CN100520301C

CN100520301C - Frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device

Info

Publication number: CN100520301C
Application number: CNB2007100357979A
Authority: CN
Inventors: 付国红; 何继善; 熊彬; 佟铁钢
Original assignee: JISHAN HIGH TECH Co Ltd HUNAN PROV
Current assignee: JISHAN HIGH TECH Co Ltd HUNAN PROV
Priority date: 2007-09-24
Filing date: 2007-09-24
Publication date: 2009-07-29
Anticipated expiration: 2027-09-24
Also published as: CN101178315A

Abstract

The invention discloses a GPS precise synchronizing chopping isolator for frequency-domain electrical instrument. A GPS antenna is connected with a GPS punctual module U1. A GPS receiving module and a homothermal crystal oscillator OCXO are arranged in the GPS punctual module U1. A GPS punctual module is connected with a wave shape forming module U2. The last stage driving signal generated by the wave shape forming module U2 is connected with the input end of a bridge type power switch of an isolating drive circuit arranged in a transmitting set. The wave shape forming module U2 in a chopping receiver is connected with an isolating chopping module U3. An isolating chopping module U2 is connected with an SCM management module U4. An electric switch in the internal part of the isolating chopping module is controlled by a chopping pulse to generate a switch single coincident with the chopping pulse. The electric switch is inserted into the position behind an industry frequency filtering in the signal channel of an electrical receiver and carries through synchronizing chopping after preamplification and industry frequency filtering. The invention can eliminate the harmful effect on the measuring result caused by electromagnetic coupling effect simultaneously when measuring and need no additional workload, thereby avoiding the inconvenience and defect when remedying software.

Description

A kind of frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device

Technical field

The present invention relates to a kind of frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device.

Background technology

Ubiquity electromagnetic coupling effect in frequency field electrical method apparatus measures, it is the serious interference in measuring, the means that are based at present data processing are carried out more both at home and abroad, its electromagnetic coupled correcting scheme has calibration result preferably in the more weak fashion of electromagnetic coupled, when electromagnetic coupling effect strengthened, calibration result was generally relatively poor.Some decoupling methods so not only need to increase the field work amount, and are difficult to adapt to open-air complicated earth electric field working environment.

Summary of the invention

The objective of the invention is to overcome the shortcoming that software is proofreaied and correct, provide a kind of hardware that when measuring, adopts to realize the technical method of copped wave decoupling, no matter electromagnetic coupling effect strong or a little less than, a kind of frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device of better calibration result can both be arranged.

Technical scheme of the present invention is: comprise gps antenna, the GPS module U1 that keeps time, waveform forms module U2, isolate copped wave module U3, the bridge switch module, single-chip microcomputer administration module U4, described gps antenna is connected with the punctual module U1 of GPS, built-in GPS receiver module and constant-temperature crystal oscillator OCXO among the punctual module U1 of GPS, the punctual module of GPS forms module U2 with waveform and links to each other, in the copped wave transmitter, the final stage drive signal that waveform forms module U2 generation is connected with the input end of the bridge-type power switch of the built-in isolated drive circuit of transmitter, convert high voltage direct current to rectangle electric current that electrical method instrument transmitter is exported through bridge switching circuit, power to the earth; Waveform in the copped wave receiver forms module U2 and links to each other with isolation copped wave module U3, isolating copped wave module U2 is connected with single-chip microcomputer administration module U4, the electronic switch of isolating the copped wave inside modules, controlled by the copped wave pulse, produce the switching signal consistent with the copped wave pulse, this electronic switch is inserted into the power frequency filtering position afterwards in the electrical method receiver signal passage, carries out synchronous copped wave after preposition amplification, power frequency filtering.

