CN108111167A - A kind of simulation for intermediate frequency and the method for the hybrid tracking circuit of numerical frequency - Google Patents
A kind of simulation for intermediate frequency and the method for the hybrid tracking circuit of numerical frequency Download PDFInfo
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- CN108111167A CN108111167A CN201810008685.2A CN201810008685A CN108111167A CN 108111167 A CN108111167 A CN 108111167A CN 201810008685 A CN201810008685 A CN 201810008685A CN 108111167 A CN108111167 A CN 108111167A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000004044 response Effects 0.000 claims description 10
- 230000003827 upregulation Effects 0.000 claims description 2
- 238000013459 approach Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000006399 behavior Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 230000000541 pulsatile effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of methods of the hybrid tracking circuit of simulation for intermediate frequency and numerical frequency, belong to field of radar, it is intended to can adjust actual IF frequency to medium standard frequency frequency is closer to, to realize that frequency accurately tracks.Its key points of the technical solution are that：Measure the deviation size of actual IF frequency and medium standard frequency frequency；It is bigger than normal or less than normal to judge the actual IF frequency, when bigger than normal, send adjustment pulse signal bigger than normal, when less than normal, adjustment pulse signal less than normal is sent, pulse signal bigger than normal or less than normal provides local oscillator VCO adjustment voltages after digital circuit computing is raised and lowered local frequency, adjusts actual IF signal frequency and approaches and tracked near standard frequency step by step, adjustment dynamic carries out, to realize that frequency accurately tracks.
Description
Technical field
The present invention relates to radars, more particularly to a kind of simulation for intermediate frequency and the side of the hybrid tracking circuit of numerical frequency
Method.
Background technology
Traditional analog single loop or double loop AFC system are due to the limitation by analog circuit in itself so that AFC with
Track speed is slow, tracking frequency narrow range, precision are low, it could even be possible to there is the situation of error tracking, actual IF frequency is
Tranmitting frequency subtracts the difference of local frequency, and scope certain near actual IF frequency in a standard frequent rate
It is interior, i.e., it accurate can be tracked in the range of the error criterion of frequent rate in a standard, when actual IF frequency exceeds this
When outside error criterion scope, it is possible that the situation of dislocation tracking, therefore how accurate to adjust actual IF frequency
Become urgent problem to medium standard frequency frequency is closer to.
The content of the invention
The object of the present invention is to provide a kind of simulation for intermediate frequency and numerical frequency it is hybrid tracking circuit method,
Accurate actual IF frequency can be adjusted to being closer to medium standard frequency frequency.
The present invention above-mentioned technical purpose technical scheme is that：A kind of simulation for intermediate frequency with
The method of the hybrid tracking circuit of numerical frequency, including：
Step 1：Measure the deviation size of actual IF frequency and medium standard frequency frequency；
Step 2：Judge whether the deviation size is less than error criterion, when more than error criterion, be adjusted and send tune
Whole pulse signal when less than error criterion, terminates adjustment, and exports locking signal；
Step 3：Judge that the actual IF frequency is bigger than normal or less than normal in response to adjustment signal, when less than normal, send less than normal
Pulse signal is adjusted, when less than error criterion, terminates adjustment, and exports locking signal；
Step 4：Reduce count value when its response impulse belongs to pulse signal bigger than normal, when less than normal selection increase count value, adjust
The adjustment amplitude in whole circuit is converted into adjustment floating voltage according to described value；Coarse adjustment, thin is divided in adjustment circuit according to deviation size
Adjust two circuits；
Step 5：Local frequency is adjusted according to the adjustment mode in step 4, and according to pulse signal bigger than normal up-regulation local oscillator frequency
Rate lowers local frequency according to pulse signal less than normal.
