CN101178433B - Ultra-wideband quick frequency conversion source - Google Patents

Ultra-wideband quick frequency conversion source Download PDF

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Publication number
CN101178433B
CN101178433B CN2006101378751A CN200610137875A CN101178433B CN 101178433 B CN101178433 B CN 101178433B CN 2006101378751 A CN2006101378751 A CN 2006101378751A CN 200610137875 A CN200610137875 A CN 200610137875A CN 101178433 B CN101178433 B CN 101178433B
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frequency
unit
dds
signal
multiplication unit
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CN101178433A (en
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刘林
洪韬
田进军
彭刚
孙文波
薛明华
王振荣
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Beihang University
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Beihang University
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Abstract

The invention discloses a super broad band rapid frequency conversion, which comprises a control unit, a DDS unit, a cent unit, a double frequency unit A, a double frequency unit B and a frequency choosing unit. When in reference, the 1GHz DDS time signal is obtained through a PLL lock phase; the DDS unit is driven to produce a 0 to 400MHz signal to be divided into three ways to send to the double frequency unit A, the double frequency unit B and the frequency choosing unit. An output signal of the double frequency unit A and the double frequency unit B are also sent to the frequency choosing unit and finally the frequency choosing unit outputs a final frequency signal. The invention doubles frequency of the signal output by the DDS, and conducts choosing output, which realizes super broad band rapid frequency, with short frequency conversion response time(less than 200ns). The frequency speed reaches nanosecond grade, the output frequency range to more than 1 GHz and the frequency differentiate rate less than 0.01Hz. Under the worst condition, the scattering and harmonic wave is less than -55dBc, noise less than -95dBc/Hz at 1KHz, -105dBc/Hz at 10KHz, with simple periphery control joint and convenient utilization.

