CN104597456A - Multi-board-card synchronous control method of GNSS signal simulation system - Google Patents
Multi-board-card synchronous control method of GNSS signal simulation system Download PDFInfo
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- CN104597456A CN104597456A CN201510088899.1A CN201510088899A CN104597456A CN 104597456 A CN104597456 A CN 104597456A CN 201510088899 A CN201510088899 A CN 201510088899A CN 104597456 A CN104597456 A CN 104597456A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B17/00—Systems involving the use of models or simulators of said systems
- G05B17/02—Systems involving the use of models or simulators of said systems electric
Abstract
The invention discloses a multi-board-card synchronous control method of a GNSS signal simulation system. The method includes: digital simulation software time synchronization setting, drive software data synchronization control and multi-board-card cooperative work control. The method has the advantages that multi-constellation and multi-frequency point navigation signals are generated in a synergy manner, and time synchronization of the navigation signals of each frequency point of the GNSS signal simulation system formed by multiple digital simulation computers, multiple frequency points and multiple boards and cards is guaranteed; the structure of the GNSS signal simulation system can be updated from a simple digital simulation computer, single frequency point and single board and card structure to the multiple digital simulation computers, multiple frequency points and multiple boards and cards structure, the GNSS signal simulation system is allowed to have a function for generating compatible multi-system multi-frequency-point navigation signals, and the method is significant to GNSS system compatibility performance evaluation and testing and receiver interoperability performance testing.
Description
Technical field
The present invention relates to a kind of new many constellations, method that multifrequency point navigation signal works in coordination with generation, more particularly, be a kind ofly imitate computing machine by majority, GNSS signal analogue system that multifrequency point, many boards are formed works in coordination with the method producing many constellations, multifrequency point navigation signal.
Background technology
GNSS is the abbreviation of Global Navigation Satellite System, and Chinese is GLONASS (Global Navigation Satellite System).
In order to and interoperability compatible to many constellations GNSS carry out accurate simulation, checking and assessment, need synchronous generation many constellations, multiband navigation signal.And for the GNSS signal analogue system of being imitated computing machine by majority, multifrequency point, many board structures form, in order to make many constellations, multifrequency point navigation signal works in coordination with generation needs to solve following two problems:
1. intermediate frequency drives the control signal the packet synchronisation how each number received being imitated the different frequent points synchronization that computing machine produces to be transferred to each intermediate frequency board.
2. each intermediate frequency board and the problem driving clock reference synchronization second.
It is exactly the problem synchronously produced to solve multisystem GNSS signal that many constellations, multifrequency point navigation signal work in coordination with generation technology.Chase each number that synchronous method coordinates to receive by utilizing packet differential and imitate the control signal packet that computing machine transmission comes, make it reach synchronous.In addition, utilize the feedback interactive information of each board and driving, clock reference second of each board is calibrated, make clock reference synchronization second of each intermediate frequency board and driving.The generation of this technology is mainly in order to solve many GNSS signal analogue system many boards synchro control problem.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of many boards synchronisation control means of GNSS signal analogue system, namely many constellations, multifrequency point navigation signal work in coordination with the method for generation, ensure that imitate computing machine by majority, the time synchronized of the navigation signal of each frequency that GNSS signal analogue system that multifrequency point, many boards are formed produces.
In order to reach foregoing invention object, the technical solution used in the present invention is:
Many boards synchronisation control means of GNSS signal analogue system, this control method comprises provides the setting of digital simulation software time synchronized, drive software data syn-chronization controls, the collaborative work of many boards controls three modules;
First the module emulation initial time identical to each frequency point setting of each system is set by digital simulation software time synchronized, and the packet with identical frame number is packaged into the control signal that each frequency phase emulates generation in the same time;
Wherein, due to the difference of computing power, frequency number and the initial operand of different system, different numbers can be caused to imitate computing machine and non-concurrent starts computing.The frame count of the packet of this different system that NI cabinet driver is received in same second is different.
Drive software data syn-chronization control module realizes the synchronous of the packet of each frequency, and within a second, realize drive software produces board effective transmission to each intermediate-freuqncy signal;
Wherein, if board with drive one second clock reference asynchronous, namely and synchronously unrealized although all boards can be caused in one second all to have received packet, the frame count of packet is not identical.
The second clock reference of many boards collaborative work control module to each board is calibrated, and makes clock reference synchronization second of each intermediate frequency board and driving.
Concrete preferred, described drive software data syn-chronization control module utilizes packet differential to chase synchronous method and realizes the synchronous of the packet of each frequency in the nonsynchronous situation of the packet received.
More specifically, described many boards collaborative work control module utilizes and drives the method second clock reference to each board mutual with each intermediate frequency board feedback information to calibrate, and realizes clock reference synchronization second of each intermediate frequency board and driving.
Compared with prior art, advantage of the present invention is: provide a kind of many constellations, method that multifrequency point navigation signal works in coordination with generation, GNSS signal Simulation System Platform structure can be imitated computing machine by odd number by the method, single-frequency point, veneer card structure upgrade to most imitative computing machine, multifrequency point, many board structures, make it have the function of the multisystem multifrequency point navigation signal producing clock synchronous, test significant to the compatible Performance Evaluation test of GNSS system and the test of receiver Interoperability.
Accompanying drawing explanation
Fig. 1 is GNSS signal simulation system data bag transmission control flow chart.
Fig. 2 is a second schematic diagram for clock identification.
Fig. 3 packet differential chases the schematic diagram of synchronous method.
The asynchronous schematic diagram of packet that Fig. 4 different time benchmark causes.
Embodiment
With specific embodiment, technical scheme of the present invention is described in further detail below.
