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机场天气雷达要求能够从复杂的天气环境中识别不同的天气状况以保障航空飞行安全,其接收机大动态以及抗噪性能设计对雷达至关重要。在分析模数转换器(ADC)对雷达中频接收机动态范围制约的基础上,根据中频带通采样和数字下变频的原理,实现了基于现场可编程门阵列的双通道ADC采样数字中频处理系统,并给出了系统的设计原理、方法以及测试结果。通过对双通道ADC采样的数字中频处理系统的实现,能够很好地提高天气雷达接收机的动态范围,并应用于机场多普勒天气雷达数字中频接收机。
Airport weather radar requirements from different weather conditions to identify different weather conditions in order to ensure the safety of aviation flight, the receiver of large dynamic and anti-noise performance design is essential for the radar. On the basis of analyzing the control of the ADC’s dynamic range of the radar IF receiver, based on the principle of IF band-pass sampling and digital down-conversion, a dual channel ADC sampling digital IF processing system based on field programmable gate array , And gives the system design principles, methods and test results. Through the implementation of digital IF processing system for dual-channel ADC sampling, the dynamic range of the weather radar receiver can be well improved and applied to the Doppler weather radar digital IF receiver of the airport.