中文摘要：

针对精密多波束测量中多波束系统与GPS系统间存在时间延迟的问题，提出了两种确定时延的方法，即坐标匹配法和竖向时序相似法。前者需根据NMEA0183电文和NAV电文中坐标对及其对应时标确定时延；后者根据GPS与heave呈现船体垂直运动时序的一致性，通过质量控制、姿态改正和垂直运动波形的相似性来确定时延。两种方法在时延确定中均取得了较高的精度。

英文摘要：

Time delay between GPS system and MBS is found in precise multibeam surveying. We present two kinds of methods for the determination of the time delay. One is the position match; the other is the consistent vertical motion method. For the first method, time delay is determined and calculated by comparing corresponding position in NMEA-0183 file telegram and NAV file formed by MBS for navigation in MBS surveying. For the latter, based on the vertical motion consistency in monitoring vessel motion, time delay is determined by the quality control of original data, altitude correction and the determination of maximum comparability of two vertical motion waves. The two methods were tested by a few experiments and proved to be accurate and credible in the determination of time delay.