CN203720359U - Multi-mode multi-band continuous operational reference system (CORS) datum reference station based on advanced RISC machines 9 (ARM9) - Google Patents

Abstract

The utility model discloses a multi-mode multi-band continuous operational reference system (CORS) datum reference station based on advanced RISC machines 9 (ARM9). The CORS datum reference station comprises an ARM9 control module and other functional modules, a global navigation satellite system (GNSS) antenna captures satellite electromagnetic wave signals and provides mimic input signals for a power splitter module, and the power splitter module inputs the GNSS signals to a Beidou navigation system module and a GPS/GLONASS module. A synchronous dynamic random access memory (SDRAM) module is a memory space for system booting and program execution, a memory module is used for storing a file system and saving primary observation data of satellites, a clock module provides a clock signal for the ARM9 control module, and the ARM9 control module processes GNSS data and sends the GNSS data to a CORS data center server through an ethernet communication module. The multi-mode multi-bandCORS datum reference station can track real-time satellite data information of eight frequency points of three systems, i.e., Beidou-B1/B2, GPS-L1/L2/L5, and GLONASS-L1/L2, has an independent management mode and a network-based management mode, and can provide a stable and reliable data source for a CORS data center.

Description

A kind of multimode multi-frequency CORS reference station based on ARM9

Technical field

The utility model relates to multimode multi-frequency CORS (Continuous Operational Reference System, operation satnav service colligate system continuously) high precision position service technology field, relate in particular to a kind of multimode multi-frequency CORS reference station based on ARM9 (Advanced RISC Machines, senior reduced instruction set computer machine).

Background technology

Accurately measuring in application, precision to elements of a fix data, accuracy, ageingly there is a higher requirement.And rely on merely remote sensing image to be difficult to meet the current demand that high precision is obtained, upgraded fast.Use CORS system can make up the problem that remote sensing image exists, can make the real-time accuracy of measuring be greatly improved.

Operation satellite positioning navigation service system (CORS) is the infrastructure of information society, era of knowledge-driven economy indispensability continuously.It can be for city planning, land resources, mapping, traffic, meteorology, field and the industry such as prevent and reduce natural disasters.The service level of CORS system is representing a national up-to-dateness in certain aspect, dipper system networking build up covering the whole world after, the demand of CORS system and application level will have unprecedented fast development.

CORS system is mainly by reference station, data processing centre (DPC), the three parts compositions such as end-user system.In CORS coverage, form reference station net by equally distributed base station roughly, CORS reference station is responsible for satellite-signal and is followed the tracks of and gather, and the data of collection are sent to data processing centre (DPC) by network.The data source that provides of reference station is provided, and CORS system can provide that precision is high for terminal user, good reliability, real-time locating navigation information.Traditional C ORS reference station normally adopts receiver to add the pattern of PC, be usually located at field, be exposed under open-air atmosphere, receiver can bear the severe weather conditions such as wind and weather after adopting three anti-(waterproof and dustproof, shockproof) design, and computing machine cannot bear.Therefore need for adding a cover a monitoring room, be placed on indoorly, the cost that makes to build a station under this pattern is higher.Along with microelectric technique development, someone proposes PC service software to carry out embedded system transformation, integrates mutually with receiver, forms and has satellite-signal tracking, network service in the platform of one.Along with the networking of Beidou satellite navigation system is built up, the demand at the CORS reference station of compatible multimode multi-frequency is day by day strong simultaneously.

In order to meet above-mentioned requirements, realize integrated reference station, had people's utility model double-frequency GPS receiver and CORS system (application number: 200910040404.2), this utility model is mainly to use GPS two-frequency signal, carry out rover station location Calculation, inapplicable reference station.Application number is that the GPS receiver of 200820110333.X needs additional computing machine and can only receive gps satellite navigation signal.Application number is 201110055566.0 big-dipper satellite and gps satellite bimodulus location time service type receiver, and the compatible Big Dipper of this utility model and GPS dual mode system, provide time service function, and the location information service of high precision three system eight frequencies is not provided.Application number is a kind of navigation neceiver that 201120575722.1 GPS receiver and application number are 201010220178.9, lacks the data message of GLONANSS and the Big Dipper, does not have Ethernet transport communication function simultaneously.

