CN115268533A - Miniature multi-functional time frequency module - Google Patents
Miniature multi-functional time frequency module Download PDFInfo
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- CN115268533A CN115268533A CN202210920614.6A CN202210920614A CN115268533A CN 115268533 A CN115268533 A CN 115268533A CN 202210920614 A CN202210920614 A CN 202210920614A CN 115268533 A CN115268533 A CN 115268533A
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- 230000032683 aging Effects 0.000 claims description 6
- 238000012163 sequencing technique Methods 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
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- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
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- H03B5/04—Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature
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Abstract
The invention discloses a miniature multifunctional time frequency module, which relates to the technical field of timing and has the characteristics of high integration, high internal space consumption and small equipment occupation volume. The miniature multifunctional time frequency module can achieve relatively accurate time service and time keeping through an integrated controller algorithm. Meanwhile, the miniature multifunctional time frequency module is provided with a secondary temperature compensation device, and the influence of temperature change on the output frequency of the constant-temperature crystal oscillator is reduced through secondary temperature compensation. The processor provided with the algorithm for calculating the frequency adjustment value adjusts the output frequency through the adjustment value, so that the output frequency is more accurate.
Description
Technical Field
The invention relates to the technical field of timing, in particular to a miniature multifunctional time frequency module.
Background
In the application scenario of 4G/5G, as the communication data rate is continuously increased, the clock synchronization precision between each base station device is required to be higher and higher, and the retention capability needs to be provided for a certain time without external reference. It is necessary for the base station device to simultaneously receive the GPS/BDS signal, maintain the time, and support the reference clock signal provided by the PTP protocol layer. The traditional scheme generally adopts three devices to complete the functions together, so that the product has larger occupied volume and cannot be applied to small equipment; on the other hand, different devices may come from different manufacturers, and integrated products produced by using the devices need to be checked and can be put into use after being qualified, so that the production time and the cost are increased.
Disclosure of Invention
The invention aims to provide a miniature multifunctional time frequency module, which adopts a high-integration mode to enable equipment to simultaneously have three functions of receiving GPS/BDS signals, time holding capacity and supporting reference clock signals provided by a PTP protocol layer, reduces the inspection process of integrated products and reduces the production cost. Meanwhile, the volume of the equipment is further reduced, and the requirement of small equipment can be met.
In order to realize the purpose, the invention adopts the following technical scheme:
a miniature multi-functional time-frequency module includes a satellite receiver, a time keeping device, and a controller. The satellite receiver is used for receiving satellite signals, converting the received satellite signals into receiving information and transmitting the receiving information to the controller; the controller is used for receiving the received information and the first signal, controlling the power on-off of the satellite receiver, and taming and adjusting the time keeping equipment; the time keeping device is used for outputting a first signal with a preset frequency. The controller, the satellite receiver and the time keeping device further reduce the volume of the miniature multifunctional time frequency module in a highly integrated mode. The satellite receiver receives satellite signals, the satellite signals are transmitted to the controller after being resolved, and the controller adjusts the output frequency of the time keeping equipment to complete the time service process; the controller enables the time keeping equipment to continuously output signals with a certain frequency by disciplining the time keeping equipment, so that the accuracy of time is kept, and the time keeping function is completed.
Preferably, a satellite antenna is connected to the satellite receiver. The satellite antenna is used for receiving satellite signals, transmitting information to the satellite receiver after receiving the satellite signals, and the satellite receiver processes the information.
Preferably, the time keeping device is a constant temperature crystal oscillator. The constant temperature crystal oscillator has excellent short-term frequency stability and phase noise characteristics, and can continuously output stable frequency signals.
Preferably, the controller is a single chip microcomputer. The single chip microcomputer has the advantages of high integration level, small size, high reliability, strong control capability, low loss and the like, and the controller of the miniature multifunctional time frequency module can further reduce the size by adopting the single chip microcomputer.
