CN105223555A - A kind of wideband low noise frequency modulation signal source - Google Patents
A kind of wideband low noise frequency modulation signal source Download PDFInfo
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- CN105223555A CN105223555A CN201510608596.8A CN201510608596A CN105223555A CN 105223555 A CN105223555 A CN 105223555A CN 201510608596 A CN201510608596 A CN 201510608596A CN 105223555 A CN105223555 A CN 105223555A
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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
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Abstract
The invention discloses a kind of wideband low noise frequency modulation signal source, wherein high steady clock module possesses the output of two-way clock signal, and first via clock signal exports the reference clock end being connected directly to DDS module, and the second tunnel clock signal connects the input end of power splitter; Second tunnel clock signal is divided into two and is exported respectively by two output terminals by power splitter, and wherein a road exports DDS configuration module to; DDS configuration module exports configuration signal to DDS module, after DDS module receives configuration signal, utilizes phase measurements and look-up table produce FM signal and are exported by wave form output end; Wave form output end is connected to the first phase-locked loop circuit and the second phase-locked loop circuit respectively by low noise amplifier; The output of the first phase-locked loop circuit is as transmitting local oscillator; The output of the second phase-locked loop circuit is as reception local oscillator.This signal source can meet the demand of high linearity to wideband frequency modulation signal source, Low phase noise.
Description
Technical field
The invention belongs to radar system technical field, relate to a kind of advanced technology being specifically designed to generation high performance wideband frequency modulation signal source.
Background technology
Wideband low noise frequency modulation signal source is mainly used in the systems such as communication, radar, has broad application prospects.In field of radar, wideband low noise frequency modulation signal source can provide High Range Resolution for radar, thus strengthens the target recognition capability of radar.Along with the development of radar and the communication technology, more and more higher requirement is proposed to the many indexes such as fm linearity, phase noise of signal source.
The technical research produced based on broadband signal has become main study hotspot, current implementation both domestic and external mainly applies direct digital synthesizers (DDS) method based on digital technology, DDS, also because of its frequency conversion speed be exceedingly fast, high frequency resolution, continuous print frequency conversion phase place, lower phase noise and be convenient to the advantage such as integrated and be widely used in each Iarge-scale system, just obtains fast development in short two ten years.The continuous progress of technology and technique also promotes DDS to high frequency, multifunctional direction development.
Although the speed of digital device has had certain improvement, but still microwave and millimeter wave radar emission demand signals can not be met, particularly be subject to the restriction of digital to analog converter (DAC).The output signal of DDS is difficult to be applied directly to microwave and more high band, so must expand DDS output bandwidth on the original basis again and improve the output frequency of DDS.At present, multiple method is had can to improve DDS upper frequency limit to reach the object of spread bandwidth.Sum up and get up to have four large class: DDS in conjunction with up-conversion technology, DDS in conjunction with frequency doubling technology, DDS and PLL combinatorial compound, multichannel DDS parallel output.Many employing Direct frequency synthesizer modes in medium and long distance radar system, namely widely apply frequency multiplication, mixing, filtration module by clock source frequency inverted to required frequency at present.Adopting the signal obtained in this way just will can be used in microwave and millimeter wave wave band through many times frequency multiplication, mixing, this adds increased the complexity of circuit, and signal quality is also had a certain impact, therefore this method just can only can obtain at Mid Frequency and make an uproar mutually preferably and spuious index.And the advantage of phase-locked Frequency Synthesis Technique Controlled is to have wide frequency band, low noise and very high frequency of operation, but the longer and frequency resolution of frequency switching time lower be its maximum defect.
Summary of the invention
In view of this, the invention provides a kind of wideband low noise frequency modulation signal source, this signal source can meet the demand of high linearity to wideband frequency modulation signal source, Low phase noise.
In order to achieve the above object, technical scheme of the present invention is: comprise high steady clock module, power splitter, DDS configuration module, DDS module, phase-locked loop module and low noise amplifier.
High steady clock module possesses two-way clock signal and exports, and wherein first via clock signal exports the reference clock end being connected directly to DDS module, and the second tunnel clock signal connects the input end of power splitter.
Second tunnel clock signal is divided into two and is exported respectively by two output terminals by power splitter, and one of them output terminal of power splitter connects the reference clock end of DDS configuration module.
DDS configuration module exports configuration signal by a configuration output terminal, and this configuration output terminal is connected to the configuration input end of DDS module.
DDS module also has a wave form output end; After DDS module receives configuration signal, phase measurements and look-up table is utilized to produce FM signal by configuration signal and are exported by wave form output end.
Phase-locked loop module has the first phase-locked loop circuit and the second phase-locked loop circuit; Wherein wave form output end is connected to the first phase-locked loop circuit and the second phase-locked loop circuit respectively by low noise amplifier; The output of the first phase-locked loop circuit is as transmitting local oscillator; The output of the second phase-locked loop circuit is as reception local oscillator.
