The width of sailing track is large in the incurvate channel,so...

船舶(队)转弯时的航迹带要宽,因此不应有转弯段等航速会船。

According to the problem of position discontinuity using GPS in city cars, a scheme that GPS is combined with DR which is composed by piezoelectric gyro and milemeter is put forward.

针对城市车辆全球定位系统(GPS)定位存在的不连续性问题,提了采用压电陀螺和里程仪组成的低成本航迹推算系统与GPS组合方案。