| 161B guidance radar is a universal guidance equipment used in radiophare tracking. It belongs to 1435 radar which is a precise measuring radar in our station. The digital system,which is a computer system for 161B guidance radar,is an important part of this radar. Its major task is to switch O D,to guide tracking,to record,display and print real-time tracking information,to carry out automatic detection of system faults,to receive standard outer time signal ,to produce simulative time,to monitor and process some variable from the radar system,etc.With the rapid development in national TT&C sector,the former digital system is showing more and more malfunctions and getting increasingly incompetent to the requirements of new TT&C missions. This task is to design and carry out a new digital system for 161B guidance radar. The presently advanced technology in hardware and software has been applied to this new digital system for 161B guidance radar.A Legend PHI with two function-expansion cards works as the main computer of the new digital system. Parallel-port card PCL-731 made by YanHua company is used for collecting time signals and status signals. The AD DA card designed by applying Protel 98 is used for collecting eight signals from rotary transformer and other analog signals while outputting real-time guiding signals.In order to meet the requirements of TT&C software for real time and reliability,we have developed successfully the device driver for parallel-port card PCL-731 and AD DA card through applying Microsoft DDK. The application program for the new digital system is based on Windows NT Workstation 4.0 operating system and it was developed under Visual C++ 5.0 applying OOA and OOD. We designed the interface for the application with support of Open GL.In order to meet new requirements of TT&C missions,we have devised some new algorithm for axis-angle codification,real time guidance of satellite tracing,data glossification and bad data culling,etc. Application of these methods have greatly strengthened the functions of the whole system,thus the measuring precision has been greatlyimproved.This system was put to use in March 2000.Its function and performance meet the TT&C requirements compeletly. All technology indexes meet design requirements.The system has such characteristic as reliability ,universal,real-time,scientific and friendly interface. The tracking data possesses high precision.This system is highly stable in hardware and perfect in software function. It is easy to use for its friendly user-interface. This system fulfilled its task perfectly in "JB-3" satellite unified practice. During the actual tracking mission launched September 2000,precise data was given. This system successfully accomplished its task in "JB-3" satellite tracking mission and will implement the following task. |
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