雷达目标Properties

这分阶段System object™ models a reflected signal from a target. The target may have a nonfluctuating or fluctuating radar cross section (RCS). This object has the following modifiable properties:

Gain for Nonfluctuating RCS Target

Create a radar target with a nonfluctuating RCS of 1 square meter and an operating frequency of 1 GHz. Specify a wave propagation speed equal to the speed of light.

笔记：This example runs only in R2016b or later. If you are using an earlier release, replace each call to the function with the equivalent步句法。例如，替换myObject（x）和步(myObject,x)。

sigma = 1.0; target = phased.RadarTarget('Model'，，，，“非推翻”，，，，“平均值”，Sigma，...“繁殖速度”，physconst（'LightSpeed'），'OperatingFrequency'，1E9）;

For a nonfluctuation target, the reflected waveform equals the incident waveform scaled by the gain

Here, σ represents the mean target RCS, and λ is the wavelength of the operating frequency.

将目标入射在目标上设置为矢量，以获取由分阶段System object™.

x =一个（10,1）;y =目标（x）

y =10×111.8245 11.8245 11.8245 11.8245 11.8245 11.8245 11.8245 11.8245 11.8245 11.8245

计算从公式的增益，以验证系统对象的输出是否等于理论值。

lambda = target.propagationspeed/target.operatingFquermency;g = sqrt（4*pi*sigma/lambda^2）

G=11.8245

RCS目标波动

前面的例子使用nonfluctuating f值or the target's RCS. This model is not valid in many scenarios. There are several cases where the RCS exhibits relatively small or large magnitude fluctuations. These fluctuations can occur rapidly on pulse-to-pulse, or more slowly, on scan-to-scan time scales:

为了说明RCS中的显着波动，您需要使用统计模型。四个摇摆下表中描述的模型被广泛用于涵盖这些类型的波动RCS案例。

您可以通过设置Model财产。使用步method and set theUpdatercs输入参数到trueor错误的。环境Updatercs至true每次调用时，根据指定的概率模型更新RCS值步。我f you setUpdatercs至错误的，，，，the previous RCS value is used.

Model Pulse Reflection From Nonfluctuating Target

此示例创建并以1 GHz载体频率来创建线性FM波形。波形通过具有反覆盖反应的各向同性天线传输和收集。波形传播距离距离，其非裂解RC为1平方米。该目标位于距天线的1.414公里范围内，方位角为45°，高度为0°。

笔记：This example runs only in R2016b or later. If you are using an earlier release, replace each call to the function with the equivalent步句法。例如，替换myObject（x）和步(myObject,x)。

Set up the radar system.

antenna = phased.IsotropicAntennaElement('BackBaffled'，，，，true); antennapos = phased.Platform('初始位置'，[0; 0; 0]）;targetpos = phase.platform（'初始位置'，[1000;1000;0]）;waveform = phase.linearfmwaveform（“脉冲宽”，100E-6）;发射机= phased.Transmitter（'峰值功率'，1E3，'获得'，，，，40); radiator = phased.Radiator('OperatingFrequency'，1E9，...'传感器'，天线）;channel = phased.FreeSpace('OperatingFrequency'，1E9，...'TwoWayPropagation'，，，，true); target = phased.RadarTarget(“平均值”，1，'OperatingFrequency'，1E9）;collector = phasted.collector（'OperatingFrequency'，1E9，...'传感器'，天线）;

Compute the transmitted and received waveforms

wav = waveform（）;txwav = transmitter（wav）;radwav =散热器（txwav，[0 0]'）;propwav =通道（radwav，antennapos.initialposition，...targetPos.InitialPosition，[0; 0; 0]，[0; 0; 0]）;reflwav = target（propwav）;collwav = collector（reflwav，[45 0]'）;