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在频谱分析领域，背景均衡技术已被广泛地研究过．已经证明，这种方法对改善线谱检测是有效的．在数字多波束声呐系统中，方位历程显示是信号处理模块和显控模块之间最重要的界面。已经证明，声呐处理系统的增益最容易在不同的信号处理模块接口处丢失．背景均衡技术可以改善方位历程显示的总体性能，将多波束数据的后置处理结果在送至显示器之前首先进行滤波．本文提出的中值滤波和排序截断平均（ＯｒｄｅｒＴｒｕｎｃａｔｅＡｖｅｒａｓｅ，ＯＴＡ）相结合的方法利用可变长的窗口匹配不同主瓣宽度的波束图是一种对不均匀、非平稳背景的有效均衡技术．系统模拟结果表明，此方法对于多波束非均匀背景的均衡是非常有效的。
In the field of spectrum analysis, background equalization techniques have been extensively studied. It has been shown that this method is effective for improving line profiling. In a digital multibeam sonar system, the azimuth display is the most important interface between the signal processing module and the display control module. It has been demonstrated that the gain of the sonar processing system is most easily lost at different signal processing module interfaces. Background equalization improves the overall performance of the azimuth display and filters the post-processing results of the multi-beam data first before sending it to the display. The proposed method combining median filtering with Order TruncateAverase (OTA) uses a variable-length window to match beamforms of different mainlobe widths, which is an effective equalization technique for uneven and non-stationary background. The simulation results show that this method is very effective for the equalization of multi-beam non-uniform background.