CAJ | 학술논문

针对压控振荡器调频非线性误差的准确估计与校正问题，提出一种以一维距离像对比度最优为准则的自适应估计与校正方法。本方法建立引入温度变量的压控振荡器频率特性模型，并据此估计出某一温度值对应的调频非线性误差，在对中频回波进行误差补偿和一维脉压后，以一维距离像的对比度最优作为迭代收敛准则，实现调频非线性误差的最优估计与校正。仿真和实测数据结果表明，该方法充分考虑了温度因素对压控振荡器输出频率的影响，能够在不增加硬件复杂度的前提下，通过算法实现对调频非线性误差的估计、跟踪与补偿。与传统基于硬件电路进行估计或校正的方法相比，新方法无需由硬件组成闭环估计通道，且具有实时性强、运算量小、补偿精度高的优点，对于克服实际工程应用中压控振荡器器件的参数漂移问题具有重要指导意义。
침대압공진탕기조빈비선성오차적준학고계여교정문제，제출일충이일유거리상대비도최우위준칙적자괄응고계여교정방법。본방법건립인입온도변량적압공진탕기빈솔특성모형，병거차고계출모일온도치대응적조빈비선성오차，재대중빈회파진행오차보상화일유맥압후，이일유거리상적대비도최우작위질대수렴준칙，실현조빈비선성오차적최우고계여교정。방진화실측수거결과표명，해방법충분고필료온도인소대압공진탕기수출빈솔적영향，능구재불증가경건복잡도적전제하，통과산법실현대조빈비선성오차적고계、근종여보상。여전통기우경건전로진행고계혹교정적방법상비，신방법무수유경건조성폐배고계통도，차구유실시성강、운산량소、보상정도고적우점，대우극복실제공정응용중압공진탕기기건적삼수표이문제구유중요지도의의。
In order to accurately estimate and correct the frequency nonlinearity of voltage controlled oscillator,a novel approach based on contrast optimization of range profiles is proposed,which will perform nonlinearity estimation and correction adaptively.A temperature-varying tuning model is established in the proposed method,the nonlinearity is obtained with a given temperature by using this model.The nonlinearity is removed from the beat signal,and the range profiles of targets are derived by pulse compression.According to the contrast of range profile,the real temperature is iteratively estimated.The contrast of range profile will converge toward the maximum,so an optimal estimation of temperature,which is nonlinearity,is achieved.Simulation and experimental results show that the proposed approach with consideration on environmental temperature variation can estimate and correct the nonlinearity without any additional hardware circuit.Compared with the conventional approaches,this method can not only accurately estimate and track the frequency nonlinearity of voltage controlled oscillator in real-time,but also has low hardware complexity and computing cost,which is the significant to solve the problem of voltage controlled oscillator frequency drift.