Generating FMCW Tx chirp

Dear all,

i need a help, how can i generate the transmitted FMCW chirp with the following parameters:

fc= 77e9;

c = 3e8;

lambda= FMCW.c/FMCW.fc;

res= 1; % range resolution for 1 meter

T_cycle= 40e-3; % radar system cycle [s]

BW = range2bw(SETTINGS.FMCW.res,SETTINGS.FMCW.c); % sweep bandwidth

max_range= 200;

T_sweep= 12.8e-6; % sweep time

sweep_slope=BW / T_sweep; % slope [Hz/s]

T_id = 31.2e-6; % idle time per sweep/ramp [s] (sig.T_sw/10)

T_total = T_sweep + T_id; % total sweep time [s]

N_sweep = 256; % number of sweeps/ramps (how many the sequence we send out, defines also the velocity res)

N_seq = 1; % number of sequences (of N_sw ramps each)

N_sweep_total = sig.N_sw*sig.N_seq; % total number of sweeps

N_samp_per_ramp = 1/2*1024; % number of fast-time samples (ADC samples per ramp) (how many samples per ramp)

max_speed= 230*1000/3600; % max speed of 230Km/h

fr_max=range2beat(SETTINGS.FMCW.max_range,SETTINGS.FMCW.sweep_slope,SETTINGS.FMCW.c);

fd_max= speed2dop(2*SETTINGS.FMCW.max_speed); % doppler shift

fb_max= SETTINGS.FMCW.fr_max * SETTINGS.FMCW.fd_max; % max beat freq

Fs= max(2*fb_max,SETTINGS.FMCW.BW); % sample freq

Ts= 1/SETTINGS.FMCW.Fs; % sample rate

Thanks in advance!

Answer 1

[Alan Moses]

You can refer the Automotive Adaptive Cruise Control Using FMCW Technology example to model the FMCW Transmitter chirp. Hope this helps!