多通道通信信号源研制
发布时间：2018-07-15 16:10
【摘要】：信号源作为一种重要的仪器,在导航、通信、测试等领域有着广泛的应用。在这些应用中信号源一般用于产生激励信号,对系统进行测试。随着电子和通信技术的飞速发展,待测系统日益复杂,对信号源性能要求也越来越高,主要表现在高频率、宽频带、多模式、多通道等方面。另外,为了提高测试的准确性和信号源的通用性,信号源须具备参数变化速度快、信号产生方法灵活、系统稳定可靠、信号频谱纯度高等优点。针对信号源的需求特点,基于软件无线电思想,设计实现多通道通信信号源。构架ARM+FPGA+DAC实时处理硬件平台,实现信号模式产生、多通道数字移相,ARM接口及存储控制、系统时序产生和外围接口产生电路。该信号源能模拟超短波通信信号(30~600MHz)及卫星上行通信信号(1600~1700 MHz),实现AM、FM、PSK、QPSK、FSK、4FSK、跳频等调制模式信号,通过多通道移相和功率控制实现内场测试的目标方位、距离模拟功能,能工作在定频或跳频两种通信模式。在信号生成技术上,深入研究直接数字合成技术(DDS)基本结构和工作原理,分析了直接波形合成技术(DDWS)和直接数字频率合成技术(DDFS)两种频率合成方法的原理、硬件结构及其优缺点,结合这两种方法在任意波形合成中的应用条件,选用DDFS技术产生分辨率高,频率、相位调制方便,转换速度快,且输出波形相位连续的数字信号;为进一步提高信号源输出频率和带宽,鉴于实际器件工作时钟限制,数字端运用并行DDFS技术,产生低时钟高速率的数字信号;利用超奈奎斯特原理,在奈奎斯特第二域重构高频率宽带宽模拟输出信号。利用通信调制算法,产生高精度,多模式测试信号。结合FPGA的软件重构性,可实现信号源的参数和信号形式的实时可变。通过深入研究干涉仪原理,反向生成具有相位差的模拟干涉仪信号来模拟目标信号的方位,测试待测系统对于方位的检测和识别性能。并设计鉴相反馈模块,通过数字调相实现通道间的同步。
[Abstract]:As an important instrument, signal source is widely used in navigation, communication, testing and other fields. In these applications, signal sources are generally used to generate excitation signals and test the system. With the rapid development of electronic and communication technology, the system to be tested is becoming more and more complex, and the performance of signal source is becoming more and more high, mainly in the aspects of high frequency, wide frequency band, multi-mode, multi-channel and so on. In addition, in order to improve the accuracy of the test and the generality of the signal source, the signal source should have the advantages of fast change of parameters, flexible signal generation method, stable and reliable system, high purity of signal spectrum, and so on. According to the demand characteristics of signal source, a multi-channel communication signal source is designed and implemented based on the idea of software radio. The real-time processing hardware platform of arm FPGA DAC is constructed to realize signal mode generation, multi-channel digital phase shift arm interface and storage control, system timing generation and peripheral interface generation circuit. This signal source can simulate ultrashort wave communication signal (30 ~ 600MHz) and satellite uplink communication signal (1600 ~ 1700MHz), realize modulation mode signal such as AMFM / PSK / QPSK / FSK4, frequency hopping and so on, and realize the target azimuth and distance simulation function of internal field test by multi-channel phase shift and power control. Can work in constant frequency or frequency hopping two communication modes. In the aspect of signal generation, the basic structure and working principle of Direct Digital Synthesis (DDS) are studied, and the principles of Direct Waveform Synthesis (DDWS) and Direct Digital Frequency Synthesis (DDFS) are analyzed. Hardware structure and its advantages and disadvantages, combined with the application conditions of these two methods in arbitrary waveform synthesis, DDFS technology is selected to produce digital signals with high resolution, frequency, convenient phase modulation, fast conversion speed and continuous waveform phase. In order to further improve the output frequency and bandwidth of the signal source, in view of the working clock limitation of practical devices, the digital terminal uses parallel DDFS technology to generate digital signals with low clock and high rate. The high frequency wideband wide analog output signal is reconstructed in Nyquist second domain. By using the communication modulation algorithm, high precision and multi-mode test signals are generated. Combining with the software reconfiguration of FPGA, the parameter and signal form of signal source can be changed in real time. By deeply studying the principle of interferometer, the analog interferometer signal with phase difference is generated in reverse to simulate the azimuth of target signal, and the performance of azimuth detection and recognition of the system is tested. The phase feedback module is designed, and the synchronization between channels is realized by digital phase modulation.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN741;TN79
[Abstract]:As an important instrument, signal source is widely used in navigation, communication, testing and other fields. In these applications, signal sources are generally used to generate excitation signals and test the system. With the rapid development of electronic and communication technology, the system to be tested is becoming more and more complex, and the performance of signal source is becoming more and more high, mainly in the aspects of high frequency, wide frequency band, multi-mode, multi-channel and so on. In addition, in order to improve the accuracy of the test and the generality of the signal source, the signal source should have the advantages of fast change of parameters, flexible signal generation method, stable and reliable system, high purity of signal spectrum, and so on. According to the demand characteristics of signal source, a multi-channel communication signal source is designed and implemented based on the idea of software radio. The real-time processing hardware platform of arm FPGA DAC is constructed to realize signal mode generation, multi-channel digital phase shift arm interface and storage control, system timing generation and peripheral interface generation circuit. This signal source can simulate ultrashort wave communication signal (30 ~ 600MHz) and satellite uplink communication signal (1600 ~ 1700MHz), realize modulation mode signal such as AMFM / PSK / QPSK / FSK4, frequency hopping and so on, and realize the target azimuth and distance simulation function of internal field test by multi-channel phase shift and power control. Can work in constant frequency or frequency hopping two communication modes. In the aspect of signal generation, the basic structure and working principle of Direct Digital Synthesis (DDS) are studied, and the principles of Direct Waveform Synthesis (DDWS) and Direct Digital Frequency Synthesis (DDFS) are analyzed. Hardware structure and its advantages and disadvantages, combined with the application conditions of these two methods in arbitrary waveform synthesis, DDFS technology is selected to produce digital signals with high resolution, frequency, convenient phase modulation, fast conversion speed and continuous waveform phase. In order to further improve the output frequency and bandwidth of the signal source, in view of the working clock limitation of practical devices, the digital terminal uses parallel DDFS technology to generate digital signals with low clock and high rate. The high frequency wideband wide analog output signal is reconstructed in Nyquist second domain. By using the communication modulation algorithm, high precision and multi-mode test signals are generated. Combining with the software reconfiguration of FPGA, the parameter and signal form of signal source can be changed in real time. By deeply studying the principle of interferometer, the analog interferometer signal with phase difference is generated in reverse to simulate the azimuth of target signal, and the performance of azimuth detection and recognition of the system is tested. The phase feedback module is designed, and the synchronization between channels is realized by digital phase modulation.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN741;TN79
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