The location reporting service provided by RDSS of Beidou navigation satellite system allows users to inform the outside world of their positions, and it has been widely used in water conservancy, marine, marine fisheries, forest fire prevention, disaster relief and other fields.Beidou RDSS positioning requires high-precision elevation data of users.However, the high-precision elevation data is difficult to acquire in remote regions and areas outside mainland China.To solve this problem, an RDSS positioning model without elevation is designed.When more than two RDSS satellites are observed, the redundant observation satellites are used to carry out positioning, instead of elevation, and the positioning error in this model is analyzed.Simulation experiment indicates that the DOP value and positioning error of RDSS positioning without elevation are much larger.Under the same pseudo-range error, the positioning error increases exponentially with the user position latitude increasing.The longitude error in positioning results is far less than the errors in latitude and elevation.%北斗卫星导航系统RDSS(Radio Determination Satellite Service)导航体制中的定位报告服务由于允许用户向外界通报自己的位置,在水利、海事、海洋渔业、森林防火、搜索救灾等领域得到了广泛应用.北斗RDSS定位需要高精度高程数据的支持,对于偏远地区或中国境外地区将难以获得高精度高程数据.设计一种无需高程库的RDSS定位模型,当用户观测RDSS卫星个数超过2个时,利用多余的观测卫星代替高程进行定位,并对该模型下的定位误差进行了分析.模拟实验表明,无高程RDSS定位的DOP值较大,定位误差较大;相同伪距误差下,定位误差随用户位置纬度增加而指数增加;定位结果中的经度误差远小于纬度和高程的误差.
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