Telemetry PCM Encoder의 개발연구

Experimental Development of the PCM Encoder for Telemetry

時分割多重化方式에 의한 Telemetry用 PCM encoder를 塔載型遠幅測定에 適合하도록 國産化開發硏究를 追究하였다. Program switch에 의하여 選擇되는 PCM encoder의 analog人力채널은 0~64word/frame($\pm$5V full scale), discrete人力은 0~30bit(5V$\pm$1V or 0V$\pm$1V dc)이며 bit rate는 70 및 140Kbit/sec, 分解能力은 8~12bit/word를 選擇할 수 있다. 그리고 filtered output code는 5次Bessel型LPF($f_{c}$=100kHz)를 통한 NRZ-L 및 Bi$\phi$=S이며 PCM encoder의 시스템誤差는 full scale에 대하여 最大 $\pm$0.2%이다.

The time division multiplexing PCM encoder which is constructed for an airborne telemetering system is investigated. Selected by program switch, the PCM encoder has 0~64 words/framd($\pm$5V full scale) of allowable analog input channels, 0~30bits(5V$\pm$1V or 0V$\pm$1V dc) of discrete channels, 70 and 140K bits/sec of bit rate and 8~12bits/word of resolution. And filtered output PCM code is NRZ-L and Bi-S through the 5 pole Bessel LPF(f=100kHz), and the maximum accuracy of PCM encoder is $\pm$0.2% of its full scale.