53 results about "Ground based augmentation system" patented technology

The present invention discloses a building deformation monitoring system and method based on Beidou ground based augmentation. The monitoring system comprises a data collection module, a data transmission module, a data processing platform and a monitoring early warning platform. The data collection module comprises a GNSS antenna, a GNSS receiver and an inclination angle sensor. The data processing platform collects data transmitted by the data collection module in real time by employing the data transmission module, and performs decoding, resolving and storage. The monitoring early warning platform comprehensively analyzes and displays displacement, settlement and inclination deformation information of a building calculated in real time. Therefore, functions such as remote real-time monitoring, real-time analysis and automatic alarm are achieved. The building deformation monitoring system and method based on Beidou ground based augmentation are reasonable in design and clear in structure, can perform automatic monitoring and early warning for building deformation in real time, and employ a Beidou ground based augmentation system base station to provide a reference for real-time difference and resolving service after the event, so that the monitoring efficiency and the position precision are improved, and the monitoring cost is saved.

The invention discloses a method for fixing narrow lane ambiguity of the Beidou ground based augmentation system base station. According to the method, Beidou tri-frequency observed quantity is employed; fixing ambiguity of ultra-wide lane and wide lane in succession; establishing a narrow lane ambiguity multi-path error model; according to the repeatability of navigational satellite orbital period, performing multi-path error model correction to the narrow lane ambiguity sequence of the day to quickly fixing the narrow lane ambiguity, and to quickly obtain high-precision positioning results at centimeter-level.

The invention discloses a GBAS integrity warning threshold estimation method based on a Gaussian expansion method. The method comprises the following steps: calculating integrity sample data accordingto integrity monitoring criteria; then, dividing parameter intervals according to the satellite elevation angle, and calculating mean value and standard deviation of the sample data in each interval;carrying out normalization on the sample data; then, drawing a distribution histogram of the normalized data; and finally, determining the optimal expansion factor through the Gaussian expansion method and generating a warning threshold value. The method meets requirements of a ground-based augmentation system for false alarm rate, and meanwhile, the integrity warning threshold determined throughthe Gaussian expansion method based on system actual data accords with the actual characteristics of the system more.

The invention discloses a wave and tide measuring method based on a Beidou ground-based augmentation system. The wave and tide measuring method based comprises the steps of: installing a GNSS receiver and a differential data communication module in a buoy body; calculating spatial position coordinates of the buoy body through GNSS satellite signals as well as navigation signal correction and auxiliary positioning signals acquired from the Beidou ground-based augmentation system; and calculating wave and tide information in the ocean according to the spatial position coordinates of the buoy body. The wave and tide measuring method based further comprises the steps of acquiring the navigation signal correction and the auxiliary positioning signals, calculating position coordinates of the buoy body, separating the wave information from the tide information, calculating wave parameters and calculating tide parameters. The wave and tide measuring method disclosed by the invention is simple and convenient, is high in wave and tide measurement accuracy, is stable and reliable, and has broad application prospect.

The present invention discloses a navigation augmentation system based on a LEO small satellite. The system comprises at least four ground stations, a LEO small satellite module, an GNSS module and a user terminal. The LEO small satellite module is arranged at the exoatmosphere and is configured to receive navigation signals including atmosphere errors sent by the ground stations over the ground and receive navigation signals without atmosphere errors of the GNSS module in the sky, the differences of the navigation signals of two are compared to obtain the atmosphere delay difference correction near the current position of the LEO small satellite module and broadcast the signals to the ground, and a user terminal receives the atmosphere delay difference correction of the LEO small satellite module so as to effectively improve the navigation location precision. The navigation augmentation system based on the LEO small satellite can improve the receiving speed and the integrity of the navigation information through the user terminal so as to solve the problems that the ground stations of a ground-based augmentation system are easy to be shielded by buildings and disturbed by multiple paths and relieve the satellite-based augmentation service scope limitation.

