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利用地面数字电视信号进行定位,可以成为卫星在市区室内定位的补充和辅助手段。该文基于中国地面数字电视系统中时域同步正交频分复用(TDS-OFDM)信号的时频二维处理特性,提出了一种利用信号帧头中伪随机噪声(PN)序列和帧体内传输参数信令(TPS)的时频二维联合定位方法。该方法把TDS-OFDM信号中帧体内的TPS时分复用后看作正交频域导频,与帧头的时域PN序列一起联合估计信号的传输时延,计算到达时间差(TDOA)进行定位。该方法计算所需乘法次数与定位数据量持平;当信噪比(SNR)高于20dB时,在加性高斯白噪声(AWGN)信道下的测距估计误差为0.15m。理论分析和仿真结果显示:该方法不但计算复杂度低,且测距精度高,具有一定可行性。
The use of terrestrial digital television signals for positioning can become a satellite in the city indoor positioning supplement and auxiliary means. Based on the time-frequency two-dimensional processing characteristics of time-domain synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM) signals in terrestrial digital terrestrial television system in China, this paper proposes a novel algorithm that utilizes the pseudo-random noise (PN) In vivo transmission parameter signaling (TPS) in time-frequency two-dimensional joint positioning method. The TDS-OFDM signal in the frame TPS time-division multiplexed as an orthogonal frequency domain pilot, and the header of the time-domain PN sequence jointly estimated signal transmission delay, calculate the arrival time difference (TDOA) positioning . The number of multiplications required for this method is the same as the amount of positioning data. When the signal-to-noise ratio (SNR) is higher than 20dB, the estimation error of ranging in additive white Gaussian noise (AWGN) channel is 0.15m. Theoretical analysis and simulation results show that this method not only has low computational complexity and high ranging accuracy, but also has some feasibility.