CN2491852Y

CN2491852Y - Gravity recording system GPS time synchronizer

Info

Publication number: CN2491852Y
Application number: CN 01239751
Authority: CN
Inventors: 周百力
Original assignee: Institute of Geodesy and Geophysics of CAS
Current assignee: Institute of Geodesy and Geophysics of CAS
Priority date: 2001-04-12
Filing date: 2001-04-12
Publication date: 2002-05-15
Anticipated expiration: 2011-04-12

Abstract

The utility model relates to a G P S synchrotimer used in a gravity register system, which can be widely used in the measurement department, the earthquake department, and the exploration department and the like. The utility model comprises receiving antenna, a GPS-OEM board, a control processor, a driver, a character display, a parallel interface, a dial tray, a memory, a communication interface, and an operation key board and the like. The utility model combines the functions of positioning and the time service together, has the advantages of simple structure, high accuracy, actual time and low power consumption and the like, which can realize the accurate synchronization of remote time, can meet the demands of gravity analog recording method and digital recording method at the same time, is especially applicable for the on-site continuous automatic measurement and the unmanned station measurement.

Description

Gravity register system gps time synchronous device

The utility model relates to a kind of gps time synchronous device, specifically, relates to a kind of gps time synchronous device that is used for the gravity register system, can be widely used in measurement, earthquake, exploration and other department.

Gravimetry not only can be used for studying the earth gravity field and the figure of the earth, and has also obtained using widely aspect geophysical survey, becomes mineral products, oil gas, underground heat, groundwater resource and explores irreplaceable important means.

As the terminal of gravity meter, the gravity register system is being born the task that the signal of gravity meter output is noted with the analog or digital mode.Analog form is to draw the time dependent curve of gravity by strip chart recorder; Digital form then is by form collection and the storage gravimetric data of computing machine with numeral.Yet, present gravity register system, which kind of mode what no matter its adopted is, all has the problem of the following aspects:

1. the time device precision that is disposed is lower, can not satisfy the requirement of current gravimetry development.

2. according to international geodynamics surveillance program, require the unified high precision that adopts of global gravity meter observation

Coordinated Universal Time(UTC) makes the time synchronized of any in the world place acquisition station, is beneficial to global gravity money

The analysis of material.This at present separately the separate configurations system clock the gravity register system, be

Be difficult to accomplish.

3. present gravity register system and since the time device that disposed all be adopt manually to the time

Mode, not only operating process is loaded down with trivial details, and error is also big, can't satisfy the requirement of gravimetric observation.

4. the ability that does not possess real-time demonstration and output three dimensional local information is unfavorable for the open-air gravity survey of flowing

Amount.

5. do not possess the ability that shows Greenwich date, time and Beijing time simultaneously in real time, use

Come very inconvenient.

6. can not be according to the setting in the time interval that the user carried out, output timing markers can't be used automatically

Various time-controlled occasions such as Yu Changtu simulation record.

7. can not provide accurate second signal to the user, can't be applied to the occasion of accurate time transmission, it is answered

Be restricted with scope.

The purpose of this utility model is exactly that problem at above-mentioned existence provides a kind of gps time synchronous device that is used for the gravity register system, adopt GPS and microcomputer technology, collect time service, be positioned one, realize gravity register system and the precise synchronization of Coordinated Universal Time(UTC), simple in structure, precision is high, low in energy consumption.

The purpose of this utility model is achieved in that to be that it is made of parts such as receiving antenna, GPS-OEM plate, processor controls, driver, alphanumeric display, parallel interface, dial, memory, communication interface, operation keyboards.After finishing power-on self-test, the device automatic reception is followed the tracks of, is locked signal from the gps signal of antenna, extracts information such as date, time and three-dimensional position, be converted to ASC II sign indicating number, on alphanumeric display, show high precision time and geographical location information continuously in real time; Simultaneously, also the time interval that is provided with according to the user, export regularly markers automatically, for strip chart recorder provides the printing time signal.In addition, also export serial data to the gravity digital recording system, its system clock is proofreaied and correct, thereby make gravity digital recording system and Coordinated Universal Time(UTC) synchronous.

The utility model compared with prior art has the following advantages and good effect:

1. adopt controlled by single chip microprocessor, simple in structure, easy to operate, changed traditional gravity register system time precision low, need manually to the time working method.

2. round-the-clock, provide high precision time and geographical location information in real time continuously, can satisfy the requirement of gravity simulation record and digital recording mode simultaneously.

