CN204408319U - For the atomic clock module of the Big Dipper/gps time signal communication network time service equipment - Google Patents

Abstract

A kind of atomic clock module being used for the Big Dipper/gps time signal communication network time service equipment, include central control circuit (1), frequently conjunction/modulation circuit (2), Weak Signal Detecting Circuit (3) and atomic clock physical system (4), totally four parts combine formation entirety.Utilize coherent layout to imprison effect principle and design special quantum physical system module, by optics such as VCSEL LASER Light Source, 1/4th slides, caesium Cs vapor chamber, photocells, be encapsulated in a physical module; Adopt DDS+PLL frequency synthesis technique simultaneously, export the modulating frequency of high-precision 4.56GHz, meet atomic clock system 10 ^-12the requirement of frequency stability.Time service equipment adopts atomic clock module as punctual module, and time service precision also improves thereupon, can meet the requirement of modern communications to the high precision of time signal, have reasonable in design, reliability is high, environmental suitability is strong, volume is little, the feature such as easy to use.

Description

For the atomic clock module of the Big Dipper/gps time signal communication network time service equipment

Technical field

The utility model relates to a kind of atomic clock module, particularly a kind of atomic clock module being used for the Big Dipper/gps time signal communication network time service equipment.

Background technology

In the design process of traditional frequency hopping radio set, be limited to the compensation crystal that precision is lower, the aspects such as frequency hopping communications network is partially long for settling time, and time to lose lock is partially short are had problems, therefore, a kind of communication network time service equipment being used for the Big Dipper/gps time signal arises at the historic moment.

Time service equipment cannot under coverage condition at the Big Dipper/GPS, and the time service precision of equipment is limited to the punctual module of device interior---the precision of constant temperature crystal.First, the frequency source of crystal is in mechanical oscillation source, and its frequency limited, in the change of mechanical dimension and pressure, makes crystal frequency precision not high like this; Secondly, the accuracy of timekeeping of crystal be limited to environmental factor as: temperature, vibration, radiation etc., the discreteness of quartz crystal itself also have impact on quartz clock accuracy of timekeeping in addition.

Utility model content

The purpose of this utility model is exactly the defect existed to overcome above-mentioned prior art, adopts atomic clock module to keep time, and provide a kind of reasonable in design, structure is simply for the atomic clock module of the Big Dipper/gps time signal communication network time service equipment.

In order to achieve the above object, the technical solution adopted in the utility model is:

A kind of atomic clock module being used for the Big Dipper/gps time signal communication network time service equipment, includes central control circuit 1, frequently conjunction/modulation circuit 2, Weak Signal Detecting Circuit 3 and atomic clock physical system 4, and totally four parts combine formation entirety, wherein:

Described central control circuit 1, comprises CPU module U1 again, A/D module U2, VCXO module U3.High-frequency signal is exported in order to control conjunction/modulation circuit 2 frequently; Receive the correction magnitude of voltage that Weak Signal Detecting Circuit 3 exports; According to correction magnitude of voltage, regulate VCXO module U3, output stability is 10 ^-12standard frequency 10MHz.

Described frequency conjunction/modulation circuit 2, comprises buffer module U4 again, DDS1 module U5, PLL module U6, modulation module U7, amplification module U8, DDS2 module U9.In order to the control word of receiving center control circuit 1 output respectively, DDS1 module U5 is exported on a road, exports the frequency of 100MHz, through PLL module U6, and the local oscillation signal of the 4.56GHz that doubly occurs frequently; DDS2 module U9 is exported on another road, exports 10KHz modulation signal.The local oscillation signal of 4.56GHz and the modulation signal of 10KHz, through modulation module U7, after amplification module U8 process, export the modulating frequency of 4.56GHz.

Described Weak Signal Detecting Circuit 3, comprises again Detection of Weak Signals module U11, demodulation module U12, DDS3 module U13.In order to receive the toggle rate that atomic clock physical system 4 exports on the one hand, through Detection of Weak Signals module U11 process, export to demodulation module U12; The control word of receiving center control circuit 1 output on the other hand, DDS3 module U13 module exports 10KHz restituted signal, sends into demodulation module U12.Toggle rate and 10KHz restituted signal, after demodulation module U12 process, export correction magnitude of voltage.

