<h2>AAS 97-130</h2>
<h2>ON THE APPLICATION OF GRAVITY GRADIOMETER FOR INERTIAL  NAVIGATION SYSTEM                                                                        </h2>
<h4> H. Shingu, National Aerospace Laboratory, Japan                                                                                                                          </h4>
<h2> Abstract </h2>
 Availability of a new-type of strapdown inertial navigation system using gravity  gradiometer is discussed.  Analytical solutions of gravity gradients are derived as  second order spatial gradients of the gravitational potential in a conservative  field.  Next, the process of obtaining the gravitation accelerations from the  measured data of gravity gradients is analytically shown.  Also, a method for  calculating the influence of a gravity variation to the trajectory of the vehicle  is shown.  The performance of the gravity gradiometer using current techniques is  demonstrated based on the quantitative evaluation of the navigation errors owing to  the gravity variation.