3. by the temporal information of device RS-232 communication interface output, can be input to the gravity digital recording system, its system clock is proofreaied and correct, make it and the Coordinated Universal Time(UTC) precise synchronization via the serial communication cable.

4. install the high-precision station-keeping ability that is had, characteristics easy and simple to handle, can provide great convenience the mobile gravimetry in field.

Show the ability of Greenwich date, time and Beijing time when 5. device possesses, help gravimetric observation.

6. device also has automatic output target ability regularly the time, and the user can export corresponding integral point signal by the dial setting-up time at interval, for long figure simulation record provides the automatic control of printing time signal or being used for miscellaneous equipment regularly.

7. device also provides the pps pulse per second signal that the precision of Transistor-Transistor Logic level is better than 1 microsecond, is applied to the occasion of accurate time transmission.

8. the serial data of the RS-232 communication interface output NMEA-0183 communication standard form of device, content forgiven latitude, longitude, highly, numerous information such as speed, direction, date, time, satellite situation, can be widely used in multiple occasion.

9. device has lower power consumption, except that using the 220V alternating voltage, also can adopt battery and direct supply, is easy to connect with various device, helps open-air gravimetry.

10. use this device to change, have application value original gravity register system.

Be described further below in conjunction with accompanying drawing.

Fig. 1 is this device contour structures synoptic diagram; Fig. 2 is this device contour structures rear panel synoptic diagram;

Fig. 3 forms block scheme for this device; Fig. 4 is this device built-up circuit figure (1);

Fig. 5 is this device built-up circuit figure (2).

Wherein: the 1-antenna; The 2-GPS-OEM plate; The 3-processor controls; The 4-parallel interface; The 5-dial; The 6-relay; The 7-strip chart recorder; The 8-driver; The 9-memory; The 10-watch-dog; The indication of 11-power supply; 12-indicates second; The indication of 13-losing lock; The 14-reset key; The 15-options button; 16-gravity digital recording system; The 17-contrast adjustment; 18-bias light switch; The 19-alphanumeric display; The 20-casing; The 21-support; The 22-under-chassis; The 23-antenna socket; 24-exports second; The 25-RS-232 communication interface; The 26-fuse; The 27-supply socket; The 28-power switch.

As shown in Figure 1, alphanumeric display 19, reset key 14, options button 15, contrast adjustment 17, bias light switch 18, power supply indication 11, second indication 12, losing lock indication 13 are installed on the front panel of casing 20.

As shown in Figure 2, antenna socket 23, second output 24, RS-232 communication interface 25, fuse 26, supply socket 27, power switch 28, dial 5 are installed on the rear panel of casing 20.

As shown in Figure 3, the circuit board of this device is installed in the casing 20.Antenna 1 links to each other with the input end of GPS-OEM plate 2; Dial 5 links to each other with the input end of parallel interface 4; The output terminal of the output terminal of parallel interface 4, GPS-OEM plate 2, watch-dog 10, memory 9, options button 15, reset key 14 link to each other with the input end of processor controls 3 respectively; The output terminal of processor controls 3 links to each other with input end, the input end of RS-232 communication interface 25, the alphanumeric display 19 of relay 6 respectively; The output terminal of relay 6 links to each other with strip chart recorder 7, and the output terminal of RS-232 communication interface 25 links to each other with gravity digital recording system 16, and another output terminal of GPS-OEM plate 2 links to each other with the input end of driver 8, the output terminal of driver 8 with export 24 second and link to each other.

After finishing power-on self-test, 2 automatic receptions of GPS-OEM plate are from the gps signal of the L1 wave band of antenna 1, through preposition amplification, narrow-band filtering, frequency synthesis, change by high-speed a/d, be divided into 8 parallel channels, realization is to tracking, the locking of gps signal, with the baud rate output serial data of binary form, 9600baud.Processor controls 3 extracts the information such as date, time and three-dimensional position that obtain on the one hand, is converted to ASC II sign indicating number, is shown on alphanumeric display 19 in the mode of character, and high precision time and geographical location information are provided continuously in real time; Simultaneously, also according to the user by the set time interval of dial 5, output markers regularly automatically is for strip chart recorder 7 provides the automatic control of printing time signal or being used for miscellaneous equipment regularly.On the other hand, also arrive gravity digital recording system 16, call, its system clock is proofreaied and correct, thereby made gravity digital recording system 16 and Coordinated Universal Time(UTC) synchronous by interrupt function by RS-232 communication interface 25 output serial datas.

