摘要
根据伽利略搜救信标信号的特点,利用纯载波段和位帧同步段信息,提出采用广义似然比检验（GLRT）和极大似然（ML）估计方法实现搜救信号检测,同时得到信号到达频率（FOA）、信号到达时间（TOA）和信息位宽的粗略估计值.仿真与硬件实现后的测试结果表明,当接收信号载噪比为34.8dB·Hz时,无虚警且正确检测概率可达0.97以上,指标优于系统要求的0.95.
According to Galileo search and rescue beacon signal characteristics,generalized likelihood ratio test （GLRT）and maximum likelihood （ML）estimation method are used to achieve search and rescue signal detection as well as acquiring the rough estimation of FOA,TOA and bit width based on the pure tone and bit-frame synchronization information.The results of simulations and hardware tests show that there is no false alarm and the probability of correct detection is beyond 0.97when the carrier to noise ratio of received signal is 34.8dB·Hz.The result is better than the system requirement which is 0.95.
出处
《北京理工大学学报》
EI
CAS
CSCD
北大核心
2010年第8期969-973,共5页
Transactions of Beijing Institute of Technology
关键词
搜救
信号检测
广义似然比检验(GLRT)
极大似然(ML)估计
search and rescue
signal detection
generalized likelihood ratio test （GLRT）
maximum likelihood （ML）estimation
