CN207218667U - A kind of satellite navigation time complexity curve device - Google Patents
A kind of satellite navigation time complexity curve device Download PDFInfo
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- CN207218667U CN207218667U CN201720813656.4U CN201720813656U CN207218667U CN 207218667 U CN207218667 U CN 207218667U CN 201720813656 U CN201720813656 U CN 201720813656U CN 207218667 U CN207218667 U CN 207218667U
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- time complexity
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Abstract
It the utility model is related to atomic clock technical field, more particularly to a kind of satellite navigation time complexity curve device, VCXO is connected including temperature control module, VCXO connects DDS frequency division modules, voltage-controlled correcting module, gain control module and conventional electronics respectively, conventional electronics connect quantized system, voltage-controlled correcting module connects servo circuit, DDS frequency division modules connection accumulation of phase module, accumulation of phase module connection gps signal receiver；Gain control module is connected with voltage-controlled correcting module, and quantized system is sequentially connected servo circuit, accumulation of phase module.Signal frequency after correcting device frequency dividing is consistent with synchronous reference signal frequency, the detection of same frequency out of phase is realized, to improve accuracy of detection.
Description
Technical field
The utility model belongs to atomic clock technical field, more particularly to a kind of satellite navigation time complexity curve device.
Background technology
In passive Rb time service equipment, quantized system is the core component of whole time service equipment, and it is steady that it provides a frequency
Atomic resonance Absorption Line fixed, line width is narrower.After comprehensive modulate, voltage-controlled quartz oscillator is come from caused by electronic circuit
(VCXO) the microwave interrogation signals of band modulation act on quantized system, and after quantum frequency discrimination, quantum is reflected by servo circuit
The processing of frequency information, most the output frequency of local oscillator is locked in the hyperfine 0-0 transition centers frequency of ground state of rubidium atom at last.
Existing most of servo circuits synchronize phase demodulation to quantum frequency discrimination signal according to the comprehensive synchronous phase discrimination signal provided, and according to
Identified result information realizes that the closed loop of complete machine locks by the way of the independent voltage-controlled local oscillators of D/A, is exported eventually through local oscillator
The higher frequency signal of stability.It is that there is provided a new dance to existing atomic clock with the popularization of GPS synchronous calibrations
Platform, it is the longtime running index of atomic clock is synchronous with GPS, and short run target retains prior art, can thus avoid due to
The output signal frequency change that complete machine drift caused by internal system reason is brought.
Utility model content
It is consistent with synchronous reference signal frequency that the purpose of this utility model is to provide a kind of signal frequency made after frequency dividing
Correcting device, the detection of same frequency out of phase is realized, to improve accuracy of detection.
To achieve the above object, the technical solution adopted in the utility model is：A kind of satellite navigation time complexity curve device, bag
Include temperature control module connection VCXO, VCXO and connect DDS frequency division modules, voltage-controlled correcting module, gain control module and tradition electricity respectively
Sub-line road, conventional electronics connection quantized system, voltage-controlled correcting module connect servo circuit, DDS frequency division modules connection phase
Accumulate module, accumulation of phase module connection gps signal receiver；Gain control module is connected with voltage-controlled correcting module, quantum system
System is sequentially connected servo circuit, accumulation of phase module.
In above-mentioned satellite navigation time complexity curve device, DDS frequency division modules include isolated amplifier, walk hour counter,
Latch, DDS processing modules, low-pass filtering module and single-chip microcomputer；Isolated amplifier connects away hour counter, DDS processing respectively
Module, walk hour counter connection latch, latch connection single-chip microcomputer；DDS processing modules connect single-chip microcomputer and low pass filtered respectively
Ripple module.
In above-mentioned satellite navigation time complexity curve device, DDS processing modules use AD9852.
