说明：  根据OFDM的时频特性,提出了一种新的空间测距方法.首先在时域对OFDM信号进行相关处 理,得到距离的粗估计,在粗估计的基础上,利用OFDM不同子载波数据之间的相位差,得到距离的精 确估计,根据精确估计的结果对粗估计的结果进行校正,从而得到最终的距离估计值.仿真结果表明,该 方法的测距精度比采用延迟锁定环的伪码测距方法至少提高了4倍,并且在信噪比大于20 dB时,可以 达到厘米级.
(According to the properties of OFDM in the time and frequency domains, a novel ranging method in space is proposed. The coarse estimation of range can be obtained from the correlation of the waveforms of OFDM signals in the time domain, and the fine estimation is obtained from the phase differences between the sub-carriers in the frequency domain. The fine estimation is then adopted to correct the coarse estimation, and the final estimation of range is achieved. Simulation results show that the ranging accuracy of the proposed method is more than 4 times better than that of pseudo-code ranging. Furthermore, the ranging accuracy is close to the centimeter level when the signal-to-noise ratio is beyond 20 dB. )