分析了雷达空间谱估计中用于判断信号源数的方法。对于采用线性调频中断连续波（FMICW）体制的高频地波雷达，实际应用中信号源数目、信噪比及分离角度存在许多不确定性，为了更有效地提取信号源信息，文中提出一种新的判断算法。首先对盖氏圆盘半径进行收缩处理，同时采取加权平均的方法，得到新的判断标准（NEGDE），通过计算机模拟实验，有效解决了工程实际应用问题。

In this paper, the effective uses of Gerschgorin radii for source number detection is introduced. For HF ground wave radar under the FMICW scheme, a new improved Gerschgorin radii method (NEGDE) for source number detection is proposed to obtain the DOA information from the uncertainty of source number, signal-to-noise ratio and separated angle efficiently . Firstly, the covariance matrix is transformed with a unitary matrix to deflate the radii. Then, the criterion of Gerschgorin radii is modified with weigh and averaging. The result of computer simulation shows that this new method can solve the problem well.

TN957.51

国家863计划资助项目（2001AA631050）