By Fig. 4, Fig. 5 as can be known, the processor controls 3 of employing is 8032, and it is processing, operation, the control center of total system, and the reception of all signals, storage, demonstration, control are all carried out under its monitoring.Processor controls 3 is by A0-A15 address wire, D0-D7 data line and read RD, write WR, signal such as the RESET that resets controls total system.

The 74LS373 address latch is used to solve the problem of processor controls 3 address buss and data bus time-sharing multiplex.

SS1 crystal oscillator and capacitor C 2, C3 form the crystal oscillating circuit of 12MHz, and linking to each other with X1, the X2 pin of processor controls 3 constitutes the internal oscillator mode, is used to provide the time reference of various microoperations in the processor controls 3.

Rest button K, capacitor C 11, resistance R 10, R11 formation power on and manual reset circuit automatically, make device begin to carry out watchdog routine from the 0000H address location.

The preventing jittering circuit output interrupt request singal that options button 15 constitutes via resistance R 5, R7 and 74LS00 Sheffer stroke gate, the INT1 pin of access control process 3, under the prompting of alphanumeric display 19 on-screen menus, adopt the page turning mode, show in real time successively: GMT (Greenwich mean time), date, the longitude of Beijing time and mensuration, latitude and height.

Memory 9 is divided into program and data memory two parts.Wherein, management, watchdog routine are deposited in the memory under program 27256, and the internal data memory of processor controls 3 is deposited the intermediate result data.The 74LS138 address decoder is deciphered address wire A13-A15, and its output Y2-Y4 as the chip selection signal of parallel interface 4, memory 9, alphanumeric display 19, is conducted interviews to their timesharing by data line by processor controls 3 respectively.

The A mouth of 8255 two-way simultaneous interfaces 4 able to programme is as the data input port of dial 5, the current status data of the dial that collects is offered processor controls 3, according to the 5 determined time intervals of dial, export corresponding integral point signal by the P10 pin of processor controls 3, the complex pipe that constitutes through resistance R 8, R9 and triode N4, N1 drives relay 6 as electronic switch, for strip chart recorder 7 provides the automatic control of printing time signal or being used for miscellaneous equipment timing.Wherein, resistance R 8 links to each other with the base stage of triode N4, the emitter of triode N4 links to each other with the base stage of triode N1, the collector of triode N4 links to each other with the collector of triode N1 and an end of relay R EL1 coil winding, and the other end of relay R EL1 coil winding links to each other with the power supply that resistance R 9, diode D1 constitute.Diode D1 prevents anti-phase overshoot current, for the coil winding of relay 6 provides protection.

8 bit parallel data buss of alphanumeric display 19 directly connect with system data bus; With the reading RD and write the WR control signal of processor controls 3, the sheet of generation alphanumeric display 19 selects E from the Y2 of address decoder 74LS138 output; The control signal that the OPADD A0 of address latch 74ls373, A1 then select as the instruction/data register and read/write is selected.Behind the potentiometer and 16 couples of supply voltage VCC of resistance R dividing potential drop of degree adjusting 17, offer the VD pin as a comparison, in order to regulate the demonstration contrast of alphanumeric display 19.S2 is the control of electroluminescent back-illumination source, by miniature inverter LED1, the 5V DC voltage is converted to the alternating voltage of the 1000Hz about 100V, offers alphanumeric display 19, and it can be used under the low light level or dark condition.

The pulse per second (PPS) of GPS-OEM plate 2 outputs is divided into two-way, one the tunnel after the amplifier that triode N2, resistance R 1, R12 constitute is anti-phase, by the monostable circuit that LM555 and resistance R 4, capacitor C 5, C7 constitute, output to as second green LED of indication 11 arrival of indication pulse per second (PPS); The emitter follower that another road then constitutes by triode N3 and resistance R 13 is via exporting the second signal that 24 precision that offer user's Transistor-Transistor Logic level are better than 1 microsecond second.

When locking satellite is less than 3, when device was in out-of-lock condition, the P12 human hair combing waste of processor controls 3 went out pulse signal, outputed to yellow led as losing lock indication 13 through the 74LS00 Sheffer stroke gate, made its flicker; With it simultaneously, alphanumeric display 19 information that flicker shows " following the tracks of ... "; During losing lock, device can automatically switch to internal clocking, continues the output of retention time demonstration and second signal.