Through the above scheme, after transmitting signal is received, local frequency is subtracted using principle tranmitting frequency is mixed, is obtained
Then actual IF frequency starts the deviation size between the actual IF frequency of comparison and medium standard frequency frequency, judges this deviation
Whether size is in the range of error criterion, if it exceeds error criterion, starts to adjust, adjustment circuit is used for adjusting offer local oscillator
The size of voltage, so as to adjust the size of actual IF frequency.And there is its specific amplitude characteristic in frequency discrimination circuit, when signal enters
Behind frequency discrimination circuit, and reference frequency deviation forms range signal, can generate pulse signal, the output pulse choosing in frequency discrimination circuit
Select the circuit pulse big according to deviation.When the frequency being adjusted is closer to radar transmitter frequency, it is necessary to adjustment number it is fewer, adjust
It is whole to be determined by the count value tune of counter, quickly deviation size can be adjusted to error criterion.Count value is in each thunder
There is definite value in up to the pulse period, adjustment module is based on the value and adjusts local frequency, and local oscillator frequency is raised when frequency is higher
Rate to reduce actual IF frequency, lowers local frequency when frequency is relatively low, to improve actual IF frequency, whenever receive once
Pulse signal just adjusts once, on the one hand such adjusted stepwise accurate can adjust deviation size to error criterion,
On the other hand can more quickly adjust, and the adjusted stepwise on the basis of medium standard frequency frequency, adjustment amplitude is reduced, is avoided
Adjustment amplitude is excessive and is more than regulatory demand, and can limit the phenomenon that chasing after pendulum occurs, and in addition can so receive in a big way
Interior tranmitting frequency can increase the scope of tracking.
Further, work(sub-module：It is used to distribute the radar echo signal received；
Switching gate module：Compare for choosing with echo-signal, when selecting effective output for frequency discrimination echo-signal, when
When selecting invalid, close.
Frequency discriminator block：Its in response to adjustment signal behavior closest to the adjustment circuit of the adjustment amplitude of deviation size, and according to
Adjustment pulse is provided according to the adjustment amplitude and deviation size in the adjustment circuit；
Adjust module：It is used to adjust local frequency according to count value.
Through the above scheme, work(sub-module will receive transmitting signal and be divided into two, and be exported all the way to external circuit, another
Road is exported to switching gate module；Switching gate module selects echo-signal to be compared, and actual intermediate frequency is determined by frequency discriminator block
Deviation size between frequency and medium standard frequency frequency when simulation resonant tank receives signal when double loop, can identify reality
Border IF frequency is higher or relatively low, and when bigger than normal, pulse signal sends pulse signal less than normal by frequency discrimination circuit one, when
When less than normal, pulse signal sends pulse signal less than normal, computing module responds pulse signal bigger than normal or inclined by frequency discrimination circuit two
Small-pulse effect signal behavior adjusts circuit, and adjustment circuit is used for adjusting the size of local frequency, so as to adjust actual IF frequency
Size, and each adjustment circuit has it specifically to adjust amplitude, it is elected promote blood circulation be flushed to and reach after, start with deviation size to change
Adjustment amplitude, can output adjustment pulse；Counter counts rapid pulse rushes, and adjustment module is based on counter and adjustment circuit starts
Adjust local frequency, and local frequency raised in response to pulse signal bigger than normal, to reduce actual IF frequency, response with it is less than normal
Pulse signal lowers local frequency, to improve actual IF frequency, whenever receiving pulsatile once signal, just adjusts once, so
On the one hand adjusted stepwise accurate can adjust deviation size to error criterion, on the other hand can more quickly adjust
Section, and the adjusted stepwise on the basis of medium standard frequency frequency, reduce adjustment amplitude, avoid adjustment amplitude excessive and are needed more than adjusting
It asks, the phenomenon that chasing after pendulum can be limited and occurred.
Further, the frequency discriminator block includes double loop resonant tank,
Simulate resonant tank in double loop：It includes frequency discrimination circuit, and the frequency discrimination circuit includes frequency discrimination circuit one and adjusts frequency discrimination
Circuit two, and identify that actual IF frequency is bigger than normal or less than normal in response to adjustment signal, when bigger than normal, pulse signal passes through frequency discrimination
Circuit one, and send pulse signal bigger than normal；When less than normal, pulse signal sends pulse signal less than normal by frequency discrimination circuit two.
