upstream range的意思|示意

As for the receiving system, as long as the receiving frequency search will extend to the upstream channel frequency range of it.

至于接收系统，只要将接收频率搜索范围扩大到上行信道频率范围就可以了。

The experimental results also show that the optimum effective position range was found to be 2H to 5H of micro vortex generator height upstream of baseline separation.

适宜采用微型涡流发生器对超临界翼型边界层分离进行控制，其最佳位置应在分离线前2~5H涡流发生器高度之间。