低信噪比1090ES报头的恒虚警检测方法

Constant False Alarm Rate Detection Method for 1090ES Preamble with Lower SNR

针对S模式1090 MHz扩展电文(1090ES)的报头检测在低信噪比下虚警概率高的问题,提出基于报头多脉冲匹配滤波的恒虚警率报头检测方法。由于检测门限是利用报头低电平期间的样本确定的,所以该方法对1090ES的数据块中的伪报头的误检具有一定的抑制能力。仿真结果表明,在低信噪比环境下,该文方法相对于传统1090ES报头检测方法具备较好的检测性能,且较好实现1090ES数据块中伪报头的抑制,减轻了后续设备的数据处理负荷。

To solve the problem of high false alarm rate for the preamble detection of Mode S 1090 MHz Extended Squitter(1090ES)with low signal to noise ratio(SNR),a Constant False Alarm Rate(CFAR)preamble detection method based on multi-pulse matching filtering is proposed.Because the detection threshold is determined with the samples received during the low level of preamble,the proposed method has a certain suppression ability against false preamble in 1090ES data block.Simulation results show that,under lower SNR,the method proposed in this paper has better detection performance than the classification methods for detecting the 1090ES preamble,and can suppress the false preamble in data block of 1090ES well.Furthermore,the data processing load of subsequent equipment is reduced.