摘要
针对伪码测距高度表增大测高范围和提高测量精度矛盾的情况,给出了一种在提高伪码测距高度表的测高精度时不影响测高范围的方法,并利用现行电子元器件的精确和高速处理能力来实现;该方法引入频率为伪随机序列码元频率的M倍的脉冲序列,通过对其单个脉冲的增减,得到本地伪码与接收伪码在码片内的准确延时,从而提高高度的测量精度;仿真结果表明,使用FPGA实现此方法既能满足高度表提高测量精度的要求,同时也满足测高范围大的要求。
A method of improving the measurement accuracy of altimeter was proposed, aiming at solving of the conflict between measurement accuracy and extension, of range based on advantage of accuracy and rapid process capability of modern electronic devices. A sequence of pulses with a frequency several times higher than the pseudo--random sequence was adopted and the measuring accuracy was improved because of the obtaining accurate time that pseudo--random sequence delay in a code by adding or abstracting single pulse of the a- dopted pulses. The simulation results indicate that the method meets the request of the measurement accuracy of altimeter based on FPGA.
出处
《计算机测量与控制》
CSCD
2008年第7期901-902,905,共3页
Computer Measurement &Control
关键词
高度表
测距精度
脉冲
伪随机序列
FPGA
altimeter
measurement accuracy
pulse
pseudo-- random sequence
FPGA
