334 results about "Big Dipper" patented technology

The invention discloses a configurable multi-mode multi-band satellite navigation receiving method and a radio frequency front end module constructed by the method. The front end module can receive signals of satellite navigation and positioning systems such as a global positioning system (GPS), the Big Dipper, a Galileo positioning system and a global navigation satellite system (Glonass), and comprises a configurable low-noise amplifier (LNA) with a buffer and an active balun, a folding passive mixer with a configurable frequency synthesizer, a configurable multi-mode filter, an automatic gain control (AGC) amplifier, a direct-current bias circuit, and a multi-mode multi-band program controlled and coded on-off control word from a receiving system. The radio frequency front end module can meet the requirement of multi-band multi-mode work through the control word programmed by the receiving system, has a simple and reliable structure, does not need complicated time division multiplexing control system and off-chip module, has low cost and high flexibility, and improves the noise performance of the radio frequency front end of the whole receiver and multi-mode multi-band signal processing capacity; and a one-channel signal is input into the module, and the module outputs a two-channel differential signal. The receiver can be used for receiving and processing multi-mode satellite navigation signals asynchronously, and receiving and processing satellite navigation signals with the required mode in different time intervals according to the requirement.

The invention discloses an intelligent scenic spot tourist safety service system based on GIS interoperation and LBS. The system comprises a client, a server and a service monitoring center. Based on an automatic and intelligent interoperation protocol and a standard between a GIS server and a LBS mobile terminal, aiming at tourists, the system realizes position association, automatic position state perception, active early warning and concurrent linkage of multiple monitoring means. A safe think tank makes a decision so as to realize bidirectional high-efficiency position safety information interaction of the tourists and a scenic spot and a timely and rapid rescue service. The system is combined with A-GPS or Big Dipper, a base station and a WiFi positioning mode to acquire accurate position information of the tourists and working personnel in the scenic spot. On an aspect of a GIS interoperation server, an intelligent and automatic GIS space analysis algorithm is designed. A mobile terminal uses an APP to acquire a function support of the server. Precision and efficiency of safe monitoring and early warning of the scenic spot are increased; forecasting and early warning are performed; accident rescue work of the personnel in each scenic spot is scientifically guided and tourist safety is guaranteed.

The invention discloses a compatible navigation receiver positioning system and a positioning method thereof. The system comprises a parameter configuring module, a data preprocessor, a satellite parameter calculating module, a pseudo-distance modifying module, a coordinate conversion module, a positioning calculating module, a kalman filter and a message forming module. The positioning method comprises the steps of: reading a configuration parameter of a receiver; extracting ephemeris data, almanac data and observation data; obtaining parameter information of effective satellites; obtaining the position of the receiver and the speed of the receiver; and generating a message by the navigation information. The invention realizes alternative use of the global positioning system, the independent navigation of the second big dipper navigation system breaks away from the dependency to the other navigation systems at emergency period, and the combination of the many satellite navigation systems increases the quantity of the effective satellites, so as to guarantee the continuity, the usability and the security of satellite positioning service, enhance the geometric figure intensity of the observation satellites, and improve the reliability of the whole global positioning system.

The invention relates to marine hydrology parameter monitoring, and particularly discloses an optical fiber temperature-depth diving mark continuous measuring system. The system comprises a communication buoy, a main floating ball, an instrument bin, a demodulating system, a temperature-depth chain, a mooring rope, an acoustical releaser and an anchoring weight, wherein the communication buoy comprises a solar cell, a big dipper communication plate card and a satellite combined antenna; the demodulating system comprises a demodulation module and a lithium battery and is arranged in the instrument bin, and the temperature-depth chain integrates a temperature sensor and a pressure sensor for measuring temperature and pressure, and the communication buoy, the main floating ball, the instrument bin, the temperature-depth chain, the releaser and the anchoring weight are successively connected through the mooring rope. The optical depth diving mark continuous measuring system provided by the invention has the advantages that the high density, real time, continuation and long-term observation of a temperature-depth vertical section from a sea surface to 500m underwater are realized, the data is exact and reliable, and the economic benefit is high; the optical fiber temperature-depth diving mark continuous measuring system is widely applied in different marine observation operations and provides a novel observation means for measuring sea temperature-depth.

