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提出新的露天矿GNSS/伪卫星组合定位系统的结构优化模型。通过引入空间位置精度因子(Pdop)与可靠性作为优化指标,建立多目标优化模型用于选择伪卫星的最优位置。在考虑实际环境的情况下,建立以方位角(a)、高度角(e)和历元(t)为自变量,Pdop为因变量的四维模型,并用于最优伪卫星布设带的选择。通过分析Pdop随时间的变化特征,最终确定最优的伪卫星布设位置。利用中国矿业大学校园内实测的天宝R8GPS数据测试模型的有效性,评价系统结构指标的变化规律,并将该模型用于抚顺矿业集团的西露天矿GNSS/伪卫星系统布设试验。通过模型优化可在降低成本的同时提高集成系统的整体性能,分析表明Pdop与可靠性都得到了有效提高。
A new structural optimization model of GNSS / Pseudolite combination positioning system is proposed. By introducing the Pdop and reliability as the optimization indexes, a multi-objective optimization model is established to select the optimal position of the pseudolite. Considering the actual environment, a four-dimensional model with azimuth (a), altitude (e) and epoch (t) as independent variables and Pdop as dependent variable was established and used to select the optimal pseudolite band. By analyzing the characteristics of Pdop over time, the optimal location of pseudolite is finally determined. The validity of the test model of Tempo R8GPS data measured on the campus of China University of Mining and Technology was used to evaluate the variation regularity of system structure index. The model was applied to the GNSS / Pseudo-satellite system deployment test of western open pit mine of Fushun Mining Group. Through optimization of the model, the overall performance of the integrated system can be improved while reducing the cost. The analysis shows that the Pdop and the reliability are effectively improved.