CN105182374A - Method and system based on big dipper short message precision track and clock correction broadcasting - Google Patents
Method and system based on big dipper short message precision track and clock correction broadcasting Download PDFInfo
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- CN105182374A CN105182374A CN201510539758.7A CN201510539758A CN105182374A CN 105182374 A CN105182374 A CN 105182374A CN 201510539758 A CN201510539758 A CN 201510539758A CN 105182374 A CN105182374 A CN 105182374A
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- 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
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/27—Acquisition or tracking or demodulation of signals transmitted by the system creating, predicting or correcting ephemeris or almanac data within the receiver
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Abstract
The invention relates to a method and a system based on a big dipper short message precision track and clock correction broadcasting. The method comprises steps of performing difference processing on the positions of a satellite position of a precise ephemeris and a satellite position of a broadcasting ephemeris to generate coordinate correction in a protocol earth-fixing system XYZ direction, performing difference processing on the satellite clock difference of the precise ephemeris and the satellite clock difference of the broadcasting satellite, correspondingly converting the generated coordinate correction in the earth-fixing system XYZ direction to the radial direction, the tangential direction and the normal direction of the satellite, generating track correction information needed to be broadcasted, performing averaging processing on the generated clock difference correction to obtain an average value of the satellite difference correction, subtracting average value of the satellite clock difference correction from the satellite clock difference correction to obtain clock correction information to be broadcasted, and performing data encoding on the generated track correction information and obtained clock difference correction information to generate first information according to a first preset format. The invention improves the navigation positioning precision and greatly improves the shortcoming of poor precision of the broadcast ephemeris.
Description
Technical field
What the present invention relates to satellite navigation middle orbit and clock correction broadcasts field, is specifically related to a kind of method and system broadcast based on Big Dipper short message Precise Orbit and clock correction.
Background technology
At present, the real-time track of known Navsat and clock correction utilize the Keplerian orbit parameter that obtains in broadcast ephemeris and orbit perturbation correction term to calculate, broadcast ephemeris directly can extract and use from satellite-signal, compared to the Ultrarapid ephemeris needing networking to obtain, broadcast ephemeris is still most popular ephemeris source in real-time and non-precision positioning, but the satellite orbit calculated by broadcast ephemeris and clock correction precision not high, the quality of satellite ephemeris is the key of Positioning Accuracy of Satellite Navigation System and reliability, its error also will directly affect the precision of user's navigator fix.Wide area precision differential technology can effectively improve user's navigation and positioning accuracy, but WAAS-Wide Area Augmentation System common at present is mainly broadcast gps satellite system difference information, does not comprise the difference information of dipper system.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of message, the method and system broadcast based on Big Dipper short message Precise Orbit and clock correction, to overcome the problem of broadcast ephemeris low precision.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of method that Precise Orbit based on Big Dipper short message and clock correction are broadcast, and comprises the following steps,
S1, calculates the satellite position of precise ephemeris and the satellite clock correction of precise ephemeris according to precise ephemeris, calculates the satellite position of broadcast ephemeris and the satellite clock correction of broadcast ephemeris according to broadcast ephemeris simultaneously;
S2, the satellite position of the satellite position of precise ephemeris and broadcast ephemeris is done difference process is coordinate corrective value on XYZ direction with generating agreement admittedly, the satellite clock correction of precise ephemeris and the satellite clock correction of broadcast ephemeris is done to differ to process to generate clock error correction number simultaneously;
S3, be in the radial direction being transformed into satellite that coordinate corrective value on XYZ direction is corresponding respectively, tangential and normal direction admittedly by the ground of generation, generate the orbit correction information needing to broadcast, the clock error correction number of generation is obtained the mean value of satellite clock correction correction as average treatment simultaneously, and satellite clock correction correction is deducted the mean value of satellite clock correction correction, obtain the clock error correction information needing to broadcast;
S4, the orbit correction information generate step S3 and the clock error correction information of acquisition are carried out data encoding according to the first predetermined format and are generated the first message;
S5, sends to satellite by the first message, and is broadcast by the communication mode of passing of satelline Big Dipper short message.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the first predetermined format of described first message comprises the first message header and the first message body, described first message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; The satellite that described first message body comprises 75bits indicates number, the satellite length of time of every satellite 8bits, the radial correcting information of every satellite 9bits, the normal direction correcting information of every satellite 6bits, every satellite 9 or the tangential correcting information of 7bits, every satellite 11 or the clock error correction amount of 10bits and the CRC check code of 24bits; When satellite is GEO satellite, the tangential correcting information of satellite is 9bits, and the clock error correction amount of satellite is 11bits, and when satellite is the satellite except GEO satellite, the tangential correcting information of satellite is 7bits, and the clock error correction amount of satellite is 10bits.
