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