Because the serial data of processor controls 3 output is the Transistor-Transistor Logic level of 0-5V, and 16 configurations of gravity digital recording system is the serial line interface of RS-232C standard, and the electrical code of the two is inconsistent, can not directly carry out communication.For this reason, set up serial transceiver MAX202, linked to each other with its input end by the serial port output terminal of processor controls 3, the output terminal of serial transceiver links to each other with RS-232 communication interface 25, the asynchronous serial communication of implement device and gravity digital recording system 16.

For improving antijamming capability, device has also adopted the MAX690 as watch-dog 10, the P11 pin of its WRI pin and processor controls 3 links, be triggered once every 1.6 seconds, inquire about the correctness of the software execution of processor controls 3 at any time, in case discovery procedure produces the operation confusion under extraneous strong jamming, go out 50 milliseconds reset pulse by its RES human hair combing waste at once, processor controls is implemented to force " resetting ", make program start anew to carry out, so just avoided the generation of " deadlock " phenomenon.In addition, watch-dog 10 is powered to GPS-OEM plate 2 by the VOUT pin.Just often, VOUT links to each other with supply voltage VCC; In case power fail, VOUT will automatically switch to VBAT and link to each other, reserve battery B1 is inserted, keep 2 power supplies of GPS-OEM plate.

According to above design concept, the utility model adopts following program:

One, master routine:

The function of master routine is that each interface is carried out initialization: the working method of parallel interface 4, alphanumeric display 19 and processor controls 3 serial ports is set, interrupt mode and preset initial value etc. for storehouse, data-storing unit and tag unit.After judging and receiving the GPS information data, the information such as date, time and three-dimensional position that obtain are extracted, be converted to ASC II sign indicating number; In the time of will the Coordinated Universal Time(UTC) being converted into Beijing, store corresponding data cell respectively into, and by RS-232 communication interface 25 output serial datas.Simultaneously, read the dial 5 current states that set, according to its determined time interval, by the corresponding integral point signal of relay 6 outputs; Whether inquiry unit is in out-of-lock condition, if losing lock then makes losing lock indication 13 flickers, and by display reminding information on the alphanumeric display 19; Read the current page number in the tag unit, pack into and show corresponding page or leaf content.Then, return said process heavily again.Have only when options button 15 sends interrupt request, processor controls 3 just stops to carry out master routine then removes to carry out interruption subroutine.After end of subroutine, the master routine that the side gets back to original execution again works on.Master routine adopts modular structure, and is independent mutually between each module.

Two, interrupt service routine:

After the interrupt request singal that response options button 15 sends; enter this interrupt service routine immediately; after closing interruption, keeping the scene intact; read the new page number that options button 15 is determined; replace original page number; from data memory, take out and the corresponding page or leaf of new page number content, be encased in the display buffer of alphanumeric display 19, show longitude, latitude and the height of GMT (Greenwich mean time), date or Beijing time and mensuration.After opening interruption, recovery scene, carry out the RETI instruction, interrupt turning back to master routine.

Claims

1, a kind of gravity register system gps time synchronous device is characterized in that this device is made up of following parts, and its annexation is: antenna (1) links to each other with the input end of GPS-OEM plate (2); Dial (5) links to each other with the input end of parallel interface (4); The output terminal of the output terminal of parallel interface (4), GPS-OEM plate (2), watch-dog (10), memory (9), options button (15), reset key (14) link to each other with the input end of processor controls (3) respectively; The output terminal of processor controls (3) links to each other with input end, the input end of RS-232 communication interface (25), the alphanumeric display (19) of relay (6) respectively; Another output terminal of GPS-OEM plate (2) links to each other with the input end of driver (8); The output terminal of driver (8) links to each other with second output (24).

2, by the described a kind of gravity register system gps time synchronous device of claim 1, it is characterized in that relay (6) links to each other with the input end of strip chart recorder (7).

3, by the described a kind of gravity register system gps time synchronous device of claim 1, it is characterized in that the output terminal of RS-232 communication interface (25) links to each other with the input end of gravity digital recording system (16).

4, by the described a kind of gravity register system gps time synchronous device of claim 1, it is characterized in that the resistance R 8 in the relay (6) links to each other with the base stage of triode N4, the emitter of triode N4 links to each other with the base stage of triode N1, the collector of triode N4 links to each other with the collector of triode N1 and an end of relay R EL1 coil winding, and the other end of relay R EL1 coil winding links to each other with the power supply that resistance R 9, diode D1 constitute.

5, by the described a kind of gravity register system gps time synchronous device of claim 1, the serial port output terminal that it is characterized in that processor controls (3) links to each other with the input end of serial transceiver, and the output terminal of serial transceiver links to each other with RS-232 communication interface (25).