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随着空间技术的发展,信息传输的距离越来越遥远,而宇宙飞船上发射机由于受体积、重量等限制,不可能提供很大的发射功率,因而在地面上能接收到的信号是很微弱的。因此,在遥远距离的信息传输中,常常要采用抗干扰能力强和易于检测处理的系统。使用信号分层的脉冲通信系统,可以提高通信的抗干扰性、准确性、有效性和便于数据处理。△调制系统具有与二进制脉冲编码系统几乎同等的优点,然而其设备远比脉冲编码系统简单,因此引起了人们极大的兴趣和注意。
With the development of space technology, the distance of information transmission is getting more and more distant. However, the spacecraft transmitter can not provide a large transmitting power due to the limitation of volume, weight, etc., and thus the signal that can be received on the ground is very high weak. Therefore, in the long-distance transmission of information, it is often necessary to adopt a system that has strong anti-interference ability and easy detection and processing. The use of signal-layered pulse communication system, can improve communication immunity, accuracy, effectiveness and ease of data processing. △ modulation system has the same advantages as the binary pulse code system. However, its equipment is much simpler than the pulse code system, and therefore has drawn great interest and attention.