In above-mentioned satellite navigation time complexity curve device, temperature control module includes voltage source, temperature collect module, difference and put
Big device A, negative feedback resistor Rw and heating coil loop；Temperature collect module connects voltage source and difference amplifier A, difference respectively
Amplifier A connects negative feedback resistor Rw, heating coil loop and voltage source respectively.
In above-mentioned satellite navigation time complexity curve device, temperature collect module includes two resistance R, resistance R1 and resistance
The electric bridge of Rk compositions；And two resistance R and resistance R1 are the resistance with identical temperature coefficient, its resistance and resistance Rk phases
When；Resistance Rk is thermistor, and is affixed on the surface of temperature control modules.
In above-mentioned satellite navigation time complexity curve device, resistance Rw uses digital potentiometer.
In above-mentioned satellite navigation time complexity curve device, temperature control module is placed in VCXO.
In above-mentioned satellite navigation time complexity curve device, voltage-controlled correcting module includes electronic bridge measurement module, voltage follow
Device A1, A2, difference amplifier A3；Electronic bridge measurement module includes two resistance R4, resistance R0With resistance Rk1 form electric bridge, two
Resistance R4 and resistance R0It is suitable with resistance Rk1 for the resistance with identical temperature coefficient, its resistance.
In above-mentioned satellite navigation time complexity curve device, gain control module is that gain linearity adjusts circuit A4；With difference
Divide amplifier A3 output end connection.
In above-mentioned satellite navigation time complexity curve device, resistance Rk1 is thermistor, resistance R0Sensed for thermistor
Device.
The beneficial effects of the utility model are：The signal frequency after frequency dividing can be made consistent with synchronous reference signal frequency, it is real
Now with the detection of frequency out of phase, to improve accuracy of detection.Avoid because complete machine drift is brought caused by internal system reason
Output signal frequency change.
Brief description of the drawings
Fig. 1 is the utility model one embodiment satellite navigation time complexity curve schematic diagram of device；
Fig. 2 is the utility model one embodiment DDS frequency division module schematic diagrams；
Fig. 3 is the utility model one embodiment accumulation of phase module timing diagram；
Fig. 4 is that the utility model one embodiment conventional atom clock and satellite navigation time complexity curve device output frequency are bent
Line；
Fig. 5 is the utility model one embodiment temperature control module schematic diagram；
Fig. 6 is the voltage-controlled correcting module of the utility model one embodiment and gain control module schematic diagram.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.
The example of the embodiment is shown in the drawings, wherein same or similar label represents identical or class from beginning to end
As element or with same or like function element.The embodiments described below with reference to the accompanying drawings are exemplary, only
For explaining the utility model, and can not be construed to limitation of the present utility model.
Following disclosure provides many different embodiments or example is used for realizing different structure of the present utility model.For
Simplify disclosure of the present utility model, hereinafter the part and setting of specific examples are described.They are only example, and
And purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals and/or word
It is female.This repetition is for purposes of simplicity and clarity, between itself not indicating discussed various embodiments and/or setting
Relation.In addition, the utility model provides the example of various specific techniques and material, but those of ordinary skill in the art can
To recognize the use of the applicability of other techniques and/or other materials.In addition, fisrt feature described below is special second
Levy it " on " structure can include the first and second features and be formed as the embodiment that directly contacts, other spy can also be included
The embodiment that sign is formed between the first and second features, such first and second feature may not be direct contact.
, it is necessary to which explanation, unless otherwise prescribed and is limited, term " connected " " connection " should in description of the present utility model
It is interpreted broadly, for example, it may be mechanical connection or electrical connection or the connection of two element internals, can be direct
It is connected, can also be indirectly connected by intermediary, can be according to specific feelings for those of ordinary skill in the related art
Condition understands the concrete meaning of above-mentioned term.