Existing reference station can meet the measurement of single mode double frequency and calculate needs, but along with available satellite increases, the demand that uses multimode multi-frequency to resolve is day by day strong.Existing reference stand in process satellite information and the long-range connection control processing power of multimode multi-frequency can not practical requirement.

Utility model content

In order to overcome the deficiencies in the prior art, the utility model provides a kind of multimode multi-frequency CORS reference station based on ARM9, can follow the tracks of the Big Dipper-B1/B2/B3, GPS-L1/L2/L5, GLONASS-L1/L2 tri-system eight frequency satellite datas simultaneously, and adopt Ethernet, use Ntrip agreement and ICP/IP protocol to CORS data center, stand in the processing satellite information of multimode multi-frequency and the actual demand of long-range connection control processing power to meet existing reference the satellite data communication gathering.

For achieving the above object, the utility model is taked following technical scheme:

A multimode multi-frequency CORS reference station based on ARM9, comprises DC power supplier, merit sub-module, Big Dipper module, GPS/GLONASS module, SDRAM module, ARM9 control module, ethernet communication module, clock module, memory module, reseting module and GNSS antenna;

Merit sub-module is divided into two-way for the Satellite Simulation signal merit that GNSS antenna is provided, and offers respectively Big Dipper module and GPS/GLONASS module;

Big Dipper module is carried out modulation /demodulation and format change for the Satellite Simulation signal that merit sub-module is inputted, and provides big-dipper satellite original observed data to ARM9 control module;

GPS/GLOANSS module is carried out modulation /demodulation and format change for the Satellite Simulation signal that merit sub-module is inputted, and provides GPS and GLONASS satellite original observed data to ARM9 control module;

ARM9 control module is for the treatment of the satellite original observed data from Big Dipper module and the input of GPS/GLOANSS module, reading command and data from SDRAM module, be transferred to CORS data center server by ethernet communication module satellite original observed data after treatment; And the work clock that uses clock module to provide, read u-boot, kernel and the file system of memory module, satellite original observed data is stored in to memory module simultaneously;

Reseting module is for providing electrifying startup reset signal to ARM9 control module;

DC power supplier is for providing working power to Big Dipper module, GPS/GLONASS module, SDRAM module, ARM9 control module, ethernet communication module, clock module, reseting module and memory module.

Clock module is for generation of the required clock signal of the each module of system.Be that microprocessor, storer or the normal work of various peripherals all need clock signal to guide, and distinct device is due to characteristic difference separately, the frequency of required clock signal is also not quite similar.So the clock module described in the technical program is by generation and manage all kinds of clock signals.

Further, ARM9 control module adopts the S3C2440 chip taking ARM9 as kernel, uses the SoC(System on Chip taking ARM9 as kernel) chip, and transplant (SuSE) Linux OS thereon.Process the GNSS data of Big Dipper module and the transmission of GPS/GLONASS module by RS232 serial ports.After the pre-service of GNSS data, use NTRIP or TCP/IP host-host protocol, and by VPN private network, GNSS data are sent to CORS data center server, and adopt rolling script that data are stored on local storage.

Further, SDRAM module adopts the HY57V561620 chip composition of two 32M*16Bit, the mode that two chip blocks adopt and connect; Described S3C2440 chip is connected with SDRAM module by SDRAM control interface, and described SDRAM module provides system running memory space for ARM9 control module.Adopt high performance SDRAM memory chip to use as internal memory based on ARM9 embedded system, guarantee program at a high speed, stable loading and correctly carrying out, there is transfer efficiency high, reliability is strong, hardware connects the features such as simple.

Further, memory module adopts K9K8G08 chip, and described S3C2440 chip is connected with memory module K9K8G08 chip by NAND FLASH control unit interface.Adopt NAND Flash memory chip, for the storage of the bootloader based on ARM9 embedded system, kernel, file system and application program, simultaneously for storing a large amount of real-time satellite signal datas.NAND Flash belongs to nonvolatile memory, storage related data that can be long-time, stable, and the correct and reliable start operation of the system that both ensured, can make again the satellite data of storage repeat and effectively utilization.Reseting module adopts MAX811 reset chip, and described MAX811 reset chip is connected with the reset terminal of S3C2440 chip.

