CN204068992U - A kind of gps time synchronizer for large power, electrically magnetic transmitter - Google Patents

Abstract

The utility model discloses a kind of gps time synchronizer for large power, electrically magnetic transmitter, comprising: comprise GPS receiver module, main control unit; Described GPS receiver module communicates to connect with main control unit respectively; Described GPS receiver module catches gps satellite signal, and by gps satellite signal conversion process, described GPS receiver module exports the data after conversion to described main control unit, and the time signal obtaining standard after described main control unit decoding transfers to host computer display.The utility model can generate the pulse per second (PPS) of continuous print high accuracy and remain accurately synchronous reliably, achieves split-second precision signal and exports.Even if when gps signal occurs abnormal, synchronizer self also can produce continuous print PPS and ensure the synchronous of gps time.Under strong electromagnetic, no matter whether gps signal is normal, can keep quite high precision and reliability.

Description

A kind of gps time synchronizer for large power, electrically magnetic transmitter

Technical field

The utility model relates to a kind of gps time synchronizer, and particularly a kind of gps time synchronizer for large power, electrically magnetic transmitter, belongs to communication technical field.

Background technology

Electromagnetic method is by obtaining earth medium to the response injecting electromagnetic field, obtaining the method for underground geologic bodies or ore body conductivity structure information.Due to the satisfactory electrical conductivity that metallic ore has usually, therefore, the most effective geophysical exploration means of metallic ore are found in electromagnetic prospecting.For electromagnetic prospecting, be unable to do without reliable electromagnetic survey instrument and equipment.And in the development of electromagnetic prospecting instruments, synchronous between design transmitter and receiver is again a wherein very crucial technology, because in the field trial of reality, Receiver And Transmitter all carries out the launching and receiving of signal automatically according to the frequency meter set in advance, without the need to manual operation, so need to ensure the synchronous of launching and receiving, thus transmitter and receiver needs the synchronous of the time of carrying out.

About time synchronizing method, current most popular method adopts GPS to carry out synchronously.Adopt identical GPS chip in the transmitters and receivers respectively, because GPS is not synchronously by distance and the influence of topography, and the time accuracy that GPS exports is very high, therefore adopts GPS to be a kind of reasonable method of synchronization.But existing gps time synchronizer often can ignore the problem that GPS looks for star, simultaneously all stronger to the dependence of gps signal, mostly they are find surely at hypothesis gps signal one and design under the prerequisite that can not lose efficacy.Because gps satellite signal is subject to many factors impact when spatial, can directly cause signal conditioning undesirable.Such as, under the low noises such as indoor and forest, block, the phenomenon such as multipath and interference comparatively seriously, the gps signal power causing GPS receiving chip to receive is subject to serious weak.GPS chip its can catch number of satellite and obviously reduce.When the number of satellite that GPS chip captures is lower than certain value, GPS chip just cannot obtain gps time information accurately.GPS chip is subject to the impact of external environment in addition, and the PPS (pulse per second (PPS)) that particularly it exports under strong electromagnetic environment can be mingled with disturbing signal, and likely cause PPS to lose efficacy, device can not normally run.

Utility model content

The technical problems to be solved in the utility model is: provide a kind of precision high, stable, the jamproof gps time synchronizer for large power, electrically magnetic transmitter.

For solving the problems of the technologies described above, the utility model provides following technical scheme:

The utility model provides a kind of gps time synchronizer for large power, electrically magnetic transmitter, comprising: GPS receiver module, main control unit;

Described GPS receiver module communicates to connect with main control unit respectively;

Described GPS receiver module catches gps satellite signal, and by gps satellite signal conversion process, described GPS receiver module exports the data after conversion to described main control unit, and the time signal obtaining standard after described main control unit decoding transfers to host computer display.

Wherein more preferably, also comprise counting unit, described counting module and described main control unit communicate to connect;

Described counting unit provides continuous print frequency signal to described main control unit, and described main control unit transfers to described host computer to the time signal obtaining standard after the data syn-chronization after changing with GPS module after frequency signal process and shows.

Wherein more preferably, described main control unit comprises: main control unit comprises control unit and processing unit;

Described control unit is connected by bus communication with described processing unit;

Described GPS receiver module exports the gps data after conversion to described processing unit, and after described processing unit demodulation, process gps data, the time signal of outputting standard is to described host computer display;

Count after the frequency frequency multiplication that described main control unit exports described counting unit, and count signal is transferred to described processing unit, described processing module is incited somebody to action and count signal is converted to pps pulse per second signal, and the time signal obtaining standard after the data syn-chronization after changing pps pulse per second signal and GPS module transfers to described host computer and shows.

