CN103809159B - Apparatus and method for signal linearizing of radar system - Google Patents
Apparatus and method for signal linearizing of radar system Download PDFInfo
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- CN103809159B CN103809159B CN201310263354.0A CN201310263354A CN103809159B CN 103809159 B CN103809159 B CN 103809159B CN 201310263354 A CN201310263354 A CN 201310263354A CN 103809159 B CN103809159 B CN 103809159B
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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
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
-
- 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
- G01S7/35—Details of non-pulse systems
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention provides an apparatus and a method for signal linearizing of a radar system, wherein the method comprises the components of: a selecting switch which forms a conversion path along with selective switching between an online calibration mode and a using mode; a PLL loop path forming part which generates the PLL loop path according to conversion control of the selecting switch to the online calibration mode; a digital-analog converter which converts a digital signal to an analog signal for generating a linear frequency modulating signal; an analog-digital converter which converts measured control voltage of the PLL loop path forming part to numbers; and an MCU which transmits the frequency control voltage to the digital-analog converter in a using mode and updates the control voltage of the analog-digital converter in the online calibration mode. According to the method for signal linearizing of the radar system, after a linear frequency modulating signal is generated and the information is acquired and received, a searching table of a required frequency voltage which is generated before using can be updated through the PLL, thereby calibrating the frequency in real time, and sustaining linearity even when the component is old or the environment changes.
Description
Technical field
The present invention relates to the system linearization device and method of radar system, specifically for the frequency of fmcw radar system
Occur, using online（On-line）Opening FREQUENCY CONTROL is implemented in calibration, keeps outstanding under the change of temperature and various environment
The linearly device and method of the radar system of frequency linearity.
Background technology
It is well known that linear frequency modulation（Chirp）Signal is linearly FMCW (Frequency Modulated
Continuous Wave) the middle key factor for determining target resolution and detecting distance, and if wanting to realize high-resolution thunder
Reach, it is necessary to wide band linear FM signal is generated within the faster time.
To improve the linear of these linear FM signals, it is proposed that excessively various methods, but in practice, according to various
Method is all difficult to form complete structure.
Fig. 1 is the PLL of traditional generation normal linear FM signal（Phase Locked Loop）Circuit structure is illustrated
Figure.As shown in figure 1, traditional PLL circuit is to receive reference clock input, when generation frequency reaches the output of N times of reference clock
Clock is used as output, including phase-frequency detector 10（PFD; Phase Frequency Detector）, electric charge（Charge）Pump
12nd, loop filter 14, voltage-controlled oscillator 16（VCO; Voltage Controlled Oscillator）, frequency divider
18。
First, phase-frequency detector 10 be to the output clock that is distributed from reference clock and voltage-controlled oscillator 16 it
Between phase and frequency difference be compared, generate rise/fall（Up/Down）Pulse, by charge pump 12 and loop filter 14
By separate type rise/fall pulses switch into the analog voltage of the controllable voltage-controlled oscillator 16, make the voltage amplitude
The output frequency for swinging device 16 eventually becomes N times of reference clock frequency.
Frequency is generated by negative feedback control by the PLL, by required frequency can be generated after the long period, but such as
Linear frequency modulation is stopped（Chirp Dwell）Time is fast, is determined linearly by the response characteristic of negative feedback loop.
Fig. 2 is the linear faults view to linear FM signal in traditional PLL circuits, and Fig. 3 is in traditional PLL lines
The frequency distortion view occurred in zig-zag in road.Fig. 2 represents loop response when fast and slow because of Trendline
Linear frequency modulation mistake, improves by loop response characteristic, can linearly be improved, but stops（Dwell）Time is fast or linearly adjusts
Frequency be shaped as zig-zag non-triangle ripple and as shown in figure 3, the frequency responded for zig-zag during the big variable quantity of some sections
The more prominent display of rate-distortion characteristic.
