Position coding and time code decoding integrated device

Abstract

The utility model discloses a position encoding and time code decoding integrated device, and belongs to the technical field of shaft angle encoders. The device comprises position coding and time code decoding, and the position coding and the time code decoding are integrated in a sealed case. A printed circuit board, an excitation power supply module and a direct-current power supply module are mounted in the sealed case; the excitation power supply module is connected with the printed circuit board and provides an excitation power supply for the printed circuit board and the external dual-channel rotary transformer; the direct-current power supply module is connected with an external alternating-current power supply and the excitation power supply module through corresponding connectors; the direct-current power supply module is connected with the printed circuit board through a connector, provides a required direct-current power supply for the printed circuit board, and has the characteristics of low cost, high integration level, high real-time performance, strong anti-interference capability, capability of realizing digital remote control and the like.

Description

Technical Field

[0001] The utility model belongs to the field of shaft angle encoders, is applied to aviation and aerospace measurement and control systems, and discloses an integrated device for position encoding and time code decoding. Background Art

[0002] Servo systems that implement closed-loop angular position control are used in aerospace measurement and control systems and industrial automatic control. The shaft angle encoder is an important detection element of the servo control system. The quality of the position and the level of accuracy directly affect the normal operation of the system. In the aerospace measurement and control system, the obtained antenna angle position needs to be accurately time-stamped, and the position is required to be encoded as data information of the whole millisecond time mark point (such as: whole 50ms, the time mark accuracy is required to be less than 0.1ms), so that the system can comprehensively compare the angle measurement data information of each station and complete the work of determining the target orbit.

[0003] Traditional shaft angle encoders collect antenna shaft angles and mark precise time stamps. Generally, the antenna control computer is equipped with a time card, a multi-channel data acquisition card, and a shaft angle encoding card to realize the acquisition of antenna shaft angle information. It is processed in two parts. One part collects the external input B code time code information, and the other part collects the antenna shaft angle position information. The interrupt mechanism based on Windows of the antenna control computer is used to complete the acquisition and decoding of B code information through the time card, and complete the acquisition and storage of position code. In actual engineering, each program software running on the antenna control computer will use Windows interrupts to varying degrees, which will inevitably affect the time stamp acquisition of angle measurement data, and occasionally there will be interruption loss or time stamp incomplete points. Although the angle measurement data is true, it does not meet the system time stamp accuracy index requirements. This technical solution has many equipment, high cost, poor integration, and low real-time performance. In addition, for the solution in which the antenna control unit collects shaft angle information through a multi-function data acquisition card, when the antenna is far away from the control computer, the shaft angle signal is an AC analog low voltage signal, and the position coding signal is easily interfered, resulting in abnormal operation of the equipment. At the same time, modern aviation and aerospace measurement and control systems currently require the use of long-distance fiber optic transmission modes to control antenna equipment, and current technical solutions are not suitable for remote control. Utility Model Content

[0004] The technical problem to be solved by the utility model is to avoid the shortcomings of the above-mentioned background technology, and specifically propose a device integrating position coding and time code decoding, which adopts an FPGA chip to realize antenna position coding and IRIG-B (DC) The signal acquisition and decoding function of the code has been used to build a new type of axis angle encoder that integrates axis angle encoding and time code decoding functions. It uses digital communication to report the antenna position code with precise time stamp. It has the characteristics of low cost, high integration, high real-time performance and strong anti-interference ability.

[0005] The utility model adopts the following technical solutions to achieve the above technical effects:

[0006] A position coding and time code decoding integrated device, comprising a position coding and a time code decoding, wherein the position coding and the time code decoding are integrated in a sealed chassis;

[0007] An interface socket I for connecting a dual-channel rotary transformer group is installed on the outer side of the sealed chassis; a power switch, a fan, a fuse, a grounding column and an interface socket II are installed on the other side, wherein the interface socket II is connected to a GPS antenna, an external timing device, and an AC 220V power supply, and outputs corresponding synchronization pulse signals, RS422 communication signals, CAN communication signals and high-speed CAN communication signals;

[0008] The sealed chassis is equipped with a printed circuit board, an excitation power supply module and a DC power supply module;

[0009] Wherein, the printed circuit board includes a time processing unit, a shaft angle data acquisition unit and a time scale processing and data communication unit, wherein the time processing unit is connected to an external GPS antenna and a time system device through an interface connector I, the shaft angle data acquisition unit is connected to a dual-channel sleeve shaft rotary transformer through an interface connector II, and the time scale processing and data communication unit is connected to the time processing unit and the shaft angle data acquisition unit through a parallel interface;

[0010] The excitation power supply module is connected to the printed circuit board and provides excitation power to the printed circuit board and the external dual-channel rotary transformer;

[0011] The DC power supply module is connected to the external AC power supply and the excitation power supply module through corresponding connectors; the DC power supply module is connected to the printed circuit board through a connector to provide the required DC power to the printed circuit board.