Through the above scheme, frequency discrimination circuit one and frequency discrimination circuit two are used to identify that actual IF frequency is relatively low or inclined
Height, when double loop simulation resonant tank receive pulse signal when, can identify actual IF frequency be it is higher or relatively low, when
When bigger than normal, pulse signal sends pulse signal less than normal, when less than normal, pulse signal passes through frequency discrimination circuit by frequency discrimination circuit one
Two, send pulse signal less than normal.
Further, the computing module includes D/A modules and counting module,
D/A modules：It is used for the adjustment floating voltage that digital signal is converted to frequency mixer VCO frequency in order to control；
Counting module：It handles frequency discrimination output digit signals and selects the adjustment circuit of the adjustment amplitude close to deviation size, adjustment
Coarse adjustment is divided in circuit according to deviation size（Circuit one）, fine tuning（Circuit two）Two circuits adjust the adjustment amplitude in circuit according to institute
It states value and is converted into corresponding control voltage；
Further, circuit is adjusted as described above includes adjustment circuit one and adjustment circuit two, the adjustment circuit one and tune
The amplitude of accommodation that whole circuit two adjusts local frequency is different.
Through the above scheme, equipped with two adjustment circuits the adjustment close to the adjustment amplitude of deviation size can be selected to return
Road, it is possible to reduce the adjustment number of substep adjustment in order to adjust rapidly, improves tracking velocity.
In conclusion the invention has the advantages that：
1st, local frequency is adjusted by substep, accurate can adjusted actual IF frequency to medium standard frequency frequency rapidly
Error criterion in；
2nd, by being equipped with adjustment circuit one and adjustment circuit two, tracking velocity can be improved.
Description of the drawings
Fig. 1 is schematic diagram of the embodiment 2 for embodiment adjustment circuit；
Fig. 2 is that embodiment 2 is used to embody the schematic diagram that resonant tank is simulated in double loop；
Fig. 3 is the schematic diagram that embodiment 2 is used to embody computing module.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing.
Embodiment one：A kind of simulation for intermediate frequency and the method for the hybrid tracking circuit of numerical frequency, first transceiver
A tranmitting frequency can be received, actual IF frequency subtracts local frequency equal to tranmitting frequency.
Step 1：The deviation size between actual IF frequency and medium standard frequency frequency is measured, that is, determines actual intermediate frequency
Difference between frequency and medium standard frequency frequency, so as to measure the departure degree of actual IF frequency and medium standard frequency frequency.
Step 2：Radar is there are one medium standard frequency frequency, and there are one bandwidth and centre frequencies for this medium standard frequency frequency
Standard when actual IF frequency is in the range of centre frequency and bandwidth criteria, accurate can track, when in step 1
In measure frequency departure after, compare whether this deviation size is less than minimum adjustment frequency, when more than when be adjusted and send
Adjust pulse；When this deviation size is less than minimum adjustment frequency, terminates to adjust and export signal, i.e., actual IF frequency is being marked
In the minimum adjustment frequency range of quasi- IF frequency, the accurate tracking of radar can be allowed, at this time without adjustment, output signal is
It can.
Step 3：After the adjustment pulse of its counting response, processing forms count value, and forms control voltage according to actual value,
When actual IF frequency is bigger than normal than medium standard frequency frequency, adjustment voltage signal bigger than normal is sent；When actual IF frequency compares standard
When IF frequency is less than normal, adjustment voltage signal less than normal is sent.
Step 4：Its adjustment voltage bigger than normal or less than normal exported send VCO to adjust circuit, and adjustment circuit is worth adjustment local oscillator according to this
The size of frequency, since tranmitting frequency can not be adjusted, adjusting local frequency will change actual IF frequency.
Step 5：After starting to adjust local frequency, when receiving adjustment voltage bigger than normal, the adjustment circuit of selection is utilized
Raise local frequency so that actual IF frequency becomes smaller, the IF frequency so that actual IF frequency is near the mark；When receiving
During adjustment voltage less than normal, local frequency is lowered using the adjustment circuit of selection so that actual IF frequency becomes larger, so that actual
IF frequency is near the mark IF frequency.
Such adjusted stepwise accurate can adjust actual IF frequency to medium standard frequency frequency, so as to fast
Adjusting actual IF frequency to the IF frequency that is near the mark for speed, improves radar surveying performance.