The present embodiment realized using following technical scheme, a kind of satellite navigation time complexity curve device, including temperature control module
VCXO is connected, VCXO connects DDS frequency division modules, voltage-controlled correcting module, gain control module and conventional electronics respectively, tradition
Electronic circuit connects quantized system, and voltage-controlled correcting module connects servo circuit, DDS frequency division modules connection accumulation of phase module, phase
Position accumulation module connection gps signal receiver；Gain control module is connected with voltage-controlled correcting module, and quantized system, which is sequentially connected, to be watched
Take circuit, accumulation of phase module.
Further, DDS frequency division modules include isolated amplifier, walk hour counter, latch, DDS processing modules, low pass filtered
Ripple module and single-chip microcomputer；Isolated amplifier connects away hour counter, DDS processing modules respectively, walks hour counter connection latch,
Latch connects single-chip microcomputer；DDS processing modules connect single-chip microcomputer and low-pass filtering module respectively.
Further, DDS processing modules use AD9852.
Further, temperature control module includes voltage source, temperature collect module, difference amplifier A, negative feedback resistor Rw and heating
Coil loop；Temperature collect module connects voltage source and difference amplifier A respectively, and difference amplifier A connects negative-feedback electricity respectively
Hinder Rw, heating coil loop and voltage source.
Further, temperature collect module includes the electric bridge that two resistance R, resistance R1 and resistance Rk are formed；And two resistance R
And resistance R1 is the resistance with identical temperature coefficient, its resistance is suitable with resistance Rk；Resistance Rk is thermistor, and is affixed on
The surface of temperature control modules.
Further, resistance Rw uses digital potentiometer.
Further, temperature control module is placed in VCXO.
Further, voltage-controlled correcting module includes electronic bridge measurement module, voltage follower A1, A2, difference amplifier A3；Electric bridge
Temperature measurement module includes two resistance R4, resistance R0Electric bridge, two resistance R4 and resistance R are formed with resistance Rk10For with identical
The resistance of temperature coefficient, its resistance are suitable with resistance Rk1.
Further, gain control module is that gain linearity adjusts circuit A4；It is connected with difference amplifier A3 output end.
Further, resistance Rk1 is thermistor, resistance R0For thermistor (temperature) sensor.
When it is implemented, as shown in figure 1, the signal that receiver acquisition gps satellite is sent, obtains second arteries and veins after converted processing
Rush signal f0 to deliver in accumulation of phase module, and the synchronous reference signal f1 based on GPS second pulse signal generation 1KHz is also sent
Into accumulation of phase module；While VCXO output signal obtains f2 after DDS frequency division modules and delivered in accumulation of phase module.
Here we are provided with DDS frequency dividing ratio, and final target is to make the signal frequency and synchronous reference signal f1 frequencies after frequency dividing
Unanimously.
Wish f1=f2 in theory, the detection of same frequency out of phase is so can be achieved with, to improve accuracy of detection.But
It it is practically impossible to make both identical, such as f1=1.0012KHz, f2=1.0023KHz.Using in accumulation of phase mould
DDS frequency division modules structure as shown in Figure 2 is set in block come make f1 and f2 numerical value as close possible to.
Tested frequency signal fx(f1 or f2) delivers to away hour counter and DDS processing moulds respectively after isolated amplifier
Block.Deliver to away hour counter and carry out coarse frequency measurement, after single-chip microcomputer reads numerical value of the latch to walking hour counter sampling, record
Under frequency values now, the coarse frequency value F of measured signal can be obtained.Another way passes through the measured signal quilt of isolated amplifier
Deliver to DDS external clock input, reference clock when being worked as DDS.DDS external communication port is connected to list simultaneously
The frequency dividing numerical value with DDS communications is calculated according to existing DDS treatment technologies for piece machine, single-chip microcomputer；DDS uses AD9852, it
There are 48 bit frequency control word registers：Wherein F is by walking the tested letter that hour counter counts, single-chip microcomputer computing obtains
Number coarse frequency value, f takes 1KHz, and writes DDS buffer areas, warp as specific frequency dividing numerical value of the serial communication sequential by obtained by
1KHz frequency signal is obtained after DDS, the frequency signal of gained is delivered to after low-pass filtering module again and obtains final 1KHz frequencies
Rate signal output.