Further, also comprise and broadcast the second message, when the second message broadcast by needs, the real-time clock error correction the information then first method according to step S3 generated and the clock error correction information in the first message broadcast are made difference and are processed, obtain the real-time clock correction correcting information needing to broadcast, carry out data encoding by needing the real-time clock correction correcting information of broadcasting according to the second predetermined format and generate the second message, finally the second message is sent to satellite, and broadcast by the communication mode of passing of satelline Big Dipper short message.
Further, the second predetermined format of described second message comprises the second message header and the second message body, described second message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described second message body comprises the clock error correction information of every satellite 5bits and the CRC check code of 24bits.
Further, also comprise and broadcast the 3rd message, when the 3rd message broadcast by needs, then first by the real-time orbit correction information of the corresponding generation of method difference according to step S3 and real-time clock error correction information, and correspondence and the orbit correction information in the first message broadcast and clock error correction information do poor process respectively, generate the real-time track correcting information and real-time clock correction correcting information that need to broadcast, then the real-time track correcting information needing to broadcast and real-time clock correction correcting information are carried out data encoding according to the 3rd predetermined format and generate the 3rd message, finally the 3rd message is sent to satellite, and broadcast by the communication mode of passing of satelline Big Dipper short message.
Further, the 3rd predetermined format of described 3rd message comprises the 3rd message header and the 3rd message body, described 3rd message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described 3rd message body comprises the CRC check code of the radial correcting information of every satellite 4bits, the normal direction correcting information of every satellite 4bits, the tangential correcting information of every satellite 4bits, the clock error correction information of every satellite 5bits and 24bits.
Further, be one broadcast the cycle from the broadcasting of the first message next time of broadcasting of first message, broadcast in the cycle same, second message is all identical with age phase of the first message for the length of time with the message of the 3rd message, and the broadcasting to be of described first message, the second message and the 3rd message is broadcast whole second.
The invention has the beneficial effects as follows: the method that a kind of Precise Orbit based on Big Dipper short message of the present invention and clock correction are broadcast, it is the transfer rate based on Big Dipper short message 78bytes per minute, can realize in 3 minutes to GPS and the Big Dipper dual system precise ephemeris of totally 30 satellites in view broadcast one and broadcast three times throughout precise clock correction, greatly improve the deficiency of broadcast ephemeris low precision, navigation user can obtain precise ephemeris and clock correction product and obtain high-precision locating effect under the condition without the need to networking.
Based on the method that above-mentioned a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast, the system that the present invention also provides a kind of Precise Orbit based on Big Dipper short message and clock correction to broadcast.
The system that a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast, comprise precise ephemeris computing module, broadcast ephemeris computing module, coordinate corrective value generation module, clock error correction number generation module, orbit correction information generating module, clock error correction information generating module, the first message generating module, the second message generating module, the 3rd message generating module and satellite release module
Described precise ephemeris computing module is used for calculating the satellite position of precise ephemeris and the satellite clock correction of precise ephemeris according to precise ephemeris;
Described broadcast ephemeris computing module is used for calculating the satellite position of broadcast ephemeris and the satellite clock correction of broadcast ephemeris according to broadcast ephemeris;
Described coordinate corrective value generation module is coordinate corrective value on XYZ direction for doing according to the satellite position of precise ephemeris and the satellite position of broadcast ephemeris that difference processes with generating agreement admittedly;
Described clock error correction number generation module is used for doing poor process according to the satellite clock correction of precise ephemeris and the satellite clock correction of broadcast ephemeris and generates clock error correction number;
Described orbit correction information generating module, for being the radial direction being transformed into satellite that coordinate corrective value on XYZ direction is corresponding respectively, tangential and normal direction admittedly according to the ground generated, generates the orbit correction information needing to broadcast;
Described clock error correction information generating module is used for the mean value obtaining satellite clock correction correction according to the clock error correction number generated as average treatment, and satellite clock correction correction is deducted the mean value of satellite clock correction correction, obtains the clock error correction information needing to broadcast;
Described first message generating module is used for carrying out data encoding according to the orbit correction information of generation and the clock error correction information of acquisition according to the first predetermined format and generates the first message;
Described second message generating module is used for processing according to real-time clock error correction information and the clock error correction information in the first message broadcast are made difference, obtain the real-time clock correction correcting information needing to broadcast, carry out data encoding by needing the real-time clock correction correcting information of broadcasting according to the second predetermined format and generate the second message;
Described 3rd message generating module is used for the orbit correction information in real-time orbit correction information and real-time clock error correction information respectively corresponding the first message with having broadcast and clock error correction information to do to differ to process, generate the real-time track correcting information and real-time clock correction correcting information that need to broadcast, the real-time track correcting information needing to broadcast and real-time clock correction correcting information are carried out data encoding according to the 3rd predetermined format and generates the 3rd message;