Further, ethernet communication module adopts DM9000EP network card chip, and described S3C2440 chip is connected with network card chip DM9000EP by Ethernet control interface.Adopt ethernet mac controller, for satellite data after treatment is transferred to CORS data center server.Guarantee has automatic synchronization function and can automatically complete and be configured to be applicable to greatest extent its line bandwidth, realizes stable, the fast transport that the in the situation that of low-power consumption, complete satellite data.

Further, S3C2440 chip carries out data communication by RS232 serial ports and Big Dipper module and GPS/GLONASS module, select the board of the Big Dipper three frequencies that compass in ancient China company model is K505 as Big Dipper module, the board that selection NovAtel company model is OEMV-2 is as GPS/GLOANSS module.

Further, DC power supplier is used universal power adapter to provide the input power of 12V/1A for this reference station, described 12V/1A input power is converted to 3.3V/1A and two kinds of power supplys of 5V/1A by DC-DC change-over circuit, described 5V/1A power supply provides working power to ARM9 control module, clock module, reset circuit, and described 3.3V power supply provides working power to SDRAM module, memory module, ethernet communication module, Big Dipper module and GPS/GLONASS module.DC-DC change-over circuit adopts voltage transitions chip TPS54295.

Further, between ARM9 control module and CORS data center server, adopt NTRIP communication protocol or ICP/IP protocol to carry out data transmission.

Further, merit sub-module be GNSS antenna collect GNSS simulating signal be loaded into Big Dipper module and GPS/GLONASS module simultaneously, for two modules provide demodulation need signal.Merit sub-module comprises SP2G chip and 0 Ohmage; The Satellite Simulation signal that described GNSS antenna provides is divided into two paths of signals by SP2G chip merit, after then disturbing by 0 Ohmage clutter reduction respectively, is loaded into Big Dipper module and GPS/GLONASS module.

Beneficial effect: the integrated multimode multi-frequency satnav in reference station, network service, the data that (1) the utility model provides are stored in all over the body, are the novel reference stations of software and hardware integration.(2) the utility model uses unique GNSS signal merit to divide and realizes multimode multi-frequency (three system eight frequencies) satnav tracking, network service, data storing in one on hardware view; On software view, realize on ARM9 processor and transplanted (SuSE) Linux OS, realized remote monitoring, upgrading.(3) the utility model application integrity monitoring algorithm, monitors satellite data, can find fault alarm, and reject, and has realized the intellectuality at CORS reference station.(4) the utility model ARM9 control module selects the SoC chip S3C2440 of Samsung as core processor, additional power supply circuit, starts reset circuit, and clock circuit and control leg signal form the minimum system with S3C2440, succinct efficient, save energy consumption.(5) the SDRAM module that the utility model provides adopts high performance SDRAM memory chip to use as the internal memory based on ARM9 embedded system, guarantee program at a high speed, stable loading and correctly carrying out, have transfer efficiency high, reliability is strong, and hardware connects the features such as simple.(6) memory module that the utility model provides adopts NAND Flash memory chip, for the storage of the bootloader based on ARM9 embedded system, kernel, file system and application program, simultaneously for storing a large amount of real-time satellite signal datas.NAND Flash belongs to nonvolatile memory, storage related data that can be long-time, stable, and the correct and reliable start operation of the system that both ensured, can make again the satellite data of storage repeat and effectively utilization.(7) the ethernet communication module that the utility model provides adopts ethernet mac controller, for satellite data after treatment is transferred to CORS data center server.Guarantee has automatic synchronization function and can automatically complete and be configured to be applicable to greatest extent its line bandwidth, realizes stable, the fast transport that the in the situation that of low-power consumption, complete satellite data.

Brief description of the drawings

The hardware structure diagram at the multimode multi-frequency CORS reference station based on ARM9 that Fig. 1 provides for the utility model;

The software architecture diagram at the multimode multi-frequency CORS reference station based on ARM9 that Fig. 2 provides for the utility model;

Fig. 3 is memory module configuration figure in Fig. 1;

Fig. 4 is SDRAM modular structure figure in Fig. 1;

Fig. 5 is merit sub-module structural drawing in Fig. 1;

Fig. 6 is the utility model power managed schematic diagram;

Fig. 7 is direct current power module structure figure in Fig. 1;

Fig. 8 is ethernet communication modular structure figure in Fig. 1;

Fig. 9 is clock module circuit diagram in Fig. 1;

Figure 10 is the circuit diagram of reseting module in Fig. 1;

Embodiment

Below in conjunction with Figure of description, the utility model is further described.

