CN105527633A - USB-based portable Beidou/GPS navigation time service device and method - Google Patents
USB-based portable Beidou/GPS navigation time service device and method Download PDFInfo
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- CN105527633A CN105527633A CN201610030008.1A CN201610030008A CN105527633A CN 105527633 A CN105527633 A CN 105527633A CN 201610030008 A CN201610030008 A CN 201610030008A CN 105527633 A CN105527633 A CN 105527633A
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- data
- big dipper
- time service
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
-
- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
- G04R20/04—Tuning or receiving; Circuits therefor
Abstract
The invention discloses a USB-based portable Beidou/GPS navigation time service device and method. The device comprises a Beidou/GPS receiving module, a USB protocol conversion module, a USB interface module and a portable computer. In the USB protocol conversion module, the data format of an RS232 protocol is converted into the data format meeting USB protocol transmission requirements, and the data is transmitted to the portable computer through a USB interface; and a special decoding window is utilized in the portable computer to enable navigation information of time and position and the like to be extracted out for displaying and providing for application layer exploitation. The device adopts the Beidou/GPS receiving module, so that the device is high in safety, small in size and portable; the USB interface is simple in structure; required external connection lines are few, and transmission speed is fast; and more accurate and stable development and application data is provided for the portable computer.
Description
Technical field
The invention belongs to real-time satellite navigation time service field of locating technology, be specifically related to a kind of USB transport protocol that adopts to the device and method of portable computer transmission precise time locating information.
Background technology
In today that is information-based and digital high-speed development, locate at military weapon, auto navigation and traffic administration, the aspects such as the network time synchronization such as electric power and communication, ensure that the precise method of engineering construction has obtained the accreditation of a lot of country with the Big Dipper/GPS dual-mode time service location, the navigation data of the Big Dipper/GPS needs the mode through decoding to extract the information of needs, these information are all the different code streams that satellite sends before decoding, received by antenna, be transferred in the chip of the Big Dipper/GPS, traditional decoding process is by adopting different microprocessors to implement decoding function in computing machine outside, the weak point of this decoding process is the increase in engineering cost, and whole system volume all can increase, reduce the convenience of this system.Find in the heuristic process of scientific and technical research, adopt usb protocol to transmit the Big Dipper/GPS dual-mode time service locating information to computing machine more applicable, convenient for portable computer.
The prior art the most close with the present invention is the article being entitled as " Big Dipper/GPS dual-mode time dissemination system of Based PC I-E designs " being published in the 1st phase 68-70 page in " Suzhou Institute of Science and Technology journal engineering version " by comrades such as the Suzhou Institute of Science and Technology poplar meeting tinkling of pieces of jade in March, 2014, its technical scheme is as shown in Figure 1: comprise the Big Dipper/GPS dual-mode time service module 1, B code decoder module 2, dual port RAM module 3, PCI-E bus hardware interface module 4 and host computer 5, when the Big Dipper/GPS dual-mode time service module 1 or timing code IRIG-B input B code decoder module 2, relevant information in code stream is extracted, host computer 5 is sent to for Fumction display again by PCI-E bus hardware interface module 4, and used within hardware.
The subject matter that this Big Dipper/gps satellite navigation information transmission system exists is: the scope of application is only confined to have the desk-top computer of PCI slot, in the face of the current information age, portable computer sharply increases, the system of this dependence PCI-E transmission mode can not be applied in portable computer, and use external hardware decoding, module volume is comparatively large, and portability is poor.
Summary of the invention
In order to overcome the defect of above-mentioned technology, the object of the invention is to the transmission requirement meeting the Big Dipper/gps satellite navigation information, for a kind of portable transmission mode based on usb protocol of portable computer design, and by computer application software, the satellite information that the Big Dipper/GPS dual-mode navigation chip receives is decoded and shown.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
It is a kind of that based on the USB portable Big Dipper/GPS navigation time service device, this device comprises the Big Dipper/GPS dual-mode time service module, USB interface modular converter and computer decoding module, wherein:
The described Big Dipper/GPS dual-mode time service module is configured for the electromagnetic wave the satellite navigation data converting thereof into NMEA agreement that receive satellite transmission;
Described USB interface modular converter connects the data output end of the Big Dipper/GPS dual-mode time service module, is configured for the data becoming to meet usb protocol by the satellite navigation data form of reading from RS232 protocol conversion;
Described computer decoding module connects USB interface modular converter by a serial ports receiver module, is configured for and decodes to the satellite navigation data transmitted with usb protocol and information entrained in code stream to be extracted.
