CN201467156U - Data acquisition and communication device for moonlet controller local area network - Google Patents
Data acquisition and communication device for moonlet controller local area network Download PDFInfo
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Abstract
The utility model relates to a data acquisition and communication device for a moonlet controller local area network, which comprises a power management module, a central control unit, a bidirectional bus transceiver, a CAN bus controller, a CAN bus transceiver, an A/D acquisition module and an input interface filter circuit, wherein the power management module supplies power for the overall system; the central control unit is used for controlling the bidirectional bus transceiver, the CAN bus controller and the A/D acquisition module; the bidirectional bus transceiver is used for switching the chip level; the CAN bus controller supports the technical specifications of the CAN bus; the CAN bus transceiver is directly and electrically connected with the physical bus; the CAN bus controller and the CAN bus transceiver realize data communication through two data receiving-transmitting wires; the A/D acquisition module is used for acquiring analog quantity data, converting the analog quantity data into digital quantity data and inputting the digital quantity data to the central control unit; and the input interface filter circuit is used for filtering the analog quantity. Since the A/D acquisition module is used for acquiring the analog quantity on the moonlet, the dynamic acquisition range is obviously extended as compared with the prior art, and the power consumption is lower. The data acquisition and communication device realizes the acquisition and the communication of the digital quantity and the analog quantity on the moonlet, and has the advantages of favorable extensibility and high reliability.
Description
Technical field
The utility model relates to data acquisition and communicator on a kind of star, particularly a kind of data acquisition and communicator that is applicable to small satellite controller local area network.
Background technology
Moonlet is meant weight less than 1000 kilograms satellite, track be positioned at mostly 1000 kilometers with area of space.Moonlet not only is applied in various aspects such as communication, remote sensing, astronomy.It also is applicable to carries out testing of new technique, and is easy to form satellite constellation on different tracks, thereby realizes the function that single satellite can't be realized.Because it is with low cost that moonlet has, the emission cycle is short, maneuverability, is convenient to upgrade and advantage such as is widely used, and is being subjected to the extensive concern of more and more national in the world.
At present, on the moonlet the most frequently used and one of the most promising bus be controller local area network (Controller AreaNetwork is hereinafter to be referred as CAN) bus.Moonlet data acquisition and communication comprise digital data acquisition and analog acquisition.The digital quantity of moonlet is by the transmission of CAN bus interface, and analog quantity is gathered by the A/D module.At present, article of publishing and patent, for the research of data acquisition on the star and communicator, mostly at a certain load, perhaps other bus interface, rather than at the moonlet data acquisition with CAN bus interface and the research of communicator.
The CAN bus is one of most widely used fieldbus in the world at present, also is one of the most rising fieldbus.This is because the CAN bus has the characteristics of a lot of AEROSPACE APPLICATION: the CAN bus has low cost, high anti-electromagnetic interference, high total line use ratio, far data transmission distance (reaching 10km), high-speed data transmission speed (up to 1Mbps), fault processing and error-detection mechanism can be retransmitted automatically reliably, communication is flexible, and node withdraws from function and characteristics such as bus automatically under wrong serious situation.The space flight " No. one, Tsing-Hua University " of China emission, many moonlets such as " receive No., star " have all adopted principal and subordinate's two cover CAN buses as data/address bus on the star.Satellite technology company of Surrey university (SSTL) also repeatedly uses the CAN bus as many moonlet buses, and has obtained and flown successfully.
Along with the enhancing day by day of the develop rapidly of microelectric technique and space tasks to high performance demands, existing aerospace level radioresistance device can not satisfy the demand of present spacecraft high performance system far away, makes the application of high-performance commercial devices Commercial-Off-The-Shelf (COTS) in the space become possibility.The A/D acquisition module of this device has adopted a slice army temperature level commercial devices AD7890, this also be NASA recommend can be used for one of COTS device of space flight.
Summary of the invention
The purpose of this utility model is, overcome the demand that existing aerospace level radioresistance device can not satisfy present spacecraft high performance system far away, thereby provide an a kind of use army temperature level commercial devices (to comprise the A/D acquisition chip, the CAN bus control unit) collection that data acquisition and communicating devices that make, that be specially adapted to small satellite controller local area network, this device can realize digital quantity, analog quantity with communicate by letter.
