CN106527111B - A kind of spread spectrum coding GPS signal synchronization system - Google Patents
A kind of spread spectrum coding GPS signal synchronization system Download PDFInfo
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- G04R—RADIO-CONTROLLED TIME-PIECES
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- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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Abstract
A kind of spread spectrum coding GPS signal synchronization system, include power module (1), GPS antenna system module (2), GPS receiver system module (3), steady crystal oscillator module (4), GPS clock module (5), GPS information extraction module (6), pulse counter module (7), digital display module (8), time computing module (9), data comparison module (10), charactron circuit module (11), setup module synchronization time (12), key control circuit module (13), signal emission module (14), signal receiving module (15), information storage module (16).It utilize GPS extract temporal information, by manually synchronization time is set, it can be achieved that in spread spectrum coding system transmitter system and receiver system extreme duty time synchronization.
Description
Technical field
The present invention relates to a kind of spread spectrum coding GPS signal synchronization systems, in particular to a kind of to lead for geophysical exploration
The spread spectrum coding GPS signal synchronization system in domain.
Background technique
Frequency domain electromagnetic methods exploration is the important component of geophysical exploration technology, in geological prospecting in recent years
It plays an important role.It is according to electromagnetic signal in the penetration depth of underground and the conduction property of underground medium and used
The substantial connection of wave frequency carrys out the distributed architecture of inverting underground medium, thus frequency domain electromagnetic methods need to obtain multiple frequencies
Detection result.
Frequency domain exploration electromagnetic method specifically includes that frequency variation method, odd harmonic method, double frequency current method, magnetotelluric method, anIt is pseudo-
Random sequence method, spread spectrum coding detection method etc..Traditional frequency variation method, odd harmonic method, double frequency current method are due to look-in frequency
Less, the reasons such as low efficiency hardly result in ideal Effect on Detecting；Magnetotelluric method is limited by far field detection；anPseudo-random sequence method
Containing frequency hopping, the discontinuous of stratum depth measurement will cause.
201210214512.9 spread spectrum coding detection method has pseudorandom by spread spectrum coding by the way that transmission is a series of
The signal of characteristic realizes detection to underground medium in conjunction with correlation detection technology, the spread spectrum coded signal of transmission be 0.001Hz~
By the unipolarity or double polarity sine wave or square wave of coding pattern variation between 65535Hz.What spread spectrum coding detection method was sent
Encoded signal has the characteristics that wide frequency range, spectrum information are abundant, spectral fine degree is high, dominant frequency Energy distribution is uniform,
Other frequency domain electromagnetic methods can be overcome to send, and sequence is single, and Energy distribution is uneven, and single observes the problems such as detection efficient is low, and just
String waveform is not easy the useful information of detecting loss.
The signal for containing multiple frequencies in the detection excitation of spread spectrum coding detection method, needs in detection while recording hair
It penetrates signal and receives the waveform of signal, when handling using emitting signal and receiving signal related algorithm, remove extraneous not phase
The interference signal of pass.In order to preferably carry out data processing, stringent time synchronization will be realized to transmitting signal and reception signal
Acquisition, it is necessary to the synchronous trigger module of design time, guarantee spread spectrum coding transmitter system and receiver system emit simultaneously and
Receive signal.Current Time synchronization technique mainly has wired synchronization, quartz lock, radio station synchronization, GPS to synchronize.It is wired same
Step, quartz lock, radio station synchronize etc. that modes are larger by such environmental effects, and synchronization accuracy is lower；GPS method of synchronization synchronic distance
Far, precision is high, and application is relatively broad.But existing GPS simultaneous techniques, which is mainly used between multiple receivers, receives signal
Synchronous, time synchronization requirement is lower, is difficult to apply in the detection system of spread spectrum coding.
Summary of the invention
The purpose of the present invention is overcome the prior art the shortcomings that, propose a kind of spread spectrum coding GPS signal synchronization system.This
Invention can satisfy requirement of the spread spectrum coding detection method to signal and reception signal strict time synchronization is sent.