The invention relates to an unmanned plane detection system for road segment congestion alarming. The detection system comprises a wireless communication interface, an aerial camera, an image processing device and a digital signal processor. The wireless communication interface is used for receiving Big Dipper locating data of a target road segment and receiving road segment congestion alarm signals. The Big Dipper locating data of the target road segment are used for driving an unmanned plane to fly to the position over the target road segment. The aerial camera is used for shooting road segment images of the target road segment. The image processing device is connected with the aerial camera so as to process the road segment images. The digital signal processor is connected with the image processing device so as to determine whether to send out a congestion alarm signal according to an image processing result of the image processing device. The unmanned plane detection system can provide traffic congestion conditions of the target road segment in time and send out appropriate alarm information to a road traffic management department at congestion time.

The invention discloses a method for reducing positioning drift of a Big Dipper satellite navigating and positioning device. The method comprises the following steps: (1) acquiring positioning data received within a certain time period and sequencing the data according to positioning time; (2) calculating the distance between two adjacent positioning points from the first positioning data point, and calculating the running speed of a vehicle according to the time interval between the two positioning points; and (3) deleting the two positioning points if the running speed of the vehicle is over-high and exceeds the possible maximum value in reality. According to the method, the positioning data information in a finally obtained positioning data list is relatively accurate positioning information free of the drift point, the positioning drift of the Big Dipper satellite navigating and positioning device can be reduced and the accuracy of the positioning data can be improved.

The invention discloses a flight monitoring service method and a system thereof. The method is characterized by through a black box of a low altitude flight aircraft, acquiring a position and flight path information of an unmanned aerial vehicle; after carrying out correlation processing, using an unmanned aerial vehicle air traffic control system to send peripheral flight path information of the unmanned aerial vehicle to an unmanned aerial vehicle ground control station. The system comprises a civil aviation secondary radar, a low-altitude radar, radar access equipment, mobile acquisition equipment, an ADSB ground station, mobile conversion equipment, an automatic navigator, a GPS radio station, ADSC information conversion equipment, mobile communication equipment, a Big Dipper airborne navigator, a flight monitoring cloud server and a flight monitoring information application system. The method and the system of the invention have an advantage that dynamic data of an acquired unmanned aerial vehicle flight path, a state and the like can be taken as a monitoring information source and is transmitted to an air traffic control system currently used by military and civil aviation in real time so that a management department can conveniently monitor a flight state of a low altitude airspace unmanned aerial vehicle, and a blind area of current low-altitude spatial domain monitoring is compensated.

The invention provides a multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method which supports the receiving of satellite signals of a GPS (Global Position System), a GLONASS (Global Navigation Satellite System), a Big Dipper navigation system and a Galileo satellite navigation system at present. The invention also discloses a multi-satellite navigation system compatible GNSS signal receiving correlator which comprises N multi-system correlated channels, wherein each multi-system correlated channel mainly comprises a carrier numerical controlled oscillator (NCO), a code NCO, a pseudo-random code generator and an integrating and zero clearing module; each code NCO is used for outputting a pulse sequence for triggering the pseudo-random code generator and also generating square signals with the same rate as subcarrier signals in a BOC (1, 1) signal demodulation mode; each pseudo-random code generator can generate 14 grades of pseudo-random codes at most; and each integrating and zero clearing module has an overflow protection function and improves the reliability. The multi-satellite navigation system compatible GNSS correlator can be compatible with four satellite systems, effectively improves the reliability and the continuity of navigation and positioning and obviously reduces the use risk of single-system navigation.