See Fig. 1, synchronisation control means of the present invention comprises provides the setting of digital simulation software time synchronized, drive software data syn-chronization controls, the collaborative work of many boards controls three modules.
A. digital simulation software time synchronized arranges the function that module completes and is: carry out synchronous emulation to multiple frequencies of user-selected multiple systems, and to emulation produce one second control signal carry out packing and number, be finally transferred to the driving of intermediate frequency downwards.
B. the function that drive software data syn-chronization control module completes is: due to the difference of computing power, frequency number and the initial operand of different system, causes different numbers to imitate computing machine and non-concurrent starts computing.This can cause NI cabinet driver in same second, receive the data packet frame counting difference of different system.Drive software data syn-chronization design module is exactly in the nonsynchronous situation of the packet received, utilize packet differential to chase synchronous method and realize the synchronous of the packet of each frequency, and within a second, realize drive software produces board effective transmission to each intermediate-freuqncy signal.It is as follows that packet differential chases synchronous concrete methods of realizing, packet realizes synchronously: fall behind frequency and delete a packet, the packet of all the other frequencies is not deleted (when frame count difference is normal, suppressing exception packet), realize synchronously: carry out data transmission (deleting a packet).Packet differential chases the schematic diagram of synchronous method, as shown in Figure 3.
C. the function that many boards collaborative work control module completes is: if board and driving one second clock reference is asynchronous, although all boards can be caused in one second all to have received packet, but the frame count of packet is not identical, namely and synchronously unrealized, as shown in Figure 4.Many boards collaborative work control module utilizes the feedback interactive information of each board and driving, calibrates clock reference second of each board, makes clock reference synchronization second of each intermediate frequency board and driving.Concrete implementation method is as follows: because each board is all in same time coordinate system, can compare so read their respective temporal informations.In the process that intermediate-freuqncy signal produces, the minimum interval that control word upgrades is 20ms.20ms obtains by carrying out frequency division to 90MHz clock.So the 20ms count value directly used in intermediate frequency board is considered in design, realize drive software synchronous with the second of intermediate frequency board.Namely the temporal information (20ms count value) using many boards to feed back obtains time reference, these feedback informations are judged: if certain 20ms count ratio last time of reading is little, just illustrate that the time of board has entered next second, need to carry out a packet synchronisation operation, otherwise illustrate that clock reference second of board is synchronous.The schematic diagram of clock identification second of different board, as shown in Figure 2.
As from the foregoing, the invention provides a kind of many constellations, method that multifrequency point navigation signal works in coordination with generation, GNSS signal Simulation System Platform structure can be imitated computing machine by odd number by the method, single-frequency point, veneer card structure upgrade to most imitative computing machine, multifrequency point, many board structures, make it have the function of the multisystem multifrequency point navigation signal producing clock synchronous, test significant to the compatible Performance Evaluation test of GNSS system and the test of receiver Interoperability
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvement or replacement, these improve or replace and also should be considered as protection scope of the present invention.
Claims (3)
1. many boards synchronisation control means of GNSS signal analogue system, is characterized in that, this control method comprises the setting of digital simulation software time synchronized, drive software data syn-chronization controls, the collaborative work of many boards controls three modules;
First the module emulation initial time identical to each frequency point setting of each system is set by digital simulation software time synchronized, and the packet with identical frame number is packaged into the control signal that each frequency phase emulates generation in the same time;
Drive software data syn-chronization control module realizes the synchronous of the packet of each frequency, and within a second, realize drive software produces board effective transmission to each intermediate-freuqncy signal;
The second clock reference of many boards collaborative work control module to each board is calibrated, and makes clock reference synchronization second of each intermediate frequency board and driving.
2. many boards synchronisation control means of a kind of GNSS signal analogue system according to claim 1, it is characterized in that, described drive software data syn-chronization control module utilizes packet differential to chase synchronous method and realizes the synchronous of the packet of each frequency in the nonsynchronous situation of the packet received.
3. many boards synchronisation control means of a kind of GNSS signal analogue system according to claim 1 and 2, it is characterized in that, described many boards collaborative work control module utilizes and drives the method second clock reference to each board mutual with each intermediate frequency board feedback information to calibrate, and realizes clock reference synchronization second of each intermediate frequency board and driving.
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Cited By (3)
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| CN110793548A (en) * | 2019-11-06 | 2020-02-14 | 上海交通大学 | Navigation simulation test system based on virtual-real combination of GNSS receiver hardware in loop |
| CN111083019A (en) * | 2019-12-31 | 2020-04-28 | 卡斯柯信号有限公司 | Two-out-of-two hardware platform function test system and method based on network communication |
| CN113722880A (en) * | 2021-07-21 | 2021-11-30 | 北京空间飞行器总体设计部 | Multi-satellite parallel simulation time synchronization control system and method |
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| CN110793548A (en) * | 2019-11-06 | 2020-02-14 | 上海交通大学 | Navigation simulation test system based on virtual-real combination of GNSS receiver hardware in loop |
| CN110793548B (en) * | 2019-11-06 | 2023-04-18 | 上海交通大学 | Navigation simulation test system based on virtual-real combination of GNSS receiver hardware in loop |
| CN111083019A (en) * | 2019-12-31 | 2020-04-28 | 卡斯柯信号有限公司 | Two-out-of-two hardware platform function test system and method based on network communication |
| CN113722880A (en) * | 2021-07-21 | 2021-11-30 | 北京空间飞行器总体设计部 | Multi-satellite parallel simulation time synchronization control system and method |
| CN113722880B (en) * | 2021-07-21 | 2023-12-12 | 北京空间飞行器总体设计部 | Multi-star parallel simulation time synchronous control system and method |
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