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在计算发射段的弹道参数时,运动方程通常投影在速度坐标系上。此时,只须知道θ和φ角。但有时要知道θ_α和φ_α角。这些角度由下式确定: sinθ=V_y/V;(6.1) sinφ=-V_z/Vcosθ;(6.2)
The equations of motion are usually projected on the velocity coordinate system in calculating the trajectory parameters of the launch section. In this case, only the θ and φ angles need to be known. But sometimes you need to know θ_α and φ_α angles. These angles are given by: sin θ = V_y / V; (6.1) sin φ = -V_z / V cos θ; (6.2)