By the correcting device shown in Fig. 2, f1=f2=1KHz is can obtain in theory.
As shown in figure 3, the sequential of the specific processing method of accumulation of phase module.
GPS second pulse gate signal f0, width are the T=1 seconds；In high level, after the t1 times, VCXO fractional frequency signal
The rising edge of f2 (1KHz) first pulse, makes accumulation of phase effective, referring initially to signal f1 and VCXO fractional frequency signals phase
Difference accumulation calculates.After the T seconds, when GPS second pulse gate high level arrives again, after the t2 times, arrive when then
When the rising edge of VCXO frequency signals arrives, the phase difference accumulation calculating process of reference signal f1 and VCXO fractional frequency signals is held always
It is continuous；And the servo circuit shown in Fig. 1 records the specific number of reference signal f1 and VCXO fractional frequency signals f2 phase difference always
It is worth Δ φ, Δ φ information is judged by servo circuit at this moment.Here the time of enable signal (actual signal strobe) is wide
Degree, exactly equal to the complete cycle number (N) of VCXO frequency signals.
As shown in figure 3, GPS second pulse f0 frequency is 1Hz, i.e. T=1 seconds, can be seen that from above-mentioned principle：According to each
The interval of individual T=1 seconds carries out a f1 and f2 phase difference Δs φ.When after the sampling of M T=1 second, now during Δ φ=0,
Corresponding to so servo module obtains the phase difference data obtained in the M*T times according to traditional " phase difference-frequency difference " replacement theory
The frequency difference DELTA f of f1 and f2 signals, servo module will transform into Δ f according to VCXO " voltage-controlled slope " relation shown in Fig. 1
Δ V (direct current correction magnitude of voltage) enables the voltage-controlled correcting module style of work in VCXO.
As shown in figure 1, selecting corresponding VCXO voltage-controlled slope value, 1E-7/V is such as selected, selects aging drift rate smaller
VCXO, such as：In -1E-6/ years, obtained by conversion in 365 days 1 year:- 2.7E-9/ days.
As shown in figure 4, wherein curved portion (atomic clock output) expression be conventional atom clock technology obtain one into
The frequency sampling curve of type atomic clock.Be can be seen that from Fig. 4 curved portions in whole sampling process, atomic clock output have compared with
Big fluctuation point：The frequency fluctuation upper limit, frequency fluctuation lower limit.This requires harsh occasion, example for some to frequency absolute value
If guided missile precise guidance, GPS precision navigations etc. are extremely disadvantageous.The new atomic clock obtained using the present embodiment device is by atom
Clock output frequency is compressed in the range of the desired value square frame shown in Fig. 4.Specific embodiment is as follows：
Shown in Fig. 1, internal record VCXO voltage-controlled slope data, and set up the relation of " voltage-frequency ", realize
Desired value f shown in Fig. 4H,fLScope, servo record corresponding magnitude of voltage V1, V2.It is assumed that at a time servo circuit conveys
Magnitude of voltage to voltage-controlled correcting module is Vo, and by existing atomic clock technology, quantum correction voltage Δ V is obtained at quantized system,
Now, servo judges corresponding V=V0± Δ V values whether in the range of V1, V2, (1) if, (V not in this range>V1
Or V<V2), then now servo keeps magnitude of voltage Vo to voltage-controlled correcting module；(2) if there is (V2<V<V1), then now servo by electricity
Pressure V values are delivered to voltage-controlled correcting module.It is achieved thereby that the control of atomic clock output frequency is in the desired value square frame shown in Fig. 4.
With reference to the VCXO aging drift data of selection：The voltage-controlled slope value in -2.7E-9/ days and VCXO：1E-7/V, watch
Circuit is taken according to carrying out corresponding main modulation to correction voltage V daily, i.e., the correction voltage V per angel, fixed is repaiied plus one
On the occasion of such as：27mV, then cause VCXO output frequencies to increase 1E-7/V × 27mV=+-2.7E-9 accordingly, can so compensate
Branch VCXO is because frequency change influences caused by aging drift.