The invention discloses a method for generating a dual-frequency low-orbit satellite-based satellite navigation augmentation signal. For the disadvantages that the power of a transmitting signal of ahigh-orbit satellite navigation augmentation system is large, the power of a signal reaching the ground is small, a ground station is complex, the communication of a ground-based augmentation system is limited, frameworks are not unified, the concurrence pressure is large, and the maintenance cost is high, the method for generating the dual-frequency low-orbit satellite-based satellite navigationaugmentation signal is proposed. The method is mainly designed and implemented for low-orbit satellite-based satellite navigation augmentation equipment, the low-orbit satellite-based satellite navigation augmentation equipment is composed of a main control extension and a transmitting extension, the main control extension can receive a GNSS satellite navigation signal to complete orbit calculation and extrapolation, star clock taming, telegraph text framing and injection, the transmitting extension performs spread spectrum modulation on a telegraph text and a spread spectrum code, the dual-frequency satellite navigation augmentation signal is generated by designing two sets of transmitting frequencies, the cost is low, the power consumption is low, and the higher positioning precision ofthe satellite navigation augmentation signal is provided.

The embodiments of the invention provide a transmission method and device for a GBAS (Ground-Based Augmentation System) navigation message. The method comprises: ground equipment receives a global navigation satellite system (GNSS) signal; the ground equipment determines a very high frequency (VHF) data broadcast (VDB) message according to the GNSS signal; the VDB message comprises ranging sourceidentifiers and support constellation information; the ranging source identifiers comprise a ranging source identifier of the Beidou satellite and a ranging source identifier of the Galileo satellite;the ranging source identifiers are used for indicating the numbers of the satellites; the support constellation information is used for indicating the supported constellation type; and the ground equipment sends the VDB message to onboard equipment. By adopting the method, the updated VDB message can support GNSS signals of multiple stars including Beidou and multiple frequencies.

The invention belongs to the technical field of satellite navigation, and particularly relates to a method for overcoming a near-far effect by utilizing double antennas in a pseudo-satellite ground-based augmentation system. The method comprise the steps of: arranging the two antennas at the upper end and the lower end of an aircraft respectively, receiving GNSS satellite signals and pseudo-satellite signals from upper and lower spaces respectively by utilizing the signal blocking function of the aircraft, performing RF front-end processing on the signals respectively, and adjusting RF channel gain; detecting the pseudo-satellite signals, adding an acquisition and tracking channel with high threshold, eliminating the near-far effect between pseudo-satellites through suppressing the strong pseudo-satellite signal, and reconstructing the strong pseudo-satellite signal; and acquiring and tracking the GNSS satellite signals and the pseudo-satellite signals, and adopting a double-antenna navigation positioning method for carrying out analysis and position calculation on a navigation message.

The invention provides a method for realizing sub-meter-level positioning at a smart phone and a sub-meter-level positioning type smart phone. With an RTK carrier phase difference technology, a systemerror in a single-point positioning model is eliminated or weakened and position calculation is carried out by using a carrier phase observation value with the higher observation precision to replacea pseudo range, so that sub-meter-level positioning is realized at a smart phone. The method comprises: a mobile communication function module configured at a mobile phone is used for receiving ground station differential data broadcasted b a Beidou ground-based augmentation system and various types of location service networks; original satellite observation data reported by a satellite navigation observation quantity pushing module are obtained in real time; according to the obtained ground station differential data and the original satellite observation data, differential calculation is carried out to obtain a positioning result with the sub-meter-level positioning precision; and the sub-meter-level positioning result is provided for a third-party application program through an application program interface of a mobile phone location management module to realize seamless connection between the high-precision position output and the standard interface of the mobile phone system.

The invention provides a method and device for monitoring the delay integrity of the troposphere. The method comprises the steps: receiving the data information of a plurality of satellites; obtaining the maximum pseudo-range error of the pseudo-range errors of all satellites according to the data information of the plurality of satellites; determining the troposphere horizontal standard deviation of each visible satellite according to the maximum pseudo-range error; calculating and obtaining the troposphere horizontal error of each visible satellite according to the troposphere horizontal standard deviation of each visible satellite; and obtaining the troposphere error of each visible satellite according to the troposphere horizontal error of each visible satellite and the troposphere vertical error of each visible satellite. The method achieves the accurate calculation of the troposphere errors, improves the accuracy of a positioning error correction value obtained by a ground enhancement system, improves the positioning accuracy and integrity of a GPS positioning system when an airplane enters a field and lands, and improves the flight safety of the airplane.

