定位相关消息是:geometry_msgs/PoseArray，调用rosmsg info geometry_msgs/PoseArray显示消息内容如下:
std_msgs/Header header
uint32 seq
time stamp
string frame_id
geometry_msgs/Pose[] poses #预估的点位姿组成的数组
geometry_msgs/Point position
float64 x
float64 y
float64 z
geometry_msgs/Quaternion orientation
float64 x
float64 y
float64 z
float64 w
