CN101909070B - Broadcasting method of real-time accurate satellite positioning product - Google Patents
Broadcasting method of real-time accurate satellite positioning product Download PDFInfo
- Publication number
- CN101909070B CN101909070B CN 201010104644 CN201010104644A CN101909070B CN 101909070 B CN101909070 B CN 101909070B CN 201010104644 CN201010104644 CN 201010104644 CN 201010104644 A CN201010104644 A CN 201010104644A CN 101909070 B CN101909070 B CN 101909070B
- Authority
- CN
- China
- Prior art keywords
- orb
- clk
- clock correction
- pre0
- positioning product
- 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.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000012937 correction Methods 0.000 claims description 49
- 238000007689 inspection Methods 0.000 claims description 12
- 101100094099 Schizosaccharomyces pombe (strain 972 / ATCC 24843) rsc4 gene Proteins 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- IWUCXVSUMQZMFG-AFCXAGJDSA-N Ribavirin Chemical group 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
- 238000004891 communication Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 101000699762 Homo sapiens RNA 3'-terminal phosphate cyclase Proteins 0.000 description 1
- 102100029143 RNA 3'-terminal phosphate cyclase Human genes 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013144 data compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000005433 ionosphere Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Landscapes
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention belongs to the technical field of satellite navigation, in particular to a broadcasting method of a satellite real-time accurate positioning product. Satellite positioning information is separated into a large number and a small number according to the height above or below a hundred meter at a server end, and a client end recovers an identical accurate positioning product through the large number acquired from broadcast ephemeris and the small number transferred by the server. The invention can solve the problems of failure or reduced accuracy of a high-accuracy differential product, and the like caused by the inconsistence for upgrading the broadcasting ephemeris of the server and the client end and the inconsistence between a server and client end software algorithm module and a truncation error.
Description
Technical field
The present invention relates to the Satellite Navigation Technique field, specifically a kind of broadcasting method of real-time accurate satellite positioning product.
Background technology
At present, decimeter grade wide area real-time accurate location systems art is cutting edge technology and the study hotspot of GNSS application.This system moves base station and advanced person's real-time accurate locating information treatment system by the real-time continuous that is evenly distributed on a small quantity, broadcast real-time accurate positioning product information by the satellite-based enhancement method, can increase substantially satellite navigation system in the navigation Service precision, availability, continuity and the integrity that strengthen signal coverage areas.
Wherein, broadcasting of precision positioning product (comprising real-time track and clock correction) is an important ring in the wide area real-time accurate navigation system, generally adopt at present the communication mode of synchronous satellite, adopt this communication mode to cause broadcasting bandwidth and become a kind of important resource, therefore when design precision positioning product is broadcast form, need to consider do not reducing the information of broadcasting and weakening under the prerequisite of precision of information, reduce as far as possible and broadcast field length to reduce cost of serving.For this kind situation, at present the RTCA form that adopts of U.S. WASS, European EGNOS, Japanese MSAS system and the U.S. JPL whole world are produced minute GPS form etc. and are all chosen the mode of carrying out difference with broadcast ephemeris, by broadcasting the differential corrections with respect to broadcast ephemeris, the requirement of broadcasting field with minimizing.
Although above-mentioned form can reduce the pressure to bandwidth on amount of information, but guarantee that precision and the prerequisite of reliability are to broadcast that to hold be that the value of the data processing centre of server and the receiving terminal satellite orbit clock correction that to be user side resolve by broadcast ephemeris is identical, this is just implying two restrictive conditions:
1. guarantee to broadcast end and adopt same group of broadcast ephemeris parameter with the synchronous clock correction that receiving terminal calculates;
2. consistent with the method for clock correction based on the track of broadcast ephemeris calculating, comprise truncated error.
For guaranteeing condition 1, above-mentioned several method adopts the data age of relatively broadcasting in end and the receiving terminal broadcast ephemeris, guarantees to adopt same group of broadcast ephemeris.Although the method is feasible in the ordinary course of things, in fact, same satellite might have two groups of almanac datas within the same period in the GPS broadcast ephemeris, and the reference of two groups of parameters is constantly at a distance of 16 seconds.In this case, broadcast end and might receive respectively wherein one group of data with receiving terminal, and use always next the group almanac data renewal (after about 2 hours), make comparisons by data age thus, user side just existed in these 2 hours can't find the broadcast ephemeris consistent with broadcasting end, and can't use the high-precision difference information that end is broadcast of broadcasting.Identical problem can appear at the broadcast ephemeris updated time equally, end might occur broadcasting and upgrade early than receiving terminal, and receiving terminal can't use high-precision difference information equally in the case.
