CN104950320A - Method and system for monitoring troposphere correction parameters of ground based augmentation system - Google Patents
Method and system for monitoring troposphere correction parameters of ground based augmentation system Download PDFInfo
- Publication number
- CN104950320A CN104950320A CN201510186581.7A CN201510186581A CN104950320A CN 104950320 A CN104950320 A CN 104950320A CN 201510186581 A CN201510186581 A CN 201510186581A CN 104950320 A CN104950320 A CN 104950320A
- Authority
- CN
- China
- Prior art keywords
- meteorological
- correction parameters
- parameters
- correction
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012937 correction Methods 0.000 title claims abstract description 192
- 239000005436 troposphere Substances 0.000 title claims abstract description 80
- 238000012544 monitoring process Methods 0.000 title claims abstract description 41
- 230000003416 augmentation Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012545 processing Methods 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 13
- 238000012986 modification Methods 0.000 claims description 3
- 230000004048 modification Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000005433 ionosphere Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 101000699762 Homo sapiens RNA 3'-terminal phosphate cyclase Proteins 0.000 description 2
- 102100029143 RNA 3'-terminal phosphate cyclase Human genes 0.000 description 2
- IWUCXVSUMQZMFG-AFCXAGJDSA-N Ribavirin Chemical compound N1=C(C(=O)N)N=CN1[C@H]1[C@H](O)[C@H](O)[C@@H](CO)O1 IWUCXVSUMQZMFG-AFCXAGJDSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000005437 stratosphere Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/07—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
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.
Description
Technical Field
The invention relates to the technical field of navigation, in particular to a method and a system for monitoring troposphere correction parameters of a foundation enhancement system.
Background
Global Navigation Satellite System (GNSS) is a generic term for all in-orbit Satellite Navigation systems and related augmentation systems. With the construction of satellite navigation systems in countries and regions of the world, there have been 4 satellite navigation systems providing global or regional navigation services, including GPS, beidou, GLONASS, GALILEO, and the like. In order to improve the navigation performance of a satellite navigation system, particularly improve the integrity of satellite navigation so as to meet the requirements of Civil Aviation users in different flight phases and different navigation specifications, three types of enhancement systems are defined by the International Civil Aviation organization (ICAO for short) on the basis of independent operation of the satellite navigation system so as to enhance the satellite navigation performance. The GNSS Augmentation System includes an Airborne Augmentation System (ABAS), a Satellite-Based Augmentation System (SBAS), and a Ground-Based Augmentation System (GBAS).
The ground enhancement system comprises a satellite navigation system, a ground station and an airborne device, and mainly adopts a differential technology to reduce GNSS measurement errors so as to achieve the purpose of improving the GNSS positioning accuracy. The differential technique is a widely applied and effective method for reducing and eliminating various GNSS measurement errors. The principle of the differential technique is mainly based on the characteristics of spatial correlation and time correlation of satellite clock error, ephemeris error, ionosphere delay and troposphere delay, and for different receivers (generally: a reference station receiver and a mobile station receiver) in the same area, the various errors contained in their GNSS measurement values are approximately equal or related to distance. The influence of the correlation error source on the differential correction accuracy is shown in table 1:
TABLE 1 major sources of error in ground based augmentation systems
It can be seen from the main error source of the foundation enhancement system that the closer the airborne receiver is to the ground station, the stronger the correlation of the measurement errors between the open space and the ground, and the better the working effect of the foundation enhancement system. With the development of the technology, the orbit accuracy of the global satellite navigation system is greatly improved, so that errors generated by ionospheric delay and tropospheric refraction become main reasons for limiting the navigation and positioning accuracy. Meanwhile, with the development of a multi-constellation multi-frequency point differential technology, an ionosphere error can be eliminated through the dual-frequency differential technology, and a troposphere delay error becomes a main error source.
In the design process of the existing foundation enhancement system, when troposphere delay errors are processed, troposphere correction parameters are generated in a pre-statistical mode, the troposphere correction parameters are generated by a ground station through meteorological Data calculation and are sent to an airplane through a VDB (very high frequency Data Broadcast) transmitter, and the troposphere delay amount is calculated by airborne equipment of the airplane through the troposphere correction parameters, so that the accuracy of the troposphere correction parameters directly influences the error magnitude of the calculated troposphere delay amount. The troposphere correction parameters calculated by the ground station are inaccurate, the troposphere delay error calculated by the airborne equipment is large, and the troposphere delay error caused by weather change is large in areas with complicated weather change, especially plateau areas, so that the troposphere delay error cannot be effectively eliminated.