The invention discloses a dead reckoning-based low-cost Big Dipper and MEMS tight-coupling positioning system and method. Based on the acceleration, the magnetometer and the angular velocity information of an MEMS, the PDR algorithm is implemented. The acquired PDR position and velocity information is combined with the Ephemeris information of a Big Dipper receiver, and then the pseudo range and the pseudo-range rate value of a PDR terminal can be estimated. After that, the above pseudo range and the above pseudo-range rate value are compared with the pseudo range and the pseudo-range rate value that are outputted by the Big Dipper receiver, and the difference values therebetween are adopted as the observed values of a navigation filter. The optimal estimation on the error amount of a combination system is conducted by the filter, and then error-corrected data are obtained. According to the technical scheme of the invention, in an environment wherein a target is moved in such a manner that the signal of the target is decreased significantly or the target has no satellite signal, the target can still be continuously positioned. The invention also provides a federal kalman filter algorithm. The time accumulative error of a traditional inertial navigation system is inhibited, and the stability of the overall system is improved. At the same time, based on the adaptive adjustment algorithm, the soft handoff of the system can be realized in different environments, so that the seamless transition of the positioning effect is realized.

The invention discloses a power network global position system (GPS)\big dipper dual system satellite synchronous clock system. A big dipper GPS is combined with antennas to receive satellite signals. The satellite signals are divided into one channel GPS signals and one channel big dipper signals through a power divider. The obtained GPS signals and the big dipper signals are reference source signals, and the reference source signals and IRIG-B signals are sent to a synchronous clock device, a timing module of the synchronous clock device switches and selects the reference source signals, closed-loop control is carried out on a local oscillator part, and electric power clock signals are output in the end. The passive big dipper time service technique, the high-accuracy phase measurement technique and the multi-channel clock lossless switching technique are utilized to finish and achieve the synchronous clock which uses a big dipper, GPS dual satellite system as time reference. A synchronous clock technique index meets technical parameter requirements of power grid joint debugging to a clock. Technical status that an inland current power grid time synchronizing system overly depends in on a GPS system, and safety and reliability of the power grid time synchronizing system are improved.

The invention discloses a method for realizing high-precision location based on Big Dipper system civil carrier phase combination. The method comprises the steps of calculating the original user position and utilizing the original user position to calculate the GEO superwide lane whole circle ambiguity; taking the integer of the observed quantity of GEO superwide lane combination, calculating the GEO wide lane whole circle ambiguity (img file='DDA00002471851000011.TIF' wi='160' he'='47'/), calculating the error of double difference observed quantity of the GEO superwide lane combination, and determining the searching range of the ambiguity of a GEO wide lane; conducting dimensionality reduction search on the GEO wide lane whole circle ambiguity (img file='DDA00002471851000012.TIF' wi='134' he'='47'/) to obtain the accurate value of the GEO wide lane whole circle ambiguity; selecting an MEO/IGSO satellite to initially calculate the wide lane whole circle ambiguity; utilizing the ambiguity combined relationship between a superwide lane and a wide lane to obtain the double difference ambiguity on a B1 frequency point, a B2 frequency point and an S frequency point; utilizing the sum of the double difference ambiguity on the B1 frequency point, the B2 frequency point and the S frequency point to receive carrier phase of machine measurement and conduct planet base double difference location, and calculating the high precision position of a user. Through the method, the purpose of quick high precision location of Big Dipper carrier phases is achieved.

The invention discloses a sugarcane planting monitoring device based on the big dipper/GIS (geographic information system). The sugarcane planting monitoring device comprises a power supply module, a data collecting module, a communication module, a storage module, a positioning module and an embedded sub system, wherein the data collecting module is connected with the storage module, the storage module is connected with the communication module, the storage module, the communication module and the positioning module are respectively connected with the embedded sub system, the data collecting module is externally connected with an environment monitoring sensor and a soil monitoring sensor, the communication module comprises a big dipper satellite navigation communication chip used for sending communication short messages and an SIM (subscriber identity module) card used for wireless communication of mobile data, the positioning module adopts a big dipper satellite navigation positioning module using the big dipper satellite navigation chip as a core, and the embedded sub system is provided with a sugarcane growth predicating model, a time sequence analysis model and a GIS. The monitoring device has the advantages that the structure is simple, the use is convenient, safety and reliability are realized, and the use cost is low.