Preferably, the miniature multifunctional time frequency module further comprises a bottom plate and an upper plate, the time keeping device and the controller are fixed on the bottom plate, the controller is connected with the time keeping device, the upper plate is located above the bottom plate, the satellite receiver is fixed on the upper plate, the upper plate is fixed with a first connector, the bottom plate is fixed with a second connector matched with the first connector, and the controller is connected with the satellite receiver through the first connector and the second connector. Through the design mode of range upon range of formula, the high multiplexing of inner space makes the occupation volume of integrated product little.
Furthermore, the miniature multifunctional time frequency module is also provided with a secondary temperature compensation device of a constant-temperature crystal oscillator. The constant-temperature crystal oscillator secondary temperature compensation device comprises a temperature measuring device, a temperature compensation device and a frequency adjusting device. The temperature measuring device is used for measuring the surface temperature and the internal temperature of the constant-temperature crystal oscillator; the temperature compensation device is used for controlling the surface temperature of the constant-temperature crystal oscillator, when the surface temperature of the constant-temperature crystal oscillator is reduced, the temperature compensation device heats the constant-temperature crystal oscillator, and when the surface temperature of the constant-temperature crystal oscillator is increased, the temperature compensation device consumes heat of the constant-temperature crystal oscillator, so that the temperature change of the constant-temperature crystal oscillator is reduced; the frequency adjusting device is used for calculating a frequency adjusting value of the output pulse signal according to the temperature in the constant-temperature crystal oscillator, adjusting the output frequency of the constant-temperature crystal oscillator through the frequency adjusting value and reducing the influence of the temperature on the output frequency of the constant-temperature crystal oscillator.
Furthermore, the temperature measuring device is divided into a constant-temperature crystal oscillator internal temperature measuring module and a constant-temperature crystal oscillator surface temperature measuring module. The calculation principle is that an internal temperature control circuit of the constant temperature crystal oscillator heats the inside of the constant temperature crystal oscillator through heating, and when the temperature is low, more current is needed, so that an indirect numerical value of the internal temperature can be obtained through measurement and calculation; and the constant-temperature crystal oscillator surface temperature measurement module acquires a second temperature on the surface of the constant-temperature crystal oscillator by adopting a temperature sensor.
Further, the secondary temperature compensation device is provided with a temperature control component and a control component, and the control component is used for controlling the temperature of the temperature control component to rise or fall according to the surface temperature of the current constant-temperature crystal oscillator. When the outside temperature is reduced, the control part controls the temperature control part to heat, so that the surface temperature of the constant temperature crystal oscillator is increased; when the external temperature rises, the control part controls the temperature control part to consume heat, so that the surface temperature of the constant-temperature crystal oscillator is reduced, the temperature change of the constant-temperature crystal oscillator is reduced, the temperature of the constant-temperature crystal oscillator tends to be constant, and the output frequency of the constant-temperature crystal oscillator is kept stable. Because the temperature variation range of the constant-temperature crystal oscillator body is reduced, the frequency output is more stable; meanwhile, due to the existence of the secondary temperature compensation device, the influence of external temperature impact on the internal constant-temperature crystal oscillator is greatly reduced, the condition that the output frequency changes suddenly along with the temperature is also reduced, and the measurement error is reduced.
Further, the domestication method of the constant temperature crystal oscillator of the miniature multifunctional time frequency module comprises the following steps:
step 1: the miniature multifunctional time frequency module is powered on and starts to work;
and 2, step: after receiving the satellite signal, the satellite receiver calculates time information and a pulse signal, and sends the time information and the pulse signal to the controller;
and step 3: the controller receives the time information and the pulse signal, controls the input clock frequency of the time keeping equipment, and taminates and adjusts the time keeping equipment;
and 4, step 4: the time keeping equipment outputs a pulse signal after being acclimated and adjusted to complete the time service function;
and 5: after the time service function is finished, the controller judges whether a satellite antenna connected with the satellite receiver is connected with a satellite signal;
and 6: if the satellite antenna is connected with the satellite signal, executing the step 2; otherwise, executing step 7;
and 7: the controller cuts off the power supply of the satellite receiver;
and step 8: the controller enables the time keeping equipment to continuously output pulse signals by taming and adjusting the time keeping equipment to complete the time keeping function;
and step 9: the controller judges whether the satellite antenna is connected with the satellite signal, if the satellite antenna is connected with the satellite signal, the step 10 is executed; otherwise, executing step 8;
step 10: the controller turns on the power of the satellite receiver and performs step 2.