Described satellite release module is used for broadcasting the first message of generation and/or the second message and/or the 3rd message by the communication mode of Big Dipper short message.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the first predetermined format of described first message comprises the first message header and the first message body, described first message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; The satellite that described first message body comprises 75bits indicates number, the satellite length of time of every satellite 8bits, the radial correcting information of every satellite 9bits, the normal direction correcting information of every satellite 6bits, every satellite 9 or the tangential correcting information of 7bits, every satellite 11 or the clock error correction amount of 10bits and the CRC check code of 24bits; When satellite is GEO satellite, the tangential correcting information of satellite is 9bits, and the clock error correction amount of satellite is 11bits, and when satellite is the satellite except GEO satellite, the tangential correcting information of satellite is 7bits, and the clock error correction amount of satellite is 10bits;
Second predetermined format of described second message comprises the second message header and the second message body, described second message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described second message body comprises the clock error correction information of every satellite 5bits and the CRC check code of 24bits;
3rd predetermined format of described 3rd message comprises the 3rd message header and the 3rd message body, described 3rd message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described 3rd message body comprises the CRC check code of the radial correcting information of every satellite 4bits, the normal direction correcting information of every satellite 4bits, the tangential correcting information of every satellite 4bits, the clock error correction information of every satellite 5bits and 24bits.10. further according to claim 9, described synchronous code is for indicating the start bit of the first message, the second message and the 3rd message, described message number is used for the type of differentiation first message, the second message and the 3rd message, in described hour, second is for indicating the number of seconds in current hour, moment epoch of track and clock correction with hour in the mode of second identify.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method that a kind of Precise Orbit based on Big Dipper short message of the present invention and clock correction are broadcast;
Fig. 2 is dipper system satellite C06 orbital position error time history plot;
Fig. 3 is gps system satellite G21 orbital position error time history plot;
Clock correction information time history plot in the first message that Fig. 4 broadcasts for dipper system satellite C06;
Clock correction information time history plot in the first message that Fig. 5 broadcasts for gps system satellite G21;
Fig. 6 is the structured flowchart of the system that a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast.
Embodiment
Be described principle of the present invention and feature below in conjunction with accompanying drawing, example, only for explaining the present invention, is not intended to limit scope of the present invention.
First the present invention proposes the message that a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast.
The message that a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast, comprise first message with track and clock correction information, be associated with the first message and there is the second message of clock correction information and be associated with the first message and there is the 3rd message of track and clock correction information, described orbit correction information is make difference according to the satellite position of precise ephemeris and the satellite position of broadcast ephemeris to process and be admittedly coordinate corrective value on XYZ direction with generating agreement and be the radial direction being transformed into satellite that coordinate corrective value on XYZ direction is corresponding respectively admittedly by the ground of generation, the orbit correction information that tangential and normal direction generates, to be the satellite clock correction of precise ephemeris with the satellite clock correction of broadcast ephemeris do described clock error correction information that difference process generates clock error correction number and the clock error correction number that becomes of giving birth to is obtained the mean value of satellite clock correction correction and the clock error correction information obtained by the mean value that satellite clock correction correction deducts satellite clock correction correction as average treatment.Described first message is that orbit correction information and clock error correction information carry out the message of data encoding generation according to the first predetermined format; To be real-time clock error correction information with the clock error correction information in the first message broadcast does described second message differs from the clock error correction information that processes and obtain needing to broadcast and the real-time clock correction correcting information of being broadcast by needs carries out the message of data encoding generation according to the second predetermined format; Described 3rd message is that orbit correction information respectively in corresponding the first message with having broadcast of real-time orbit correction information and real-time clock error correction information and clock error correction information are made to differ from the real-time track correcting information and real-time clock correction correcting information that process and generate and need to broadcast and the real-time track correcting information needing to broadcast and real-time clock correction correcting information are carried out the message of data encoding generation according to the 3rd predetermined format; Described first message, the second message are communicating based on Big Dipper short message with broadcasting of the 3rd message;
First predetermined format of described first message comprises the first message header and the first message body, and the second predetermined format of described second message comprises the second message header and the second message body, and the 3rd predetermined format of described 3rd message comprises the 3rd message header and the 3rd message body,
Described first message header, the second message header are all the same with the form of the 3rd message header, its form is as shown in table 1, described first message header, the second message header and the 3rd message header include the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second.