Present system mainly includes power module, GPS antenna system module, GPS receiver system module, steady crystal oscillator mould
Block, GPS clock module, GPS information extraction module, pulse counter module, digital display module, time computing module, data ratio
It is received compared with module, charactron circuit module, setup module synchronization time, key control circuit module, signal emission module, signal
Module and information storage module.
The power module is used to provide power supply to whole system, connects GPS antenna system module, GPS receiver system
Module, steady crystal oscillator module, GPS clock module, GPS information extraction module, pulse counter module, digital display module, time
Computing module, data comparison module, charactron circuit module, setup module synchronization time, key control circuit module, signal hair
Penetrate the supply port of module, signal receiving module and information storage module.
The GPS antenna system module is for receiving satellite-signal, the output of GPS antenna system module and GPS receiver
The input of system module is connected.GPS receiver system module arranges received signal, and the GPS information of output includes satellite
Information, temporal information, geographical location information etc..There are two output end, an output end and GPS informations for GPS antenna system module
The input of extraction module is connected, and exports GPS information, and another output is connected with the input of pulse count unit, output and GPS
The second pulse signal (1PPS) of synchronizing information.
The pulse count unit is counted and is exported to the pulse signal of input.The output of pulse count unit with
The counting input end of data comparison module is connected.
The steady crystal oscillator module is for generating high-precision clock signal.The output of steady crystal oscillator module and when GPS
The input of clock module is connected.
The GPS clock module carries out frequency dividing adjustment to the clock signal of input for GPS system, exports GPS information
Reading clock signal.The output of GPS clock module is connected with the input end of clock of GPS information extraction module.
The GPS information extraction module is for extracting Coordinated Universal Time(UTC) (the Universal Time contained in GPS information
Coordinated, abbreviation UTC) information, geographical location information etc..There are two input terminals and two outputs for GPS information extraction module
End, an input terminal is information input terminal, is connected with the output end of GPS receiver system module output GPS information, another input
End is input end of clock, is connected with the output of GPS clock module；In two output ends: one is temporal information output end, with number
The current time input terminal of code display module is connected with the current time input terminal of time computing module, exports the UTC letter of extraction
Breath, another output is position output end, is connected with the input terminal of information storage module, exports the geographical location letter of extraction
Breath.
The information storage module is for storing geographical location information, the number of output end and spread spectrum coding detection system
It is connected according to processing function module, exports the geographical location information of storage, is supplied to later data processing.
The key control circuit module controls signal, key control circuit to system incoming level by key switch
The output of module is connected with the input of setup module synchronization time.
Setup module synchronization time is arranged with reference to the Coordinated Universal Time(UTC) signal extracted by the control signal of input
The setting of setting the time input terminal and time computing module of the synchronization time of system trigger, its output and digital display module
Time input terminal is connected.
The digital display module is there are two input terminal, respectively current time input terminal and setting time input terminal,
Digital display module carries out ASCII character adjustment to the time of input, exports the charactron control signal of time.Digital display module
Output be connected with the input of charactron circuit module.
The charactron circuit module shows that current time is synchronous with setting using the signal of input on charactron
Time.
The digital display module is there are two input terminal, respectively current time input terminal and setting time input terminal,
It asks poor to two times, and the difference of synchronization time and current time can be calculated.The output of digital display module and number
It is connected according to the time difference input terminal of comparison module.
There are two input terminals, respectively counting input end and time difference input terminal for the data comparison module.Data ratio
The data inputted compared with module to two input terminals are compared, when the count value of counting input end input is less than time difference input terminal
When the time difference of input, data comparison module output is 0, conversely, data comparison module exports trigger signal.In transmitter system
In system, the output of data comparison module is connected with the triggering of signal emission module input, and when there is trigger signal, signal emits mould
BOB(beginning of block) emits signal；In receiver system, the output of data comparison module is connected with the triggering of signal receiving module input,
When there is trigger signal, signal receiving module starts to acquire signal.
The GPS clock module, GPS information extraction module, pulse counter module, digital display module, time calculate
Module, data comparison module, setup module synchronization time, signal emission module, signal receiving module, information storage module are all equal
It is realized using programmable logic device.
The GPS clock module can adjust the frequency that GPS information reads clock signal according to different GPS systems.