Wherein more preferably, described control unit is FPGA and processing unit DSP.

Wherein more preferably, described processing unit comprises: a URAT module, GPS decoder module, time synchronized module, the 2nd URAT module, data processing module, external interrupt module;

A described URAT module, described GPS decoder module, described time synchronized module, described 2nd URAT module sequentially communicate to connect, and described data processing module, described interrupt module, described time synchronized module sequentially communicate to connect;

After one URAT module receives the gps data of described GPS receiver module transmission, be forwarded to described GPS decoder module, gps data is decoded into the time by described GPS decoder module, state information is sent to described time synchronized module, and temporal information, state information are processed into the standard time and are sent to host computer by described 2nd URAT module by described time synchronized module;

Described data processing module receives the count information of control module or the transmission of GPRS receiver module and changes into pps pulse per second signal, and pps pulse per second signal is transferred to described external interrupt module, pps pulse per second signal is converted to time signal and transfers to described time synchronized module by described external interrupt module, and the time signal of time signal and the transmission of GPRS receiver module is processed into the standard time and is sent to host computer by described 2nd URAT module by described time synchronized module.

Wherein more preferably, described control unit comprises: times frequency module, the first counting module, data buffer area;

Described times of frequency module, described first counting module, described data buffer area sequentially communicate to connect;

Deliver in described first counting module after the frequency process of frequency multiplication that counting unit is transmitted by described times of frequency module and count, after the count value in described first counting module reaches set point, then count value is delivered to described data buffer area.

Wherein more preferably, constant-temperature crystal oscillator feedback control circuit is also comprised;

Described constant-temperature crystal oscillator feedback control circuit comprises: the second counting module, D/A converter module, operational amplification circuit;

Described times of frequency module, described second counting module, described data processing module, described D/A converter module, described operational amplification circuit, described constant-temperature crystal oscillator sequentially communicate to connect;

Described times of frequency module will be sent to described second counting module counting after constant-temperature crystal oscillator frequency process of frequency multiplication, the count value that described data processing module reads described second counting module calculates error measuring value and the feedback voltage of crystal oscillator unit interval, the feedback voltage level calculated is sent to described D/A converter module and is converted into analog signal and the feedback voltage interface feeding back to described constant-temperature crystal oscillator after amplifying process by operational amplification circuit.

Wherein more preferably, also comprise: the logical circuit of process pulse per second (PPS);

Described logical circuit comprises: two inputs input or door with door, two;

Described two inputs are connected with described GPS receiver module with the first input end of door, described two input and be connected with the 2nd GPIO interface of described processing unit with the second input of door, described two inputs and the output of door input with described two or the first input end of door is connected, described two inputs input with second of door and are connected with a GPIO interface of described processing unit, and two inputs or the output of door are connected with the INT interface of described processing unit.

The gps time synchronizer for large power, electrically magnetic transmitter that the utility model provides, can generate the pulse per second (PPS) of continuous print high accuracy and remain accurately synchronous reliably, achieve split-second precision signal and export.Even if when gps signal occurs abnormal, synchronizer self also can produce continuous print PPS and ensure the synchronous of gps time.Under strong electromagnetic, no matter whether gps signal is normal, quite high precision and reliability can be kept, gps time synchronizer to sum up designed by this paper is applicable in electromagnetic survey, and the occasion that electric power, communication, computer network etc. need high accuracy real-time synchronization can be widely used in, therefore have great application prospect.

Accompanying drawing explanation

Fig. 1 is the utility model gps time synchronizer system configuration schematic diagram;

Fig. 2 is pulse per second (PPS) and the serial data waveform schematic diagram of GPS module output;

Fig. 3 is that GPS module exports complete serial data waveform schematic diagram;

Fig. 4 is pulse per second (PPS) logical circuit and DSP connection diagram;

Fig. 5 is pps pulse per second signal generating principle schematic diagram;

Fig. 6 is the waveform schematic diagram that the disturbed pps pulse per second signal of pulse per second (PPS) is not lost;

Fig. 7 is the waveform schematic diagram that the disturbed pps pulse per second signal of pulse per second (PPS) is lost;

Fig. 8 is constant-temperature crystal oscillator feedback control circuit circuit diagram;

Fig. 9 is the pulse per second (PPS) waveform schematic diagram after logical circuit process.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but are not used for limiting scope of the present utility model.