Table 1
Wherein synchronous code is used for indicating the start bit of every bar message, and these 3 bytes are respectively 0xAA, 0x53,0x44 with hexadecimal representation; Message number is used for the different message of differentiation three class and is expressed as 1,2,3, and 1 represents the first message, and 2 represent the second message, and 3 represent the 3rd message; Message is followed successively by 0,1,2 according to the cycle of broadcasting of message the length of time, and represent that this message is unavailable when message length of time is 3, same data age of broadcasting the second message and the 3rd message in the cycle should be consistent with age data phase of the first message; In hour, second indicates the number of seconds in current hour, and this message format is only applicable to broadcast whole second.
First message body of described first message is as shown in table 2, the satellite comprising 75bits indicates number, the satellite length of time of every satellite 8bits, the radial correcting information of every satellite 9bits, the normal direction correcting information of every satellite 6bits, every satellite 9 or 7bits tangential correcting information (wherein GEO satellite is 9bits, other satellites are 7bits), (wherein GEO satellite is 11bits for the clock error correction amount of every satellite 11 or 10bits, other satellites are 10bits) and the CRC check code of 24bits, the first message body is 1314bits altogether;
Table 2
Its Satellite indicates the satellite number number being used for broadcasting in sign first message, 1 to No. 32 satellites of the 1st the corresponding GPS of bit to the 32nd bit, 33rd bit retains to the 37th bit, 1 to No. 35 satellites of the 38th the corresponding Big Dipper of bit to the 72nd bit, 73bit to 75bit retains, 1 represents the correcting information of broadcasting corresponding satellite, and 0 expression is not broadcast;
Second message body of described second message comprises the clock error correction information of every satellite 5bits and the CRC check code of 24bits, and the second message body 174bits altogether of described second message, the form of the second message body of described second message is as shown in table 3.
Table 3
3rd message body of described 3rd message comprises the CRC check code of the radial correcting information of every satellite 4bits, the normal direction correcting information of every satellite 4bits, the tangential correcting information of every satellite 4bits, the clock error correction information of every satellite 5bits and 24bits, the 3rd message body 534bits altogether of described 3rd message, the form of the 3rd message body of described 3rd message is as shown in table 4.
Table 4
Based on the message that above-mentioned a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast, the method that a kind of Precise Orbit based on Big Dipper short message of the present invention and clock correction are broadcast is as follows.
As shown in Figure 1, a kind of method that Precise Orbit based on Big Dipper short message and clock correction are broadcast, comprises the following steps,
First, calculate the satellite position of precise ephemeris and the satellite clock correction of precise ephemeris according to precise ephemeris, calculate the satellite position of broadcast ephemeris and the satellite clock correction of broadcast ephemeris according to broadcast ephemeris simultaneously.Precise ephemeris can obtain according to the observation data process of tracking station's real-time Transmission or download from IGS website and obtain.
Then, the satellite position of the satellite position of precise ephemeris and broadcast ephemeris is done difference process is coordinate corrective value on XYZ direction with generating agreement admittedly, the satellite clock correction of precise ephemeris and the satellite clock correction of broadcast ephemeris is done to differ to process to generate clock error correction number simultaneously.Because the reference position of precise ephemeris satellite is the barycenter of satellite, and the reference position of broadcast ephemeris satellite is the antenna phase center of satellite, gets on so the satellite position calculated by precise ephemeris needs to be transformed into antenna phase center.
Then, be in the radial direction being transformed into satellite that coordinate corrective value on XYZ direction is corresponding respectively, tangential and normal direction admittedly by the ground of generation, generate the orbit correction information needing to broadcast, the clock error correction number of generation is obtained the mean value of satellite clock correction correction as average treatment simultaneously, and satellite clock correction correction is deducted the mean value of satellite clock correction correction, obtain the clock error correction information needing to broadcast.Error having the greatest impact to user for navigation user in satellite radial direction, due to satellite transmission limited bandwidth available, in order to effectively utilize transmission bandwidth, high in the comparatively tangential and normal direction of resolution in described message format Satellite radial direction, therefore need coordinate corrective value to be converted to the radial direction of satellite, tangentially and in normal direction broadcast; In navigation user in the process of locating, this clock correction mean value can be received machine clock correction and absorb, and can not have an impact to the positioning result of user.
