CN102629281A - Navigation message structure configurable method in GNSS (Global Navigation Satellite System) simulator - Google Patents
Navigation message structure configurable method in GNSS (Global Navigation Satellite System) simulator Download PDFInfo
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Abstract
The invention provides a navigation message structure configurable method in a GNSS (Global Navigation Satellite System) simulator. The navigation message structure configurable method comprises the following steps of: saving structural information on message parameters, including total length of a message main frame, message parameter names, parameter starting position and length, in a document/data library; pre-configuring a message structure; altering the message structure by a user according to requirements so as to change the position and the length of any message parameter; after the alternation is finished, performing correctness check on a message format configured by the user and storing through the simulator; and finally reading the message structure information through the GNSS simulator to perform simulation so as to generate a message bit stream corresponding to a simulation moment. According to the method, the problem of fixed message frame structure of a specific navigation system and a mode-specific satellite simulation signal in the conventional GNSS simulator is solved, convenient modification for the position and the length of the message parameters in the message frame structure by the user is supported, and GNSS simulator-based navigation message design research is effectively supported.
Description
Technical field
The invention belongs to the satellite navigation field, be specifically related to be used in a kind of GPS (GNSS) simulator support the configurable method of navigation message structure of navigation message design.
Background technology
The GNSS simulator is through the movement locus of dynamic similation Navsat constellation and satellite signal receiver carrier; Calculate the position of receiver in real time; And combine the real time position of satellite to judge satellite visibility; Calculate receiver real-time monitored amounts such as satellite-signal power, pseudorange, Doppler, carrier phase; Realize spreading code modulation and carrier modulation to the navigation message data with this, simulation produces the satellite navigation signals that receiver receives in the practical application scene, becomes the dummy source in satellite signal receiver development and the testing authentication.
Compare and directly utilize the real satellite signal, the GNSS simulator can provide the test condition of accurately controlled, reproducible simulated environment and improper situation, makes the efficiency of research and development of receiver be able to guarantee.Along with GPS System in USA modernization and Russian GLONASS system improve upgrading; And the construction of European Galileo system and China's Beidou satellite navigation system (above-mentioned GPS can be generally called the GNSS system), the GNSS simulator continues to receive the concern of industry and military service.
The external GNSS simulator of having developed multiple model; As; The GNSS simulator of the GSS series analog device of the GPS simulator of U.S. CAST company, Britain Spirent company, German IFEN company; But mostly function is fixed, and navigational satellite system, signal frequency point and structure, the strictness of carrier dynamic dispatching that can simulate are limited.
The analogue navigation text is one of important step of GNSS simulator; The navigation message data bit flow of each visible satellite under the selected navigational system pattern in the emulation period that the generation user is provided with; Modulate with corresponding carriers and spreading code that simulator produces, constitute complete satellite navigation simulating signal.In the GNSS of routine simulator, navigation message generates based on fixing text frame structure, and only text content of parameter and/or data bit can be revised, and also comprise the verification to the telegraph text data correctness.But under the condition that needs the design studies of GNSS simulator support navigation message, the pattern of this fixedly text frame structure is obviously no longer suitable.
Summary of the invention
The present invention is directed in the conventional GNSS simulator; Navigation message generates based on fixing text frame structure; And fixedly the inapplicable support of the pattern of text frame structure proposes the configurable method of navigation message structure in a kind of GNSS simulator based on the present situation of the navigation message design studies of GNSS simulator.
The present invention proposes the configurable method of navigation message structure in a kind of GNSS simulator, specifically realizes through following steps:
Step 1: the text structure is pre-configured.Specifically: the structural information of each text parameter in the pre-configured text structure with its initial default text structure as the GNSS simulator, is kept in file/database; The structural information of described text parameter comprises total length, text parameter title, parameter reference position and the length of text prime frame; Described initial default text structure is passed through the verification of message format correctness, and can directly be called by the GNSS simulator.
Step 2: whether judges selects to change the text structure, if not, and execution in step three, if, realizing the change of text structure through the text structural arrangements interface of GNSS simulator, execution in step three then.The user changes the text structure through the text structural arrangements interface of GNSS simulator; Change comprises position and the length that changes any text parameter; Wherein the change of position comprises two types: a text parameter is inserted into before another text parameter, the position of two text parameters is exchanged; After change was accomplished, the form of the text structure after the GNSS simulator disposes the user carried out the correctness verification, will write in file/database through the text structure of verification.