As shown in Figure 1, the utility model provides a kind of gps time synchronizer for large power, electrically magnetic transmitter (hereinafter referred to as gps time synchronizer), comprising: GPS receiver module, main control unit; GPS receiver module and main control unit communicate to connect; GPS receiver module catches gps satellite signal, and by gps satellite signal conversion process, GPS receiver module exports the gps data after conversion to main control unit, and the time signal obtaining standard after main control unit decoding gps data transfers to host computer display.Detailed description is launched to the utility model below.

Due to gps satellite signal propagate in space time, be subject to the impact of external environment, if run into barrier, its signal power can weaken or disappear, the seizure of receiving chip to satellite-signal will be had influence on, so should manage to improve the ability that synchronizer captures gps satellite signal.There is employed herein following two kinds to improve one's methods: on the one hand, gps antenna is put into open area of not blocking, to reduce weak to satellite-signal power of barrier; On the other hand, increase the radio frequency supply voltage (such as, being increased to 5V by 3.3V) of GPS receiving chip, improve receiving chip to the receiving ability of satellite-signal.If still complete gps signal can not be received after above-mentioned two kinds of mode process, need, after gps signal is lost, by other means for system provides gps time synchronizer to provide temporal information, to guarantee that system exports high-precision time signal.In an embodiment of the present utility model, the Wi125 of CONNOR-WINFIELD company of the GPS receiver module preferred U.S..Wi125GPS receiver module time precision reaches 25ns.GPS receiver module exports the serial data (NMEA-0183 statement) shown in pulse per second (PPS) PPS (pulses per second) and Fig. 3 as shown in Figure 2 by directly distinguishing after gps satellite signal conversion process, wherein contains gps time information and locating information etc. in serial data.Pulse per second (PPS) PPS and serial data are exported by the mouth that GPS receiver module two is different.

As shown in Figure 1, in order to avoid after gps signal is lost, gps time synchronizer can not export high-precision time signal.For avoiding this problem, the gps time synchronizer that the utility model provides also is provided with counting unit, and counting unit and main control unit communicate to connect; Counting unit provides continuous print constant-temperature crystal oscillator frequency to main control unit, and main control unit transfers to host computer to the time signal that the gps data after changing with GPS module after constant-temperature crystal oscillator frequency processing synchronously obtains standard and shows.This gps time synchronizer can generate continuous print High Accuracy Constant Temperature crystal oscillator frequency by counting unit and remain accurately synchronous reliably.In an embodiment of the present utility model, in gps time synchronizer, counting unit preferably selects constant-temperature crystal oscillator, and the precision of pulse per second (PPS) depends on the precision of constant-temperature crystal oscillator.Constant-temperature crystal oscillator optimized frequency is the constant-temperature crystal oscillator of 12.288M.Frequency is that the constant-temperature crystal oscillator frequency accuracy of 12.288M reaches 9 orders of magnitude after decimal point, and frequency short-term stability is better than 2E-11 (2E-11=2*10 ^-11the frequency short-term stability of the constant-temperature crystal oscillator of 12.288M to reach after decimal point 11, precision comparison is high), day ageing rate <=± 0.5ppb, and with feedback regulation, make it have very high frequency accuracy and stability, these advantages make this device substantially increase synchronization accuracy, temperature stability and time stability than the device of use common crystals.

As shown in Figure 1, main control unit comprises control unit FPGA (Field-Programmable Gate Array, field programmable gate array) and processing unit DSP (digital signal processor, digital signal processor), control unit is connected by address, data bus communication with processing unit.Control unit and processing unit transmit data in parallel form by address, data/address bus.GPS receiver module exports the gps data after conversion to processing unit, and processing unit is respectively by different interface gps datas (such as, pulse per second (PPS) and serial data receive external interrupt mouth and the RXD mouth of processing unit DSP respectively).Processing unit, to the serial data demodulation received, the time data that is processed into standard, transfers to host computer display.The constant-temperature crystal oscillator frequency that control unit count pick up unit sends, and count after its frequency multiplication, and the count signal after counting is transferred to processing unit, count signal is synchronously processed into time signal and shows to host computer with the time tranfer that gps time data syn-chronization forms standard by processing unit.This gps time synchronizer produces high-precision pulse per second (PPS) by counting unit, finally makes gps time synchronizer self produce high-precision pulse per second (PPS), to the time synchronized after pulse per second (PPS) process and in gps data, guarantees to export high-precision time signal.

