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首页> 外文期刊>IEEE Transactions on Aerospace and Electronic Systems >Doppler visibility of coherent ultrawideband random noise radar systems
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Doppler visibility of coherent ultrawideband random noise radar systems

机译：相干超宽带随机噪声雷达系统的多普勒能见度

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摘要

Random noise radar has recently been used in a variety of imaging and surveillance applications. These systems can be made phase coherent using the technique of heterodyne correlation. Phase coherence has been exploited to measure Doppler and thereby the velocity of moving targets. The Doppler visibility, i.e., the ability to extract Doppler information over the inherent clutter spectra, is constrained by system parameters, especially the phase noise generated by microwave components. Our paper proposes a new phase noise model for the heterodyne mixer as applicable for ultrawideband (UWB) random noise radar and for the local oscillator in the time domain. The Doppler spectra are simulated by including phase noise contamination effects and compared with our previous experimental results. A genetic algorithm (GA) optimization routine is applied to synthesize the effects of a variety of parameter combinations to derive a suitable empirical formula for estimating the Doppler visibility in dB. According to the phase noise analysis and the simulation results, the Doppler visibility of UWB random noise radar depends primarily on the following parameters: 1) the local oscillator (LO) drive level of the receiver heterodyne mixer, 2) the saturation current in the receiver heterodyne mixer, 3) the bandwidth of the transmit noise source, and 4) the target velocity. Other parameters such as the carrier frequency of the receiver LO and the loaded quality factor of the LO have a small effect over the range of applicability of the model and are therefore neglected in the model formulation. The Doppler visibility curves generated from this formula match the simulation results very well over the applicable parameter range within 1 dB. Our model may therefore be used to quickly estimate the Doppler visibility of random UWB noise radars for trade-off analysis
机译：随机噪声雷达最近已用于各种成像和监视应用中。使用外差相关技术可使这些系统相位相干。已经利用相位相干来测量多普勒，从而测量运动目标的速度。多普勒可见度，即在固有杂波频谱上提取多普勒信息的能力，受到系统参数的限制，特别是微波分量产生的相位噪声。本文为外差混频器提出了一种新的相位噪声模型，适用于超宽带（UWB）随机噪声雷达和时域本地振荡器。通过包括相位噪声污染效应来模拟多普勒频谱，并将其与我们之前的实验结果进行比较。应用遗传算法（GA）优化例程综合各种参数组合的效果，以得出合适的经验公式，以dB估算多普勒能见度。根据相位噪声分析和仿真结果，UWB随机噪声雷达的多普勒可见度主要取决于以下参数：1）接收机外差混频器的本振（LO）驱动电平，2）接收机中的饱和电流外差混频器，3）发射噪声源的带宽和4）目标速度。其他参数（例如接收器LO的载波频率和LO的加载质量因数）在模型的适用范围内影响很小，因此在模型公式中被忽略。根据该公式生成的多普勒可见度曲线在1 dB以内的适用参数范围内与仿真结果非常吻合。因此，我们的模型可用于快速估计随机UWB噪声雷达的多普勒能见度，以进行权衡分析

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