File:FMCW Doppler radar.svg
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English: Principle of operation of a FMCW Doppler radar employing a triangle waveform for frequency modulation. The diagram shows frequency versus time. The zero point of the frequency axis is far below (the modulation depth typically is of the order of a few percent). Time delay and Doppler shift are exaggerated. The blue trace is the frequency of the transmitted wave. Gray is an echo of an object at constant distance. The delay is twice the distance divided by the speed of light. The red trace is an echo of an object at the same but diminishing distance. It is shifted to higher frequencies due to the Doppler effect. For the evaluation, the two indicated frequency differences are obtained and either averaged (for the Doppler shift) or subtracted from each other and divided by the magnitude of the modulation slope to yield twice the time delay.
Deutsch: Funktionsprinzip eines FMCW-Doppler-Radars mit dreieckförmiger Frequenzmodulation. Im Diagramm sind Frequenzen gegen die Zeit aufgetragen. Der Frequenznullpunkt liegt weit unterhalb (typische Modulationstiefen liegen in der Größenordnung von wenigen Prozent). Der zeitliche Versatz und die Doppler-Verschiebung sind übertrieben dargestellt. Die blaue Linie ist die Frequenz der ausgesendeten Welle. Grau ist das Echo von einem Objekt in konstanter Entfernung. Die Verzögerung beträgt das Doppelte der Entfernung geteilt durch die Lichtgeschwindigkeit. Die rote Linie zeigt das Echo eines herannahenden Objekts in der gleichen Entfernung. Sie ist aufgrund des Doppler-Effekts zu höheren Frequenzen verschoben. Zur Auswertung werden die beiden markierten Differenzfrequenzen ermittelt und einerseits gemittelt, um die Doppler-Verschiebung zu erhalten, andererseits voneinander abgezogen und durch die Änderungsrate der Frequenz geteilt, was das Doppelte der zeitlichen Verzögerung ergibt. |
| Date | |
| Source | Own work |
| Author | Rainald62 |
| SVG development |  This diagram was created with an unknown SVG tool.  This diagram uses embedded text that can be easily translated using a text editor. |
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I, the copyright holder of this work, hereby publish it under the following license:
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:19, 17 December 2016 | | 512 × 320 (3 KB) | Rainald62 (talk | contribs) | corrected error (whitespace before number not allowed in attributes, except path data), which was ok for Chrome and rsvg but not Firefox |
| 01:44, 21 October 2011 |  | 512 × 320 (3 KB) | Rainald62 (talk | contribs) | Reverted to version as of 15:23, 17 July 2011 | |
| 01:42, 21 October 2011 |  | 512 × 320 (3 KB) | Rainald62 (talk | contribs) | Reverted to version as of 14:22, 17 July 2011 | |
| 15:23, 17 July 2011 |  | 512 × 320 (3 KB) | Rainald62 (talk | contribs) | still not resolved bugs 5792 and 23574 | |
| 14:22, 17 July 2011 |  | 512 × 320 (3 KB) | Rainald62 (talk | contribs) | test whether the previous version is now rendered correctly since [https://bugzilla.wikimedia.org/show_bug.cgi?id=18900 bug 18900] is tagged as fixed | |
| 08:10, 9 April 2011 |  | 512 × 320 (3 KB) | Rainald62 (talk | contribs) | Workaround for tspan. It's a pity that WikiMedia doesn't accomplish correct svg support. I would donate another 1000 EUR for that single task. | |
| 20:01, 14 March 2011 |  | 512 × 320 (3 KB) | Rainald62 (talk | contribs) | {{Information |Description ={{en|1=Principle of operation of a FMCW Doppler radar employing a triangle waveform for frequency modulation. The diagram shows frequency versus time. The zero point of the frequency axis is far below (the modulation depth t |
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