Ship heave measurement method based on adaptive time-delay-free complementary band-pass filter

The invention discloses a ship heaving measurement method based on an adaptive time-delay-free complementary band-pass filter, which belongs to the technical field of inertial navigation measurement, is used for ship lifting measurement, and comprises the following steps of: obtaining a value with power spectral density tending to be gentle and a frequency corresponding to the value according to a statistical method and a nearest neighbor method so as to obtain a stop-band bandwidth; according to the center cut-off frequency and the stop-band bandwidth, calculating to obtain a lower cut-off frequency and an upper cut-off frequency, and taking the low-pass filter as a medium to obtain a transfer function of the band-stop filter; and according to a complementary principle, a non-delay complementary band-pass filter transfer function is obtained, and then the heaving acceleration is subjected to filtering and quadratic integration to obtain the ship heaving amount. According to the method provided by the inventi