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中文摘要：
本文简要介绍了星地无线电双向时间比对法的基本原理，给出其地心惯性系中计算模型，分析了各种误差源对星地间相对钟差的影响，计算了在几种计算精度下卫星和地面站位置和速度误差所需要达到的精度。结果表明：影响星地无线电双向法精度的主要误差源为设备时延误差和电离层延迟误差，而由于卫星和地面站位置不准确引起的误差相对较小；对于电离层时延、设备时延等与信号传播频率有关的时延项，并不能通过差分完全消除它的影响，还需要通过其改正模型来对它的影响进行改正；对于目前时间比对法各误差源的精度量级，星地无线电双向法的理论精度也仅能达到约几百个皮秒的量级。
英文摘要：
The basic theory of the method of two-way satellite-ground time comparison by wireless radio was briefly introduced in the paper, the computational model in the earth-centered inertial reference frame （ECI） was given, and the influences of all kinds of error sources to the relative clock bias of satellite-ground were particularly analyzed. The accuracy of the location and velocity of the sat- ellite and ground-station that should be achieved in lns, 0. Ins, 10ps, lps computational precision were computed. The results showed that the main error sources to affect the precision of the method of two-way satellite-ground time comparison by wireless radio were the equipment time delay and the ionosphere time delay, and the errors aroused by the position inaccuracy of satellite and ground- station were relatively smaller; the influences of the ionosphere time delay and the equipment time delay which are relevant with the signal transmission frequency could＇t be completely eliminated by difference method, and these influences must be corrected by their correctional models; the quantity degree of the theoretical accuracy of the method of two-way satellite-ground time comparison by wireless radio was merely about hundreds of ps for the present error sources precision of the time comparison methods.
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