CN201548703U - Pseudo-random signal transmitter - Google Patents
Pseudo-random signal transmitter Download PDFInfo
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- CN201548703U CN201548703U CN2009202591570U CN200920259157U CN201548703U CN 201548703 U CN201548703 U CN 201548703U CN 2009202591570 U CN2009202591570 U CN 2009202591570U CN 200920259157 U CN200920259157 U CN 200920259157U CN 201548703 U CN201548703 U CN 201548703U
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Abstract
The utility model discloses a pseudo-random signal transmitter which comprises a casing and modules positioned in the casing, wherein, the modules positioned in the casing includes a CPU module, a CPLD module in two way linkage with the CPU module, a GPS timing module accessed to the CPLD module, and a voltage current transformer accessed to the CPU module through an A/D conversion module; the CPLD module is accessed to an IGBT power module through an IGBT driver module. The pseudo-random signal transmitter can generate pseudo-random signals when being powered only by an external high-voltage direct current supply; the generated signals have high precision and less time delay; the output pseudo-random signals are synchronous with the GPS timing signals; the precision in signal receiving is further improved.
Description
Technical field
The utility model relates to a kind of signal generation apparatus, specifically is a kind of pseudo random signal transmitter.
Background technology
In the geophysical survey field, when the utilization electromagnetic method is explored, need special-purpose signal generator.The multi-functional electrical method receiver of V8 that the multi-functional electrical method receiver of GDP-32 that U.S. ZONGE company produces, Canadian phoenix company produce, the square wave that generally uses double-flanged end square wave and certain dutycycle is as sending signal.
Because the square wave limited bandwidth, and transmission frequency doubly increases by index, and frequency resolution is not high.And the signal that the pseudo random signal receiver receives also comprises pseudo random signal, the User Defined waveform of various frequency spectrums except the square wave of various dutycycles.The also corresponding raising of the complexity of waveform and bandwidth.
Existing generator for electrical surveying signal can't satisfy the requirement of pseudo random signal electromagnetic survey.
The utility model content
The purpose of this utility model is to overcome the above-mentioned technological deficiency of external instrument, a kind of pseudo random signal generator that only need provide the external high pressure direct supply can produce pseudo random signal is provided, the signal accuracy height that produces, time delay is few, and the pseudo random signal and the GPS time signal of output are synchronous, have further improved the precision of acknowledge(ment) signal.
The utility model is achieved through the following technical solutions, a kind of pseudo random signal transmitter comprise casing and be positioned at the CPU module of casing inside, with the two-way CPLD module that is connected of CPU module, insert the GPS time service module of CPLD module and insert the voltage current transformer of CPU module by the A/D modular converter, described CPLD module inserts the IGBT module by the IGBT driver module.
Wherein the CPLD module comprises cpu bus expanded circuit and pseudorandom waveform generation unit; Pseudorandom waveform generation unit is made of programmable frequency divider, program control address generator circuit, waveform storage chip (being the EPROM chip) and dead band delay circuit; The sequential circuit formed by counter and trigger of dead band delay circuit wherein.
According to the preferred version of embodiment, the CPLD module is connected with keyboard circuit, LCD display and communication port.CPU directly links to each other with real-time timepiece chip with data-carrier store by bus.The 6MBP75RA12 intelligence IGBT power model that described IGBT module adopts Japanese fuji company to produce.This inside modules contains six power MOS pipes, wherein forms the H bridge inverter main circuit by four metal-oxide-semiconductors, also has a metal-oxide-semiconductor control fictitious load path.
GPS time service module in the utility model preferably adopts the commercial GPS time service module finished product of technical grade, and it provides global standards signal second and synchronous with it 32Hz square-wave signal.GPS time service module is come synchronous inner high-accuracy and constant temperature crystal oscillator by the time signal that receives the atomic clock on the gps satellite, and second signal and other synchronous with it frequency signal of outputting standard.Because each GPS time service module all is to receive same gps satellite signal to come work, so they can both provide the standard second signal of same precision, error can reach 10-9 second.Therefore when pseudo random signal transmitter and pseudo random signal receiver inside all are equipped with GPS time service module, they just are equivalent to work under the commander of the time signal that gps satellite sends, just as between them, having set up a synchronizing cable, the work schedule of pseudo random signal transmitter and pseudo random signal receiver internal circuit synchronously.Such synchronous working mechanism is for the reception precision that improves signal, and lessen any interference all is of great benefit to.
Two kinds of frequency signals that GPS time service module produces are imported the LPLD module simultaneously.Allow the 32Hz square-wave signal as driving the clock signal that CPLD produces pseudo random signal.The 1Hz square-wave signal is then imported the interrupt pin of single-chip microcomputer, as the control signal of the synchronous output of pseudo random signal.
Described CPLD is a CPLD, and it can download to chip internal by the mode of downloading with the logical circuit that designs on computers, thereby realizes corresponding logic function.Also can revise the circuit of design and do not need real physical circuit is made amendment by downloading again.
The pseudo random signal generator that pseudo random signal generator described in the utility model only need provide the external high pressure direct supply can produce pseudo random signal, the signal accuracy height that produces, time delay is few, and the pseudo random signal and the GPS time signal of output are synchronous, has further improved the precision of acknowledge(ment) signal.
Below in conjunction with the drawings and specific embodiments the utility model is described further.
Description of drawings
Fig. 1 is the structural representation of the described pseudo random signal transmitter of embodiment;
Fig. 2 is the structural representation of CPLD among Fig. 1;
Fig. 3 is the circuit diagram of program control address generator among Fig. 2;
Fig. 4 is delay circuit figure in dead band among Fig. 2;
Fig. 5 is an IGBT driver module circuit diagram among Fig. 1.
Embodiment
As shown in Figure 1, a kind of pseudo random signal transmitter comprises casing and is positioned at the composition such as microcomputer plate, GPS time service module, IGBT driver module and IGBT module, LCD display and keyboard, power supply of casing inside.The CPU module is installed on the microcomputer plate, with the two-way CPLD module that is connected of CPU module, insert the GPS time service module of CPLD module and insert the voltage current transformer of CPU module by the A/D modular converter, described CPLD module inserts the IGBT power model by the IGBT driver module.Described CPLD module comprises cpu bus expanded circuit and pseudorandom waveform generation unit.
As shown in Figure 2; described cpu bus expanded circuit comprises bus selection module, serial communication selection module and port expansion module; pseudorandom waveform generation unit comprises the programmable frequency divider that is connected with GPS time service module, described programmable frequency divider program control address generator, waveform storage chip (being the EPROM chip), the dead band delay circuit by being connected with the port expansion module successively; insert signal output locking protection circuit; final output signal also is connected with synchronization control circuit on this programmable frequency divider.
Wherein CPU is the control core of whole instrument of module; The CPU module directly links to each other with real-time timepiece chip with data-carrier store by bus, can directly read the real-time clock data and the current data when instrument worked is saved in the data-carrier store chip.CPU also directly links to each other with the CPLD module, the waveform that control produces and the frequency of output.The voltage and current data in A/D converter acquisition instrument when work under the control of CPU, and it is pending that data are sent to CPU.
Port expansion and waveform that the CPLD module is responsible for CPU take place.So keyboard circuit all is connected with CPU by the port of CPLD expansion with LCD display and communication port.Pseudorandom waveform generating unit is the Core Feature of CPLD, and he not only wants to produce the pseudorandom waveform of various frequency spectrums, also will carry out synchro control, makes that the pseudorandom waveform of output is synchronous with GPS signal second.
The signal that CPLD produces offers the IGBT driver module.Through the IGBT driver module Signal Spacing and shaping are amplified rear drive intelligence IGBT power model.
The CPLD inner structure specifies as follows: at first provided the cpu bus expansion.Secondly he will carry out various frequency divisions and frequency selection to the GPS standard frequency of input.Sending into pseudorandom waveform generation unit through the square-wave signal of frequency-selecting has just exported with the pseudo random signal of GPS signal Synchronization second.Also need pseudo random signal is sent into the dead band delay circuit earlier in order to drive actual IGBT circuit.So just generated a pair of pseudorandom drive signal that comprises interval, dead band and phase differential 180 degree.In output signal, also must provide the hardware overcurrent protection, when output current is excessive, stop the generation of waveform automatically, protection instrument and operating personnel's safety by hardware.The logic function of the described pseudo random signal generator of present embodiment is programmed to the CPLD chip and is realized.
It is the EPROM storage chip that the inner program control address generator circuit that constitutes of CPLD is directly connected to the waveform storage chip that is positioned on the microcomputer plate.Formed pseudorandom waveform generation module by programmable frequency divider, program control address generator, EPROM waveform storage chip, dead band delay circuit.Because the pseudo random signal transmitter can produce the signal of multiple frequency spectrum,, adopt the mode of tabling look-up to come output signal so the waveform of these signals is stored in according to different kinds in the different address fields of storer by the waveform memory circuit.Produce the inquire address of the different address field Wave datas of inquiry again by program control address generator circuit as shown in Figure 3.Single-chip microcomputer output will send the instruction of the signal of this kind frequency spectrum, changes out this frequency spectrum that section in storer by decoding scheme, and exports the address that can inquire about this section, so just can read the waveform of this section stored.
Main control chip 78E516 single-chip microcomputer on the microcomputer plate is according to the second signal of the global standards 1Hz that imports from GPS time service module, with 0: 0: 0 of every day as starting point, the cycle of the low-limit frequency that comprises in the pseudo random signal with transmission is as the interval, after calculating, find out each synchronization point, control the synchronous generation of pseudo random signal, just synchronization criterion.When the pseudo random signal transmitter stopped to export, single-chip microcomputer output locking signal make the pseudo random signal generator circuit quit work, and circuit reset made zero.When needs entered work, single-chip microcomputer can calculate earlier and close on most synchronization point, and constantly made pseudo random signal generation circuit work output waveform immediately at that.So just realized the synchronous output of signal.Pseudo random signal receiver inside also is similar synchronized algorithm.
Behind the dead band delay circuit through the CPLD chip internal, export a pair of on the contrary and contain the dead band pseudorandom multi-frequency signal of interval time.This a pair of signal is not antipodal, and they have 25 microseconds when changing mutually time is low level simultaneously, and the metal-oxide-semiconductor up and down that so just can guarantee the IGBT module can the while admittance, thereby causes power supply short circuit.
As shown in Figure 4, the sequential circuit formed by counter and trigger of described dead band delay circuit.Two triggers are formed the control circuit of interlocking, and it can guarantee input at any one time, and output all has only one the tunnel to be high level.When the input state of dead band delay circuit changes, the upset of trigger need wait for that the count value of counter circuit reaches, the state of output terminal just can change, and the output terminal of two triggers is the counters that lock the other side mutually, so just can the time-delay of enabling counting device counting after the trigger output state only changes.Counter circuit is composed in series by 24 digit counter chips, and the count value maximum is set in 256, also can change little as required.Count value is big more, and the dead band time-delay of generation is also big more.Counter is counted the frequency that the external active crystal oscillator produces.The frequency of external active crystal oscillator is 10MHz, so the size of dead band delay value is 1/10MHz * 256=25.6uS.Owing to be that crystal frequency is counted, so delay value is reliable and stable.The dead band delay value can accurately be adjusted between 0～25.6uS.
As shown in Figure 5, described IGBT driver module provides IGBT module drive insulating power supply, and to carrying out light-coupled isolation from the drive signal of pseudorandom waveform generation module.Isolated from power has adopted the DCDC power module of isolated form, and the power supply that the battery of 12V is provided is converted into the 15V driving power that the IGBT module needs.6N137 high speed optoelectronic coupling chip has been used in the photoelectricity coupling of signal.By the isolation of power supply and signal, make high-tension circuit and low-voltage control circuit on circuit, separate fully, guaranteed safety of using and the blocking-up that high pressure forceful electric power end is disturbed.
The 6MBP75RA12 intelligence IGBT power model that the IGBT module adopts Japanese fuji company to produce.The maximum operating currenbt of this module is 75 amperes, and withstand voltage is 1200 volts.For safe and stable operation, the utility model is set in 20 amperes 800 volts with the working point.This inside modules contains 6 power mos pipes, and four mos pipes are wherein formed the H bridge inverter main circuit, the high direct voltage of input are changed into the pseudorandom high-voltage signal output of interchange.One of remaining two power tubes is used to control fictitious load.When pseudo random signal transmitter output be the waveform of cabinet-type the time, the high direct voltage electric current of input also can be with doing violent fluctuation across waveform.Particularly when the supplier of DC high-voltage power supply is small generator, because the big ups and downs meeting of electric current causes the instability of generator operation.The instability of input current during for balance transmitter output gap signal, the utility model has designed the path of a fictitious load.When output signal is zero, for the balance input current, input current is imported to a fictitious load consume, input current is with regard to variation that can not be violent like this.Thereby the running that has guaranteed generator system is steady.
The high-power high voltage direct supply that system need be provided by the outside in work.This power supply can provide in the mode of electric battery, but considers that the power that electric battery provides is less, and not too economical, and normally the mode that adds rectifier with generator provides this power supply.The power that this mode provides is bigger, and provides the electric energy duration longer.
Rectifier is exactly that all-wave diode bridge heap and filter capacitor group constitute, and selects through device withstand voltage, makes it can be operated in output direct current 800V, and under the environment of electric current 20A, and the ripple voltage of output direct current is less than 2%.
In order to make ripple littler, and efficient is higher, can use threephase alternator usually.Use the threephase alternator of 400Hz littler, and efficiency of rectification is higher than the threephase alternator output ripple that uses 50Hz.Under the situation of using the 50Hz380V20Kw threephase alternator, can offer the direct current of pseudo random signal transmitter 530V 20A.Rectifier and three phase generator belong to the equipment that the user is equipped with voluntarily.
Synchronous effect is the precision that improves received signal during for received signal.The second signal that adopts high precision time service GPS to provide comes the signal of control synchro to send and the signal reception of receiver also is the unique novel place of the utility model.This method of synchronization is to adopt synchronously remote many instruments of receiving satellite signal, has realized wireless synchronization.Greatly facilitate the operation of open-air constructors, and can realize that the high-precision signal of signal receives.
Make described pseudo random signal generator only need the outside that high-voltage DC power supply is provided through effective combination of above technology, the bilateral pseudo random signal of promptly exportable and GPS time signal synchronous waveform.The voltage of output signal approximates the high direct voltage of outside input, and maximum is no more than 800V.The electric current of output signal is subjected to the control of loaded impedance and input high direct voltage, and maximum is no more than 20 amperes.This utility model is mainly used in the geophysical survey field, for the electromagnetic method geophysical survey provides high-precision, a convenient pseudo random signal source of using.
Claims (5)
1. pseudo random signal transmitter, it is characterized in that comprising casing and be positioned at the CPU module of casing inside, with the two-way CPLD module that is connected of CPU module, insert the GPS time service module of CPLD module and insert the voltage current transformer of CPU module by the A/D modular converter, described CPLD module inserts the IGBT module by the IGBT driver module.
2. according to the described pseudo random signal transmitter of claim 1, it is characterized in that described CPLD module comprises cpu bus expanded circuit and pseudorandom waveform generation unit; Pseudorandom waveform generation unit is made of programmable frequency divider, program control address generator circuit, waveform storage chip and dead band delay circuit; The sequential circuit formed by counter and trigger of dead band delay circuit wherein.
3. according to claim 1 or 2 described pseudo random signal transmitters, it is characterized in that described CPLD module is connected with keyboard circuit, LCD display and communication port.
4. according to claim 1 or 2 described pseudo random signal transmitters, it is characterized in that described CPU module directly links to each other with real-time timepiece chip with data-carrier store by bus.
5. according to claim 1 or 2 described pseudo random signal transmitters, it is characterized in that the 6MBP75RA12 intelligence IGBT power model that described IGBT module adopts Japanese fuji company to produce, this inside modules contains six power MOS pipes, wherein form the H bridge inverter main circuit, also have a metal-oxide-semiconductor to connect the fictitious load path by four metal-oxide-semiconductors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202591570U CN201548703U (en) | 2009-11-06 | 2009-11-06 | Pseudo-random signal transmitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202591570U CN201548703U (en) | 2009-11-06 | 2009-11-06 | Pseudo-random signal transmitter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102681018A (en) * | 2011-03-10 | 2012-09-19 | 福州勘达源电子科技有限公司 | Transient electromagnetic instrument for mine and transient electromagnetic signal processing method |
| CN103412338A (en) * | 2013-08-13 | 2013-11-27 | 北京桔灯地球物理勘探有限公司 | Pseudo-random code electrical instrument |
| CN104459802A (en) * | 2014-12-01 | 2015-03-25 | 中国地质大学（北京） | Emission device for electrical prospecting system |
| CN109002277A (en) * | 2018-11-05 | 2018-12-14 | 湖南继善高科技有限公司 | A kind of pseudo-random signal dynamic configuration system and method |
-
2009
- 2009-11-06 CN CN2009202591570U patent/CN201548703U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102681018A (en) * | 2011-03-10 | 2012-09-19 | 福州勘达源电子科技有限公司 | Transient electromagnetic instrument for mine and transient electromagnetic signal processing method |
| CN102681018B (en) * | 2011-03-10 | 2015-04-22 | 福州勘达源电子科技有限公司 | Transient electromagnetic instrument for mine and transient electromagnetic signal processing method |
| CN103412338A (en) * | 2013-08-13 | 2013-11-27 | 北京桔灯地球物理勘探有限公司 | Pseudo-random code electrical instrument |
| CN104459802A (en) * | 2014-12-01 | 2015-03-25 | 中国地质大学（北京） | Emission device for electrical prospecting system |
| CN109002277A (en) * | 2018-11-05 | 2018-12-14 | 湖南继善高科技有限公司 | A kind of pseudo-random signal dynamic configuration system and method |
| CN109002277B (en) * | 2018-11-05 | 2019-03-22 | 湖南继善高科技有限公司 | A kind of pseudo-random signal dynamic configuration system and method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20131106 |