According to the method, the satellite signal received by the satellite receiver is resolved and then transmitted to the controller, the controller adjusts the time keeping equipment according to the transmitted information, the output of the time keeping equipment is calibrated, and the time service function is completed; when the satellite receiver can not receive the satellite signal, the satellite receiver is turned off, the power consumption is reduced, the controller disciplines the time keeping equipment, the time keeping equipment can continuously output stable pulse signals, the time keeping function is completed, and the accuracy of time is kept. When the satellite antenna can receive the satellite signal, the controller turns on the power supply of the satellite receiver to enable the satellite receiver to work again, and the time service function is started to be executed. By the method, the time service function of the miniature multifunctional time frequency module can be completed when the miniature multifunctional time frequency module can be connected with a satellite signal, the time keeping function can be completed when the satellite signal cannot be connected or disconnected, the time accuracy can be kept in any time period, and the satellite receiver can be turned off when the miniature multifunctional time frequency module cannot be connected with the satellite signal, so that the consumption of electric quantity is reduced.
Further, the method for calculating the temperature compensation frequency adjustment value of the constant temperature crystal oscillator comprises the following steps:
step 1: starting a temperature compensation device of the constant-temperature crystal oscillator;
and 2, step: acquiring the temperature in the constant temperature crystal oscillator, wherein the temperature and the first frequency adjustment value are in a one-to-one correspondence relationship, acquiring the first frequency adjustment value according to the temperature, and executing the step 3 if the corresponding first frequency adjustment value does not exist; otherwise, obtaining a second frequency adjustment value based on the first frequency adjustment value, and then executing step 8;
and 3, step 3: reading the recorded temperature and adjustment value information from the memory;
and 4, step 4: sequencing the read information according to the temperature;
and 5: screening the temperature distribution intervals, sequencing the screening results according to time to obtain a time-frequency adjustment value curve, and calculating by using a least square method to obtain an aging curve;
step 6: substituting the time into the aging curve to obtain a change amount, and calculating a second frequency adjustment value according to the change amount and the first frequency adjustment value;
and 7: fitting a temperature curve to the screening result, judging the effectiveness of the second frequency adjustment value according to the fitting result, and executing the step 8 if the effectiveness is judged; otherwise, the second frequency is 0, and step 9 is executed;
and 8: storing the temperature, the second adjustment value and the time into a memory;
and step 9: and outputting a second adjustment value.
According to the method, the temperature in the constant-temperature crystal oscillator is obtained, the corresponding frequency adjustment value is obtained according to the temperature, the output frequency of the constant-temperature crystal oscillator is adjusted through the frequency adjustment value, the influence of temperature change on the output frequency of the constant-temperature crystal oscillator is reduced, the output frequency of the constant-temperature crystal oscillator tends to be stable, the time keeping is more accurate, the time offset is reduced, and the micro multifunctional time frequency module can keep more accurate time even under the condition that the micro multifunctional time frequency module cannot be connected to satellite signals for a long time. When the micro multifunctional time frequency module can receive satellite signals and has an external reference clock, the method can be continuously executed, and the temperature, the frequency adjustment value and the time are continuously stored in the memory; when the micro multifunctional time frequency module cuts off satellite signals and does not have an external reference clock, the method can be executed once, and temperature, frequency adjustment values and time information are recorded into the memory once.