The purpose of this utility model is achieved in that
Data acquisition that is applicable to small satellite controller local area network and communicating devices that the utility model provides comprise:
Power management module 1, for each module in the whole system provides power supply, by the DC-DC conversion, the voltage of output 2.5V and 3.3V is given central control unit 2 and 3 power supplies of bidirectional bus transceiver;
CAN bus control unit 4 is supported CAN bussing technique standard 2.0A and 2.0B, can send and acceptance criteria frame and expansion frame, has the function that accepts filter with information management simultaneously;
CAN bus transceiver 5 links to each other with physical bus (CANH and CANL) is directly electric, and the digital signal that the CAN bus control unit is produced is converted to the signal that is suitable for sending on bus, finish differential transmission and reception to bus; Realize data communication by two data transmit-receive line RXD and TXD between described CAN bus control unit module 4 and the described CAN bus transceiver module 5;
A/D acquisition module 6 is converted to digital quantity with analog quantity and inputs to central control unit 2, and every circuit-switched data is made up of 1 start bit, 3 bit ports sign position and 12 transformation result data bit; Described A/D acquisition module 6 has 8 tunnel analog quantity input VIN1-VIN8, the shared common port of all inputs, and 8 tunnel analog quantitys enter the input of A/D acquisition module 6 by input interface filter circuit 7; Control signal and the clock signal of central control unit 2 by A/D acquisition module 6 is provided selected ALT-CH alternate channel, realizes the timesharing multi pass acquisition;
Input interface filter circuit 7 carries out filtering to the analog signals of importing; Have 8 the tunnel, insert two leaded multilayer ceramic capacitor that strobe respectively at every road analog quantity input and earth terminal.
In above-mentioned technical scheme, also comprise 2 road high-speed photoelectric couplers, described high-speed photoelectric coupler is used for the antijamming capability (as shown in Figure 1a) of enhanced system in system; The TXD of CAN transceiver module 82C250 (transmission data input pin) can link to each other (as shown in Figure 1a) by the buffer circuit that high speed photo coupling 6N137 constitutes with RXD (reception data output end), can directly be connected (shown in Fig. 1 b) with RX0 (reception data input pin) again with the TX0 (transmission data output end) of controller module SJA1000, the transmission data input pin of 82C250 links to each other with the delivery outlet OT of second 6N137 end, receives data output end and links to each other with input port-IN end of first 6N137.
In above-mentioned technical scheme, described power management module 1 has the 5V of finishing voltage to 2.5V, finish 5V voltage to and 3.3V voltage between conversion, constitute by the power supply chip of M.S.Kennedy company.
In above-mentioned technical scheme, described central control unit 2 adopts the FPGA (the reliability height is fit to the aerospace level and uses) of Xilinx radiation hardened; The interface level of described FPGA links to each other with CAN bus transceiver 4 through the bidirectional bus transceiver module.
In above-mentioned technical scheme, bidirectional bus transceiver 3 needs to adopt aerospace grade standards or army's temperature level and the device of successful flight experience, the aerospace level device that adopts AEROFLEX company to develop is here arranged.
In above-mentioned technical scheme, described CAN bus control unit 4 and CAN bus transceiver 5 adopt the chip of technical grade.The Surrey university research confirms that the CAN bus control unit of technical grade and CAN bus transceiver are after standing 10Krad irradiation, and performance does not have obvious decline, the application of suitable moonlet.
In above-mentioned technical scheme, selected A/D acquisition module 6 is commercial A/D chips of army's temperature level that can be used for aerospace level aerial mission that NASA (US National Aeronautics and Space Administration) recommends.It is compared with general aerospace level A/D, has analog quantity input dynamic range big (avoiding using the input level shifting circuit), ALT-CH alternate channel number many (avoiding using the input variable connector), the characteristics of (maximum 50mW, 75uW under the resting state) low in energy consumption.