Again, the orbit correction information of generation and the clock error correction information of acquisition are carried out data encoding according to the first predetermined format described above and generate the first message.In first message format, every satellite comprises ephemeris length of time, and this value equals the IODE value of the broadcast ephemeris adopted when correcting information generates, and user chooses correct broadcast ephemeris according to this value and recovers the coordinate of satellite and clock correction.
Finally, the first message is sent to satellite, and broadcast by the communication mode of passing of satelline Big Dipper short message.
When the second message broadcast by needs, then first the real-time clock error correction information generated according to above-mentioned method and the clock error correction information in the first message broadcast are made difference to process, obtain the real-time clock correction correcting information needing to broadcast, then the second message is generated by needing the real-time clock correction correcting information of broadcasting to carry out data encoding according to above-mentioned second predetermined format, namely the clock correction information in the second message must be recovered by the clock correction information in the first message, finally the second message is sent to satellite, and broadcast by the communication mode of passing of satelline Big Dipper short message.When the 3rd message broadcast by needs, then first distinguish the real-time orbit correction information of corresponding generation and real-time clock error correction information by according to above-mentioned method, and correspondence and the orbit correction information in the message broadcast and clock error correction information do poor process respectively, generate real-time track correcting information and real-time clock correction correcting information, then real-time track correcting information and real-time clock correction correcting information are carried out data encoding according to the 3rd predetermined format described above and generate the 3rd message, namely track in the 3rd message and clock correction information must be recovered by the track in the first message and clock correction information, finally the 3rd message is sent to satellite, and broadcast by the communication mode of passing of satelline Big Dipper short message.
The broadcasting to be of described first message, the second message and the 3rd message is broadcast whole second.Be one broadcast the cycle from the broadcasting of the first message next time of broadcasting of first message, broadcast in the cycle same, second message is all identical with age phase of the first message for the length of time with the message of the 3rd message, so that user correctly can identify the first message for the track in recovery second message and the 3rd message and clock correction information.
Because Big Dipper short message available transmission rate is 78bytes per minute, bandwidth is very limited, and the difficult point of method that therefore a kind of Precise Orbit based on Big Dipper short message of the present invention and clock correction are broadcast is how to upgrade the ephemeris of more gps satellite and big-dipper satellite and clock correction as far as possible in limited bandwidth and under ensureing ephemeris and clock correction precision.The method that a kind of Precise Orbit based on Big Dipper short message of the present invention and clock correction are broadcast realizes based on Big Dipper short message Principle of Communication, according to the bandwidth calculation of Big Dipper short message 78bytes per minute, originally mode of broadcasting can be implemented in 3 minutes and broadcasts one time to the precise ephemeris of GPS and Big Dipper dual system totally 30 satellites, and broadcasts three times to precise clock correction simultaneously.
Broadcast in the cycle same, the clock correction information of the second message that user receives divided by the second message and the first message hour in the difference of second, obtain the rate of change of clock correction information; User according to current time hour in number of seconds and the second message hour in number of seconds poor, the rate of change that this difference is multiplied by clock correction information adds the clock correction information of the second message, can calculate the clock correction information of user's current time.
Broadcast in the cycle same, the clock correction information of the 3rd message that user receives and the clock correction information of the second message poor, then divided by the 3rd message and the second message hour in the difference of second, obtain the rate of change of clock correction information; User according to current time hour in number of seconds and the 3rd message hour in number of seconds poor, the rate of change that this difference is multiplied by clock correction information adds the clock correction information of the 3rd message, can calculate the clock correction information of user's current time.
Broadcast in the cycle same, the orbit information of the 3rd message that user receives divided by the 3rd message and the first message hour in the difference of second, obtain the rate of change of orbit information; User according to current time hour in number of seconds and the 3rd message hour in number of seconds poor, the rate of change that this difference is multiplied by orbit information adds the orbit information of the 3rd message, can calculate the orbit information of user's current time.
