function [Mission_Param, Environment_Param, Normalized_Param] = paraSet()
% global Mission_Param Environment_Param Normalized_Param

%% 环境参数
Re  = 6371004;   % Earth radius (m)
g0  = 9.801;     % gravitational acceleration at Re (m/s^2)
M0  = 1500;      % initial mass (Kg)
Isp = 2000;      % engine specific impulse (s)
m0  = 1;         % normalized initial mass
T   = 1;         % thrust magnitude (N)

%% 归一化
Lscale = Re;
Vscale = sqrt(Re*g0);
tscale = sqrt(Re/g0);
mscale = M0;
Fscale = M0*g0;

%% 约束
Mission_Param.P0  = 11623000/Re;
Mission_Param.ex0 = 0.75;
Mission_Param.ey0 = 0;
Mission_Param.hx0 = 0.0612;
Mission_Param.hy0 = 0;
Mission_Param.L0  = pi;

Mission_Param.Pf  = 42165000/Re;
Mission_Param.exf = 0;
Mission_Param.eyf = 0;
Mission_Param.hxf = 0;
Mission_Param.hyf = 0;

%% 环境
Environment_Param.Re  = Re;
Environment_Param.g0  = g0;
Environment_Param.M0  = M0;
Environment_Param.Isp = Isp;
Environment_Param.m0  = m0;
Environment_Param.T   = T/Fscale;
Environment_Param.c   = Isp*g0/sqrt(Re*g0); % Isp*g0/Vscale

%% 归一化
Normalized_Param.Lscale = Lscale;
Normalized_Param.Vscale = Vscale;
Normalized_Param.tscale = tscale;
Normalized_Param.mscale = mscale;
Normalized_Param.Fscale = Fscale;

end