68 lines
2.8 KiB
Matlab
68 lines
2.8 KiB
Matlab
%% 生成混频信号
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function rawData = generateSignal(Parameter)
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c = Parameter.c; %光速
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stratFreq = Parameter.stratFreq; %起始频率
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Tr = Parameter.Tr; %扫频时间
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samples = Parameter.Samples; %采样点
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fs = Parameter.Fs; %采样率
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rangeBin = Parameter.rangeBin; %rangeBin
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chirps = Parameter.Chirps; %chirp数
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dopplerBin = Parameter.dopplerBin; %dopplerBin
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slope = Parameter.Slope; %chirp斜率
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bandwidth = Parameter.Bandwidth; %发射信号带宽
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centerFreq = Parameter.centerFreq; %中心频率
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lambda = Parameter.lambda;
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txAntenna = Parameter.txAntenna; %发射天线
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txNum = length(txAntenna); %发射天线数
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rxAntenna = Parameter.rxAntenna; %接收天线
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rxNum = length(rxAntenna); %接收天线数
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dz = Parameter.dz; %俯仰间距
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dx = Parameter.dx; %水平间距
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target = Parameter.target; %目标
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targetNum = size(target,1); %目标数
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rawData = zeros(txNum*rxNum,rangeBin,dopplerBin);
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t = 0:1/fs:Tr-(1/fs); %chirp采样的时间序列
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for chirpId = 1:chirps
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for txId = 1:txNum
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St = exp((1i*2*pi)*(centerFreq*(t+(chirpId-1)*Tr)+slope/2*t.^2)); %发射信号
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for rxId = 1:rxNum
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Sif = zeros(1,rangeBin);
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for targetId = 1:targetNum
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%%连续帧 目标设置，如果不需要连续帧，令Parameter.frame=0，即可。
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if targetId==1
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targetRange = target(targetId,1)-Parameter.frame;
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targetSpeed = target(targetId,2);
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targetAngle = target(targetId,3);
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elseif targetId==2
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targetRange = target(targetId,1)+0.5*Parameter.frame;
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targetSpeed = target(targetId,2);
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targetAngle = target(targetId,3);
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elseif targetId==3
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targetRange = target(targetId,1)+Parameter.frame;
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targetSpeed = target(targetId,2);
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targetAngle = target(targetId,3);
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end
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tau = 2 * (targetRange + targetSpeed * (txId - 1) * Tr) / c;
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fd = 2 * targetSpeed / lambda;
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wx = ((txId-1) * rxNum + rxId) / lambda * dx * sind(targetAngle);
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Sr = 10*exp((1i*2*pi)*((centerFreq-fd)*(t-tau+(chirpId-1) * Tr)+slope/2*(t-tau).^2 -wx)); %回波信号
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Sif = Sif + St .* conj(Sr);
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%叠加20dB高斯白噪声
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Sif = awgn(Sif,20);
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end
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rawData((txId-1) * rxNum + rxId,:,chirpId) = Sif;
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end
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end
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end
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end
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