As shown in Figure of description Fig. 1, a kind of multimode multi-frequency CORS reference station based on ARM9 that the utility model provides, comprises DC power supplier, merit sub-module, Big Dipper module, GPS/GLONASS module, SDRAM module, ARM9 control module, ethernet communication module, clock module, reseting module, memory module and GNSS antenna.

The satellite-signal merit that merit sub-module provides GNSS antenna is divided into two-way, offers respectively Big Dipper module and GPS/GLONASS module; Big Dipper module is the Satellite Simulation signal of merit sub-module input, through exporting the information such as observed reading, ephemeris of Beidou satellite navigation system after modulation /demodulation and format change, for ARM9 control module provides big-dipper satellite raw data; GPS/GLOANSS module realizes the Satellite Simulation signal of merit sub-module input, through exporting the information such as observed reading, ephemeris of GPS and GLONASS satellite navigation system after modulation /demodulation and format change, for ARM9 control module provides GPS and GLONASS satellite raw data; ARM9 control module is processed from the original moonscope value of Big Dipper module, the input of GPS/GLOANSS module, reading command and data from SDRAM module, by ethernet communication module, data transmission is arrived to CORS data center server, then the work clock that uses clock module to provide, read u-boot, kernel and the file system of memory module, satellite data is stored in to memory module simultaneously; The memory headroom that SDRAM module is carried out for reference station when operation program, can reduce time of microcontroller reading command and data, thus the efficiency that raising program is carried out.DC power supplier provides working power for Big Dipper module, GPS/GLONASS module, SDRAM module, ARM9 control module, ethernet communication module, reseting module, memory module.

A kind of multimode multi-frequency CORS reference station based on ARM9 the utility model being provided below in conjunction with instantiation describes in detail:

(1) merit sub-module

Merit sub-module GNSS antenna collect GNSS simulating signal be loaded into Big Dipper module and GPS/GLONASS module simultaneously, for two modules provide demodulation need signal.

Merit sub-module specifically comprises merit parallel circuit, and Ba Yi road GNSS Satellite Simulation signal merit is divided into two-way for Big Dipper module and GPS/GLONASS module.The utility model preferably adopts wide bandwidth, and low-loss merit parallel circuit ensures that the satellite-signal of the Big Dipper, GPS and each frequency range of GLONASS passes through.As shown in Figure of description Fig. 5, GNSS Satellite Simulation signal is first divided into two paths of signals by SP2G chip merit, and then the resistance clutter reduction by 0 ohm disturbs, merit divide with filtering clutter after signal loading to Big Dipper module and GPS/GLONASS module.Merit sub-module uses arc turning technology in PCB placement-and-routing, and adds the components and parts such as indispensable resistance, electric capacity, inductance.

(2) ARM9 control module

ARM9 control module is for the treatment of inputting original moonscope value from Big Dipper module, GPS/GLOANSS module, reading command and data from SDRAM, by ethernet communication module, data transmission is arrived to CORS data center server, the work clock that uses clock module to provide, read u-boot, kernel and the file system of memory module, use rolling scenario method to be kept in memory module satellite data, to can download satellite data by Long-distance Control simultaneously.

The ARM9 control module that the utility model provides is used the SoC(System on Chip taking ARM9 as kernel) chip, and transplant (SuSE) Linux OS thereon.Process the GNSS data of Big Dipper module and the transmission of GPS/GLONASS module by RS232 serial ports.After the pre-service of GNSS data, use NTRIP or TCP/IP host-host protocol that GNSS data are sent to CORS data center server, and adopt rolling script that data are stored on local storage.

The utility model ARM9 control module is preferably used the SoC chip S3C2440 using ARM9 as kernel of Samsung as core processor, additional power supply circuit, start reset circuit, clock circuit and control leg signal form the minimum system taking S3C2440 as master controller.S3C2440 and memory module, SDRAM module communication, leave u-boot start-up routine, linux kernel and yaffs file system after transplanting in memory module in, forms ARM9 control module core of the present utility model.

