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Why matched filter is used?
The matched filter is the optimal linear filter for maximizing the signal-to-noise ratio (SNR) in the presence of additive stochastic noise. Matched filters are commonly used in radar, in which a known signal is sent out, and the reflected signal is examined for common elements of the out-going signal.
What is a matched filter in radar?
radar engineers call a “matched filter,” which is a filter that maximizes the signal-to-noise ratio at the receiver output. The matched filter has a precise mathematical formulation that depends on the shape of the input signal and the character of the receiver noise.
When to use a matched filter in radar?
The matched filter is the optimal linear filter for maximizing the signal-to-noise ratio (SNR) in the presence of additive stochastic noise . Matched filters are commonly used in radar, in which a known signal is sent out, and the reflected signal is examined for common elements of the out-going signal.
When is a filter called a matched filter?
If a filter produces an output in such a way that it maximizes the ratio of output peak power to mean noise power in its frequency response, then that filter is called Matched filter. This is an important criterion, which is considered while designing any Radar receiver.
How is a matched filter used in demodulation?
Matched filtering is a demodulation technique with LTI (linear time invariant) filters to maximize SNR. It was originally also known as a North filter. The following section derives the matched filter for a discrete-time system. The derivation for a continuous-time system is similar, with summations replaced with integrals.
How can echo signal be superimposed on different Doppler frequencies?
Here an echo signal can be superimposed on many different Doppler frequencies. For a helicopter recognition , are significant both the Doppler frequency of the rotor blades and the Doppler frequency of the fuselage, ie the radial velocity of the entire helicopter.