Disclosure of Invention
The invention provides a method and a system for monitoring troposphere correction parameters of a foundation enhancement system, which aim to solve the problem of poor accuracy of troposphere correction parameters and troposphere delay errors in the prior art.
A first aspect of the present invention provides a method of monitoring tropospheric correction parameters of a ground based augmentation system, comprising: acquiring current first meteorological data and second meteorological data, wherein the first meteorological data comprises meteorological data which are acquired nearby an airport by using meteorological equipment, and the second meteorological data comprises aeronautical meteorological information data which are acquired by using aeronautical meteorological service equipment; correcting tropospheric parameters according to the first meteorological data to obtain a first set of correction parameters; correcting troposphere parameters according to the second meteorological data to obtain a second group of correction parameters; comparing the first group of correction parameters and the second group of correction parameters with a meteorological statistical threshold, and outputting a third group of correction parameters according to a comparison result; obtaining a correction error according to the enhancement data, the navigation data and the third group of correction parameters, comparing the correction error with a preset correction error threshold, and giving an alarm to stop the enhancement service of the ground station if the correction error is greater than the preset correction error threshold; otherwise, performing the ground station enhanced service.
In a first possible implementation manner, the correcting tropospheric parameters from the first meteorological data to obtain a first set of correction parameters includes: a first set of correction parameters is obtained based on a Hopfield improved model from the first meteorological data.
In a second possible implementation manner, the correcting tropospheric parameters according to the second meteorological data to obtain a second set of corrected parameters includes: and obtaining a second group of correction parameters based on a Hopfield improved model according to the second meteorological data.
According to the first aspect, in a third possible implementation manner, the comparing the first set of correction parameters and the second set of correction parameters with a meteorological statistical threshold, and outputting a third set of correction parameters according to a comparison result includes: if the first group of correction parameters is smaller than the meteorological statistical threshold, outputting a third group of correction parameters; or if the second group of correction parameters is smaller than the meteorological statistic threshold, outputting a third group of correction parameters; wherein the third set of correction parameters is the smaller of the first set of correction parameters and the second set of correction parameters.
According to the first aspect, in a fourth possible implementation manner, the comparing the first set of correction parameters and the second set of correction parameters with a meteorological statistical threshold, and outputting a third set of correction parameters according to a comparison result further includes: and if the first group of correction parameters is greater than or equal to the meteorological statistic threshold value and the second group of correction parameters is greater than or equal to the meteorological statistic threshold value, outputting alarm information and stopping the ground station enhanced service.
The second aspect of the present invention provides a system for monitoring troposphere correction parameters of a ground-based augmentation system, which includes meteorological equipment, troposphere monitoring equipment, and aeronautical meteorological service equipment, and is characterized by further including: the processor in the ground station of the ground-based augmentation system is used for monitoring the convective layer correction parameters; and the troposphere monitoring equipment is connected with a processor in the ground station, evaluates the generated troposphere correction parameters in real time, and sends the third group of correction parameters to the processor in the ground station.
According to a second aspect, in a first possible implementation, the tropospheric monitoring apparatus comprises a meteorological data processing module, a correction parameter comparison module, a tropospheric correction parameter calculation module, a tropospheric delay warning module and a meteorological data recording module;
the meteorological data processing module is used for acquiring current first meteorological data and second meteorological data;
the troposphere correction parameter calculation module is used for correcting troposphere parameters according to the first meteorological data to obtain a first group of correction parameters; correcting troposphere parameters according to the second meteorological data to obtain a second group of correction parameters;
the correction parameter comparison module is used for comparing a first group of correction parameters, a second group of correction parameters and a meteorological statistic threshold, if the first group of correction parameters are greater than or equal to the meteorological statistic threshold and the second group of correction parameters are greater than or equal to the meteorological statistic threshold, the warning information is sent to the troposphere delay warning module, and if not, a third group of correction parameters are output;
and the meteorological data recording module is used for generating a meteorological statistic threshold and a correction error threshold.
