# Process noise of satellite orbit determination

• whigg_wang
In summary, the conversation discusses a difficulty in calculating the transition matrix for space vehicle orbit determination. The speaker is seeking guidance on how to calculate partial derivatives of process noise in relation to position and velocity parameters. They also mention using the atmospheric drag model and air drag acceleration as process noise. The conversation ends with a request for a helpful answer and a decision to lock the thread.
whigg_wang
During my work of space vehicle orbit determination, I have been confronted with a difficulty that hasn't been solved until now. When calculating the transition matrix that translate the process noises to the state parameters of position and velocity,how can I work out the partial derivatives of the process noise with respect to the position and the velocity parameters?May I take the atmospheric drag model as the process noise explicit expression,if I take air drag acceleration as a process noise? WAITING for your helpful answer.

I'm going to lock this thread.

## 1. What is process noise of satellite orbit determination?

Process noise refers to the random or unpredictable variations in the satellite's orbit due to external factors such as atmospheric drag, solar radiation pressure, and gravitational perturbations from other celestial bodies. It is a major source of error in orbit determination and must be accounted for in order to accurately predict the satellite's position and velocity.

## 2. How does process noise affect satellite orbit determination?

Process noise can cause deviations from the predicted orbit, leading to errors in tracking and communication with the satellite. This can also impact the accuracy of future predictions and can make it difficult to maintain the desired orbit for the satellite.

## 3. How is process noise measured and accounted for in orbit determination?

Process noise is typically quantified through mathematical models that take into account various external factors affecting the satellite's orbit. These models are then incorporated into the orbit determination process to minimize the impact of process noise on the final results.

## 4. Can process noise be reduced or eliminated?

While it is not possible to completely eliminate process noise, it can be reduced by continuously monitoring and updating the satellite's orbit parameters and by using more accurate and sophisticated mathematical models. Additionally, regular orbit maintenance maneuvers can help counteract the effects of process noise.

## 5. How does process noise impact satellite mission planning and operations?

Process noise can significantly impact the success of a satellite mission by affecting its orbit accuracy and stability. This can lead to difficulties in communication, data collection, and other important operations. Therefore, it is crucial for scientists and engineers to carefully consider and account for process noise in all aspects of satellite mission planning and operations.

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