摘要
伪码扩频测高计存在多径效应引起的相关峰重叠,仅使用相关峰积分比较处理的方式测高误差较大,为此提出相关峰微分比较及边沿捕捉方法。对相关峰进行微分处理,将主相关峰零位移点转换成脉冲信号的下降沿,通过软件中断系统,对主峰对应的下降沿进行捕捉,得到对应的距离信息。动态试验表明,可以解决多径效应引起的相关峰重叠,实现了主相关峰与多径相关峰的分离,并且准确的提取了相关峰的零位移点。
Because of correlation peak overlapping caused by multi-path effect exists in pseudorandom-code spread spectrum altimeter, more error in height measurement will be made by using correlation peak integrating comparing only. Therefore,a method of correlation peak differential comparing and edge catching was put forward. As described in section 3, for the correlation peak differential processing, first the zero displacement of main correlation peak is transformed into falling edge of pulse signal, then the falling edge relative to main peak is caught by software interrupt system. The corresponding information of range is acquired at last. Dynamic test shows that this method can solve the question of correlation peak overlapping caused by multi-path effect, thus realizing the separation of the main correlation peak from multi-path correlation peak and accurate extration of the zero displacement of correlation peak.
出处
《探测与控制学报》
CSCD
北大核心
2008年第4期36-39,共4页
Journal of Detection & Control
关键词
测高计
伪码扩频
多径效应
微分比较及边沿捕捉
altimeter
pseudorandom-code spread spectrum
multi-path effect
differential comparison and edge catching