Further, the first phase-locked loop circuit is identical with the second phase-locked loop circuit, forms by phase frequency detector PFD, loop filter LF, voltage controlled oscillator VCO and frequency divider; Wherein PFD, LF are connected in turn with VCO; The output terminal of VCO, on the one hand as the output terminal of phase-locked loop circuit, is connected to one of them input end of PFD on the other hand by frequency divider; Another input end of PFD connects the output terminal of low noise amplifier simultaneously.
Further, the two-way clock signal synchronization produced by the steady clock module of height exports.
Beneficial effect:
The DDS that this signal source adopts has that frequency inverted speed is fast, frequency and the high technological merit of phase resolution.The present invention, on the basis that DDS exports, adds PLL circuit, and PLL has that frequency is high, bandwidth and the good technological merit of Frequency spectrum quality; Therefore produced signal fm linearity is high, improves the precision of target detection; Produce making an uproar mutually of signal low, improve the signal to noise ratio (S/N ratio) of signal; The Timed automata producing signal is large, realizes High Range Resolution; The detection to distance small target can be completed in Linear Frequency Modulation continuous-wave radar system, there is the effect that resolution is high, operating distance is far away.
Accompanying drawing explanation
Fig. 1 is wideband low noise frequency modulation signal source schematic diagram.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The wideband low noise frequency modulation signal source that the present embodiment proposes, as shown in Figure 1, comprises high steady clock module, power splitter, DDS configuration module, DDS module, phase-locked loop module and low noise amplifier;
High steady clock module possesses two-way clock signal and exports, and wherein first via clock signal exports the reference clock end being connected directly to DDS module, and the second tunnel clock signal connects the input end of power splitter; High steady clock module provides configurable clock generator for DDS configuration module and DDS, DDS configuration module to be controlled DDS by programming language and produces respective waveforms, the output signal of DDS after low noise amplification for PLL provides reference frequency, the output frequency of PLL is realized, the signal source needed for generation by the change of the output frequency of DDS and the frequency dividing ratio of PLL.The two-way clock signal synchronization produced by the steady clock module of height exports.
Second tunnel clock signal is divided into two and is exported respectively by two output terminals by power splitter, and one of them output terminal of power splitter connects the reference clock end of DDS configuration module;
DDS configuration module exports configuration signal by a configuration output terminal, and this configuration output terminal is connected to the configuration input end of DDS module, and configuration signal is configured DDS module and produces required FM signal; To be a kind of user according to self need DDS configuration module and the digital integrated circuit of constitutive logic function voluntarily, mainly carries out programmed configurations to DDS, make it produce required triangular signal in this signal source.
DDS module, except possessing reference clock end and configuration input end, also has a wave form output end; After DDS module receives configuration signal, phase measurements and look-up table is utilized to be met the waveform of FM signal by configuration signal generation and are exported by wave form output end; The principle of DDS utilizes phase measurements and look-up table to produce specific waveforms.Linear FM signal is obtained by direct digital synthesizers method through the phase place of secondary change, what adopt in detailed process is the phase-accumulated structure of two-stage, then the corresponding table of inquiry in ROM, is finally transformed Query Result by D/A and generates base band linear FM signal.
Wave form output end is connected to the first phase-locked loop circuit and the second phase-locked loop circuit respectively by low noise amplifier; The effect of low noise amplifier is mainly amplified signal when noise figure is very low.
The output of the first phase-locked loop circuit is as transmitting local oscillator; The output of the second phase-locked loop circuit is as reception local oscillator.
First phase-locked loop circuit is identical with the second phase-locked loop circuit, as shown in fig. 1, forms by phase frequency detector PFD, loop filter LF, voltage controlled oscillator VCO and frequency divider; Wherein PFD, LF are connected in turn with VCO; The output terminal of VCO, on the one hand as the output terminal of phase-locked loop circuit, is connected to the input end of PFD on the other hand by frequency divider; The input end of PFD connects the output terminal of low noise amplifier simultaneously.
The specific works process of phaselocked loop is that the output of voltage controlled oscillator is through gathering and frequency division, input phase frequency detector with reference signal simultaneously, phase frequency detector is by the difference on the frequency of more above-mentioned two signals, export a DC voltage, control VCO, regulate its output frequency, through this negative feedback closed loop loop, the output of VCO will be stable at a certain expectation value.