In an embodiment of the present utility model, processing unit comprises: a URAT module, GPS decoder module, time synchronized module, the 2nd URAT module, data processing module, external interrupt module.One URAT module, GPS decoder module, time synchronized module, the 2nd URAT module sequentially communicate to connect, and data processing module, interrupt module, time synchronized module sequentially communicate to connect.After one URAT module receives the gps data of GPS receiver module transmission, be forwarded to GPS decoder module, gps data is decoded into current time by GPS decoder module, state information is sent to time synchronized module, temporal information, state information are processed into the UTC time (universal time) and are sent to the 2nd URAT module by time synchronized module, and the UTC time is sent to display module by the 2nd URAT module.Data processing module receives the count value of control module transmission and changes into pps pulse per second signal and transfer to external interrupt module, pps pulse per second signal is processed into the unit interval (such as one second being interval interrupt) and transfers to time synchronized module by external interrupt module, time synchronized module synchronization unit interval and current time form the UTC time (universal time) and are sent to the 2nd URAT module, and the UTC time is sent to display module by the 2nd URAT module.Comprise the UTC time of current time in the serial data that GPS chip sends to DSP, and pulse per second (PPS) often triggers an external interrupt, the corresponding UTC time just adds 1s.The TMS320F2812 of the preferred TI company of processing unit DSP, dominant frequency reaches 150MHz, and the major part instruction cycle is 6.67ns, data processing speed is fast, simultaneously Embedded powerful I/O mouth and many peripheral functionality.TMS320F2812 has abundant time manager, and SCI (Serial Communication Interface, serial communication interface) module and interrupt module are that the design of this device provides a great convenience.

In an embodiment of the present utility model, control unit comprises: times frequency module, the first counting module, data buffer area.Times frequency module, the first counting module, data buffer area sequentially communicate to connect.Deliver in the first counting module after times frequency process of frequency multiplication that counting unit is transmitted by frequency module and count, after the count value in the first counting module reaches set point, then count value is delivered to data buffer area, wait for the reading of DSP.The data buffer zone of FPGA is equivalent to an external memory storage of DSP, when DSP reads data from FPGA and sends control command to FPGA, needs for each data allocations address.Control unit FPGA has selected the Cyclone II Series FPGA device of altera corp, himself clock frequency can reach hundreds of megahertz, add the characteristic of parallel processing, very high processing speed can be reached, be applicable to very much being applied to the real-time system that time precision has higher requirements.

Because gps satellite signal is when spatial, Signal transmissions is often subject to the many-side restriction of environmental condition, and the phenomenon such as multipath and interference is more serious.The gps data that particularly it exports under strong electromagnetic environment can be mingled with disturbing signal, likely causes PPS to lose efficacy.In order to avoid this gps time synchronizer receives the not high and poor reliability of temporal information precision that interference causes exporting, need to consider that gps time synchronizer is under strong electromagnetic environment, GPS receiver module is likely mingled with the problem of interference when transmitting PPS, likely occur the situation of jump second.Realizing signal accurately for ensureing that this gps time synchronizer exports, must manage to eliminate PPS pulse per second (PPS) interference, avoiding the appearance of jump second phenomenon.In addition, utility model people repeatedly studies and finds that DSP directly can not process the pulse per second (PPS) that GPS chip produces, and after needing to process pulse per second (PPS), then transfers to DSP process.As shown in Figure 1, in order to avoid electromagnetic interference is to PPS pulse per second (PPS) interference, better makes DSP to pulse per second (PPS) process, improve the precision of output time.This gps time synchronizer also comprises: the logical circuit of process pulse per second (PPS).As shown in Figure 1, logical circuit is connected between GPS receiver module and main control unit.As shown in Figure 4, logical circuit comprises two inputs and door, two inputs or door, two inputs are connected with GPS receiver module with the first input end of door, two to input and the second input of door and the 2nd GPIO (the General Purpose Input Output of DSP, universal input/output) interface connection, two inputs and the output of door input with two or the first input end of door is connected, two inputs input with second of door and are connected with a GPIO interface of DSP, and two inputs or the output of door are connected with the INT interface of DSP.

