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Inertial navigation system (INS) necessitates an alignment stage to determine the initial attitude at the very start. A novel alignment approach is devised by way of an optimization method, in contrast to the existing alignment methods, e.g., gyrocompassing and filtering techniques. This paper shows that the INS attitude alignment can be equivalently transformed into a “continuous” attitude determination...
The alignment of the airborne gravity system has a high demand of the precision which has an obvious contrary on the alignment time cost. The possibility and feasibility of the alignment using position matching is discussed in depth. Simulation and field data tests show potential of this method for the usage in the static ground case.
This paper discusses the INS aided signal acquisition method based on GNSS software receivers. In order to overcome low dynamics and sensitivity to RF interference which are the two vulnerabilities of GNSS receivers, INS velocity information is used to assist the fast signal search. The research aims at analyzing the acquisition performance varying with dynamics and INS accuracy. The relation between...
Geomagnetic field is one of the geophysical fields of the Earth and can be used to limit the error accumulation of the inertial navigation system (INS). A geomagnetic aided navigation system is proposed in the paper. Two alternate processes are designed in the system - the match and the filter. In the former part, a contour constraint based correlation method is used to eliminate the initial position...
In need of accurate and covert positioning, a geomagnetic surface navigation system is investigated in the paper. The Earth anomaly magnetic field intensity is selected as the reference to bound the INS (inertial navigation system) errors. Using stochastic linearization technique, we have proposed an EKF (extended Kalman filtering) algorithm which is adaptive in two aspects: linearization region size...
Geomagnetism aided navigation (GAN) is a new branch of the integrated navigation technique. The navigation principle and the development of the GAN system are introduced in the paper and the emphasis is laid on the research of the matching method. Geomagnetic matching is the technique that uses a magnetic map to determine the location and the obtained position information can be used to limit error...
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