Velocity Resolution vs. Chirps per Frame

Velocity resolution is inversely proportional to the coherent observation time (frame time),

hence increasing frame rate degrades velocity resolution.

 

 

Velocity	Angle
	λ  wavelength of RF center frequency T_f  frame time

 

 

 

 

 

Increasing Vres

Increasing the number of chirps per frame improves velocity resolution without degrading the maximum unambiguous velocity,

as long as the chirp repetition interval (PRI/CRI) remains unchanged. However, it increases frame time and reduces update rate

 

 

 

 

 

 

 

 

Example

 

Parmeter	Symbol	Value	Unit
Chirp Duration	T_c	1,000	1,000
Chirp Start Freq.	f_chirp_start	24.05	GHz
Chirp Cutoff Freq.	f_chirp_stop	24.25	GHz

 

 

32 Chirp/Frame

 

 

64 Chirp/Frame