GPS demoder built-in in the described GPS receiver module produces UTC time signal and 1PPS clock signal second, the 1PPS signal is imported single-chip microcomputer administration module and programming device respectively, the counter of design is counted frequency division to the oscillator signal of constant temperature crystal output in the programming device, and compare with the 1PPS signal of GPS module output, its error signal is an error voltage through digital-to-analog conversion, be added in the voltage-controlled end of constant temperature crystal, fine setting constant temperature crystal oscillation frequency is eliminated the issuable cumulative errors of constant temperature crystal.

1 pin of the punctual module of described GPS links to each other with gps antenna, and 5,6,7 pin of U1 are connected with 3,2,1 pin of waveform formation module U2 respectively, and 8 pin connect power supply.

12 pin that described waveform forms module U2 produce receiver copped wave pulse signal, the frequency of copped wave pulse signal is set by the level of 9,10 pin of U2, the selection of copped wave pulse width is set by the level of 5,6,7 pin of U2,2,3,4 pin of single-chip microcomputer administration module U4 link to each other with 5,6,7 pin of U2 respectively, be used to set the width of the copped wave pulse that U2 produces, 5,6 pin of U4 link to each other with 9,10 pin of U2 respectively, are used to set the drive signal of U2 generation and the frequency of chopping signal.

2,3 pin of described isolation copped wave module U3 form electric the linking to each other of 12,11 pin of module respectively with the waveform of receiver, 1,4 pin are unsettled, 5 pin are optocoupler output stage earth terminal, 8 pin are optocoupler output stage power input, electronic switch between inside 6,7 pin of U3 is controlled by the copped wave pulse of the 2 pin input of U3, when the 2 pin input high levels of U3, the electronic switch between 6,7 pin is in off-state, otherwise is in conducting state.

Described single-chip microcomputer administration

module U4 sets

5,6,7,9,10 operation level when work, select suitable frequency of operation and copped wave width.

The present invention adopts second clock of the punctual module output of the GPS with punctual function as synchronous base, and synchronous speed is fast, precision is high, does not need manual calibration; Adopt the hardware divider technology to form transmitter drive signal and synchronous receiver copped wave pulse, copped wave is accurate synchronously, and the copped wave pulse is very stable; Isolate the copped wave module and avoided the interference of chopper circuit, isolate that the copped wave module is built-inly highly isolated, the electronic switch of low conduction impedance avoided inserting behind the electronic switch influence to the instrument receiver the instrument receiver.This technical method that carries out the copped wave decoupling with hardware can be eliminated the harmful effect of electromagnetic coupling effect to measurement result when measuring, not needing additionally increases workload, and has avoided the inconvenient and not enough of software timing.

Description of drawings

Fig. 1 is the block diagram of system;

Fig. 2 is the punctual module U1 synoptic diagram of GPS;

Fig. 3 waveform forms module U2 synoptic diagram;

Fig. 4 is for isolating copped wave module U3 synoptic diagram;

Fig. 5 is last stage of transmitter drive signal and the synchronous chopping switch signaling module of receiver connection layout;

Fig. 6 is a copped wave last stage of transmitter block diagram;

Fig. 7 is a chopper insertion position block scheme.

Embodiment

With reference to Fig. 1:

Gps antenna is connected with the punctual module U1 of GPS, built-in GPS receiver module and constant-temperature crystal oscillator OCXO among the punctual module U1 of GPS, the punctual module of GPS forms module U2 with waveform and links to each other, in the copped wave transmitter, the final stage drive signal that waveform forms module U2 generation is connected with the input end of the bridge-type power switch of the built-in isolated drive circuit of transmitter, convert high voltage direct current to rectangle electric current that electrical method instrument transmitter is exported through bridge switching circuit, power to the earth; Waveform in the copped wave receiver forms module U2 and links to each other with isolation copped wave module U3, the electronic switch of isolating the copped wave inside modules, controlled by the copped wave pulse, produce the switching signal consistent with the copped wave pulse, this electronic switch is inserted into the power frequency filtering position afterwards in the electrical method receiver signal passage, carries out synchronous copped wave after preposition amplification, power frequency filtering.