According to precise ephemeris and the clock correction product on March 27th, 2015, the method that the method broadcast according to a kind of Precise Orbit based on Big Dipper short message of the present invention and clock correction proposes is carried out data and is broadcast, and user obtains precision positions and the clock correction of satellite.Fig. 2 and Fig. 3 is respectively the error variation diagram in time of any time satellite position of extrapolating after user receives dipper system satellite C06 and gps system satellite G21 satellite ephemeris, as can be seen from the figure, its error increases with the increase of extrapolation time delay, even if time delay reaches 5 minutes, the error of its extrapolation satellite position also can ensure at 2 cm.Fig. 4 and Fig. 5 is respectively clock correction information situation over time in the first message that dipper system satellite C06 and gps system satellite G21 broadcasts, the step phenomenon occurred in figure is because the change of broadcast ephemeris causes, and the clock correction proposed according to the present invention is as seen from the figure broadcast form and normally can be broadcast clock correction data under guarantee clock correction precision.
Based on the method that above-mentioned a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast, the system that the present invention also provides a kind of Precise Orbit based on Big Dipper short message and clock correction to broadcast.
As shown in Figure 6, the system that a kind of Precise Orbit based on Big Dipper short message and clock correction are broadcast, comprise precise ephemeris computing module, broadcast ephemeris computing module, coordinate corrective value generation module, clock error correction number generation module, orbit correction information generating module, clock error correction information generating module, the first message generating module, the second message generating module, the 3rd message generating module and satellite release module
Described precise ephemeris computing module is used for calculating the satellite position of precise ephemeris and the satellite clock correction of precise ephemeris according to precise ephemeris;
Described broadcast ephemeris computing module is used for calculating the satellite position of broadcast ephemeris and the satellite clock correction of broadcast ephemeris according to broadcast ephemeris;
Described coordinate corrective value generation module is coordinate corrective value on XYZ direction for doing according to the satellite position of precise ephemeris and the satellite position of broadcast ephemeris that difference processes with generating agreement admittedly;
Described clock error correction number generation module is used for doing poor process according to the satellite clock correction of precise ephemeris and the satellite clock correction of broadcast ephemeris and generates clock error correction number;
Described orbit correction information generating module, for being the radial direction being transformed into satellite that coordinate corrective value on XYZ direction is corresponding respectively, tangential and normal direction admittedly according to the ground generated, generates the orbit correction information needing to broadcast;
Described clock error correction information generating module is used for the mean value obtaining satellite clock correction correction according to the clock error correction number generated as average treatment, and satellite clock correction correction is deducted the mean value of satellite clock correction correction, obtains the clock error correction information needing to broadcast;
Described first message generating module is used for carrying out data encoding according to the orbit correction information of generation and the clock error correction information of acquisition according to the first predetermined format and generates the first message;
Described second message generating module is used for processing according to real-time clock error correction information and the clock error correction information in the first message broadcast are made difference, obtain the real-time clock correction correcting information needing to broadcast, carry out data encoding by needing the real-time clock correction correcting information of broadcasting according to the second predetermined format and generate the second message;
Described 3rd message generating module is used for the orbit correction information in real-time orbit correction information and real-time clock error correction information respectively corresponding the first message with having broadcast and clock error correction information to do to differ to process, generate the real-time track correcting information and real-time clock correction correcting information that need to broadcast, the real-time track correcting information needing to broadcast and real-time clock correction correcting information are carried out data encoding according to the 3rd predetermined format and generates the 3rd message;
Described satellite release module is used for broadcasting the first message of generation and/or the second message and/or the 3rd message by the communication mode of Big Dipper short message.
First predetermined format of described first message comprises the first message header and the first message body, described first message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; The satellite that described first message body comprises 75bits indicates number, the satellite length of time of every satellite 8bits, the radial correcting information of every satellite 9bits, the normal direction correcting information of every satellite 6bits, every satellite 9 or the tangential correcting information of 7bits, every satellite 11 or the clock error correction amount of 10bits and the CRC check code of 24bits; When satellite is GEO satellite, the tangential correcting information of satellite is 9bits, and the clock error correction amount of satellite is 11bits, and when satellite is the satellite except GEO satellite, the tangential correcting information of satellite is 7bits, and the clock error correction amount of satellite is 10bits; Second predetermined format of described second message comprises the second message header and the second message body, described second message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described second message body comprises the clock error correction information of every satellite 5bits and the CRC check code of 24bits; 3rd predetermined format of described 3rd message comprises the 3rd message header and the 3rd message body, described 3rd message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described 3rd message body comprises the CRC check code of the radial correcting information of every satellite 4bits, the normal direction correcting information of every satellite 4bits, the tangential correcting information of every satellite 4bits, the clock error correction information of every satellite 5bits and 24bits.