One or more technical schemes provided by the invention at least have the following technical effects or advantages:
the invention provides a miniature multifunctional time frequency module. The miniature multifunctional time frequency module has the characteristic of high integration, the internal space is highly multiplexed, and the occupied volume of equipment is small. The miniature multifunctional time frequency module can achieve relatively accurate time service and timekeeping through an integrated processor algorithm. Meanwhile, the miniature multifunctional time frequency module is provided with a secondary temperature compensation device, and the influence of temperature change on the output frequency of the constant temperature crystal oscillator is reduced through secondary temperature compensation. The processor provided with the algorithm for calculating the frequency adjustment value adjusts the output frequency through the adjustment value, so that the output frequency is more accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a block diagram of the present invention in a miniature multi-function time-frequency module;
FIG. 2 is a schematic diagram of a miniature multi-functional time-frequency module according to the present invention;
FIG. 3 is a schematic view of an upper plate according to the present invention;
FIG. 4 is a schematic diagram of a miniature multi-functional time-frequency module with a shield according to the present invention;
FIG. 5 is a schematic view of a base plate according to the present invention;
FIG. 6 is a block diagram of the temperature compensation device of the present invention;
FIG. 7 is a flowchart of a method for taming a constant temperature crystal oscillator according to the present invention;
FIG. 8 is a flow chart of a method for calculating a secondary temperature compensation frequency adjustment value of the constant temperature crystal oscillator according to the present invention;
the system comprises a satellite receiver 1, an upper plate 2, a bottom plate 3, a time keeping device 4, a controller 5, a first connector 6, a second connector 7, a shielding cover 8 and a through hole 9.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Example one
Referring to fig. 1, the present invention provides a micro multi-function time-frequency module, which comprises a satellite receiver 1, a controller 5 and a time keeping device 4, wherein the controller is connected with the receiver and the time keeping device. When the satellite receiver receives the satellite signal, the satellite signal is converted into information to be transmitted to the controller. After receiving the information, the controller adjusts the time keeping equipment through the information to enable the time keeping equipment to continuously output pulse signals so as to complete the time service function; after the satellite receiver disconnects the satellite signal, the controller enables the satellite receiver to stably output the pulse signal by disciplining the time keeping equipment, so that the accuracy of time is kept, and the time keeping function is completed. The time keeping device can be a voltage-controlled oscillator, a temperature compensation crystal oscillator or a constant temperature crystal oscillator, the controller can be a single chip microcomputer or a programmable logic controller, the first connector and the second connector are matched with each other, the types of the first connector and the second connector are respectively MMCX-JD2 and MMCX-KE, and can also be connectors of other types.
Example two
Referring to fig. 2, an embodiment of the present invention provides a micro multi-functional time-frequency module, which includes a satellite receiver 1, a controller 5, a time keeping device 4, an upper board 2, a bottom board 3, a first connector 6, and a second connector 7. Please refer to fig. 5, wherein the controller 5, the time keeping device 4 and the second connector 7 are fixed on the bottom plate 3, the upper plate 2 is located above the bottom plate 3, refer to fig. 3, the satellite receiver 1 and the first connector 6 are fixed on the upper plate 2, the controller 5 is connected with the time keeping device 4, and the controller 5 is connected with the satellite receiver 1 through the first connector 6 and the second connector 7. When the satellite receiver receives the satellite signal, the satellite signal is converted into information which is transmitted to the controller through the first connector and the second connector. After receiving the information, the controller adjusts the output frequency of the time keeping equipment through the information to enable the time keeping equipment to continuously output pulse signals, and the time service function is completed; after the satellite receiver cuts off the satellite signal, the controller enables the satellite receiver to stably output the pulse signal by disciplining the time keeping equipment, so that the accuracy of time is kept, and the time keeping function is completed. The time keeping device may be a voltage-controlled oscillator, a temperature compensation crystal oscillator or a constant temperature crystal oscillator, the controller may be a single chip microcomputer or a programmable logic controller, the first connector and the second connector are matched with each other, the first connector and the second connector may be an MMCX-JD2 connector, an MMCX-KE connector, or other types of connectors, the second embodiment of the present invention does not specifically limit the type of the connector, the number of the first connector and the second connector may be one or more pairs, the information is the position, height, speed and time information of the micro multifunctional time frequency module, and the frequency of the pulse signal is 1PPS.
