### Learning Creo Parametric (New CAD tools!)

Learning a new software for CAD/modeling. Posted the finished product. … More Learning Creo Parametric (New CAD tools!)

### Spring 2019/Lecture 12/Real Measurements 2 – 22 Feb 2019

Two way ranging and Doppler systems are summarized. Differenced measurements or “differencing,” is explained. For additional explanation on differencing see Penn State’s course for Geospatial and GNSS professionals (https://www.e-education.psu.edu/geog862/node/1727).

### Spring 2019/Homework 2 Solution

Demonstrate understanding of orbital mechanics necessary to complete orbit determination course. In problem 1, position and velocity are converted between osculating elements and sub-satellite points. In problem 2, the receiver measurements confirm the node location varies over time. In problem 3 the equations of motion are numerically integrated for a GLONASS satellite for one day. … More Spring 2019/Homework 2 Solution

### Spring 2019/Technical Difficulties

I’m having some technical difficulties with recording the lecture. I’ll re-record all three and post them for you later. For now, enjoy lecture 5. Also, you should have finished your homework and turned it in. Solutions will be posted soon.

### Spring 2019/Lecture 4/Two Body Problem – 30 Jan 2019

Sprinting through orbital mechanics. We covered the two-body problem. We will resume with perturbations and additional bodies considered in the system. … More Spring 2019/Lecture 4/Two Body Problem – 30 Jan 2019

I attended the 2018 International Geoscience And Remote Sensing Symposium (IGARSS 2018) in July; presenting on the recently proposed 50 CubeSat constellation to sound the Antarctic ice sheets. … More IGARSS 2018: CubeSat Constellation

### Lecture 3 – Orbital Mechanics Review B

I pick up again by reviewing the solution to the problem assigned during Lecture 1. A few common coordinate systems and reference frames are introduced, orbital perturbations are introduced, and an example problem to be solved in Lecture 4 is given to the class to start on. … More Lecture 3 – Orbital Mechanics Review B

### OD – HW 1 Solution

Solving for the state vector in a uniform gravitational field with “true,” range observations. … More OD – HW 1 Solution

### OD – Postponement/Ans.

I’ve been traveling and haven’t been able to finish the last part of Orbital Mechanics Review. Feel free to review Dr. Russell’s work, prior to Monday. Full solution will be posted Monday as well. If you’re answers don’t match up; start a discussion in the comments below. Answer for the practice problem: X0 1 Y0 … More OD – Postponement/Ans.

### Lecture 2 – Orbital Mechanics Review A

Lecture 2 – Orbital Mechanics Review A has been uploaded. A review of orbital mechanics was necessary. … More Lecture 2 – Orbital Mechanics Review A

### Lecture 1 – Orbit Determination Concepts

The Orbit Determination (OD) problem is introduced in the context of a simple dynamic problem. We throw a satellite up and watch it come down while introducing some important concepts. … More Lecture 1 – Orbit Determination Concepts

### Statistical Orbit Determination

I will be teaching a statistical orbit determination course via YouTube over the summer of 2018. … More Statistical Orbit Determination

### Space Operations and Support Technical Committee

Today I received official notice: I am a member of the AIAA Space Operations and Support Technical Committee (SOSTC). The SOSTC Charter: “The Space Operations and Support Technical Committee (SOSTC) is concerned with all aspects of civil, military, and commercial space operations and support, including direct and supporting operations, the systems and software affecting operations, … More Space Operations and Support Technical Committee

### FreeFlyer Demonstration: 2:00pm Sep. 28, 2017 for UA faculty and students

I will be giving a demonstration of FreeFlyer on Thursday, September 28 at 2:00 pm in SERC 3070. Faculty and Students feel free to drop on by! I have attached the flyer, here: FreeFlyerWithAttitude Christopher Simpson will present a FreeFlyer demonstration, “FreeFlyer with Attitude,” on Thursday, September 28, 2017 at 2:00 pm in SERC 3070. … More FreeFlyer Demonstration: 2:00pm Sep. 28, 2017 for UA faculty and students

### 2017 ESPRMC Graduate Research Symposium – The University of Alabama

I will be presenting “Benefits of Tracking Aids on a 1U CubeSat,” on Thursday, April 13 at the 2017 ESPRMC Graduate Research Symposium. Dr. O’Neill was my co-author. I hope to see you there. … More 2017 ESPRMC Graduate Research Symposium – The University of Alabama

### Spring 2019/Lecture 11/Conceptual Example – 20 Feb 2019

The environment and relativity effects on radio and optical communications are introduced. One-way range measurement systems are introduced. GPS is provided as an example but it still applies to GLONASS and Galileo. Two-way range, Doppler, and differenced measurements are considered next.