文档介绍：摘要
摘要
短波通信在军事通信中有着举足轻重的作用,使用传统技术的电台已难以满
足现代军事通信对网络容量与数据传输质量的要求,因此研究第三代短波通信系
统具有重要意义。本文以 MIL-STD-188-141B 协议为理论依托,结合先进的数字
信号处理技术,力求在短波信道上实现可靠的数据传输。
通过深入研究第三代短波通信系统物理层突发波形接收端的关键技术,针对
短波信道中存在噪声,多径衰落和多普勒频移的特点,本文设计了突发波形的接
收端方案,其中完成的主要工作有:利用滑动分段相关 FFT 技术,解决了低信噪
比、大频差条件下的信号捕获难题;利用相关 FFT 和二次曲线拟合相结合的方法,
完成了频差的精确估计;利用滑动相关技术,完成了精细位同步与信道估计;利
用一种改进的内插滤波器进行定时恢复,解决了 A/D 采样偏差的问题。Matlab 仿
真结果表明,设计的接收端方案可靠有效,完全满足 141B 协议的要求。
最后,本文在以 DSP 为核心的硬件平台上,对整个突发波形系统的发送与接
收过程进行了编程实现。

关键词:突发波形相关 FFT 捕获定时恢复
Abstract
Abstract
munication plays an important role in munications, while the
traditional HF radio can not meet the increasing requirements work capacity and
the quality of data transmission in modern munications. It is of great
significance to research the 3G munication system. Based on the protocol of
MIL-STD-188-141B bined with advanced DSP technology. This thesis aims at
achieving a reliable data transmission in HF channel.
Based on the research of the key technologies in receiving of Burst-Waveform on
the 3G munication, and considering the effects of noise, fading, multi-path and
doppler shift on HF channel, receiving schemes with key technologies of the
Burst-Waveform are designed in this thesis. Sliding subsection correlation-FFT
technique is adopted to solve the signal acquisition problem under the condition of low
SNR and large frequency-offset; Correlation-FFT and Conic fitting techniques are
introduced to improve the precision of frequency-offset estimation; The method of
sliding-correlation is used to solve the problem of symbol synchronization and channel
estimation; The warp of A/D sampling is rectified by using an improved interpolation
filter for Timing-Recovery. The system is simulated with Matlab, and the results show
that the receiving schemes can meet the requirements of 141B pletely.
Finally, the entire schemes, include sending scheme and receiving scheme, are
tested on the DSP hardware platform.

Keyw