首页>
外国专利>
Method and apparatus for compensating Doppler shift in a satellite mobile telephone system
Method and apparatus for compensating Doppler shift in a satellite mobile telephone system
展开▼
机译:在卫星移动电话系统中补偿多普勒频移的方法和装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
An encoded marker is transmitted as a paging signal for mobile satellite telephones. The signal is susceptible to Doppler effects, and the processing procedures are arranged to determine the Doppler characteristics of subsequent signals. The marker takes the form of a first frequency sweep occurring in a first direction followed by a second frequency sweep occurring in the opposite direction. The markers are correlated against sweep signatures to produce amplitude peaks. The mid-point between the peaks and the spacing between the peaks allows timing offsets and frequency shifts to be accurately calculated, thereby facilitating the processing of subsequent data signals.
展开▼