[0012] Furthermore, the time processing unit includes a GPS receiving module, a selection module, a 485 serial port receiving module and a time information generating module;

[0013] The GPS receiving module is connected to the time information generating module and the external GPS antenna respectively, and is used to forward the time information data of the GPS antenna to the time information generating module;

[0014] The input end of the selection module is connected to the external time system and the local time system, and the output end is connected to the time information generation module through the 485 serial port receiving module;

[0015] The time information generation module is connected to the shaft angle data acquisition module to collect time pulse information.

[0016] Further, the axis angle data acquisition unit includes an axis angle data acquisition module, an azimuth dual-channel RDC module and an elevation dual-channel RDC module;

[0017] The two output ends of the dual-channel rotary transformer group are connected to the shaft angle data acquisition module through the azimuth dual-channel RDC module and the pitch dual-channel RDC module respectively;

[0018] The azimuth dual-channel RDC module, the elevation dual-channel RDC module and the dual-channel rotary transformer group are all connected to the excitation power supply module.

[0019] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0020] The utility model integrates the position coding and time code decoding device, adopts an FPGA chip to realize the antenna position coding and IRIG-B (DC ) code signal acquisition and decoding function, a new type of shaft angle encoder integrating shaft angle encoding and time code decoding functions is constructed, which uses digital communication to report the antenna position code with precise time mark, with low cost, high integration, high real-time performance, strong anti-interference ability, and can realize digital remote control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model corresponds to overall Structural diagram.

[0022] Figure 2 It is a schematic diagram of the corresponding side structure of the utility model.

[0023] Figure 3 It is a schematic top view of the structure corresponding to the present utility model.

[0024] Figure 4 It is a schematic side view of the structure corresponding to the present utility model.

[0025] Figure 5 It is a schematic diagram of the corresponding composition principle of the utility model.

[0026] Figure 6 This is a schematic diagram of the composition principle of the time processing unit corresponding to the present utility model.

[0027] Figure 7 The figure is a schematic diagram of the composition principle of the shaft angle data acquisition unit corresponding to the utility model.

[0028] Figure 8 It is a schematic diagram of the composition principle of the time scale processing and data communication unit corresponding to the present utility model.

[0029] Fig. 9 The figure is a schematic diagram of the composition principle of the dual-channel rotary transformer group corresponding to the utility model.

[0030] In the figure: 1 - sealed chassis; 2 - power switch; 3 - grounding post; 4 - fan; 5 - interface socket; 6 - excitation power supply; 7 - DC power supply; 8 - printed circuit board; 81 - time processing unit; 82 - shaft angle data acquisition unit; 83 - time stamp processing and data communication unit. DETAILED DESCRIPTION

[0031] Below, the utility model is further described in conjunction with the accompanying drawings.

[0032] The present embodiment provides a device integrating position coding and time code decoding, which is applied to aviation and aerospace measurement and control systems. The device of the utility model integrates position coding and time code decoding in a sealed chassis; an interface socket is installed on one side of the sealed chassis, which is connected to a dual-channel rotary transformer group, and a power switch, a fan, a fuse, a grounding post and an interface socket are installed on the other side, wherein the interface socket is connected to a GPS antenna, an external timing device, and an AC 220V power supply, and can output synchronous pulse signals, RS422 communication signals, CAN communication signals and high-speed CAN communication signals; a printed circuit board, an excitation power supply module and a DC power supply module are installed inside the sealed chassis; the printed circuit The road board includes a time processing unit, a shaft angle data acquisition unit and a time scale processing and data communication unit. The time processing unit is connected to an external GPS antenna and a time system device through an interface connector, the shaft angle data acquisition unit is connected to a dual-channel sleeve shaft rotating transformer through an interface connector, and the time scale processing and data communication unit is connected to the time processing unit and the shaft angle data acquisition unit through a parallel interface; the excitation power supply module is connected to a printed circuit board to provide an excitation power supply for the printed circuit board and an external dual-channel rotating transformer; the DC power supply module is connected to an external AC power supply and an excitation power supply through a connector; the DC power supply module is connected to a printed circuit board through a connector to provide the required DC power supply for the printed circuit board.