Step 3: the text structure is used.When the GNSS simulator starts simulation run; Read the text structural information in file/database, obtain the text supplemental characteristic, and the text supplemental characteristic is carried out the correctness verification; Judge the validity of concrete supplemental characteristic value; If verification is incorrect, provide error feedback information, suspend the operation of GNSS simulator; If verification is correct, then the GNSS simulator generates the navigation message bit stream constantly corresponding with emulation.
Method provided by the invention has the following advantages and good effect:
(1) the inventive method realizes the change according to user's setting with the position and the length of text parameter in the framework of frame structure; Solved in the conventional GNSS simulator for specific navigational system and the specific fixing problem of Satellite Simulation signal text frame structure of pattern; The GNSS simulator will be according to the message format after user's configuration; Generate corresponding navigation text bit stream; Standard GNSS simulator is expanded to the Software tool of navigation message design studies, in order to support navigation message design studies based on the GNSS simulator.
(2) generally the text structure is kept in the array of bottom most software with respect to GNSS simulator in the prior art; The problem that the user can't operate the array of simulator bottom; The structural information that the inventive method is preserved navigation message with file or database is supported the convenient modification of user to text parameter position and length in frame structure.
(3) the inventive method comprises the verification of user configured message format correctness, will show through user interface through the text frame structure of verification, has guaranteed the accuracy of text structure, effectively supports the text design studies.
Description of drawings
Fig. 1 is the schematic flow sheet of the configurable method of navigation message structure of the present invention;
Fig. 2 is the exemplary plot of navigation message structural arrangements of the present invention, wherein, (a) is the text structure before the configuration among the embodiment, (b) be that the text structure after disposing with length is inserted in the position among the embodiment, (c) is the text structure after place-exchange disposes among the embodiment.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment technical scheme of the present invention is elaborated.
The present invention provides the navigation message structure in a kind of GNSS simulator configurable method, and is as shown in Figure 1, specifically realizes through following steps:
Step 1: the text structure is pre-configured.For the text structure is provided with preconfigured information, preconfigured information is meant the structural information of text parameter, comprises the total length of text prime frame, and text parameter title, parameter reference position and length are kept at the structural information of text parameter in file or the database.The parameter reference position just is meant the reference position of text parameter in the text frame structure.Parameter length is meant that supplemental characteristic is converted to the shared length of bit field based on corresponding scale factor.
The structural information of the text parameter of being preserved has all been passed through the verification of message format correctness in advance, can directly be called by the GNSS simulator.Preconfigured information in this step will be as the initial default text structure of GNSS simulator, and this acquiescence text structure can show through the text structural arrangements interface of GNSS simulator.
Existing GNSS simulator is kept at the text structure in the array of bottom most software, and the user can't operate the array of bottom most software, promptly can not revise the text structure.With the structural information of file or database preservation text parameter, then the user can conveniently revise the text structure in the inventive method.
Step 2: whether judges selects to change the text structure, if not, and execution in step three, if, realizing the change of text structure through the text structural arrangements interface of GNSS simulator, execution in step three then.Change comprises position and the length that changes any text parameter, and after change was accomplished, the message format after the GNSS simulator disposes the user carried out the correctness verification, will write file/database through the text structure of verification.Step 2 specifically is divided into following steps.
Step 2.1: text structure change.If the user selects to change the text structure, then change the structural information of text parameter through the text structural arrangements interface of GNSS simulator.Present fixedly text frame structure; The number of text parameter, position and length are all constant; And the change in the inventive method can relate to the position of text parameter and the change of length, has solved fixedly the text frame structure and can not support the problem based on the navigation message design studies of GNSS simulator.Wherein, the change of position comprises two types: a text parameter is inserted into before another text parameter; The position of two text parameters is exchanged.The variation of text parameter position causes and this text parameters in situ is put and reposition between the reference position of whole text parameters all change, and the change of text parameter length causes the reference position of all text parameters after this text parameter to change.For this reason, the key of text structure change disposal route is to confirm to receive the new reference position of the text parameter that changes influence, and specifically be divided into three kinds of situation and confirm: position insertion, place-exchange and length change.