S3C2440 controller is connected by serial communication with Big Dipper module, GPS/GLONASS module, observation data and the navigation message of tri-frequencies of Big Dipper module output Beidou satellite system B1/B2/B3, observation data and the navigation message of three frequencies of GPS/GLONASS module output GPS-L1/L2/L5 and two frequencies of GLONASS-L1/L2.S3C2440 is connected with memory module K9K8G08 by NAND FLASH control unit interface, and in memory module, saved system starts Satellite Observations and the navigation message of indispensable u-boot, linux kernel, yaffs file system and three system eight frequencies.S3C2440 is connected with SDRAM module by SDRAM control interface, and SDRAM module is system running memory space.S3C2440 is connected with network card chip DM9000EP by Ethernet control interface, as network communication link of the present utility model.Reset circuit provides electrifying startup reset signal, is connected with the specific reseting port RESET of S3C2440.Clock circuit provides the clock signal of system operation to be connected with the specific external crystal oscillator port of S3C2440.SDRAM module, reset circuit and clock circuit can use existing chip or circuit.Described ARM9 control module adds the indispensable components and parts such as resistance, electric capacity, and concrete structural drawing of the present utility model is as shown in Figure of description Fig. 1

(3) SDRAM module

SDRAM module adopts high performance SDRAM memory chip to use as internal memory based on ARM9 embedded system, guarantee program at a high speed, stable loading and correctly carrying out, there is transfer efficiency high, reliability is strong, hardware connects the features such as simple.

Realize the operation that S3C2440 high speed is stable, must be equipped with the internal memory of function admirable.Internal memory generally adopts semiconductor memory cell, comprises random access memory (RAM), ROM (read-only memory) (ROM) and high-speed cache (CACHE).What the utility model adopted is that random access memory (RAM) is as Installed System Memory, described SDRAM module adopts the HY57V561620 chip composition of two 32M*16Bit, the mode that two chip blocks adopt and connect, use same chip selection signal, so just form the SDRAM storer that the data-bus width of capacity 64M is 32-bit, described SDRAM module adds the indispensable electronic devices and components such as resistance, electric capacity, as Figure of description Fig. 4.

SDRAM module specific works flow process is as follows:

1) initialization operation.

A) SDRAM at least needs after powering on to wait for that 100-200us, stand-by period finish blank operation order of rear execution.

B) SDRAM carries out after a precharge command, carry out a blank operation order, and these two operations can make all storage unit carry out a precharge, thereby makes device in all arrays in holding state.

C) SDRAM will carry out two self-refresh orders, after each refresh command, all needs to carry out a blank operation order.These operations can make refreshing of SDRAM inside and counter enter normal operating condition, so as for SDRAM mode register programming ready.

D) carry out loading mode register command.

After above-mentioned 4 steps complete, SDRAM just enters normal operating conditions.

2) read-write operation.

A) ARM9 control module is sent control signal, comprise sheet choosing (CS), synchronous clock (CLK), clock useful signal (CKE), written allowance signal (WE), data useful signal (DQM), make SDRAM chip in read-write state.

B) ARM9 control module is sent address signal, comprises row address selection (RAS), column address selection (CAS), row/column address wire (A0-A12), BANK address wire (BA0-BA1), chooses corresponding storage unit.

C) complete reading and writing of data by bidirectional data port (D0-D15).By mode like this efficient, the stable work that realizes SDRAM module.

(4) memory module

Memory module adopts NAND Flash memory chip, for the storage of the bootloader based on ARM9 embedded system, kernel, file system and application program, simultaneously for storing a large amount of real-time satellite signal datas.NANDFlash belongs to nonvolatile memory, storage related data that can be long-time, stable, and the correct and reliable start operation of the system that both ensured, can make again the satellite data of storage repeat and effectively utilization.