Further, described USB interface modular converter is made up of RS232 protocol conversion module, usb protocol modular converter, usb interface module and external crystal-controlled oscillation module, wherein:
The input end of described RS232 protocol conversion module connects the data output end of the Big Dipper/GPS dual-mode time service module, for receiving with the satellite navigation data of RS232 protocol transmission, the input end of described usb protocol modular converter connects the output terminal of RS232 protocol conversion module, for being converted to the satellite navigation data of usb protocol transmission with the satellite navigation data of RS232 protocol transmission, the input end of described external crystal-controlled oscillation model calling usb protocol modular converter, for providing reference frequency, described usb interface module connects the output port of usb protocol modular converter, for the satellite navigation data transmitted with usb protocol is transferred to computer decoding module.
Further, the described Big Dipper/GPS dual-mode time service module adopts UM220 chip.
Further, described RS232 protocol conversion module adopts MAX232 chip.
Further, described usb protocol modular converter adopts PL2303.
A kind of based on the USB portable Big Dipper/GPS navigation time service method, satellite navigation data carries out serial ports and reads data initialization and to satellite navigation data decoding, comprise the following steps after being transferred to computer decoding module by serial ports receiver module with usb protocol:
Step 1) serial ports reads data initialization;
Step 1.1) SetCommport () function setup port, uses a function in class function storehouse to specify initial port to be COM1;
Step 1.2) SetlnputMode () function setup input mode, input data mode is binary form;
Step 1.3) SetSetting () function setup transformation parameter, baud rate is set to 9600bps;
Step 1.4) SetOutbuffersize () function setup output buffer, export spatial cache and be assigned as 512 bytes;
Step 1.5) Setlnput () function setup region of acceptance data length, be set to no parity check position, 8 data bit, 1 position of rest;
Step 1.6) Setlnbuffersize () function setup input block, input-buffer allocation of space is 1024 bytes;
Step 2) satellite navigation data decoding;
Step 2.1) receive data after data are carried out buffer memory, then the data that it is frame head that differentiation is selected with $ GPRMC, whether discriminant approach is resulting number framing head symbol is " $ ", if, then this array is entered the judgement of next step, if not, then give up this array, proceed this step and judge;
Step 2.2) with comma; " often kind of parameter in array is separated, the number passing through remembered comma does foundation, the change of comma number is the change of data type, when counting down to 1, and in the array of serial ports reception this moment, corresponding numerical value is not ASCLL code 0x24, can determine that time numerical value is placed in inside array, extract;
Step 2.3) variable of a definition CString type, carry out the numerical value of storage time with this variable, time numerical value extracts rear logarithm value and is separated, and by the hour, the order of minute, second extracts and buffer memory array successively;
Step 2.4) the obtained time is done time zone conversion, the time of the Greenwich zone passed on the Big Dipper/GPS dual-mode time service module inside becomes Beijing time, and the time obtained after being about to decoding adds 8 hours to obtain Beijing time accurately.
The invention has the beneficial effects as follows:
The present invention utilizes the portability of USB interface and UM220 chip, for portable computer provides reliable satellite navigation data, provides time and the positional information of reasonable accuracy to the exploitation of the application layer of portable computer.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of " Big Dipper/GPS dual-mode time dissemination system of Based PC I-E " in prior art;
Fig. 2 is hardware block diagram of the present invention;
Fig. 3 is USB interface modular converter structural schematic block diagram in Fig. 2;
Fig. 4 is that serial ports of computers receiver module reads data initialization process flow diagram;
Fig. 5 is that computer decoding module is to satellite navigation data decoding process figure.
Number in the figure illustrates: 1, the 6. Big Dipper/GPS dual-mode time service module, 2.B code decoder module, 3. dual port RAM module, 4.PCI-E bus hardware interface module, 5. host computer, 7.USB interface modular converter, 8. serial ports receiver module, 9. computer interface display module, 10.RS232 protocol conversion module, 11.USB protocol conversion module, 12.GPRMC locating information, 13.USB interface module, 14. computer decoding modules.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
With reference to shown in Fig. 2, a kind of based on the USB portable Big Dipper/GPS navigation time service device, this device comprises the Big Dipper/GPS dual-mode time service module 6, USB interface modular converter 7 and computer decoding module 14, wherein:
The described Big Dipper/GPS dual-mode time service module 6 is configured for the electromagnetic wave the satellite navigation data converting thereof into NMEA agreement that receive satellite transmission;
Described USB interface modular converter 7 connects the data output end of the Big Dipper/GPS dual-mode time service module 6, is configured for the data becoming to meet usb protocol by the satellite navigation data form of reading from RS232 protocol conversion;
Described computer decoding module 14 connects USB interface modular converter 7 by a serial ports receiver module 8, is configured for and decodes to the satellite navigation data transmitted with usb protocol and information entrained in code stream to be extracted;
In the present embodiment, the output terminal of computer decoding module 14 is connected with computer interface display module 9, for showing the data decoded.