Fig. 4 is the structural representation of the opening FREQUENCY CONTROL circuit of traditional utilization ordinary numbers-analog converter.Such as
Shown in Fig. 4, the opening FREQUENCY CONTROL circuit of traditional utilization digital-analog convertor includes that MCU20, digital-to-analog are changed
Device 22（DAC）, voltage-controlled oscillator 24（VCO）, the voltage of voltage-controlled oscillator 24 is directly controlled be controlled rather than
By negative feedback control frequency, as long as therefore accurately grasp the frequency response characteristic of the voltage of the voltage-controlled oscillator 24, just
Linear Control can be implemented.
The opening frequency control circuit of traditional utilization digital-analog convertor is that its performance definitely depends on institute
The response characteristic of voltage-controlled oscillator 24 is stated, the characteristic of voltage-controlled oscillator 24 is the lookup of all utilization temperature
（Lookup）Table handling is important, and table operation is offline（Off-line）Carried out under state.
Because not if the time delay of negative feedback structure is without occurring the frequency distortion such as Fig. 3, but voltage control is shaken
When swinging device 24 and being changed from physical property because of the time, there is larger error with existing look-up table, be that calibration error is needed more
New look-up table, but be difficult to grasp error routine in practice, can not calibration look-up table.
Fig. 5 is traditional common Direct Digital Frequency Synthesizers（DDS）Electrical block diagram, Fig. 6 is traditional direct
The schematic diagram of digital phase-frequency relation in digital frequency synthesizer circuit.As shown in figure 5, Direct Digital Frequency Synthesizers
（DDS; Direct Digital Synthesizer）Circuit include synthesizer 30, phase register 32, phase converter 34,
Digital-to-analog converter 36, but it is different from existing analog form, and the magnitude of voltage that will be stored in the phase in phase register 32 leads to
Digital-to-analog converter 36 is crossed to export and signal occurs.Now institute is generated with numeral combination with the phase place change that the time occurs
The frequency signal for needing.
The linear of Direct Digital Frequency Synthesizers circuit by the way of signal is digitally generated definitely is better than Fig. 1 and Fig. 4
The middle analog form for illustrating respectively, but as shown in Figure 6 because in band（In-Band）The parasitic signal of generation and there is detection mistake,
Be mainly used in low-frequency band because of frequency limitation, thus upconverter need to be installed additional could be in millimere-wave band application.KR published patent
No. 2011-0076511（CW with frequency modulation signal generation apparatus and possesses the Distnace determination device of the device）
（2011.07.06）Patent discloses the technology contents of above-mentioned correlation.
The content of the invention
As described above, traditional linearly device is electric for voltage-controlled oscillator under off-line state according to temperature
The frequency output characteristics of pressure are formulated after implementing look-up table, and look-up table can not possibly be changed after being once formulated in utilization,
Even if being also required to control frequency according to the tabular value using discovery error after temperature sensor measurement temperature.
It is an object of the invention to provide a kind of lookup (Lookup) for the demand voltage to frequency for generating before
Can also be updated by PLL after table, Linear Frequency Modulation (Chirp) signal generation and collection receive information, to enter in real time
Line frequency is calibrated, and pipe component is not outmoded or environmental change, can keep the linearly makeup of linear radar system to put and side
Method, so as to improve problem present on the conventional art.
The linearly makeup that one aspect of the present invention provides a kind of radar system is put, including：Selecting switch, with online
（On-line）The selectivity of calibration mode and application mode switches to form transduction pathway；PLL loop paths forming portions, according to institute
The conversion and control for stating the online calibration mode of selecting switch forms PLL loop paths, and control voltage is determined by frequency step classification
And generate and update look-up table；Digital-to-analog converter, the conversion and control of the application mode according to the selecting switch, by number
Word signal is transformed into simulation and linear FM signal occurs；Analog-to-digital converter, by from the survey of the PLL loops forming portion
Determine control voltage and be converted into numeral；And MCU, the selecting switch is controlled according to mode state, in application mode by frequency control
Voltage processed passes to the digital-to-analog converter, to the control from the analog-to-digital converter under online calibration mode
Voltage is implemented to update.