In above-mentioned technical scheme, described leaded multilayer ceramic capacitor is respectively (the leaded multilayer ceramic capacitor volume is little, and the relative temperature rate of change is little) of 0.1uF and 10uF.
Digital data acquisition function of the present utility model realizes by CAN bus control unit and CAN bus transceiver module, because the CAN bus has two-way data transmit-receive function, so this device also has the function of data communication.The collection of CAN bus data with communicate by letter, carry out according to the CAN bus protocol, four kinds of frame formats are arranged: Frame, remote frame, error frame and overload frame in the CAN bus protocol communication format.Wherein the transmission of Frame and remote frame need be carried out under the control of controller, and the transmission of error frame and overload frame takes place and overload to carry out automatically when taking place in mistake.Therefore generally only consider the structure of preceding two frames.CAN bus protocol data frame structure is as shown in table 1, and wherein data fields is no more than 8 bytes at most, if data surpass 8 bytes, will adopt second frame to send.Remove data outside the venue, other each structure is added automatically by the CAN bus interface module.And when Data Receiving, by the CAN bus interface module this frame is extracted equally, obtaining wherein data, logical then central control unit 2 carries out data extract.
Table 1CAN data frame structure table
| Frame is initial | The arbitration field | Controlling filed | Data fields | The CRC field | The ACK field | Frame end |
Analog acquisition function of the present utility model realizes by A/D acquisition module 6.The A/D module has 8 tunnel analog quantity input VIN1-VIN8, the shared common port of all inputs, and 8 tunnel analog quantitys are passed through capacitor filtering respectively, enter the input of A/D module.Control signal and the clock signal of central control unit 2 by A/D acquisition module 6 is provided selected ALT-CH alternate channel, realizes the timesharing multi pass acquisition.
Advantage of the present utility model is:
The utility model adopts FPGA as key control unit, and FPGA is a widely used control unit on the star, and the aerospace level FPGA of companies such as Xilinx development has characteristics such as radioresistance, high-low temperature resistant, low-power consumption and speed is fast.Therefore the utility model does not adopt traditional monolithic processor controlled communication mode, and has developed the CAN bus communication module based on FPGA, and the PCB size has also been dwindled in the application of moonlet preferably, has very high reliability.
Owing to the programmable features of FPGA, be convenient to system hardware upgrading and expansion in the future more in the system of the present utility model.
The utility model not only has the function of data acquisition, also has the function that data send, and has two-way data communication function.
A/D acquisition module of the present utility model has the function that multi-analog is gathered, and can gather separately a certain road or a few road, also can carry out eight tunnel circle collection.Analog quantity input range big (10V～10V), (maximum 50mW, 75uW under the resting state) low in energy consumption.
System of the present utility model has reduced power consumption and weight, has dwindled volume, and special suitable space uses.
Description of drawings
Fig. 1 a is that system of the present utility model forms schematic diagram
Fig. 1 b is that system of the present utility model forms schematic diagram
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further details below in conjunction with drawings and Examples.
With reference to figure 1b, make a data acquisition unit that is applicable to the moonlet that adopts the CAN bus, by power management module 1, be used to carry out the central control unit 2 of chip sequencing control, the bidirectional bus transceiver 3 that is used for the chip level conversion, the CAN bus control unit 4 of finishing the communication of CAN bus data, the CAN bus line data transceiver 5 that links to each other with physical bus, A/D acquisition module 6 and the input interface filter circuit 7 that the analog signals of importing carries out filtering is formed; The radiation hardened FPGA that adopts Xilinx is as central control unit, finish the initialization of register of CAN bus control unit, and employing inquiry mode, produce address latch signal, chip selection signal, read enable signal and write enable signal, simulated dual is to the read-write sequence of address date multiplex bus, realize the reception and the transmission of data. central control unit 2 is by control A/D acquisition module 6, produce enabling signal, received frame synchronizing signal, transmission frame synchronizing signal and clock signal, realize the collection of multichannel analog amount.
Wherein, power management module 1 adopts MSK5102-2.5H and MSK5102-3.3H, and this power management module 1 is shared device supply power voltage 5V, and the voltage that is converted to 2.5V and 3.3V is supplied with FPGA.The output 2.5V of power management module 1 and 3.3V meet the Vint (core voltage) of FPGA respectively, Vcco (Bank voltage), and the GND end is the earth terminal of entire equipment.