(a) insert the position.Parameter length also can change when parameter was carried out the position insertion; Original non-existent parameter in the text structure also can be incorporated in the text through inserting operation.Before the current location of text parameter j, insert text parameter i.
If text parameter i is existing parameter, then its new reference position is:
position_i_new＝position_j-length_i-m
i
Wherein, position_i_new representes the new reference position of text parameter i, and position_j representes the reference position of text parameter j, and length_i representes the bit length of text parameter i, m
iBe the multiple (comprising 0 times situation) of packet checks code length, m
iValue confirm according to the value of position_j-length_i: whether the value of judging position_j-length_i crosses over the block check code district, and if not, the new reference position of text parameter i remains on text parameter j place word, then m
iGet 0; If confirm that this value crosses over the number r in block check code district
i, the new reference position of text parameter i is reduced to the r before the word of text parameter j place
iIndividual word, then m
iGet (r
i* packet checks code length).The number in the leap block check code district described in the inventive method is an integer, and the number of crossing or fall into the block check code district according to the value of being judged obtains, and situation about falling into is regarded as crosses over a complete block check code district.The individual number average in the following leap block check code district that mentions is to adopt this method to obtain.
And corresponding change also takes place in the reference position of the whole parameters between the new reference position of text parameter i to the former reference position, and the reference position that these text parameters are new is:
position_n_new＝position_n_org-length_i-m
ni
Wherein, n representes to be inserted any text parameter that change influences, and position_n_new representes the new reference position of text parameter n, and position_n_org representes the former reference position of text parameter n, m
NiBe the multiple (comprising 0 times situation) of packet checks code length, m
NiValue confirm according to the value of position_n_org-length_i: judge whether the value of position_n_org-length_i crosses over the number in the block check code district and the block check code district of crossing over; If not; The new reference position of text parameter n remains on former place word, then m
NiGet 0; If cross over r
NiIndividual block check code district, the new reference position of text parameter n is reduced to the r before the word of former place
NiIndividual word, then m
NiGet (r
Ni* packet checks code length).
If text parameter i is new parameter, then its new reference position is: position_i_new=position_j.And corresponding change also takes place in the reference position of the whole parameters after the new reference position of text parameter i, and the reference position that these parameters are new is:
position_n_new＝position_n_org+length_i+m
2 ni
Wherein, m
2 NiMultiple (comprising 0 times situation) for the packet checks code length; Its value is confirmed according to the value of position_n_org+length_i: judge whether position_n_org+length_i crosses over the block check code district and the block check code district number of crossing over; If not; The new reference position of parameter n remains on former place word, then m
2 NiGet 0; If, the number r in definite block check code district of crossing over
Ni, the new reference position of text parameter n spills into the r after the word of former place
NiIndividual word, then m
2 NiGet (r
Ni* packet checks code length).
(b) place-exchange, text parameter i and j switch, behind the switch, reference position position_i_new and position_j_new that text parameter i and j are new are respectively:
position_i_new＝position_j_org+length_j-length_i±m
ij
position_j_new＝position_i_org
Wherein, Original position parameter formerly during i representes to exchange, during j representes to exchange original position after parameter, position_j_org representes the former reference position of text parameter j; Length_i representes the bit length of text parameter i, and length_j representes the bit length of parameter j.m
IjBe the multiple (comprising 0 times situation) of packet checks code length, m
IjValue confirm according to the value of position_j_org+length_j-length_i: whether the value of judging position_j_org+length_j-length_i crosses over the block check code district and the block check code district number of crossing over; If not; The new reference position of text parameter i remains on the former place of parameter j word, then m
IjGet 0; If, and cross over r
IjIndividual block check code district, m
Ij=r
Ij* packet checks code length, if length_j≤length_i, then the new reference position of text parameter i tapers to the r before the word of the former place of text parameter j
IjIndividual word is got-m
Ij, if length_j＞length_i gets+m
Ij, the new reference position of text parameter i spills into the r after the word of the former place of parameter j
IjIndividual word.
