is divided into three stages: signal reception and analog-to-digital conversion, digital logic signal conditioning and correction, and standard signal encoding and analog-to-digital regeneration. At the same time, it must match the Manchester encoding, differential transmission and other protocol characteristics of the 1553B.

[0021] Specifically, the 1553B differential Manchester analog signal transmitted on the branch line is isolated and suppressed by a transformer coupler before being sent to the receiving circuit. The AM26LS32 class differential receiver performs differential-to-single-ended conversion, and noise interference is filtered out using a ±200mV threshold decision. The signal is then input to the Manchester decoder, which extracts the mid-bit cycle transition edge to achieve 1MHz clock synchronization. Based on the transition direction, logic 0 / 1 is determined, restoring the original digital logic sequence containing the synchronization header, data bits, and parity bits. After the digital logic is sent to the signal conditioning module, timing jitter is corrected by PLL clock alignment, errors are eliminated by synchronization header format verification and parity checking, glitches are eliminated by digital filtering, and the 1553B protocol state machine verifies frame structure compliance, outputting clean digital logic. Finally, the encoded signal is reconstructed by the Manchester encoder, converted into a standard differential signal with a peak-to-peak value of 1.0-2.0V and an impedance of 100Ω by the AM26LS31 differential driver, and injected into the bus through a coupler to complete signal regeneration.

[0022] Furthermore, a number of bus couplers 3 are provided on the main line 2; the bus controller 1 is electrically connected to the main line 2 through the bus couplers 3; the branch lines are electrically connected to the main line 2 through the bus couplers 3.

[0023] Furthermore, the branch lines include the first stub 4, the second stub 7, the third stub 11, and the main branch line 9; The two ends of the branch main line 9 are provided with terminating resistors; the branch main line 9 is provided with a first branch coupler 8 and a second branch coupler 10; One end of the signal conditioning module 5 is electrically connected to the bus coupler 3 via the first stub 4, and the other end is electrically connected to the first branch coupler 8 via the second stub 7. The remote terminal 12 is electrically connected to the second branch coupler 10 via the third short line 11.

[0024] Furthermore, the length of branch main line 9 is greater than 0 meters and less than 100 meters.

[0025] Furthermore, the signal delay time in repeater 6 is controlled between 350ns and 700ns, which will not affect the bus information transmission. At the same time, the bus response time is controlled between 4μs and 12μs, giving the relay communication system low latency characteristics.

[0026] Furthermore, the design impedance of repeater 6 is consistent with the input impedance of the 1553B terminal equipment and is greater than 3000Ω.

[0027] Specifically, the repeater has a relatively small impact on the bus topology network because the repeater is designed with high impedance, and its design impedance is consistent with the input impedance of the 1553B terminal device, which is greater than 3000Ω.

[0028] Furthermore, in the relay communication system of the present invention, such as Figure 2 As shown, each branch line employs redundant circuitry. Specifically, each branch line includes a first stub 4, a signal conditioning module 5, a second stub 7, a first branch coupler 8, a branch main line 9, a second branch coupler 10, and a third stub 11, all connected in the same manner as described above to achieve electrical connection between the remote terminal 12 and the main line 2. This redundant circuitry scheme for each branch line satisfies the dual-channel 1553B dual-channel transmit / receive capability or redundant replacement requirements.

[0029] Furthermore, in the relay communication system of this invention, the external interface is a dedicated 1553B interface, and the device connector has clear markings to prevent mis-insertion.

[0030] Based on the same inventive concept, a relay communication method based on the 1553B bus is also provided, comprising the following steps: Step S1: According to a preset schedule or event trigger, the bus controller initiates communication to transmit electrical signals from the main line to the branch line electrically connected to the target remote terminal.

[0031] Step S2: The electrical signals on the branch line are converted into digital logic by the receiving circuit.

[0032] Step S3: The digital logic is corrected in the signal conditioning module on the branch line and regenerated into a standard 1553B electrical signal, which is then sent to the target remote terminal through the transmitting circuit.

[0033] Step S4: The target remote terminal receives the command and verifies its validity. If the command is valid, it executes the corresponding operation and returns a status word. If the command is invalid, it returns an error status word.

[0034] It should be noted that when a status word or an error status word is returned, the process is the reverse of the above communication scheme. That is, the target remote terminal initiates communication, sends a standard signal to the receiving circuit on the branch line, converts it into digital logic, and then regenerates the digital logic into a standard 1553B electrical signal after being corrected in the signal conditioning module on the branch line. The standard signal is then sent to the bus controller through the transmitting circuit, thus completing the entire communication process.

[0035] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0036] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A relay communication system based on the 1553B bus, characterized in that, include: The system includes a bus controller, a main line, several remote terminals, and several branch lines; terminating resistors are provided at both ends of the main line; the bus controller is electrically connected to the main line; and the remote terminals are electrically connected to the main line through the branch lines. The branch line is equipped with a repeater capable of regenerating the standard 1553B signal; the repeater is equipped with a signal conditioning module; the electrical signal on the branch line is converted into digital logic by the receiving circuit, the digital logic is corrected in the signal conditioning module and regenerated into the standard 1553B electrical signal, and then the standard signal is sent out by the transmitting circuit.

2. The relay communication system as described in claim 1, characterized in that, The main line is provided with several bus couplers; the bus controller is electrically connected to the main line through the bus couplers; the branch line is electrically connected to the main line through the bus couplers.

3. The relay communication system as described in claim 2, characterized in that, The branch line includes a first stub, a second stub, a third stub, and a main branch line; The two ends of the branch main line are provided with terminating resistors; the branch main line is provided with a first branch coupler and a second branch coupler. One end of the signal conditioning module is electrically connected to the bus coupler via a first stub wire, and the other end is electrically connected to the first branch coupler via a second stub wire. The remote terminal is electrically connected to the second branch coupler via a third short stub.

4. The relay communication system as described in claim 3, characterized in that, The length of the branch main line is greater than 0 meters and less than 100 meters.

5. The relay communication system according to any one of claims 1-4, characterized in that, The delay time of the signal through the repeater is controlled between 350ns and 700ns.

6. The relay communication system as described in claim 5, characterized in that, The repeater is designed with the same impedance as the input impedance of the 1553B terminal equipment, and is greater than 3000Ω.

7. The relay communication system as described in claim 6, characterized in that, The bus response time is controlled between 4μs and 12μs.

8. A relay communication method based on a 1553B bus, characterized in that, include: According to a preset schedule or event trigger, the bus controller initiates communication to transmit electrical signals from the main line to the branch line electrically connected to the target remote terminal; Electrical signals on the branch lines are converted into digital logic by the receiving circuit; The digital logic is corrected in the signal conditioning module on the branch line and regenerated into a standard 1553B electrical signal, which is then sent to the target remote terminal through the transmitting circuit. The target remote terminal receives the command and verifies its validity. If the command is valid, it executes the corresponding operation and returns a status word; if the command is invalid, it returns an error status word.

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