求翻译：空间段卫星接收地面控制系统上注行入的导航电文及参数，并且连续向地面用户发播卫星导航信号，用户接收到至少四颗卫星信号后，进行伪距测量和定位解算，最后得到定位结果。同时，为了保持地面运控系统各站之间时间同步，以及地面站与卫星之间时间同步，通过站间和星地时间比对，完成地面站间和卫星与地面站间时间同步。分布国土内的监测站负责对其可视范围内的卫星进行监测，采集各类观测数据后将其发送至主控站，由主控站完成卫星轨道精密确定及其它导航参数的确定、广域差分信息和完好性信息处理，形成上行注入的导航电文及参数。是什么意思？

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space segment Satellite Ground Control system on line in the navigation message and parameter, and the ground User The Broadcast Satellite navigation signal, the user receives a minimum of 4 satellites, and the measurement and positioning the solvers, and finally get the results. In order to maintai

Note on the space segment satellite ground control system into the navigation message and parameters, and continuous to ground broadcasting satellite navigation signals made by the user, after the user has received at least four satellite signals, pseudorange measurements and positioning solution, f