In order to realize the Satellite Observations of storage of collected in a large number, must be equipped with jumbo storer.On data-carrier store, select jumbo NAND Flash storer, the utility model has been selected the high-capacity K 9K8G08 chip of the 1G*8Bit of the SLC framework of Samsung.K9F1028 belongs to low-speed peripheral, can not directly be articulated on microprocessor, need to realize by interface circuit the transmission of data.The utility model is selected the upper special NAND Flash storer control interface of S3C2440, and NAND Flash is equivalent to a peripheral hardware of S3C2440, is not positioned at its memory address district.A slice NAND Flash is an equipment, and its data storage adopts layering to divide: 1 equipment=4096 piece; 1=32 pages; 1 page=528 bytes=data block size (512 byte)+OOB block size (16 byte).In every one page, after last 16 bytes (claiming again OOB, Out of Band) are complete for NAND Flash command execution, state use is set, residue 512 bytes are divided into again first half and latter half.Can position first half, latter half of, OOB respectively by NAND Flash order 00h/01h/50h, by the built-in pointed of NAND Flash first address separately.The read-write of NAND Flash completes by operation NAND Flash controller.NAND Flash controller is mapped with one's own special function register in its special register district (SFR) address space, comprising: NFCONF, NFCMD, NFADDR, NFDATA, NFSTAT, NFECC.By writing in its special function register establishing order in NAND Flash chip, thereby realize the read-write of NAND Flash chip, ECC inspection and programming Control.Described memory module adds the indispensable components and parts such as resistance, electric capacity, as shown in Figure of description Fig. 3.

The concrete operations of memory module:

1) NFCONF register is set, configuration NAND Flash.Enable/disable NAND Flash, enable/disable control pin nFCE, initialization ECC, time sequence parameter that NAND Flash is set etc.

2) write order to NFCMD register.Comprise that Read1(reads), Read2(reads), Read ID(reading chip ID), Page Program(writes page), Block Erase(erase block), Read Status(read states) etc. order.

3) to NFADDR register writing address, NAND Flash is sent to address signal.

4) read/write data: the state that detects NAND Flash by register NFSTAT, if state is Ready, starts to read and write NFDATA register and start the read-write operation to NAND Flash.Realize the control of S3C2440 to NAND FLASH storer by query State word.

(5) clock module

Clock module is for generation of the required clock signal of the each module of system.Be that microprocessor, storer or the normal work of various peripherals all need clock signal to guide, and distinct device is due to characteristic difference separately, the frequency of required clock signal is also not quite similar.So the clock module described in the utility model scheme is by generation and manage all kinds of clock signals.

Clock module described in the utility model, for S3C2440 provides system clock, specifically comprises clock generator and S3C2440 clock control logic unit.Clock generator comprises an oscillator (monofier), and two PLL(Phase Locked Loop) unit.The master clock source of clock generator can be from external crystal-controlled oscillation or external clock.In the time adopting external crystal-controlled oscillation, be first linked into monofier in access PLL unit; In the time adopting internal clocking, be directly linked into PLL unit.In PLL unit, generation be FCLK, HCLK, tri-kinds of clock signals of PCLK.FCLK is for ARM920T kernel; HCLK is for ahb bus; PCLK is for APB bus.Described clock module adds indispensable electric capacity electronic devices and components.The circuit diagram of concrete clock module is as shown in Figure of description Fig. 9.Y1 is the crystal oscillator of 12MHz, and C1/C2 is that capacitance is the electric capacity of 15pF.

(6) Big Dipper module and GPS/GLONASS module

Big Dipper module output Beidou satellite navigation information, the satellite navigation information of GPS/GLONASS module output GPS and GLONASS.Big Dipper module, GPS/GLONASS module and merit sub-module are connected, the GNSS simulating signal that diligent sub-module is provided; Big Dipper module, GPS/GLONASS module are connected with power module, and power module provides power supply for it; Big Dipper module, GPS/GLONASS module and ARM9 control module are connected, and ARM9 control module is controlled Big Dipper module, GPS/GLONASS module by serial communication, and satellite navigation information is also transferred to ARM9 control module by serial communication.The utility model has been investigated existing main flow Big Dipper module both domestic and external and GPS/GLOANSS module.Selected the board of the Big Dipper three frequencies that compass in ancient China company model is K505 as Big Dipper module, the board that selection NovAtel company model is OEMV-2 is as GPS/GLOANSS module.

