The development of Haar telemetry system

A Haar telemetry system is introduced. There are two key points for construction of a Haar telemetry system: to generate Haar function waveforms and to design a multivalue logic multiplier. First, the way of building the Haar function generator is discussed. 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 amplifiers, switching element, and its control circuit. Thirdly, according to the relationship between Haar waveforms and switching control signal, the multipler is combined with the generator as a whole which is called a Haar function modulator. The function of the modulator is the same as that of a Haar function generator plus a number of multipliers, but the circuit is greatly simplified. The experimental results show that the new system is defective and seems to be a little better than the Walsh system.