Temperature Controlling Chip (temperature control use) and thermistor (thermometric use) are contained in temperature control modules, the inside.By central processing
Device control can be with set temperature value T, because whole temperature control modules are placed in VCXO (temperature control module), so central processing unit
Corresponding operating ambient temperature can be set and obtain actual operating ambient temperature information.Its principle is as shown in Figure 5.Its
In two R and R1 be the resistance with identical temperature coefficient, its resistance should select suitable with Rk.Here R1 value reflects
Actual working environment temperature T.Rk is a thermistor, and it is affixed on the surface of temperature control module, to perceive actual building ring
Border temperature T.Therefore when operating ambient temperature T is unchanged, electric bridge is in balance in upper figure, is delivered to the temperature of heating coil loop
Offset voltage value is 0.Once operating ambient temperature T changes, then thermistor Rk resistance will diminish (temperature rise) or
Become big (temperature reduction), then electric bridge both ends have voltage difference, are changed into temperature-compensated voltage after operational amplifier A differential amplification
Voltage source is delivered to, while exports and gives traditional heating wire coil loop.The gain amplifier of whole circuit is by the negative of operational amplifier
Feedback resistance Rw is adjusted, and Rw is a digital potentiometer, changes work(by adjusting Rw resistance to reach foregoing circuit compensating factor
Energy.
As shown in fig. 6, the bridge thermometric in voltage-controlled correcting module is by two resistance identical R4, a preset temperature value warm
Sensing resistance transducer Ro and temperature-measuring thermistor Rk compositions.Ro determines VCXO operating ambient temperature, when VCXO working environments
When temperature is constant, i.e., thermistor Rk1 measured values are equal with preset value Ro, and now resistance bridge A, B ends output voltage difference will be
0, whole voltage-controlled module output end Uout outputs are 0.When VCXO operating ambient temperatures change, then A, B end shape of bridge
Into certain voltage difference, A3 is delivered to by voltage follower A1 and A2 transmission and carries out differential amplification, it is contemplated that the electricity after amplification
Pressure difference must effectively can gather, so the output end in differential amplification A3 adds a gain linearity regulation circuit A4 as increasing
Beneficial control module.Obtained voltage-controlled correcting module voltage difference U out after voltage-controlled voltage summation caused by microprocessor with delivering to
VCXO。
It should be appreciated that the part that this specification does not elaborate belongs to prior art.
Although describe specific embodiment of the present utility model, those of ordinary skill in the art above in association with accompanying drawing
It should be appreciated that these are merely illustrative of, various deformation or modification can be made to these embodiments, without departing from this practicality
New principle and essence.The scope of the utility model is only limited by the claims that follow.
With reference to following description and accompanying drawing, some particular implementations in the utility model embodiment are specifically disclosed,
To represent to implement some modes of the principle of embodiment of the present utility model, but it is to be understood that embodiment of the present utility model
Scope it is not limited.On the contrary, embodiment of the present utility model includes the spirit and intension for falling into attached claims
In the range of all changes, modification and equivalent.
Claims (9)
1. a kind of satellite navigation time complexity curve device, it is characterized in that, including temperature control module connection VCXO, VCXO connect DDS respectively
Frequency division module, voltage-controlled correcting module, gain control module and conventional electronics, conventional electronics connection quantized system, pressure
Correcting module connection servo circuit, DDS frequency division modules connection accumulation of phase module are controlled, accumulation of phase module connection gps signal connects
Receipts machine；Gain control module is connected with voltage-controlled correcting module, and quantized system is sequentially connected servo circuit, accumulation of phase module；DDS
Frequency division module includes isolated amplifier, walks hour counter, latch, DDS processing modules, low-pass filtering module and single-chip microcomputer；Every
Connect away hour counter, DDS processing modules respectively from amplifier, walk hour counter connection latch, latch connection single-chip microcomputer；
DDS processing modules connect single-chip microcomputer and low-pass filtering module respectively.
