WAVELET COMPRESSION OF GRAVITY CORRECTION DATA

摘要

Compressed wavelet transform coefficients are used to correct outputs of inertial sensors for gravitational deflections. The compressed wavelet transform coefficients comprise gravitational deflection data that is first converted to discrete wavelet coefficients by a discrete wavelet transform and that are then compressed to form the compressed wavelet transform coefficients. An inertial sensor signal relating to a first navigational parameter of a vehicle is generated. The compressed discrete wavelet coefficients are accessed from a memory based on a position of the vehicle. The accessed coefficients are decompressed, and an inverse discrete wavelet transform is performed on the decompressed coefficients to produce gravitational compensation data. The sensor signal is compensated based on the gravitational compensation data.