Rank: 363 based on 188 downloads (last 30 days) and 12 files submitted
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Darin Koblick

E-mail
Company/University
California State University
Lat/Long
33.80780029296875, -118.3697967529297

Personal Profile:
Professional Interests:
Aerospace Engineering Sciences

 

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Files Posted by Darin View all
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07 Sep 2011 Convert UTC to Solar Apparent Time Convert a time given in UTC to Solar Apparent or Solar Mean Time Author: Darin Koblick solar mean time, solar apparent time, utc, equation of time, gmt, lat 7 0
06 Sep 2011 Screenshot Equation of Time Compute the equation of time with accuracy on the order of seconds. Author: Darin Koblick equation of time, astronomy, solar, sun, utc, gmt 9 0
20 Feb 2011 Screenshot Bulirsch-Stoer Propagator/Integrator Implementation of the Bulirsch-Stoer algorithm for purposes of numerical orbit propagation. Author: Darin Koblick bulirschstoer, propagation, ode, richardson extrapolat..., modified midpoint met..., propagator 15 0
18 Aug 2010 Screenshot Lunar Azimuth and Altitude Estimation Algorithm Predict the Lunar Azimuth and Altitude within +/- .2 deg of any lat and lon for a given UTC Author: Darin Koblick azimuth, gmt, moon, lunar, aerospace, elevation 13 2
  • 4.0
4.0 | 2 ratings
19 Jul 2010 Convert Julian Date to Greenwich Apparent Sidereal Time Find the Greenwich Apparent Sidereal Time Given any Julian Date Author: Darin Koblick gmst, gast, greenwich, sidereal, time, jd 9 0
Comments and Ratings by Darin View all
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09 Jan 2012 Convert ECI to ECEF Coordinates Transform ECI position and velocity vectors to ECEF position and velocity vectors. Author: Darin Koblick

Syed,

Send me your test case and I will take a look at it.

Thanks,
-Darin
28 Oct 2010 Convert ECI to ECEF Coordinates Transform ECI position and velocity vectors to ECEF position and velocity vectors. Author: Darin Koblick

Ismail,

You are more than likely using the wrong dimensions for r_ECI.
This is specified in my input requirements as [3 x N].

Try:
r_ECI = [10.7148713368681e+003; ...
 -7.10368453661470e+003; ...
 -22.0702973475812e+003]

In other words, transpose the r_ECI input for the correct answer.
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10 Jan 2012 Convert ECI to ECEF Coordinates Transform ECI position and velocity vectors to ECEF position and velocity vectors. Author: Darin Koblick Ali, Syed Zohaib

Hi Darin

Now its working fine. I was passing JD argument in a wrong way.

Thanks
Zohaib
09 Jan 2012 Convert ECI to ECEF Coordinates Transform ECI position and velocity vectors to ECEF position and velocity vectors. Author: Darin Koblick Koblick, Darin

Syed,

Send me your test case and I will take a look at it.

Thanks,
-Darin
09 Jan 2012 Convert ECI to ECEF Coordinates Transform ECI position and velocity vectors to ECEF position and velocity vectors. Author: Darin Koblick Ali, Syed Zohaib

Hi

I am facing problem in converting 1441 values of position and velocity vectors from ECI to ECEF. It seems that function works fine. When 93 out of 1441 values were passed to the function it gave values for x,y & z components which I thought are correct but when 186 out of 1441 values were passed to the function, the initial 93 x & y values were different from the one that I got by passing only 93 values, z components were the same. similarly when more values were passed the x&y were different except the z-component.
can you please guide what could be the problem?

26 Nov 2011 Convert ECI to ECEF Coordinates Transform ECI position and velocity vectors to ECEF position and velocity vectors. Author: Darin Koblick yue, lin
17 Oct 2011 Convert Azimuth and Elevation to Right Ascension and Declination Algorithm will convert Az/El angles to RA /DEC using a topocentric coordinate frame Author: Darin Koblick Crazy, Artik

Nice code, thank you :)
Probably it is better to output Right Ascension in hours and not in degrees.
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gmt, aerospace, az, azimuth, el
Files Tagged by Darin View all
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
07 Sep 2011 Convert UTC to Solar Apparent Time Convert a time given in UTC to Solar Apparent or Solar Mean Time Author: Darin Koblick solar mean time, solar apparent time, utc, equation of time, gmt, lat 7 0
06 Sep 2011 Screenshot Equation of Time Compute the equation of time with accuracy on the order of seconds. Author: Darin Koblick equation of time, astronomy, solar, sun, utc, gmt 9 0
20 Feb 2011 Screenshot Bulirsch-Stoer Propagator/Integrator Implementation of the Bulirsch-Stoer algorithm for purposes of numerical orbit propagation. Author: Darin Koblick bulirschstoer, propagation, ode, richardson extrapolat..., modified midpoint met..., propagator 15 0
18 Aug 2010 Screenshot Lunar Azimuth and Altitude Estimation Algorithm Predict the Lunar Azimuth and Altitude within +/- .2 deg of any lat and lon for a given UTC Author: Darin Koblick azimuth, gmt, moon, lunar, aerospace, elevation 13 2
  • 4.0
4.0 | 2 ratings
19 Jul 2010 Convert Julian Date to Greenwich Apparent Sidereal Time Find the Greenwich Apparent Sidereal Time Given any Julian Date Author: Darin Koblick gmst, gast, greenwich, sidereal, time, jd 9 0

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