[0033] Furthermore, the position coding and time code decoding integrated device is characterized in that, except for the GPS interface which adopts BNC, the interface sockets on both sides of the sealed chassis adopt aviation plugs for the other signal interfaces.

[0034] Furthermore, the position coding and time code decoding integrated device is characterized in that the printed circuit board is welded with an FPGA and two MCU chips. The FPGA chip uses the STM32F105RBT6 chip from STMicroelectronics; The MCU chip uses Actel's A3P250_PQFP208_4 chip.

[0035] Furthermore, the position coding and time code decoding integrated device is characterized in that the time stamp processing and data communication unit is controlled by dual MCUs, MCU1 mainly completes low-speed CAN data processing and dual-channel RS422 data processing, and MCU2 mainly completes high-speed CAN data processing.

[0036] Furthermore, the position coding and time code decoding integrated device is characterized in that the shaft angle data acquisition unit can collect up to three dual-channel sleeve shaft rotary transformer analog data.

[0037] Depend on Figure 1 As shown, the utility model integrates the position coding and time code decoding into an integrated device, which is applied to aviation and aerospace measurement and control systems. The characteristic is that the utility model integrates the position coding and time code decoding into a sealed chassis 1, one side of the sealed chassis 1 is equipped with an interface socket, which is connected to the dual-channel rotary transformer group, and the other side is equipped with a power switch 2, a grounding column 3, a fan 4, and an interface socket 5, wherein the interface socket is connected to the GPS antenna, an external timing equipment, and an AC 220V power supply, and can output synchronous pulse signals, RS422 communication signals, CAN communication signals, and high-speed CAN communication signals; an excitation power supply module 6, a DC power supply module 7, and a printed circuit board 8 are installed inside the sealed chassis; the printed circuit board 8 includes The time processing unit 81, the shaft angle data acquisition unit 82 and the time scale processing and data communication unit 83, the time processing unit 81 is connected to the external GPS antenna and the time system equipment through the interface connector, the shaft angle data acquisition unit 82 is connected to the dual-channel sleeve shaft rotating transformer through the interface connector, and the time scale processing and data communication unit 83 is connected to the time processing unit 81 and the shaft angle data acquisition unit 82 through the parallel interface; the excitation power supply module 7 is connected to the printed circuit board 8 to provide the excitation power supply for the printed circuit board and the external dual-channel rotating transformer; the DC power supply module 7 is connected to the external AC power supply and the excitation power supply through the connector; the DC power supply module 7 is connected to the printed circuit board 8 through the connector to provide the required DC power supply for the printed circuit board.

[0038] Furthermore, the position coding and time code decoding integrated device is characterized in that, except for the GPS antenna interface which adopts BNC, the interface sockets on both sides of the sealed chassis 1 adopt aviation connectors for the other signal interfaces.

[0039] Furthermore, the position coding and time code decoding integrated device is characterized in that the printed circuit board 8 is welded with an FPGA and two MCU chips. The FPGA chip uses the STM32F105RBT6 chip from STMicroelectronics; The MCU chip uses Actel's A3P250_PQFP208_4 chip.

[0040] Furthermore, the integrated device for position coding and time code decoding is characterized in that the time processing unit 81 can receive the time information data of the IGRG-B (DC) code received by the GPS antenna or external timing equipment, and generate the required time information data, as well as the time pulse information required for collecting the RDC signal.

[0041] Furthermore, the position coding and time code decoding integrated device is characterized in that the shaft angle data acquisition unit 82 can collect up to three dual-channel sleeve shaft rotary transformer analog data.

[0042] Furthermore, the integrated device of position coding and time code decoding is characterized in that the time stamp processing and data communication unit 83 is controlled by dual MCUs, MCU1 mainly completes low-speed CAN data processing and dual-channel RS422 data processing, and MCU2 mainly completes high-speed CAN data processing.

[0043] Furthermore, the position coding and time code decoding integrated device is characterized in that the time scale processing and data communication unit 83 uses FPGA to parse the time information of the IGRB-B (DC) code, and generates 1PPS, 20PPS, 40PPS, 80PPS synchronization pulse signals, angle acquisition trigger signals, and external interrupt signals. When the external time system signal is interrupted, it will automatically switch to the internal time system and continue timing; when the external time system signal is restored, it will automatically switch to the external time system and update to the time information provided by the external time system.

