CAJ | 학술논문

文中针对分别接收两路相同的卫星信号并对其进行合成的问题,提出了一种适用于高数据速率卫星通信的空间分集信号合成方法.它采用离散傅里叶变换的方法,将时域中的积分运算转化为频域的乘积运算,再通过傅里叶反变换求出其最大值和最大值的位置,实现了时差的估计.仿真结果表明,通过该时差消除方法获得的合成效果,与理论值相比存在0.3dB的损失,但系统仍能在信噪比是3dB的条件下正常工作.该时差消除方法可应用于高数据速率的X频段卫星通信中.
문중침대분별접수량로상동적위성신호병대기진행합성적문제,제출료일충괄용우고수거속솔위성통신적공간분집신호합성방법.타채용리산부리협변환적방법,장시역중적적분운산전화위빈역적승적운산,재통과부리협반변환구출기최대치화최대치적위치,실현료시차적고계.방진결과표명,통과해시차소제방법획득적합성효과,여이론치상비존재0.3dB적손실,단계통잉능재신조비시3dB적조건하정상공작.해시차소제방법가응용우고수거속솔적X빈단위성통신중.
@@@@Aiming at the problem of respectively receiving two way the same satellite signal and carrying on the synthesis,propose a meth-od of time delay elimination for space diversity signal combination which could be applied in satellite communication with high data rate. By DFT method,transfer integration of time-domain into product of frequency-domain,again through IDFT find out the maximum value and the location of the maximum,realizing the time-delay estimation. The simulation results show that,by the time difference method for eliminating obtain the synthesis effect,compared with the theoretical value has 0. 3dB loss there,but the system can still work under the condition of the signal-to-noise ratio is 3dB. This method can be applied to high data rate X band satellite communications