A coherent pulse refers to a pulse of electromagnetic energy that maintains a coherent phase relationship over time. In radar and signal processing, coherence refers to the stability of the phase or frequency of transmitted and received signals. A coherent pulse is generated by a radar transmitter in such a way that the phase of each pulse remains predictable and consistent from pulse to pulse.
This consistency enables precise measurement and analysis of returning radar echoes, particularly in applications where precise determination of target range, speed (Doppler shift), and direction is essential.
Coherent pulse radar is a radar system that uses coherent pulses to transmit and receive signals. In coherent pulse radar, transmitted pulses are generated with a stable phase relationship, ensuring that phase coherence is maintained between the transmitted and received signals.
This consistency allows the radar system to effectively measure and analyze Doppler shifts produced by moving targets, distinguish between moving targets and stationary clutter, and improve overall radar performance in terms of accuracy and sensitivity. Coherent pulse radar is widely used in military, aeronautical, meteorological and scientific applications where accurate target detection and tracking is essential.
In signal processing, a coherent signal refers to a signal whose phase relationship remains stable over time.
This stability allows the precise measurement and analysis of signal characteristics, such as frequency, amplitude and phase. Coherent signals are essential in applications such as radar, communications systems and spectroscopy, where precise timing and phase coherence are required for reliable data acquisition and processing.
Coherent signals enable efficient modulation and demodulation processes, coherent detection of information-carrying signals, and coherent integration techniques to improve signal-to-noise ratio and sensitivity.
“Fully coherent” refers to a state where all aspects of a signal or system maintain complete phase coherence. In radar and communications, fully coherent systems ensure that each component of the signal, from transmission to reception and processing, maintains a consistent and predictable phase relationship.
This consistency is crucial for accurate measurement of target properties, such as range, speed and direction, in radar applications. Fully coherent radar systems use techniques such as coherent processing, coherent integration, and Doppler processing to maximize detection capabilities and minimize errors introduced by phase variations or noise. Fully coherent systems are favored in applications where high precision and reliability are paramount, such as in military surveillance, navigation and scientific research