Corresponding change also takes place in the reference position of the whole text parameters between two exchange parameters, and the reference position that these text parameters are new is:
position_n_new＝position_n_org+length_j-length_i±m
nij
Wherein, n representes to be exchanged the arbitrary parameter that change influences, and position_n_new representes the new reference position of parameter n, and position_n_org representes the former reference position of parameter n.m
NijMultiple for the packet checks code length; Its value is confirmed according to the value of position_n_org+length_j-length_i: judge whether position_n_org+length_j-length_i crosses over the block check code district; If not; The new reference position of parameter n remains on former reference position place word, then m
NijGet 0; If confirm the block check code district number r that is crossed over
Nij, m
Nij=r
Nij* packet checks code length, if length_j≤length_i, then the new reference position of text parameter n tapers to the r before the word of former place
NijIndividual word is got-m
Nij, if length_j＞length_i gets+m
Ij, the new reference position of text parameter n spills into the r after the word of former place
NijIndividual word.
(c) change for length, the length of text parameter i is changed, the new reference position of each the text parameter after the text parameter i that then is modified is confirmed according to following formula:
position_n_new＝position_n_org-length_i_org+length_i_new±m
in
Wherein, I representes the parameter that length changes; N representes to receive the arbitrary parameter of parameter length change influence, and position_n_new representes the new reference position of parameter n, and position_n_org representes the former reference position of parameter n; Length_i_org representes the former bit length of parameter i, and length_i_new representes the bit length that parameter i is new.m
InMultiple (comprising 0 times situation) for the packet checks code length; Its value is confirmed according to the value of position_n_org-length_i_org+length_i_new: judge whether position_n_org-length_i_org+length_i_new crosses over the block check code district; If not; The new reference position of parameter n keeps former place word, then m
InGet 0; If confirm to cross over block check code district number r
In, m
In=r
In* check code length.If length_i_org>=length_i_new gets-m
In, then the new reference position of text parameter n tapers to former place word r before
InIndividual word; If length_i_org＜length_i_new gets+m
In, the new reference position of text parameter n spills into the r after the word of former place
InIndividual word.
Step 22: text structure verification.The user confirmed after the text structural modification was accomplished, and system carries out the correctness verification to the user configured text structure of process, and showed check results.The correctness verification of text structure is exactly to judge the total length that whether keeps pre-configured defined text prime frame after the text structure is changed.In a single day word length as group coding unit is confirmed; When then the text structure is changed; The parameter bit that in current word scope, reduces will be crossed over the block check code district and move in the current word word scope before, and the parameter bit that perhaps in current word scope, overflows will be crossed over the block check code district and move in the current word word scope afterwards.
Step 2.3: structural parameters are preserved.To write corresponding file/database through the text structural information of verification.
Step 3: the text structure is used.As shown in Figure 1, when the GNSS simulator starts simulation run, read the text structural information in file/database; Obtain the text supplemental characteristic, and the text supplemental characteristic is carried out the correctness verification, judge the validity of concrete supplemental characteristic value; If verification is incorrect, provide error feedback information, suspend the operation of GNSS simulator; If verification is correct, then the GNSS simulator generates the navigation message bit stream constantly corresponding with emulation, and the GNSS simulator carries out other simulation process then; For example, generate the carrier movement track, produce navigation signal, finish emulation then.
Embodiment
Utilizing the configurable method of navigation message structure provided by the invention, is example to produce navigation message structural arrangements result as shown in Figure 2, and with GPS NAV text topology example, concrete performing step is described.For GPS NAV text, the packet checks code length is 6 bits; The length of word is 30 than degree, and is to finish sign with the block check code; 10 words constitute a sub-frame, and subframe lengths is 300 bits; 5 sub-frame constitute a prime frame, and prime frame length is 1500 bits.
Step 1: the text structure is pre-configured.With the structural information of text parameter, comprise the total length of text prime frame, text parameter title, parameter reference position and length are kept in file/database.The text structure is passed through the verification of message format correctness in advance, can directly be called by the GNSS simulator.In the embodiment of the invention, the total length of text prime frame is 1500 bits.
The specific descriptions mode of text argument structure information can be any one modes such as XML file, TXT file or database.With the XML file is example, and the XML textual description of the text structure before the user disposes among (a) of Fig. 2 is as shown in table 1.