The GPS information extraction module can judge whether GPS system works according to different GPS systems, and whether location data has
Effect, whether the information prefix for inputting GPS information is correct, correctly then extracts UTC time letter according to the arrangement order of GPS data type
Breath and geographical location information.
The specific workflow of present system is as follows:
1) power module is connected first, is powered by each electricity consumption module of electric power source pair of module system；
2) GPS antenna system module receives satellite-signal, and transmits the signal to GPS receiver system module, is connect by GPS
It receives system module to be adjusted information, exports GPS information and give GPS information extraction module, export second pulse signal to pulsimeter
Counting unit；
3) steady crystal oscillator module generates high accurate clock signal, is conveyed to GPS information after the adjustment of GPS clock module and extracts
Reading clock signal of the module as GPS information；
4) the UTC signal extracted is conveyed to time computing module and digital display module by GPS information extraction module, by
It after digital display module carries out data point reuse, is shown on charactron, while GPS information extraction module also believes the geography of extraction
Information storage module is arrived in breath storage, uses for later data processing；
5) setup module synchronization time is arranged same according to the UTC time of numeral method by key control circuit module
The time is walked, and the synchronization time of setting is conveyed to time computing module and digital display module, is carried out by digital display module
After data point reuse, it is shown on charactron；
6) time computing module solves time difference according to calculating the UTC time of input and synchronization time, and by this time
Difference is conveyed to data comparison module；
7) pulse count unit counts the second pulse signal of input, and by count results in data comparison module
It is compared with time difference, when count value is less than time difference, data comparison module attonity；When count value is equal to the time
When difference, data comparison module exports trigger signal；
8) in transmitter system, the trigger signal trigger signal transmitting module of output starts to emit signal；In receiver
In system, the trigger signal trigger signal receiving module of output is started to work, and signal is acquired, and is thereby realized transmitter and is connect
Extreme duty time synchronization between receipts machine.
Spread spectrum coding GPS signal synchronization system of the present invention is, it can be achieved that transmitter system and receiver in spread spectrum coding system
The extreme duty time synchronization of system, it is single to overcome legacy frequencies domain electromagnetic method system synchronizing function, can not achieve transmitting and
Synchronous problem between reception.
Detailed description of the invention
Fig. 1 spread spectrum coding GPS signal synchronous system architecture block diagram of the present invention；
The work flow diagram of Fig. 2 GPS information extraction module of the present invention.
Specific embodiment
Below by taking M-87 GPS signal synchronization system as an example, the present invention is made in conjunction with the drawings and specific embodiments further
Explanation.
Present system mainly includes power module 1, GPS antenna system module 2, and GPS receiver system module 3, steady are brilliant
Shake module 4, GPS clock module 5, GPS information extraction module 6, pulse counter module 7, digital display module 8, time calculating mould
Block 9, data comparison module 10, charactron circuit module 11, setup module synchronization time 12, key control circuit module 13, letter
Number transmitting module 14, signal receiving module 15 and information storage module 16, as shown in Figure 1.
The power module 1 is used to provide power supply, output end and GPS antenna system module to whole system, and GPS connects
Receive system module, steady crystal oscillator module, GPS clock module, GPS information extraction module, pulse counter module, digital-scroll technique mould
Block, time computing module, data comparison module, charactron circuit module, setup module synchronization time, key control circuit mould
The supply port connection of block, signal emission module, signal receiving module and information storage module.
The GPS antenna system module 2 is for receiving satellite-signal.The output of GPS antenna system module 2 connects with GPS
The input for receiving system module 3 is connected.
The GPS receiver system module 3 arranges received signal, the GPS that GPS receiver system module 3 exports
Information includes satellite information, temporal information, geographical location information etc..There are two output ends for GPS receiver system module 3, and one defeated
Outlet is connected with the input of GPS information extraction module 6, exports GPS information；Another output is defeated with pulse count unit 7
Enter connected, the output second pulse signal (1PPS) synchronous with GPS information.
The pulse signal of 7 pairs of the pulse count unit inputs is counted and is exported.The output of pulse count unit 7
It is connected with the counting input end of data comparison module 10.
The steady crystal oscillator module 4 is for generating high-precision clock signal.The output of steady crystal oscillator module 4 and GPS
The input of clock module 5 is connected.
