/// <summary>
/// 获取线性调频信号中的 IQ数据
/// </summary>
/// <param name="isIdata"></param>
/// <returns></returns>
private double[] LFMSingnal(bool isIdata = true)
{
double T = 10 * 1e-6; // 0.00001;
double B = 1 * 1e6; // 1000000;
double k = B / T; // 调频斜率
double t = 5 * 1e-6; // 0.000005;% 空信号时长5us
double fs = 4 * 1e9; // 4000000000;
// 生成200Msa线性调频信号 5us空 + 10us线性调频
double fs1 = 200 * 1e6;
int n1 = (int)Math.Round(T * fs1); //采样点个数
//double[] t1 = new double[n1];
double tspan = T / n1;
MathNet.Numerics.Complex32[] y1 = new MathNet.Numerics.Complex32[n1];
for (int i = 0; i < n1; i++)
{
MathNet.Numerics.Complex32 tempComple = new MathNet.Numerics.Complex32(0, (float)(Math.PI * k * (i * tspan) * (i * tspan)));
// double aa= tempComple* k;
y1[i] = MathNet.Numerics.Complex32.Exp(tempComple);
}
double[] idata = y1.Select(a => (double)a.Real).ToArray();
double[] qdata = y1.Select(a => (double)a.Imaginary).ToArray();
// freqDomi("LFM_freq.csv", idata, qdata, 200 * 1e6);
double[] result = new double[1000 + n1];
if (isIdata)
{
Array.Copy(idata, 0, result, 1000, n1);
//result = idata;
}
else
{
Array.Copy(qdata, 0, result, 1000, n1);
//result = qdata;
}
return(result);
//y1 = exp(1j * pi * k * t1.^ 2);% LFM信号
// MathNet.Numerics.Complex32.Exp()
}
/**
* 广义互相关频域补零时延估计算法
* @param zeroWaveData
* 零应力波形
* @param testWaveData
* 测试应力波形
* @param sampleTime
* 采样间隔
* @param interTimes
* 插值倍数
* @return TDETuple
* [时延，互相关系数数组]
* 时延，单位:s 拉应力时返回正数，压应力返回负数
*/
public Tuple <double, double[]> GCC_FZPTDE(double[] zeroWaveData, double[] testWaveData, double sampleTime, int interTimes)
{
Tuple <double, double[]> TDETuple;
double timeDelay = 9999.09;
double[] abs_xCorr;
if (zeroWaveData.Length != testWaveData.Length)
{
abs_xCorr = new double[128];
TDETuple = new Tuple <double, double[]>(timeDelay, abs_xCorr);
return(TDETuple);
}
int realLength = zeroWaveData.Length;
//将数据长度补零为2的幂
int fftDataLen = 1 << ((int)(Math.Log(realLength - 1) / Math.Log(2)) + 1);
double[] pad_zeroWaveData = new double[fftDataLen]; //zeropadding
double[] pad_testWaveData = new double[fftDataLen]; //zeropadding
Array.Copy(zeroWaveData, pad_zeroWaveData, realLength);
Array.Copy(testWaveData, pad_testWaveData, realLength);
//傅里叶变换
MathNet.Numerics.Complex32[] zeroWaveFFTData = new MathNet.Numerics.Complex32[fftDataLen];
MathNet.Numerics.Complex32[] testWaveFFTData = new MathNet.Numerics.Complex32[fftDataLen];
for (int i = 0; i < fftDataLen; i++) //转为复数
{
zeroWaveFFTData[i] = new MathNet.Numerics.Complex32((float)pad_zeroWaveData[i], 0);
testWaveFFTData[i] = new MathNet.Numerics.Complex32((float)pad_testWaveData[i], 0);
}
Fourier.Forward(zeroWaveFFTData); //傅里叶变换
Fourier.Forward(testWaveFFTData); //傅里叶变换
//计算zeroWaveFFTData*(testWaveFFTData的共轭复数)
MathNet.Numerics.Complex32[] xCorrFFT = new MathNet.Numerics.Complex32[fftDataLen * interTimes];
MathNet.Numerics.Complex32 testWaveFFTDataConj;
for (int i = 0; i < fftDataLen / 2; i++) //正域赋值
{
testWaveFFTDataConj = MathNet.Numerics.Complex32.Conjugate(testWaveFFTData[i]);
xCorrFFT[i] = MathNet.Numerics.Complex32.Multiply(zeroWaveFFTData[i], testWaveFFTDataConj);
}
int n = 0;
for (int i = fftDataLen / 2; i < fftDataLen; i++) //负域赋值
{
n = i + (fftDataLen * interTimes - fftDataLen);
xCorrFFT[n] = MathNet.Numerics.Complex32.Multiply(zeroWaveFFTData[i], MathNet.Numerics.Complex32.Conjugate(testWaveFFTData[i]));
}
//逆傅里叶变换
Fourier.Inverse(xCorrFFT);
fftDataLen = fftDataLen * interTimes;
abs_xCorr = new double[fftDataLen];
double scaling_factor = NormL2(zeroWaveData) * NormL2(testWaveData); //归一化缩放因子为2范数积
for (int i = 0; i < fftDataLen; i++)