With reference to shown in Fig. 3, described USB interface modular converter 7 is made up of RS232 protocol conversion module 10, usb protocol modular converter 11, usb interface module 12 and external crystal-controlled oscillation module 13, wherein:
The input end of described RS232 protocol conversion module 10 connects the data output end of the Big Dipper/GPS dual-mode time service module 6, for receiving with the satellite navigation data of RS232 protocol transmission, the input end of described usb protocol modular converter 11 connects the output terminal of RS232 protocol conversion module 10, for being converted to the satellite navigation data of usb protocol transmission with the satellite navigation data of RS232 protocol transmission, described external crystal-controlled oscillation module 13 connects the input end of usb protocol modular converter 11, for providing reference frequency, described usb interface module 12 connects the output port of usb protocol modular converter 11, for the satellite navigation data transmitted with usb protocol is transferred to computer decoding module 14.
The described Big Dipper/GPS dual-mode time service module 6 adopts UM220 chip.
Described RS232 protocol conversion module 10 adopts MAX232 chip.
Described usb protocol modular converter 11 adopts PL2303.
With reference to shown in Fig. 4 and Fig. 5, a kind of based on the USB portable Big Dipper/GPS navigation time service method, satellite navigation data carries out serial ports and reads data initialization and to satellite navigation data decoding, comprise the following steps after being transferred to computer decoding module by serial ports receiver module with usb protocol:
Step 1) serial ports reads data initialization;
Step 1.1) SetCommport () function setup port, uses a function in class function storehouse to specify initial port to be COM1;
Step 1.2) SetlnputMode () function setup input mode, input data mode is binary form;
Step 1.3) SetSetting () function setup transformation parameter, baud rate is set to 9600bps;
Step 1.4) SetOutbuffersize () function setup output buffer, export spatial cache and be assigned as 512 bytes;
Step 1.5) Setlnput () function setup region of acceptance data length, be set to no parity check position, 8 data bit, 1 position of rest;
Step 1.6) Setlnbuffersize () function setup input block, input-buffer allocation of space is 1024 bytes;
Step 2) satellite navigation data decoding;
Step 2.1) receive data after data are carried out buffer memory, then the data that it is frame head that differentiation is selected with $ GPRMC, whether discriminant approach is resulting number framing head symbol is " $ ", if, then this array is entered the judgement of next step, if not, then give up this array, proceed this step and judge;
Step 2.2) with comma; " often kind of parameter in array is separated, the number passing through remembered comma does foundation, the change of comma number is the change of data type, when counting down to 1, and in the array of serial ports reception this moment, corresponding numerical value is not ASCLL code 0x24, can determine that time numerical value is placed in inside array, extract;
Step 2.3) variable of a definition CString type, carry out the numerical value of storage time with this variable, time numerical value extracts rear logarithm value and is separated, and by the hour, the order of minute, second extracts and buffer memory array successively;
Step 2.4) the obtained time is done time zone conversion, the time of the Greenwich zone passed on the Big Dipper/GPS dual-mode time service module inside becomes Beijing time, and the time obtained after being about to decoding adds 8 hours to obtain Beijing time accurately.
The principle of the invention
Outside dual-mode antenna and satellite bimodulus navigate time service chip UM220(and the Big Dipper/GPS dual-mode time service module 6) be connected, the receiving end of the Big Dipper/GPS dual-mode time service module 6 receives the electromagnetic wave of satellite transmission by antenna, convert electric signal to by wire transmission on module port, after treatment, can read from the COM port or COM device or COM1 of UM220 chip the satellite navigation data meeting NMEA agreement; Data layout is needed to change after reading data, data on minimum system plate just meet the data stream of RS232 agreement, usb protocol modular converter 11 is needed to carry out protocol conversion, on UM220 system board by bit stream on RS232 protocol conversion module 10, again the output port of RS232 protocol conversion module 10 is connected on usb protocol modular converter 11, after data protocol conversion, connect a usb interface module 12 by the output port of usb protocol modular converter 11.With usb interface module 12 satellite navigation information is transferred in computing machine and processes.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. based on the USB portable Big Dipper/GPS navigation time service device, it is characterized in that, this device comprises the Big Dipper/GPS dual-mode time service module (6), USB interface modular converter (7) and computer decoding module (14), wherein:
The described Big Dipper/GPS dual-mode time service module (6) is configured for the electromagnetic wave the satellite navigation data converting thereof into NMEA agreement that receive satellite transmission;
Described USB interface modular converter (7) connects the data output end of the Big Dipper/GPS dual-mode time service module (6), is configured for the data becoming to meet usb protocol by the satellite navigation data form of reading from RS232 protocol conversion;
Described computer decoding module (14) connects USB interface modular converter (7) by a serial ports receiver module (8), is configured for and decodes to the satellite navigation data transmitted with usb protocol and information entrained in code stream to be extracted.