About condition 2, because the used software of server end and user side often is not the exploitation of same tissue or unit, is difficult to keep strict consistent in model and numerical precision thus, so also can introduces error, affect positioning accuracy.
Summary of the invention
Purpose of the present invention is exactly in order to overcome the weak point of above-mentioned background technology, and a kind of broadcasting method of real-time accurate satellite positioning product is provided, its is can settlement server inconsistent with the renewal of user side broadcast ephemeris, server and user side software algorithm model and truncated error is inconsistent and high-precision difference product that cause can't use or the problem such as precision reduction.
To achieve these goals, the broadcasting method of a kind of real-time accurate satellite positioning product provided by the invention, described precision positioning product comprises Precise Orbit information ORB
PreAnd clock correction information CLK
Pre, the method may further comprise the steps:
(1) server carries out quality inspection to the precision positioning product that obtains in current epoch, if repeating step (1) when next epoch is not passed through in check; If upcheck, then enter step (2); This step is in order to judge whether current its precision of precision positioning product of obtaining meets the transmission requirement.
(2) server intercepting Precise Orbit information ORB
PreAnd clock correction information CLK
PreHundred meters following numerical value in position, and this numerical value broadcast to user side as differential corrections.
(3) user side receives Precise Orbit information ORB
PreAnd clock correction information CLK
PreHundred meters following numerical value in position, add the satellite-orbit information ORB that synchronization calculates from broadcast ephemeris
Brd1And clock correction information CLK
Brd1Hundred meters positions and above numerical value, be combined into complete precision positioning product initial value, comprise orbit information ORB
Pre0And clock correction information CLK
Pre0
(4) user side carries out quality inspection to precision positioning product initial value, if check is not passed through, then proofreaies and correct Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0Hundred meters positions; If upcheck, then obtain the end value of precision positioning product.
In technique scheme, the described server of the method refers to have the end of broadcasting that the precision positioning product generates, broadcast ephemeris receives, data are processed, data are broadcast function; Described user side refers to have the receiving terminal that broadcast ephemeris receives, data are processed, server is broadcast the data receiver function.
In technique scheme, the quality inspection described in the step (1) is the Precise Orbit information ORB that will obtain
PreAnd clock correction information CLK
PreThe orbit information ORB that from broadcast ephemeris, calculates with synchronization
BrdAnd clock correction information CLK
BrdUtilize following formula to compare, wherein C represents the light velocity,
ΔORB＝|ORB
pre-ORB
brd|
ΔCLK＝|CLK
pre-CLK
brd|×C
If difference is counted Δ ORB, difference is counted Δ CLK greater than 30.0, judge that then the difference number is invalid, check is not passed through; If difference is counted Δ ORB, difference is counted Δ CLK less than or equal to 30.0, judge that then the difference number is effective, upcheck.Basis for estimation is to adopt under normal circumstances difference between the broadcast ephemeris in 6 hours track that calculates and the Precise Orbit of obtaining 10 meters magnitudes, and this is according to being present conclusion to drawing after the mass data analysis.
In technique scheme, the quality inspection described in the step (4) is with Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0The satellite-orbit information ORB that from broadcast ephemeris, calculates with synchronization
Brd1And clock correction information CLK
Brd1Utilize following formula to compare, wherein C represents the light velocity,
ΔORB0＝|ORB
pre0-ORB
brd1|
ΔCLK0＝|CLK
pre0-CLK
brd1|×C
If difference is counted Δ ORB
0, difference counts Δ CLK
0Greater than 30.0, judge that then the difference number is invalid, check is not passed through; If difference is counted Δ ORB
0, difference counts Δ CLK
0Less than or equal to 30.0, judge that then the difference number is effective, upcheck.Basis for estimation is to adopt under normal circumstances difference between the track that the broadcast ephemeris in 6 hours calculates and the Precise Orbit of the obtaining 10 meters magnitudes.