Described synchronous code is for indicating the start bit of the first message, the second message and the 3rd message, described message number is used for the type of differentiation first message, the second message and the 3rd message, in described hour, second is for indicating the number of seconds in current hour, moment epoch of track and clock correction with hour in the mode of second identify.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1., based on the method that Precise Orbit and the clock correction of Big Dipper short message are broadcast, it is characterized in that: comprise the following steps,
S1, calculates the satellite position of precise ephemeris and the satellite clock correction of precise ephemeris according to precise ephemeris, calculates the satellite position of broadcast ephemeris and the satellite clock correction of broadcast ephemeris according to broadcast ephemeris simultaneously;
S2, the satellite position of the satellite position of precise ephemeris and broadcast ephemeris is done difference process is coordinate corrective value on XYZ direction with generating agreement admittedly, the satellite clock correction of precise ephemeris and the satellite clock correction of broadcast ephemeris is done to differ to process to generate clock error correction number simultaneously;
S3, be in the radial direction being transformed into satellite that coordinate corrective value on XYZ direction is corresponding respectively, tangential and normal direction admittedly by the ground of generation, generate the orbit correction information needing to broadcast, the clock error correction number of generation is obtained the mean value of satellite clock correction correction as average treatment simultaneously, and satellite clock correction correction is deducted the mean value of satellite clock correction correction, obtain the clock error correction information needing to broadcast;
S4, the orbit correction information generate step S3 and the clock error correction information of acquisition are carried out data encoding according to the first predetermined format and are generated the first message;
S5, sends to satellite by the first message, and is broadcast by the communication mode of passing of satelline Big Dipper short message.
2. the method broadcast of a kind of Precise Orbit based on Big Dipper short message according to claim 1 and clock correction, it is characterized in that: the first predetermined format of described first message comprises the first message header and the first message body, described first message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; The satellite that described first message body comprises 75bits indicates number, the satellite length of time of every satellite 8bits, the radial correcting information of every satellite 9bits, the normal direction correcting information of every satellite 6bits, every satellite 9 or the tangential correcting information of 7bits, every satellite 11 or the clock error correction amount of 10bits and the CRC check code of 24bits; When satellite is GEO satellite, the tangential correcting information of satellite is 9bits, and the clock error correction amount of satellite is 11bits, and when satellite is the satellite except GEO satellite, the tangential correcting information of satellite is 7bits, and the clock error correction amount of satellite is 10bits.
3. the method broadcast of a kind of Precise Orbit based on Big Dipper short message according to claim 1 and 2 and clock correction, it is characterized in that: also comprise and broadcast the second message, when the second message broadcast by needs, the real-time clock error correction the information then first method according to step S3 generated and the clock error correction information in the first message broadcast are made difference and are processed, obtain the real-time clock correction correcting information needing to broadcast, carry out data encoding by needing the real-time clock correction correcting information of broadcasting according to the second predetermined format and generate the second message, finally the second message is sent to satellite, and broadcast by the communication mode of passing of satelline Big Dipper short message.
4. the method broadcast of a kind of Precise Orbit based on Big Dipper short message according to claim 3 and clock correction, it is characterized in that: the second predetermined format of described second message comprises the second message header and the second message body, described second message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described second message body comprises the clock error correction information of every satellite 5bits and the CRC check code of 24bits.
5. the method that a kind of Precise Orbit based on Big Dipper short message according to claim 1 or 2 or 4 and clock correction are broadcast, it is characterized in that: also comprise and broadcast the 3rd message, when the 3rd message broadcast by needs, then first by the real-time orbit correction information of the corresponding generation of method difference according to step S3 and real-time clock error correction information, and correspondence and the orbit correction information in the first message broadcast and clock error correction information do poor process respectively, generate the real-time track correcting information and real-time clock correction correcting information that need to broadcast, then the real-time track correcting information needing to broadcast and real-time clock correction correcting information are carried out data encoding according to the 3rd predetermined format and generate the 3rd message, finally the 3rd message is sent to satellite, and broadcast by the communication mode of passing of satelline Big Dipper short message.
6. the method broadcast of a kind of Precise Orbit based on Big Dipper short message according to claim 5 and clock correction, it is characterized in that: the 3rd predetermined format of described 3rd message comprises the 3rd message header and the 3rd message body, described 3rd message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described 3rd message body comprises the CRC check code of the radial correcting information of every satellite 4bits, the normal direction correcting information of every satellite 4bits, the tangential correcting information of every satellite 4bits, the clock error correction information of every satellite 5bits and 24bits.
