Algorithms for Elimination of the Redundancy of the Information Transmitted from Onboard Telemetry System to the Earth
In this article the characteristics of some onboard radiotelemetry systems (RTS) are given. A method for forming the data for the egress frame of the onboard RTS and the arising redundancy in the data packages transmitted to the earth are described. Two methods of elimination of the arising redundancy are considered: the adaptive difference algorithm of data forming and a method based on the constructive theorem of the remainders.The adaptive difference algorithm is an accumulative algorithm with a packet transmission of the data. It is characterized by a low noise stability and an information transfer lag. Those characteristics impose limitations on its applicability.For control, or when an emergency occurs, large delays in data transmission are inadmissible. The essence of the method based on the constructive theorem of the remainders consists in halving of the dynamic range of the transmitted data. In place of the initial 2n-digit word-measurement, its remainder of division by 2n, which occupies half as many bits, is transmitted. The deduction of redundancy based on this algorithm can be used when it is known in advance that the measured parameter cannot have difference between any two consequential measurements of more than 2n on a scale of 22n.