【作者】 陈叙；

【导师】 杨万全；

【作者基本信息】 四川大学 ， 通信与信息系统， 2001， 硕士

【摘要】 本文研究如何利用现有的机载模拟电台实现话音和飞参数据的综合传送，其原理是：在发送端，先将模拟话音信号数字化并进行压缩编码，再将压缩后的话音数据信号与待传的飞参数据信号复用。然后，对复用信号进行加密编码、卷积编码和比特交织处理。最后，对比特数据流作数字π／4-DQPSK调制，通过D／A转换输出，信号送给机载模拟电台。在接收端，先将机载模拟电台输出的信号滤波及放大限幅，然后进行A／D转换，再实现信号的数字π／4-DQPSK解调、解交织、维特比译码和解密译码。最后，将信号解复用后，恢复成语音信号及数据信号。该系统以软件无线电和全数字接收机为理论基础，以高速DSP芯片为核心构成系统的硬件平台，用软件实现基带数字信号处理和音频载波调制与解调，达到用机载模拟电台综合传送飞参数据和话音信号的目的。深入研究表明，该系统具有可行性。本文对上述系统的工作原理作了详细分析，并着重介绍了系统工作软件设计、系统调试与仿真等本人参与的研究工作。更多还原

【Abstract】 How to implement the transmission of data of the flight parameters and audio signal simultaneously through airborne analog radio transceiver is researched in this paper. The principle is: at the transmission part, firstly the digitized and compressed speech signal and the data are multiplexed. Secondly, the data stream is encrypted, convolution-encoded and interleaved. Thirdly it is differentially encoded and digitally π/4-DQPSK modulated. At last it is through the D/A converter and transmitted to the airborne analog radio. At the receive part, the received signal firstly is filtered, amplified, amplitude-limited and goes through a A/D converter, then the data stream is π/4-DQPSK demodulated, differentially decoded, deinterleaved and Viterbi decoded. Finally the signal is decrypted, demultiplexed and restored to the original speech signal and original data. This system is based on the Software Radio conception and whole-digital receiver principle and use DSP chips as its operating platform. It implements the baseband signal processing and modulation/demodulation through software. The research shows the above scheme has the feasibility. This paper analyzes the operating principles of this system in details and focuses on my work which includes the system’s software designing, debugging and simulating.更多还原