An Advanced Digital Ranging and Telecontrol Apparatus

Abstract

An earth station apparatus and its technical specificities and components are described in this article. Which is used for locating and telecontrol of flying objects. The pseudo-random spread spectrum system compatible with GPS is used in measuring the distance and velocity of moving-targets. The ranging and range-rate measuring signals and telecontrol signal are included in up link. The CDMADS, GLOD code are used for ranging and range-rate measuring. The GLOD code rate varies from 1 Kbps to 2.048 Mbps in step 1 bit. The subcarrier modulation systems of telecontrol are PSK, FSK, MFSK and High alphabet modulation. The frequency of subcarrier varies from 1 KHz to 1 MHZ in step 1 Hz. The rate of instruction code varies from 50 bps to 38.4Kbps in step 1 bit. The modulation indexes varies from 0.7 to 2 in 16 steps. The polarization diversity technique of digital symmetical common mode and differential mode loops are applied in down link receiver. It is used for demodulation of back signal, ranging and range-rate measuring signal and A, E error signal used by track system. The digital technique and modularization bus technique are used throughout the apparetus. All modules in apparatus and their principle are discussed in thes article.