The XML textual description of text prime frame structure before table 1 configuration
Wherein, mainframe1 representes a prime frame structure of GPS NAV text; Name representes the title of text parameter, for example IODE, C
Rs, Δ n (Delta_n in the table 1), M
0, C
Us, A
1/2, t
OeIt all is the title of text parameter.Position representes the parameter reference position, and for example the reference position of parameter I ODE is the 361st bit place.Length representes the length of parameter, and for example the length of parameter I ODE is 8 bits.
Step 2: text structure user configuration.Text structural arrangements user interface through simulator realizes the change of text structure; Promptly change the position and the length of any text parameter; Message format after simulator disposes the user carries out the correctness verification, will write file/database through the text structure of verification.
Step 2.1: text structure change.Structural modification shown in (b) among Fig. 2 is that parameter I ODE is inserted into parametric t
OeBefore, and its length become 6 bits by 8 bits.Insert and length change situation this position that relates in the structure change.Calculating parameter IODE and parametric t in view of the above
OeNew reference position, parameter I ODE and parametric t
OeFormer reference position be respectively the 361st bit and the 571st bit in the prime frame structure.
Owing to insert for the position, the new reference position calculating formula of inserting parameter is:
position_i_new＝position_j-length_i-m
i
In the present embodiment, parameter i is IODE, and parameter j is t
Oe, the value of position_j_org is 571 bits, the value of length_i is 8 bits.And m
iValue is 6 bits, because position_j-length_i crosses over a block check code district, thereby the new reference position of parameter I ODE is reduced to parametric t
OeThe previous word of place word.Thus, the numerical value of position_i_new is 557 bits, and the reference position that promptly parameter I ODE is new is the 557th bit.
The reference position of other parameter also can be confirmed through following calculating formula thereupon between the former reference position of parameter I ODE to the new reference position:
position_n_new＝position_n_org-length_i-m
ni
In the present embodiment, respectively with parameters C
RsWith parameter Δ n be example, the situation of other parameter can be by that analogy.For parameters C
Rs, the value of position_n_org is 369 bits, the value of length_i is 8 bits, m
NiValue is 0, i.e. parameters C after the change
RsStill remain on former place word.For parameter Δ n, the value of position_n_org is 391 bits, m
NiValue is 6, and promptly the parameter Δ n after the change tapers to previous word by former place word.Thus, parameters C
RsBe respectively the 361st bit and the 377th bit with the new reference position of parameter Δ n.
And parametric t
OeNew reference position only depend on the change of parameter I ODE length, change the new reference position calculating formula of back parameter according to length:
position_j_new＝position_j_org-length_i_org+length_i_new±m
in
In the present embodiment, j is t
Oe, the value of position_j_org is 571 bits, and the value of length_i_org is 8 bits, and the value of length_i_new is 6 bits.And m
InValue is-6 bits, and position_j_org-length_i_org+length_i_new crosses over a block check code district, thus parametric t
OeBe reduced to its previous word by former place word.Thus, the numerical value of position_j_new is 563 bits, i.e. parametric t
OeNew reference position is the 563rd bit.
Structural modification shown in Fig. 2 (c) is with parameter I ODE and parametric t
OeThe position exchange, this relates to the place-exchange situation in the structure change.
Because for place-exchange, the new reference position calculating formula of exchange parameter is:
position_i_new＝position?j_org+length_j-length_i±m
ij
position_i_new＝position_i_org
In the present embodiment, i is IODE, and j is t
Oe, the value of position_j_org is 571 bits, and the value of length_j is 16 bits, and the value of length_i is 8 bits.And m
IjValue is 0 bit, and position_j_org+length_j-length_i still remains on former place word, and thus, the numerical value of position_j_new is 579 bits, and the reference position that promptly parameter I ODE is new is the 579th bit.And parametric t
OeNew reference position be the 361st bit.
And the former reference position of parameter I ODE is to parametric t
OeThe reference position of other parameter also can be confirmed through following calculating formula thereupon between the former reference position:
position_n_new＝position_n_org+length_j-length_i±m
nij
In the present embodiment, respectively with parameters C
RsWith parameter M
0Be example, the situation of other parameter can be by that analogy.For parameters C
Rs, the value of position_n_org is 369 bits, and the value of length_j is 16 bits, and the value of length_i is 8 bits, m
NijValue is 0, i.e. parameters C after the change
RsStill remain on former place word.For parameter M
0, the value of position_n_org is 407 bits, m
NijValue is+6, i.e. parameter M after the change
0Spill into a back word by former place word.Thus, parameters C
RsWith parameter M
0New reference position is respectively the 377th bit and the 421st bit.