The method and the system for monitoring the troposphere correction parameters of the foundation enhancement system acquire more accurate flow correction parameters and can acquire smaller correction error sigma through acquiring the current meteorological data in real time and comparing the first correction parameter, the second correction parameter and the meteorological statistical threshold valuetropoAnd the troposphere delay TC is more accurate, and the accuracy of the foundation enhancement system is improved. Meanwhile, fault warning is provided for the ground station, the integrity, the availability and the continuity of the foundation enhancement system are improved, and the safety and the reliability of the foundation enhancement system applied to civil aviation are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a method for monitoring tropospheric correction parameters of a ground-based augmentation system according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for monitoring tropospheric correction parameters of a ground-based augmentation system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a system for monitoring tropospheric correction parameters of a ground-based augmentation system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a tropospheric monitoring apparatus of a system for monitoring tropospheric modification parameters of a ground-based augmentation system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of data transmission relationship of a system for monitoring tropospheric correction parameters of a ground-based augmentation system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The GNSS ground-based augmentation system comprises a satellite navigation system, a ground station and an airborne device. The satellite navigation system is a system for generating ranging signals by a navigation satellite and sending the ranging signals to a ground station and airborne equipment. The ground station, namely GBAS ground facility, comprises four reference receivers, a processor, a set of VDF Data Broadcast (VHF Data Broadcast) transmitters and receivers, calculates pseudo-range correction values of satellites according to satellite ranging signals and the precise positions of the reference receivers known in advance, obtains system integrity information through an integrity monitoring algorithm, and transmits the information to airborne equipment through the VDB transmitters. The airborne equipment is mainly a multi-mode receiver, receives and processes signals transmitted by a satellite navigation system and a ground station, and outputs corrected position data and integrity alarm information. The following is a detailed description.
Fig. 1 is a schematic diagram of a method for monitoring tropospheric correction parameters of a ground-based augmentation system according to an embodiment of the present invention, and fig. 2 shows only key steps therein and is a simplified illustration. Referring to fig. 1 and 2, the method mainly comprises:
and step 10, acquiring current first meteorological data and second meteorological data.
The ground station, the control center and the position area monitoring station of the GNSS foundation augmentation system are connected through an optical fiber ring network, and a TCP/IP link is adopted for data communication, so that stable and reliable data communication between the systems is ensured. The control center is an airport management system, and the position domain monitoring station is an independent device for monitoring the performance of the ground enhancement system. The looped network has the advantages that after network breakpoints occur, the three subsystems can be normally interconnected, and the reliability of the system is improved. The advantage of fiber optic networks over cable networks is their greater resistance to electromagnetic interference. Thus, fiber optic ring networks offer advantages over other types of networks, such as star networks.
The method comprises the steps of collecting first meteorological data near an airport by using meteorological equipment, and obtaining aeronautical meteorological information data, namely second meteorological data, by using aeronautical meteorological service equipment.
The current first meteorological data and the second meteorological data can be acquired by the meteorological equipment and the aeronautical meteorological service equipment every second, so that the stratosphere can be monitored in real time.
Step 11, correcting troposphere parameters according to the first meteorological data to obtain a first group of correction parameters; and correcting the troposphere parameters according to the second meteorological data to obtain a second group of correction parameters.
The tropospheric parameters mainly include the number of fluid-layer indices NRMean atmospheric height h0And refractive uncertainty σN。NR、h0For calculating tropospheric delay, σNUsed to estimate tropospheric delay errors.
Preferably, a first set of correction parameters is obtained based on a Hopfield improvement model from said first meteorological data.
Preferably, a second set of correction parameters is obtained based on a Hopfield improvement model from said second meteorological data.
Obtaining a first group of correction parameters or a second group of correction parameters based on a Hopfield improved model, wherein the specific calculation process is as follows:
for the convenience of scientific research and calculation, the refractive index N of the troposphere is usually converted into a refractive index NRAnd is defined as
NR＝(n-1)×10-6 (1)
Compared with the ionosphere, the influence of the troposphere on the signal is more complex, and considering the influence caused by the change of water vapor in the troposphere, the troposphere delay is divided into dry delay and wet delay for consideration in the research. Tropospheric refractive index NRRefractive index N divided into dry components in generalRdryAnd wet component refractive index NRwetThe dry component generally refers to dry air such as oxygen and nitrogen, the wet component mainly refers to water vapor, and the empirical formula of the refractive index of the two components is as follows:
NR＝NRdry+NRwet (2)
or
Wherein, P0Atmospheric pressure, T, collected for a reference station0The temperature collected by the reference station. e.g. of the type0These meteorological parameters all vary with height, for the partial pressure of water vapor in millibar. However, due to e0Since it cannot be directly measured by a meteorological sensor, it is generally calculated by converting the relative humidity RH. The conversion algorithm is as follows:
therefore, the calculation method of the tropospheric refractive index is equivalent to,
to calculate the mean atmospheric altitude parameter h0Also, the division into dry components (h) is required0dry) And moisture content (h)0wet) The specific calculation method is that,
wherein h issIs the altitude of the reference station in meters.
