Chirp signals are often used to find target objects. In a chirp signal, the frequency varies with time. For up-chirp signals, frequency increases with time. Oppositely, for down-chirp signals, the frequency decreases with time.
Advantages of a chirp signal over a single-toned signal
- Better resolution
- Better Security
- The wide bandwidth of a chirp signal allows for capturing more detailed info about the target or object
- In a chirp signal, pulse compression enhances resolution by concentrating the signal energy into a shorter duration of time
- It is less susceptible to noise
- It improves signal to noise ratio
Up-Chirp Signal
A sinusoidal up-chirp signal is denoted as
Where A is the amplitude of this signal
f0 is the starting frequency of the chirp at t=0
α is the chirp rate or the rate at which the frequency increases with time
Down-Chirp Signal
The parameters are the same as the above equation.