The PLL loop paths forming portion includes：Voltage-controlled oscillator, output by the selecting switch export it is defeated
Enter the frequency signal of voltage；Coupling device, is feedback loop control, and the output signal electric power to constant basis implements distribution；Distribution
Device, output frequency of the distribution from the coupling device negative-feedback；Reference voltage controls oscillator, and generation is compared with the dividing frequency
The reference frequency of phase；, there is the negative-feedback signal dividing frequency and the reference voltage with the distributor in phase detectors
The corresponding electric charge of the difference of the frequency between the reference frequency of control oscillator；Loop filter, by the phase detectors
Generation electric charge is converted into voltage, eliminates the parasitism of high frequency band（Spurious）Signal.
The phase detectors are that frequency is locked（Lock）When to the MCU transmit lock-out state；
The MCU is the transmission according to lock-out state, digital voltage value of the storage from analogue-to-digital converters.
Another aspect of the present invention provides a kind of linearly method of radar system, and the method implementation steps include：
As the PLL loop paths according to selecting switch are formed under online calibration mode, by frequency step classification measure control voltage
Generation look-up table；MCU is converted into application mode generation linear FM signal when the generation of the look-up table is completed；The MCU exists
Online calibration mode is converted in the operation time of a cycle and determines control voltage by the amount of calibration of a cycle, according to survey
Determine control voltage and update look-up table.
The step of generation look-up table, includes：The frequency of phase detectors detection control voltage is locked（Lock）Shape
State sends the MCU to, and the control voltage is stored as digital value by the MCU.
In the step of renewal look-up table, the MCU presses maximum frequency step in the operation time in each cycle
Number updates the look-up table repeatedly.
The device have the advantages that being：Lifting linear FM signal it is linear, with lifted radar resolution and
Detecting distance, lifting resolution ratio and detecting distance and for driver provides the broader visual field, be not required to carry out calibrated off-line and technique
It is simplified and cost-effective.
Brief description of the drawings
Fig. 1 is traditional PLL circuit structural representation for generally generating linear FM signal.
Fig. 2 is the linear faults view of linear FM signal in traditional PLL circuit.
Fig. 3 is the frequency distortion view occurred in zig-zag in traditional PLL circuit.
Fig. 4 is traditional general opening frequency control circuit structural representation using digital-to-analog converter.
Fig. 5 is traditional general direct digital synthesiser（DDS）Electrical block diagram.
Fig. 6 is the schematic diagram of digital phase-frequency relation in traditional DDS circuit.
Fig. 7 is the structural representation of the linearly device of the radar system of one embodiment of the invention.
Fig. 8 be the radar system of one embodiment of the invention linearly makeup put in be intended to device linear tune
The calibration curve information schematic diagram of frequency signal
Fig. 9 is that the linearly of the radar system of one embodiment of the invention disguises the generation week for putting middle linear FM signal
Phase schematic diagram.
Figure 10 is the operational flow diagram of the linearly method of the radar system for illustrating one embodiment of the invention.
In figure：
100:Digital-to-analog converter； 110:Selecting switch；
120:Voltage-controlled oscillator； 130:Coupling device；
140:Distributor； 150:Reference voltage controls oscillator；
160:Phase detectors； 170:Loop filter；
180:Analog-to-digital converter； 190:MCU.
Specific embodiment
Below in conjunction with the accompanying drawings, the present invention with the structure is described in detail.
In the process, the line for being illustrated in accompanying drawing is thick or size of component etc. be in order on illustrating definitely with convenient meeting
It has been exaggerated that, and following terms are that function in the present invention is defined, with user, the intention of fortune user or using used
These terms therefore must be defined by example some differences based on the entire content of this specification.
Fig. 7 is that the linearly of the radar system of one embodiment of the invention disguises the structural representation put.Such as Fig. 7 institutes
Show, the linearlyization of radar system of the invention includes digital-to-analog converter（DAC）100th, selecting switch 110, voltage control
Oscillator processed（VCO）120th, coupler（Coupler）130th, distributor（Divider）140th, reference voltage control oscillator
（Reference OSC）150th, phase detectors（Phase Detector）160th, loop filter（Loop Filter）170、
Analog-to-digital converter（ADC）180 and MCU190.