By using the above components, a mean atmospheric altitude parameter h can be obtained0，
Refractive uncertainty:
this embodiment includes, but is not limited to, an implementation based on the Hopfield improved model, other techniques are the Hopfield model and the Saastamoinen model.
Troposphere correction parameter N obtained by using Hopfield improved modelR、h0And σN. Obtaining a first set of corrections from the first meteorological dataPositive parameter NR1、h01And σN1(ii) a Obtaining a second set of correction parameters N from the second meteorological dataR2、h02And σN2。
And 12, comparing the first group of correction parameters and the second group of correction parameters with a meteorological statistical threshold, and outputting a third group of correction parameters according to a comparison result.
If the first group of correction parameters is smaller than the meteorological statistical threshold, outputting a third group of correction parameters; or,
if the second group of correction parameters is smaller than the meteorological statistical threshold, outputting a third group of correction parameters;
wherein the third set of correction parameters is the smaller of the first set of correction parameters and the second set of correction parameters.
In addition, if the first group of correction parameters is greater than or equal to the meteorological statistic threshold value and the second group of correction parameters is greater than or equal to the meteorological statistic threshold value, alarm information is output and the enhancement service is stopped.
The meteorological statistic threshold is obtained by counting 1 year meteorological data collected by airport meteorological equipment and calculating the refraction uncertainty sigma calculated every dayNAnd carrying out coefficient amplification to obtain a meteorological statistical threshold. For example, it is calculated using the following formula,
e.g. σN1<σN2,σN1Is a parameter of the first set of modification parameters, σN2Is a parameter of the second set of correction parameters, σN_ThresholdIs a meteorological statistical threshold, if σN1<σN_ThresholdOr σN2<σN_ThresholdThen output σN1Corresponding first set of correction parameters NR1、h01And σN1As a third groupCorrection parameter NR、h0And σN。。
If σ isN1>σN_ThresholdAnd sigmaN2>σN_ThresholdAnd outputting alarm information to stop the enhancement service of the ground station.
The ground station enhanced service is to transmit differential data produced by the ground station through a VDB transmitter, and the airplane performs differential processing through the data to improve positioning accuracy and guide the airplane to land. The stop enhanced service is that the VDB transmitter stops transmitting data.
Step 13, obtaining a correction error according to the enhanced data, the navigation data and the third group of correction parameters, comparing the correction error with a preset correction error threshold, and giving an alarm to stop the service of the ground station if the correction error is greater than the preset correction error threshold; otherwise, performing the ground station enhanced service.
The third set of modified parameters is broadcast in RTCA DO-246 format using the VDB transmitter of the ground station.
The enhancement data mainly refers to differential correction data, including pseudo-range correction parameters, troposphere correction parameters, flight path data and the like.
The ground navigation data is received by the ground station reference receiver through the receiver antenna, and the navigation data on the airplane is received by the airborne equipment through the antenna.
The position domain monitoring unit receives the enhanced data sent by the ground station, and performs differential processing and integrity processing on the enhanced data and the received navigation data to obtain a correction error sigmatropoWill correct the error sigmatropoAnd a correction error threshold sigmatropo_ThresholdMaking a comparison if σtropo>σtropo_ThresholdAlarming is carried out, the ground station service is stopped, and the safety of the enhanced service is ensured; otherwise, normal ground station enhanced service is carried out.
Stream-level delay TC and correction error sigmatropoIs calculated by the airborne equipment by using the third correction parameter broadcasted by the ground station, and the method comprises the following steps,
wherein, θ: elevation of the observed satellite;
Δ h: the height of the aircraft relative to the ground.
The current calculation method is statistical acquisition by using weather historical data, but in the embodiment, by acquiring current weather data in real time and comparing the first correction parameter, the second correction parameter and a weather statistical threshold value, more accurate flow correction parameters are obtained, and by using formulas 11 and 12, a smaller correction error sigma can be obtainedtropoAnd the troposphere delay TC is more accurate, and the accuracy of the foundation enhancement system is improved. Meanwhile, fault warning is provided for the ground station, the integrity, the availability and the continuity of the foundation enhancement system are improved, and the safety and the reliability of the foundation enhancement system applied to civil aviation are improved.
