Frequency-Locked Loop Also Known as Automatic Frequency Control (AFC) Loop

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Resource Overview

The Frequency-Locked Loop (FLL), also referred to as an Automatic Frequency Control (AFC) loop, employs a feedback mechanism to adjust input frequency variations, ultimately achieving precise frequency tracking. Widely used in radar and satellite navigation systems for Doppler frequency tracking, FLL implementations typically involve phase detectors, loop filters, and voltage-controlled oscillators (VCOs) in their signal processing chains.

Detailed Documentation

In fields such as radar and satellite navigation, Frequency-Locked Loops (also known as Automatic Frequency Control or AFC loops) are extensively utilized for Doppler frequency tracking. By employing feedback circuits to correct input frequency deviations, FLLs achieve accurate frequency synchronization. The implementation typically involves digital signal processing algorithms where phase error detection drives proportional-integral (PI) controllers to adjust oscillator frequencies. This technological advancement has significantly improved target detection and positioning success rates in radar and navigation systems. Furthermore, FLLs find applications in communication systems and radio technologies where they maintain signal stability through continuous frequency correction algorithms, often implemented using software-defined radio (SDR) architectures with real-time feedback control loops.

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