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)
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)
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)
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)
As one significant component of space environmental weather, the ionosphere has to be monitored using Global Positioning System (GPS) receivers for the Ground-Based Augmentation System (GBAS). This is because an ionospheric anomaly can pose a potential threat for GBAS to support safety-critical services. The traditional code-carrier divergence (CCD)… (More)
validated the tracking scheme.
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)