Referring to fig. 3 and 4, the apparatus for monitoring tropospheric correction parameters of a GNSS ground-based augmentation system of the present invention requires connecting a processor a3 in a ground station a of the GNSS ground-based augmentation system to monitor tropospheric correction parameters. The system comprises: meteorological equipment A1, troposphere monitoring equipment A2, aeronautical weather service equipment C1. Troposphere monitoring equipment A2 in the device needs to be connected with a processor A3 in a ground station A, real-time evaluation is carried out on generated troposphere correction parameters, effective parameters are sent to the processor A3, broadcasting is carried out, and finally the reliability and accuracy of the work of the foundation enhancement system are improved. The tropospheric monitoring apparatus a2 includes: a meteorological data processing module A21, a correction parameter comparison module A22, a troposphere correction parameter calculation module A23, a troposphere delay warning module A24 and a meteorological data recording module A25, as shown in FIG. 4.
And the meteorological data processing module A21 is used for acquiring the current first meteorological data and the second meteorological data.
A troposphere correction parameter calculation module A23, configured to correct troposphere parameters according to the first meteorological data to obtain a first set of correction parameters; and correcting troposphere parameters according to the second meteorological data to obtain a second group of correction parameters.
And the correction parameter comparison module A22 is used for comparing the first group of correction parameters, the second group of correction parameters and the meteorological statistic threshold, if the first group of correction parameters is greater than or equal to the meteorological statistic threshold, and if the second group of correction parameters is greater than or equal to the meteorological statistic threshold, the warning information is sent to the troposphere delay warning module A24, otherwise, the third group of correction parameters is output.
And the meteorological data recording module A25 is used for generating troposphere correction parameter thresholds.
Referring to fig. 5, the data transmission relationship of the whole system of the present invention is as follows:
the meteorological device a1 sends data 1 (i.e., first meteorological data, mainly including temperature, humidity, and barometric pressure) to the tropospheric monitoring device a 2.
Aeronautical weather service equipment C1 is erected in a control center, receives flight information data in real time, analyzes data 2 (namely, second weather data mainly comprising information such as temperature, humidity, air pressure, wind speed, cloud and precipitation) and sends the data to troposphere monitoring equipment A2.
The troposphere monitoring equipment A2 receives the meteorological data 1 sent by the meteorological equipment A1 and sends the meteorological data to the meteorological data processing module A21 and the meteorological data recording module A25. Meanwhile, the data 2 sent by the aeronautical weather service equipment C1 is received and sent to the meteorological data processing module A21 and the meteorological data recording module A25.
And the meteorological data recording module A25 is used for recording the meteorological data 4 and the aeronautical meteorological data 6 for later data statistics and generating a troposphere correction error threshold value.
The average and variance statistics are performed using the weather data received each day, for example, the tropospheric correction error threshold is calculated using 1 year data, as follows:
the meteorological data processing module A21 processes the meteorological data 3 and the aeronautical meteorological data 5 in real time to obtain meteorological data such as temperature (T), air pressure (P), Relative Humidity (RH) and the like in a unified format.
Tropospheric correction parameters calculation module A23, using temperature (T), barometric pressure (P) and relative humidity (R)H) When the meteorological data are equal, a Hopfield improved model is adopted to calculate a troposphere correction parameter 8, which mainly comprises a troposphere refractive index (N)R) Mean atmospheric height (h)0) And refractive uncertainty (σ)N)。
And the correction parameter comparison module A22 is used for comparing the first group of correction parameters, the second group of correction parameters and the meteorological statistic threshold, if the first group of correction parameters is greater than or equal to the meteorological statistic threshold, and if the second group of correction parameters is greater than or equal to the meteorological statistic threshold, the warning information is sent to the troposphere delay warning module A24, otherwise, the third group of correction parameters is output.
The troposphere delay warning module A24 receives the troposphere correction parameter 11 sent by the correction parameter comparison module A22, formats the troposphere correction parameter and sends the troposphere correction parameter to the processor A3; if tropospheric correction parameters 11 are not received, indicating that the correction parameters calculated using real-time collected meteorological data all exceed the threshold, the module sends an alert message to processor A3.
The processor A3, after receiving the troposphere correction parameters 13 sent by the troposphere delay warning module a24, formats the data, packages the data according to the RTCA DO-246 format, and broadcasts the data through the VDB transmitter. If the alarm message sent by the tropospheric delay alarm module a24 is received, the handler A3 will stop the packetization operation and terminate the ground station enhanced service until the alarm is cancelled.