Fig. 5 shows logical circuit to the pps pulse per second signal generating principle after pps pulse per second signal process.As shown in Figure 4 and Figure 5, in this gps time synchronizer, the mode of operation of logical circuit is mainly divided into three kinds; The first, gps signal is not disturbed; The second, gps signal is disturbed, and pps pulse per second signal is not lost; Three, gps signal is disturbed, and pps pulse per second signal is also lost.Below in this gps time synchronizer, the mode of operation of logical circuit describes in detail.

First mode of operation, gps signal not disturbed (i.e. 0-3s in Fig. 5): signal 1 is the pps pulse per second signal that gps time synchronizer self produces, and signal 1 is that control unit FPGA counts to get after constant-temperature crystal oscillator frequency multiplication.When gps signal is not disturbed, signal 1 using in advance GPS pulse per second (PPS) t/2 time as initial time (during 0s signal 1 and GPS_PPS synchronous, signal 1 first time timing (1-t/2) s, afterwards all timing 1s).Because the FPGA own operative frequency selected can reach hundreds of megahertz, therefore FPGA time counted once after by constant-temperature crystal oscillator frequency multiplication is only a few nanosecond, so when guaranteeing output signal 1, very short (being less than 1us) that also time t can be set, guarantee that the pps pulse per second signal 1 that synchronizer self produces and GPS receiver module provide pps pulse per second signal time deviation very little like this.When gps signal is not disturbed, input signal is after logical circuit, the signal 4 exported and GPS_PPS (GPS pulse per second (PPS)) are synchronous, so also just ensure that GPS_PPS is delivered in the external interrupt module of DSP accurately, through the process of the time synchronized module of DSP, system just can export correct time signal.

Second mode of operation, gps signal is disturbed, and pps pulse per second signal is not lost (i.e. 3-4s in Fig. 5): as shown in Figure 6, when gps signal is disturbed but pulse per second (PPS) is not also lost, because signal 1 is only in the both sides of GPS pulse per second (PPS) rising edge, and waveform very narrow.So signal 1 and GPS_PPS through with behind the door, as long as gps signal is normal, GPS pulse per second (PPS) just can smoothly by with door, and impulse disturbances outside signal 1 burst pulse will conductively-closed, due to width very little of burst pulse, so this logical circuit can well eliminate disturbing pulse.

3rd mode of operation, gps signal is not disturbed, pps pulse per second signal is also lost (i.e. 4-5s in Fig. 5): as shown in Figure 7, disturbed at gps signal, when pps pulse per second signal is also lost, the pps pulse per second signal 1 that gps time synchronizer self produces replaces gps signal to provide pulse per second (PPS) to export.If it is low level that data processing module monitors 5s place signal 1 signal 2 between whole high period in Fig. 5 always, now can judge that GPS pps pulse per second signal is lost.After data processing module receives the count value of counting module 1, generate signal 1 at once, and counting clearing command is sent to FPGA counting module 1, when detecting that gps signal is abnormal (GPS pulse per second (PPS) loss), generate signal 3, give signal 3 one pulse signals at once, signal 3 and signal 2 through or behind the door, signal 4 obtains a pulse signal (pps pulse per second signal of namely gps time synchronizer self generation), this pps pulse per second signal is compared actual GPS_PPS and is delayed the t/2 time, due to time t very short, so the pps pulse per second signal that produces of device self and GPS receiver module provide pps pulse per second signal also with regard to no significant difference.

Through above-mentioned process, even if device loses gps signal also can not lose the pulse per second (PPS) needed for normally working, until GPS pps pulse per second signal recover normal after operate being switched to mode of operation 1, this synchronizer had both considered GPS and lock-out pulse may have been caused to disappear due to external interference, prevented again mutation disturbance signal to be mistaken as the generation of synchronizing signal phenomenon.GPS pulse per second (PPS) (Fig. 6 and Fig. 7) disturbed under strong electromagnetic environment obtains pulse per second (PPS) oscillogram as shown in Figure 9 after logical circuit process.As can be seen from Figure 9, the disturbing signal that in Fig. 6, pulse per second (PPS) is mingled with after logical circuit process is eliminated, and there is not the phenomenon of jump second, the pps pulse per second signal lost in Fig. 7 produces synchronous pulse signal by synchronizer self after logical circuit process, guarantees that system exports high-precision lock in time.Whether the gps time synchronizer that the utility model provides, by arranging logical circuit, no matter with or without gps signal, receives electromagnetic interference, can ensure the precision exporting pulse.