Embodiment two：A kind of hybrid tracking circuit of intermediate frequency, as shown in Figure 1, it includes：Work(sub-module, switching gate mould
Block, frequency discriminator block, computing module and adjustment module.
As shown in Figure 1, work(sub-module：It is connected with transceiver, and when transceiver receives tranmitting frequency, work(sub-module will
Signal is divided into two, and all the way into gating module, another way is exported to external circuit.
As shown in Figure 1, switching gate module：It is connected with work(sub-module, for selecting the comparison signal of input.
As illustrated in fig. 1 and 2, frequency discriminator block：It is connected with switching gate module, includes double loop simulation resonant tank, it is double
Loop analog resonant tank includes frequency discrimination circuit, and frequency discrimination circuit includes frequency discrimination circuit one and frequency discrimination circuit two, when switch selects
After the logical selected comparison signal of module input, double loop simulation resonant tank starts to identify that actual IF frequency is bigger than normal or inclined
It is small, if pulse signal bigger than normal by frequency discrimination circuit one, and sends pulse signal bigger than normal；When less than normal, pulse signal passes through
Frequency discrimination circuit two, and send pulse signal less than normal.
As shown in figs. 1 and 3, computing module：It is connected with frequency discriminator block, includes D/A modules and counting module；
As shown in figs. 1 and 3, counting module is handled, and when counting module receives pulse signal bigger than normal or pulse less than normal, is located
Data are managed, numerical value is controlled after formation processing.It is analog signal that D/A modules, which are used for this numerical value conversion,
As shown in Figure 1, adjustment module：It is connected with D/A modules, receives the adjustment circuit that pulse signal control bigger than normal has selected
Local frequency is raised, the adjustment circuit that pulse signal control less than normal has selected is received and lowers local frequency, finally make in practice
Frequent rate changes.
Actual IF frequency accurate can be adjusted to medium standard frequency frequency, passes through double loop by such adjusted stepwise
Selection, it is possible to reduce adjustment number so as to faster adjust actual IF frequency to the IF frequency that is near the mark, improves
Tracking velocity.
Various illustrative logical blocks, module, circuit, element and/or the component described with reference to embodiments disclosed herein is equal
It can be by general processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array
(FPGA) or other programmable logic components, discrete gate or transistor logic, discrete hardware components or it is designed to perform this paper
Any combinations of described function are practiced or carried out.General processor can be microprocessor, but another selected as, the place
It can be any conventional processor, controller, microcontroller or state machine to manage device.Processor can also be embodied as measuring component
Combination, such as the combination of DSP and microprocessor, the combination of multi-microprocessor, one or more microprocessors and DSP core
The joint of the heart or any other this configuration.
With reference to embodiments disclosed herein describe method or algorithm can be directly contained in hardware, can by processor perform
In the combination of software module or both.Software module can reside in RAM memory, flash memory, ROM memory, EPROM and deposit
In reservoir, eeprom memory, register, hard disc, removable disk, CD-ROM or technical field it is known it is any its
In the measuring machine readable media of its form.Measuring machine readable media can be coupled to the processor so that the processor can be from survey
Determine machine readable media to read information and write information to the measuring machine readable media.Alternatively, measuring machine readable media can collect
Into to processor.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, people in the art
Member can as needed make the present embodiment the modification of no creative contribution after this specification is read, but as long as at this
It is all protected in the right of invention be subject to Patent Law.
Claims (5)
1. a kind of simulation for intermediate frequency and the method for the hybrid tracking circuit of numerical frequency, including：
Step 1：Measure the deviation size of actual IF frequency and medium standard frequency frequency；
Step 2：Judge whether the deviation size is less than error criterion, when more than error criterion, be adjusted and send tune
Whole pulse signal when less than error criterion, terminates adjustment；
Step 3：Judge that the actual IF frequency is bigger than normal or less than normal in response to adjustment pulse signal, when bigger than normal, send
Adjustment pulse signal bigger than normal when less than normal, sends adjustment pulse signal less than normal, when less than error criterion, terminates adjustment；
Step 4：It responds adjustment pulse signal bigger than normal and reduces Counter Value, responding adjustment pulse signal less than normal increases Counter Value,
Adjustment circuit is selected according to the deviation size；
Step 5：Local frequency is adjusted according to the set-up procedure in step 4, and according to pulse signal bigger than normal up-regulation local oscillator frequency
Rate lowers local frequency according to pulse signal less than normal.