In technique scheme, described in the step (4) to Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0To proofread and correct be that the numerical value on hundred meters positions is added 1 or subtract 1 in hundred meters positions, count Δ ORB to satisfy difference
0, difference counts Δ CLK
0Requirement less than or equal to 30.0.
The broadcasting method of the real-time accurate satellite positioning product of the present invention prior art of comparing has following advantage:
One, the truncated error precision of assurance positioning product
The method is the pattern of " large number calculates; the decimal replacement " owing to what adopt, wherein " large number " refers to hundred meters positions and above numerical value, " decimal " refers to the numerical value that hundred meters positions are following, actual truncated error is " decimal " last represented unit, therefore, guaranteeing to broadcast basis that bandwidth meets the demands and can be as accurate as the truncated error of grade (0.003 nanosecond of clock correction) or Centimeter Level (0.03 nanosecond of clock correction).
Two, broadcast bandwidth requirement and greatly reduce
For the positioning product of broadcasting, broadcasting bandwidth and truncated error just is the contradiction point, and for complete track clock correction data, when guaranteeing millimetre-sized truncated error, the bandwidth that need to broadcast is just larger.In wide area real-time accurate navigation system, use geostationary satellite to position the issue of product, it is broadcast bandwidth and is no more than 1Kb, wherein also will reserve the part bandwidth in order to broadcast ionosphere product and redundant check information.Therefore, it is most important to broadcast data compression.
" large fractional part " is to be calculated by broadcast ephemeris in the method, so the bandwidth of its actual needs is determined by " fractional part " shared data bits.Data are actually hundred meters following data in position after treatment: if require then single component data only need to take 16 data bit take 1 millimeter as truncated error; If require then single component data only need to take 13 data bit take 1 centimetre as truncated error, take single epoch 32 satellites as example, the out of Memory such as removal time, consider that defending asterisk takies 6 data bit, then need respectively the bandwidth of broadcasting of 280 bytes and 232 bytes, greatly reduced broadcasting the requirement of bandwidth.
Three, guarantee the reliability of positioning product
Traditional when broadcasting difference information such as forms such as RTCA, broadcast bandwidth in order to reduce, broadcast the difference of the track clock correction of broadcast ephemeris, its orbit parameter is to add differential corrections by broadcast ephemeris result of calculation, but when broadcasting end and receiving terminal when existing broadcast ephemeris to upgrade the algorithm software of asynchronous or broadcast ephemeris Calculation of Satellite track and the inconsistent situation of truncated error, will so that the precision positioning Product Precision reduce or can't use.For the inventive method, need not strictly to compare by data age, only need broadcast end and in adjacent 6 hours, ephemeris be arranged with receiving terminal, different ephemeris piece result of calculation differences are only at meter level, can not have influence on the matching process of " large number " part, therefore, can recover to broadcast the track clock correction parameter that end calculates fully by the method for " large number calculates; decimal is replaced ", not lose any precision.
Four, shorten initialization time
Because the intrinsic characteristic of broadcast ephemeris, the complete broadcast ephemeris of reception needs 30 seconds time after the user starts shooting, for addressing this problem, some are broadcast end and can issue the user at the ephemeris that when start will last time store and use, if adopt like this differential correcting digital modeling, the unmatched problem of ephemeris that will exist last joint to exist.From the positioning requirements of decimeter grade, must obtain in 30 seconds-59 seconds could begin the location behind the new almanac data.Adopt the inventive method, when start blanking time (start constantly relatively unused time last time) less than 6 hours, and when the old broadcast ephemeris calculating track clock correction of upgrading and Precise Orbit clock correction more still can satisfy in 30 meters, old broadcast ephemeris can satisfy the requirement that precision positioning recovers required " large number " equally, can not take the time that obtains new broadcast ephemeris into account and realizes initialization.
Description of drawings
Fig. 1 is the flow chart of broadcasting of hundred meters following numerical value in position of the inventive method server end.
