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GNSS is capable of providing high-precision and drift-free attitude information. The traditional attitude determination methods based on the baseline vector and carrier phase measurement process attitude determination estimation and ambiguity resolution sequentially. And the redundant measurements from multi-baselines have not been fully utilized. A GNSS measurements based attitude determination method...
In China, with sharply increasing of aged population, elderly safety issue causes more and more social attention. Elderly people living alone may be faced with accidents. In order to help them timely contact with their family members, some manufactures offer a kind of mobile phone with shortcut keys function. However many incidents remain unprepared to the elder and their families, the consequences...
Because of the loss of availability in the traditional integrity monitoring algorithm, a solution separation RAIM (Receiver Autonomous Integrity Monitoring) scheme based on adaptive clock-bias model with flexible smoothing window is presented. The proposed CASS (Clock-bias Aided Solution Separation) RAIM improves the availability of integrity monitoring by the means of adjusting the smoothing time...
The fast acquisition algorithms for high dynamic GPS signals was analyzed, and the result indicated that the fast Fourier transform (FFT) played an important role in both the segment correlation algorithm and the fast acquisition algorithm based on FFT. So improving the efficiency of FFT can be significantly better the performance of GPS receivers. Considering the pros and cons of the FFT processing...
Though the traditional Hatch filter can be used to improve positioning accuracy by reducing receiver noise in code pseudorange, the filtered errors could diverge because of the effects of ionosphere and multipath. Based on analyzing the positioning error caused by ionosphere temporal and spatial gradients and multipath effects, a novel algorithm to design the adaptive Hatch filter with optimal weighting...
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 signals carrierpsilas high dynamic movement....
People pay more and more attention to the issue of GPS (global positioning system) anti-jamming nowadays, and the research on blind GPS anti-jamming receiver has more practical significance. Aiming at this, a technique of blind GPS anti-jamming receiver based on constant modulus (CM) array is analyzed in detail, in which the CM property of GPS signal is utilized, and the paper specially gives the...
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 experiment. The paper designs a sea experiment...
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