Satellite-borne interface expansion device and satellite

Abstract

The utility model relates to a spaceborne interface expansion device and a satellite, through designing a spaceborne interface expansion circuit structure composed of four kinds of cables and two kinds of resistors, a device for circuit communication expansion of a signal bus hardware interface and connection change of a hardware interface channel is formed, the resistors at different positions are selected through welding and dismounting, and the communication expansion of the signal bus hardware interface is realized. According to the utility model, a bus interface line expansion function is realized, and the bus interface line expansion device is suitable for interface expansion of a dual-channel dual-wire CAN bus, an RS485 communication interface bus and a multi-wire LVDS / RS422 communication interface, and meets and adapts to the requirements of communication bus manufacturing of a whole-satellite cable network of an existing commercial satellite. The device is easy to manufacture, the difficulty in manufacturing the whole satellite cable network and the difficulty in wiring layout design of the cable network are reduced, the cost performance and the reliability are high, and a reliable, firm, convenient, rapid and attractive electrical connection structure is provided for the whole satellite-borne electrical link cable network.

Description

Technical Field

[0001] This utility model belongs to the field of satellite cable network circuit design technology, and relates to a satellite-borne interface expansion device and a satellite. Background Technology

[0002] With the development of commercial satellites, the number of satellite payloads and the size and weight of satellites are gradually increasing. The number and types of satellite payload interfaces are also becoming more diverse, and the interconnecting cabling networks between payload interfaces are gradually forming complex mesh-like structures, increasing the difficulty of fabricating and routing the overall satellite cabling network. To effectively expand the satellite's cabling network interfaces and satellite interface bus, and to complete the interconnection between the satellite's core unit and payloads, as well as between payloads themselves, through cabling networks and interface lines, thus facilitating hardware connections for multiple communication interfaces / levels, there is an urgent need to design a satellite interface expansion hardware solution to this technical challenge. Utility Model Content

[0003] To address the problems existing in the aforementioned traditional technologies, this utility model proposes a satellite interface expansion device and a satellite, which can effectively realize the expansion of satellite cable network interfaces and satellite interface bus, meeting and adapting to the communication bus requirements of the whole satellite cable network manufacturing of commercial satellites.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0005] A spaceborne interface expansion device is provided, including a first cable, a second cable, a third cable, a fourth cable, a resistor r1, a resistor r2, a resistor r7, a resistor r8, a resistor r5, a resistor r6, a resistor R-1, and a resistor R-2;

[0006] The first cable is connected in series with the third cable via resistors r1, r7, and r6. The second cable is connected in series with the fourth cable via resistors r2, r5, and r8. The first cable is connected to the second cable via resistor R-1, and the second cable is connected to the fourth cable via resistor R-2. The first, second, third, and fourth cables are used to form a cable network for RS485 expansion port, CAN expansion port, RS422 expansion port, or LVDS expansion port. Resistors R-1 and R-2 are used for loop resistance matching.

[0007] On the other hand, a satellite is also provided, which uses the above-mentioned onboard interface expansion device as an interface expansion board. The onboard interface expansion device is mounted on a PCB board with rectangular connectors or a Molex series PCB board.

[0008] One of the above technical solutions has the following advantages and beneficial effects:

[0009] The aforementioned onboard interface expansion device and satellite, through the design of an onboard interface expansion circuit structure composed of four types of cables and two types of resistors, form a device for expanding the line connectivity of the signal bus hardware interface and changing the hardware interface channel connection. It supports the selection of different resistor positions through soldering and disassembly to realize the bus interface line expansion function. It is suitable for interface expansion of dual-channel two-wire CAN bus, RS485 communication interface bus, and multi-wire LVDS / RS422 communication interface, meeting and adapting to the communication bus requirements of existing commercial satellite whole-satellite cable network fabrication. The device is simple to manufacture, reducing the difficulty of fabricating the whole-satellite cable network and designing the cable network layout. It has high cost-effectiveness and reliability, providing a reliable, robust, convenient, fast, and aesthetically pleasing electrical connection structure for the entire onboard electrical link cable network. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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.

[0011] Figure 1 This is a schematic diagram of the circuit structure of a spaceborne interface expansion device in one embodiment;

[0012] Figure 2 This is a schematic diagram of the PCB application structure of a spaceborne interface expansion device in one embodiment;

[0013] Figure 3 This is a schematic diagram of the PCB application structure of the onboard interface expansion device in another embodiment. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present utility model.