The invention provides a difference positioning testing method and device for a satellite-navigation ground-based augmentation system.The pseudo-range difference testing function and the phase difference testing function are integrated, and meanwhile the positioning resolving results of the pseudo-range difference and the phase difference are output; the provided device is quite convenient to carry, install and use.The device comprises a central processor module, a satellite-navigation difference positioning module, a mobile communication module and a multimedia broadcasting module.The central processor module is respectively connected with the satellite-navigation difference positioning module, the mobile communication module and the multimedia broadcasting module, and used for receiving mobile communication difference data obtained by the mobile communication module or multimedia broadcasting difference data obtained by the multimedia broadcasting module, receiving satellite navigation difference data output by the satellite-navigation difference positioning module, carrying out difference positioning resolving on the mobile communication difference data or the multimedia broadcasting difference data and the received satellite navigation difference data and meanwhile outputting the positioning resolving results of the pseudo-range difference and the phase difference.

The invention provides a method for monitoring the completeness of a ground based augmentation system (GBAS). The method comprises the following steps of: carrying out real-time normalization processing on the carrier to noise ratio of a received satellite navigation signal to obtain a normalized carrier to noise ratio; carrying out real-time time accumulation on the normalized carrier to noise ratio to obtain a carrier to noise ratio accumulated summation of current time; calculating to obtain a current value of a monitoring threshold value according to the noise ratio accumulated summation of current time through a markoff chain; and comparing the noise ratio accumulated summation of current time with the current value, and if the noise ratio accumulated summation exceeds the current value, sending out alarm information. In the invention, a mathematical statistic method of deviation error accumulation is adopted to monitor the carrier to noise ratio of the satellite navigation signal in real time in a process of processing monitoring data of the GBAS carrier to noise ratio completeness, thereby simplifying the calculated amount, realizing the real-time update of the threshold value and improving the precision of a positioning result.

Provided is an apparatus for monitoring an ionospheric anomaly using a Kullback-Leibler divergence (KLD) metric based on a ground-based augmentation system (GBAS) ground system. The ionospheric anomaly monitoring apparatus includes a filter configured to embed a pseudo range measurement value and a carrier-phase measurement value measured at the GBAS, and to provide a KLD metric; and a determiner configured to determine a presence or an absence of the ionospheric anomaly using the KLD metric for GBA.

An aircraft synthetic vision display system (SVS) includes a topographical database including topographical information relating to an airport, a global positioning system receiver that receives a satellite signal from a global positioning satellite to determine a geographical position of the aircraft, and a ground-based augmentation system receiver that receives a ground-based signal from a ground-based transmitter associated with the airport, wherein the ground-based signal includes geographical information associated with the airport. The SVS further includes a computer processor that retrieves the topographical information from the topographical database based on the geographical position of the aircraft, that retrieves the geographical information associated with the airport, and that corrects the topographical information using the geographical information associated with the airport to generate corrected topographical information. Still further, the SVS includes a display device that renders three-dimensional synthetic imagery of environs of the aircraft based on the corrected topographical information.

The invention discloses a method and a system for monitoring troposphere correction parameters of a ground based augmentation system, which belong to the navigation technology field and improve precision, integrity, availability and continuity of the ground based augmentation system. The method comprises: obtaining first meteorological data and second meteorological data at present; correcting the troposphere parameters according to the first meteorological data, so as to obtain a first group of correction parameters; correcting the troposphere parameters according to the second meteorological data, so as to obtain a second first group of correction parameters; comparing the first and second groups of correction parameters with a meteorological statistical threshold, and outputting a third group of correction parameters according to the comparison result; obtaining a correction error according to augmentation data, navigation data and the third group of correction parameters, comparing the correction error with a preset correction error threshold, and giving an alarm and stopping the ground station augmentation service if the correction error is greater than the preset correction error threshold, or else carrying out the ground station augmentation service.