{
abs_xCorr[i] = MathNet.Numerics.Complex32.Abs(xCorrFFT[i]);
abs_xCorr[i] = abs_xCorr[i] * (Math.Sqrt((float)fftDataLen)) / scaling_factor; //归一化
}
//查找abs_xCorr最大值对应位置
int maxPos = MaxIndex(abs_xCorr);
//计算时延 单位：s
timeDelay = (fftDataLen - maxPos);
if (timeDelay > (double)fftDataLen / 2)
{
timeDelay = -1 * maxPos;
}
timeDelay = timeDelay * sampleTime / interTimes;
TDETuple = new Tuple <double, double[]>(timeDelay, abs_xCorr);
return(TDETuple);
}
protected void UpdateSCI()
{
int nFFT = 32;
while (maindisplaythread.IsAlive)
{
Thread.Sleep(3000); // update rate (default 500ms)
for (int i = 0; i < nirsdata.Count; i++)
{
try
{
if (nirsdata[i].data[0].Count > nFFT + 15)
{
double fs = MainClass.devices[i].GetSampleRate();
double[] SCI = new double[realtimeEngine.mBLLmappings[i].distances.Length];
for (int ch = 0; ch < realtimeEngine.mBLLmappings[i].distances.Length; ch++)
{
MathNet.Numerics.Complex32[] w1 = new MathNet.Numerics.Complex32[nFFT];
MathNet.Numerics.Complex32[] w2 = new MathNet.Numerics.Complex32[nFFT];
int ntps = nirsdata[i].data[realtimeEngine.mBLLmappings[i].measurementPairs[ch][0]].Count - 5;
double a = 0;
double b = 0;
int cc = 0;
for (int tpt = ntps - nFFT; tpt < ntps; tpt++)
{
w1[cc] = new MathNet.Numerics.Complex32((float)nirsdata[i].data[realtimeEngine.mBLLmappings[i].measurementPairs[ch][0]][tpt], 0f);
w2[cc] = new MathNet.Numerics.Complex32((float)nirsdata[i].data[realtimeEngine.mBLLmappings[i].measurementPairs[ch][1]][tpt], 0f);
a += nirsdata[i].data[realtimeEngine.mBLLmappings[i].measurementPairs[ch][0]][tpt] * nirsdata[i].data[realtimeEngine.mBLLmappings[i].measurementPairs[ch][0]][tpt];
b += nirsdata[i].data[realtimeEngine.mBLLmappings[i].measurementPairs[ch][1]][tpt] * nirsdata[i].data[realtimeEngine.mBLLmappings[i].measurementPairs[ch][1]][tpt];
cc++;
}
Fourier.Forward(w1);
Fourier.Forward(w2);
cc = 0;
for (double ii = -fs / 2; ii < fs / 2; ii += fs / nFFT)
{
if (Math.Abs(ii) < 0.5 | Math.Abs(ii) > 2)
{
w1[cc] = new MathNet.Numerics.Complex32(0f, w1[cc].Imaginary);
w2[cc] = new MathNet.Numerics.Complex32(0f, w2[cc].Imaginary);
}
w1[cc] = w1[cc] * w2[cc].Conjugate();
}
Fourier.Inverse(w1);
SCI[ch] = w1[(int)Math.Round((double)nFFT / 2)].Real / Math.Sqrt(a * b);
}
double[] avgDetVal = new double[nirsdata[i].probe.numDet];
int[] cnt = new int[nirsdata[i].probe.numDet];
for (int ch = 0; ch < nirsdata[i].probe.numDet; ch++)
{
cnt[ch] = 0;
avgDetVal[ch] = 0;
}
for (int ch = 0; ch < nirsdata[i].probe.numChannels / nirsdata[i].probe.numWavelengths; ch++)
{
int dIDx = nirsdata[i].probe.ChannelMap[ch].detectorindex;
cnt[dIDx]++;
avgDetVal[dIDx] += SCI[ch];
}
for (int ch = 0; ch < MainClass.win._handles.detectors.Count; ch++)
{
Gdk.Color col;
if (SCI[ch] < .3)
{
col = new Gdk.Color(255, 0, 0);
}
else if (SCI[ch] < .6)
{
col = new Gdk.Color(255, 255, 0);
}
else
{
col = new Gdk.Color(0, 255, 0);
}
MainClass.win._handles.detectors[ch].led.Color = col;
}
}
}
catch {
Console.WriteLine("Updating SCI error");
}
}
}
}
/// <summary>
/// Converts the string representation of a complex number to a single-precision complex number equivalent.
/// A return value indicates whether the conversion succeeded or failed.
/// </summary>
/// <param name="value">
/// A string containing a complex number to convert.
/// </param>
/// <param name="result">
/// The parsed value.
/// </param>
/// <returns>
/// If the conversion succeeds, the result will contain a complex number equivalent to value.
/// Otherwise the result will contain complex32.Zero. This parameter is passed uninitialized.