Although the constant-temperature crystal oscillator precision height very selected, the error of unit interval is more stable.Gps time synchronizer uses constant-temperature crystal oscillator to make self to produce high-precision pulse per second (PPS), and still there are certain cumulative errors, add aging factor, after Long-Time Service, rate-adaptive pacemaker has skew.In order to ensure the precision of the time signal that this gps time synchronizer exports further, the error measure of crystal oscillator unit interval is needed to estimate, utilize crystal oscillator can the characteristic (constant-temperature crystal oscillator carry Voltage Feedback control pin) of feedback regulation, realize the closed-loop control to constant-temperature crystal oscillator frequency.

As shown in Figure 1, in order to estimate and eliminate the error of crystal oscillator unit interval better, this gps time synchronizer also comprises constant-temperature crystal oscillator feedback control circuit, and constant-temperature crystal oscillator feedback control circuit is arranged between main control unit and constant-temperature crystal oscillator.As shown in Figure 8, constant-temperature crystal oscillator feedback control circuit comprises: the second counting module, D/A converter module, operational amplification circuit.Times frequency module, the second counting module, data processing module, D/A converter module, operational amplification circuit constant-temperature crystal oscillator sequentially communicate to connect.Times frequency module will be sent to the second counting module counting after constant-temperature crystal oscillator frequency process of frequency multiplication, the count value that data processing module reads the second counting module calculates error measuring value and the feedback voltage of crystal oscillator unit interval, the feedback voltage level of computing place is sent to D/A converter module and is converted into analog signal, by analog signal by feeding back to the feedback voltage mouth of constant-temperature crystal oscillator after the process of operational amplification circuit method.In an embodiment of the present utility model, utilize FPGA can the characteristic of parallel processing, then add road counter second counting module.Second counting module is connected with the spare unit module communication of FPGA, and the second counting module is connected with the data processing module of DSP.In second counting module calculating adjacent 2 GPS pulse per second (PPS) times, FPGA is to the constant-temperature crystal oscillator frequency count after frequency multiplication.Second data processing module FPGA in adjacent for counting module 2 GPS pulse per second (PPS) times being sent to DSP to the constant-temperature crystal oscillator frequency count after frequency multiplication.The error measuring value of the crystal oscillator unit interval after frequency multiplication calculates and completes in dsp, according to the oscillator frequency deviation value calculated, calculates feedback voltage, realizes the closed-loop control to constant-temperature crystal oscillator frequency, so also just can revise the frequency of constant-temperature crystal oscillator.

When gps signal is normal, be very accurately during the pps pulse per second signal that GPS chip produces, so counting module 2 gate time is chosen between two adjacent pulse per second (PPS)s.After first time GPS pulse per second (PPS) triggers DSP external interrupt, the data processing module of DSP gives FPGA counting module 2 clear command at once, counting module 2 starts the counting of the crystal oscillator frequency after to frequency multiplication, after second time down trigger, first the count value of counting module 2 is read, and preserve, then FPGA counting module 2 clear command is given, start to count next time, then after next triggered interrupts, repeat the operation that second time enters external interrupt.Due to after GPS pulse per second (PPS) is lost, pulse per second (PPS) is produced by synchronizer self, so the value of 1s inside counting module 1 and 2 is equal, so no longer carry out correction work to constant-temperature crystal oscillator, after GPS pps pulse per second signal recovers, then carries out correction work to crystal oscillator frequency.When gps signal is normal, counting module 2 works, and after GPS pps pulse per second signal is lost, counting module 2 quits work.

In sum, the gps time synchronizer for large power, electrically magnetic transmitter that the utility model provides, can generate the pulse per second (PPS) of continuous print high accuracy and remain accurately synchronous reliably, achieve split-second precision signal and export.Even if when gps signal occurs abnormal, synchronizer self also can produce continuous print PPS and ensure the synchronous of gps time.Under strong electromagnetic, no matter whether gps signal is normal, quite high precision and reliability can be kept, gps time synchronizer to sum up designed by this paper is applicable in electromagnetic survey, and the occasion that electric power, communication, computer network etc. need high accuracy real-time synchronization can be widely used in, therefore have great application prospect.

Above execution mode is only for illustration of the utility model; and be not limitation of the utility model; the those of ordinary skill of relevant technical field; when not departing from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.