Systems and methods to monitor for false alarms from ionosphere gradient monitors are provided. In one embodiment, a method for mitigating false gradient alarms in a satellite navigation Ground Based Augmentation System (GBAS) ground station comprising a plurality of satellite navigation system reference receivers comprises: generating an alarm signal with an ionosphere gradient monitor (IGM) at the GBAS ground station; determining whether the alarm signal is a false alarm based on data derived from carrier phase measurements received from the plurality of satellite navigation system reference receivers; and blocking the alarm signal for at least a first duration of time based on the determining.

The invention relates to the field of mobile communication, and discloses a communication base station and a beamforming method thereof. The beamforming method of the communication base station comprises the following steps that the base station receives first positioning information based on a satellite navigation system from a mobile terminal; the base station sends a differential positioning request to a ground-based augmentation system of the satellite navigation system according to the first positioning information; the base station performs differential calculation on the first positioning information according to a differential correction value returned from the ground-based augmentation system, so as to obtain second positioning information; and the base station calculates a position angle between the base station and the mobile terminal in three-dimensional space according to second positioning information and known position information of a base station antenna, and forms a directional beam for the mobile terminal in the position angle through the base station antenna. The beamforming method of the communication base station can improve link quality of wireless communication and increase cell throughput.

The present invention relates to a method for improving service reliability of a ground-based augmentation system, comprising the following steps: terminal A sends original observation data and a rough position to the ground-based augmentation system; the ground-based augmentation system generates VRS data and sends it to terminal A; terminal A uses a differential signal Perform relative positioning to obtain precise location information; terminal A sends the precise location information and original observation data to the ground-based augmentation system; the ground-based augmentation system evaluates the quality of the original observation data and VRS data, and selects the best of the two to send to terminal B ; After terminal B receives the original observation data or VRS data of terminal A, it performs relative positioning to obtain high-precision positioning results. The invention improves the utilization rate of observation data, improves the service reliability of the ground-based augmentation system while effectively utilizing the data, and effectively expands the service scope of the ground-based augmentation system.

The invention discloses an agricultural machinery theft prevention method. The agricultural machinery theft prevention method comprises the following steps of obtaining the position, transmitted by asatellite navigation system and a ground-based augmentation system, of an agricultural machinery; according to a preset instruction, setting an area range in an electronic map to form an electronic fence on the basis of the position of the agricultural machinery; and when monitoring that the agricultural machinery is beyond the electronic fence, triggering an agricultural machinery alarming system. The invention further discloses an agricultural machinery theft prevention device and a computer readable storage medium. According to the agricultural machinery theft prevention method and device and the computer readable storage medium, the probability that the agricultural machinery is stolen can be reduced to reduce property loss.

The invention discloses a differential positioning method for a ground-based augmentation system based on extended Kalman filtering. The differential positioning method comprises a carrier phase smoothing pseudorange step and a differential positioning step based on extended Kalman filtering. The carrier phase smoothing pseudorange step is implemented by judging whether a carrier phase has a cycleslip according to a carrier difference. The differential positioning step based on extended Kalman filtering is implemented by establishing a position velocity and acceleration (PVA) model, and estimating the optimal real-time position of an aircraft by means of an extended Kalman filter. The differential positioning method can effectively solve the problems of poor positioning precision caused by random errors such as user-side noise and multipaths of the ground-based augmentation system (GBAS) on the basis of carrier phase smoothing pseudorange and Kalman filter data smoothing advantages.