The GPS clock module 5 carries out frequency dividing adjustment to the clock signal of input for specific GPS system, exports
The reading clock signal of GPS information.The output of GPS clock module 5 is connected with the input end of clock of GPS information extraction module 6.
The GPS information extraction module 6 is for extracting the Coordinated Universal Time(UTC) (Universal contained in GPS information
Time Coordinated, abbreviation UTC) information, geographical location information etc..There are two input terminal and two for GPS information extraction module 6
A output end.In two input terminals, one is information input terminal, and the output end of GPS information is exported with GPS receiver system module 3
It is connected, the other is input end of clock, is connected with the output of GPS clock module 5；In two output ends, one is temporal information
Output end exports the UTC information of extraction, with the current time input terminal of digital display module (8) and working as time computing module 9
Preceding time input terminal is connected, the other is position output end, exports the geographical location information of extraction, with information storage module 16
Input terminal is connected.
The information storage module 16 is for storing geographical location information, the output end and spread spectrum of information storage module 16
The data processing function module of encoding detection system is connected, and exports the geographical location information of storage, is supplied to later data processing.
The key control circuit module 13 controls signal to system incoming level by key switch, by key control electricity
The output of road module 13 is connected with the input of setup module synchronization time 12.
Described setup module synchronization time 12 is set with reference to the Coordinated Universal Time(UTC) signal extracted by the control signal of input
Set the synchronization time of system trigger.Synchronization time, the output of setup module 12 was defeated with the setting time of digital display module 9 respectively
Enter end to be connected with the setting time input terminal of time computing module 9.
There are two input terminals, respectively current time input terminal and setting time input terminal for digital display module 8.Number is aobvious
Show that module 8 by carrying out ASCII character adjustment to the time of input, exports the charactron control signal of time.Digital display module 8
Output be connected with the input of charactron circuit module 11.Charactron circuit module 11 is shown on charactron using the signal of input
Show the synchronization time of current time and setting.
There are two input terminals, respectively current time input terminal and setting time input terminal for the time computing module 9.
Time computing module 9 asks poor to two times, and the difference of synchronization time and current time can be calculated.Time computing module
9 output is connected with the time difference input terminal of data comparison module 10.
There are two input terminals, respectively counting input end and time difference input terminal for the data comparison module 10.Data
The data that comparison module 10 inputs two input terminals are compared, when the count value of counting input end input is defeated less than the time difference
When entering the time difference of end input, the output of data comparison module 10 is 0, conversely, data comparison module 10 exports trigger signal.?
In transmitter system, the output of data comparison module 10 is connected with the triggering of signal emission module 14 input, when there is trigger signal
When, signal emission module starts to emit signal；In receiver system, the output of data comparison module 10 and signal receiving module
15 triggering input is connected, and when there is trigger signal, signal receiving module starts to acquire signal.
The GPS clock module 5, GPS information extraction module 6, pulse counter module 7, digital display module 8, time
Computing module 9, data comparison module 10, setup module synchronization time 12, signal emission module 14, signal receiving module 15 and
Information storage module 16) it is all to be realized using programmable logic device FPGA.
The GPS clock module 5 can adjust the frequency that GPS information reads clock signal according to different GPS systems.
In M-87 GPS signal synchronization system, 5 output clock frequency of GPS clock module is 4800Hz.The GPS information extracts mould
Block 6) it can judge whether GPS system works according to different GPS systems, whether location data is effective, inputs the letter of GPS information
It whether correct ceases prefix, UTC time information and geographical location information is then correctly extracted according to the arrangement order of GPS data type.
In M-87 GPS signal synchronization system, GPS information extraction module 6) extract GPS information process it is as shown in Fig. 2.