2. satellite navigation time complexity curve device as claimed in claim 1, it is characterized in that, DDS processing modules use AD9852.
3. satellite navigation time complexity curve device as claimed in claim 1, it is characterized in that, temperature control module includes voltage source, temperature
Acquisition module, difference amplifier A, negative feedback resistor Rw and heating coil loop；Temperature collect module connect respectively voltage source and
Difference amplifier A, difference amplifier A connect negative feedback resistor Rw, heating coil loop and voltage source respectively.
4. satellite navigation time complexity curve device as claimed in claim 3, it is characterized in that, temperature collect module includes two resistance
R, the electric bridge of resistance R1 and resistance Rk compositions；And two resistance R and resistance R1 are the resistance with identical temperature coefficient, it hinders
Value is suitable with resistance Rk；Resistance Rk is thermistor, and is affixed on the surface of temperature control modules.
5. satellite navigation time complexity curve device as claimed in claim 3, it is characterized in that, resistance Rw uses digital potentiometer.
6. satellite navigation time complexity curve device as claimed in claim 1, it is characterized in that, temperature control module is placed in VCXO.
7. satellite navigation time complexity curve device as claimed in claim 1, it is characterized in that, voltage-controlled correcting module includes electronic bridge measurement
Module, voltage follower A1, A2, difference amplifier A3；Electronic bridge measurement module includes two resistance R4, resistance R0With resistance Rk1
Form electric bridge, two resistance R4 and resistance R0It is suitable with resistance Rk1 for the resistance with identical temperature coefficient, its resistance.
8. satellite navigation time complexity curve device as claimed in claim 7, it is characterized in that, gain control module is adjusted for gain linearity
Economize on electricity road A4；It is connected with difference amplifier A3 output end.
9. satellite navigation time complexity curve device as claimed in claim 7, it is characterized in that, resistance Rk1 is thermistor, resistance R0
For thermistor (temperature) sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720813656.4U CN207218667U (en) | 2017-07-06 | 2017-07-06 | A kind of satellite navigation time complexity curve device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720813656.4U CN207218667U (en) | 2017-07-06 | 2017-07-06 | A kind of satellite navigation time complexity curve device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526288A (en) * | 2017-09-05 | 2017-12-29 | 江汉大学 | A kind of time difference correcting device and method based on GPS |
| CN110988931A (en) * | 2019-10-31 | 2020-04-10 | 北京遥测技术研究所 | Clock self-checking circuit based on AD8310 detector |
| CN112612042A (en) * | 2020-12-30 | 2021-04-06 | 江汉大学 | Satellite-borne time system |
| CN112666580A (en) * | 2020-12-16 | 2021-04-16 | 江汉大学 | Synchronization system of new energy vehicle |
-
2017
- 2017-07-06 CN CN201720813656.4U patent/CN207218667U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107526288A (en) * | 2017-09-05 | 2017-12-29 | 江汉大学 | A kind of time difference correcting device and method based on GPS |
| CN110988931A (en) * | 2019-10-31 | 2020-04-10 | 北京遥测技术研究所 | Clock self-checking circuit based on AD8310 detector |
| CN110988931B (en) * | 2019-10-31 | 2022-03-04 | 北京遥测技术研究所 | Clock self-checking circuit based on AD8310 detector |
| CN112666580A (en) * | 2020-12-16 | 2021-04-16 | 江汉大学 | Synchronization system of new energy vehicle |
| CN112612042A (en) * | 2020-12-30 | 2021-04-06 | 江汉大学 | Satellite-borne time system |
| CN112612042B (en) * | 2020-12-30 | 2024-04-19 | 江汉大学 | Satellite-borne time system |
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