Fig. 2 is the recovery flow chart of the inventive method user side precision positioning product.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
The broadcasting method of real-time accurate satellite positioning product mainly splits into satellite positioning information up and down hundred meters positions " large number " and " decimal " by server end; " decimal " that user side is broadcast by the next server of broadcast ephemeris acquisition " large number " and reception recovers on all four precision positioning product.Wherein server end is broadcast flow process as shown in Figure 1, and user side recovers flow process as shown in Figure 2.The implementation step is as follows:
(1) server carries out quality inspection to the precision positioning product that observation data is obtained in current epoch, if repeating step (1) when next epoch is not passed through in check; If upcheck, then enter step (2);
(2) server intercepting Precise Orbit information ORB
PreAnd clock correction information CLK
PreHundred meters following numerical value in position, and this numerical value broadcast to user side as differential corrections;
(3) user side receives Precise Orbit information ORB
PreAnd clock correction information CLK
PreHundred meters following numerical value in position, add the satellite-orbit information ORB that synchronization calculates from broadcast ephemeris
Brd1And clock correction information CLK
Brd1Hundred meters positions and above numerical value, be combined into complete precision positioning product initial value, comprise orbit information ORB
Pre0And clock correction information CLK
Pre0
(4) user side carries out quality inspection to precision positioning product initial value, if check is not passed through, then proofreaies and correct Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0Hundred meters positions; If upcheck, then obtain the end value of precision positioning product.
Quality inspection described in the step (1) is the Precise Orbit information ORB that will obtain
PreAnd clock correction information CLK
PreThe orbit information ORB that from broadcast ephemeris, calculates with synchronization
BrdAnd clock correction information CLK
BrdUtilize following formula to compare, wherein C represents the light velocity,
ΔORB＝|ORB
pre-ORB
brd|
ΔCLK＝|CLK
pre-CLK
brd|×C
If Δ ORB, Δ CLK are greater than 30.0, then check is not passed through; If Δ ORB, Δ CLK then upcheck less than or equal to 30.0.
Quality inspection described in the step (4) is with Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0The satellite-orbit information ORB that from broadcast ephemeris, calculates with synchronization
Brd1And clock correction information CLK
Brd1Utilize following formula to compare, wherein C represents the light velocity,
ΔORB0＝|ORB
pre0-ORB
brd1|
ΔCLK0＝|CLK
pre0-CLK
brd1|×C
If Δ ORB
0, Δ CLK
0Greater than 30.0, then check is not passed through; If number Δ ORB
0, Δ CLK
0Less than or equal to 30.0, then upcheck.
Described in the step (4) to Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0To proofread and correct be that the numerical value on hundred meters positions is added 1 or subtract 1 in hundred meters positions, to satisfy Δ ORB
0, Δ CLK
0Requirement less than or equal to 30.0.
Below in conjunction with embodiment the inventive method is further described.Present embodiment adopts 0: 0: 0.0 on the 28th January in 2009, and No. 2 satellite precise orbit X component is example.It is as follows,
One. server
Obtaining Precise Orbit numerical value is: X precise=13888099.393m.
The first step: the satellite position X component that in broadcast ephemeris, calculates synchronization: Xbroadcast=13888101.188m;
Second step: quality inspection, with above-mentioned both ask poor dX=1.795m＜30m, both differences meet the requirements, quality inspection is passed through;
The 3rd step: the Precise Orbit numerical value that certainly obtains intercepts hundred meters following numerical value in position and is converted to millimeter and is unit, sends X send=99393mm=X right with integer form.
Two. user side
Receive hundred meters position following numerical value X right=99393mm of Precise Orbit clock correction.
The first step: calculate the track clock correction information of synchronization and extract hundred meters positions and above numerical value Xbroadcast1=13888101.588m from the broadcast ephemeris clock; X left=138881;
Second step: combination obtains accurate satellite fix product initial value Xprecise0=13888199.393m;
The 3rd step: Xprecise0 and Xbroadcast1 are asked poor, Xdif=Xprecise0-Xbroadcast1=97.805m＞30m.Check is not passed through, and needs hundred meters positions of corrected X precise0, therefore, here hundred meters bit value should be subtracted 1, can satisfy | Xdif|＜30, obtain after the Xprecise0 after proofreading and correct made up again: Xprecise1=13888099.393m, this value is the end value of Precise Orbit X component.