Step 2.2: text structure verification.The user submitted to after the text structural modification was accomplished, and system carries out verification to the text structured data of submitting to.For GPS NAV, if total bit length of the pre-configured prime frame of user is 1500 bits, then its prime frame length of message format after user's configuration can not be greater than 1500 bits.If less than 1500 bits, then fill up with keeping the position.For like (b) among Fig. 2 with the structural modification (c), the correctness verification of text structure is passed through.
Step 2.3: structural parameters are preserved.To write corresponding file/database through the text structural information of verification.With the XML file is example, with (b) among Fig. 2 and (c) the corresponding user description of disposing back text structure, sees table 2 (a) and (b) respectively.
The XML textual description of insertion of table 2 (a) position and length configuration back text prime frame structure
Shown in table 2 (a), with respect to table 1, the reference position of parameter I ODE becomes the 557th bit place, and length has also become 6 bits, and the reference position that is positioned at the parameter after the origin-location of parameter I ODE also confirmed again, for example parameters C
RsReference position become the 361st bit place.
The XML textual description of table 2 (b) place-exchange configuration back text prime frame structure
Shown in table 2 (b), with respect to table 1, wherein, the reference position of parameter I ODE becomes the 579th bit place, parametric t
OeReference position become the 361st bit place, length has become 16 bits by 14 original bits, and the reference position of original other parameters between the 369th bit to the 579 bits also confirmed again, for example C
RsReference position become the 377th bit place.
Step 3: the text structure is used.When simulator starts simulation run; Read the text structural information in file/database; Obtain the text supplemental characteristic, carry out text supplemental characteristic correctness verification (judging the validity of concrete parameter value) simultaneously, the GNSS simulator generates the text bit stream constantly corresponding with emulation.
Claims (2)
1. the configurable method of navigation message structure in the GNSS simulator is characterized in that, comprises the steps:
Step 1: the text structure is pre-configured, and specifically: the structural information of each text parameter in the pre-configured text structure with its initial default text structure as the GNSS simulator, is kept in file/database; The structural information of described text parameter comprises total length, text parameter title, parameter reference position and the length of text prime frame; Described initial default text structure is passed through the verification of message format correctness, and can directly be called by the GNSS simulator;
Step 2: whether judges selects to change the text structure, and if not, execution in step three is if through the text structural arrangements interface change text structure of GNSS simulator, execution in step three then; Change text structure comprises position and the length that changes any text parameter, and wherein the change of position comprises two types: a text parameter is inserted into before another text parameter, the position of two text parameters is exchanged; After change was accomplished, the GNSS simulator carried out the correctness verification to the form of the text structure after changing, and will write in file/database through the text structure of verification;
Step 3: the text structure is used, and when the GNSS simulator starts simulation run, reads the text structural information in file/database; Obtain the text supplemental characteristic; And the text supplemental characteristic carried out the correctness verification, judge the validity of concrete supplemental characteristic value, if verification is incorrect; Provide error feedback information, suspend the operation of GNSS simulator; If verification is correct, then the GNSS simulator generates the navigation message bit stream constantly corresponding with emulation.
