脉码调制遥测系统性能好坏的重要标志是遥测参数经过远距离传输后“不走样”,也就是说,地面接收解调所得到的参数与实际值相比误差小。遥测参数的误差主要来源于传输过程中杂散电波的干扰。目前,人造卫星的遥测系统广泛采用一种脉冲编码调制的技术,简称脉码调制。这是一种能从根本上增强遥测系统的抗干扰能力。提高遥测精度的先进的调制方法。如前所述,传感器的输出是一个与被测参数大小成比例的电压信号。因为它是用电压幅度来“模拟”被测参数的大小的,所以叫做模拟信号。前面所讲的调制指的是用这 Pulse code modulation telemetry system performance is an important indicator of good or bad is the telemetry parameters after long-distance transmission “does not like”, that is, the ground received demodulation parameters obtained compared with the actual error is small. The error of the telemetering parameters mainly comes from the interference of stray radio waves in the transmission process. At present, satellite telemetering system widely uses a pulse code modulation technology, referred to as pulse code modulation. This is a radically enhanced anti-jamming capability of telemetry systems. Advanced modulation method to improve telemetering accuracy. As mentioned earlier, the sensor output is a voltage proportional to the size of the measured signal. Because it is the voltage amplitude to “simulate” the size of the measured parameters, so called analog signals. The modulation mentioned above refers to this