CAN bus control unit 4, CAN bus transceiver 5, the shared device supply power voltage 5V of unconverted is used in the power supply of A/D acquisition module 6.
The central control unit 2 that is used to carry out the chip sequencing control adopts the FPGA of Xilinx company radiation hardenings, and its model is XQVR-1000, and its work clock is 40MHZ, is connected to by the crystal oscillator output on the GCLK pin of FPGA.FPGA directly is electrically connected with the bidirectional bus transceiver.
CAN bus control unit 4 adopts the SJA1000 of Philips company as CAN bus control unit chip;
CAN bus transceiver 5 is selected the 82C250 of Philips company for use;
A/D acquisition module 6 adopts AD7890-10 (the army's temperature level) chip of ADI company to finish the analog acquisition on the star.To be 12 in one 8 passage, input voltage range be the A/D acquisition chip of ± 10V for this.AD7890-10 be NASA recommend can be used for one of COTS device of space flight.
Shown in Fig. 1 a and 1b, two pins of FPGA select port DIR1, DIR2 line to link to each other with the direction of bidirectional bus transceiver; And output enable port OE1 and OE2 end ground connection make the output of bidirectional bus transceiver total for making energy state.Bidirectional bus transceiver 54ACS164245 can be used as 16 or two 8 bidirectional bus transceivers uses, and the design is used as it as the latter.
If realize data communication by two data transmit-receive line RXD and TXD between CAN bus control unit 4 and the CAN bus transceiver 5. adopt high-speed photoelectric coupler 6N137, then the TXD of CAN bus transceiver 82C250 (transmission data input pin) can link to each other (as shown in Figure 1a) by the buffer circuit that 6N137 constitutes with RXD (reception data output end) end, can directly be connected (shown in Fig. 1 b) with RX0 (reception data input pin) again with the TX0 (transmission data output end) of CAN bus control unit SJA1000, the transmission data input pin of 82C250 links to each other with the delivery outlet OT of the second road 6N137 end, receives data output end and links to each other with input port-IN end of first via 6N137.
The 5 Ω resistance that play metering function of respectively connecting between the CANH of CAN bus transceiver 5 and CANL pin and the CAN physical bus, the leaded multilayer ceramic capacitor of difference 30pF in parallel on CANH and CANL pin, the decoupling capacitor of 0.1uF in parallel between High-frequency Interference on the filtering bus and the anti-electromagnetic radiation, its power end and ground.The RS pin of 8C250 (slope resistance input) connects ground connection behind the 47K resistance, and this has reduced radio frequency interference, owing to used the integrated transceiver circuit of 82C250, CAN bus control unit SJA1000 has used bypass functionality, this moment SJA1000 RX1 pin ground connection.
A/D acquisition module 6 adopts AD7890-10 (army's temperature level) chip.8 road analog input ends of circuit, are operated by the break-before-make mode when multichannel is switched according to 3 bit port address choice by variable connector.REF OUT/REF IN is a reference voltage output/input.Both external reference voltage can be used, internal reference voltage can be used again.The design uses internal reference voltage, inserts the ceramic disc capacitor of one 0.1 μ F this moment between this end and simulation ground.The SMODE of AD7890 connects high level, makes chip operation outside under the clock module.The capacitance of Cext pin has determined the internal delay time pulse that AD7890 begins to start, according to actual conditions.Here between Cext pin and earth terminal, inserted the electric capacity of 120pF.SCLK, TFS, RFS, DATAIN pin are respectively input end of clock, the transmission frame synchronizing signals of AD7890, received frame synchronizing signal and data input pin.AD7890 interface level standard is 5V TTL.Because this four signal line is to be sent by FPGA, and the signal of FPGA port 3.3V LVCMOS level standard can drive the chip of 5V Transistor-Transistor Logic level standard, therefore, this four signal line can directly link to each other with AD7890.The DATAOUT pin is the translation data output of AD7890, because it is a 5V Transistor-Transistor Logic level standard, and when therefore being connected with the FPGA module, must be through level conversion.As shown in Figure 1, here the DATAOUT end is connected on the pin of bidirectional bus transceiver B mouth free time, is connected on the signal pins of FPGA from A mouth pin corresponding with it.
