Digital Signal Processing based Telecommand Receiver for Space Application

摘要

This paper describes the new design Concept used in the design and development of S-Band Tele Command receiver for remote sensing Satellites. The design and implementation is done to satisfy mission requirements of reduced size, weight and low power consumption. The architecture employs new state of art components, RFlCs and digital High speed devices for microwave application. The paper presents theoretical modeling and analysis of the entire receiver. The TC receiver is divided into three sections namely, RF front-end, Digital demodulator, Local Oscillator (LO). The receiver RF front end takes care of the low noise amplification and dual down conversion of the S-Band signal to IF signals. The IF signals processing is done in digital domain to detect the Pulse Code Modulated (PCM) data and a synchronized clock. The digital design is implemented in FPGA using VHDL. Optimizations in terms of usage of gate array resources in FPGA, maximum frequency of operation, and power consumption is achieved by the choice of various optimized algorithms. The paper describes system level design architecture followed by implemented algorithms and performance of critical stages in the receiver. Though the design is specifically targeted for Low Earth Orbit (LEO), the methodology of the receiver can also be extended for deep space telemetry tracking and command (TT&C) transponders where size, weight and power are the main constraints