some questions about FM chirp source

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dushan1

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fm chirp

Is anybody can help me about the basic knowledge about FM chirp source ,or some examples about it. thanks!
 

FM chirp modulation is used in advanced radar, anti-jam electronic warfare, and similar system architectures.
In an FM-CW radar, a chirp signal is transmitted for certain duration. While it is transmitting, the echoes are received by the receiver and mixed with the transmit signal, and the result is low-pass filtered to produce a superposition of beat frequencies.
DDS is unquestionably the fastest switching technique for this application.
Check DDS applications from ADI or from other companies.
 

thanks! but how to estimate the quality of a FM chirp.what is the key specification?
 

how to design such a chirp
frequency rang :7600mhz~8400mhz
pulse width:100us
linearity:0.1%
step frequency:1hz
thanks
 

I want to use ad9858,and a I Q mixer.but the pulse width is only 100us ,I can't generate the singal with 1hz step. only 64khz.can anybody tell me whether the dds step frequency will influence the chirp linearity.thanks!
 

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