JPH03235422A - Atomic oscillator - Google Patents
Atomic oscillatorInfo
- Publication number
- JPH03235422A JPH03235422A JP3060790A JP3060790A JPH03235422A JP H03235422 A JPH03235422 A JP H03235422A JP 3060790 A JP3060790 A JP 3060790A JP 3060790 A JP3060790 A JP 3060790A JP H03235422 A JPH03235422 A JP H03235422A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- oscillator
- atomic
- signal
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 abstract description 4
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910052792 caesium Inorganic materials 0.000 description 2
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 2
- 241000931526 Acer campestre Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、周波数確度を改善した原子発振器に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an atomic oscillator with improved frequency accuracy.
「従来の技術」
従来の矩形変調・ディノタル制御方式を用いたセンラム
原子発振器の構成を第２図に示す。なお、以下の説明に
おいては、セシウム原子発振器の場合について説明する
が、他の受動型原子発振器（ルビノウム原子発振器や受
動型水素メーザ）でも、原理は同様である。第２図にお
いて、電圧制御水晶発振器１の出力（周波数５ＭＨｚ）
は、周波数逓倍器２で９０ＭＨｚに逓倍される。また、
電圧制御発振器１の出力は周波数シンセサイザ３によっ
て、５ＭＨｚＸＮ／Ｍ＝１２．６３−ＭＨｚに変換され
る。ここで、ＮとＭは周波数シンセサイザ中の分周器の
分周比である（第３図参照）。周波数シンセサイザ３の
出力信号と周波数逓倍器２の出力信号をハーモニックミ
キサ４で混合することにより、９０ ：ｖｌ Ｈｚ Ｘ
１０２ ＋Ｉ ２ 、 ６３・・・ＭＨｚ＝９１９２
．６３・・・〜（Ｈｚのマイクロ波が合成される。ここ
て、分周比ＮとＭの値を外部から周期的に切り替えるこ
とにより、マイクロ波周波数をｆ、、ｆ２．ｆ、、
・・と変調することができろ。この周波数変調されｆ
ニマイクロ波に対する原子共鳴部５の出力をＡＤ変換器
６によってディノクル化し、信号処理部７において数値
的に同期検波を行ら。即ち、周波数ｆ１に対する出ツノ
をＶｆｌに対オろ出力をＶ、とし、誤差信号ＡＶ ＝
Ｖ〜′２を求める。ここで、マイクロ波の中心周波数を
ｒｌ、＝ （ｆ、−ｆ２）／２、京子共鳴部５７）共鳴
周波数をｆｂ、周波数誤差をΔｆ＝ｆ。``Prior Art'' FIG. 2 shows the configuration of a Senram atomic oscillator using the conventional rectangular modulation/dinotal control method. In the following explanation, a case of a cesium atomic oscillator will be explained, but the principle is similar for other passive atomic oscillators (rubinium atomic oscillator and passive hydrogen maser). In Figure 2, the output of voltage controlled crystal oscillator 1 (frequency 5MHz)
is multiplied by the frequency multiplier 2 to 90 MHz. Also,
The output of the voltage controlled oscillator 1 is converted by the frequency synthesizer 3 to 5MHzXN/M=12.63-MHz. Here, N and M are the frequency division ratios of the frequency divider in the frequency synthesizer (see FIG. 3). By mixing the output signal of the frequency synthesizer 3 and the output signal of the frequency multiplier 2 with the harmonic mixer 4, 90:vl Hz
102 +I 2 , 63...MHz=9192
．． 63...～(Hz microwaves are synthesized. Here, by periodically switching the values of the frequency division ratio N and M from the outside, the microwave frequency is changed to f,, f2.f,...
...and be able to modulate it. This frequency modulated f
The output of the atomic resonance section 5 with respect to the second microwave is converted into a digital signal by the AD converter 6, and the signal processing section 7 performs numerically synchronous detection. That is, let the output horn for frequency f1 be Vfl, and the output for the output be Vfl, and the error signal AV =
Find V~'2. Here, the center frequency of the microwave is rl, = (f, -f2)/2, the resonance frequency of Kyoko resonance section 57) is fb, and the frequency error is Δf=f.
「８とする時、
Δｆ＞０ → Δ〜゛〈Ｏ
Δ「−〇 → ΔＶ ＝ ０
Δ「〈０ → Δｖ〉０
となる（第４図参照）。この誤差信号を積分し、その結
果をＤＡ変換器８によってアナログ信号に変換する。そ
して、このＤＡ変換器８の出力信号によって電圧制御水
晶発振器１の発振周波数か制御される。このように、電
圧制御水晶発振器１を帰還制御することにより、周波数
は安定化される。8, Δf>0 → Δ~゛〈O Δ“−〇 → ΔV = 0 Δ”〈0 → Δv〉0 (see Figure 4). Integrate this error signal and use the result as It is converted into an analog signal by the DA converter 8.The oscillation frequency of the voltage-controlled crystal oscillator 1 is controlled by the output signal of the DA converter 8.In this way, by feedback-controlling the voltage-controlled crystal oscillator 1, , the frequency is stabilized.
