Volume 38, Number 5, October 2020
|Page(s)||1010 - 1017|
|Published online||08 December 2020|
Voice and Position Simultaneous Communication System Based on Beidou Navigation Constellation
School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
2 Shaanxi Radio Monitoring Station, Xi'an 710065, China
Considering China Beidou has unique two-way communication capability for short messages that are not available in other navigation systems such as GPS, a 600bps vocoder adapted to the short message channel of Beidou is developed. The sinusoidal excitation linear prediction algorithm is adopted by the vocoder to achieve voice communication with clear communication quality. Furthermore, a coordinate compression algorithm for processing positioning information is designed to provide more transmission space for speech encoded data. Based on the above-mentioned results, a communication system that only the Beidou navigation system is used to complete two-way secure voice and positioning simultaneous interpretation is realized. The system firstly uses a voice conversion program to convert the voice coded data obtained by the vocoder codec module into the Beidou short message data format; and then the voice code analysis program and the latitude and longitude analysis program is used to parse the voice code and location information; Finally, the experimental results of voice communication and positioning transmission are verified on the Beidou short message transceiver, and the subjective MOS test score indicates that the way is paved for the practical use of Beidou short message voice communication.
针对中国北斗比GPS等其他导航系统独有的短报文双向通信功能，研发了适配北斗短报文信道的600 bit/s声码器。声码器采用正弦激励线性预测（sinusoidal excitation linear prediction，SELP）算法，实现了通信质量清晰的语音通信，并进一步设计了一种处理定位信息的坐标压缩算法，为语音编码数据提供了更大的传输空间。基于以上研究，实现了仅用北斗导航系统完成双向保密语音和定位同传的通信系统。该系统首先利用语音转换程序将声码器编解码模块获取的语音编码数据转换为北斗短报文数据格式；然后利用语音编码解析程序与经纬度解析程序从北斗短报文数据中解析出语音编码与位置信息；最后，在北斗短报文收发器上验证了语音通信与定位传输实验效果，主观MOS测试评分表明该研究为北斗短报文语音通信实用化铺平了道路。
Key words: Beidou short message / SELP / low rate speech coding / coordinate compression / voice and positioning simultaneous communication system
关键字 : 北斗短报文 / SELP / 低速率语音编码 / 坐标压缩 / 语音与定位同传通信系统
© 2020 Journal of Northwestern Polytechnical University. All rights reserved.
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