中文摘要：

1 090 MHz是民用和军用航空领域多个电子系统的共用频率,针对其存在的频谱拥塞和同频干扰问题,提出了一种基于通用无线电外设（USRP）和GNU radio的频谱监测接收机架构,该接收机在通用软件无线电平台上实现了S模式和A/C模式信号的检测和解码关键算法。应用于真实场景的信号监测和数据录取,对实时接收的信号进行了时域波形和频谱的观测,分析了录取信号的接收率和功率强度的关系、解码后不同类型信号的频谱占用率等。结果显示,在接收距离约为350 km的情况下,该场景的ATCRBS信号、短S模式信号和长S模式信号26 h内的平均接收率分别为375次/s、79次/s和85次/s,1 090 MHz频谱平均占用率约2.25%,峰值占用率达到3.06%。

英文摘要：

Focusing on the congestion and interference on 1 090 MHz frequency,which is shared by multiple electronic systems in civil and military aviations,a spectrum monitoring receiver was designed based on Universal Software Radio Peripheral（ USRP） and GNU radio,Mode S and Mode A/C signal detecting and decoding algorithm was realized on the receiver. They applied the receiver in real environment and recorded data,real-time signal waveform in time and frequency domain was observed,and the reception rate for different message strength was analyzed,and also the spectrum occupancy for different message types was analyzed after decoding. They recorded data in about 350 km range for 26 hours,the results show that the average received rate of ATCRBS signals,long Mode S signals and short Mode S signals are 375 times / sec,79 times / sec,and85 times / sec respectively,average spectrum occupancy rate is about 2. 25%,peak occupancy rate is about 3. 06%.