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Chirp Timing and Frequency

Chirp timing parameters define the temporal structure of the waveform, including start, up, down, and stop periods

 

 

 

 

1. Chirp Timing

A chirp consists of four timing parameters.

Its total duration, defined as the chirp cycle (or chirp period), represents the complete time of one chirp.

 

 

Chirp Cycle/Period

Remark  

With a fixed baseband bandwidth,

the slope determines the maximum measurable range inversely.

ex) T_chirp=1000 us, T_START=20 us, T_UP=420 us, T_DOWN=150 us, T_STOP=410 us

 

 

 

 

 

2. Chirp Frequency

 

 

 

 

Chirp(RF) Bandwidth

Remark  

Chirp bandwidth is directly related to the range resolution of a radar system.

ex) B_RF = 24.25 – 24.05 = 0.20 GHz = 200  MHz

 

 

 

 

 

3. Chirp Slope

 

 

 

 

Chirp Slope

Remark  

With a fixed baseband bandwidth,

the slope determines the maximum measurable range inversely.

ex) S = 0.476 MHz/μs   , B_RF=200MHz, T_UP =420 us

 

 

 

 

 

 

 

 

 

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