2. according to claim 1 based on the USB portable Big Dipper/GPS navigation time service device, it is characterized in that, described USB interface modular converter (7) is made up of RS232 protocol conversion module (10), usb protocol modular converter (11), usb interface module (12) and external crystal-controlled oscillation module (13), wherein:
The input end of described RS232 protocol conversion module (10) connects the data output end of the Big Dipper/GPS dual-mode time service module (6), for receiving with the satellite navigation data of RS232 protocol transmission, the input end of described usb protocol modular converter (11) connects the output terminal of RS232 protocol conversion module (10), for being converted to the satellite navigation data of usb protocol transmission with the satellite navigation data of RS232 protocol transmission, described external crystal-controlled oscillation module (13) connects the input end of usb protocol modular converter (11), for providing reference frequency, described usb interface module (12) connects the output port of usb protocol modular converter (11), for the satellite navigation data transmitted with usb protocol is transferred to computer decoding module (14).
3. according to claim 1ly it is characterized in that based on the USB portable Big Dipper/GPS navigation time service device, the described Big Dipper/GPS dual-mode time service module (6) adopts UM220 chip.
4. according to claim 2ly it is characterized in that based on the USB portable Big Dipper/GPS navigation time service device, described RS232 protocol conversion module (10) adopts MAX232 chip.
5. according to claim 2ly it is characterized in that based on the USB portable Big Dipper/GPS navigation time service device, described usb protocol modular converter (11) adopts PL2303.
6. one kind based on the USB portable Big Dipper/GPS navigation time service method, it is characterized in that, satellite navigation data carries out serial ports and reads data initialization and to satellite navigation data decoding, comprise the following steps after being transferred to computer decoding module by serial ports receiver module with usb protocol:
Step 1) serial ports reads data initialization;
Step 1.1) SetCommport () function setup port, uses a function in class function storehouse to specify initial port to be COM1;
Step 1.2) SetlnputMode () function setup input mode, input data mode is binary form;
Step 1.3) SetSetting () function setup transformation parameter, baud rate is set to 9600bps;
Step 1.4) SetOutbuffersize () function setup output buffer, export spatial cache and be assigned as 512 bytes;
Step 1.5) Setlnput () function setup region of acceptance data length, be set to no parity check position, 8 data bit, 1 position of rest;
Step 1.6) Setlnbuffersize () function setup input block, input-buffer allocation of space is 1024 bytes;
Step 2) satellite navigation data decoding;
Step 2.1) receive data after data are carried out buffer memory, then the data that it is frame head that differentiation is selected with $ GPRMC, whether discriminant approach is resulting number framing head symbol is " $ ", if, then this array is entered the judgement of next step, if not, then give up this array, proceed this step and judge;
Step 2.2) with comma; " often kind of parameter in array is separated, the number passing through remembered comma does foundation, the change of comma number is the change of data type, when counting down to 1, and in the array of serial ports reception this moment, corresponding numerical value is not ASCLL code 0x24, can determine that time numerical value is placed in inside array, extract;
Step 2.3) variable of a definition CString type, carry out the numerical value of storage time with this variable, time numerical value extracts rear logarithm value and is separated, and by the hour, the order of minute, second extracts and buffer memory array successively;
Step 2.4) the obtained time is done time zone conversion, the time of the Greenwich zone passed on the Big Dipper/GPS dual-mode time service module inside becomes Beijing time, and the time obtained after being about to decoding adds 8 hours to obtain Beijing time accurately.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610030008.1A CN105527633B (en) | 2016-01-18 | 2016-01-18 | One kind is based on the portable Big Dippeves of USB/GPS navigation time service device and method |
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| CN201610030008.1A CN105527633B (en) | 2016-01-18 | 2016-01-18 | One kind is based on the portable Big Dippeves of USB/GPS navigation time service device and method |
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| CN108375898A (en) * | 2018-03-15 | 2018-08-07 | 福建师范大学 | A kind of computer high-precision time service control method |
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| CN105527633B (en) | 2018-02-02 |
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