The invention provides an intelligent logistics platform of dangerous-goods transportation. The platform includes a Beidou ground-based augmentation system, a user terminal, a carrier, an RFID module,sensors, an intelligent lock control system and a background commanding and dispatching system. The intelligent lock control system is located on the carrier. The Beidou ground-based augmentation system includes a Beidou module and a Beidou satellite. The Beidou ground-based augmentation system sends identity information collected by the RFID module and real-time information, which is of temperature, humidity, vibration and light sources and is collected by sensor modules, to the background commanding and dispatching system through a manner of Beidou short messages. According to the platform,safety of dangerous-goods transportation is guaranteed through real-time interaction of information of three parts of the Beidou ground-based augmentation system, the intelligent lock control systemand the background commanding and dispatching system, and safety thereof is usually considered to be at a level of deciphering impossibility through user identity authentication of the intelligent lock control system. Therefore, the platform is characterized by security, accuracy and real-time positioning.

The invention relates to a method of real-time coordinate transformation of a ground-based augmentation system. The method comprises the following steps: sending a user name, a password, a source node and coarse position information to a NtripCaster by a user; sending the coarse position information to the ground-based augmentation system by the NtripCaster; broadcasting virtual reference station information of a coarse position to the NtripCaster by the ground-based augmentation system; decoding virtual reference station coordinates in an RTCM by the NtripCaster, and calculating velocity fields of virtual reference sites; transforming the virtual reference station ITRF coordinates into WGS84 or CGCS2000 coordinates by the NtripCaster; broadcasting the converted virtual reference station information for the user by the NtripCaster; and utilizing the converted virtual reference station information to perform relative positioning by the user, and obtaining the WGS84 and CGCS2000 coordinates. According to the method, coordinate transformation of the ground-based augmentation system is realized, the reliability and the stability of services of the ground-based augmentation system are guaranteed, an application range is wide, and the generality is high.

The invention discloses a construction method and construction system of the self-check system of a satellite ground-based augmentation system. The method includes the following steps of: a data receiving and detection step: a reference station is adopted as a mobile station located in a grid, after observation data from the reference station are received, detection is performed, and the working status of the base station is reported; a strategy formulation step: a coverage strategy is formulated according to the working status of the base station; and a network differential verification step:network differential verification is performed according to the differential data of the satellite ground-based augmentation system itself, the data detected in the data receiving and detection step,and the coverage strategy formulated in the strategy formulation step, and self-check is performed on the satellite ground-based augmentation system. According to the construction method and construction system of the self-check system of the satellite ground-based augmentation system of the invention, the ground-based receiving station is adopted as the detection mobile station, and therefore, alarge-scale ground-based augmentation network can be effectively detected, and the service capability of the ground-based augmentation network can be improved.

System and method for a Ground Based Augmentation System (GBAS) for detecting ionospheric and tropospheric disturbances using Multi Frequency Monitor. Receiving signals from a plurality of receiver pairs and determining a monitor measurement of tropospheric delay variation using data from at least one pair of the plurality of receivers. Determining a monitor measurement of the sum of tropospheric and the sum of ionospheric delay variations using data from the at least one pair of the plurality of receivers. Combining monitor measurements of tropospheric delay variations and of ionospheric delay variations into an ionospheric delay estimate.

The invention provides a base station positioning method based on the Beidou ground-based augmentation system and the Internet of Things. The method comprises the following steps: receiving reading information from a radio frequency identification positioning reader and sensing information from a sensing component by a calculation unit, and calculating a first position of an object according to the reading information and the sensing information. The base station positioning method based on the Beidou ground-based augmentation system and the Internet of Things provided by the invention combines the Beidou ground-based augmentation system and the Internet of Things technology, and with the advantages of the Beidou ground-based augmentation system and the Internet of Things technology, the object can be identified accurately and the accuracy of a traditional positioning device can be greatly improved.

The invention discloses a monitoring method of a GBAS (Ground Based Augmentation System) ionospheric spatial gradient based on a pseudolite, and is mainly used in the field of GBAS ionospheric storm monitoring and relevant application. The pseudolite observed quantity is introduced into a monitoring algorithm; the problems that the ionospheric gradient monitoring results of different satellites ofthe existing BGAS ionospheric storm monitoring algorithm are mutually influenced, the complexity of a fault isolation algorithm is high, and the like are solved; the single-satellite ionospheric storm isolation monitoring is realized; and meanwhile, GBAS monitoring stations are provided. The monitoring method has the characteristics that the monitoring accuracy is high; and the realization is flexible and simple.

