Frequency modulation (FM) radar is a type of radar system that uses frequency modulation to encode information about the target. In FM radar, the carrier frequency of the transmitted signal is modulated by the radar return signal, which varies depending on the range, speed, and other characteristics of the target.
Carrier frequency modulation allows FM radar to measure range and speed simultaneously, providing a distinct advantage over other radar techniques.
The principle of FM radar involves varying the frequency of the transmitted radar signal in response to echoes received from targets. As radar waves reflect objects, the frequency of the return signal changes due to the Doppler effect, caused by relative motion between the radar system and the target.
By analyzing these frequency changes, FM radar can determine the distance to the target (range) and its speed (velocity), making it useful for applications such as weather monitoring, aircraft navigation, and measurement. speed.
Frequency modulation refers to the process of varying the carrier frequency of a signal in accordance with variations in another signal, such as an information carrying signal. In the context of radar, frequency modulation involves changing the carrier frequency of the radar signal based on reflections received from targets.
This modulation allows radar systems to extract information about target characteristics, including range, speed, and sometimes even shape or orientation.
Radar typically uses various modulation techniques depending on the specific application and requirements. Besides frequency modulation (FM), other common radar modulation schemes include amplitude modulation (AM), phase modulation (PM), and pulse modulation (such as pulse-doppler radar).
Each modulation technique offers distinct advantages and is selected based on factors such as desired range, resolution, and ability to attenuate interference or clutter in radar signals