The invention provides an SOPC (System on a Programmable Chip) networking based sub-microsecond level clock synchronizing method. The clock synchronizing method comprises the steps of synchronizing UTC (Universal Time Coordinated) of a remote reference primary parent clock with UTC from an external GPS (Global Positioning System) clock or a Big Dipper system clock; synchronizing each node of a local first-level PTP (Precision Time Protocol) domain with the remote reference primary parent clock through a network switching device which supports a transparent clock function; receiving an optimal primary clock from a network at the same level by each Zynq platform based slave clock which supports IEEE158V2 protocol and gigabit Ethernet for time synchronization and frequency synchronization; when a PTP domain at the next level synchronizes with the primary parent clock through a border clock, performing clock synchronization by a primary clock at the upper level; and during the period that the PTP domain at the same level masters an independent clock synchronization control right, selecting the optimal primary clock as the primary clock of the network at the same level through an optimal primary clock algorithm. The invention also provides an SOPC networking based sub-microsecond level clock synchronizing system which adopts the clock synchronizing method.

The invention discloses a rapid ambiguity determination method among network RTK reference stations of a big-dipper three-frequency signal. The method is characterized by firstly, rapidly determining a big-dipper super-wide lane ambiguity; then, using two carrier-wave-phase non-ionosphere combination observation values and the super-wide lane ambiguity to determine a wide lane ambiguity; and then, using Kalman filtering to calculate zenith troposphere delay correction between the phase non-ionosphere combination observation values and the reference stations; and finally, fixing an original ambiguity. The method comprises the following steps of (1) fixing the super-wide lane ambiguity and the wide lane ambiguity; (2) according to the Kalman filtering, estimating two-reference-station zenith troposphere delay and ambiguity floating point solutions of two groups of phase non-ionosphere observation values; and (3) according to a non-ionosphere combination ambiguity and the wide lane ambiguity, fixing the original ambiguity. In the invention, an advantage of the big-dipper three-frequency signal is fully used and the Kalman filtering is combined so as to realize rapid and accurate fixation of the ambiguity among big dipper network RTK three-frequency reference stations.

The invention discloses a time service method using a navigational satellite, which comprises the steps of: starting a time service synchronous operation by a system; firstly acquiring sending time Ti of a navigation message, and synchronizing the current time to hour, minute and second information obtained from the Ti by the system. By adopting the time service method and device, the synchronization time is shortened and the power consumption of a time service receiver is reduced. The invention is suitable for multiple kinds of satellite navigation systems, such as GPS, Big Dipper one-generation navigation satellite, Big Dipper second-generation navigation satellite, GLONASS (Global Navigation Satellite System), GALILEO and other satellite navigation systems. In addition, the invention is also suitable for dual-mode/multi-mode satellite navigation systems and dual-mode/multi-mode hybrid satellite navigation systems.

The invention discloses an inertial navigation assisted Big Dipper single-frequency whole-cycle ambiguity calculation method under the short baseline condition. The inertial navigation assisted Big Dipper single-frequency whole-cycle ambiguity calculation method comprises three steps of firstly conducting grouping difference on Big Dipper observed quantity according to the height of a Big Dipper constellation type orbit, wherein atmosphere delay errors of the Big Dipper observed quantity under the short baseline condition can be effectively eliminated; secondly, utilizing an inertial navigation output attitude matrix to estimate a baseline vector and substituting a baseline vector into a Big Dipper double-difference carrier wave observation equation, utilizing a recursive least-squares method to calculate whole-cycle ambiguity floating point solution and a covariance matrix of the floating point solution, then adopting an improved least-squares ambiguity de-correlation method to fix a whole-cycle ambiguity integer solution; finally, utilizing an inertial navigation estimated baseline vector and a Big Dipper three-difference carrier phase observed value to produce inspection amount so as to judge whether a cycle slip occurs or not, estimating and repairing a cycle slip value if the cycle slip occurs. By means of the inertial navigation assisted Big Dipper single-frequency whole-cycle ambiguity calculation method under the short baseline condition, the calculation speed and accurate of the whole-cycle ambiguity can be effectively improved, and the method is suitable for positioning and attitude fixing of a high-dynamic carrier under the condition of a single-frequency Big Dipper satellite system.