また、信号処理部７はタイミング発生器９からタイミン
グ信号を得て動作するようになっている。Further, the signal processing section 7 operates upon receiving a timing signal from the timing generator 9.
１−発明が解決しようとする課題Ｊ
上記の方法によって周波数変調を行う場合、分周比切り
替えに伴う同期引き込みの過渡応答が存在する（第５図
（ａ）参照）。この変調歪のため、Δｆ ＝ ’０であ
るに乙かかわらず、■、≠ｖ２となり、周波数ソフトが
生しる原因となってい１こ。1-Problem J to be Solved by the Invention When frequency modulation is performed by the above method, there is a transient response of synchronization pull-in due to frequency division ratio switching (see FIG. 5(a)). Due to this modulation distortion, ■, ≠ v2 regardless of whether Δf = '0, which causes frequency softness to occur.
本発明は、上課題に鑑みてなされｆコもので、原子発振
器の周波数ソフトを低減させ、周波数確度を改焙するこ
とを目的とする。The present invention was made in view of the above problems, and aims to reduce the frequency softness of an atomic oscillator and improve frequency accuracy.
二課題を解決するｆコめの手段
上記課題を解決するｆ二島にこの発明は、原子共鳴装置
と、発振周波数が可変となっている周波数可変発振器と
、前記周波数可変発振器の出力周波数を前記原子共鳴装
置の共鳴周波数近傍に変換する２以上の周波数変換手段
と、前記各周波数変換手段の出力信号を順次切り換える
周波数切換手段と、前記周波数可変発振器の出力周波数
を制御する周波数制御手段とを具備し、前記周波数変換
手段の切り換えにより、前記原子共鳴装置の共鳴周波数
近傍の周波数を変調し、前記周波数制御手段は、前記変
調された周波数に対する前記原子共鳴装置の応答に基づ
いて前記周波数可変発振器の周波数を安定化させること
を特徴とする。Means for Solving the Two Problems The present invention provides an atomic resonance device, a variable frequency oscillator whose oscillation frequency is variable, and an output frequency of the variable frequency oscillator that is variable. Comprising two or more frequency conversion means for converting to a frequency near the resonance frequency of the atomic resonance apparatus, a frequency switching means for sequentially switching the output signal of each of the frequency conversion means, and a frequency control means for controlling the output frequency of the variable frequency oscillator. The switching of the frequency conversion means modulates a frequency near the resonant frequency of the atomic resonance device, and the frequency control means modulates the frequency of the variable frequency oscillator based on the response of the atomic resonance device to the modulated frequency. It is characterized by stabilizing the frequency.
作用 −
周波数切換手段によって、複数の周波数変換手段か順次
切り換えられ、周波数変調がなされる。Operation - A plurality of frequency conversion means are sequentially switched by the frequency switching means to perform frequency modulation.
こＳ）ように、切換処理によって周波数変調されると、
過渡応答状態が生じないｆこめ、変調歪による周波数ソ
フトか存在せず、周波数確度が向上する。When the frequency is modulated by the switching process as shown in this S),
Since no transient response state occurs, there is no frequency softness due to modulation distortion, and frequency accuracy is improved.
実施例
次に、この発明の実施例を図面を参照して説明する。第
１図は、この発明の一実施例であるセシウム原子発振器
の構成を示すブロック図である。Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a cesium atomic oscillator that is an embodiment of the present invention.
なお、この実施例が前述した従来例と異なる点は、周波
数シンセサイザ３に代えて２つの周波数シンセサイザ３
ａ、３ｂを設けるとともに、これろの周波数シンセサイ
ザ３ａ、３ｂの出力信号を切り換える切換スイッチｌＯ
を設けた点である。The difference between this embodiment and the conventional example described above is that two frequency synthesizers 3 are used instead of the frequency synthesizer 3.
a, 3b, and a changeover switch lO for switching the output signals of these frequency synthesizers 3a, 3b.
The point is that
第１図において、電圧制御水晶発振器ｌの出ツノ信号（
周波数５ Ｍ Ｈｚ ）は、周波数逓倍器２て９０ Ｍ
Ｈｚに逓倍される。まｆコ、電圧制御発振器Ｉの出力
信号は周波数シンセサイザ３ａ、３ｂによって５ Ｍ
Ｈｚ Ｘ ５７７８／ ２８７＝ １２．６３２２６９
３５Ｍ Ｈｚの信号と、５ Ｍ Ｈｚ Ｘ ８７０８／
３４４７＝ １２．６３１２７３５７Ｍ Ｈ２の信号
とに変換される。これら２つの周波数シンセサイザの出
力信号は、切換スイッチＩＯによって切り換えられ、こ
れにより、周波数変調されｆ三信号が得られる。この出
力信号はハーモニックミキサ４において周波数逓倍器２
の出力と混合され、ｆ ＝ ９１９２．６３２２６９
３５Ｍ Ｈｚ及びｆ ２＝９１９２．６３１２７３５７
ＭＨｚのマイクロ波が合成される。以下、前述した従来
の場合と同様にして周波数の安定化が行われる。In Fig. 1, the output horn signal (
Frequency 5 MHz) is 90 MHz with frequency multiplier 2
It is multiplied to Hz. The output signal of the voltage controlled oscillator I is converted to 5M by the frequency synthesizers 3a and 3b.
