1. 中国科学院国家授时中心,西安,710600
2. 中国科学院大学,北京,100039
3. 中国科学院精密导航定位与定时技术重点实验室,西安,710600
网络首发:2013-10-10,
纸质出版:2013
移动端阅览
李实锋 1, 2, 王玉林 1, 等. 罗兰-C信号的抗干扰快速检测方法[J]. 西安交通大学学报, 2013,47(10):91-96.
A Fast Anti-Interference Detection Method for Loran-C Signal[J]. 2013, 47(10): 91-96.
李实锋 1, 2, 王玉林 1, 等. 罗兰-C信号的抗干扰快速检测方法[J]. 西安交通大学学报, 2013,47(10):91-96. DOI: 10.7652/xjtuxb201310016.
A Fast Anti-Interference Detection Method for Loran-C Signal[J]. 2013, 47(10): 91-96. DOI: 10.7652/xjtuxb201310016.
针对罗兰-C导航定时接收机传统信号检测时间长、抗干扰性能差的缺点
提出了一种罗兰-C信号抗干扰快速检测方法。该方法首先将经过AD采样的罗兰-C信号与本地产生的载波信号进行混频得到同向/正交两个支路信号
通过低通滤波器滤除高频成分后进行平方相加消除本地载波与罗兰-C信号载波之间的相位差
然后将得到的罗兰-C信号包络进行延迟相乘累积得到相关累积峰
基于相关峰的分析判决即可实现罗兰-C信号的检测。理论分析与实验结果表明:该方法的信号检测时间少于200 ms
比传统方法提高了数千倍; 抗窄带干扰性能优于-20 dB
比传统方法提高了10 dB
解决了强窄带干扰环境下罗兰-C信号的快速检测问题。
A fast anti-interference detection method for Loran-C signal is proposed to improve the disadvantages of Loran-C navigation and timing receiver
such as long time in signal detection and poor performance in anti-interference. The method obtains two in-phase/quadrature(I/Q)branch signals through mixing the Loran-C signal that has been AD sampled and the local carrier signal. Then the phase difference between the local carrier and the Loran-C signal is eliminated by filtering out the high frequency components when the I/Q signals pass through a low-pass filter and calculating the sum of squares. Finally
delay multiplications on the signal envelopes of the obtained Loran-C signals are performed and accumulated to get the correlation accumulation peak. The detection of the Loran-C signal is then realized based on the analysis and judgment on the correlation peak. The theoretical analysis and experiment results show that the detection time of the proposed method is less than 200 ms
which is thousands of times shorter than the traditional method is
and the performance of anti-narrow band interference is superior to -20 dB
improving 10 dB compared with the traditional method. It seems that the fast detection problem of Loran-C signal in the intensive narrow-band interference environment is solved.
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