Described atomic clock physical system 4, comprises special quantum physical system module U10.In order to receive the modulation signal of the 4.56GHz that conjunction/modulation circuit 2 frequently exports, VCSEL(vertical cavity surface emitting laser to special quantum physical system module U10 inside) modulate, obtain two bundle coherent lights, the circular polarization state of two-beam is realized with 1/4 wave plate, when two-beam irradiates caesium (Cs) vapor chamber simultaneously, cause electromagnetically induced transparent, produce the imprison of CPT(coherent layout) effect; The change being detected VCSEL transmitted light intensity by phase discriminator forms feedback, locks modulating frequency 4.56GHz, exports toggle rate.

It is particularly worth mentioning that:

The utility model, for meeting index request, have employed DDS+PLL frequency synthesis technique and special quantum physical system module.

Described DDS+PLL frequency synthesis technique, is with a DDS module U5, encourages a PLL module U6, with PLL loop, DDS is outputed signal frequency multiplication to required high-frequency band, the clutter interference outputed signal with filter filtering DDS.Thus making DDS+PLL system output signal have the advantage of DDS and PLL concurrently, circuit structure is simple, exports 4.56GHz local oscillation signal, meets atomic clock system 10 ^-12the requirement of frequency stability.

Described special quantum physical system module, by VCSEL LASER Light Source, 1/4th slides, optics such as caesium (Cs) vapor chamber, photocell etc., be encapsulated in a physical module, the volume meeting system requirements is little, and reliability is high, the demand that precision is high.

The course of work of the present utility model is:

Central control circuit output digit signals regulates and controls conjunction/modulation circuit output frequently, the 4.56GHz modulation signal of conjunction/modulation circuit output frequently, through special quantum physical system resume module, exports toggle rate; Toggle rate, through Weak Signal Detecting Circuit process, exports correction magnitude of voltage, and central control circuit is according to this correction magnitude of voltage, and regulation output digital signal on the one hand, again regulates and controls conjunction/modulation circuit output frequently, form servo loop; Regulation and control VCXO module on the other hand, outputting standard frequency.

In sum, the utility model have employed DDS+PLL frequency synthesis technique and special quantum physical system module, and atomic clock output frequency stability reaches 10 ^-12, the time service precision of time service equipment also improves thereupon, can meet the requirement of modern communications to the high precision of time signal; And the utility model is reasonable in design, reliability is high, environmental suitability is strong, volume is little, easy to use.

Accompanying drawing explanation

Fig. 1 is the utility model circuit theory diagrams.

Symbol description in figure:

1 central control circuit;

2 frequency conjunction/modulation circuits;

3 Weak Signal Detecting Circuits;

4 atomic clock physical systems.

Wherein:

U1 is CPU module;

U2 is A/D modular converter;

U3 is VCXO module;

U4 is buffer module;

U5 is DDS1 module;

U6 is PLL module;

U7 is modulation module;

U8 is amplification module;

U9 is DDS2 module;

U10 is special quantum physical system module;

U11 is Detection of Weak Signals module;

U12 is demodulation module;

U13 is DDS3 module.

Embodiment

Referring to shown in Fig. 1, is specific embodiment of the utility model.

A kind of atomic clock module being used for the Big Dipper/gps time signal communication network time service equipment, includes central control circuit 1, frequently conjunction/modulation circuit 2, Weak Signal Detecting Circuit 3 and atomic clock physical system 4, and totally four parts combine formation entirety, wherein:

Described central control circuit 1, comprises CPU module U1, A/D module U2, VCXO module U3; And:

72,73,74,20 ~ 27 pin of CPU module U1 are connected with 15,17,21,26 ~ 33 pin of A/D module U2 respectively;

1 pin of VCXO module U3 is connected with 56 pin of CPU module U1, the 2 pin outputting standard frequency 10MHz of VCXO module U3.

Described frequency conjunction/modulation circuit 2, comprises buffer module U4, DDS1 module U5, PLL module U6, modulation module U7, amplification module U8; And:

2,3,5,6,8,9,11,12 pin of buffer module U4 are connected with 28 ~ 35 pin of CPU module U1;

1 ~ 7 pin of DDS1 module U5 and 47,46 of buffer module U4,44,43,41,40,38,37 pin are connected;

23 pin of PLL module U6 are connected with 17 pin of DDS1 module U5;

1 ~ 4,25 ~ 28 pin of DDS2 module U9 are connected with 50 ~ 57 pin of CPU module U1;

68 pin of modulation module U7,29 pin respectively with 18 pin of PLL module U6,27 pin of DDS2 module U9 are connected;

34 pin of amplification module U8 are connected with 51 pin of modulation module U7.