[0015] It should be noted that, in this document, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this utility model. The presentation of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand that the embodiments described herein can be combined with other embodiments. The term "and / or" as used in the specification and appended claims of this utility model refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0016] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0017] In one embodiment, such as Figure 1 As shown, a spaceborne interface expansion device is provided, including a first cable AH_TX11+, a second cable AH_TX11-, a third cable BH_RX+, a fourth cable BH_RX-, resistors r1, r2, r7, r8, r5, r6, R-1, and R-2. The first cable AH_TX11+ is connected in series with the third cable BH_RX+ through resistors r1, r7, and r6. The second cable AH_TX11- is connected in series with the fourth cable BH_RX- through resistors r2, r5, and r8. The first cable AH_TX11+ is connected to the second cable through resistor R-1. The second cable, AH_TX11-, is connected to the fourth cable, BH_RX-, via resistor R-2. The first cable, AH_TX11+, the second cable, AH_TX11-, the third cable, BH_RX+, and the fourth cable, BH_RX-, form a cable network for RS485, CAN, RS422, or LVDS expansion ports. Resistors R-1 and R-2 are used for loop resistance matching.

[0018] It is understandable that, in order to meet and adapt to the requirements of existing commercial satellite cable networks for communication bus fabrication, the onboard interface expansion device (board) expands the bus interface lines by soldering and removing resistors at different locations. It is suitable for dual-channel, dual-wire CANA / CANB buses, RS485 communication interfaces, and multi-wire LVDS / RS422 communication interfaces (multi-master / multi-slave or single-master / multi-slave communication interfaces) with selectable resistors. The structural principle of the onboard interface expansion device is as follows: Figure 1As shown, for example, the PDCU (Power Distribution and Control Unit) acts as the master unit, while multiple slave units are connected to RS485 communication interfaces at various locations to monitor camera loads. These multiple RS485 communication interfaces connect to the camera's focusing mechanism drive module. Another example is the communication unit, which is the master unit with an RS422 communication interface, while the PDCU and the onboard intelligent unit act as slave units. In practical applications, the single-unit bus mounting method involves fabricating interface terminals corresponding to the cable network interface (the terminals should adhere to the principle of point-to-point connection, no cutting in the middle of the wire, and no one wire connecting multiple soldered wires). Soldering terminals are selected to meet the communication interface requirements. These terminals offer advantages such as on-orbit experience, reliability, robustness, and ease of installation and removal, facilitating debugging of the entire satellite and individual units, and supporting universal interface fabrication.

[0019] The aforementioned spaceborne interface expansion device, through a design using a circuit structure comprised of four types of cables and two types of resistors, forms a device for expanding the line connectivity of the signal bus hardware interface and changing the hardware interface channel connections. It supports the selection of different resistor positions through soldering and disassembly to achieve bus interface line expansion functionality. It is suitable for interface expansion of dual-channel, two-wire CAN bus, RS485 communication interface bus, and multi-wire LVDS / RS422 communication interface, meeting and adapting to the requirements of existing commercial satellite whole-satellite cable network construction for communication bus. The device is simple to manufacture, reducing the difficulty of fabricating the whole-satellite cable network and designing cable network routing layout. It offers high cost-effectiveness and reliability, providing a reliable, robust, convenient, fast, and aesthetically pleasing electrical connection structure for the entire electrical link cable network of the spaceborne system.

[0020] In one embodiment, there are at least two sets of third cables BH_RX+ and fourth cables BH_RX-. It can be understood that one third cable BH_RX+ and one fourth cable BH_RX- form a set, and in scenarios requiring a large number of expansion interfaces, the specific number can be more than two sets, such as... Figure 1 In BH_RXmn+ and BH_RXmn-, m and n are positive integers greater than 1, in order to more flexibly meet the requirements of satellite whole-satellite cable network for the construction of communication bus.

[0021] Furthermore, the expansion modes supported by the aforementioned spaceborne interface expansion device may include:

[0022] Optional, Extension Mode 1: When the first cable AH_TX11+ and the second cable AH_TX11- are used as RS485 extension ports, resistors r1~r8 are used for expansion by soldering, and multiple RS485 interfaces are soldered in parallel. Resistors R-1 and R-2 are used for 120Ω circuit matching.