The specific workflow of present system is as follows:
1) power module 1 is connected first, is powered by each electricity consumption module of the power module 1 to system；
2) GPS antenna system module 2 receives satellite-signal, and transmits the signal to GPS receiver system module 3, by GPS
It receives system module 3 to be adjusted information, exports GPS information to GPS information extraction module 6, export second pulse signal to arteries and veins
Rush counting unit 7；
3) steady crystal oscillator module 4 generates high accurate clock signal, is conveyed to GPS information after the adjustment of GPS clock module 5 and mentions
Reading clock signal of the modulus block 6 as GPS information；
4) the UTC signal extracted is conveyed to time computing module 9 and digital display module by GPS information extraction module 6
8, after carrying out data point reuse by digital display module 8, it is shown on the charactron of charactron circuit module 11, while GPS information
Extraction module 6 also by the geography information storage of extraction to information storage module 16, is used for later data processing；
5) setup module synchronization time 12 is set according to the UTC time of numeral method by key control circuit module 13
It sets synchronization time, and the synchronization time of setting is conveyed to time computing module 9 and digital display module 8, by digital-scroll technique mould
After block 8 carries out data point reuse, it is shown on charactron；
6) time computing module 9 solves time difference according to calculating the UTC time of input and synchronization time, and by this time
Difference is conveyed to data comparison module 10；
7) second pulse signal of 7 pairs of pulse count unit inputs counts, and by count results in data comparison module
It is compared in 10 with time difference, when count value is less than time difference, data comparison module attonity；When count value is equal to
When time difference, data comparison module exports trigger signal；
8) in transmitter system, the trigger signal trigger signal transmitting module 14 of output starts to emit signal；It is receiving
In machine system, the trigger signal trigger signal receiving module 15 of output is started to work, and acquires signal, so realize transmitter and
Extreme duty time synchronization between receiver.
Spread spectrum coding GPS signal synchronization system of the present invention is, it can be achieved that transmitter system and receiver in spread spectrum coding system
The extreme duty time synchronization of system, it is single to overcome legacy frequencies domain electromagnetic method system synchronizing function, can not achieve transmitting and
Synchronous problem between reception.
Claims (4)
1. a kind of spread spectrum coding GPS signal synchronization system, it is characterised in that: the spread spectrum coding GPS signal synchronization system packet
Include power module (1), GPS antenna system module (2), GPS receiver system module (3), steady crystal oscillator module (4), GPS clock mould
Block (5), GPS information extraction module (6), pulse counter module (7), digital display module (8), time computing module (9), data
Comparison module (10), charactron circuit module (11), setup module synchronization time (12), key control circuit module (13), letter
Number transmitting module (14), signal receiving module (15) and information storage module (16)；The power module (1) with GPS days
Line system module (2), GPS receiver system module (3), steady crystal oscillator module (4), GPS clock module (5), GPS information extract mould
Block (6), pulse counter module (7), digital display module (8), time computing module (9), data comparison module (10), charactron
Circuit module (11), setup module synchronization time (12), key control circuit module (13), signal emission module (14), signal
The supply port of receiving module (15) and information storage module (16) connection, for giving spread spectrum coding GPS signal synchronization system
Power supply is provided；The output of GPS antenna system module (2) is connected with the input of GPS receiver system module (3), for receiving satellite
Signal；GPS receiver system module (3) arranges received signal, and the GPS information of output includes satellite information, time letter
Breath and geographical location information, there are two output ends for GPS receiver system module (3), and an output end is the same as GPS information extraction module
(6) input is connected, and exports GPS information, and the input of the same pulse counter module of another output (7) is connected, and output is believed with GPS
Cease synchronous second pulse signal (1PPS)；The output of pulse counter module (7) and the counting input end of data comparison module (10)
It is connected, the pulse signal of input is counted and exported；Steady crystal oscillator module (4) is used to generate high-precision clock signal,
The output of steady crystal oscillator module (4) is connected with the input of GPS clock module (5)；The reading of GPS clock module (5) output GPS information
Clock signal is taken, carries out frequency dividing adjustment for clock signal of the specific GPS system to input；The output of GPS clock module (5)
It is connected with the input end of clock of GPS information extraction module (6)；GPS information extraction module (6) contains for extracting in GPS information
Coordinated Universal Time(UTC) information and geographical location information, GPS information extraction module (6) is there are two input terminal and two output ends: one