The digital-analog convertor 100 is converted digital signals into for controlling the voltage-controlled oscillator 120
Analog voltage.
The selecting switch 110, according to the conversion and control of the MCU190, is selection application mode or online（On-line）
The path of calibration mode and implement conversion.
The frequency signal of the input voltage that the output of the voltage-controlled oscillator 120 is exported by the selecting switch 110.
The coupler 130 is control feedback loop control, and the output signal electric power to constant basis implements distribution.
The distributor 140 is the phase bit comparison with reference clock frequency, to the output from the negative-feedback of the coupling device 130
Frequency is allocated.
Reference voltage control oscillator 150 by with reference clock frequency in PLL negative feedback structures by negative-feedback
The reference frequency that dividing frequency compares phase is supplied to phase detectors 160.
The phase detectors 160 occur with the negative-feedback signal dividing frequency from the distributor 140 and from the ginseng
The corresponding electric charge of difference of the frequency between the reference clock frequency of voltage-controlled oscillator 150 is examined, and implements to confirm to pin
（Lock）The function of state.
The loop filter 170）The electric charge occurred from the phase detectors 160 is converted into voltage, to high frequency band
Parasitism（Spurious）Signal implements the effect removed.
The analogue-to-digital converters 180 will pinned（Lock）Controlled by the voltage-controlled oscillator 120 under state
Magnitude of voltage be converted into data signal.
Information of voltage needed for FREQUENCY CONTROL is passed to the digital-to-analog conversion by the MCU190 under application mode
Device 100, by the control from PLL and the analogue-to-digital converters 180 under online calibration mode, controls the voltage
The control voltage of oscillator 120 implements the function of updating.
As described above, linear frequency modulation frequency is typically all to be controlled according to look-up table, but the look-up table is not in off line
Generated under state, but control voltage is determined by PLL loops under current temperature status before using and original table is generated, transported
With central online（On-line）The temperature of current state can be at any time updated under state.
Fig. 8 be the radar system of one embodiment of the invention linearly makeup put in be intended to device linear tune
The calibration curve information schematic diagram of frequency signal.As shown in figure 8, in radar system linear pacer signal information（That is frequency band, time/frequency
Rate deviation（Deviation）, continue（Dwell）Time, frequency step number）Implement under state before deployment after being determined
Look up table operations.
On the other hand, when the operation of the look-up table is carried out, the selecting switch 110 is possessed connection by conversion and control
To the voltage-controlled oscillator 120, coupling device 130, distributor 140, phase detectors 160, loop filter 170 PLL
Loop paths, are first output of frequency, make PLL by negative feedback control.
And, the control conversion according to the selecting switch 100, formation is connected to the voltage-controlled oscillator 120, idol
Clutch 130, distributor 140, phase detectors 160, the PLL loop paths of loop filter 170, for being included in the PLL rings
The structure in road path is referred to as PLL loop paths forming portions.Under its state, frequency is locked（Lock）The then phase-detection
Device 160 is transmitted to the MCU190 and locked（Lock）State, the MCU190 passes through the analogue-to-digital converters 180, by this
Control voltage in voltage-controlled oscillator 120 is stored as digital value.Residual frequency for linear frequency modulation Profile is also repeatedly
Implement aforesaid operations and complete look-up table.
The look up table operations are converted to application mode after completing, and the transduction pathway of the selecting switch 110 is converted to
The storage value of look-up table is passed to the digital-analog convertor by the side of the digital-analog convertor 100, the MCU190
100, supplied with digital signal is transformed into analog voltage and controls the voltage-controlled oscillating by the digital-analog convertor 100
Device 120.
