THE DEVELOPMENT OF HAAR TELEMETRY SYSTEM

Abstract

In this paper a Haar telemetry system is introduced. There are two key points for construction of the Haar telemetry system: to generate Haar function waveforms and to design a multivalue logic multiplier. First, we discuss the way of building the Haar function generator. There are several ways to solve this problem. One of them will be introduced in some detail. Secondly, the multivalue logic multiplier is described. The multiplier consists of three parts: operational amplifier, switching element and its control circuit. Thirdly, according to the relationship between Haar waveforms and switching control wignal, we combine the multiplier with the generator as a whole which is called Harr function modulator. The function of the modulator is the same as Haar function generator plus a number of multipliers, but the circuit of which is greatly simplified. The experimental results show that the new system is effective and as compared with Walsh system the Haar one seems to be a little better.