Analysis on the influence of the INS precision in an ultra-tightly coupled INS/GPS integration

In order to construct the INS/GPS deep integrated navigation system with different accuracy requirements, the influence of inertial navigation system on the accuracy of inertial navigation system is studied. In an INS/GPS deep integrated navigation system, the extent of the reduction of the Doppler frequency search range of satellite receiver, the improving degree of acquisition sensitivity of the satellite receiver, and the effective time of the satellite receiver, are quantitative analyzed under the aiding of kinds of INS with different precision.