EXAMPLE III
Referring to fig. 4, the present invention provides a micro multi-functional time frequency module, which is further provided with a shielding cover 8 based on the first embodiment. The shield case 8 is a means for shielding electronic signals from the influence of external electromagnetic waves on internal circuits and from electromagnetic waves generated inside to be radiated to the outside. The shield cover 8 is cuboid shape, and the shield cover 8 bottom is fixed on bottom plate 3, the shield cover 8 can be that the stainless steel, foreign white copper, tin bronze, brass, material such as tinplate constitute, and the fixed mode that the shield cover 8 was fixed on the bottom plate can be welding, threaded connection, joggle.
Example four
The invention provides a miniature multifunctional time frequency module, and on the basis of the second embodiment, a through hole 9 is further formed in a shielding cover 8. The through holes are formed in the shielding cover for heat dissipation, and meanwhile, the temperature difference between the inside and the outside of the shielding cover can be reduced. If the shielding case is not provided with the opening, the temperature may be too high during reflow soldering, so that the shielding case is cracked, and the internal devices are damaged.
EXAMPLE five
The invention provides a miniature multifunctional time frequency module, which is further provided with a secondary temperature compensation device on the basis of the first embodiment, wherein the secondary temperature compensation device comprises a temperature measurement device, a temperature compensation device and a frequency adjustment device. The temperature measuring device is used for measuring the temperature inside and on the surface of the constant temperature crystal oscillator, the method for measuring the temperature inside the constant temperature crystal oscillator can be directly measuring by using a temperature sensor or indirectly measuring, and the internal temperature of the constant temperature crystal oscillator is calculated by measuring the resistance value of a negative temperature coefficient thermistor inside the constant temperature crystal oscillator and the resistance value. The method for measuring the resistance value of the ntc thermistor can be calculated by acquiring the voltage across the ntc thermistor and the current passing through the ntc thermistor, or can be calculated by connecting the ntc thermistor to a bridge. Referring to fig. 6, the temperature compensation device is used for keeping the temperature of the constant temperature crystal oscillator constant and reducing the temperature fluctuation of the constant temperature crystal oscillator, and the temperature compensation device is provided with a temperature control component and a control component, wherein the control component controls the temperature control component to heat when the external temperature is reduced, and the control component controls the temperature control component to reduce or close the heat productivity of the temperature control component and reduce the temperature variation of the constant temperature crystal oscillator when the external temperature is increased, so that the output frequency of the constant temperature crystal oscillator is kept stable. The temperature control component is a resistance type heating wire. The frequency adjusting device adjusts the frequency of the pulse signal output by the constant-temperature crystal oscillator through acquiring the internal temperature of the current constant-temperature crystal oscillator and different temperatures, so that the constant-temperature crystal oscillator outputs a stable pulse signal. The pulse signal is a frequency signal of 1PPS.
EXAMPLE six
Referring to fig. 7, the present invention provides a micro multi-functional time-frequency module based on the first embodiment, and the taming method of the constant temperature crystal oscillator of the micro multi-functional time-frequency module includes the following steps:
step 1: the miniature multifunctional time frequency module is powered on and starts to work;
and 2, step: after receiving the satellite signal, the satellite receiver calculates time information and a pulse signal and sends the time information and the pulse signal to the controller;
and step 3: the controller receives the time information and the pulse signal, controls the input clock frequency of the time keeping equipment, and taminates and adjusts the time keeping equipment;
and 4, step 4: the time keeping equipment outputs a pulse signal after being acclimated and adjusted to complete the time service function;
and 5: after the time service function is finished, the controller judges whether a satellite antenna connected with the satellite receiver is connected with a satellite signal or not;
step 6: if the satellite antenna is connected with the satellite signal, executing the step 2; otherwise, executing step 7;
and 7: the controller cuts off the power supply of the satellite receiver;
and 8: the controller enables the time keeping equipment to continuously output pulse signals by taming and adjusting the time keeping equipment to complete the time keeping function;
and step 9: the controller judges whether the satellite antenna is connected with the satellite signal, if the satellite antenna is connected with the satellite signal, the step 10 is executed; otherwise, executing step 8;
step 10: the controller turns on the power of the satellite receiver and performs step 2.
