Hi Jun,
Thank you for evaluating FreeFlyer and your patience while we worked through your issue. Our Tech Support team has spent some time analyzing your Mission Plan’s (MP). We are happy to see you using the Orbit Determination (OD) abilities of FreeFlyer. We do have some suggestions to help in simplifying your MP and evaluating your results.
To recap, you have three separate MP’s; the first is to setup your spacecraft and export the state vector as an ephemeris. Then the second MP is used to apply the Black Jack point solution data file to the ephemeris file using a Kalman Filter tool. The final MP then uses the Tracking Data Editor to generate a new Black Jack point solution data file from the original Black Jack point solution. Although,
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I have attached the edited version of your mission plan to this email. You can use the same data files that you sent in your original email to create your spacecraft and load the Black Jack point solution file. The first portion of your MP I modified on your MP is I commented out the Report Kalman Filter epoch and the Report Spacecraft’s semi-major axis in the script. I then had FreeFlyer instead plot the Pre & Post residuals vs the epoch for your Kalman Filter. This is seen in lines 11 thru 16 of the attached edited mission plan. Once the mission was reporting the Pre residuals it was evident that your initial Kalman Apriori State started ~5 (km) out of the expected position. This was causing issue with the Kalman Filter accepting the data due to the defined Sigma values of .05 (km); which caused the initial state to not be properly processed in the filter. I have included a description for each additional modified portion …show more content…
o In your spacecraft GUI there is a tab for the propagator step size (Spacecraft1 Motion Model Propagator Step Size) set to 300 seconds, where as your Kalman Filter step size is only 60 seconds. The Spacecraft step size should be identical to the Kalman Filter step size. This is mainly due to the Kalman Filter step size taking precedent in FreeFlyer and wanting to ensure that the spacecraft propagation is synced with the Kalman Filter. o Also under the “Motion Model” you are using 22 Zonal and Tesseral potential fields and the “Analytic” density model. Although this is not incorrect you would receive a better estimate if you used the Jacchia Roberts density model and increased your Zonals to a larger number. I have updated the Zonals and Tesserals, in the attached MP, to use 40
However, as previously mentioned, we didn't account for real life varibles in this. We made sure to watch for these numbers so we can see how they play a role in our launches. So when doing calculations, we relayed these variables into our calculations to change our outcome of barely missing the Cairo to Sinking the Cairo. This taught me that finding consistancies in data, especially errors, is very important so you can adjust your work to account for this and change your outcome into an outcome of certainty and
1) Once the simulation opens, click on ‘Show Both’ for Velocity and Acceleration at the top of the page. Now click and drag the red ball around the screen. Make 3 observations about the blue and green arrows (also called vectors) as you drag the ball around.
After the 10 month cruise through the uncharted territory of interplanetary space, the Viking orbiter began to transmit full photos of the red planet. Five days after the photos were transmitted, the orbiter made it successfully into the gravitational
(1.5 pts) Find Takeoff Speeds: V1, V2, VR (see Figure 11-25). Assume Min Speed due to VMCG Requirements is OK.
Space exploration is one of the most interesting concepts since the knowledge of space. Humans have always wanted to know what lies beyond our planet and what the mysterious world “out there” has to offer. In 1959, mankind was able to partially accomplish this feat by crashing an object
NASA - NSSDC - Spacecraft - Details. 2015. NASA - NSSDC - Spacecraft - Details. [ONLINE] Available at:http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1966-020A. [Accessed 10 June 2015].
disp(' This value must be greater than zero ( a satelite can''t orbit at a planet''s radius )')
The purpose of this document is to provide a basic overview of the current status surrounding the AcuScan Optimization Project. This document will provide a brief background and summary of the current situation, and then provide key points relating to the underlying issues. This document will then outline the options AcuScan has in order to address the project issues and recommend the most feasible course of action.
In one complete orbit, the magnitude of the displacement is not the same as the distance traveled. The magnitude of the dispacement is zero because you ended up at the same point
Eikmeier successfully argues the identification of friendly and enemy “centers of gravity” (COG) is illogically placed within the Operational Design process of JP 5-0. He astutely asserts changing the location of COG identification in the process increases accuracy.
P-58-C quickly punched it with his thin, sticky finger and instantly the craft came to a halt. Zero dragged a long, slender pointer across an extensive map until he found the desired location and showed his partner. It was his first mission, and would not be completed for millions of years. After exchanging a few hiccups and screeches, P-58-C steered the spacecraft towards a tiny, red planet. The planet grew closer and closer as the spacecraft continued to slow. When the craft was close enough to it, the reddish-brown globe’s gravity began to work on the vehicle. P-58-C, an expert in his craft, steered away from the planet, flipping switches and pressing buttons with agile fingers. After about a minute of adjusting, the craft was hovering safely above the
There was one outlier incorporated in the data that I did not include but it had big change in mass because maybe they did not follow the procedure properly. Procedure 2: The final mass and initial mass from procedure 2, the initial mass and final mass numbers were very close to each other, but as a class everyone had different results but they are a few commons. This maybe because the wind or the electronic balance was not set at
Can you feel it, drone-thusiasts? Lift off is only one card away! The anticipation must be killing you. RubiQ has put you through the ringer and you’ve picked up the gauntlet and worn it with honor — you’ve come a long way. But, you still need to cover some of the key components responsible for getting your drone off the ground. RubiQ might be capable of flight, but right now, she’s blindfolded, and there’s a whole wide world out there for her to bump into. Luckily, there’s a remedy. From adjusting the accelerometer to ensure proper speed and acceleration to setting the magnetometer to the particular declination of your exact location, a lot of calibration still remains. Are you ready to give RubiQ the power of sight? Get ready — this is the
Now, having a cleaner data my next step was to begin the Velocity Analysis process. I picked my velocities based on what flattened the data the best while staying true to the principle that velocity should increase with depth. Figure 4 displays a section of my velocity pickings while Figure 5 shows the resulting Velocity Section.
Jessica Vandeveventer Angela Morrow Baker SCI 155 3 February 2016 Projectile Motion Lab Purpose/Question- The purpose of this lab activity is to explore how mass is effected by the theory of gravity. Hypothesis– Whether the object is rolled slowly, rolled fast, or dropped, they are going to hit the ground in the same amount of time.