The VDB transmitter is a very high frequency radio station, a device in a ground station, and is used for broadcasting enhancement data generated by the ground station, including pseudo-range correction data, troposphere correction data, and track data. The airborne equipment receives the data broadcast by the VDB transmitter and then performs differential processing by combining the received satellite navigation data.
The interface a, the interface b and the interface c in fig. 5 are only processing of data formats, belong to the prior art, and are not described in detail here.
Compared with the prior art, the invention has the following advantages:
according to the invention, the ground station, the position domain monitoring station and the control center of the GNSS foundation augmentation system are connected through the optical fiber ring network, so that information interaction of the three subsystems is realized, the false alarm probability of the system is reduced, and the integrity of the system is improved.
According to the method, the distributed enhanced data are monitored on line in real time by the position domain monitoring station, so that the accuracy of troposphere correction parameters broadcasted by the ground station and the influence on differential positioning accuracy can be effectively monitored, real-time feedback is performed, and the safety and reliability of the GNSS foundation enhancement system are improved.
According to the invention, real-time troposphere monitoring is carried out through meteorological data acquired by local meteorological equipment every second and aeronautical meteorological data received by a control center every second, troposphere correction parameters are generated, troposphere delay errors are reduced, differential positioning accuracy is improved, and the influence of troposphere changes on a GNSS foundation enhancement system is effectively reduced.
Compared with a foundation enhancement service system without troposphere correction parameter monitoring capability, the method and the system effectively improve the monitoring capability of the accuracy, integrity, availability and continuity of the foundation enhancement system enhancement service.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A method of monitoring a tropospheric modification parameter of a ground based augmentation system, comprising:
acquiring current first meteorological data and second meteorological data, wherein the first meteorological data comprises meteorological data which are acquired nearby an airport by using meteorological equipment, and the second meteorological data comprises aeronautical meteorological information data acquired by using aeronautical meteorological service equipment;
correcting tropospheric parameters according to the first meteorological data to obtain a first set of correction parameters; correcting troposphere parameters according to the second meteorological data to obtain a second group of correction parameters;
comparing the first group of correction parameters and the second group of correction parameters with a meteorological statistical threshold, and outputting a third group of correction parameters according to a comparison result;
obtaining a correction error according to the enhancement data, the navigation data and the third group of correction parameters, comparing the correction error with a preset correction error threshold, and giving an alarm to stop the enhancement service of the ground station if the correction error is greater than the preset correction error threshold; otherwise, performing the ground station enhanced service.
2. The method of claim 1, wherein said modifying tropospheric parameters from said first meteorological data to obtain a first set of modified parameters comprises: a first set of correction parameters is obtained based on a Hopfield improved model from the first meteorological data.
3. The method of claim 1, wherein said modifying tropospheric parameters from said second meteorological data to obtain a second set of modified parameters comprises: and obtaining a second group of correction parameters based on a Hopfield improved model according to the second meteorological data.
4. The method of claim 1, wherein comparing the first and second sets of modified parameters to a meteorological statistical threshold and outputting a third set of modified parameters based on the comparison comprises:
if the first group of correction parameters is smaller than the meteorological statistical threshold, outputting a third group of correction parameters; or,
if the second group of correction parameters is smaller than the meteorological statistical threshold, outputting a third group of correction parameters;
wherein the third set of correction parameters is the smaller of the first set of correction parameters and the second set of correction parameters.
5. The method of claim 1, wherein comparing the first and second sets of modified parameters to a meteorological statistical threshold and outputting a third set of modified parameters based on the comparison further comprises:
and if the first group of correction parameters is greater than or equal to the meteorological statistic threshold value and the second group of correction parameters is greater than or equal to the meteorological statistic threshold value, outputting alarm information and stopping the ground station enhanced service.
6. A system for monitoring troposphere correction parameters of a ground-based augmentation system comprises meteorological equipment, troposphere monitoring equipment and aeronautical meteorological service equipment, and is characterized by further comprising:
a processor in a ground based augmentation system ground station to enable monitoring of the tropospheric correction parameters;
and the troposphere monitoring equipment is connected with a processor in the ground station, evaluates the generated troposphere correction parameters in real time, and sends the third group of correction parameters to the processor in the ground station.