2. a kind of hybrid tracking circuit of intermediate frequency, including：
Work(sub-module：Echo-signal is inputted for distributing；
Switching gate module：Compare for choosing with echo-signal, when selecting effective output for frequency discrimination echo-signal, when
When selecting invalid, close；
Frequency discriminator block：Response adjustment signal judges that the actual IF frequency is bigger than normal or less than normal, when bigger than normal, sends bigger than normal
Pulse signal when less than normal, sends pulse signal less than normal；
Computing module：The pulse signal bigger than normal or pulse signal less than normal selection are responded closest to the adjustment circuit of deviation size
Adjusting parameter, adjustment amplitude and deviation size according to the adjusting parameter determine adjustment number；
Adjust module：It is used to adjust local frequency according to the adjustment number in computing module, and according to pulse signal bigger than normal
Local frequency is raised, local frequency is lowered according to pulse signal less than normal.
3. the hybrid tracking circuit of intermediate frequency according to claim 2, it is characterized in that：It is humorous that the frequency discriminator block includes double loop
Shake circuit,
Simulate resonant tank in double loop：It includes frequency discrimination circuit, and the frequency discrimination circuit includes frequency discrimination circuit one and frequency discrimination returns
Road two, and identify that actual IF frequency is bigger than normal or less than normal in response to adjustment signal, when bigger than normal, pulse signal is returned by frequency discrimination
Lu Yi, and send pulse signal bigger than normal；When less than normal, pulse signal sends pulse signal less than normal by frequency discrimination circuit two.
4. the hybrid tracking circuit of intermediate frequency according to claim 2, it is characterized in that：The computing module includes D/A moulds
Block and counting module,
D/A modules：It is used to actual count signal being converted into control signal；
Counting module：It handles the digital signal and selects the adjusting parameter in appropriate adjustment circuit, the adjusting parameter according to selection
The adjustment amplitude and deviation size provided come determine adjustment number.
5. the hybrid tracking circuit of intermediate frequency according to claim 4, it is characterized in that：The adjustment circuit, which includes, to be adjusted back
Road one and adjustment circuit two, the adjustment circuit one are different with the adjustable range for adjusting the adjusting of circuit two local frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810008685.2A CN108111167A (en) | 2018-01-04 | 2018-01-04 | A kind of simulation for intermediate frequency and the method for the hybrid tracking circuit of numerical frequency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810008685.2A CN108111167A (en) | 2018-01-04 | 2018-01-04 | A kind of simulation for intermediate frequency and the method for the hybrid tracking circuit of numerical frequency |
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| CN201810008685.2A Pending CN108111167A (en) | 2018-01-04 | 2018-01-04 | A kind of simulation for intermediate frequency and the method for the hybrid tracking circuit of numerical frequency |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726133A (en) * | 2020-05-15 | 2020-09-29 | 北京万集科技股份有限公司 | Radio frequency signal processing method and device, storage medium and electronic device |
| CN112068105A (en) * | 2020-09-07 | 2020-12-11 | 浙江光珀智能科技有限公司 | Frequency modulation continuous wave laser radar receiver signal spectrum analysis system and method |
-
2018
- 2018-01-04 CN CN201810008685.2A patent/CN108111167A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726133A (en) * | 2020-05-15 | 2020-09-29 | 北京万集科技股份有限公司 | Radio frequency signal processing method and device, storage medium and electronic device |
| CN112068105A (en) * | 2020-09-07 | 2020-12-11 | 浙江光珀智能科技有限公司 | Frequency modulation continuous wave laser radar receiver signal spectrum analysis system and method |
| CN112068105B (en) * | 2020-09-07 | 2023-09-08 | 浙江光珀智能科技有限公司 | System and method for analyzing signal spectrum of frequency modulation continuous wave laser radar receiver |
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