Zidq-piutro asked . 2021-12-21

What is the difference between "phased.Li?nearFMWave?form

1. What is the difference between "phased.LinearFMWaveform" and "phased.FMCWWaveform" in Phased Array System Toolbox except for that Triangle waveform generation is possible in P"phased.LinearFMWaveform" function.

2. My other concern is I want to sweep bandwidth of 10Mhz from start frequency of 10 MHz and End Frequency 20MHz. How can i do that in "phased.LinearFMWaveform" function.

3. When i dechirp the received signal from transmitted signal of saw-tooth waveform, i should get 2 beat frequencies (according to "New ideas in FM Radar by H. D. Griffiths"). but i get only 1 beat frequency, why?

fmcw , radar , phased array tool box

Expert Answer

Neeta Dsouza answered . 2024-12-21 16:55:02

Hi ,

LinearFMWaveform is a pulse waveform, meaning that in general the system only transmit a very short period of time during one cycle and uses the rest of cycle to receive. On the other hand, FMCWWaveform is a continuous waveform, so the system transmits and receives at the same time and the duty cycle for the waveform is always 1.

Currently you cannot specify the starting and ending frequencies in LinearFMWaveform. However, depending on the system setup, you may still be able to simulate your case. For example, if your system's center frequency is 15 MHz, then your situation is just a symmetric sweeping over a 10MHz range.

I don't have that particular paper handy so I cannot comment much on your third question without seeing some code snippet.

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