【摘要】 为了验证陆用多普勒里程仪的系统软件设计的合理性以及了解外界环境对系统精度产生的影响,主要是噪声对系统精度的影响,系统对从信号接收到频率解算的整个过程进行仿真。首先对回波信号模型进行分析,然后通过SIMULINK搭建仿真平台,模拟回波信号的接收和处理过程。为了提高系统精度,在进行频率解算前,对回波信号进行预处理,预处理分三个方面:1)信号检测;2)AGC控制;3)滤波处理。最后进行频率解算,在频率解算时,通过对比不同信噪比对算法产生的影响来评论算法的好坏。更多还原

【Abstract】 In order to validate the rationality of the software design of Doppler Overland Log Equipment and understand the effect of the external environment on the precision of the system,mainly the noise,the article made a simulation about all the process from receiving the echo signal to working out the frequency.At first,the article analyzes about the model of the receiving echo signal,and builds simulation platform through SIMULINK,to simulate the receiving signal.In order to improve the system precision,steps should be done before calculating the frequency of the echo signal:1)signal detection;2)AGC control;3)filtering treatment.The final problem is frequency resolving.At the same time,comment on the algo-rithm which is good or bad by comparing the impact of the frequency of different signal to noise ratio on the algorithm.Results show that software design is reasonable,the precision of the calculating the frequency is very high and the speed is also high.And the important thing is the algorithm can restrain the effect on the system precision.更多还原