Description

A kind of ultra-wideband quick frequency conversion source
Technical field
The present invention relates to a kind of signal source that is applicable to all kinds of wideband radars such as frequency agility system radar, RCS test and imaging radar, specifically, be meant a kind of ultra-wideband quick frequency conversion source.
Background technology
In recent years, frequency agility system radar, various wideband radars such as RCS test and imaging radar more and more come into one's own, and are used widely in military and civilian field kinds such as supervision and detection, fire control and tracking, accurate guidance, measurement, high-resolution imaging, space technology, meteorology, environmental remote sensing, obstacle avoidance.The radar of various systems also comes into operation one after another, in the guided missile of various models, be applied as the Missile Terminal Guidance Anti-Jamming Technique as frequency agility system commonly used at present, RCS test radar had then more obtained application before for many years, for the stealthy design of China's weapon makes a great contribution.
Frequency-agile radar and RCS test and imaging radar, all belong to wideband radar, the bandwidth of signal and bound-time are very big for the influence of its serviceability: to frequency-agile radar, signal bandwidth and bound-time directly had influence on frequency-agile radar by intercept probability; For RCS test and imaging radar, signal bandwidth has determined its imaging resolving power, and bound-time has then determined its test duration and measuring distance.
Wideband radar, its basic structure all are that the signal with the broadband lower frequency upconverts to transmission frequency, thereby the frequency conversion source, broadband of lower frequency just seems extremely important.
The wideband frequency synthetic technology mainly contains direct frequency synthesis, frequency of phase locking is synthetic and synthetic (DDS) the three kinds of modes of Direct Digital.These three kinds of modes respectively have relative merits, and the direct frequency synthesis technique frequency inverted time is short, but complex structure, and reference frequency output is limited, and the discrete frequency number can not be too many; Phase-locked Frequency Synthesis Technique Controlled output spectrum purity height, but its frequency inverted time is longer, and frequency resolution is also limited; The DDS technology has the frequency resolution height, frequency is switched fast, low, the frequency stability advantages of higher of phase noise, but the output signal limited bandwidth.The technology that this paper adopts Direct Digital synthetic (DDS) to combine with direct frequency synthesis.
Summary of the invention
The object of the present invention is to provide a kind of ultra-wideband quick frequency conversion source.The frequency conversion source can produce that frequency inverted response time<200ns, bandwidth 1GHz are above, frequency resolution less than 0.01Hz low spuious, hang down the frequency agility signal of making an uproar mutually, can be used as the basic functional units of all kinds of wideband radars.
Frequency conversion of the present invention source comprises control module, DDS unit, merit subdivision, frequency multiplication unit A, frequency multiplication unit B, frequency selected cell.
Frequency conversion of the present invention source principle of work: the technology that adopts Direct Digital synthetic (DDS) to combine with direct frequency synthesis, reference clock is through the phase-locked DDS clock signal that obtains 1GHz of PLL, drive the DDS unit and produce 0~400MHz signal, be divided into 3 the tunnel through the merit subdivision, send into frequency multiplication unit A, frequency multiplication unit B and frequency selected cell respectively, the output signal of frequency multiplication unit A and frequency multiplication unit B is also sent into the frequency selected cell, at last by the final frequency agility signal of frequency selected cell output.
Wherein, in described control module, realize accurate control, make the closely collaborative work of DDS unit and frequency selected cell, thereby reached the extremely short frequency inverted response time DDS unit and frequency selected cell by the high speed logic device; In described frequency multiplication unit A and frequency multiplication unit B, obtain desirable low spuious frequency-doubled signal by selecting suitable filter bandwidht.
Advantage of the present invention: (1) function admirable, frequency inverted response time<200ns, reference frequency output>1GHz, frequency resolution<0.01Hz, under the worst case, spuious reaching is lower than-55dBc together with ripple, Make an uproar mutually and be lower than-95dBc/Hz@1KHz, -105dBc/Hz@10KHz(2) control interface is simple, and is easy to use; (3) working stability is reliable.
Description of drawings
Fig. 1 is the theory diagram in frequency conversion of the present invention source.
Fig. 2 is the control module theory diagram in frequency conversion of the present invention source.
Fig. 3 is the DDS unit theory diagram in frequency conversion of the present invention source.
Fig. 4 is the frequency multiplication unit A theory diagram in frequency conversion of the present invention source.
Fig. 5 is the frequency multiplication unit B theory diagram in frequency conversion of the present invention source.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is a kind of ultra-wideband quick frequency conversion source, comprises control module 1, DDS unit 2, merit subdivision 3, frequency multiplication unit A4, frequency multiplication unit B 5, frequency selected cell 6.
Described control module 1 is by comprising on-site programmable gate array FPGA 10, single-chip microprocessor MCU 11, LCD MODULE 12, keyboard 13; Described DDS unit 2 comprises constant-temperature crystal oscillator 20, clock distributor 21, phase-locked loop pll 22, Direct Digital Frequency Synthesizers DDS23; Described frequency multiplication unit A 4 comprises wave filter A410, amplifier A420, wave filter B411, frequency multiplier A430, wave filter C412, amplifier B421, amplifier C422, filter D 413, wave filter E414, frequency multiplier B431, wave filter F415, amplifier E423, wave filter G416; Described frequency multiplication unit B 5 comprises filters H 510, amplifier F520, wave filter I511, frequency multiplier C530, wave filter J512, amplifier G521, amplifier H522, wave filter K513, wave filter L514, frequency multiplier D531, wave filter M515, amplifier I523, wave filter N516.
Base when described control module 1 is provided with the reference in frequency conversion source by keyboard operation or serial ports control 10 when outer (Nei Shiji/base), mode of operation (some frequency/frequency step/control code is controlled), frequency sweep start-stop frequency and step frequency etc., and the duty that foundation sets removes to control DDS unit 2 and frequency selected cell 6 by parameter that presets or current control code 11, make it collaborative work, produce required frequency agility signal 9.
Described DDS unit 2, base input when base 7 was as the reference of phaselocked loop 22 when clock distributor 21 was selected the output of constant-temperature crystal oscillator 20 or External Reference according to the control of control module 1, phaselocked loop 22 phase locking frequency multiplyings are gone out the clock of 1GHz signal as Direct Digital Frequency Synthesizers 23, and Direct Digital Frequency Synthesizers 23 is exported the DDS output signal 12 of 0-400MHz under the control of control module 1.
Described frequency multiplication unit A 4 and frequency multiplication unit B 5 will distribute that the signal of the 0-400MHz signal leaching part bandwidth of gained amplifies by merit subdivision 3 respectively, filtering, frequency multiplication, obtain two and the quadruple signal respectively.
Described frequency selected cell 6 is under the control of control module 1, adopt PIN pipe switch, two frequency-doubled signals 15, quadruple signal 16 that DDS output signal 17 after dividing through merit, two frequency-doubled signals 13, quadruple signal 14 and the frequency multiplication unit B of frequency multiplication unit A output are exported are selected output, obtain required frequency agility signal 9.