Hz x 5778/ 287= 12.632269
35 MHz signal and 5 MHz x 8708/
3447=12.63127357M H2 signal. The output signals of these two frequency synthesizers are switched by a changeover switch IO, thereby frequency modulating the f3 signal. This output signal is sent to a frequency multiplier 2 in a harmonic mixer 4.
mixed with the output of f = 9192.632269
35MHz and f2=9192.63127357
MHz microwaves are synthesized. Thereafter, frequency stabilization is performed in the same manner as in the conventional case described above.
この実施例の場合は、２つのシンセサイザは動作中宮に
同期状態にある。従って、同期引き込み時の際の過渡応
答などは存在せす、変調歪は生じないので（第５図（ｂ
）参照）、周波数シフトは低減されろ。In this embodiment, the two synthesizers are in synchronization during operation. Therefore, there is no transient response during synchronization pull-in, and no modulation distortion occurs (see Figure 5 (b).
), the frequency shift should be reduced.
「発明の効果ｊ
以上説明したようにこの発明によれば、原子発振器の周
波数シフトを低減さけ、周波数確度を改善することがで
きるので、ディジタル通信網や、各種の電波測位ンステ
ムに利用することができる。``Effects of the invention j As explained above, according to the present invention, the frequency shift of the atomic oscillator can be reduced and the frequency accuracy can be improved, so it can be used in digital communication networks and various radio wave positioning systems. can.
第１図はこの発明による原子発振器の構成図、第２図は
従来の原子発振器の構成図、第３図は周波数ノンセサイ
ザの構成図、第４図は矩形波周波数変Ａされｉコマイク
ロ波に対する原子共鳴部の対応を示す図、第５図は原子
発振器の周波数変調歪の様子を示す特性図である。
１・・・・・電圧制御水晶発振器（周波数可変発振器）
、２・ ・・周波数逓倍器、３ａ、３ｂ 周波数ン
ンセサイザ（周波数変換手段）、４・ ＤＡ変換器、５
・・・・・原子共鳴部（原子共鳴器）、６・・・・ ７
８・・・・・９・・・・・・タイミング発生器、１０・
・・・切換スイッチ（周波数切換手段）。Fig. 1 is a block diagram of an atomic oscillator according to the present invention, Fig. 2 is a block diagram of a conventional atomic oscillator, Fig. 3 is a block diagram of a frequency non-synthesizer, and Fig. 4 is a block diagram of a rectangular wave frequency-changed i-co microwave. FIG. 5 is a diagram showing the correspondence of the atomic resonance part, and a characteristic diagram showing the state of frequency modulation distortion of the atomic oscillator. 1... Voltage controlled crystal oscillator (variable frequency oscillator)
, 2... Frequency multiplier, 3a, 3b Frequency synthesizer (frequency conversion means), 4. DA converter, 5
...Atomic resonance part (atomic resonator), 6...7
8...9...timing generator, 10...
... Selector switch (frequency switching means).
Claims (1)
の共鳴周波数近傍に変換する２以上の周波数変換手段と
、 前記各周波数変換手段の出力信号を順次切り換える周波
数切換手段と、 前記周波数可変発振器の出力周波数を制御する周波数制
御手段とを具備し、 前記周波数変換手段の切り換えにより、前記原子共鳴装
置の共鳴周波数近傍の周波数を変調し、前記周波数制御
手段は、前記変調された周波数に対する前記原子共鳴装
置の応答に基づいて前記周波数可変発振器の周波数を安
定化させることを特徴とする原子発振器。[Scope of Claims] An atomic resonance device, a variable frequency oscillator whose oscillation frequency is variable, and two or more frequency conversion means for converting the output frequency of the variable frequency oscillator to a frequency near the resonance frequency of the atomic resonance device. , comprising frequency switching means for sequentially switching the output signals of each of the frequency conversion means, and frequency control means for controlling the output frequency of the variable frequency oscillator, and changing the resonance frequency of the atomic resonance device by switching the frequency conversion means. An atomic oscillator, wherein a nearby frequency is modulated, and the frequency control means stabilizes the frequency of the variable frequency oscillator based on a response of the atomic resonance device to the modulated frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3060790A JPH03235422A (en) | 1990-02-09 | 1990-02-09 | Atomic oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3060790A JPH03235422A (en) | 1990-02-09 | 1990-02-09 | Atomic oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03235422A true JPH03235422A (en) | 1991-10-21 |
Family
ID=12308563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3060790A Pending JPH03235422A (en) | 1990-02-09 | 1990-02-09 | Atomic oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03235422A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6985043B2 (en) | 2003-09-29 | 2006-01-10 | Fujitsu Limited | Atomic oscillator |
-
1990
- 1990-02-09 JP JP3060790A patent/JPH03235422A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6985043B2 (en) | 2003-09-29 | 2006-01-10 | Fujitsu Limited | Atomic oscillator |
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