To sum up, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a wideband low noise frequency modulation signal source, is characterized in that, comprises high steady clock module, power splitter, DDS configuration module, DDS module, phase-locked loop module and low noise amplifier;
The steady clock module of described height possesses two-way clock signal and exports, and wherein first via clock signal exports the reference clock end being connected directly to described DDS module, and the second tunnel clock signal connects the input end of described power splitter;
Second tunnel clock signal is divided into two and is exported respectively by two output terminals by described power splitter, and one of them output terminal of power splitter connects the reference clock end of described DDS configuration module;
Described DDS configuration module exports configuration signal by a configuration output terminal, and this configuration output terminal is connected to the configuration input end of described DDS module;
Described DDS module also has a wave form output end; After described DDS module receives described configuration signal, phase measurements and look-up table is utilized to produce FM signal by described configuration signal and are exported by described wave form output end;
Described phase-locked loop module has the first phase-locked loop circuit and the second phase-locked loop circuit; Wherein said wave form output end is connected to the first phase-locked loop circuit and the second phase-locked loop circuit respectively by low noise amplifier; The output of described first phase-locked loop circuit is as transmitting local oscillator; The output of the second phase-locked loop circuit is as reception local oscillator.
2. a kind of wideband low noise frequency modulation signal source as claimed in claim 1, is characterized in that, described first phase-locked loop circuit is identical with the second phase-locked loop circuit, forms by phase frequency detector PFD, loop filter LF, voltage controlled oscillator VCO and frequency divider;
Wherein PFD, LF are connected in turn with VCO;
The output terminal of VCO, on the one hand as the output terminal of phase-locked loop circuit, is connected to one of them input end of PFD on the other hand by described frequency divider;
Another input end of PFD connects the output terminal of low noise amplifier simultaneously.
3. a kind of wideband low noise frequency modulation signal source as claimed in claim 1, is characterized in that, the two-way clock signal synchronization produced by the steady clock module of height exports.
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| CN107181477A (en) * | 2017-05-11 | 2017-09-19 | 清华大学深圳研究生院 | A kind of new frequency generator |
| 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 |
| CN109407057A (en) * | 2018-11-29 | 2019-03-01 | 武汉大学 | A kind of signal source of S-band wave observation radar |
| CN110855378A (en) * | 2019-12-19 | 2020-02-28 | 上海创远仪器技术股份有限公司 | Reference circuit structure for massive MIMO channel simulator |
| CN111458756A (en) * | 2019-02-28 | 2020-07-28 | 杭州芯影科技有限公司 | Millimeter wave safety detection system |
| CN112087230A (en) * | 2020-09-17 | 2020-12-15 | 中国科学院空天信息创新研究院 | Broadband linear frequency modulation signal generating device and method |
| CN112558019A (en) * | 2020-12-14 | 2021-03-26 | 北京遥感设备研究所 | Pseudo code modulation-based extra-terrestrial celestial body landing measurement radar transmitting and receiving isolation system |
| US11190193B2 (en) * | 2019-03-26 | 2021-11-30 | Lapis Semiconductor Co., Ltd. | Semiconductor device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107181477A (en) * | 2017-05-11 | 2017-09-19 | 清华大学深圳研究生院 | A kind of new frequency generator |
| 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 |
| CN109407057A (en) * | 2018-11-29 | 2019-03-01 | 武汉大学 | A kind of signal source of S-band wave observation radar |
| CN109407057B (en) * | 2018-11-29 | 2023-08-29 | 武汉大学 | Signal source of S-band wave-measuring radar |
| CN111458756A (en) * | 2019-02-28 | 2020-07-28 | 杭州芯影科技有限公司 | Millimeter wave safety detection system |
| US11190193B2 (en) * | 2019-03-26 | 2021-11-30 | Lapis Semiconductor Co., Ltd. | Semiconductor device |
| US11728815B2 (en) | 2019-03-26 | 2023-08-15 | Lapis Semiconductor Co., Ltd. | Semiconductor device |
| CN110855378A (en) * | 2019-12-19 | 2020-02-28 | 上海创远仪器技术股份有限公司 | Reference circuit structure for massive MIMO channel simulator |
| CN112087230A (en) * | 2020-09-17 | 2020-12-15 | 中国科学院空天信息创新研究院 | Broadband linear frequency modulation signal generating device and method |
| CN112558019A (en) * | 2020-12-14 | 2021-03-26 | 北京遥感设备研究所 | Pseudo code modulation-based extra-terrestrial celestial body landing measurement radar transmitting and receiving isolation system |
| CN112558019B (en) * | 2020-12-14 | 2023-08-15 | 北京遥感设备研究所 | Extraterrestrial celestial body landing measurement radar receiving and transmitting isolation system based on pseudo code modulation |
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| CN105223555B (en) | 2017-12-26 |
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Inventor after: Liu Feng Inventor after: Yu Teng Inventor after: Shen Guosong Inventor after: Wang Baoping Inventor after: Zhang Yi Inventor before: Liu Feng Inventor before: Yu Teng Inventor before: Shen Guosong Inventor before: Wang Baoping |
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