PRIMARY FLIGHT SAFETY MODELS

Primary Flight Safety Models

DebRA

Debris Risk Assessment (DebRA) is an APT developed model for flight safety analysts that assesses the risks of RLV (Reusable Launch Vehicle) failure modes ... more

Impact

A debris prediction program originally developed by the Aerospace Corporation to model the characteristics of debris resulting from kinetic energy intercepts or explosive breakups. Impact predicts the quantity, size/mass, induced velocity and drag characteristics of debris fragments resulting from user input scenarios. The program distributes fragments/velocities to assure conservation of mass and momentum. This program is widely used to predict collision effects.

MILS

Multiple Impact Location Simulator (MILS) is a fast-running trajectory simulation which uses a fourth order Runge-Kutta integration algorithm to propagate debris fragments resulting from either collision or flight termination. The program applies delta velocity isotropically around the original state vector or reads delta velocity for individual fragments from an IMPACT output file. Wind effects are incorporated into the forces modeled at each integration step. The resolution of the wind input file is user specified. This tool has been used by safety personnel to analyze test scenarios for the GBI, Arrow, and NMD programs.

DASP

Debris Analysis for Satellite Programs (DASP) is an APT modification to the Jet Propulsion Laboratory's Artificial Satellite Analysis Program (ASAP) for high accuracy prediction of orbital flight paths. DASP predicts the orbital characteristics of debris clouds generated by on-orbit breakups and kinetic energy intercepts. DASP applies velocity and drag changes (specified by the user) to the original orbital parameters and propagates the debris cloud using an eighth order Runge-Kutta algorithm and a 40x40 gravity field to integrate the equation of motion. This tool has been used to evaluate debris from exo-intercepts.

TVIP

Turning Vehicle Impact Predictor (TVIP) calculates malfunction turns in any direction based on current state vector, velocity profile, and maximum lateral acceleration capability. This program propagates trajectories to impact from points along the computed turn. It determines worst-case turns and defines hazard areas as part of planning test scenarios. This model has been used to support Arrow test planning.

Ascent

Ascent is a tool developed by Autometric that provides powerful trajectory modeling, end condition targeting, and optimization capabilities. Extensive functionality and graphical user interface allows the user to directly model the vehicle, optimize the trajectory, and transfer the resulting maps, charts, and summary statements into presentation charts or documents.

STK

Satellite Toolkit (STK) is a COTS satellite analysis model that addresses all phases of a satellite's life-cycle from policy development and design to launch and maintenance operations. STK Communications software provides a Windows interface and allows the analyst to compute a detailed link margin quickly and accurately.

LiMAns

Link Margin Analysis (LiMAns) is a link margin analysis tool that incorporates the basic gains and losses to determine the link margin from a ground station to any space point or vice versa.

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