CN105259535A - Method for generating frequency source of vehicle radar radio frequency front end - Google Patents
Method for generating frequency source of vehicle radar radio frequency front end Download PDFInfo
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- CN105259535A CN105259535A CN201510632296.3A CN201510632296A CN105259535A CN 105259535 A CN105259535 A CN 105259535A CN 201510632296 A CN201510632296 A CN 201510632296A CN 105259535 A CN105259535 A CN 105259535A
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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
- G01S7/282—Transmitters
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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)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention relates to a method for generating a frequency source of a vehicle radar radio frequency front end, belongs to the vehicle radar radio frequency field and solves problems that a discrete scheme and a multiple chip set scheme in the prior art have a single function; the front end of a vehicle radar has a single frequency output mode. The method is characterized in that, for a vehicle radar radio frequency front end, an inner register is set by SPI to make a work mode of a phase-locked loop chip to be frequency modulation triangular waves, a frequency modulation period and stepping are further set, a continuous triangular wave voltage is automatically generated by a CP pin of the phase-locked loop chip according to configuration of the inner register, the voltage is further provided for a VCO tuning pin of a transceiving chip, frequency modulation continuous waves are outputted by a VCO function module of the transceiving chip, emission frequency is divided by a frequency divider of the VCO function module, the divided emission frequency is sent to the phase-locked loop chip to realize feedback, the phase-locked loop chip tracks the feedback frequency to adjust voltage output of a CP pin, so the output frequency of the VCO function module is the set frequency. The method is advantaged in that output functions are rich.
Description
Technical field
The invention belongs to trailer-mounted radar RF application, relate to a kind of frequency source production method of trailer-mounted radar radio-frequency front-end.
Background technology
The 24GHz trailer-mounted radar front end being currently applied to trailer-mounted radar is generally frequency modulated continuous wave radar, and framework is one two and receives or receive more, can realize finding range, test the speed, the function such as direction finding, and its hardware plan mostly is discrete scheme or multi-chip scheme.
discrete scenario-frame and principle:
As shown in Figure 1, mainly utilize each functional module that passive structures and discrete transistor come in realizing circuit, it launches primarily of a VCO (dielectric resonator) and an amplifier tube composition, VCO tuning voltage is regulated to make it export 24GHz Continuous Wave with frequency modulation by DAC, a part gives receiving mixer, and a part gives emitting antenna after being amplified by amplifier tube; Receive and form primarily of one-level low noise amplifier and frequency mixer, Received signal strength arrives frequency mixer after LNA amplifies, and give ADC process after down coversion, wherein frequency mixer is made up of diode and passive electric circuit, and Q road, I road is realized by 90 ° of electric bridges.Except transmitting and receiving circuit, it also comprises a calibration circuit be made up of VCO and PLL, for calibrating transmission frequency, concrete principle is: make PLL that the VCO of calibration circuit is locked in expectation frequency by SPI configuration, arriving receiving mixer by calibration link, carry out down coversion together with launching this gust of signal of VCO generation, is 0 when launching VCO and calibration VCO with the frequency after down coversion during frequency, by this method, can calibrate the non-linear of VCO.Concrete block diagram as shown in Figure 1.
Discrete scheme shortcoming: design difficulty is large, requires very high to the technical merit of designer; Circuit area is comparatively large, uses limited in some miniaturization scenes; Function singleness, mostly is Continuous Wave with frequency modulation pattern; Poor-performing, the linearity compensation due to VCO is manually open loop disposable compensation, and the fm linearity after compensation still along with temperature and fluctuation service time, can lack real-Time Compensation function; Because major part adopts discrete passive structure, therefore require high to processing technology and sheet material, production batch fluctuation is large.
multi-chip scenario-frame and principle:
As shown in Figure 2, multi-chip scheme refers to and utilizes packaged chipset to carry out each functional module in realizing circuit, and its transmitting is generally made up of a VCO chip and a mid power PA chip; Receive and be made up of a low noise amplifier chip and frequency mixer.Utilize DAC to adjust the tuning voltage of VCO chip, produce Continuous Wave with frequency modulation, a part gives emitting antenna through PA amplification, and a part is through being coupled as this battle array of receiving mixer; Received signal strength is entered after frequency mixer carries out down coversion by low noise amplifier module and becomes intermediate-freuqncy signal.By high fdrequency instrument, disposable open-loop compensation must be carried out during this scheme calibration VCO linearity.The framework of chip set solutions as shown in Figure 2.
Multi-chip prescription case shortcoming: the VCO linearity is disposable open-loop compensation, exist temperature, batch etc. fluctuation problem; Number of chips is more, and circuit area is larger; Chip is all GaAs technology chip, and total cost is very high.
Summary of the invention
The present invention aims to provide a kind of frequency source production method of trailer-mounted radar radio-frequency front-end, the method output frequency enriches, and use the method, can reduce costs, improve the performance of trailer-mounted radar radio-frequency front-end, to solve existing discrete scheme and its trailer-mounted radar front end output frequency Single-issue of multi-chip prescription case function singleness.
