基于包络分析的空测数据压缩传输

Telemetry Data Compression and Transmission Based on Envelope Analysis

针对目前遥测设备的通讯能力有限,不能满足地面实时观测的实际问题,本文提出将包络分析应用于飞机飞行试验数据的压缩传输,该方法为空测数据的实时传输提供了一条有效的解决途径。首先通过对空测数据的极值提取、插值及拟合处理获取其包络线,然后求取包络的频谱,再根据采样定理确定其重新采样频率,即可在保证试验数据基本特征和变化规律的前提下,实现数据传输量的减少。通过对一组实际空测振动数据的处理分析,验证了该方法的有效性。

For the problem of telemetry communication can not meet the demand of the real-time observing on the ground, this paper proposes a method which applied the envelope analysis to data compression and transmission of flight tests, it provides an effective way for the real-time transmission of telemetry data. First, by picking up the extreme points, interpolating and fitting, the envelope of the telemetry data is acquired. And then the spectrum of the envelope is calculated and according to the sampling theorem, the re-sampling frequency is decided, which could achieve the reduction of data transmission on the premise of maintaining the basic characteristic and change rule of the data. In the end, through processing and analyzing a group of actual telemetry vibrational data, the efficiency of the method was testified.