7. the method broadcast of a kind of Precise Orbit based on Big Dipper short message according to claim 6 and clock correction, it is characterized in that: be one broadcast the cycle from the broadcasting of the first message next time of broadcasting of first message, broadcast in the cycle same, second message is all identical with age phase of the first message for the length of time with the message of the 3rd message, and the broadcasting to be of described first message, the second message and the 3rd message is broadcast whole second.
8. the system broadcast of the Precise Orbit based on Big Dipper short message and clock correction, it is characterized in that: comprise precise ephemeris computing module, broadcast ephemeris computing module, coordinate corrective value generation module, clock error correction number generation module, orbit correction information generating module, clock error correction information generating module, the first message generating module, the second message generating module, the 3rd message generating module and satellite release module
Described precise ephemeris computing module is used for calculating the satellite position of precise ephemeris and the satellite clock correction of precise ephemeris according to precise ephemeris;
Described broadcast ephemeris computing module is used for calculating the satellite position of broadcast ephemeris and the satellite clock correction of broadcast ephemeris according to broadcast ephemeris;
Described coordinate corrective value generation module is coordinate corrective value on XYZ direction for doing according to the satellite position of precise ephemeris and the satellite position of broadcast ephemeris that difference processes with generating agreement admittedly;
Described clock error correction number generation module is used for doing poor process according to the satellite clock correction of precise ephemeris and the satellite clock correction of broadcast ephemeris and generates clock error correction number;
Described orbit correction information generating module, for being the radial direction being transformed into satellite that coordinate corrective value on XYZ direction is corresponding respectively, tangential and normal direction admittedly according to the ground generated, generates the orbit correction information needing to broadcast;
Described clock error correction information generating module is used for the mean value obtaining satellite clock correction correction according to the clock error correction number generated as average treatment, and satellite clock correction correction is deducted the mean value of satellite clock correction correction, obtains the clock error correction information needing to broadcast;
Described first message generating module is used for carrying out data encoding according to the orbit correction information of generation and the clock error correction information of acquisition according to the first predetermined format and generates the first message;
Described second message generating module is used for processing according to real-time clock error correction information and the clock error correction information in the first message broadcast are made difference, obtain the real-time clock correction correcting information needing to broadcast, carry out data encoding by needing the real-time clock correction correcting information of broadcasting according to the second predetermined format and generate the second message;
Described 3rd message generating module is used for the orbit correction information in real-time orbit correction information and real-time clock error correction information respectively corresponding the first message with having broadcast and clock error correction information to do to differ to process, generate the real-time track correcting information and real-time clock correction correcting information that need to broadcast, the real-time track correcting information needing to broadcast and real-time clock correction correcting information are carried out data encoding according to the 3rd predetermined format and generates the 3rd message;
Described satellite release module is used for broadcasting the first message of generation and/or the second message and/or the 3rd message by the communication mode of Big Dipper short message.
9. the system broadcast of a kind of Precise Orbit based on Big Dipper short message according to claim 8 and clock correction, is characterized in that:
First predetermined format of described first message comprises the first message header and the first message body, described first message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; The satellite that described first message body comprises 75bits indicates number, the satellite length of time of every satellite 8bits, the radial correcting information of every satellite 9bits, the normal direction correcting information of every satellite 6bits, every satellite 9 or the tangential correcting information of 7bits, every satellite 11 or the clock error correction amount of 10bits and the CRC check code of 24bits; When satellite is GEO satellite, the tangential correcting information of satellite is 9bits, and the clock error correction amount of satellite is 11bits, and when satellite is the satellite except GEO satellite, the tangential correcting information of satellite is 7bits, and the clock error correction amount of satellite is 10bits;
Second predetermined format of described second message comprises the second message header and the second message body, described second message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described second message body comprises the clock error correction information of every satellite 5bits and the CRC check code of 24bits;
3rd predetermined format of described 3rd message comprises the 3rd message header and the 3rd message body, described 3rd message header comprise the synchronous code of 24bits, the message number of 2bits, the message length of time of 2bits and 12bits hour in second; Described 3rd message body comprises the CRC check code of the radial correcting information of every satellite 4bits, the normal direction correcting information of every satellite 4bits, the tangential correcting information of every satellite 4bits, the clock error correction information of every satellite 5bits and 24bits.
10. the system broadcast of a kind of Precise Orbit based on Big Dipper short message according to claim 9 and clock correction, it is characterized in that: described synchronous code is for indicating the start bit of the first message, the second message and the 3rd message, described message number is used for the type of differentiation first message, the second message and the 3rd message, in described hour, second is for indicating the number of seconds in current hour, moment epoch of track and clock correction with hour in the mode of second identify.
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