With reference to Fig. 2: wherein A is the punctual module pinouts of GPS, and B be inner composition block scheme:

GPS demoder built-in in the GPS receiver module produces UTC time signal and 1PPS clock signal second, the 1PPS signal is imported single-chip microcomputer administration module and programming device respectively, the counter of design is counted frequency division to the oscillator signal of constant temperature crystal output in the programming device, and compare with the 1PPS signal of GPS module output, its error signal is an error voltage through digital-to-analog conversion, be added in the voltage-controlled end of constant temperature crystal, fine setting constant temperature crystal oscillation frequency is eliminated the issuable cumulative errors of constant temperature crystal.

With reference to Fig. 3: wherein A is this module pinouts, and B is the inside modules circuit theory diagrams;

12,11 pin of U2 link to each other with 2,3 pin of U3 respectively.1 pin is the pulse per second (PPS) input pin, and 3 pin are constant temperature crystal oscillator signal input pin, and 4 pin are empty pin, 2,8,11,13 pin ground connection, and 16 pin connect power supply, and 12 pin are the chopping signal output terminal, and 14,15 is last stage of transmitter drive signal output terminal.

Waveform forms the special chip of module U2 for design, be mainly used in and produce and the synchronous transmitter drive signal of 1PPS pulse per second (PPS), receiver copped wave pulse signal, transmitter, receiver has 4 kinds of different frequency of operation selective, during work by 9 of U2,10 pin level are set, receiver copped wave pulse width has 8 kinds of different copped wave the Width options, by 5 of U2,6,7 pin level are set, during work, be provided with 5 by one-chip computer module, 6,7,9,10 pin level, be used to select corresponding transmitter, operation of receiver frequency and receiver copped wave width require transmitter consistent with the operation of receiver frequency.

With reference to Fig. 4: wherein A is this module pinouts, and B is the inside modules circuit theory diagrams;

2,3 pin of U3 form electric the linking to each other of 12,11 pin of module respectively with the waveform of receiver, 1,4 pin are unsettled, 5 pin are optocoupler output stage earth terminal, 8 pin are optocoupler output stage power input, when 2 pin of U3 are low level, be in conducting state between 6,7 pin of U3 (being SIG_OUT, SIG_IN pin), impedance is very low; When 2 pin were high level (be copped wave pulse arrive), 6, the 7 pin inside of U3 were in open-circuit condition, and signal can't be sent to next stage, removed thereby this part signal cut.

With reference to Fig. 5: (1) is copped wave last stage of transmitter drive signal generator among the figure, and (2) are copped wave receiver chopping switch signal generators.

5,6,7 pins of U2 link to each other with 2,3,4 pin of single-chip microcomputer administration module U4 respectively, are used to set the width of the copped wave pulse that U2 produces.9,10 pins of U2 link to each other with 5,6 pin of U4 respectively, are used to set the drive signal of U2 generation and the frequency of chopping signal.12 pin of U2 produce receiver copped wave pulse signal, the frequency of copped wave pulse signal is by 9 of U2, the level of 10 pin is set, the selection of copped wave pulse width is by 5 of U2,6, the level of 7 pin is set, the copped wave pulse signal is through the isolation drive of isolation drive module U3, the inside 6 of U3, electronic switch between 7 pin is controlled by the copped wave pulse of the 2 pin input of U3, when the 2 pin input high levels (copped wave pulse arrival) of U3,6, electronic switch between 7 pin is in off-state, otherwise be in conducting state, single-chip microcomputer administration module (U4) sets 5 when work, 6,7,9,10 operation level is selected suitable frequency of operation and copped wave width.

The module connection layout that produces the last stage of transmitter synchronized signal only need remove the U3 module and get final product.The frequency of final stage synchronized signal is set by 9, the 10 pin level of U2, synchronized signal outputs to the last stage of transmitter circuit through 15,14 pins of U2, single-chip microcomputer administration module (U4) is set 9,10 operation level when work, selected frequency of operation should be consistent with receiver.

