| True wind plays an important role in meteorological navigation for ships sailing on the sea. If the true wind can not be measured accurately, it maybe results in miscarriage of justice for navigators, and then affects the safe navigation of ships. However, the true wind can not be measured directly on ships and other moving platforms, and can only be obtained indirectly by vector model calculation. According to the true wind calculation model and error propagation law, the true wind error model of ship is deduced. In the vector model, the true wind errors of navigating ships mainly come from the measurement errors of ship wind and relative wind. The measurement errors of ship wind are mainly caused by the selection of ship’s speed and course. The measurement errors of relative wind mainly include sensor accuracy, installation error, platform attitude influence and systematic interference error. Taking the steering process of a ship as an example, the variation law of sailing wind and relative wind is analyzed. Combining with the hull motion attitude and adding the motion compensation correction, a real wind compensation model for ship steering is established. |