The invention provides a system used for driver remote monitoring and driver abnormity early warning. The system comprises a video detecting machine used for detecting and judging the sight direction of a driver and a GPS/big dipper double-module receiver used for detecting the position of a motor vehicle and the running speed of the motor vehicle. The output end of the video detecting machine and the output end of the GPS/big dipper double-module receiver are electrically connected with the input end of a processor used for processing data and judging the attention of the driver. The output end of the processor is electrically connected with a warning device. The invention further discloses a method for remote monitoring and abnormity early warning. The sight direction of the driver is collected and detected through the video detecting machine, the position and the running speed of the motor vehicle are collected through the GPS/big dipper double-module receiver, therefore, judging of the attention states of the driver and detection of the abnormal states of the driver are realized, different warning measures are provided according to different abnormal states, and remote on-way driver real-time monitoring and remote on-way driver abnormity warning are realized. Thus, road traffic accidents are avoided.

The invention discloses a visual water quality information monitoring system based on the Internet of Things and a big data technology. The system comprises a server part, a device layer and a communication layer, and the server layer is a PC terminal and is composed of a plurality of servers; the device layer comprises a water quality monitoring sensor, an underwater imaging system, an underwater unmanned aerial vehicle, an unmanned ship, a Big Dipper/GPS positioning device, a solar battery and a power supply management module; the communication layer is composed of wireless communication devices; and the servers respectively realize fixed water quality monitoring and dynamic water quality monitoring. The system can realize the all-weather remote three-dimensional automatic monitoring of the monitored water quality, can completely record the dynamic change process and the visual display of the water quality data of every monitoring point, provides analysis data, and provides a basis for decision makers. The system can preserve and analyze a large number of water quality data, and can be effectively used in the fields of marine environmental monitoring, pollution monitoring and tracing, and aquaculture detection.

The invention discloses a method for capturing weak signals of a Big Dipper D1 satellite navigation system. The method comprises the steps of: a. estimating a signal-to-noise ratio of a signal; b. utilizing the signal-to-noise ratio to set a signal detection threshold value and judging the weakness; c. selecting an NH secondary coding sequence and carrying out two-dimensional capturing processing of a CA code phase and a Doppler frequency; d. utilizing lms coherent integration and collecting twenty integration results; e. selecting a first type of the NH secondary coding sequence and gradually multiplying with the twenty integration results; f. carrying out non-coherent integration and storing the result; g. repeating the steps c-d until the twenty types of NH secondary codes are traversed; h. selecting the maximum value of the twenty types of integration and comparing the maximum value with a set signal detection threshold value to obtain whether a positioning satellite signal exists in a received signal or not; i. if so, positioning; when the signal is not found, replacing Doppler frequency sections until all the Doppler frequency sections are traversed; and j. replacing a satellite and repeating the steps c-i. According to the method disclosed by the invention, the NH secondary codes can be stripped to obtain a high-integration gain, so that the weak signals of the Big Dipper D1 satellite navigation system are captured.

The invention provides a handheld dual-mode miniaturized user machine antenna. The antenna comprises a bottom plate (1), feed networks (2), a B3 frequency band circularly polarized antenna body (3), an L frequency band circularly polarized antenna body (4), an S frequency band circularly polarized antenna body (5) and feed probes (6). Ceramic substrates with different thicknesses and dielectric constants are adopted for the circularly polarized antenna bodies, a deformed square patch with a radial band line is printed on each substrate, and a coaxial superposition laminated structure is formed by the three circularly polarized antenna bodies from top to bottom according to the working frequency from high to low. The three frequency band antenna bodies are connected with respective feed networks through the feed probes, and the bottom plate and a feed network plate are fixed; three radio-frequency connectors are arranged below the feed network plate, connected with feed network radio-frequency outlets of the three frequency band circularly polarized antenna bodies respectively and led out through three holes below the bottom plate. The handheld dual-mode miniaturized user machine antenna can be compatible with the L frequency band and the S frequency band of the first Big Dipper generation and the B3 frequency band of the second Big Dipper generation, is smaller in size compared with an existing handheld antenna and can be used for military handheld navigation equipment.