A input terminal is information input terminal, is connected with the output end of GPS receiver system module (3) output GPS information, the other is clock
Input terminal is connected with the output of GPS clock module (5)；One output end is temporal information output end, exports the UTC letter of extraction
Breath, is connected, separately with the current time input terminal of the current time input terminal of digital display module (8) and time computing module (9)
One is position output end, exports the geographical location information of extraction, is connected with the input terminal of information storage module (16)；Information is deposited
Storage module (16) is for storing geographical location information, the output end of information storage module (16) and the number of spread spectrum coding detection system
It is connected according to processing function module, exports the geographical location information of storage, is supplied to later data processing；Key control circuit module
(13) by key switch to system incoming level control signal, the output of key control circuit module (13) with set synchronization time
The input for setting module (12) is connected；Setup module synchronization time (12) passes through input with reference to the Coordinated Universal Time(UTC) signal extracted
Control signal setting system trigger synchronization time, the output of setup module synchronization time (12) respectively with digital display module
(8) setting time input terminal is connected with the setting time input terminal of time computing module (9)；Digital display module (8) has two
A input terminal, respectively current time input terminal and setting time input terminal, digital display module (8) pass through the time to input
ASCII character adjustment is carried out, the charactron control signal of time, the output of digital display module (8) and charactron circuit mould are exported
The input of block (11) is connected；Charactron circuit module (11) shows current time and setting using the signal of input on charactron
Synchronization time；Time computing module (9) is there are two input terminal, respectively current time input terminal and setting time input terminal,
Time computing module (9) asks poor to two times, and the difference of synchronization time and current time is calculated；Time computing module
(9) output is connected with the time difference input terminal of data comparison module (10)；There are two input terminals for data comparison module (10), divide
Not Wei counting input end and time difference input terminal, the data that data comparison module (10) inputs two input terminals are compared,
When the count value of counting input end input is less than the time difference of time difference input terminal input, data comparison module output is 0,
Conversely, data comparison module exports trigger signal；In transmitter system, the output of data comparison module (10) and signal emit
The triggering input of module (14) is connected, and when there is trigger signal, signal emission module starts to emit signal；In receiver system
In, the output of data comparison module (10) is connected with the triggering of signal receiving module (15) input, when there is trigger signal, signal
Receiving module starts to acquire signal.
2. spread spectrum coding GPS signal synchronization system according to claim 1, it is characterised in that: the GPS clock module
(5), GPS information extraction module (6), pulse counter module (7), digital display module (8), time computing module (9), data ratio
Mould is stored compared with module (10), setup module synchronization time (12), signal emission module (14), signal receiving module (15), information
Block (16) is realized using programmable logic device.
3. spread spectrum coding GPS signal synchronization system according to claim 1, it is characterised in that: the GPS clock module
(5) frequency of clock signal is read according to different GPS system adjustment GPS informations.
4. spread spectrum coding GPS signal synchronization system according to claim 1, it is characterised in that: the GPS information is extracted
Module (6) judges whether GPS system works according to different GPS systems, and whether location data is effective, inputs the letter of GPS information
It whether correct ceases prefix, UTC time information and geographical location information is then correctly extracted according to the arrangement order of GPS data type.
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| CN101669341A (en) * | 2007-04-30 | 2010-03-10 | Lm爱立信电话有限公司 | Synchronization time difference measurements in OFDM systems |
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| CN203218957U (en) * | 2012-11-05 | 2013-09-25 | 广州市君盘实业有限公司 | Single-chip microcomputer intelligent control system battery charger based on TOP24X integrated chip |
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| JP2014173968A (en) * | 2013-03-08 | 2014-09-22 | Seiko Epson Corp | Electronic watch |
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|---|---|---|---|---|
| CN101669341A (en) * | 2007-04-30 | 2010-03-10 | Lm爱立信电话有限公司 | Synchronization time difference measurements in OFDM systems |
| CN103929392A (en) * | 2007-04-30 | 2014-07-16 | Lm爱立信电话有限公司 | Synchronization time difference measurements in OFDM systems |
| CN201681384U (en) * | 2010-04-23 | 2010-12-22 | 环达电脑(上海)有限公司 | Single-PCB multi-system framework |
| CN203218957U (en) * | 2012-11-05 | 2013-09-25 | 广州市君盘实业有限公司 | Single-chip microcomputer intelligent control system battery charger based on TOP24X integrated chip |
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