多波束测量中换能器瞬时精密高程的确定

Determination of Precise Instantaneous Height at Multibeam Transducer

分析了GPS高程信号和Heave信号的频段特征,利用数字信号处理技术,提取了GPS高程和Heave中的有效频段信号,合成了一个全新的信号。该合成信号能够全面反映多波束换能器的实际垂直运动,并能够克服传统多波束测量和数据处理方法的缺陷,大大提高了多波束在垂直方向的成果精度。实验证明了该方法的正确性和可行性。

In order to improve the shortcoming of the traditional multibeam data processing, a new method, which blends GPS height and heave to present the actual height at transducer, is studied. In the fusion, GPS height and heave need to be corrected to transducer by attitude correction firstly. Secondly, GPS height needs to be checked and modified by heave check and modification itself. In addition, filter methods are studied by comparing Buttworth filter and FFT spectrum analysis, the latter is chosen finally for extracting height-frequency signal from heave and low-frequency signal from GPS height, and blending a new height at transducer. The applications of the method in few experiments prove that it has higher accuracy relative to the traditional.