Fig. 9 is that the linearly of the radar system of one embodiment of the invention disguises the generation week for putting middle linear FM signal
Phase schematic diagram.As shown in figure 9, being needed according to linear tune with the generating period of linear FM signal in item for actual radar
The generation collection of frequency signal needs some operation times to process this after receiving data.Have within operation time and use
In the stand-by period of frequency synthesis, implement to update the online calibration of look-up table using the time.
The control voltage of all frequency steps cannot be updated in the operation time of a cycle, therefore be divided into several
Cycle is updated.That is, it is assumed that frequency step quantity has 1000, it is considered to which the Time Calculation for updating a frequency goes out one
Accessible maximum quantity in the individual cycle operation time, maximum quantity is 100, then 1-100 is updated in a cycle, under
101-200 is updated in a cycle and complete 1000 renewals totally in 10 cycles.It is described to update with unlimited in the time
Be repeated and keep optimal linear frequency modulation linear under the temperature conditionss.
Flow chart below according to Figure 10 is retouched to radar system linearly method of the invention as formed above
State.First, MCU190 is to implement conversion and control to selecting switch 110 under online calibration mode（Step S10）, opened from the selection
110 are closed to be formed to voltage-controlled oscillator 120, coupling device 130, distributor 140, phase detectors 160, loop filter 170
PLL loop paths and implement to determine the operation of control voltage respectively according to frequency step（Step S11）.
The operation of measure control voltage is implemented according to the frequency step respectively and look-up table was generated before application mode
（Step S12）, the MCU190 is by analogue-to-digital converters 180 by from the control voltage of the voltage-controlled oscillator 120
Digital value is stored as, implements to complete look-up table to the operation of all frequencies of linear frequency modulation Profile repeatedly.
Under its state, the MCU190 is converted to application mode and controls the selecting switch 110 to become to digital-to-analog
The side of parallel operation 100 forms transduction pathway（Step S13）, there is linear FM signal and be transformed into by digital-to-analog converter 100
Module and control the voltage-controlled oscillator 120（Step S14）.
Then, the MCU190 controls the selecting switch 110 according to on-line calibration pattern formation transduction pathway（Step
S15）, by the analog-to-digital converter 180, the control voltage for being converted into numeral is received by the amount of calibration of a cycle
The input of value（Step S16）And look-up table is updated according to the measurement result（Step S17）.
Above example and particular terms are merely illustrative of the technical solution of the present invention, rather than its limitations；Although reference
Previous embodiment has been described in detail to the present invention, it will be understood by those within the art that：It still can be right
Technical scheme described in foregoing embodiments is modified, or carries out equivalent to which part technical characteristic；And these
Modification is replaced, and does not make the scope of technical scheme described in the essence disengaging various embodiments of the present invention of appropriate technical solution.
Claims (6)
1. the linearly makeup of a kind of radar system is put, it is characterised in that including：
Selecting switch, as the selectivity of online calibration mode and application mode switches to form transduction pathway；
PLL loop paths forming portions, the conversion and control of the online calibration mode according to the selecting switch forms PLL loops road
Footpath, is generated by frequency step classification measure control voltage and updates look-up table；
Digital-to-analog converter, the conversion and control of the application mode according to the selecting switch, by digital signal conversion into simulation
And there is linear FM signal；
Analog-to-digital converter, numeral is converted into by the control voltage determined from the PLL loop paths forming portion；And
MCU, the selecting switch is controlled according to mode state, application mode by frequency control voltage pass to the numeral-
Analogue converter, to implementing to update from the control voltage of the analog-to-digital converter under online calibration mode.
2. the linearly makeup of radar system according to claim 1 is put, it is characterised in that
The PLL loop paths forming portion includes：
Voltage-controlled oscillator, the frequency signal of the input voltage that output is exported by the selecting switch；
Coupling device, is feedback loop control, and the output signal electric power to constant basis implements distribution；
Distributor, output frequency of the distribution from the coupling device negative-feedback；
Reference voltage controls oscillator, and the reference frequency that phase is compared with the frequency of distribution occurs；
Phase detectors, occur to control oscillator with the negative-feedback signal dividing frequency of the distributor and the reference voltage
The corresponding electric charge of the difference of the frequency between reference frequency；
Loop filter, voltage is converted into by the generation electric charge of the phase detectors, eliminates the parasitic signal of high frequency band.
