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探地雷达回波信号数据采集的设计
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2011-01-05
李明
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深入分析探地雷达工作原理以及雷达回波信号的特点，采用基于等效时间取样技术实现探地雷达回波信号的数据采集：采用高精度的数字可编程延时器产生稳定的步进时钟，作为时序步进采样的同步信号，同时采用“PC机+单片机+CPLD”以实现对数据采集、存储和传输的时钟控制。较之以前采用模拟电路技术产生步进采样脉冲，有电路简单、精度高、稳定性好和实时性强等优点。将标准的正弦波通过该采集电路，经处理得到恢复的波形，通过波形对比的方式来验证该设计的性能，从而定性的可以看出该设计能良好的恢复原来的信号，满足设计要求。
- Abstract:
- The ground-penetrating radar working principle as well as the characteristics of the radar echo signal was in-depth analyzed，the data collection method was adopted based on equivalent time sampling technology:using highprecision digital programmable delay devices to produce a stable stepping clock，as a sequential step sampled synchronization signal，simultaneously，using“PC machine + MCU + CPLD”to achieve the clock control of data collection，storage and transmission. Compared to previously using analog circuit technologies produced stepping sampling pulse，this method has advantages of simple circuit，high precision， good stability and strong reatime. Using a standard sine wave through the acquisition circuit as measured signal to verify the design’s performance，and then compared the standard signal with the recovered signal.It can be qualitativly seen that the design can well restore the sound signal，it meets the design requirements.
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chinadou
2013-01-22
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