Claims (3)
1. the broadcasting method of real-time accurate satellite positioning product, described precision positioning product comprises Precise Orbit information ORB
PreAnd clock correction information CLK
Pre, it is characterized in that the method may further comprise the steps:
(1) server carries out quality inspection to the precision positioning product that obtains in current epoch, with the Precise Orbit information ORB that obtains
PreAnd clock correction information CLK
PreThe orbit information ORB that from broadcast ephemeris, calculates with synchronization
BrdAnd clock correction information CLK
BrdUtilize following formula to compare, wherein C represents the light velocity,
ΔORB＝|ORB
pre-ORB
brd|
ΔCLK＝|CLK
pre-CLK
brd|×C
If Δ ORB, Δ CLK are greater than 30.0, then check is not passed through; If Δ ORB, Δ CLK then upcheck less than or equal to 30.0; If repeating step (1) when next epoch is not passed through in check; If upcheck, then enter step (2);
(2) server intercepting Precise Orbit information ORB
PreAnd clock correction information CLK
PreHundred meters following numerical value in position, and this numerical value broadcast to user side;
(3) user side receives Precise Orbit information ORB
PreAnd clock correction information CLK
PreHundred meters following numerical value in position, add the satellite-orbit information ORB that synchronization calculates from broadcast ephemeris
Brd1And clock correction information CLK
Brd1Hundred meters positions and above numerical value, be combined into complete precision positioning product initial value, comprise orbit information ORB
Pre0And clock correction information CLK
Pre0
(4) user side carries out quality inspection to precision positioning product initial value, with Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0The satellite-orbit information ORB that from broadcast ephemeris, calculates with synchronization
Brd1And clock correction information CLK
Brd1Utilize following formula to compare, wherein C represents the light velocity,
ΔORB0＝|ORB
pre0-ORB
brd1|
ΔCLK0＝|CLK
pre0-CLK
brd1|×C
If Δ ORB 0, Δ CLK 0 are greater than 30.0, then check is not passed through; If number Δ ORB 0, Δ CLK 0 then upcheck less than or equal to 30.0; If check is not passed through, then proofread and correct Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0Hundred meters positions; If upcheck, then obtain the end value of precision positioning product.
2. the broadcasting method of real-time accurate satellite positioning product according to claim 1 is characterized in that: the end of broadcasting that the described server of the method refers to have the generation of precision positioning product, broadcast ephemeris receives, data are processed, data are broadcast function; Described user side refers to have the receiving terminal that broadcast ephemeris receives, data are processed, server is broadcast the data receiver function.
3. the broadcasting method of real-time accurate satellite positioning product according to claim 1 is characterized in that: described in the step (4) to Precise Orbit information ORB
Pre0And clock correction information CLK
Pre0To proofread and correct be that the numerical value on hundred meters positions is added 1 or subtract 1 in hundred meters positions, to satisfy Δ ORB 0, Δ CLK 0 less than or equal to 30.0 requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010104644 CN101909070B (en) | 2010-01-29 | 2010-01-29 | Broadcasting method of real-time accurate satellite positioning product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010104644 CN101909070B (en) | 2010-01-29 | 2010-01-29 | Broadcasting method of real-time accurate satellite positioning product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101909070A CN101909070A (en) | 2010-12-08 |
| CN101909070B true CN101909070B (en) | 2013-03-13 |
Family
ID=43264388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010104644 Expired - Fee Related CN101909070B (en) | 2010-01-29 | 2010-01-29 | Broadcasting method of real-time accurate satellite positioning product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101909070B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182374B (en) * | 2015-08-28 | 2018-02-13 | 山东鼎成卫星导航定位技术有限公司 | A kind of method and system broadcast based on Big Dipper short message Precise Orbit and clock correction |
| CN108152843B (en) * | 2017-11-15 | 2019-11-19 | 羲和时空（武汉）网络科技有限公司 | A kind of clock deviation data fusion calculation method of additional approximate steady datum |
| CN108761508A (en) * | 2018-03-09 | 2018-11-06 | 羲和时空（武汉）网络科技有限公司 | A kind of satellite position restores with satellite clock correction and track clock error correction number representation method |