[0044] Furthermore, the position coding and time code decoding integrated device is characterized in that the FPGA in the time scale processing and data communication unit 83 Adopts STMicroelectronics STM32F105RBT6 chip.

[0045] Furthermore, the integrated device of position coding and time code decoding is characterized in that the input power supply of the excitation power supply module 6 is DC 24V, the output is 26V, and the frequency is 400Hz.

[0046] Furthermore, the integrated device of position coding and time code decoding is characterized in that the DC power supply module 7 can provide +5V, +12V, -12V, +24V outputs.

[0047] Furthermore, the integrated device of position coding and time code decoding is characterized in that the time stamp processing and data communication unit 83 can realize the power detection and fault alarm functions of the power output 26V / 400Hz of the excitation power module 6 and the power output +5V, +12V, -12V, +24V of the DC power module 7.

[0048] Furthermore, the position coding and time code decoding integrated device is characterized in that the CAN communication interface circuit of the time stamp processing and data communication unit 83 is equipped with a 120 ohm matching resistor.

[0049] Furthermore, the position coding and time code decoding integrated device is characterized in that the RS422 communication and CAN communication interfaces of the time stamp processing and data communication unit 83 are isolated by optical coupling.

[0050] Working principle of the integrated device for position coding and time code decoding:

[0051] The integrated device for position coding and time code decoding is mainly composed of a time processing unit, a shaft angle data acquisition unit, and a time stamp processing and data communication unit, etc., to realize antenna angle position coding and time code decoding. First, the time processing unit obtains time information data from an external GPS antenna or time system equipment, and generates the required time information data through data processing, as well as the time pulse information required for collecting RDC signals; after receiving the time synchronization pulse signal information, the shaft angle data acquisition unit collects the shaft angle signal data of the dual-channel rotary transformer group through a parallel bus, and at the same time, the two MCUs of the time stamp processing and data communication unit collect time information and shaft angle data information through a parallel data interface, and package the time information and the collected shaft angle data into a data frame, and mark each angle data with a precise time stamp, and then send it to the dual CAN port and the dual RS422 port to realize RS-422 serial communication and CAN communication with external devices.

[0052] Working principle of time processing unit:

[0053] The time processing unit obtains time information data from an external GPS antenna or time system device, generates the required time information data through data processing, and collects the time pulse information required for the RDC signal. At the same time, when the GPS or IRIG-B signal is lost, it automatically enters the timekeeping mode. After detecting the synchronization recovery, it can resume using the time information extracted from the GPS signal or IRIG-B data. At the same time, a high-precision clock is used to divide the second pulse signal and generate millisecond data, and a high-precision clock is used to divide the second pulse signal to generate the RDC signal collection pulse.

[0054] Working principle of the shaft angle data acquisition unit:

[0055] The axis angle data acquisition unit collects antenna axis angle data through the RDC module. The RDC module control signal is generated by FPGA. During the acquisition, the dual-channel RDC modules collect data simultaneously, first collecting the A channel of the RDC module, and then collecting the B channel of the RDC module. The acquisition interval between the A channel and the B channel is very short to maximize the synchronization of data acquisition.

[0056] Working principle of time stamp processing and data communication unit:

[0057] The two MCUs of the time stamp processing and data communication unit collect time information and shaft angle data information through the parallel data interface, and pack the time information and the collected shaft angle data into a data frame, and respond to the read operation of MCU-1 and MCU-2 at the same time, and return the time information and shaft angle data; then after receiving the external synchronization pulse signal through the signal isolation module, the two MCUs read the time information, shaft angle data, partition information, power supply detection information, and pack the data into frames and send them to the dual CAN port and dual RS422 port to realize RS422 serial communication and CAN communication with external devices; the MCU parses the instructions received from the CAN port and RS422 port, and performs corresponding operations; the unit can store relevant parameters in the EEPROM.

[0058] It should be understood that the above description of the specific implementation methods of this patent is only an exemplary description listed to facilitate ordinary technicians in the field to understand the patent scheme, and does not imply that the scope of protection of this patent is limited to these individual examples. Ordinary technicians in this field can fully understand the technical scheme of this patent and, without any creative work, obtain more specific implementation methods by combining technical features, replacing some technical features, adding more technical features, etc. to the examples listed in this patent. All these specific implementation methods are within the scope of the claims of this patent. Therefore, these new specific implementation methods should also be within the scope of protection of this patent.

