7 results about "Pseudolite" patented technology

The application relates to a space-ground integrated Beidou high-precision positioning method applied to an urban canyon, and belongs to the technical field of navigation and positioning. The method comprises the following steps: deploying a pseudolite base station, calibrating the base station coordinates through carrier phase difference, and monitoring the number of visible Beidou satellites; determining a master pseudolite, broadcasting timestamp and ephemeris data to a slave pseudolite through a Beidou short message, and combining two-way ranging data to correct a local clock to realize high-precision synchronization; then a user terminal receives Beidou and pseudolite signals, screens effective observation values through a shielding discrimination mechanism, combines pseudolite reference differential data into a non-difference observation equation, and solves a fusion result through a loose-tight coupling mode; finally, the pseudolite double-antenna is used to identify multipath interference, historical data is called to construct an error model, and the fusion result is corrected. The space-ground integrated fusion positioning of Beidou and pseudolites in the urban canyon scene is realized, stable centimeter-level positioning precision is output, and the high-precision positioning demand of urban traffic and surveying and mapping is met.

This invention provides a method, system, and device for deformation monitoring at indoor monitoring points, applied in the field of communication technology. The method includes: receiving a monitoring station and a reference station respectively analyzing and processing preset BeiDou signals emitted by each pseudosatellite to obtain and transmit first target analytical parameters and second target analytical parameters; determining a double-difference observation equation based on the target analytical parameters among multiple pseudosatellites, the approximate coordinates of the monitoring station, and the calibration coordinates of the reference station; fixing the double-difference integer ambiguity of the double-difference observation equation for each epoch to obtain the target integer ambiguity corresponding to the double-difference observation equation for each epoch; solving the double-difference observation equation based on the target double-difference ambiguity to obtain the target monitoring coordinates corresponding to the monitoring station within a preset time period; and determining the displacement of the target monitoring point based on the target monitoring coordinates. This invention achieves millimeter-level precision deformation monitoring of monitoring points in indoor or shaded environments.

The application discloses a pseudolite navigation message management method, system, device and storage medium. The method comprises the following steps: obtaining a navigation message request of a pseudolite positioning system based on a preset communication protocol; generating a first navigation message according to a navigation message type in the navigation message request; and sending the first navigation message to a running control system in the pseudolite positioning system based on the preset communication protocol, so that the running control system sends the first navigation message to a terminal for positioning. In this way, the required navigation message is flexibly configured for the terminal of the pseudolite positioning system according to the navigation message type requested by the pseudolite positioning system. Meanwhile, the first navigation message is sent to the running control system in the pseudolite positioning system based on the preset communication protocol, and the terminal obtains the first navigation message from the running control system, that is, the terminal obtains the first navigation message through a network transmission mode. This mode shortens the time for the terminal to capture the first navigation message, and thus accelerates the initial positioning of the terminal.

The application relates to a Beidou indoor positioning system based on pseudo-satellite positioning information fusion correction, which comprises a positioning pseudo-satellite and an auxiliary positioning module arranged in an indoor environment, the positioning pseudo-satellite is used for receiving a Beidou satellite positioning signal to obtain first positioning coordinates; the auxiliary positioning module receives the Beidou satellite positioning signal to obtain its own coordinates, obtains the geometric spatial position coordinates of a positioning target through visual positioning, takes the own coordinates of the auxiliary positioning module as a reference, combines the geometric spatial position coordinates of the positioning target to obtain second positioning coordinates, and corrects the first positioning coordinates based on the second positioning coordinates to obtain target positioning coordinates. The application combines the positioning pseudo-satellite and the auxiliary positioning module to realize indoor target high-precision rapid positioning through video auxiliary positioning, solves the problem of indoor high-precision positioning of a power station house, carries out space-time fusion correction with outdoor Beidou positioning, obtains high-precision position parameters, and realizes the continuity of indoor and outdoor positioning results.

The embodiment of the application discloses an indoor positioning method, device, mobile terminal and storage medium, the method comprises: predicting the state of the mobile terminal at the target time based on acceleration and angular velocity, obtaining first state information; height estimation is carried out based on acceleration and first height, and second height is obtained; the first state information is corrected based on the first height, the second height and the pseudo-range observation value, and the second state information is obtained; indoor positioning is carried out based on the second state information and indoor map information. In this way, the accuracy and reliability of indoor positioning by the pseudolite are improved by fusing the multi-source data collected by the sensor system. Especially, the second height (fusion of the acceleration measured by the accelerometer and the first height measured by the barometer) can compensate for the adverse effects of the large vertical geometric dilution of precision of the pseudolite layout on height positioning, improve the accuracy of height estimation, and thus improve the accuracy of floor positioning.

This invention discloses a high-security ranging code design method based on a pseudosatellite system. It utilizes a Legendre polynomial sequence based on quadratic residue theory, incorporating truncation point parameters and phase difference parameters. A Weil code is generated through a shift-and-XOR operation. The generated Weil code sequence is then used to generate the primary ranging code sequence through cyclic truncation and splitting operations. A periodic code-changing scheme is introduced to further enhance the security of this code sequence. This invention improves the security performance of the ranging code without significantly affecting its correlation, making it more suitable for scenarios with high confidentiality and correlation requirements.

The application discloses a tunnel cooperative fire extinguishing system and method based on degradation perception and cascade relay, and belongs to the field of unmanned aerial vehicle emergency rescue and multi-sensor fusion navigation. The tunnel cooperative fire extinguishing system comprises a portable ad hoc network pseudolite base station network, a cascade relay module, a cooperative fire extinguishing flight platform, a multi-modal perception module and an airborne degradation perception and cooperative computing platform. The tunnel cooperative fire extinguishing method comprises the following steps: base station deployment and coordinate system initialization; multi-modal data acquisition and degradation detection; cascade relay air drop based on signal gradient and degradation state; adaptive weight navigation based on degradation perception; end cooperative fire extinguishing; and end cooperative fire extinguishing. The application realizes reliable extension of navigation and communication and cooperative fire extinguishing of aircraft and missiles in a tunnel smoke and satellite signal-free environment, and has the characteristics of strong anti-degradation capability, unlimited link extension, low cost and high fire extinguishing efficiency.