EXAMPLE seven
Referring to fig. 8, the present invention provides a micro multi-functional time frequency module based on the first embodiment, and the steps of the method for calculating the temperature compensation frequency adjustment value of the constant temperature crystal oscillator of the micro multi-functional time frequency module are as follows:
step 1: starting a temperature compensation device of the constant-temperature crystal oscillator;
step 2: acquiring the temperature in the constant temperature crystal oscillator, wherein the temperature and the first frequency adjustment value are in a one-to-one correspondence relationship, acquiring the first frequency adjustment value according to the temperature, and executing the step 3 if the corresponding first frequency adjustment value does not exist; otherwise, obtaining a second frequency adjustment value based on the first frequency adjustment value, and then executing step 8;
and step 3: reading recorded temperature and adjustment value information from a memory;
and 4, step 4: sequencing the read information according to the temperature;
and 5: screening the temperature distribution interval, sequencing the screening results according to time to obtain a time-frequency adjustment value curve, and calculating by a least square method to obtain an aging curve;
step 6: substituting the time into the aging curve to obtain a change amount, and calculating a second frequency adjustment value according to the change amount and the first frequency adjustment value;
and 7: fitting a temperature curve to the screening result, judging the validity of the second frequency adjustment value according to the fitting result, and executing the step 8 if the validity is judged; otherwise, the second frequency adjustment value is 0, and step 9 is executed; if the fitting is successful, the second frequency adjustment value is effective, and the adjustment value is output and stored; if the fitting is unsuccessful, the output frequency is not adjusted, namely the output adjustment value is 0;
and 8: storing the temperature and the second adjustment value into a memory;
and step 9: and outputting a second adjustment value.
Example eight
On the basis of the first embodiment, the invention provides a miniature multifunctional time-frequency module, the model of a satellite receiver is T303-3, the controller is a single chip microcomputer, the model of the single chip microcomputer is GD32F405VGH6, the time keeping unit is a constant-temperature crystal oscillator, the model of the constant-temperature crystal oscillator is SIT5721AI-KW333-T-20.000000, the volume of the miniature multifunctional time-frequency module is smaller due to the satellite receiver, the controller, the time keeping equipment and the stacked design, and the volume of the miniature multifunctional time-frequency module is 17 x 22 x 12mm.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A miniature multifunction time-frequency module, comprising:
the satellite receiver is used for receiving satellite signals, converting the satellite signals into receiving information and transmitting the receiving information to the controller;
a time keeping device for outputting a first signal of a preset frequency;
a controller for receiving said received information and receiving said first signal, for controlling the power on-off of said satellite receiver, and for disciplining and adjusting said time keeping apparatus;
the controller disciplines and adjusts the time keeping equipment according to the received information, and the time keeping equipment outputs signals.
2. The miniature multi-functional time-frequency module of claim 1, wherein a satellite antenna is connected to said satellite receiver.
3. The multifunctional miniature time-frequency module of claim 1 wherein said time keeping device is a crystal oven.
4. The miniature multi-functional time-frequency module of claim 1, wherein said controller is a single chip microcomputer.
5. The miniature multi-function time frequency module of claim 1 further comprising a bottom plate and a top plate, said time keeping device and said controller being secured to said bottom plate, said controller being connected to said time keeping device, said top plate being positioned above said bottom plate, said satellite receiver being secured to said top plate, said top plate being secured to a first connector, said bottom plate being secured to a second connector mating with said first connector, said controller being connected to said satellite receiver through said first connector and said second connector.