/// </returns>
public static bool TryToComplex32(this string value, out Complex32 result)
{
return(Complex32.TryParse(value, out result));
}
/// <summary>
/// Converts the string representation of a complex number to single-precision complex number equivalent.
/// A return value indicates whether the conversion succeeded or failed.
/// </summary>
/// <param name="value">
/// A string containing a complex number to convert.
/// </param>
/// <param name="formatProvider">
/// An <see cref="IFormatProvider"/> that supplies culture-specific formatting information about value.
/// </param>
/// <param name="result">
/// The parsed value.
/// </param>
/// <returns>
/// If the conversion succeeds, the result will contain a complex number equivalent to value.
/// Otherwise the result will contain Complex.Zero. This parameter is passed uninitialized.
/// </returns>
public static bool TryToComplex32(this string value, IFormatProvider formatProvider, out Complex32 result)
{
return(Complex32.TryParse(value, formatProvider, out result));
}
/// <summary>
/// Creates a <c>Complex32</c> number based on a string. The string can be in the
/// following formats (without the quotes): 'n', 'ni', 'n +/- ni',
/// 'ni +/- n', 'n,n', 'n,ni,' '(n,n)', or '(n,ni)', where n is a double.
/// </summary>
/// <returns>
/// A complex number containing the value specified by the given string.
/// </returns>
/// <param name="value">
/// the string to parse.
/// </param>
public static Complex32 ToComplex32(this string value)
{
return(Complex32.Parse(value));
}
/// <summary>
/// Creates a <c>Complex32</c> number based on a string. The string can be in the
/// following formats (without the quotes): 'n', 'ni', 'n +/- ni',
/// 'ni +/- n', 'n,n', 'n,ni,' '(n,n)', or '(n,ni)', where n is a double.
/// </summary>
/// <returns>
/// A complex number containing the value specified by the given string.
/// </returns>
/// <param name="value">
/// the string to parse.
/// </param>
/// <param name="formatProvider">
/// An <see cref="IFormatProvider"/> that supplies culture-specific
/// formatting information.
/// </param>
public static Complex32 ToComplex32(this string value, IFormatProvider formatProvider)
{
return(Complex32.Parse(value, formatProvider));
}
/// <summary>
/// Returns a Norm of the difference of two values of this type, which is
/// appropriate for measuring how close together these two values are.
/// </summary>
public static double NormOfDifference(this Complex32 complex, Complex32 otherValue)
{
return((complex - otherValue).MagnitudeSquared);
}
/// <summary>
/// Gets the squared magnitude of the <c>Complex</c> number.
/// </summary>
/// <param name="complex">The <see cref="Complex32"/> number to perform this operation on.</param>
/// <returns>The squared magnitude of the <c>Complex</c> number.</returns>
public static double MagnitudeSquared(this Complex32 complex)
{
return((complex.Real * complex.Real) + (complex.Imaginary * complex.Imaginary));
}
/// <summary>
/// Returns a Norm of a value of this type, which is appropriate for measuring how
/// close this value is to zero.
/// </summary>
public static double Norm(this Complex32 complex)
{
return(complex.MagnitudeSquared);
}
/// <summary>
/// Compares two doubles and determines if they are equal to within the specified number of decimal places or not. If the numbers
/// are very close to zero an absolute difference is compared, otherwise the relative difference is compared.
/// </summary>
/// <param name="a">The first value.</param>
/// <param name="b">The second value.</param>
/// <param name="decimalPlaces">The number of decimal places.</param>
public static bool AlmostEqualRelative(this Complex32 a, Complex32 b, int decimalPlaces)
{
return(AlmostEqualNormRelative(a.Norm(), b.Norm(), a.NormOfDifference(b), decimalPlaces));
}
/// <summary>
/// Checks whether two Compex numbers are almost equal.
/// </summary>
/// <param name="a">The first number</param>
/// <param name="b">The second number</param>
/// <returns>true if the two values differ by no more than 10 * 2^(-52); false otherwise.</returns>
public static bool AlmostEqualRelative(this Complex32 a, Complex32 b)
{
return(AlmostEqualNormRelative(a.Norm(), b.Norm(), a.NormOfDifference(b), DefaultSingleAccuracy));
}
/// <summary>
/// Compares two complex and determines if they are equal within
/// the specified maximum error.
/// </summary>
/// <param name="a">The first value.</param>
/// <param name="b">The second value.</param>
/// <param name="maximumError">The accuracy required for being almost equal.</param>
public static bool AlmostEqualRelative(this Complex32 a, Complex32 b, double maximumError)
{
return(AlmostEqualNormRelative(a.Norm(), b.Norm(), a.NormOfDifference(b), maximumError));
}
/// <summary>
/// Compares two complex and determines if they are equal within
/// the specified maximum error.
/// </summary>
/// <param name="a">The first value.</param>
/// <param name="b">The second value.</param>
/// <param name="maximumAbsoluteError">The accuracy required for being almost equal.</param>
public static bool AlmostEqual(this Complex32 a, Complex32 b, double maximumAbsoluteError)
{
return(AlmostEqualNorm(a.Norm(), b.Norm(), a.NormOfDifference(b), maximumAbsoluteError));
}