Input interface filter circuit 7 carries out filtering to the analog signals of importing; Have 8 the tunnel, every road analog quantity input and earth terminal are inserted two leaded multilayer ceramic capacitor that strobe respectively.Described leaded multilayer ceramic capacitor be respectively 0.1uF and 10uF's (the leaded multilayer ceramic capacitor volume is little, and the relative temperature rate of change is little).
In system, can be provided be used for enhanced system antijamming capability 2 road high-speed photoelectric couplers (as Fig. 1 a), the transmission data input pin of CAN transceiver 5 with receive buffer circuit that data output end constitutes by high-speed photoelectric coupler and link to each other or directly be connected with the transmission data input pin with the reception data output end of CAN bus control unit 4; The transmission data input pin of CAN bus transceiver 5 links to each other with the delivery outlet OT of the second road high-speed photoelectric coupler end, receives data output end and links to each other with the input port-IN end of first via high-speed photoelectric coupler.
Also high-speed photoelectric coupler can be set,, cause traffic rate or distance to reduce because it can increase the propagation delay time of the effective loop signal of CAN bus; Since the CAN transceiver that adopted itself possess moment anti-interference, reduce radio frequency interference (RFI) and realize thermo-lag ability, its current limit circuit also provides the further protection to bus, and high-speed photoelectric coupler also can not must be set; If, can not adopt photoelectricity to isolate, so that system reaches maximum traffic rate or distance (shown in Fig. 1 b) so the on-site transfer distance is near, electromagnetic interference is little.
Should be noted that and understand, under the situation that does not break away from the desired spirit and scope of the present utility model of accompanying Claim, can make various modifications and improvement the utility model of foregoing detailed description.Therefore, the scope of claimed technical scheme is not subjected to the restriction of given any specific exemplary teachings.
Claims (8)
1. a data acquisition and communicating devices that is used for small satellite controller local area network comprises:
Power management module (1), for each module in the whole system provides power supply, by the DC-DC conversion, the voltage of output 2.5V and 3.3V is given the power supply of central control unit (2) and bidirectional bus transceiver (3);
Central control unit (2) is used to control bidirectional bus transceiver (3) and CAN bus control unit (4), simulation CAN bus timing;
Bidirectional bus transceiver (3) is used to carry out the chip level conversion, realizes the level match between 3.3V I/O interface and the 5V TTL interface;
CAN bus control unit (4) is supported CAN bussing technique standard 2.0A and 2.0B, can send and acceptance criteria frame and expansion frame, has the function that accepts filter with information management simultaneously;
CAN bus transceiver (5) links to each other with physical bus is directly electric, and the digital signal that the CAN bus control unit is produced is converted to the signal that is suitable for sending on bus, finish differential transmission and reception to bus; Realize data communication by two data transmit-receive line RXD and TXD between described CAN bus control unit module (4) and the described CAN bus transceiver module (5);
A/D acquisition module (6) is gathered analog data, is converted to digital data and inputs to central control unit (2), and every circuit-switched data is made up of 1 start bit, 3 bit ports sign position and 12 transformation result data bit; Described A/D acquisition module (6) has 8 tunnel analog quantity input VIN1-VIN8, the shared common port of all inputs, and 8 tunnel analog quantitys enter the input of A/D acquisition module (6) by input interface filter circuit (7); Central control unit (2) is selected ALT-CH alternate channel by the control signal and the clock signal of A/D acquisition module (6) are provided, and realizes the timesharing multi pass acquisition;
Input interface filter circuit (7) carries out filtering to the analog signals of importing; Have 8 the tunnel, insert two leaded multilayer ceramic capacitor that strobe respectively at every road analog quantity input and earth terminal.