Claims (4)

1. ultra-wideband quick frequency conversion source is characterized in that:
Described frequency conversion source comprises control module (1), DDS unit (2), merit subdivision (3), frequency multiplication unit A (4), frequency multiplication unit B (5), frequency selected cell (6); Wherein
The phase-locked DDS clock signal that obtains 1GHz of the PLL of reference clock (7 or 8) in DDS unit (2), and the Direct Digital Frequency Synthesizers (23) that drives in the DDS unit (2) produces 0~400MHz signal (12), be divided into 3 the tunnel through merit subdivision (3), send into frequency multiplication unit A (4), frequency multiplication unit B (5) and frequency selected cell (6) respectively, the output signal of frequency multiplication unit A (4) and frequency multiplication unit B (5) is also sent into frequency selected cell (6), at last by the final frequency agility signal (9) of frequency selected cell (6) output.
2. a kind of ultra-wideband quick frequency conversion source according to claim 1, it is characterized in that: in described control module (1), by the accurate control of high speed logic device realization to DDS unit (2) and frequency selected cell (6), make the closely collaborative work of DDS unit (2) and frequency selected cell (6), thereby reached the extremely short frequency inverted response time.
3. a kind of ultra-wideband quick frequency conversion source according to claim 1 is characterized in that: in described frequency multiplication unit A (4) and frequency multiplication unit B (5), obtain desirable low spuious frequency-doubled signal by selecting suitable filter bandwidht.
4. a kind of ultra-wideband quick frequency conversion source according to claim 1 is characterized in that: in described frequency selected cell (6), use the PIN switch to carry out signal and select.
CN2006101378751A 2006-11-08 2006-11-08 Ultra-wideband quick frequency conversion source Expired - Fee Related CN101178433B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4933635B2 (en) * 2010-02-19 2012-05-16 日本電波工業株式会社 PLL circuit
CN102780490B (en) * 2012-08-14 2014-12-10 武汉滨湖电子有限责任公司 DDS (direct digital synthesis) type ultra-wide band frequency-modulated signal generating circuit and method
CN103675767B (en) * 2013-09-02 2016-06-29 中国科学院电子学研究所 A kind of ultra wide band low power radiofrequency signal generator and method thereof
CN103532589B (en) * 2013-10-11 2016-04-13 四川九洲电器集团有限责任公司 Frequency agility signal generation system and method
CN104579335A (en) * 2014-09-26 2015-04-29 中国人民解放军总参谋部第六十三研究所 Frequency design method for frequency synthesizer
CN105137401A (en) * 2015-08-24 2015-12-09 哈尔滨工程大学 Fast small-stepping agile frequency conversion radar signal generation device
CN115166382B (en) * 2022-07-06 2023-06-27 成都中创锐科信息技术有限公司 Multi-radiation-source coherent signal simulation device and method

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CN1490634A (en) * 2002-09-23 2004-04-21 Frequency agility PRT deconvolution method, system and application thereof
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CN1633026A (en) * 2004-12-23 2005-06-29 太原理工大学 High-speed linear frequency modulation signal source
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