High Speed Signal Telemetry Acquisition and Coding Technology Based on Delayed Transmission
Zhao Ha · Journal of Spacecraft TT&C Technology · 2015
A telemetry acquisition and coding technology based on delayed transmission is presented to meet the requirements of data analysis of high speed signals produced by the fuse at the moment a missile encounters its target.Data acquired is cached for delayed transmission.Before signal signatures meet transmission requirements,the data channels are continually detected.The data is cached in RAM(Random Access Memory)while telemetry datas of other signals are sent.When transmission conditions are met,the transmission of other telemetry signals is intermitted and the data cached in the RAM is read out from the RAM and transmitted.This not only lowers data rate of the system,but also minimizes negative impact of realtime transmission of high rate data.Hierarchical quantization is used in data coding and resolution of low amplitude signals,which is of more concern in data analysis,is increased.Such a telemetry acquisition and coding scheme has the advantages of shortened RD(Research and Development)cycle,reduction of RD cost and low technical risks.The scheme has been successfully used in flight tests.