1090ES关键信息解码算法优化及实现

Optimization and implementation of key message decoding algorithm for 1090ES

以1090ES广播式自动相关监视(ADS-B)系统的飞机位置报文为信号源,采用ARM Cortex-M4内核的微控制器为硬件平台。针对目前空中交通管制对数据处理的实时性和准确性的要求,对空中目标飞机的经纬度和高度等关键信息进行解码。分析以往查表法在解码中的优缺点,归纳总结和实现了公式法在ADS-B系统位置报文中高度信息的解码。通过在真实数据环境下实验验证,其实验结果表明该方法能很好地克服常规算法繁琐、占用内存资源多等缺点,且软硬件实现更加方便、快捷。

Taking the aircraft position message of the 1090 ES automatic dependent surveillance-broadcast(ADS-B)system as the signal source,the microcontroller with ARM Cortex-M4 kernel is adopted as the hardware platform.In order to satisfy the requirements of current air traffic control for its data processing real-time performance and accuracy,the key messages(such as latitude,longitude and height) of the aerial target aircraft are decoded.The advantages and disadvantages of the available lookup table methods for decoding are analyzed.The formula method used to decode the height information in ADS-B system′s position massage is summarized and realized.The algorithm was verified with experiment in actual data environment.The experimental results show that the algorithm can eliminate the conventional algorithms′ disadvantages(such as the cumbersome procedure and high memory resource occupation),and has convenient and efficient software and hardware implementation.