到達角估計是直接序列超寬帶系統(tǒng)的關(guān)鍵技術(shù)之一。傳統(tǒng)的到達角估計方法都基于窄帶信號，不能直接應(yīng)用在該系統(tǒng)。針對該問題，提出了一種基于四階累積量的到達角估計方法。該方法建立在直接序列超寬帶系統(tǒng)陣列信號的頻域模型。仿真結(jié)果表明該算法有效易行，能準確估計直接序列超寬帶信號的到達角。

Direction of Arrival (DOA) estimation is one of the key technologies of Direct Sequence Ultra Wide Bandwidth (DS-UWB) system. The traditional DOA estimation methods which are based on narrow-band signals are not suited for such system . So a fourth-order cumulant-based estimation method of DOA is proposed. This method is founded on the frequency domain model of DS-UWB array signals. The spatial spectral function is then derived for analysis. The performance of the estimation algorithm is evaluated by computer simulation and the results show that the algorithm is effective and can guarantee adequate estimation accuracy.