The invention provides a communication method for an unmanned aerial vehicle, which comprises the steps of (A) periodically detecting the signal strength of a mobile communication link, (B) detecting whether the unmanned aerial vehicle needs to transmit data, and (C) selecting the mobile communication link and/or a big dipper short message communication link to transmit the data based on the periodically detected signal strength when the data needs to be transmitted.

The invention discloses a ship monitoring and managing system and method for submarine pipeline maintenance. The system comprises a monitoring centre, an AIS (automatic identification system) base station, a patrol ship, a satellite communication link and an optical cable communication network, wherein the satellite communication link comprises a communication link between the Big Dipper satellite or maritime satellite and a satellite receiving station; the AIS base station receives the information of surrounding ships and transmits the information to the monitoring centre; the patrol ship is equipped with an AIS receiver and a satellite data emitter for monitoring surrounding ships and transmitting the monitored ship information back to the satellite receiving station through the satellite communication link; and the satellite receiving station transmits the data to the monitoring centre via an optical cable. A maritime optical cable/cable route is protected by applying the system or method provided by the invention. The monitoring centre can actively schedule patrol ships in time to drive away illegal ships or to guard in dangerous areas by macro-controlling general security of the maritime cable route.

The invention provides a miniature TCAS (Traffic Collision Avoidance System), which is a miniature multifunctional TCAS realized based on a microprocessor and an FPGA (Field Programmable Gate Array) as well as special software. Four devices of the TCAS, two S-mode responders, a control box and a display of systems of the TCAS II are integrated into a whole, thus a bus is reduced, and the transmission of a large quantity of high-frequency signals among the devices is avoided. The system can be linked with navigation systems (such as devices of Big Dipper, GNSS (Global Navigation Satellite System), GPS (Global Positioning System), inertial navigation, tactical air navigation system and the like) directly, and accurate navigation data are used for replacing or correcting the direction and distance data measured by using the original TCAS II, thus more accurate and reliable avoidance decisions are obtained. The novel TCAS has the advantages of small volume and light weight, and integrates all functions of the four devices of the TCAS II; and the volume and the weight of the novel TCAS are below 1/3 that of the TCAS II.

The invention relates to a multi-information fusion and wireless transmission system based on a GIS platform, which belongs to the technical field of information system, wherein position information of a target is acquired by a GPS or an external big dipper system; the included angle of the target and the due north direction is indicated by an electronic compass; the target is subjected to image pickup by a high-resolution camera; sound information generated by the target is acquired by a sound pick-up; various messages of the acquired target are subjected to fusion processing; an electronic map is edited; proper graphic symbols are marked on the electronic map which is updated in real time; as for various target primitives after fusion processing, a regional situation map is formed by taking regions as a unit; in order to reduce the data quantity, the regional situation map is drawn by an independent map layer and stored in a file format; and the generating time of the situation map is taken as a filename, and the file is transmitted to an information center by wireless technology. The multi-information fusion and wireless transmission system based on the GIS platform can realize teletransmission through a relay, and is suitable to be used in situations such as wild mining, anti-terrorism, patrol, monitoring and reconnaissance.

The invention discloses a method for high-precision dynamic point positioning through a big dipper double frequency receiver.Double frequency high-sampling-frequency big dipper data is utilized, only one big dipper double frequency receiver is needed, it is not required to erect a base station or a CORS system or other auxiliary devices at a known point, error sources are eliminated or weakened through algorithms, an iteration least squares elimination method is used, a kalman filter based on single difference ambiguity and troposphere delay parameters is used for parameter calculating, an accurate absolute coordinate position can be obtained, working employment is easy and convenient, the positioning precision is high, the position of a satellite is conveniently locked, and the method is suitable for large working range applications.