在地球物理随机过程的测量中,由于测量仪器本身的不稳定及外界的干扰等原因,使测得的记录出现明显偏离记录零线的趋势,或出现与测量对象周期不吻合的长周期振荡,例如在风浪的测量中,受到长周期涌、船行波、潮波等影响,使测量中掺入了一些研究中不需要的信息,所以必须把这些趋势项予以消除。消除趋势项是随机数据处理中 In the measurement of geophysical stochastic process, due to the instability of the measuring instrument itself and interference from the outside world, the recorded records are obviously deviated from the trend of the recorded zero line or there is long-period oscillation that does not coincide with the period of the measurement target, For example, in the measurement of wind and waves, influenced by long period surges, ship traveling waves and tidal waves, some unnecessary information is incorporated into the measurement, so these trend items must be eliminated. Eliminating trend items is in random data processing