7. The system of claim 6, wherein the tropospheric monitoring equipment comprises a meteorological data processing module, a modified parameter comparison module, a tropospheric modified parameter calculation module, a tropospheric delay warning module, and a meteorological data recording module;
the meteorological data processing module is used for acquiring current first meteorological data and second meteorological data;
the troposphere correction parameter calculation module is used for correcting troposphere parameters according to the first meteorological data to obtain a first group of correction parameters; correcting troposphere parameters according to the second meteorological data to obtain a second group of correction parameters;
the correction parameter comparison module is used for comparing a first group of correction parameters, a second group of correction parameters and a meteorological statistic threshold, if the first group of correction parameters are greater than or equal to the meteorological statistic threshold and the second group of correction parameters are greater than or equal to the meteorological statistic threshold, the warning information is sent to the troposphere delay warning module, and if not, a third group of correction parameters are output;
and the meteorological data recording module is used for generating a meteorological statistic threshold and a correction error threshold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510186581.7A CN104950320B (en) | 2015-04-20 | 2015-04-20 | Method and system for monitoring troposphere correction parameters of foundation enhancement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510186581.7A CN104950320B (en) | 2015-04-20 | 2015-04-20 | Method and system for monitoring troposphere correction parameters of foundation enhancement system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104950320A true CN104950320A (en) | 2015-09-30 |
| CN104950320B CN104950320B (en) | 2021-06-22 |
Family
ID=54165117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510186581.7A Active CN104950320B (en) | 2015-04-20 | 2015-04-20 | Method and system for monitoring troposphere correction parameters of foundation enhancement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104950320B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652281A (en) * | 2016-02-29 | 2016-06-08 | 武汉大学 | Method and system for photoelectric ranging meteorological correction |
| CN105891846A (en) * | 2016-05-31 | 2016-08-24 | 天津七二通信广播有限公司 | High-reliability base reinforcing system ground station equipment and online switching method |
| CN109141214A (en) * | 2017-10-27 | 2019-01-04 | 北极星云空间技术股份有限公司 | A kind of deformation monitoring multi-source confirmation method based on Beidou meteorologic model |
| CN109901203A (en) * | 2019-03-27 | 2019-06-18 | 北京航空航天大学 | A kind of ground strengthening system of tropospheric refraction rate high-precision forecast |
| CN114070385A (en) * | 2022-01-17 | 2022-02-18 | 天津七一二通信广播股份有限公司 | GBAS system in complex airport environment and application method |
| CN116299181A (en) * | 2023-03-17 | 2023-06-23 | 成都理工大学 | Sound source three-dimensional space positioning system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003087870A1 (en) * | 2002-04-12 | 2003-10-23 | Alcatel | System and method for augmentation of satellite positioning systems |
| CN101089650A (en) * | 2007-07-12 | 2007-12-19 | 北京航空航天大学 | Error separation method based on foundation strength system and foundation strength system |
| CN101109805A (en) * | 2007-08-13 | 2008-01-23 | 北京航空航天大学 | Locating method for satellite navigation reinforcing system |
| CN101776762A (en) * | 2009-12-30 | 2010-07-14 | 北京航空航天大学 | Completeness monitoring method, device and system based on multi-foundation enhancement system |
| CN101893713A (en) * | 2010-07-23 | 2010-11-24 | 中国电子科技集团公司第二十研究所 | Device and method for monitoring release information performance of local area augmentation system |
| EP2693419A2 (en) * | 2012-07-31 | 2014-02-05 | General Electric Company | Method and apparatus for providing in-flight weather data |
-
2015
- 2015-04-20 CN CN201510186581.7A patent/CN104950320B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003087870A1 (en) * | 2002-04-12 | 2003-10-23 | Alcatel | System and method for augmentation of satellite positioning systems |
| CN101089650A (en) * | 2007-07-12 | 2007-12-19 | 北京航空航天大学 | Error separation method based on foundation strength system and foundation strength system |
| CN101109805A (en) * | 2007-08-13 | 2008-01-23 | 北京航空航天大学 | Locating method for satellite navigation reinforcing system |
| CN101776762A (en) * | 2009-12-30 | 2010-07-14 | 北京航空航天大学 | Completeness monitoring method, device and system based on multi-foundation enhancement system |
| CN101893713A (en) * | 2010-07-23 | 2010-11-24 | 中国电子科技集团公司第二十研究所 | Device and method for monitoring release information performance of local area augmentation system |
| EP2693419A2 (en) * | 2012-07-31 | 2014-02-05 | General Electric Company | Method and apparatus for providing in-flight weather data |
