软件无线电接收机数字前端中的信道化与TIADC校准技术研究

Software radio receiver has been widely used in radar, electronic warfare and other military fields. Increasingly complex battlefield electromagnetic environment requires large bandwidth, high flexibility, high sensitivity, and other properties from the receiver. As a wideband receiver system, the flexibility of digital channelized receiver must be further enhanced to meet these requirements. Due to the high sampling rate and high resolution, TIADC is widely used in the receiver. However, if we do not calibrate its mismatch errors, it will seriously reduce the sensitivity of the receiver. Therefore, it is very important to study the channelization and TIADC calibration circuits with small size, low power, and high flexibility. Based on the above problems and the deficiencies in the current study, the research contents of this project include a hybrid channelization architecture based on first "rough division" then "finer division" technique, a TIADC calibration method with no feedback loop, and a TIADC calibration method based on time varying quantization technique. We mainly break through the following techniques: a hybrid channelization architecture with wideband, non-uniform distribution, and dynamic configuration properties, a feed-forward TIADC calibration method that can calibrate the gain and time errors at the same time, and a TIADC calibration method that can simultaneously remove the nonlinear distortions generated by the mismatch errors and quantization circuit. The research results will break through some key technology bottlenecks for the design of software radio receiver.

软件无线电接收机已广泛用于雷达、电子战等军用领域。日益复杂的战场电磁环境要求接收机具有大带宽、高灵活性、高灵敏度等性能。数字信道化接收机作为一种宽带接收机体制，其灵活性须进一步提高才能满足上述需求。TIADC因其高采样率和高分辨率而广泛用于接收机中，但如果不对其失配误差进行校准，将会严重降低接收机的灵敏度。因此，研究小面积、低功耗、高灵活的信道化和TIADC校准电路具有重要意义。基于上述问题和当前研究的不足，本课题的研究内容包括：先“粗糙划分”后“精细划分”的混合信道化结构、无反馈环路的TIADC校准方法、基于时变量化技术的TIADC校准方法。重点突破具有宽带、非均匀分布、可动态配置特性的混合信道化结构设计、能同时校准增益和时间误差的前馈TIADC校准方法、能同时去除失配误差和量化电路产生的非线性失真的TIADC校准方法。本课题的研究成果将为软件无线电接收机的设计突破一些关键技术瓶颈。

软件无线电接收机已广泛用于雷达、电子战等军用领域。日益复杂的战场电磁环境要求接收机具有大带宽、高灵活性、高灵敏度等性能。信道化接收机作为一种宽带接收机体制，其灵活性需进一步提高才能满足上述需求。.基于上述问题和当前研究的不足，本项目的研究内容包括：具有宽带、可动态配置特性的数字下变频技术和先“粗糙划分”后“精细划分”的混合信道化技术。.本项目的研究成果列举如下：.（1）提出了一种宽带数字下变频结构，可以实时处理采样率高达7.2GS/s的输入数据。宽带实时处理和在线可重配置功能使得我们的方案成为多路数字下变频并行信道化的更好选择。.（2）提出了一种混合信道化结构，它最多可以支持1024个信道输出，且可以独立配置每个输出信道的参数。与现有的信道化设计相比，它不仅具有灵活的在线重配置特性，而且消耗较少的硬件资源。.（3）提出了一种灵活且资源有效的信道化结构，可以同时监测DRM30和FM频段的多个无线电台，而其他工作要么支持FM标准，要么支持DRM30标准。由于具有在线可重配置和较少硬件资源的优势，提出的信道化结构是数字广播监测和音频索引应用的更好选择。.本项目的研究成果对于丰富和完善软件无线电接收机数字前端技术，推动软件无线电技术在电子战、雷达、卫星通信等军用领域的应用，具有重要的实际价值。