3. the linearly makeup of radar system according to claim 2 is put, it is characterised in that
The phase detectors are that frequency transmits lock-out state when locked to the MCU；
The MCU stores the digital voltage value from analogue-to-digital converters according to the transmission of lock-out state.
4. a kind of linearly method of radar system, it is characterised in that the implementation steps of the method include：
As the PLL loop paths according to selecting switch are formed under online calibration mode, determined by frequency step classification and controlled
Voltage and generate look-up table；
When the generation of the look-up table is completed, MCU is converted into application mode and is become data signal with by digital-analog convertor
Change simulation into and linear FM signal occurs；
By analog-to-digital converter, the control voltage of measure is converted into numeral,
The MCU controls the selecting switch according to mode state, in the operation time of a cycle under online calibration mode
Inside be converted to online calibration mode and determine control voltage by the amount of calibration of a cycle, lookup is updated according to control voltage is determined
Table, the digital-to-analog converter is passed in application mode by frequency control voltage.
5. the linearly method of radar system according to claim 4, it is characterised in that
The step of generation look-up table, includes：The state that the frequency of phase detectors detection control voltage is locked sends institute to
MCU is stated, the control voltage is stored as digital value by the MCU.
6. the linearly method of radar system according to claim 4, it is characterised in that
In the step of renewal look-up table, the MCU is anti-by maximum frequency step number in the operation time in each cycle
The look-up table is updated again.
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| KR10-2012-0125720 | 2012-11-07 | ||
| KR1020120125720A KR102038557B1 (en) | 2012-11-07 | 2012-11-07 | Apparatus and Method for Signal Linearizing of Radar System |
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| CN103809159B true CN103809159B (en) | 2017-05-24 |
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| CN107250838B (en) * | 2015-02-19 | 2021-02-02 | 三菱电机株式会社 | FM-CW radar and method for generating FM-CW signal |
| JP6647396B2 (en) * | 2016-05-16 | 2020-02-14 | 三菱電機株式会社 | FM-CW radar |
| CN108872951B (en) * | 2017-05-12 | 2021-08-10 | 比亚迪股份有限公司 | Automobile and modulation method and modulation system of automobile FMCW radar |
| CN111505594A (en) * | 2020-04-30 | 2020-08-07 | 中国直升机设计研究所 | Portable radar signal simulator |
| DE102020129764A1 (en) * | 2020-11-11 | 2022-05-12 | Endress+Hauser SE+Co. KG | level gauge |
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|---|---|---|---|---|
| CN101031814A (en) * | 2004-09-28 | 2007-09-05 | 秦内蒂克有限公司 | Frequency modulated continuous wave (FMCW) radar having improved frequency sweep linearity |
| CN102437821A (en) * | 2011-11-30 | 2012-05-02 | 上海无线电设备研究所 | Device and method for linearization of synthetic aperture radar transmitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100712547B1 (en) * | 2006-01-24 | 2007-05-02 | 삼성전자주식회사 | Phase locked loop running at the plurality of frequency zones |
| KR100847799B1 (en) * | 2006-10-30 | 2008-07-23 | 지씨티 세미컨덕터 인코포레이티드 | Phase locked loop and temperature compensation method of the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031814A (en) * | 2004-09-28 | 2007-09-05 | 秦内蒂克有限公司 | Frequency modulated continuous wave (FMCW) radar having improved frequency sweep linearity |
| CN102437821A (en) * | 2011-11-30 | 2012-05-02 | 上海无线电设备研究所 | Device and method for linearization of synthetic aperture radar transmitter |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型非线性PLL模型及其在毫米波;任成明等;《红外与毫米波学报》;20040229;第23卷(第1期);第16-20页 * |
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| KR102038557B1 (en) | 2019-10-30 |
| CN103809159A (en) | 2014-05-21 |
| KR20140059084A (en) | 2014-05-15 |
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