2. the configurable method of navigation message structure according to claim 1 is characterized in that described step 2 specifically comprises the steps:
Step 2.1: change text structure, confirm to receive the new reference position of changing the text parameter that influences, be divided into three kinds of situation: position insertion, place-exchange and length change;
(a) insert the position: before the current location of text parameter j, insert text parameter i, if text parameter i is existing text parameter, then the new reference position position_i_new of text parameter i is:
position_i_new＝position_j-length_i-m
i
Wherein, position_j representes the reference position of text parameter j, and length_i representes the bit length of text parameter i, m
iBe the multiple of packet checks code length, confirm according to the value of position_j-length_i: whether the value of judging position_j-length_i crosses over the block check code district, if not, and m
iGet 0, the new reference position of text parameter i remains on text parameter j place word; If, and cross over r
iIndividual block check code district, then m
iGet (r
i* packet checks code length), the new reference position of text parameter i is reduced to the r before the word of text parameter j place
iIndividual word;
The reference position of the whole text parameters between the former reference position of text parameter i to the new reference position changes, and establishes any text parameter that n representes to be changed to be influenced, and then the new reference position position_n_new of text parameter n is:
position_n_new＝position_n_org-length_i-m
ni
Wherein, position_n_org representes the former reference position of text parameter n, m
NiBe the multiple of packet checks code length, m
NiValue confirm according to the value of position_n_org-length_i: whether the value of judging position_n_org-length_i crosses over the block check code district, if not, m
NiGet 0, the new reference position of text parameter n remains on former place word; If, definite number r that crosses over the block check code district
Ni, m
NiGet (r
Ni* packet checks code length), the new reference position of text parameter n is reduced to the r before the word of former place
NiIndividual word;
If text parameter i is new parameter, then its new reference position is: position_i_new=position_j; And the reference position of the whole parameters after the new reference position of text parameter i changes, and establishes any text parameter that n representes to be changed to be influenced, and then the new reference position position_n_new of text parameter n is:
position_n_new＝position_n_org+length_i+m
2 ni
Wherein, m
2 NiBe the multiple of packet checks code length, m
2 NiValue confirm according to the value of position_n_org+length_i: whether the value of judging position_n_org+length_i crosses over the block check code district, if not, m
2 NiGet 0, the new reference position of parameter n remains on former place word; If, the number r in definite block check code district of crossing over
Ni, m
2 NiGet (r
Ni* packet checks code length), the new reference position of text parameter n spills into the r after the word of former place
NiIndividual word;
(b) text parameter i and j switch, behind the switch, reference position position_i_new and position_j_new that text parameter i and j are new are respectively:
position_i_new＝position?j_org+length_j-length_i±m
ij
position_j_new＝position_i_org
Wherein, original position text parameter formerly during i representes to exchange, during j representes to exchange original position after the text parameter, position_j_org representes the former reference position of text parameter j, length_j representes the bit length of parameter j, m
IjBe the multiple of packet checks code length, m
IjValue confirm according to the value of position_j_org+length_j-length_i: whether the value of judging position_j_org+length_j-length_i crosses over the block check code district, if not, m
IjGet 0, the new reference position of text parameter i remains on the former place of parameter j word; If, the number r in definite block check code district of crossing over
Ij, m
IjGet (r
Ij* packet checks code length), if length_j≤length_i gets-m
Ij, the new reference position of text parameter i tapers to the r before the word of the former place of text parameter j
IjIndividual word is if length_j＞length_i gets+m
Ij, the new reference position of text parameter i spills into the r after the word of the former place of text parameter j
IjIndividual word;
Corresponding change also takes place in the reference position of the whole text parameters between two exchange parameters, establishes any text parameter that n representes to be changed to be influenced, and then the new reference position position_n_new of text parameter n is:
position_n_new＝position_n_org+length_j-length_i±m
nij
Wherein, the multiple m of packet checks code length
NijValue confirm according to the value of position_n_org+length_j-length_i: whether the value of judging position_n_org+length_j-length_i crosses over the block check code district, if not, m
NijGet 0, the new reference position of text parameter n remains on former reference position place word; If confirm the block check code district number r that is crossed over
