## A study of guidance sensitivity for various low-thrust transfers from Earth to Mars |

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320 Transfer adjoint solution angular velocity boundary conditions Characteristics of adjoint coast period comparative error analysis constant-thrust program continuous functions coplanar days Figure denotes effect of initial Effect of transfer error coefficients error in thrust eter variations final mass fraction final parameter variations final velocity fundamental guidance equation guidance errors guidance problem guidance sensitivity initial thrust-weight ratio initial velocity errors integral Lagrangian multipliers low-thrust mission low-thrust vehicles m/sec Mars using optimum meters per second NOMINAL TRAJECTORY parameter variation occurring perturbation theory planetary orbits plotted propulsion parameters radial position errors radial velocity radian ratio on guidance reference trajectory Rocket root mean square scalar product Sensitivity coefficients Sensitivity of final specific impulse study the guidance thrust angle thrust errors thrust magnitude thrust program thrust variations thrust vector errors tical tion trajectory characteristics trajectory parameter variations transfer angle transfers between Earth velocity and position weighting functions weighting matrix