| CN114710963A (en) * | 2020-11-05 | 2022-07-05 | 深圳市大疆创新科技有限公司 | Unmanned aerial vehicle positioning method and device, unmanned aerial vehicle and mobile platform |
| CN112711048B (en) * | 2020-12-15 | 2023-07-04 | 中山大学 | SSR transmission method and high-precision positioning system based on Beidou No. three RDSS short message |
| CN114051739A (en) * | 2021-09-29 | 2022-02-15 | 北京小米移动软件有限公司 | Method and device for reporting and receiving position related information |
| CN116990834A (en) * | 2023-07-07 | 2023-11-03 | 中国科学院空天信息创新研究院 | Real-time satellite precise orbit product precision evaluation method and device and electronic equipment |
| CN116667856A (en) * | 2023-08-01 | 2023-08-29 | 齐鲁空天信息研究院 | PPP-RTK product SSR deconstructing recoding method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101346604A (en) * | 2006-02-07 | 2009-01-14 | 全球定位有限公司 | Computing long term orbit and clock models with variable time-horizons |
| US7545317B2 (en) * | 2006-11-10 | 2009-06-09 | Sirf Technology, Inc. | Method and apparatus for navigation data downloads from weak signals |
| CN101520506A (en) * | 2008-02-26 | 2009-09-02 | 精工爱普生株式会社 | Position calculation method and position calculation system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7869948B2 (en) * | 2007-04-27 | 2011-01-11 | Sirf Technology, Inc. | Method and apparatus in positioning without broadcast ephemeris |
-
2010
- 2010-01-29 CN CN 201010104644 patent/CN101909070B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101346604A (en) * | 2006-02-07 | 2009-01-14 | 全球定位有限公司 | Computing long term orbit and clock models with variable time-horizons |
| US7545317B2 (en) * | 2006-11-10 | 2009-06-09 | Sirf Technology, Inc. | Method and apparatus for navigation data downloads from weak signals |
| CN101520506A (en) * | 2008-02-26 | 2009-09-02 | 精工爱普生株式会社 | Position calculation method and position calculation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101909070A (en) | 2010-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101909070B (en) | Broadcasting method of real-time accurate satellite positioning product | |
| CN110058287B (en) | Low-orbit satellite orbit determination method, device and system | |
| RU2752827C1 (en) | Method and system for differential correction of navigation | |
| CN111045034B (en) | GNSS multi-system real-time precise time transfer method and system based on broadcast ephemeris | |
| Dana | Global Positioning System (GPS) time dissemination for real-time applications | |
| Tang et al. | Improvement of orbit determination accuracy for Beidou navigation satellite system with two-way satellite time frequency transfer | |
| WO2018083803A1 (en) | Positioning augmentation device, positioning augmentation system, and positioning augmentation method | |
| CN108196272A (en) | A kind of satellite navigation positioning device and method based on real-time accurate One-Point Location | |
| EP2260319B1 (en) | Improved sbas receiver | |
| CN105158780A (en) | Navigation positioning method based on interchangeability of multiple navigation satellites | |
| CN105182374A (en) | Method and system based on big dipper short message precision track and clock correction broadcasting | |
| CN116243591B (en) | Subnanosecond time service method integrating UTC (k) and Beidou broadcast ephemeris | |
| CN104597747B (en) | Synchronous test system and its method for improving synchronization accuracy based on Tame Rubidium Clock | |
| US9562974B2 (en) | Multiple content message base-rover architecture | |
| CN111044972B (en) | GNSS precision time synchronization-based aircraft time difference positioning method and system | |
| LU102875B1 (en) | Method and system for synchronizing time among low earth orbit satellites | |
| CN114280644A (en) | PPP-B2B service-based precise point positioning system and method | |
| CN115993617B (en) | GNSS system time deviation monitoring method | |
| CN115407371B (en) | PPP-B2B-based real-time high-precision time transmission method and device | |
| CN115933356B (en) | High-precision time synchronization system and method for virtual atomic clock | |
| CN116882209B (en) | LEO real-time orbit determination random model construction method | |
| CN114286286B (en) | Time synchronization method, device, medium, and program product | |
| CN115951378B (en) | Self-adaptive information fusion positioning method based on Beidou satellite-based enhanced information | |
| CN115856945B (en) | Precise single-point time service method, device and medium suitable for GNSS multi-frequency points | |
| Liu et al. | Beidou wide-area augmentation system clock error correction and performance verification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 |