Described Weak Signal Detecting Circuit 3, comprises Detection of Weak Signals module U11, demodulation module U12, DDS3 module U13.And:

2 pin of demodulation module U12,7 pin, 28 pin respectively with 17 pin of Detection of Weak Signals module U11,5 pin of described DDS3 module U13,35 pin of A/D module U2 are connected;

1 ~ 4,25 ~ 28 pin of DDS3 module U13 are connected with 50 ~ 57 pin of CPU module U1.

Described atomic clock physical system 4, comprises special quantum physical system module U10; And:

1 pin of special quantum physical system module U10,2 pin respectively with 21 pin of amplification module U8,12 pin of Detection of Weak Signals module U11 are connected.

The utility model main components model specification is as follows:

U1：SPCE061A；

U2：ADS8402；

U3：KV14-33-SINE-B-J-10MHz；

U4：SN74LVC16244A；

U5、U7、U12：AD9854；

U6：ADF4106；

U8：MAX3971A；

U9、U13：AD9850；

U10: special quantum physical system module;

U11：AD630；

Remaining part is technical grade general part.

Above embodiment is only the utility model preferred embodiment, in order to technical characteristic of the present utility model and exploitativeness to be described, and is not used to limit patent right of the present utility model; Above description, should understand for knowing those skilled in the art and be implemented simultaneously.Therefore, do not departing under the prerequisite that the utility model discloses, the change of the equivalence completed or modification, be all included in described right.

The utility model is the atomic clock module of a rare one for the Big Dipper/gps time signal communication network time service equipment.This module possesses creativeness, novelty, practicality and progressive, meets utility application important document, therefore files an application according to Patent Law.

Claims (4)

1. the atomic clock module for the Big Dipper/gps time signal communication network time service equipment, include central control circuit (1), frequently conjunction/modulation circuit (2), Weak Signal Detecting Circuit (3) and atomic clock physical system (4), totally four parts combine formation entirety, it is characterized in that:

Described central control circuit (1), comprises CPU module U1, A/D module U2, VCXO module U3; Wherein:

The 72nd, 73,74 of described CPU module U1,20 ~ 27 pin are connected with 15,17,21,26 ~ 33 pin of described A/D module U2 respectively;

1 pin of described VCXO module U3 is connected with the 56th pin of described CPU module U1, the 2 pin outputting standard frequency 10MHz of described VCXO module U3.

2., as claimed in claim 1 for the atomic clock module of the Big Dipper/gps time signal communication network time service equipment, it is characterized in that:

Described frequency conjunction/modulation circuit (2), comprises buffer module U4, DDS1 module U5, PLL module U6, modulation module U7, amplification module U8, DDS2 module U9; Wherein:

2,3,5,6,8,9,11,12 pin of described buffer module U4 are connected with 28 ~ 35 pin of described CPU module U1;

1 ~ 7 pin of described DDS1 module U5 and 47,46 of described buffer module U4,44,43,41,40,38,37 pin are connected;

23 pin of described PLL module U6 are connected with 17 pin of described DDS1 module U5;

1 ~ 4,25 ~ 28 pin of described DDS2 module U9 are connected with 50 ~ 57 pin of described CPU module U1;

68 pin of described modulation module U7,29 pin respectively with 18 pin of described PLL module U6,27 pin of described DDS2 module U9 are connected;

34 pin of described amplification module U8 are connected with 51 pin of described modulation module U7.

3., as claimed in claim 1 for the atomic clock module of the Big Dipper/gps time signal communication network time service equipment, it is characterized in that:

Described Weak Signal Detecting Circuit (3), comprises Detection of Weak Signals module U11, demodulation module U12, DDS3 module U13; Wherein:

2 pin of described demodulation module U12,7 pin, 28 pin respectively with 17 pin of described Detection of Weak Signals module U11,5 pin of described DDS3 module U13,35 pin of described A/D module U2 are connected;

1 ~ 4,25 ~ 28 pin of described DDS3 module U13 are connected with 50 ~ 57 pin of described CPU module U1.

4., as claimed in claim 1 for the atomic clock module of the Big Dipper/gps time signal communication network time service equipment, it is characterized in that:

Described atomic clock physical system (4), comprises special quantum physical system module U10; Wherein:

1 pin of described special quantum physical system module U10,2 pin respectively with 21 pin of described amplification module U8,12 pin of described Detection of Weak Signals module U11 are connected.