(7) power module

DC power supplier is that the general power supply adaptor of use is the input power that whole reference station is provided as 12V/1A, the input power of 12V/1A provides two kinds of power supplys of 3.3V/1A and 5V/1A through DC-DC change-over circuit for module, for ARM9 control module, clock module, reseting module provides the voltage of 5V, is SDRAM module, memory module, ethernet communication module, Big Dipper module and GPS/GLONASS module provide the voltage of 3.3V.

The utility model DC-DC change-over circuit preferred voltage conversion chip TPS54295, the power supply that adapter is provided is as the input voltage source of voltage transitions chip TPS54295, add resistance, electric capacity, inductance composition 5V and 3.3V two output voltage if necessary in TPS54254 chip periphery, 5V power supply provides working power for ARM9 control module, clock module, reset circuit, and 3.3V power supply provides working power for SDRAM module, memory module, ethernet communication module, Big Dipper module and GPS/GLONASS module.Described power module adds the components and parts such as indispensable resistance, electric capacity, inductance, and concrete power supply architecture figure is as shown in Figure of description Fig. 7.

(8) reseting module

The normal work important role of reset circuit to the utility model CORS reference station reliably.The reset terminal (RESET) of reseting module and S3C2440 chip is connected, and 5V power supply provides working power for reset circuit.The MAX811 reset chip of MAXM company of the preferred U.S. of the utility model.MAX811 chip has the advantages such as low-power consumption, intellectuality, microminiaturization and high reliability, can improve stability and the reliability of reset signal.At the utility model powered on moment, when the supply voltage of 5V reaches certain value, the reset level signal that about 200ms is wide of No. 2 pin MR end output of MAX811 chip, much larger than the S3C2440 needed level pulsewidth that resets, makes S3C2440 reliable reset.Concrete reset circuit schematic diagram is as shown in Figure of description Figure 10.In Figure of description Figure 10, Rs is reset current-limiting resistance, and selecting resistance is 470 ohm; Cs is reset circuit reset capacitance, and selection capacitor's capacity is 100nF; SW-PB is reset key; VDD5V is the working power of the 5V/1A of power module.

(9) ethernet communication module

Ethernet communication module adopts ethernet mac controller, for satellite data after treatment is transferred to CORS data center server.Guarantee has automatic synchronization function and can automatically complete and be configured to be applicable to greatest extent its line bandwidth, realizes stable, the fast transport that the in the situation that of low-power consumption, complete satellite data.The utility model adopts DM9000EP network card chip and network transformer H1102NL, the electric circuit constitute ethernet communication module of additional necessity.

In order to be transferred to satellite data after treatment is stable, rapidly CORS data center server, must be equipped with stable performance, reliable ethernet mac controller.The utility model adopts DM9000EP network card chip as ethernet communication module, it is the integrated single-chip Fast Ethernet mac controller of a height, with the SRAM of general processor interface, 10M/100M Physical layer and 16kB, can automatically complete and be configured to be applicable to greatest extent its line bandwidth, realize stable, the fast transport that the in the situation that of low-power consumption, complete satellite data.Access chip is divided into address port and FPDP, in the time of pin CMD ground connection, is address port; It in the time that pin CMD connects high level, is FPDP.First internal storage is carried out to initialization setting, complete after initialization programming, send pseudo-read write command and just can load current data to internal data buffer zone, can locate storage inside regional address by read write command register, make memory address automatically add 1 according to the word length of current mode bus, next address data will be loaded into internal data buffer zone automatically.The insertion of transmit control register control redundancy check code and filling, its state is recorded in respectively and sends status register 1(03H) and send status register 2(04H), write data to and send bag buffer zone by DMA port, complete the transmission work of data.Described ethernet communication module adds the components and parts such as indispensable resistance, electric capacity, inductance, and concrete joint is as shown in Figure of description Fig. 8.

Software configuration shown in Figure of description Fig. 2 is the function of the utility model data processing, on the (SuSE) Linux OS of transplanting, for application scenarios of the present utility model, designs special application software.First comprise communication software, the utility model is as the long-range long-term use equipment in field, indispensable ethernet communication function, the Ethernet control interface of use S3C2440, special network card chip DM9000EP and network transformer H1102NL form the communication hardware structure of bottom.On the hardware configuration basis forming, transplant NTRIP standard agreement and TCP communication protocol.The data of obtaining from serial ports are transferred to CORS data center server by NTRIP agreement or Transmission Control Protocol.Memory function application is to use rolling script that satellite data is kept in memory module, ensures the trackability of data.Power managed application real-time tracking system free time, according to the difference of free time, tetra-kinds of mode of operations of S3C2440 are set: the switching of normal mode of operation, idle pulley, low-speed mode and park mode, as shown in Figure of description Fig. 6, and then reach the object of saving energy consumption.

