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To overcome the effect of temperature on laser gyro zero bias and to stabilize the laser gyro output, this study proposes a modified radial basis function neural network (RBFNN) based on a Kohonen network and an orthogonal least squares (OLS) algorithm. The modified method, which combines the pattern classification capability of the Kohonen network and the(More)
With the modernization of global navigation satellite systems (GNSS), secondary codes, also known as the Neumann-Hoffman (NH) codes, are modulated on the satellite signal to obtain a better positioning performance. However, this leads to an attenuation of the acquisition sensitivity of classic integration algorithms because of the frequent bit transitions(More)
This paper demonstrates an immediate frequency (IF) GPS signal simulator design scheme and some signal synchronize techniques on high dynamic environment. It is based on a mathematical signal model which expresses the digitized IF GPS signal as a function of various errors during propagation. The simulator is able to simulate more than 12 GPS satellite(More)
Sea experiment is the last link before inertial navigation system (INS) is put into use formally. It is designed with meticulous care to imitate actual application environment for testing a new product whether it matches given technical specification and actual application requirement. The INS shouldn't be put into service unless it has passed the sea(More)
This work presents a coherent vector tracking loop (CVT) for BDS signals based on cascaded filters. The structure of CVT is based on extended Kalman filters (EKF), including several local filters and a common navigation filter. A fault detection and exclusion algorithm (FDE) integrated to the tracking loop is introduced. This FDE method is used to detect(More)
Real-time single frequency precise point positioning (PPP) is a promising technique for high-precision navigation with sub-meter or even centimeter-level accuracy because of its convenience and low cost. The navigation performance of single frequency PPP heavily depends on the real-time availability and quality of correction products for satellite orbits(More)
Due to the complexity of the actual space transmission channel, multipath signals will incident to antenna array, which makes the accurate DOA (Direction of Arrival) cannot be obtained by using some typical DOA estimation method. According to the structure characteristic of the array manifold of multipath signals, this paper propose a new method to estimate(More)