摘要
针对水下目标运动轨迹的测量问题,提出了一种小尺寸十字阵的高精度测向算法,该算法同时利用运动目标载体上产生的单频信号和线性调频信号估计水下运动目标时延;并对小尺寸十字阵的测向算法进行了理论分析和计算机仿真,分析了阵形尺寸、信噪比等参数对测向精度的影响。仿真结果表明:该测向算法具有尺寸小、精度高的特点,可用于水下目标运动轨迹和运动参数的测量。
In order to determine with higher resolution the direction of an underwater moving object, we propose making the signal, which is sent from object and received by a small-size cross array, different from the signals sent from the object in the past. We use a special signal which consists of both sine and LFM (linear frequency modulated) signals. We derived the equations needed for estimating time delay using phase message of this special signal. We performed simulations, using the proposed special signal and the equations derived for time delay estimation. On condition that the SNR (signal-to-noise ratio) is 20 dB, simulation results show preliminarily that: (1) the precision in determining direction of underwater moving object can be raised by one order of magnitude; (2) azimuth estimation error can be controlled to within 0.02°; (3) when elevation is less than 80°, its estimation error can be controlled to within 0.1°; (4) when allowable direction estimation error is less than 0.1°, the size of cross array can be smaller than 20 cm × 20 cm.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2005年第2期152-155,共4页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金项目(60372086)资助
关键词
十字阵
时延估计
高精度
Computer simulation
Errors
Estimation
Frequencies
Moving
Object recognition
Signal processing
Signal to noise ratio
