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桥梁、隧道、边坡、路面等交通结构物在建造或运营过程中,会受到周围环境或交通载荷的长期反复作用,有效的交通结构物监测系统能在结构物损伤导致的灾害发生之前及时检测并发出预警信息。相对激光、红外、图像识别、力学等手段,基于雷达的交通结构物形变监测雷达具有不受气候条件影响的先天优势,本文基于调频连续波雷达测距的基本原理,从数学原理上分析了FFT变换、补零FFT、线性调频Z变换的频率测量精度及复杂度,推导证明了目标监测距离越远,雷达前端压控振荡器的非线性影响越大,及频率细化程度越高,同等信噪比条件下噪声引起的目标距离误判概率越大的结论。
Traffic structures such as bridges, tunnels, slopes and pavements may be repeatedly exposed to the environment or traffic load during their construction or operation. An effective traffic structure monitoring system can detect the disaster in time before the disaster caused by the structure And issued early warning information. Relative to the laser, infrared, image recognition, mechanics and other means, radar-based traffic structure deformation monitoring radar has inherent advantages not affected by climatic conditions. Based on the principle of FM continuous wave radar ranging, the mathematical analysis of the principle of FFT Transform, zero-padded FFT and linear frequency-modulated Z-transform. The derivation proves that the longer the target monitoring distance, the greater the nonlinear influence of the front-end voltage-controlled oscillator and the higher the frequency refinement, Noise ratio caused by the noise target distance misjudgment probability greater conclusion.