[0023] Optional, Extended Mode 2: When the first cable AH_TX11+ / second cable AH_TX11- and the third cable BH_RX+ / fourth cable BH_RX- are used as CAN extension ports, resistors r1, r2, r7 and r8 are used to extend 2 CANA / CANB interfaces by soldering, resistors r5 and r6 are not involved in soldering, and resistors R-1 and R-2 are used for 120Ω circuit matching.

[0024] Optional, Extension Mode 3: When the first cable AH_TX11+ / second cable AH_TX11- and the third cable BH_RX+ / fourth cable BH_RX- are used as RS422 extension ports, resistors r5 and r6 are not involved in soldering, and resistors R-1 and R-2 are used for 120Ω circuit matching. In this mode, resistors r1, r2, r7, and r8 can be used to solder at least three RS422 extension interfaces. When wiring, it is important to note the master-slave connection (i.e., one master transmit TX is connected to several N slave receive RX on the bus, which can be used in scenarios where the entire satellite signal is transmitted to the master).

[0025] Optional, Extension Mode 4: When the first cable AH_TX11+ / second cable AH_TX11- and the third cable BH_RX+ / fourth cable BH_RX- are used as LVDS extension ports (one or more are possible, suitable for single-machine cold standby (or multiple standby)), resistors r1, r2, r7, r8, r5 and r6 are not involved in soldering, and resistors R-1 and R-2 are used for 100Ω resistor matching in the receiving circuit.

[0026] The specific welding connection method of each resistor in the above modes is to weld according to the inherent corresponding interface circuit structure, such as one board being used as a CAN interface board and another board being used as an RS485 board, etc.

[0027] In one embodiment, a satellite is also provided, wherein the satellite uses any of the above-mentioned onboard interface expansion devices as interface expansion boards, and the onboard interface expansion devices are mounted on a PCB board using rectangular connectors or a Molex series PCB board.

[0028] It is understood that in this embodiment, the satellite's overall core unit and payloads, as well as the payloads themselves, can be interconnected with the aforementioned onboard interface expansion device via a cable network. The onboard interface expansion device allows for the expansion of bus interface lines by selecting resistors at different locations through soldering and disassembly. This is suitable for expanding the interfaces of dual-channel, two-wire CAN bus, RS485 communication interface bus, and multi-wire LVDS / RS422 communication interfaces within the satellite. It meets and adapts to the communication bus requirements of various commercial satellites' overall cable network fabrication, reducing the difficulty of fabricating the overall satellite cable network and designing its routing layout. It offers high cost-effectiveness and reliability, providing a reliable, robust, convenient, fast, and aesthetically pleasing electrical connection structure for the entire onboard electrical link cable network.

[0029] In one embodiment, the PCB board uses differential pair wiring with grounding holes around the differential lines, and the resistors are positioned near both ends of the PCB board, with the connecting resistors positioned near the connectors.

[0030] It should be noted that PCB routing should use differential pair routing, following the characteristics and signal integrity of differential signal transmission lines. Differential traces should be routed with 100Ω impedance matching. 100Ω differential impedance is suitable for many existing high-speed communication standards (such as USB, Ethernet, RS422, RS485, etc.) and provides good anti-interference capability, reducing the impact of external noise on the signal. The manufacturing process for 100Ω differential impedance is relatively common and simple.

[0031] In some implementations, for example, the device layout and routing of PCB designs using rectangular connectors (such as the J30J series and J63A series connectors) are as follows: Figure 2 As shown, the circuit layout uses differential signals (line width and spacing designed for 100Ω impedance requirements). Grounding is achieved through vias around the differential lines. Connector placement and routing prioritize scalability. Resistors (R-1 and R-2) are positioned near both ends of the PCB, with connection resistors located close to the connectors. X1 to X4 represent the individual connectors. GND is the ground terminal.

[0032] In some implementations, such as PCB designs using the Molex series (e.g., 53047-0410), the device layout and routing are as follows: Figure 3 As shown, the circuitry uses differential signals (with line width and spacing designed for a 100Ω impedance requirement). Grounding is applied around the differential lines vias. Connector layout and routing prioritize scalability. Resistors are positioned near both ends of the board, and connecting resistors (r1, r2, r7, and r8) are placed near the connectors. X1, X2, X7, X8, X13, X14, X19, X20, and X21 represent the respective connectors.

