Research And Implementation Of Pseudo-Satellite Indoor Navigation Based On RSSI

GPS is a Global Positioning System established by the US Department of Defense,which has high positioning accuracy,wide application range,limited conditions and other characteristics,so has been widely used.Most positioning navigation devices are equipped with GPS navigation module,but the GPS signals cannot reach the interior,causing the system unusable.This article has studied this,through the pseudo-satellite launches the same satellite signal as the outdoors,uses the basic data which the common receiver can output,achieves the purpose of the indoor and outdoor seamless navigation.At the same time,it is assisted by the use of pedestrian dead reckoning to meet the positioning needs of large indoor areas.The paper mainly includes the following aspects:Firstly,the requirements of indoor navigation and the significance of research are discussed.In addition,the article analyzes the current popular indoor positioning technology principles and compares their advantages and disadvantages.Secondly,this article introduces the principle of GPS navigation and the problems existing in indoor positioning,explores the estimation method of carrier-to-noise ratio in GPS receivers,the entire process of positioning using the carrier-to-noise ratio is described in detail,and the data is compared with Wi-Fi.At the same time,in the case of weak GPS signals,the use of pedestrian dead reckoning for assisted positioning is considered.Three key factors in pedestrian dead reckoning: step number,step length,and angle are discussed.Obtain actual measurement data for positioning accuracy analysis.Finally,there are three sub-systems of the entire indoor navigation system: pseudosatellite,management center,and mobile terminal.From the design requirements,this paper analyzes the functions that need to be realized.The design of the management center software is described in detail,including the formulation of data transmission protocol and the research of satellite selection strategy.What’s more,the scenario of user searching for cars is assumed,and the development of mobile terminal navigation software is introduced.The main functions and implementation methods of navigation software are introduced,and the final positioning effect is demonstrated.