Time synchronization method for three-machine hot backup
A time synchronization and hot backup technology, applied in the direction of generating/distributing signals, etc., can solve the problems that affect the selection of the clock arbitration board when the flight, the system star time difference, the inconsistency of the comparison data, etc., and achieve the effect of eliminating the problem of computer cutting.
Active Publication Date: 2014-03-26
BEIJING INST OF CONTROL ENG
View PDF5 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, in the actual development process, the comparison data of the three machines often appears inconsistent. The reason is that the three machines use the timers of their respective CPU boards to calculate the star time of the control task, and the hardware of the three CPU boards inevitably has individual differences. , resulting in a difference in system star time when the three machines are running for a long time, which in turn leads to a difference in the comparison data, which affects the selection of the flight by the clock arbitration board, resulting in an unexpected shutdown operation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0013] In terms of system hardware configuration, a three-machine hot backup system consisting of three identical CPU boards (referred to as three machines) and one clock arbitration board is used. The arbitration board provides synchronization signals to the CPU board periodically (such as a period of 128 milliseconds), and the CPU board uses Its own clock signal. For example, when the CPU uses the TSC695F chip (see: TSC695F 32-bit SPARC Aerospace Special Processor User Manual) for related operations, the CPU board’s own clock can provide microseconds time signal.
[0014] First of all, it is clear that the three-machine system includes two kinds of time: one is the star time used by the application software to control calculation, which can be called GNC star time. The application software performs system control and calibration of each navigation sensor in the sub-system according to the GNC star time. The GNC satellite time is corrected according to the digital control tim...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a time synchronization method for three-machine hot backup oriented to system synchronization of spatial computer three-machine hot backup design. According to the method, first, respective hardware clock resolution ratios of three machines are refined, then, when a system operates, GNC sidereal time is obtained through a synchronization signal shared by the three machines and respective hardware clock information of the three machines, besides, a strategy is designed to control the three-machine small-size GNC sidereal time divergence problem caused by three-machine hardware difference, and thus it is guaranteed that the GNC sidereal time and digital pipe sidereal time are synchronous. According to the method, system hardware is not needed for providing high-accuracy clock information for the three machines, and dependence of application software on hardware environment is reduced. The method is adopted for a GNC system master control computer in the second phase of lunar exploration in China, and therefore three-machine sidereal time synchronous error is lower than 100 microseconds under the condition that no hardware is modified, and task needs are met.
Description
technical field [0001] The invention belongs to the field of aerospace computer control and relates to a time synchronization method for three-machine hot backup. Background technique [0002] The second phase of my country's lunar exploration project will achieve a soft landing on the lunar surface. The soft landing process on the lunar surface has the characteristics of short time and irreversibility, which requires the control system computer to have better fault tolerance and the ability to quickly isolate and deal with faults. Based on the above understanding, the main control computer in the GNC system (navigation, guidance and control system) of the second phase of my country's lunar exploration adopts the architecture of three-computer hot backup: the main control computer contains three identical CPU boards and one clock arbitration board: CPU The board realizes the hot backup of three machines, and the clock arbitration board synchronizes the task scheduling of the...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G06F1/12
Inventor 赵宇于萍杨巍梁俊程铭于洁胡洪凯吴坤陈尧王佳佳张洪华
Owner BEIJING INST OF CONTROL ENG