[0033] By applying the appropriate matching impedance to the configuration interface bus loop (e.g., soldering a 120-ohm resistor to match the CAN communication bus interface), the signal's anti-interference capability is improved. By selecting and soldering resistors corresponding to the signal channel of the interface (e.g., soldering a 0-ohm resistor to the configuration hardware line), connection and interface switching with the corresponding signal channel interface can be achieved, fulfilling the requirements of two-wire and multi-wire interface bus lines.

[0034] As required, it can be used with J30J series miniature rectangular connectors and MOLEX53047 connectors, etc., taking into account the structural features of the connectors (such as barbs, locking elements, tail covers, and shielding mesh), to meet the overall requirements of commercial aerospace satellite wiring networks. The communication bus cable network can be configured with different signal interfaces and corresponding matching resistors according to the different signal buses transmitted through the cable network interface, providing protection for signal interface expansion and signal channels. At the same time, it can effectively avoid interference from external electromagnetic fields, improving signal integrity. The interface expansion device includes a PCB circuit board, bus signal matching or optional resistors, electrical cable network, and corresponding signal connectors. Depending on the different bus signal sources, it is divided into differential signal bus expansion units and single-ended signal bus expansion units. The PCB design has an outer grounded shielding layer to effectively prevent external electromagnetic field interference to the signal.

[0035] It is understood that the explanations of the various module circuits of the satellite can be found in the corresponding explanations of the various embodiments of the onboard interface expansion device, and will not be repeated here.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and all such modifications and improvements fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the appended claims.

Claims

1. A spaceborne interface expansion device, characterized in that, Including the first cable, the second cable, the third cable, the fourth cable, resistors r1, r2, r7, r8, r5, r6, R-1, and R-2; The first cable is connected in series with the third cable via resistors r1, r7, and r6. The second cable is connected in series with the fourth cable via resistors r2, r5, and r8. The first cable is connected to the second cable via resistor R-1, and the second cable is connected to the fourth cable via resistor R-2. The first cable, the second cable, the third cable, and the fourth cable are used to form a cable network for an RS485 expansion port, a CAN expansion port, an RS422 expansion port, or an LVDS expansion port. Resistors R-1 and R-2 are used for loop resistance matching.

2. The spaceborne interface expansion device according to claim 1, characterized in that, The third cable and the fourth cable are not less than two sets.

3. The spaceborne interface expansion device according to claim 1 or 2, characterized in that, When the first cable and the second cable are used as RS485 expansion ports, resistors r1 to r6 are used to expand multiple RS485 interfaces by soldering, and resistors R-1 and R-2 are used for loop 120Ω resistor matching.

4. The spaceborne interface expansion device according to claim 1 or 2, characterized in that, When the first cable / second cable and the third cable / fourth cable are used as CAN expansion ports, resistors r1, r2, r7 and r8 are used to expand two CAN interfaces by soldering. Resistors r5 and r6 are not involved in soldering. Resistors R-1 and R-2 are used for 120Ω circuit matching.

5. The spaceborne interface expansion device according to claim 1 or 2, characterized in that, When the first cable / second cable and the third cable / fourth cable are used as RS422 expansion ports, resistors r5 and r6 are not involved in soldering, and resistors R-1 and R-2 are used for 120Ω circuit matching.

6. The spaceborne interface expansion device according to claim 1 or 2, characterized in that, When the first cable / second cable and the third cable / fourth cable are used as LVDS expansion ports, resistors r1, r2, r7, r8, r5 and r6 are not involved in soldering. Resistors R-1 and R-2 are used for 100Ω resistor matching in the receiving circuit.

7. A satellite, characterized in that, The satellite employs an onboard interface expansion device as described in any one of claims 1 to 6 as an interface expansion board, and the onboard interface expansion device is mounted on a PCB board with rectangular connectors or a Molex series PCB board.

8. The satellite according to claim 7, characterized in that, The PCB board uses differential pair wiring with grounding holes around the differential lines. Resistors are positioned near both ends of the PCB board, and connecting resistors are positioned near the connectors.

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