2. by described data acquisition and the communicating devices that is used for small satellite controller local area network of claim 1, it is characterized in that, comprise also being used for 2 road high-speed photoelectric couplers of antijamming capability of enhanced system that the transmission data input pin of described CAN transceiver (5) is with to receive buffer circuit that data output end constitutes by described high-speed photoelectric coupler continuous or directly be connected with RXO (reception data input pin) with the TXO (transmission data output end) of CAN bus control unit (4); The transmission data input pin of CAN bus transceiver (5) links to each other with the delivery outlet OT of the second road high-speed photoelectric coupler end, receives data output end and links to each other with the input port-IN end of first via high-speed photoelectric coupler.
3. by described data acquisition and the communicating devices that is used for small satellite controller local area network of claim 1, it is characterized in that, described power management module (1) is finished 5V voltage to 2.5V, finish 5V voltage to and 3.3V voltage between conversion, constitute by power supply chip by M.S.Kennedy company.
4. by described data acquisition and the communicating devices that is used for small satellite controller local area network of claim 1, it is characterized in that, described central control unit (2) adopts the FPGA of Xilinx radiation hardened, and this central control unit (2) links to each other with described CAN bus control unit (4) through bidirectional bus transceiver (3).
5. by described data acquisition and the communicating devices that is used for small satellite controller local area network of claim 4, it is characterized in that described bidirectional bus transceiver (3) adopts the aerospace level device of AEROFLEX company.
6. by described data acquisition and the communicating devices that is used for small satellite controller local area network of claim 1, it is characterized in that described CAN bus control unit (4) and CAN bus transceiver (5) adopt the chip of technical grade.
7. by described data acquisition and the communicating devices that is used for small satellite controller local area network of claim 1, it is characterized in that, described A/D acquisition module (6) is the commercial A/D chip of army's temperature level that US National Aeronautics and Space Administration is used for aerospace level aerial mission, the maximum 50mW of power consumption, 75uW under the resting state.
8. by described data acquisition and the communicating devices that is used for small satellite controller local area network of claim 1, it is characterized in that described leaded multilayer ceramic capacitor is respectively 0.1uF and 10uF.
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| CN2009201066655U CN201467156U (en) | 2009-04-01 | 2009-04-01 | Data acquisition and communication device for moonlet controller local area network |
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| CN2009201066655U CN201467156U (en) | 2009-04-01 | 2009-04-01 | Data acquisition and communication device for moonlet controller local area network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984096A (en) * | 2012-10-12 | 2013-03-20 | 中国船舶重工集团公司第七一九研究所 | Assembling method for controller area network (CAN) data frames applied in ship dynamic information acquisition device |
| CN104166353A (en) * | 2014-08-18 | 2014-11-26 | 中国航天科技集团公司第九研究院第七七一研究所 | Multi-channel data collection control circuit and method for satellite |
| CN105763406A (en) * | 2016-04-01 | 2016-07-13 | 北京兆易创新科技股份有限公司 | CAN bus transceiver |
| CN108616282A (en) * | 2018-03-30 | 2018-10-02 | 四川斐讯信息技术有限公司 | A kind of anti-interference equipment |
-
2009
- 2009-04-01 CN CN2009201066655U patent/CN201467156U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984096A (en) * | 2012-10-12 | 2013-03-20 | 中国船舶重工集团公司第七一九研究所 | Assembling method for controller area network (CAN) data frames applied in ship dynamic information acquisition device |
| CN102984096B (en) * | 2012-10-12 | 2015-05-13 | 中国船舶重工集团公司第七一九研究所 | Assembling method for controller area network (CAN) data frames applied in ship dynamic information acquisition device |
| CN104166353A (en) * | 2014-08-18 | 2014-11-26 | 中国航天科技集团公司第九研究院第七七一研究所 | Multi-channel data collection control circuit and method for satellite |
| CN105763406A (en) * | 2016-04-01 | 2016-07-13 | 北京兆易创新科技股份有限公司 | CAN bus transceiver |
| CN105763406B (en) * | 2016-04-01 | 2019-09-17 | 北京兆易创新科技股份有限公司 | A kind of CAN bus transceiver |
| CN108616282A (en) * | 2018-03-30 | 2018-10-02 | 四川斐讯信息技术有限公司 | A kind of anti-interference equipment |
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