| 摘要: |
| 传统基于相干积分结果最大值检测的开环信号到达时间（Time of Arrival,TOA）估计方法性能受限于采样率，TOA估计分辨率无法突破采样间隔限制。针对这一问题，提出一种基于定时曲线匹配拟合的开环TOA估计方法，通过将相干积分结果与定时曲线进行最优匹配拟合来估计信号到达时间。以直接序列扩频信号三角形定时曲线为例，首先基于相干积分结果和定时曲线构建拟合误差平方和模型，然后采用牛顿迭代法，通过最小化拟合误差平方和，实现对信号到达时间的最小二乘估计，最后评估了检测信噪比和采样率对估计精度的影响。与传统方法相比，所提方法能够将TOA估计误差的标准差降低50%~97%。该方法可推广应用于其他类型定时曲线。 |
| 关键词: TOA估计 开环 定时曲线 拟合误差 牛顿迭代 |
| DOI：10.20079/j.issn.1001-893x.240317001 |
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| 基金项目: |
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| Burst Pulse Open-loop TOA Estimation Based on Timing Curve Matching and Fitting |
| LUO Zhibin,ZHANG Xinran,QIAN Dong,ZHAO Dayong,FANG Tao,HUANG Yulong |
| (1.Southwest China Institute of Electronic Technology,Chengdu 610036,China;2.Institute of Electronic Engineering of CAEP,Mianyang 621054,China;3.Unit 93216 of PLA，Beijing 100089,China;4.College of Intelligent Systems Science and Engineering,Harbin Engineering University,Harbin 150001,China) |
| Abstract: |
| The performance of the traditional open-loop time of arrival(TOA) estimation method,which is based on the maximum detection of coherent integration results,is limited by the sampling rate.This limitation manifests as the TOA estimation resolution being unable to surpass the constraints of the sampling interval.To address this issue,a novel open-loop TOA estimation method based on timing curve matching and fitting is proposed.This method estimates the signal arrival time by optimally matching and fitting the coherence integration results with a timing curve.Taking the triangular timing curve of direct sequence spread spectrum signal as an example,a model of the sum of squared fitting errors is constructed based on coherent integration results and the timing curve.Newton搒 iterative method is then employed to minimize the sum of squared fitting errors,achieving a least squares estimation of the signal arrival time.Finally,the effects of detection signal-to-noise ratio and sampling rate on estimation accuracy are evaluated.Compared with the traditional method,the proposed method reduces the standard deviation of TOA estimation errors by 50% to 97%.Furthermore,this method can be extended to other types of timing curves. |
| Key words: TOA estimation open-loop timing curve error of fitting Newton iteration |