The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (10)

1. the multimode multi-frequency CORS reference station based on ARM9, is characterized in that: comprise DC power supplier, merit sub-module, Big Dipper module, GPS/GLONASS module, SDRAM module, ARM9 control module, ethernet communication module, clock module, memory module, reseting module and GNSS antenna;

Described merit sub-module is divided into two-way for the Satellite Simulation signal merit that GNSS antenna is provided, and offers respectively Big Dipper module and GPS/GLONASS module;

Described Big Dipper module is carried out modulation /demodulation and format conversion for the Satellite Simulation signal that merit sub-module is inputted, and provides big-dipper satellite original observed data to ARM9 control module;

Described GPS/GLOANSS module is carried out modulation /demodulation and format conversion for the Satellite Simulation signal that merit sub-module is inputted, and provides GPS and GLONASS satellite original observed data to ARM9 control module;

Described ARM9 control module is for the treatment of the satellite original observed data from Big Dipper module and the input of GPS/GLOANSS module, reading command and data from SDRAM module, be transferred to CORS data center server by ethernet communication module satellite original observed data after treatment; And the work clock that uses clock module to provide, read u-boot, kernel and the file system of memory module, satellite original observed data is stored in to memory module simultaneously;

Described reseting module is for providing electrifying startup reset signal to ARM9 control module;

Described DC power supplier is for providing working power to Big Dipper module, GPS/GLONASS module, SDRAM module, ARM9 control module, ethernet communication module, clock module, reseting module and memory module.

2. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 1, is characterized in that: described ARM9 control module adopts the S3C2440 chip taking ARM9 as kernel.

3. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 2, is characterized in that: described SDRAM module adopts the HY57V561620 chip composition of two 32M*16Bit, the mode that two chip blocks adopt and connect; Described S3C2440 chip is connected with SDRAM module by SDRAM control interface, and described SDRAM module provides system running memory space for ARM9 control module.

4. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 2, it is characterized in that: described memory module adopts K9K8G08 chip, described S3C2440 chip is connected with memory module K9K8G08 chip by NAND FLASH control unit interface; Described reseting module adopts MAX811 reset chip, and described MAX811 reset chip is connected with the reset terminal of S3C2440 chip.

5. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 2, it is characterized in that: described ethernet communication module adopts DM9000EP network card chip, described S3C2440 chip is connected with network card chip DM9000EP by Ethernet control interface.

6. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 2, it is characterized in that: described S3C2440 chip carries out data communication by RS232 serial ports and Big Dipper module and GPS/GLONASS module, described Big Dipper module adopts the K505 Big Dipper three board frequently, and described GPS/GLOANSS module adopts OEMV-2 board.

7. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 1, it is characterized in that: described DC power supplier is used universal power adapter to provide the input power of 12V/1A for this reference station, described 12V/1A input power is converted to 3.3V/1A and two kinds of power supplys of 5V/1A by DC-DC change-over circuit, described 5V/1A power supply provides power supply to ARM9 control module, clock module, reset circuit, and described 3.3V power supply provides power supply to SDRAM module, memory module, ethernet communication module, Big Dipper module and GPS/GLONASS module.

8. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 7, is characterized in that: described DC-DC change-over circuit adopts voltage transitions chip TPS54295.

9. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 1, is characterized in that: between described ARM9 control module and CORS data center server, adopt NTRIP communication protocol or ICP/IP protocol to carry out data transmission.

10. a kind of multimode multi-frequency CORS reference station based on ARM9 according to claim 1, is characterized in that: described merit sub-module comprises SP2G chip and 0 Ohmage; The Satellite Simulation signal that described GNSS antenna provides is divided into two paths of signals by SP2G chip merit, after then disturbing by 0 Ohmage clutter reduction respectively, is loaded into Big Dipper module and GPS/GLONASS module.