IMPROVEMENT OF MULTI-BEAM STRIPE SPLICING EFFECT BASED ON TOPOGRAPHIC SPECTRUM ANALYSIS
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摘要:
针对多波束测深系统条带拼接中的系统性残差问题，提出基于地形频谱分析的方法来削弱系统性残余误差的影响。该方法相对于传统的拼接方法，无需进行相邻条带ping(激发)连续匹配，避免ping误匹配所产生的地形长波项不符的问题，并且所采用的多面函数不仅可获得所测条带的重叠区长波项信号，还可获得非重叠区的拟合信号。结果表明，采用地形频谱分析法所处理后，多波束测深数据残余误差的影响得到了显著的削弱，拼接精度显著提升。
Abstract:Systematic residue is a common problem in strip splicing of the multi-beam sounding system. We proposed in this paper a method to weaken the influence of the systematic residual error based on the topographic spectrum analysis. A comparison is also made with the traditional method. Different with the traditional method, this method does not require continuous matching of adjacent strip ping, and thus we may avoid inconsistent problem of terrain long wave caused by ping mismatching. In addition, polyhedral function can be obtained by measuring the wave band overlap region, and signal can also be fitted signal non overlap ping regions. The evaluation indexes of the optimal parameters can effectively evaluate the short wave term and the long wave term signal. And the multifaceted function can not only obtain the overlap ping region long wave term signals of the measured strip, but also the fitting signal of the non-overlap ping region. The experimental results show that the impact of the residual error of the sounding data processed by the topographic spectrum analysis method has been greatly improved.
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Key words:
- terrain spectrum analysis /
- multi beam strip splicing /
- residual error
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表 1 3种评价指标对不同小波基和分解层数的评价结果
Table 1. The evaluation results of 3 evaluation indexes for different wavelet bases and decomposition layers are given
小波基函数 分解层数 均方差/m 信噪比 平滑度 Db6 3 1.014 62.738 0.072 5 1.165 61.535 0.056 Sym 3 1.007 62.798 0.074 5 1.157 61.597 0.060 Coif 3 1.004 62.820 0.075 5 1.155 61.607 0.060 
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表 2 整个测区各区域的统计参数
Table 2. Statistical parameters of the whole area
测区区域 条带编号 节点个数/个 拟合中误差/m 程序时间损耗/s Area 1 1-5 702 1.766 8 145.382 Area 2 5-9 114 2 2.024 6 409.135 Area 3 9-12 114 1 2.007 6 403.202 Area 4 15-18 140 6 2.039 4 727.538 …… …… …… …… ……
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表 3 残余误差削弱评估参数
Table 3. Statistic evaluation parameters of residual errors
实验 改正状态 最大偏差/m 最小偏差/m 均值/m 标准差/m 实验1(相邻条带的
40ping对测深数据)改正前 8.000 0 -11.200 0 -0.867 4 3.052 0 改正后 5.606 4 -4.791 5 -0.026 3 1.643 4 实验2(整个测区
条带综合处理)改正前 18.804 9 -19.767 7 -1.973 0 4.401 5 改正后 6.368 0 -7.237 3 -0.070 5 1.940 0 快速傅里叶变换方法
(整个测区条带综合处理)改正前 36.560 -21.711 2.859 4.730 改正后 14.937 -9.992 0.704 2.645
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