The invention relates to an integrity risk allocation method based on Bayesian decision. The method comprises the steps of adopting a leakage detection product factor, and calculating vertical and horizontal protection levels under the assumption of H0 and H1; taking the protection levels as an integral limit value and a positioning error as the integral variable to perform integration on a probability density function under the assumption of H0 and H1 so as to obtain misinformation probability under the assumption of H0 and H1; based on the Bayesian decision minimum total error rate criterionand the misinformation probability, counting the proportion of the misinformation in the total sampling number under the assumption of H0 and H1, reallocating the total misinformation probability, and calculating a new leakage detection product factor; calculating the vertical and horizontal protection levels under the assumption of H0 and H1 according to the new leakage detection product factor,taking the maximum value of the vertical and horizontal protection levels as the protection level of the GBAS on-board terminal, and the like. According to the method in the invention, the error rateof integrity risk probability allocation is effectively reduced, the actual positioning error is tightly enveloped by the calculated vertical and horizontal protection levels, and the usability of the navigation system is improved.

The invention provides an extreme value theory-based error envelope method of a satellite navigation ground-based augmentation system. The method includes the following steps that: at least two groups of pseudo-range error calibration positive sample values are obtained; a first quantile which has an assigned risk and first standard deviation are corresponding to each group of pseudo-range error calibration positive sample values are determined; a second quantile which is corresponding to a total operating risk of the ground-based augmentation system (GBAS) under Standard Gaussian distribution is determined according to the total operating risk of the ground-based augmentation system (GBAS); and amplification factors corresponding to each group of pseudo-range error calibration positive sample values can be determined according to the first quantile, the second quantile and the fist standard deviation. With the above method adopted, the amplification factors can be calculated accurately, and the calculated pseudo-range calibration values can envelope actual errors, and the continuity of the system can be effectively improved.

In order to solve the problem that the current vehicle positioning accuracy is not high, real-time positioning often fails due to satellite signals being blocked in urban high-rise areas, canyons, tunnels and other areas, the present invention proposes a vehicle positioning system based on four-star fusion, which includes Space-based positioning system, ground-based augmentation system, ground monitoring system, wireless network communication system and vehicle terminal system, space-based positioning system includes Beidou satellite navigation system, global positioning system (GPS), GLONASS satellite navigation system (GLONASS) and Galileo satellite navigation system. Ground-based augmentation systems include the Continuously Operating Satellite Reference System (CORS) and the Beidou Ground-based Augmentation System. Through the four-star fusion space-based system, it effectively solves satellite ephemeris error, satellite signal transmitting antenna phase error, satellite clock error, troposphere and ionosphere delay, receiver phase center deviation and relativistic effect, etc., which can greatly improve positioning Accuracy and positioning effect.

The invention provides a narrowband broadcasting method of a Beidou ground based augmentation positioning message. A Beidou / GPS dual-mode positioning module obtains combined positioning data by meansof a GPS navigation system and a Beidou satellite navigation system; a wireless network communication module enables networking communication between a ground real-time positioning terminal and a Beidou ground based augmentation system via the service network; a data service center receives a signal of the Beidou satellite navigation system and the Beidou / GPS dual-mode positioning module combinedpositioning data of the ground real-time positioning terminal, and a GNSS differential correction between the signal of the Beidou satellite navigation system and the combined positioning data is calculated according to a reference coordinate of a ground based augmentation reference station, and sent to the Beidou / GPS dual-mode positioning module of the ground real-time positioning terminal; and the Beidou / GPS dual-mode positioning module combines the GNSS differential correction of the Beidou ground based augmentation system with correction of the combined positioning data, obtains final positioning data, and sends the final positioning data to a narrowband sending unit, and a sending unit receives the signal, processes the data and then sends the message.