Concept and Implementation of a PLL-Controlled Interlaced Chirp Sequence Radar for Optimized Range–Doppler Measurements
Concept and Implementation of a PLL-Controlled Interlaced Chirp Sequence Radar for Optimized Range–Doppler Measurements
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DOI：
10.1109/tmtt.2016.2599875
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发表时间：
2016-08
影响因子：
4.3
通讯作者：
K. Thurn;D. Shmakov;Gang Li;S. Max;M. Meinecke;M. Vossiek
中科院分区：
文献类型：
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作者：
K. Thurn;D. Shmakov;Gang Li;S. Max;M. Meinecke;M. Vossiek
在本文中，我们介绍了一种新的概念调频连续波雷达。该方法是基于一个交错的啁啾序列波形，这是由锁相环（PLL）控制。与通常用于产生快速啁啾的开环压控振荡器相比，PLL的使用提高了频率啁啾线性度并降低了相位噪声。与基本的距离-多普勒处理相比，它能够以相同的分辨率明确地检测更高的目标速度，这使得它适合于汽车应用。独立的频率合成器在系统中产生交错的斜坡。RF开关将这两个信号组合起来，以抑制振荡器过冲引起的瞬变，并避免PLL IC的编程时间引起的不相干。我们在K波段建立了一个原型雷达系统。测试结果是有希望的，预示着其他应用。
In this paper, we introduce a novel concept for frequency-modulated continuous-wave radar. The approach is based on an interlaced chirp sequence waveform, which is controlled by phase-locked loops (PLLs). The use of PLLs improves frequency chirp linearity and reduces phase noise compared with open-loop voltage-controlled oscillators commonly used to generate the fast chirps. In contrast to basic range-Doppler processing, it enables higher target velocities to be detected unambiguously at the same resolution, which makes it suitable for automotive applications. Separate frequency synthesizers generate the interlaced ramps in the system. An RF switch combines these two signals to suppress transients caused by oscillator overshoot and to avoid incoherencies due to programming times of the PLL ICs. We built a prototype radar system in K-band. The test results are promising and bode well for other applications.