Research On Multi-mode Wireless Signal Characteristics Analysiss And Test Drive Generation Under Terrestrial Environment

Recent years, with the development of the perfect GPS systems andauxiliary systems as well as related positioning and manufacturingtechnology, GPS not only plays an irreplaceable role in the field of military,professional measuring and timing are also increasingly important in civilianareas. The civilian GPS chip is embedded into the various carriers such asmobile phones and car, providing real-time location information to the user.In order to improve the availability of navigation and positioning to ensurethat obscured the scene can achieve real-time precise positioning in thestreets, the woods, and indoor, indoor and outdoor navigation seamlesscontinuity of the link integrity research increasingly become a hot spot.In this paper, the general’s car and handheld applications, through thestudy of indoor and outdoor navigation signals, the main work is as follows:(1) the establishment of a tracking system based on the extendedKalman filter vector model to derive the analytical expression of the modelparameters. Navigation signal is blocked for some time after recovery again, order tracking loop initialization, the receiver must re-enter the capture stage,while the capture takes a lot of time, and cannot provide continuouspositioning services for these shortcomings, as further improve usernavigation performance of the receiver in the harsh environment, this paperproposed based on extended Kalman filtering vector tracking technology, thetechnology is not to the external auxiliary information to dig throughsoftware algorithms and make full use of the information between thedifferent satellite signals signal tracking and positioning navigation solutionmerged together to improve the ability of tracking the satellite signal receiverfor each channel, so that the vector tracking compared with the conventionaltracking method, and can track the weak satellite signal, the bridge istransiently occluded satellite signal, and endure high dynamic useradvantages.(2) The proposed hybrid algorithm based on the secondary scatteringmodel the base station-satellite. This study in order to ensure the integrity ofthe navigation signal coverage, positioning satellite less than four auxiliaryterrestrial wireless equipment (base station, WIFI CELL-ID, etc.) completethe positioning. Based on the analysis of terrestrial wireless signaltransmission characteristics and geometric dilution of precision (GDOP), thispaper proposes a new satellite-the base station hybrid positioning methods. The method considers the influence of NLOS (NLOS), the scattering body asa virtual base station, modeling analysis NLOS error in positioning due to,and based on the GDOP analysis to select the optimal base station-SatellitePositioning combination, to suppress multipath error, improve the positioningdilution of precision (DOP). In this paper, the algorithm of mathematicalanalysis and simulation show that, compared to traditional hybrid positioning,the method has a higher positioning accuracy and robustness.