To achieve these goals, the technical scheme adopted is: a kind of frequency source production method of trailer-mounted radar radio-frequency front-end, trailer-mounted radar radio-frequency front-end arranges internal register by SPI makes the mode of operation of phase-locked loop chip be fm waveform, and frequency modulation cycle and stepping are set, the charge pump of phase-locked loop chip exports CP pin and automatically produces continuous voltage according to internal register configuration, and this voltage is supplied to the VCO voltage tuning pin of transceiving chip, the VCO functional module of transceiving chip exports Continuous Wave with frequency modulation, simultaneously, the frequency divider of VCO functional module forms feedback by giving phase-locked loop chip after transmission frequency frequency division, phase-locked loop chip following feedback frequency is to adjust the voltage output that charge pump exports CP pin, make VCO functional module output frequency for arranging frequency, further, described in this, trailer-mounted radar radio-frequency front-end comprises: transceiving chip, phase-locked loop chip and loop filter, described transceiving chip integrated VCO functional module, the VCO functional module of transceiving chip is with frequency divider, this frequency divider exports the radio frequency input pin connecting phase-locked loop chip, and the charge pump of phase-locked loop chip exports CP pin is connected to transceiving chip VCO voltage tuning pin by loop filter.
Further, described frequency divider is 16 frequency dividers.
Further, described transceiving chip is also integrated with PA functional module, LNA functional module, MIXER functional module and DIVDER functional module.
Further, shown front end is with temperature sensor and power detection device; Shown phaselocked loop is with waveform modulated function able to programme.
Beneficial effect has: the method output frequency standard is enriched, and uses the method, can reduce costs, and improves the performance of trailer-mounted radar radio-frequency front-end.
Accompanying drawing explanation
Fig. 1 is discrete scheme block architecture diagram;
Fig. 2 multi-chip scheme block architecture diagram;
Fig. 3 is the block architecture diagram of the radar radio-frequency front-end in the frequency source production method of the trailer-mounted radar radio-frequency front-end of embodiment 1.
Wherein: 1. transceiving chip, 2. phase-locked loop chip, 3. loop filter, 4. radio frequency input pin, 5. charge pump exports CP pin, 6.VCO voltage tuning pin.
Embodiment
Embodiment 1: a kind of frequency source production method of trailer-mounted radar radio-frequency front-end, trailer-mounted radar radio-frequency front-end arranges internal register by SPI makes the mode of operation of phase-locked loop chip be the waveform such as frequency modulation triangular wave or square wave, and frequency modulation cycle and stepping are set, the charge pump of phase-locked loop chip exports CP pin produces the waveform such as continuous triangle ripple or square wave automatically voltage according to internal register configuration, and this voltage is supplied to the VCO voltage tuning pin of transceiving chip, the VCO functional module of transceiving chip exports Continuous Wave with frequency modulation, simultaneously, the frequency divider of VCO functional module forms feedback by giving phase-locked loop chip after transmission frequency frequency division, phase-locked loop chip following feedback frequency is to adjust the voltage output that charge pump exports CP pin, make VCO functional module output frequency for arranging frequency, described in this, trailer-mounted radar radio-frequency front-end comprises: transceiving chip 1, phase-locked loop chip 2 and loop filter 3, described transceiving chip 1 integrated VCO functional module, the VCO functional module of transceiving chip 1 is with frequency divider, this frequency divider exports the radio frequency input pin 4 connecting phase-locked loop chip 2, and the charge pump of phase-locked loop chip 2 exports CP pin 5 is connected to transceiving chip 1 VCO voltage tuning pin by loop filter 3.VCO functional module is the module realizing dielectric resonator and voltage controlled oscillator function.
Radar radio-frequency front-end described in the present embodiment, owing to having said mechanism, can support to test the speed, find range, direction finding, and can be used for trailer-mounted radar crashproof as forward direction, lane change is assisted, the application such as blind monitoring.
And this front end also can support that emissive power and receiving gain adjust in real time, be convenient to user and carry out Function Extension according to self-demand, during use, user only needs to carry out simple software merit rating according to actual scene demand can realize the standard radars such as high performance 24GHz Continuous Wave with frequency modulation, pulse, FSK, and VCO and PLL realizes the functions such as frequency modulation, Frequency Locking, frequency detecting automatically, user is not needed to participate in controlling, calibration etc.
