基于FPGA的伪码测距电路设计

A Design of Pseudo-random Code Ranging Circuit Based on FPGA

介绍伪随机码的性质,将伪随机码用于无线电测距中。采用滑动相关法实现伪随机码的捕获,并给出捕获电路的原理和仿真结果。用脉冲计数法实现捕获完成后的两组伪随机码相位差的精确测量。在FPGA芯片EP1C3T144C8进行硬件验证,结果表明该电路可以实现2.5ns的测时精度。

The character of pseudo-random code is introduced.Pseudo-random code is applied in radio ranging.The acquisition of pseudo-random code is realized by the way of serial gliding correlation.The principle and the simulation result of acquisition circuit are proposed.The phase difference of pseudo-random code after acquisition is measured by the method of pulse counting.The circuit is tested in FPGA chip EP1C3T144C8.The result shows that the time measurement precision of this circuit is 2.5ns.