Nij, m
NijGet (r
Nij* packet checks code length), if length_j≤length_i gets-m
Nij, the new reference position of text parameter n tapers to the r before the word of former place
NijIndividual word is if length_j＞length_i gets+m
Ij, the new reference position of text parameter n spills into the r after the word of former place
NijIndividual word;
(c) change for length; The length of text parameter i is changed; The new reference position of each the text parameter after the text parameter i that then is modified changes, and establishes any text parameter that n representes to be changed to be influenced, and then the new reference position position_n_new of text parameter n is:
position_n_new＝position_n_org-length_i_org+length_i_new±m
in
Wherein, length_i_org representes the former bit length of text parameter i, and length_i_new representes the new bit length of text parameter i, the multiple m of packet checks code length
InValue confirm according to the value of position_n_org-length_i_org+length_i_new: whether the value of judging position_n_org-length_i_org+length_i_new crosses over the block check code district, if not, m
InGet 0, the new reference position of text parameter n keeps former place word; If confirm to cross over block check code district number r
In, m
InGet (r
In* check code length); If length_i_org>=length_i_new gets-m
In, then the new reference position of text parameter n tapers to former place word r before
InIndividual word; If length_i_org＜length_i_new gets+m
In, the new reference position of text parameter n spills into the r after the word of former place
InIndividual word;
Step 22: the text structure to revising after accomplishing is carried out the correctness verification, and shows check results; The correctness verification of described text structure is the total length whether the text structure after the judgement change keeps pre-configured defined text prime frame;
Step 2.3: will write in corresponding file/database through the text structural information of verification.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102868691A (en) * | 2012-09-13 | 2013-01-09 | 北京佰能电气技术有限公司 | Full-allocated data communication method and system |
| CN102929278A (en) * | 2012-09-12 | 2013-02-13 | 北京控制工程研究所 | Injecting data decoupling method achieved in manner of leading in invalid state |
| CN102970126A (en) * | 2012-11-06 | 2013-03-13 | 郑州威科姆科技股份有限公司 | Simple analogy method and device of static timing satellite signals |
| US20160109582A1 (en) * | 2012-06-05 | 2016-04-21 | Nextnav, Llc | Systems and methods for location positioning of user device |
| CN106405586A (en) * | 2016-10-18 | 2017-02-15 | 北京理工雷科电子信息技术有限公司 | Satellite navigation simulator and time-synchronization high-fidelity navigation signal reproducing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080117102A1 (en) * | 2006-10-27 | 2008-05-22 | Nokia Corporation | Providing and using messages including time related information |
| CN101334463A (en) * | 2008-07-29 | 2008-12-31 | 北京航空航天大学 | Time parameter analogue method in GNSS navigation signal simulator |
| US20100085249A1 (en) * | 2008-10-03 | 2010-04-08 | Trimble Navigation Limited | Compact Transmission of GPS Information Using Compressed Measurement Record Format |
-
2012
- 2012-04-12 CN CN 201210107417 patent/CN102629281B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080117102A1 (en) * | 2006-10-27 | 2008-05-22 | Nokia Corporation | Providing and using messages including time related information |
| CN101334463A (en) * | 2008-07-29 | 2008-12-31 | 北京航空航天大学 | Time parameter analogue method in GNSS navigation signal simulator |
| US20100085249A1 (en) * | 2008-10-03 | 2010-04-08 | Trimble Navigation Limited | Compact Transmission of GPS Information Using Compressed Measurement Record Format |
Non-Patent Citations (3)
| Title |
|---|
| 姜瑞健等: "导航信号模拟器上位机软件设计与实现", 《遥测遥控》 * |
| 张伯川等: "高动态GPS 卫星信号模拟器导航电文生成", 《北京航空航天大学学报》 * |
| 陈南: "卫星导航系统导航电文结构的性能评估", 《武汉大学学报信息科学版》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160109582A1 (en) * | 2012-06-05 | 2016-04-21 | Nextnav, Llc | Systems and methods for location positioning of user device |
| CN102929278A (en) * | 2012-09-12 | 2013-02-13 | 北京控制工程研究所 | Injecting data decoupling method achieved in manner of leading in invalid state |
| CN102929278B (en) * | 2012-09-12 | 2015-04-22 | 北京控制工程研究所 | Injecting data decoupling method achieved in manner of leading in invalid state |
| CN102868691A (en) * | 2012-09-13 | 2013-01-09 | 北京佰能电气技术有限公司 | Full-allocated data communication method and system |
| CN102868691B (en) * | 2012-09-13 | 2015-09-09 | 北京佰能电气技术有限公司 | A kind of full configurationization data communications method and system |
| CN102970126A (en) * | 2012-11-06 | 2013-03-13 | 郑州威科姆科技股份有限公司 | Simple analogy method and device of static timing satellite signals |
| CN106405586A (en) * | 2016-10-18 | 2017-02-15 | 北京理工雷科电子信息技术有限公司 | Satellite navigation simulator and time-synchronization high-fidelity navigation signal reproducing method |
| CN106405586B (en) * | 2016-10-18 | 2019-02-15 | 北京理工雷科电子信息技术有限公司 | The height of satellite navigation simulator and time synchronization navigation signal reproducing method true to nature |
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