Embodiment 2: be with the difference of embodiment 1: described transceiving chip 1 is also integrated with PA functional module, LNA functional module, MIXER functional module and DIVDER functional module, and shown front end is with temperature sensor and power detection device; Shown phaselocked loop, with waveform modulated function able to programme, is modulated without the need to external control.Compared with prior art, this trailer-mounted radar radio-frequency front-end also has following advantage: 1. simplicity of design, and user only needs to carry out simple register configuration just can realize complicated radar front end; 2. feature richness, support Continuous Wave with frequency modulation, pulse, the standards such as FSK, have temperature and power detection, supporting emissive power and receiving gain adjustment, being convenient to for carrying out other Function Extension; 3. better than traditional scheme performance, because the phase-locked loop chip that have employed band modulation function coordinates, the output frequency of VCO can carry out accurate self calibration in real time, and therefore frequency accuracy is higher, and performance is better; 4. cost is lower, adopts the transceiving chip of SiGe process, compares traditional chip set solutions cost reduction about 2/3rds; 5., owing to only have employed two chips, structure is simpler, and circuit area is less; 6. reliability is higher, and because main modular is all integrated in chip internal, external high frequency structure is little, therefore batch consistance and long-term reliability higher.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (5)
1. the frequency source production method of a trailer-mounted radar radio-frequency front-end, it is characterized in that, trailer-mounted radar radio-frequency front-end arranges internal register by SPI makes the mode of operation of phase-locked loop chip be fm waveform, and frequency modulation cycle and stepping are set, the charge pump of phase-locked loop chip exports CP pin and automatically produces continuous voltage according to internal register configuration, and this voltage is supplied to the VCO voltage tuning pin of transceiving chip, the VCO functional module of transceiving chip exports Continuous Wave with frequency modulation, simultaneously, the frequency divider of VCO functional module forms feedback by giving phase-locked loop chip after transmission frequency frequency division, phase-locked loop chip following feedback frequency is to adjust the voltage output that charge pump exports CP pin, make VCO functional module output frequency for arranging frequency.
2. the rate-adaptive pacemaker method of trailer-mounted radar radio-frequency front-end as claimed in claim 1, it is characterized in that: described in this, trailer-mounted radar radio-frequency front-end comprises: transceiving chip, phase-locked loop chip and loop filter, described transceiving chip integrated VCO functional module, the VCO functional module of transceiving chip is with frequency divider, this frequency divider exports the radio frequency input pin connecting phase-locked loop chip, and the charge pump of phase-locked loop chip exports CP pin is connected to transceiving chip VCO voltage tuning pin by loop filter.
3. the rate-adaptive pacemaker method of trailer-mounted radar radio-frequency front-end as claimed in claim 2, is characterized in that: described frequency divider is 16 frequency dividers.
4. the rate-adaptive pacemaker method of trailer-mounted radar radio-frequency front-end as claimed in claim 2, is characterized in that: described transceiving chip is also integrated with PA functional module, LNA functional module, MIXER functional module and DIVDER functional module.
5. the rate-adaptive pacemaker method of trailer-mounted radar radio-frequency front-end as claimed in claim 2, is characterized in that: with temperature sensor and power detection device; Shown phaselocked loop is with waveform modulated function able to programme.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510632296.3A CN105259535A (en) | 2015-09-29 | 2015-09-29 | Method for generating frequency source of vehicle radar radio frequency front end |
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| CN201510632296.3A CN105259535A (en) | 2015-09-29 | 2015-09-29 | Method for generating frequency source of vehicle radar radio frequency front end |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107329121A (en) * | 2017-07-27 | 2017-11-07 | 南京信息工程大学 | The radiating circuit measured for S-band precipitation particles scattering experiment |
| CN110471038A (en) * | 2019-08-16 | 2019-11-19 | 上海英恒电子有限公司 | A kind of Waveform generating method and device of millimetre-wave radar |
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| US20070120616A1 (en) * | 2005-11-29 | 2007-05-31 | Gonzalez Armando J | Multi-band frequency generation method and apparatus |
| CN101854171A (en) * | 2010-05-21 | 2010-10-06 | 中兴通讯股份有限公司 | Multi-frequency point simulating phase-locked loop circuit |
| CN204272083U (en) * | 2014-12-18 | 2015-04-15 | 陕西烽火实业有限公司 | A kind of ultrashort wave frequency hopping station frequency synthesizer |
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2015
- 2015-09-29 CN CN201510632296.3A patent/CN105259535A/en active Pending
Patent Citations (4)
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| US20070120616A1 (en) * | 2005-11-29 | 2007-05-31 | Gonzalez Armando J | Multi-band frequency generation method and apparatus |
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| CN101854171A (en) * | 2010-05-21 | 2010-10-06 | 中兴通讯股份有限公司 | Multi-frequency point simulating phase-locked loop circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107329121A (en) * | 2017-07-27 | 2017-11-07 | 南京信息工程大学 | The radiating circuit measured for S-band precipitation particles scattering experiment |
| CN110471038A (en) * | 2019-08-16 | 2019-11-19 | 上海英恒电子有限公司 | A kind of Waveform generating method and device of millimetre-wave radar |
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Effective date of registration: 20160127 Address after: 116023 Dalian province high tech park, Hui Park, No. 7, take off the garden of the 2 phase of the 11 floor of the Applicant after: DALIAN ROILAND TECHNOLOGY Co.,Ltd. Address before: 116023 Dalian province high tech park, Hui Park, No. 7, take off the garden of the 2 phase of the 11 floor of the Applicant before: XI'AN ZHIJI ANTENNA TECHNOLOGY Co.,Ltd. |
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Application publication date: 20160120 |
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