DE102011012027A1 - Circuit device for frequency determination of output signal of oscillator for frequency modulated radar detector, performs frequency analysis of final signal, and determines output signal using frequency of final signal - Google Patents
Circuit device for frequency determination of output signal of oscillator for frequency modulated radar detector, performs frequency analysis of final signal, and determines output signal using frequency of final signal Download PDFInfo
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- DE102011012027A1 DE102011012027A1 DE201110012027 DE102011012027A DE102011012027A1 DE 102011012027 A1 DE102011012027 A1 DE 102011012027A1 DE 201110012027 DE201110012027 DE 201110012027 DE 102011012027 A DE102011012027 A DE 102011012027A DE 102011012027 A1 DE102011012027 A1 DE 102011012027A1
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- frequency
- signal
- output signal
- oscillator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
Abstract
Description
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zur genauen Bestimmung einer Frequenz. Sie findet beispielsweise in hochfrequenten, frequenzmodulierten Radarsensoren mit spannungsgesteuerten Oszillatoren Anwendung, bei denen eine Zuordnungstabelle („Look-up-table”) im Prozessor abgelegt wird, die jeder Ausgangsfrequenz eine Steuerspannung zuordnet. Zur Erstellung dieser Zuordnungstabelle werden beispielsweise feste Steuerspannungen vorgegeben, und die Ausgangsfrequenz wird über eine sehr genaue Frequenzmessung bestimmt. Alternativ wird die Steuerspannung so lange variiert, bis eine bestimmte Frequenz erreicht wird. Andere Verfahren sind denkbar. Die entsprechenden Frequenz/Spannungspaare werden dann in der Look-up-table” abgelegt. In allen Fällen ist eine sehr genaue Frequenzmessung notwendig.The invention relates to a device and a method for accurately determining a frequency. It is used, for example, in high-frequency, frequency-modulated radar sensors with voltage-controlled oscillators, in which a look-up table is stored in the processor, which assigns a control voltage to each output frequency. To generate this allocation table, for example, fixed control voltages are given, and the output frequency is determined by a very accurate frequency measurement. Alternatively, the control voltage is varied until a certain frequency is reached. Other methods are conceivable. The corresponding frequency / voltage pairs are then stored in the look-up table. In all cases, a very accurate frequency measurement is necessary.
Es ist Stand der Technik, ein hochfrequentes Ausgangssignal eines Oszillators (f1) über einen Frequenzteiler (
Es ist die Aufgabe der hier vorliegenden Erfindung, eine Frequenz kostengünstig und mit großer Genauigkeit zu bestimmen. Diese Aufgabe wird anhand der Merkmale der unabhängigen Ansprüche 1 und 8 gelöst. Die Unteransprüche geben bevorzugte Ausgestaltungen der Erfindung an.It is the object of the present invention to determine a frequency inexpensively and with great accuracy. This object is achieved by the features of
Das Hochfrequenzsignal (f1) wird zunächst auf eine Zwischenfrequenz durch Division durch den Divisor N geteilt, und es wird das Zwischensignal (f2) ausgegeben. Von dem Zwischensignal (f2) wird dann mit einem Frequenzsubtrahierer (
Ist die Bestimmung des niederfrequenten Ausgangssignals mit einem Fehler von x% behaftet, so ist der resultierende Fehler bei der Bestimmung der Hochfrequenz y% mit y << x.If the determination of the low-frequency output signal is subject to an error of x%, then the resulting error in the determination of the high-frequency y% is with y << x.
Bei einer beispielhaften Implementierung mit
f1 = 25000 MHz
N = 2048
f0 = 12 MHz
führt ein Fehler bei der Bestimmung der Endfrequenz von 10% lediglich zu einem Fehler in der Bestimmung der Hochfrequenz f von 0,17%. Dies ist eine Genauigkeitsverbesserung um den Faktor 59.In an example implementation with
f1 = 25000 MHz
N = 2048
f0 = 12 MHz
An error in the determination of the final frequency of 10% merely leads to an error in the determination of the high frequency f of 0.17%. This is an accuracy improvement by a factor of 59.
Eine bevorzugte Ausgestaltung der Erfindung ist in
Der Hilfsoszillator (
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110012027 DE102011012027A1 (en) | 2011-02-22 | 2011-02-22 | Circuit device for frequency determination of output signal of oscillator for frequency modulated radar detector, performs frequency analysis of final signal, and determines output signal using frequency of final signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201110012027 DE102011012027A1 (en) | 2011-02-22 | 2011-02-22 | Circuit device for frequency determination of output signal of oscillator for frequency modulated radar detector, performs frequency analysis of final signal, and determines output signal using frequency of final signal |
Publications (1)
Publication Number | Publication Date |
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DE102011012027A1 true DE102011012027A1 (en) | 2012-08-30 |
Family
ID=46635083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DE201110012027 Pending DE102011012027A1 (en) | 2011-02-22 | 2011-02-22 | Circuit device for frequency determination of output signal of oscillator for frequency modulated radar detector, performs frequency analysis of final signal, and determines output signal using frequency of final signal |
Country Status (1)
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DE (1) | DE102011012027A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB626700A (en) * | 1946-05-17 | 1949-07-20 | Standard Telephones Cables Ltd | Improved arrangement for monitoring the frequency of an alternating current |
US4504800A (en) * | 1981-07-24 | 1985-03-12 | Thomson-Csf | Wide band frequency phase locked loop frequency synthesizer |
DE19821290A1 (en) * | 1998-05-13 | 1999-11-18 | Temic Semiconductor Gmbh | Quadrature demodulator for input signal oscillating about MF |
DE69533465T2 (en) * | 1994-06-27 | 2005-09-22 | Yamaha Corp., Hamamatsu | Oscillatorschaltung |
-
2011
- 2011-02-22 DE DE201110012027 patent/DE102011012027A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB626700A (en) * | 1946-05-17 | 1949-07-20 | Standard Telephones Cables Ltd | Improved arrangement for monitoring the frequency of an alternating current |
US4504800A (en) * | 1981-07-24 | 1985-03-12 | Thomson-Csf | Wide band frequency phase locked loop frequency synthesizer |
DE69533465T2 (en) * | 1994-06-27 | 2005-09-22 | Yamaha Corp., Hamamatsu | Oscillatorschaltung |
DE19821290A1 (en) * | 1998-05-13 | 1999-11-18 | Temic Semiconductor Gmbh | Quadrature demodulator for input signal oscillating about MF |
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Owner name: CONTINENTAL AUTONOMOUS MOBILITY GERMANY GMBH, DE Free format text: FORMER OWNER: CONTI TEMIC MICROELECTRONIC GMBH, 90411 NUERNBERG, DE |