position_covariance_type

根据引用\[2\]中的信息，position_covariance_type是一个uint8类型的变量，用于表示位置协方差的类型。具体的取值如下：
- COVARIANCE_TYPE_UNKNOWN = 0
- COVARIANCE_TYPE_APPROXIMATED = 1
- COVARIANCE_TYPE_DIAGONAL_KNOWN = 2
- COVARIANCE_TYPE_KNOWN = 3

在引用\[1\]中的数据中，并没有明确给出position_covariance_type的值。因此，无法确定position_covariance_type的具体取值。
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