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KG-access
2025-07-29 21:45:44 +09:00
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Functions/03. FMCW radar design/gen_fastramp_fmcw2.m
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function [waveform_seq] = gen_fastramp_fmcw2(timing_struct, fs, f0, TxBw, ChirpIndex, NumChirps, prop_delay, phase_initial, opt)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Generating m-th Fast Ramp Linear FMCW waveform with considering different PRI
% Start : 23.12.22
% End : xx.xx.xx
% developed by Kwanggoo Yeo
%
% Description
% - Input
% - 1) timing_struct [struct], [-] : Timing information for one chirp
% - 1-1) T_dwell [scalar], [sec] : Time length for idle
% - 1-2) T_settle [scalar], [sec] : Time length for ramp start but not acquisition
% - 1-3) T_jumpback [scalar], [sec] : Time length for go back to the start frequency
% - 1-4) T_reset [scalar], [sec] : Time length for reset
% - 1-5) T_acq [scalar], [sec] : Time length for acqusition
% - 2) fs [scalar], [Hz] : Sampling rate
% - 3) f0 [scalar], [Hz] : Start frequency
% - 4) TxBw [scalar], [Hz] : Waveform Bandwidth
% - 5) ChirpIndex [scalar], [-] : m-th chirp index ( m= 1, 2, 3, ..., M )
% - 6) NumChirps [scalar], [-] : The number of chirps in one frame
% - 7) prop_delay [scalar], [sec] : Time delay by range between radar and target
% - 8) phase_ini [scalar], [deg] : Initial phase of Tx waveform in deg
%
% - Output
% - 1) waveform_seq [struct], [-] : Struct containing waveform information
% - 1-1) T_chirp [scalar], [sec] : Time length for one chirp
% - 1-2) T_frame [scalar], [sec] : Time length for one frame
% - 1-3) timeline [vec], [sec] : Time index for Fast ramp Linear FMCW sequence
% - 1-4) waveform [matrix], [-] : Fast ramp Linear FMCW sequence
%
% History
% (23.12.22) Start
%
% Referece
% -
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
T_dwell = timing_struct.T_dwell;
T_settle = timing_struct.T_settle;
T_acq = timing_struct.T_acq;
T_jumpback = timing_struct.T_jumpback;
T_reset = timing_struct.T_reset;
T_idle = timing_struct.T_idle;
waveform_seq.T_chirp = T_dwell + T_settle + T_acq + T_jumpback + T_reset + T_idle;
waveform_seq.T_frame = waveform_seq.T_chirp * NumChirps;
waveform_seq.f_slope = TxBw / T_acq;
waveform_seq.timeline = T_dwell + T_settle + (0 : 1/fs : (T_acq - 1/fs)) + ((ChirpIndex-1) * waveform_seq.T_chirp) + prop_delay;
if opt == 0
waveform_seq.waveform = cos(2 * pi * f0 * waveform_seq.timeline + 2 * pi * (waveform_seq.f_slope/2 * waveform_seq.timeline.^2) + phase_initial);
waveform_seq.waveform = waveform_seq.waveform / sqrt(norm(waveform_seq.waveform)^2 / length(waveform_seq.waveform));
elseif opt == 1
waveform_seq.waveform = exp(1i * 2 * pi * f0 * waveform_seq.timeline + 1i * 2 * pi * (waveform_seq.f_slope/2 * waveform_seq.timeline.^2) + 1i* phase_initial);
waveform_seq.waveform = waveform_seq.waveform / sqrt(norm(waveform_seq.waveform)^2 / length(waveform_seq.waveform));
else
disp('Opt error! : Real waveform(opt = 0) or Complex waveform(opt = 1)')
return;
end
end