6. The miniature multifunctional time-frequency module as claimed in claim 3, wherein said method for taming a crystal oscillator at constant temperature comprises the steps of:
step 1: the miniature multifunctional time frequency module is powered on and starts to work;
and 2, step: after receiving the satellite signal, the satellite receiver calculates time information and a pulse signal and sends the time information and the pulse signal to the controller;
and step 3: the controller receives the time information and the pulse signal, controls the input clock frequency of the time keeping equipment, and taminates and adjusts the time keeping equipment;
and 4, step 4: the time keeping equipment outputs a pulse signal after being acclimated and adjusted to complete the time service function;
and 5: after the time service function is finished, the controller judges whether a satellite antenna connected with the satellite receiver is connected with a satellite signal;
and 6: if the satellite antenna is connected with the satellite signal, executing the step 2; otherwise, executing step 7;
and 7: the controller cuts off the power supply of the satellite receiver;
and step 8: the controller enables the time keeping equipment to continuously output pulse signals by taming and adjusting the time keeping equipment to complete the time keeping function;
and step 9: the controller judges whether the satellite antenna is connected with the satellite signal, if the satellite antenna is connected with the satellite signal, the step 10 is executed; otherwise, executing step 8;
step 10: the controller turns on the power of the satellite receiver and performs step 2.
7. The micro multifunctional time frequency module according to claim 3, further comprising a secondary temperature compensation device of a constant temperature crystal oscillator, wherein the secondary temperature compensation device of the constant temperature crystal oscillator comprises:
the temperature measuring device is used for measuring the surface temperature and the internal temperature of the constant-temperature crystal oscillator;
the temperature compensation device is used for controlling the temperature of the surface of the constant-temperature crystal oscillator;
and the frequency adjusting device is used for calculating a frequency adjusting value of the output pulse signal according to the temperature in the constant-temperature crystal oscillator and adjusting the output frequency of the constant-temperature crystal oscillator through the frequency adjusting value.
8. The micro multifunctional time frequency module according to claim 7, wherein the temperature measuring device comprises a constant temperature crystal oscillator internal temperature measuring module and a constant temperature crystal oscillator surface temperature measuring module, the constant temperature crystal oscillator internal temperature measuring module measures a resistance value of a constant temperature crystal oscillator negative temperature coefficient thermistor, and a first temperature inside the constant temperature crystal oscillator is calculated through the resistance value; and the constant-temperature crystal oscillator surface temperature measurement module acquires a second temperature on the surface of the constant-temperature crystal oscillator by adopting a temperature sensor.
9. The miniature multifunctional time-frequency module as claimed in claim 8, wherein the secondary temperature compensation device is provided with a temperature control component and a control component, and the control component is used for controlling the temperature of the temperature control component to be increased or decreased according to the second temperature of the current constant temperature crystal oscillator.
10. The multifunctional miniature time-frequency module as set forth in claim 7, wherein the method for calculating the temperature compensation frequency adjustment value of the constant temperature crystal oscillator comprises the following steps:
step 1: starting a temperature compensation device of the constant-temperature crystal oscillator;
and 2, step: acquiring the temperature in the constant-temperature crystal oscillator, wherein the temperature and the first frequency adjustment value are in a one-to-one correspondence relationship, acquiring the first frequency adjustment value according to the temperature, and executing the step 3 if the corresponding first frequency adjustment value does not exist; otherwise, obtaining a second frequency adjustment value based on the first frequency adjustment value, and then executing step 8;
and step 3: reading the recorded temperature and adjustment value information from the memory;
and 4, step 4: sequencing the read information according to the temperature;
and 5: screening the temperature distribution interval, sequencing the screening results according to time to obtain a time-first frequency adjustment value curve, and calculating by a least square method to obtain an aging curve;
step 6: substituting the time into the aging curve to obtain a change amount, and calculating a second frequency adjustment value according to the change amount and the first frequency adjustment value;
and 7: fitting a temperature curve to the screening result, judging the validity of the second frequency adjustment value according to the fitting result, and executing the step 8 if the validity is judged; otherwise, the second frequency adjustment value is 0, and step 9 is executed;
and step 8: storing the temperature, the second adjustment value and the time into a memory;
and step 9: and outputting a second adjustment value.
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