phased.StretchProcessor
线性FM波形的拉伸处理器
描述
TheStretchProcessorobject performs stretch processing on data from a linear FM waveform.
To perform stretch processing:
Define and set up your stretch processor. SeeConstruction.
Call
step根据输入数据进行伸展处理，根据phased.StretchProcessor. The behavior ofstep是specific to each object in the toolbox.
Note
Starting in R2016b, instead of using thestep执行由System Object™定义的操作的方法，您可以用参数调用对象，就好像它是函数一样。例如，y = step(obj,x)和y = obj(x)perform equivalent operations.
Construction
h =分阶段创建一个拉伸处理器系统对象，H. The object performs stretch processing on data from a linear FM waveform.
H=分阶段。Name,Value)H，有一个或多个指定的其他选项Name,Value配对参数。Name是aproperty name， 和价值是相应的值。Name必须出现在单引号中（''). You can specify several name-value pair arguments in any order asName1,Value1,…,NameN,ValueN.
Properties
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Sample rate Signal sample rate, specified as a positive scalar. Units are Hertz. The ratio of sample rate to pulse repetition frequency(PRF)must be a positive integer — each pulse must contain an integer number of samples. This property can be specified as single or double precision. Default: |
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Pulse width 将每个脉冲（以秒为单位）的长度指定为正标量。价值必须满足 Default: |
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脉冲重复值的来源 Source of the PRF values for the stretch processor, specified as Default: |
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Pulse repetition frequency Pulse repetition frequency (PRF) of the received signal, specified as a positive scalar. Units are in Hertz. This property can be specified as single or double precision. Dependencies要启用此属性，请设置 Default: |
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FM sweep slope 将线性FM的斜率指定为标量。 Default: |
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FM扫描间隔的位置 Specify the linear FM sweeping interval using the value Default: |
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信号传播速度 Specify the propagation speed of the signal, in meters per second, as a positive scalar. You can specify this property as single or double precision. Default:Speed of light |
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拉伸处理的参考范围 Specify the center of ranges of interest, in meters, as a positive scalar. The reference range must be within the unambiguous range of one pulse. This property can be specified as single or double precision. This property is tunable. Default: |
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Span of ranges of interest Specify the length of the interval for ranges of interest, in meters, as a positive scalar. The range span is centered at the range value specified in the Default: |
例子
使用拉伸处理检测目标
Use stretch processing to locate a target at a range of 4950 m.
Simulate the signal.
waveform = phased.LinearFMWaveform; x = waveform(); c = physconst(“ Lightspeed”）；RNG = 4950.0;num_samples = round（rng/（c/（2*waveform.samplerate）））;x =庭院（x，num_samples）;
执行拉伸处理。
stretchproc = getStretchProcessor(waveform,5000,200,c); y = stretchproc(x);
绘制所得信号的频谱。
[Pxx,F] = periodogram(y,[],2048,stretchproc.SampleRate,'centered'）；图（f/1000,10*log10（pxx））网格xlabel（“频率（kHz）”）ylabel（'Power/Frequency (dB/Hz)'） 标题（“周期图功率谱密度估计”)
检测范围。
[〜，rngidx] = findpeaks（pow2db（pxx/max（pxx）），'MinPeakHeight'，-5）;rngfreq = f（rngidx）;rng = stretchfreq2rng（rngfreq，stretchProc.StrendProc.StrendProc.Referencerange，c）
rng = 4.9634e+03
算法
参考
[1]理查兹，M。A.雷达信号处理的基本面. New York: McGraw-Hill, 2005.
Extended Capabilities
Version History
