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APOD is a Nano satellite manufactured by DFH co., and carries dual-frequency GNSS (GPS/BD) receiver, density detector, SLR reflector and VLBI beacon. In this paper, the inflight performance of the MEMS GPS receiver has been assessed, including the multi-channel satellite ability and orbital accuracy. The average number of tracking GPS satellites for dual-frequency is only 5 due to the low tracking...
Crawler-type vehicles are widely employed in the field of engineering. The visualization of crawler belt was an important aspect in the simulation system, which were compounded of many pedrail units connected with each other. The motion of pedrail was very complex and was mostly represented in the traditional keyframe animation approach. We present a simple method for visualization of crawler-type...
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