Non-Patent Citations (2)
| Title |
|---|
| DR. GARY A. MCGRAW ET AL.: "Tropospheric Error Modeling for High Integrity Airborne GNSS Navigation", 《2012 IEEE》 * |
| 郑金华等: "地基增强系统（GBAS）中对流层修正方法研究", 《第四届中国卫星导航学术年会电子文集》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652281A (en) * | 2016-02-29 | 2016-06-08 | 武汉大学 | Method and system for photoelectric ranging meteorological correction |
| CN105652281B (en) * | 2016-02-29 | 2018-04-20 | 武汉大学 | A kind of method and system for electro-optical distance measurement atmospheric correction |
| CN105891846A (en) * | 2016-05-31 | 2016-08-24 | 天津七二通信广播有限公司 | High-reliability base reinforcing system ground station equipment and online switching method |
| CN109141214A (en) * | 2017-10-27 | 2019-01-04 | 北极星云空间技术股份有限公司 | A kind of deformation monitoring multi-source confirmation method based on Beidou meteorologic model |
| CN109901203A (en) * | 2019-03-27 | 2019-06-18 | 北京航空航天大学 | A kind of ground strengthening system of tropospheric refraction rate high-precision forecast |
| CN109901203B (en) * | 2019-03-27 | 2020-12-18 | 北京航空航天大学 | Foundation enhancement system for predicting troposphere refractive index with high precision |
| CN114070385A (en) * | 2022-01-17 | 2022-02-18 | 天津七一二通信广播股份有限公司 | GBAS system in complex airport environment and application method |
| CN114070385B (en) * | 2022-01-17 | 2022-05-03 | 天津七一二通信广播股份有限公司 | GBAS system in complex airport environment and application method |
| CN116299181A (en) * | 2023-03-17 | 2023-06-23 | 成都理工大学 | Sound source three-dimensional space positioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104950320B (en) | 2021-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104950320B (en) | Method and system for monitoring troposphere correction parameters of foundation enhancement system | |
| US10962651B2 (en) | Ionospheric delay correction method for LEO satellite augmented navigation systems | |
| WO2020228754A1 (en) | Orbit determination method, device and system for lower earth orbit satellite | |
| CN104483678B (en) | A kind of many constellations satellite navigation integrity multistage monitoring method of air-ground coordination | |
| CA2822228C (en) | Method of monitoring the integrity of radio-navigation stations in a satellite based augmentation system | |
| CN105866802B (en) | A kind of tropospheric delay completeness monitoring method and device | |
| CN108490459B (en) | Method and system for applying precision and risk balance to GNSS position service | |
| CN101776762A (en) | Completeness monitoring method, device and system based on multi-foundation enhancement system | |
| CN115826016B (en) | Beidou double-frequency star-based enhanced correction and integrity parameter resolving method | |
| CN110007326B (en) | Double-frequency ranging error parameter generation method for satellite-based augmentation system | |
| CN113406673B (en) | Method for monitoring real-time correction service integrity of wide area difference enhancement system | |
| US20110231038A1 (en) | Aircraft landing system using relative gnss | |
| KR101654003B1 (en) | the methods of GNSS signal quality monitoring, estimation of navigation error, and the reliability determination using maritime PNT module | |
| JP4723932B2 (en) | Positioning system | |
| CN102016620A (en) | Network and method for calculating ionosphere corrections | |
| CN110988934B (en) | Multi-mode receiver satellite-based enhancement technology device and processing method | |
| CN111025347A (en) | Multi-mode receiver foundation enhancement technical device and processing method | |
| CN101839986B (en) | Satellite navigation monitoring method and system based on LAAS (Local Area Augmentation System) and WAAS (Wide Area Augmentation System) | |
| Weinbach et al. | Integrity of the trimble® CenterPoint RTX correction service | |
| US20240134065A1 (en) | System and method for distributed integrity monitoring | |
| CN113267793B (en) | GBAS troposphere parameter generation method based on external enhancement information | |
| Falk et al. | Using automatic dependent surveillance-broadcast data for monitoring aircraft altimetry system error | |
| Skorkowski et al. | Analysis of EGNOS-augmented GPS receiver positioning accuracy | |
| Mei et al. | GNSS vulnerability assessment method based on ARAIM user algorithm | |
| Harima et al. | Transmission of augmentation messages for precise point positioning utilizing Japanese QZSS LEX signal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 710068 Baisha Road, Yanta District, Xi'an, Xi'an, Shaanxi Applicant after: China Electronics Technology Group Corporation 20th Research Institute Applicant after: Northwest Limited Company Limited Address before: 710068 Baisha Road, Yanta District, Xi'an, Xi'an, Shaanxi Applicant before: China Electronics Technology Group Corporation 20th Research Institute Applicant before: In the research of modern navigation (Xi'an) Technology Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |