CN206619047U - DDS frequency-hopping arrangements for cold atom interferometer laser SECO - Google Patents
DDS frequency-hopping arrangements for cold atom interferometer laser SECO Download PDFInfo
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Abstract
The utility model is related to a kind of DDS frequency-hopping arrangements for cold atom interferometer laser SECO, device includes the host computer with LABVIEW control programs, ARM chips, CPLD chips, rubidium atomic clock, radio frequency chip and DDS chips, realize that cold atom interferometer atomic velocity is selected, microwave mixer and, it is split by atomic wave in the presence of pi/2 π pi/2 Raman pulse trains, reversion and conjunction Shu Suoxu frequencies, the reference crystal oscillator methods such as same radio frequency source of common quartz crystal crystal oscillator and CPLD and DDS chips are substituted by using rubidium atomic clock, compared with traditional DDS frequency-hopping arrangements, it can realize that the frequency of different frequency hoppings and the time interval of frequency are set, with the higher continuity mutually made an uproar in level and the upper phase of output frequency switching.
Description
Technical field
The utility model is related to a kind of DDS frequency-hopping arrangements for cold atom interferometer laser SECO.
Background technology
Cold atom interferometer has the speed and VELOCITY DISTRIBUTION of very little and good coherence using cold atom cloud, with certainly
It is quality inspection by the cold atom cloud of falling, uses laser to manipulate cold atom to realize matter wave interference to know cold atom
The size of the acceleration of gravity of fall area.Cold atom interferometer is mainly based upon the stimulated Raman transition of two-photon
(stimulated Raman transition, SRT) changes the energy state of atomic interior, atom is split, invert and closed
Beam, eventually forms interference.87Rb atoms are loaded in three-dimensional Magneto-Optical Trap first, and Rb is rubidium atom, and 87 be rubidium atom isotope,
4 μ k are cooled to before free-falling.K is thermodynamic temperature Kelvin, and μ k are 10-6Kelvin, carries out state preparation before interference,
Vertical speed is distributed using microwave raman laser and probably arrived in 1cm/s atom state selection | in F=1 states.Then frequency of use is big
The Raman light beam of off resonance causes former son jump qian, forms interior state interference.Two ground state are finally detected using the method for fluorescence measurement
The layout scenarios of upper population, so that the interference signal of Measurement atom interferometer.Whole process is by three Raman pulse train groups
Into being t respectively at the time of three impulse actions1=0, t2=T, t3When=2T, T are that two adjacent Raman pulses are freely developed
Between, T is a millisecond magnitude in experiment, and pulse width τ is about 10 microseconds.In t1=0 initial time,87Rb atoms all exist | a ＞ states,
After first pi/2 Raman pulse, the atom of half is stayed in | a ＞ states, in addition half atom have the probability of half and be in
| b ＞ states；Because atom external movement can make to be in | the atom of b ＞ states can obtain extra momentum, so as in coordinate and move
With being on quantity space | the atom of a ＞ states is separated, | the atom of b ＞ states is in path 1, | the atom of a ＞ states is in path 2.
Second pulse is π Raman pulses, it is believed that be the process of a state upset；π Raman pulses subtract the Atom Momentum in path 1
The Atom Momentum in few and path 2 increases, and the Atom Momentum in path 2 starts the atom of catch-up ways 1, and spatially two atoms have been
Through separation.After 3rd pi/2 impulse action, the atom in path 1 and path 2 respectively has half to be transformed into the energy state of other side；And pass through
Cross after pursuit, overlapped on momentum on two atomic spaces and again, so the interior state and outer state of two atoms are all mutually intersecting
It is folded, it may appear that interference.
DDS is the english abbreviation of Direct Digital Synthesizer, and DDS is required for phase concept directly synthesis
A kind of frequency synthesis technique of waveform, compared with traditional frequency synthesizer, DDS have low cost, low-power consumption, high-resolution and
The advantages of fast conversion times, telecommunications and electronic instrumentation are widely used in, are a key for realizing equipment total digitalization
Property technology.DDS frequencies mainly pass through realization of tabling look-up.It is theoretical from Nyquist sampling theorem, taken out when sampling frequency is more than
During 2 times of the highest frequency of sample signal, it can be reduced into by obtained data signal of sampling by a low pass filter original
Signal.In fact, it is to do division arithmetic to reference clock by the binary system control word set.Control word is generally 24~48
Word length, it can be considered that DDS is the extension of digital signal processing theory, it is that the hardware of Digital Signal Processing is realized.
DDS device realizes DDS signal sources using embedded microprocessor control DDS chips mostly both at home and abroad at present.At present
Achievement in research for cold atom interferometer DDS signal sources has：Central China University of Science and Technology's Master's thesis《DDS in intervening atom measurement
The development of signal source》, it is published in《Quantum Electronics journal》Article《Acousto-optic modulator digital drive for cold atom interferometer
System》And the DDS Commercial signals source of the newest release of Agilent company of the U.S., but current DDS device produces signal source frequency
Rate time interval is all equal, and mutually makes an uproar in level and phase continuity and have much room for improvement in signal source.
The content of the invention
Current existing technology, which has signal source frequency time interval, to be set, and DDS signal sources are mutually made an uproar level and phase
The indexs such as continuity are not high, the shortcomings of scheme that SECO is used uses upper complex, and the utility model will overcome existing
The disadvantages mentioned above of technology, for the particular/special requirement of cold atom interferometer laser SECO, proposes that a kind of cold atom that is used for is interfered
The DDS frequency-hopping arrangements of instrument laser SECO.
DDS frequency-hopping arrangements described in the utility model for cold atom interferometer laser SECO, it is characterised in that：
The device includes：
Host computer, the time interval for setting Hopping frequencies and Hopping frequencies, the control program of described host computer
Write by LABVIEW；
ARM chips, for obtaining Hopping frequencies word that the control program LABVIEW of host computer passes over and between the time
Every being converted into corresponding frequency word and pass to complex programmable logic device (CPLD) chip by SPI interface；
CPLD chips, the frequency word for obtaining the transmission of ARM chips, DDS cores are passed to by frequency word by SPI interface
Piece, and initialize the amplitude and phase of output frequency；
DDS chips, for obtaining the frequency word of CPLD chips transmission, and are sent to intervening atom by final output frequency
The frequency multiplier of instrument；
Radio frequency chip, for receiving the frequency signal of rubidium atomic clock output, and the frequency signal of reception is converted into specific
The sinusoidal signal of frequency, CPLD chips and DDS chips are transferred to through 4 frequency dividing circuits；
Rubidium atomic clock, is used as the frequency reference source of CPLD chips and DDS chips；
The signal output part of the host computer is connected by USB interface with the signal input part of the ARM chips, described
The signal output part of ARM chips is connected by SPI interface with the first signal input part two-way signaling of the CPLD chips, institute
The signal output part for stating CPLD chips is connected by SPI interface with the first signal input part of the DDS chips；The radio frequency core
The signal input part of piece is connected with the signal output part of described rubidium atomic clock, and the first signal output part of the radio frequency chip leads to
The secondary signal input that 4 frequency dividing circuits are crossed with the CPLD chips is connected, the secondary signal output end of the radio frequency chip with
The secondary signal inputs of the DDS chips is connected, the signal output part of the DDS chips and the frequency multiplier of atomic interferometer
Signal input part is connected.
Described DDS chips include：
Phase accumulator, under the driving of reference signal, is added up for the frequency word that ARM is sended over, obtains phase
Bit code is simultaneously addressed to wave memorizer；
Corresponding amplitude code after wave memorizer, the phase code transcoding for storing phase accumulator；
AD converter, trapezoidal waveform is become for will be stored in the code of the amplitude in wave memorizer；
LPF low pass filters, the trapezoidal waveform for AD converter to be obtained is converted into the continuous wave of output frequency；
Output frequency foutCalculation formula be：
M is frequency control word, fcFor the reference frequency of input, unit is hertz, and N is phase accumulator bit wide, and N values are
32, the frequency of frequency hopping is respectively that atomic velocity selection, microwave mixer, atomic wave are split, invert and closed Shu Suoxu frequency
Rate, frequency control word is the frequency word that host computer is sent to DDS chips；
The signal output that first signal input part of described phase accumulator passes through SPI interface and the CPLD chips
End is connected, and the described secondary signal input of phase accumulator is connected with the secondary signal output end of the radio frequency chip, institute
The signal output part for the phase accumulator stated is connected with the signal input part of described wave memorizer, described wave memorizer
Signal output part be connected with the signal input part of described AD converter, the signal output part of described AD converter with it is described
The signal input parts of LPF low pass filters be connected, the signal output parts of described LPF low pass filters and atomic interferometer
The signal input part of frequency multiplier is connected.
The radio frequency chip is SYN395 chips, and the working frequency of chip is 395M, the frequency that described rubidium atomic clock is launched
Rate is 10 megahertzs.
The model EPM240T100 of CPLD chips.
The signal output part of the host computer is connected by USB2.0 interfaces with the signal input part of the ARM chips.
The output signal of the frequency multiplier by with switching switch switching circuit be divided into two-way, wherein all the way with 7G hertz
Signal is mixed to form 6.834G hertz signals, and another road is connected to form other mixing with remaining frequency emitter.
The beneficial effects of the utility model are：The LABVIEW programs write by host computer arbitrarily set different frequency it
Between time interval, and the precision of time control can reach Microsecond grade；The frequency stability of rubidium atomic clock and index of mutually making an uproar
It is higher than common quartz crystal crystal oscillator；The utility model device rubidium atomic clock substitutes common quartz crystal crystal oscillator joins as frequency
Source is examined, the level of mutually making an uproar for improving DDS device output frequency is reached；The utility model device in order to improve device output switching frequency
The phase continuity index of rate, can be with by CPLD and the same radio frequency source of reference crystal oscillator of DDS chips
Above two device is reduced as far as possible because frequency reference source is different and causes the discontinuity in output frequency switching in phase；
The utility model device employs hopping scheme rather than frequency sweep scheme, and whether hopping scheme is only correct with the frequency for considering to jump, can
It is also easier in influence of the fluctuation of the frequency sweep slope in frequency sweep scheme to cold atom interferometer SECO, operation to avoid
It is practical.
Brief description of the drawings
Fig. 1 is the DDS frequency-hopping arrangement schematic diagrams of the utility model cold atom interferometer laser SECO；
Fig. 2 is the utility model LABVIEW control interface figure；
Fig. 3 is the utility model ARM flow charts；
Fig. 4 is the utility model frequency hopping block diagram；
Fig. 5 is the utility model frequency hopping spectrogram；
Fig. 6 is that the utility model DDS microwaves generate block diagram；
Fig. 7 is that the utility model sweeps tidal atlas.
Embodiment
The utility model is further illustrated below in conjunction with the accompanying drawings
Referring to the drawings：
The DDS frequency-hopping arrangements described in the utility model for cold atom interferometer laser SECO of embodiment 1, should
Device includes：
Host computer 1, the time interval for setting Hopping frequencies and Hopping frequencies, the control program of described host computer
Write by LABVIEW；
ARM chips 2, for obtaining Hopping frequencies word that the control program LABVIEW of host computer passes over and between the time
Every being converted into corresponding frequency word and pass to complex programmable logic device (CPLD) chip by SPI interface；
CPLD chips 3, the frequency word for obtaining the transmission of ARM chips, DDS cores are passed to by frequency word by SPI interface
Piece, and initialize the amplitude and phase of output frequency；
DDS chips 4, do for obtaining the frequency word that CPLD chips are transmitted, and final output frequency being sent into atom
The frequency multiplier of interferometer 7；
Radio frequency chip 5, for receiving the frequency signal of rubidium atomic clock output, and the frequency signal of reception is converted into specific
The sinusoidal signal of frequency, CPLD chips and DDS chips are transferred to through 4 frequency dividing circuits；
Rubidium atomic clock 6, is used as the frequency reference source of CPLD chips and DDS chips；
The signal output part of the host computer is connected by USB interface with the signal input part of the ARM chips, described
The signal output part of ARM chips is connected by SPI interface with the first signal input part two-way signaling of the CPLD chips, institute
The signal output part for stating CPLD chips is connected by SPI interface with the first signal input part of the DDS chips；The radio frequency core
The signal input part of piece is connected with the signal output part of described rubidium atomic clock, and the first signal output part of the radio frequency chip leads to
The secondary signal input that 4 frequency dividing circuits are crossed with the CPLD chips is connected, the secondary signal output end of the radio frequency chip with
The secondary signal inputs of the DDS chips is connected, the signal output part of the DDS chips and the frequency multiplier of atomic interferometer
Signal input part is connected.
Described DDS chips include：
Phase accumulator, under the driving of reference signal, is added up for the frequency word that ARM is sended over, obtains phase
Bit code is simultaneously addressed to wave memorizer；
Corresponding amplitude code after wave memorizer, the phase code transcoding for storing phase accumulator；
AD converter, trapezoidal waveform is become for will be stored in the code of the amplitude in wave memorizer；
LPF low pass filters, the trapezoidal waveform for AD converter to be obtained is converted into the continuous wave of output frequency；It is defeated
Go out frequency foutCalculation formula be：
M is frequency control word, fcFor the reference frequency of input, unit is hertz, and N is phase accumulator bit wide, and N values are
32, the frequency of frequency hopping is respectively that atomic velocity selection, microwave mixer, atomic wave are split, invert and closed Shu Suoxu frequency
Rate, frequency control word is the frequency word that host computer is sent to DDS chips.
The radio frequency chip model SYN395, the working frequency of chip is 395 megahertzs, described rubidium atomic clock transmitting
Frequency be 10 megahertzs.
The model EPM240T100 of CPLD chips.
The signal output part of the host computer is connected by USB2.0 interfaces with the signal input part of the ARM chips.
The output signal of the frequency multiplier by with switching switch switching circuit be divided into two-way, wherein all the way with 7G hertz
Signal is mixed to form 6.834G hertz signals, and another road is connected to form other mixing with remaining frequency emitter.
The technical scheme that the utility model of embodiment 2 is used：Reference picture 1, Fig. 1 is cold atom interferometer laser sequential control
The DDS frequency-hopping arrangement schematic diagrams of system, the control of host computer is to use LABVIEW cold atom interferometer ultra-low frequency isolation system principles
Figure, the program of host computer is the software programming by LABVIEW, and LABVIEW softwares are opened by National Instruments (NI)
Hair, its feature is compared with other computer programming languages：LABVIEW softwares employ graphic programming program G language, production
Raw program is generally the form of block diagram, what the control program of host computer was write by LABVIEW, main to realize the frequency for setting frequency hopping
With the time interval of frequency.The frequency of frequency hopping is set to be mainly used in atomic velocity selection, microwave mixer and in pi/2~π~pi/2
Atomic wave is split in the presence of Raman pulse train, inverts and close beam, and it is the time between each frequency to set the time
Interval.
Reference picture 2, Fig. 2 is LABVIEW control interface figure, central to have FSK_DDS printed words, and this is slave computer
VISA title, as long as VISA title is shown as USB0, the connection for representing the ARM and host computer of system board be it is normal, under
5 frequencies set by face are 5 frequency hoppings f0, f1, f2, f3 and f4 needed for DDS systems, its frequency correspond respectively to P1, P2,
P3, P4 and P5, respectively atomic velocity selection, microwave mixer, atomic wave are split, invert and closed Shu Suoxu frequencies.Separately
Outer to need to set 2 cycle times, the 1st time is interval time of the 2nd frequency to the 3rd frequency, and the 2nd time is the
3 frequencies, the interval times between the 4th frequency, the 5th frequency, it is that frequency sweep mode switches switch to open FSK buttons, and this is opened
It is normal mode of operation when pass is not opened.
The frequency of frequency hopping and the time interval of frequency send ARM chips to by host computer, and ARM chips are by carrying
The interfaces of USB 2.0 are connected with host computer, and the interfaces of USB 2.0 are a kind of new interface technologies applied in computer realm.With mesh
The conventional RS232 of preceding DDS device and other interfaces have transmission speed faster, support hot plug and connection multiple equipment
The characteristics of.ARM chips can obtain Hopping frequencies word and the time interval that LABVIEW is passed over, and be passed to by SPI interface
Frequency information is passed to DDS chips by complex programmable logic device (CPLD) chip, CPLD chips by SPI interface, and just
The amplitude and phase of beginningization output frequency.
Reference picture 3, Fig. 3 is ARM flow charts：
Step S301：PIO interrupt register modules are initialized, PIO refers to process input and output；
Step S302：The signal pins of configuration SPI interface, chip select pin, PS, OSK signal, give PS, OSK pin assignment,
PS, OSK are respectively mode of operation selection and frequency hopping switch；
Step S303：Configure the signals such as digital frequency modulation status pin, the renewal of CPLD resetting pins；
Step S304：The rank interrupted is defined, entrance function is defined；
Step S305：Initialize radio frequency chip register；
Step S306：Define interrupt priority level to trigger with trailing edge, the external interrupt program of execution；
Step S307：Monitor the supply pin of USB port；
Step S308：Data from main frame are received by virtual serial port, data buffer zone is stored in, check that receiving data is
It is no correct, if there is mistake, show corresponding error code.
Frequency word and time interval are transferred to CPLD chips, the model EPM240T100 of chip, and the chip is ALTERA
The MAXII series of company, TQFP encapsulation, 100 pins, 192 macroelements, 240 logic units, 80 input and output connect
Mouthful, the program language of the utility model CPLD chip controls is hardware description language VERILOG HDL, and the software of compiling is scene
Programmable gate array develops software QUARTUS II, and radio frequency has three kinds of states：Idle condition, wait state, working condition.
Reference picture 4, Fig. 4 is frequency hopping block diagram.After electricity on CPLD chips, system is in idle condition, and subsequent system is by sky
Not busy State Transferring exports the frequency of the 1st frequency hopping to wait state, when outer triggering signal EX_CONTROL is high level, is
System is switched to working condition from wait state, if EX_CONTROL signals are continuously high level, system will maintain working condition,
P1, P2, P3, P4 and P5 are atomic velocity selection, microwave mixer, atomic wave are split, invert and closed Shu Suoxu frequencies.P1
For the 1st Frequency point, when outer triggering signal EX_CONTROL is high level, CPLD is sent inside interrupt signal, ARM to ARM
There is the interrupt routine that rising edge is triggered, ARM will send the 2nd frequency word to CPLD after interrupt routine execution, produce the 2nd frequency
Rate, Wait_CNT [24] is the register of the interval time of each generation frequency, and 24 be register digit, when the 2nd frequency production
When raw, timing T0 is stored in Wait_CNT [24] register, after timing T0, during CPLD is sent to ARM again
Break signal, ARM interrupt routines are sent in the 3rd frequency word, Fig. 4, and the interval time between the 2nd frequency and the 3rd frequency is
T0, the interval time of remaining frequency is T1, and its value also is stored in Wait_CNT [24] register.A frequency is often performed
Word, frequency more new signal line CPLD_Update_wire is set to high level.For the phase of the output switching frequency that improves device
Position continuity parameter, by complex programmable logic device (CPLD) chip and the same radio frequency source of reference crystal oscillator of DDS chips, radio frequency
Source produces 395 megahertzs of sinusoidal signal by radio frequency chip, after 4 divide, and believes as CPLD chips with reference to crystal oscillator
Number, it can so eliminate and reduce above two device as far as possible because frequency reference source is different and causes the phase in output frequency switching
Discontinuity on position.
Frequency word is transferred to DDS chips by the SPI interface of CPLD chips, and DDS frequency systems are by phase accumulator, ripple
Shape memory, 4 parts of AD converter and LPF low pass filters are constituted, and the frequency of CPLD chip operations is 395M, this practicality
The SYN395 chips of new utilization MINI CIRCUIT companies devise it is a 10M frequency signals are become into 395M signal circuits,
10M frequency signals are provided by rubidium atomic clock.Under the driving of reference signal, added up for the frequency word that ARM is sended over,
Obtain phase code to go forward side by side traveling wave shape memory addressing, export corresponding amplitude code, amplitude code is become trapezoidal waveform by AD converter,
The continuous wave of frequency can be obtained after low pass filter.Output frequency foutCalculation formula be：
M is frequency control word, fcFor the reference frequency of input, unit is hertz, and N is phase accumulator bit wide, and N values are
32, table 1 is Hopping frequencies table, and the frequency of frequency hopping is respectively that atomic velocity selection, microwave mixer, atomic wave are split, instead
Turn and close Shu Suoxu frequency, frequency control word is the frequency word that host computer is sent to DDS chips.
The Hopping frequencies table of table 1
| Hopping frequencies table code name | Hopping frequencies (MHz) | Frequency control word (16 system) |
| 1 | 80.125 | 33edda68H |
| 2 | 80.525 | 343037fe H |
| 3 | 81.025 | 34832cfaH |
| 4 | 81.525 | 34d621f5H |
| 5 | 82 | 3524f117H |
The level of mutually making an uproar for improving DDS device output frequency is reached, the utility model device substitutes common stone with rubidium atomic clock
English crystal crystal oscillator is as frequency reference source, and rubidium atomic clock has compared with traditional quartz crystal crystal oscillator preferably mutually makes an uproar and power consumption
Level, rubidium atomic clock frequency marking short-term stability can reach 10-12Magnitude, the degree of accuracy is ± 5 × 10-11, rubidium atomic clock month drift
Move as 1 × 10-11~4 × 10-11, frequency reproducibility is 1 × 10-11~5 × 10-11, from stability, drift rate and accuracy
Index rubidium atomic clock is better than traditional quartz crystal crystal oscillator, and frequency is used as with rubidium atomic clock in terms of the result that frequency spectrograph is tested out
The index of mutually making an uproar of rate reference source is higher than quartz crystal crystal oscillator frequency reference source.
Reference picture 5, Fig. 5 is frequency hopping spectrogram, and figure intermediate frequency spectrum tester is P1, P2, P3, P4 and P5 in frequency spectrograph, figure
It is 5 frequencies required when cold atom interferometer is had an effect；Reference picture 6, Fig. 6 is that DDS microwaves generate block diagram, and DDS device is defeated
Go out frequency P1, after frequency multiplier, frequency is changed into original 2 times, after switching switch, can be mixed, generate with 7G all the way
6.834G hertz signals, can also produce the mixed frequency signal that Raman light modulation needs by switching circuit；Reference picture 7, Fig. 7 is tide
Nighttide figure, abscissa is the time, and unit is hour, and ordinate is change in gravitational acceleration value caused by tide, and ordinate is tide
Caused change in gravitational acceleration value, unit is microgal, and gal is the unit of expression gravity field strength in gravity measurement, microgal unit
It is expressed as 10-6cm/s2, cm for centimetre, s is the second.In figure real thick line be in theoretical tidal atlas, figure fine rule to utilize the utility model
Tidal atlas is swept in DDS device formation, and to sweep time of tidal atlas be 24 hours, as can be seen from the figure it is actual sweep tidal atlas with
Theoretical tidal atlas is that comparison coincide, this also demonstrate that the output frequency of the utility model DDS device mutually make an uproar with continuity compared with
It is good, otherwise it can not be coincide with theoretical tidal atlas.
Content described in this specification embodiment is only enumerating to the way of realization of utility model design, and this practicality is new
The protection domain of type is not construed as being only limitted to the concrete form that embodiment is stated, protection domain of the present utility model is also wrapped
Include those skilled in the art according to the utility model conceive it is conceivable that equivalent technologies mean.
Claims (6)
1. the DDS frequency-hopping arrangements for cold atom interferometer laser SECO, it is characterised in that：The device includes：Host computer,
ARM chips, CPLD chips, DDS chips, radio frequency chip and rubidium atomic clock, the signal output part of the host computer are connect by USB
Mouthful be connected with the signal input part of the ARM chips, the signal output parts of described ARM chips by SPI interface with it is described
First signal input part of CPLD chips is connected, and the signal output part of the CPLD chips passes through SPI interface and the DDS chips
The first signal input part be connected；The signal output part phase of the signal input part of the radio frequency chip and described rubidium atomic clock
Even, the secondary signal input phase that the first signal output part of the radio frequency chip passes through 4 frequency dividing circuits and the CPLD chips
Even, the secondary signal output end of the radio frequency chip is connected with the secondary signal input of the DDS chips, the DDS chips
Signal output part be connected with the signal input part of the frequency multiplier of atomic interferometer.
2. it is used for the DDS frequency-hopping arrangements of cold atom interferometer laser SECO as claimed in claim 1, it is characterised in that：
Described DDS chips include phase accumulator, wave memorizer, AD converter and LPF low pass filters, and described is phase-accumulated
First signal input part of device is connected by SPI interface with the signal output part of the CPLD chips, described phase accumulator
Secondary signal input be connected with the secondary signal output end of the radio frequency chip, the signal output of described phase accumulator
End is connected with the signal input part of described wave memorizer, and the signal output part of described wave memorizer turns with described AD
The signal input part of parallel operation is connected, and the signal of the signal output part and described LPF low pass filters of described AD converter is defeated
Enter end to be connected, the signal output part of described LPF low pass filters is connected with the signal input part of the frequency multiplier of atomic interferometer.
3. it is used for the DDS frequency-hopping arrangements of cold atom interferometer laser SECO as claimed in claim 1, it is characterised in that：
The radio frequency chip is SYN395 chips, and the radio frequency chip working frequency is 395M, and the frequency of described rubidium atomic clock transmitting is
10 megahertzs.
4. it is used for the DDS frequency-hopping arrangements of cold atom interferometer laser SECO as claimed in claim 1, it is characterised in that：
The model EPM240T100 of the CPLD chips.
5. it is used for the DDS frequency-hopping arrangements of cold atom interferometer laser SECO as claimed in claim 1, it is characterised in that：
The signal output part of the host computer is connected by USB2.0 interfaces with the signal input part of the ARM chips.
6. it is used for the DDS frequency-hopping arrangements of cold atom interferometer laser SECO as claimed in claim 1, it is characterised in that：
The output signal of the frequency multiplier is divided into two-way by the switching circuit with switching switch, wherein being mixed all the way with 7G hertz signals
6.834G hertz signals are formed, another road is connected to form other mixing with remaining frequency emitter.
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