33results about How to "Positioning results are stable" patented technology

The invention discloses a 125k-based analog reference label positioning system and a method thereof, comprising a 125k positioning base station, a server terminal and a network switch, and the 125k positioning base station is connected to the server terminal through the network switch. The steps include an offline training phase and an online calculation phase, the offline training phase includes training the RSSI-distance model and generating simulated reference labels. The positioning position of the present invention has little fluctuation, does not increase cost, and has high precision.

The invention discloses an indoor terminal positioning method based on virtual sampling points. The indoor terminal positioning method comprises the following steps: collecting and filtering signal strength of a terminal; judging which AP (access point) wins fast to realize fast positioning of the AP when the terminal is very close to the AP, wherein if a certain AP receives the signal strength of the terminal, which is larger than a set threshold value, the AP is considered to win fast, and then outputting the position of the AP as a positioning result; executing the similarity matching process of the virtual sampling points, and selecting the sampling point as the positioning result if a certain virtual sampling point wins; executing weight matching of the virtual sampling points, and selecting the sampling point as the positioning result if a certain virtual sampling point wins; and otherwise, keeping the position of terminal unchanged. The logic relation between the position in an actual environment and the AP in a WIFI (wireless fidelity) environment is in correspondence through the virtual sampling points, and the virtual sampling points are used as positioning datum points for indoor positioning, thereby avoiding the sampling work for sampling positioning and improving the capability of responding to the changes in the environment.

The invention discloses an indoor and outdoor integrated positioning and navigation method and its system, which relate to the field of positioning fusion; the method includes step 1: acquiring GPS, Bluetooth and inertial positioning data; step 2: positioning data through adaptive weighting and Kalman filtering and complete the positioning calculation based on distance correction to obtain the final positioning point; step 3: divide the navigation line into a point set to obtain the reference point for projection calculation, and use the sliding window and curve geometric projection to project the final positioning point onto the navigation line The reference point to obtain the projection point; step 4: use the projection point for navigation and map display. The present invention adopts adaptive weighting and Kalman filter model to obtain smooth positioning results, corrects the results based on distance, obtains stable and accurate positioning, and overcomes the calculation amount caused by the fusion of inertial positioning, Bluetooth positioning and GPS positioning. Difficulties in real-time and stability, to achieve smooth indoor and outdoor integrated positioning and navigation.

The invention discloses a baseband module of a GPS (global positioning system) receiver and a GPS signal acquiring and tracing method. The baseband module comprises an acquiring and tracing module, a synchronization and navigation message extraction module, a satellite selection calculation module, an observation amount calculation module, an error correction module and a navigation location resolution module which are connected with one another in sequence, wherein the acquiring and tracing module is connected with an RF (radio frequency) front-end circuit. Based on a rapid acquisition algorithm and a high-sensitivity carrier tracing technique, the baseband module can be used for achieving weak signal GPS location in high-noise environment. The baseband module is suitable for all types of GPS location equipment.