Abstract
For the multiple parameters estimation of BOC signal at the low SNR and multipath environment, the method which applies the characteristics of cyclic spectrum is developed. Firstly, the cyclic spectrum function of multipath BOC signal is derived. Then the cyclostationary property of BOC signal is analyzed. Finally, a novel parameter estimation algorithm of BOC signal, which makes use of the position of cyclic spectral peaks to estimate the carrier frequency, the subcarrier rate and PN code rate, is present. In the experiment the time-domain smoothing method is used to calculate the cyclic spectrum of BOC signal when the frequency is equal to zero in order to avoid the multidimensional search. At the same time using the method of the cumulative average can increase the SNR margin of the algorithm. Simulation results show that the multiple parameters of multipath BOC signal can be estimated effectively and the estimation performance is associated with the multipath environment.
Highlights
BOC signal has been widely used in various navigation and communication systems, such as Galileo, GPS navigation system and Chinese Beidou navigation system, because its good spectral splitting characteristics can effectively solve the interference of signals in the common bands
DS signal is a second order cyclostationary signal, where the information of chip width, carrier frequency and amplitude of signal is included in the amplitude of cyclic spectrum
The cyclostationary property of multipath DS signals is analyzed, the expressions of both the cyclic correlation function and cyclic spectrum are deduced, and a novel parameter estimation algorithm of DS signals is presented based on cyclic spectrum amplitude[7]
Summary
BOC signal has been widely used in various navigation and communication systems, such as Galileo, GPS navigation system and Chinese Beidou navigation system, because its good spectral splitting characteristics can effectively solve the interference of signals in the common bands. The parameter estimation is completed by the relationship between the peak of auto-correlation function and the spreading code and sub-carrier rate of BOC signal, but the performance is not satisfactory[5]. The cyclostationary property of multipath DS signals is analyzed, the expressions of both the cyclic correlation function and cyclic spectrum are deduced, and a novel parameter estimation algorithm of DS signals is presented based on cyclic spectrum amplitude[7]. BOC signal is a second order cyclostationary signal, so in this paper, for BOC signal at the low SNR and multipath environment, the blind estimation of parameters is completed by its cyclostationary characteristics. Spectral correlation function[8,9,10] of multipath BOC signal is deduced, and analyze the specific steps of the algorithm. The effectiveness and performance are verified by simulation experiments
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