[0059] In addition, for the purpose of simplifying the description, this patent may not list some common specific implementation schemes, which are naturally conceivable to ordinary technicians in this field after understanding the technical solution of this patent. Obviously, these solutions should also be included in the scope of protection of this patent.

Claims

1. A device integrating position coding and time code decoding, characterized in that: Includes position coding and time code decoding, and the position coding and time code decoding are integrated in a sealed chassis; An interface socket I for connecting a dual-channel rotary transformer group is installed on the outer side of the sealed chassis; The other side is equipped with a power switch, a fan, a fuse, a grounding post and an interface socket II. The interface socket II is connected to the GPS antenna, an external timing device, and an AC 220V power supply, and outputs corresponding synchronization pulse signals, RS422 communication signals, CAN communication signals, and high-speed CAN communication signals. The sealed chassis is equipped with a printed circuit board, an excitation power supply module and a DC power supply module; Wherein, the printed circuit board includes a time processing unit, a shaft angle data acquisition unit and a time scale processing and data communication unit, wherein the time processing unit is connected to an external GPS antenna and a time system device through an interface connector I, the shaft angle data acquisition unit is connected to a dual-channel sleeve shaft rotary transformer through an interface connector II, and the time scale processing and data communication unit is connected to the time processing unit and the shaft angle data acquisition unit through a parallel interface; The excitation power supply module is connected to the printed circuit board and provides excitation power to the printed circuit board and the external dual-channel rotary transformer; The DC power supply module is connected to the external AC power supply and the excitation power supply module through corresponding connectors; the DC power supply module is connected to the printed circuit board through a connector to provide the required DC power to the printed circuit board; The time processing unit obtains time information data from an external GPS antenna or time synchronization device, and generates the required time information data and the time pulse information required for collecting RDC signals through data processing; after receiving the time synchronization pulse signal information, the shaft angle data acquisition unit collects the shaft angle signal data of the dual-channel rotary transformer group through the parallel bus. At the same time, the two MCUs of the time stamp processing and data communication unit collect time information and shaft angle data information through the parallel data interface, and package the time information and the collected shaft angle data into a data frame, and mark each angle data with a precise time stamp, and then send it to the dual CAN port and the dual RS422 port to realize RS-422 serial communication and CAN communication with external devices.

2. The integrated device for position coding and time code decoding according to claim 1, characterized in that: The time processing unit includes a GPS receiving module, a selection module, a 485 serial port receiving module and a time information generating module; The GPS receiving module is connected to the time information generating module and the external GPS antenna respectively, and is used to forward the time information data of the GPS antenna to the time information generating module; The input end of the selection module is connected to the external time system and the local time system, and the output end is connected to the time information generation module through the 485 serial port receiving module; The time information generation module is connected to the shaft angle data acquisition module to collect time pulse information; The time processing unit obtains time information data from an external GPS antenna or time system device, and generates the required time information data and the time pulse information required for collecting RDC signals through data processing. At the same time, when the GPS or IRIG-B signal is lost, it automatically enters the timekeeping mode. After detecting that the synchronization is restored, it can resume using the time information extracted from the GPS signal or IRIG-B data; at the same time, a high-precision clock is used to divide the second pulse signal and generate millisecond data, and a high-precision clock is used to divide the second pulse signal to generate RDC signal collection pulses.

3. The integrated device for position coding and time code decoding according to claim 1, characterized in that: The axis angle data acquisition unit includes an axis angle data acquisition module, an azimuth dual-channel RDC module and an elevation dual-channel RDC module; The two output ends of the dual-channel rotary transformer group are connected to the shaft angle data acquisition module through the azimuth dual-channel RDC module and the pitch dual-channel RDC module respectively; The azimuth dual-channel RDC module, the elevation dual-channel RDC module and the dual-channel rotary transformer group are all connected to the excitation power supply module; The axis angle data acquisition unit collects antenna axis angle data through the RDC module, and the RDC module control signal is generated by FPGA. During the acquisition, the dual-channel RDC modules collect data simultaneously, first collecting the A channel of the RDC module, and then collecting the B channel of the RDC module. The acquisition interval between the A channel and the B channel is very short to maximize the synchronization of data acquisition.

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