With reference to the drive signal (WAV A, WAV B) of Fig. 6: the U2 output isolation drive through the bridge switch inside modules, the control bridge switch converts high voltage direct current to corresponding rectangle electric current the earth is powered.

With reference to Fig. 7: among the figure SIG_IN, SIG_OUT respectively with isolate copped

wave module

7,6 pin in electronic switch link to each other, be subjected to chopping switch through preposition amplification and the filtered earth electric field signal of power frequency and control.When not having the copped wave pulse, the electronic switch conducting; When the copped wave pulse arrived, electronic switch disconnected, and reached the purpose of copped wave.

Claims

1. frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device, it is characterized in that comprising gps antenna, the GPS module U1 that keeps time, waveform forms module U2, isolate copped wave module U3, the bridge switch module, single-chip microcomputer administration module U4, described gps antenna is connected with the punctual module U1 of GPS, built-in GPS receiver module and constant-temperature crystal oscillator OCXO among the punctual module U1 of GPS, the punctual module of GPS forms module U2 with waveform and links to each other, in the copped wave transmitter, the final stage drive signal that waveform forms module U2 generation is connected with the input end of the bridge-type power switch of the built-in isolated drive circuit of transmitter, convert high voltage direct current to rectangle electric current that electrical method instrument transmitter is exported through bridge switching circuit, power to the earth; Waveform in the copped wave receiver forms module U2 and links to each other with isolation copped wave module U3, isolating copped wave module U3 is connected with single-chip microcomputer administration module U4, the electronic switch of isolating the copped wave inside modules, controlled by the copped wave pulse, produce the switching signal consistent with the copped wave pulse, this electronic switch is inserted into the power frequency filtering position afterwards in the electrical method receiver signal passage, carries out synchronous copped wave after preposition amplification, power frequency filtering.

2. frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device according to claim 1, it is characterized in that GPS demoder built-in in the described GPS receiver module produces UTC time signal and 1PPS clock signal second, the 1PPS signal is imported single-chip microcomputer administration module and programming device respectively, the counter of design is counted frequency division to the oscillator signal of constant temperature crystal output in the programming device, and compare with the 1PPS signal of GPS module output, its error signal is an error voltage through digital-to-analog conversion, be added in the voltage-controlled end of constant temperature crystal, fine setting constant temperature crystal oscillation frequency is eliminated the issuable cumulative errors of constant temperature crystal.

3. frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device according to claim 1 is characterized in that 1 pin of the punctual module of GPS links to each other with gps antenna, and 5,6,7 pin of U1 are connected with 3,2,1 pin of waveform formation module U2 respectively, and 8 pin connect power supply.

4. frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device according to claim 1, it is characterized in that described waveform forms the 12 pin generation receiver copped wave pulse signal of module U2, the frequency of copped wave pulse signal is by 9 of U2, the level of 10 pin is set, the selection of copped wave pulse width is by 5 of U2,6, the level of 7 pin is set, 2 of single-chip microcomputer administration module U4,3,4 pin respectively with 5 of U2,6,7 pin link to each other, be used to set the width of the copped wave pulse that U2 produces, 5 of U4,6 pin respectively with 9 of U2,10 pin link to each other, and are used to set the drive signal of U2 generation and the frequency of chopping signal.

5. frequency domain electric means instrument GPS precision synchronization chopped wave decoupling device according to claim 1, it is characterized in that 2,3 pin of described isolation copped wave module U3 form electric the linking to each other of 12,11 pin of module respectively with the waveform of receiver, 1,4 pin are unsettled, 5 pin are optocoupler output stage earth terminal, 8 pin are optocoupler output stage power input, electronic switch between inside 6,7 pin of U3 is controlled by the copped wave pulse of the 2 pin input of U3, when copped wave pulse arrival is the 2 pin input high levels of U3,6, the electronic switch between 7 pin is in off-state, otherwise is in conducting state.