基于MSK功率谱的巷道内宽度盲估计方法

One blind estimation algorithm of propagation distance less than code width based on MSK power spectrum

针对传统无线电导航定位系统中需要2个发射台进行精测定位距离的问题,利用最小频移键控(MSK)信号谱线的特点,可以测量接收设备与单个发射台的距离;针对无线电定位系统受信号质量和信道环境的影响而定位精确度不高的问题,本文对单一发射台的MSK信号频谱做平方处理,利用2根谱线的相位差与空间传输距离的线性关系来提高定位精确度。该方法不依赖于信号的同步,可做到盲估计巷道内的宽度。仿真结果表明,在信噪比大于0 d B的信道环境下,测量精确度达到150 m以内。

Because of the traditional radio navigation and positioning system depends on two transmitters to precisely measure distance,Minimum Shift Keying(MSK)signal is utilized to measure distance between receiving equipment and signal transmitter.In order to minimize the impact of the signal quality and channel environment on the radio system,the spectrum of MSK signal is squared to get phase difference between two spectral lines of two frequency points.Utilizing the linear relation of phase difference and space transmission distance improves the precision of measurement.The method completes the blind estimation of propagation distance less-than code-width and does not depend on the signal synchronization.The simulation results show that,under the channel environment of more than0dB,the accuracy of distance estimation is less than150m.