Claims (7)

1. for a gps time synchronizer for large power, electrically magnetic transmitter, it is characterized in that, comprising: GPS receiver module, main control unit;

Described GPS receiver module communicates to connect with main control unit respectively;

Described GPS receiver module catches gps satellite signal, and by gps satellite signal conversion process, described GPS receiver module exports the data after conversion to described main control unit, and the time signal obtaining standard after described main control unit decoding transfers to host computer display

Also comprise counting unit, described counting module and described main control unit communicate to connect;

Described counting unit provides continuous print frequency signal to described main control unit, and described main control unit transfers to described host computer to the time signal obtaining standard after the data syn-chronization after changing with GPS module after frequency signal process and shows.

2. gps time synchronizer as claimed in claim 1, it is characterized in that, described main control unit comprises: main control unit comprises control unit and processing unit;

Described control unit is connected by bus communication with described processing unit;

Described GPS receiver module exports the gps data after conversion to described processing unit, and after described processing unit demodulation, process gps data, the time signal of outputting standard is to described host computer display;

Count after the frequency frequency multiplication that described main control unit exports described counting unit, and count signal is transferred to described processing unit, described processing module is incited somebody to action and count signal is converted to pps pulse per second signal, and the time signal obtaining standard after the data syn-chronization after changing pps pulse per second signal and GPS module transfers to described host computer and shows.

3. gps time synchronizer as claimed in claim 2, it is characterized in that, described control unit is FPGA and processing unit DSP.

4. gps time synchronizer as claimed in claim 2, it is characterized in that, described processing unit comprises: a URAT module, GPS decoder module, time synchronized module, the 2nd URAT module, data processing module, external interrupt module;

A described URAT module, described GPS decoder module, described time synchronized module, described 2nd URAT module sequentially communicate to connect, and described data processing module, described interrupt module, described time synchronized module sequentially communicate to connect;

After one URAT module receives the gps data of described GPS receiver module transmission, be forwarded to described GPS decoder module, gps data is decoded into the time by described GPS decoder module, state information is sent to described time synchronized module, and temporal information, state information are processed into the standard time and are sent to host computer by described 2nd URAT module by described time synchronized module;

Described data processing module receives the count information of control module or the transmission of GPRS receiver module and changes into pps pulse per second signal, and pps pulse per second signal is transferred to described external interrupt module, pps pulse per second signal is converted to time signal and transfers to described time synchronized module by described external interrupt module, and the time signal of time signal and the transmission of GPRS receiver module is processed into the standard time and is sent to host computer by described 2nd URAT module by described time synchronized module.

5. gps time synchronizer as claimed in claim 2, it is characterized in that, described control unit comprises: times frequency module, the first counting module, data buffer area;

Described times of frequency module, described first counting module, described data buffer area sequentially communicate to connect;

Deliver in described first counting module after the frequency process of frequency multiplication that counting unit is transmitted by described times of frequency module and count, after the count value in described first counting module reaches set point, then count value is delivered to described data buffer area.

6. gps time synchronizer as claimed in claim 5, is characterized in that, also comprise constant-temperature crystal oscillator feedback control circuit;

Described constant-temperature crystal oscillator feedback control circuit comprises: the second counting module, D/A converter module, operational amplification circuit;

Described times of frequency module, described second counting module, described data processing module, described D/A converter module, described operational amplification circuit, described constant-temperature crystal oscillator sequentially communicate to connect;

Described times of frequency module will be sent to described second counting module counting after constant-temperature crystal oscillator frequency process of frequency multiplication, the count value that described data processing module reads described second counting module calculates error measuring value and the feedback voltage of crystal oscillator unit interval, the feedback voltage level calculated is sent to described D/A converter module and is converted into analog signal and the feedback voltage interface feeding back to described constant-temperature crystal oscillator after amplifying process by operational amplification circuit.

7. gps time synchronizer as claimed in claim 2, is characterized in that, also comprise: the logical circuit of process pulse per second (PPS);

Described logical circuit comprises: two inputs input or door with door, two;

Described two inputs are connected with described GPS receiver module with the first input end of door, described two input and be connected with the 2nd GPIO interface of described processing unit with the second input of door, described two inputs and the output of door input with described two or the first input end of door is connected, described two inputs input with second of door and are connected with a GPIO interface of described processing unit, and two inputs or the output of door are connected with the INT interface of described processing unit.