Zheng-shi Yu

10 Questions 34 Answers 0 Followers

Questions related from Zheng-shi Yu

What is the relationship between Moving Horizon Estimation (MHE) and EKF?

Now I want to solve a navigation problem using both MHE and EKF. I found that MHE has a better performance than EKF for highly nonlinear system. Can anyone tell me the reason? What is the...

07 November 2014 8,793 3 View

How does the plasma sheath affect the propagation of radio waves?

When a reentry vehicle moves fast in the atmosphere, the atmosphere around the vehicle will be ionized due to aerodynamic heat. Sometimes communication blackout may happen. I would like know how...

28 April 2014 1,478 6 View

Which is better: batch-based estimation or the filter algorithm?

I am investigating orbit determination for planetary exploration. I would like to try different kinds of estimation methods such as batch-based estimation and EKF. Up till now, I have found that...

10 April 2014 1,214 9 View

How to understand quantum entanglement?

I have just learned about quantum communication. However, it seems a little difficult to understand the state of quantum entanglement. How can we know one quantum's state as soon as the other's...

01 April 2014 8,477 55 View

Could anybody tell me the atmospheric entry conditions of the Mars Science Laboratory?

Hello everybody, I am trying to simulate the Entry, Descent and Landing phase of the Mars Science Laboratory. However, I can hardly find credible information about the state of the MSL at entry...

24 March 2014 8,824 9 View

Could anybody can give some advice on what kinds of filters are more practical for system with unknown model or measurements errors?

As far as I know, the filter algorithm can be separated into two parts: prediction and update. How to optimally estimate the state relies on balancing the weight of prediction and update. On the...

18 March 2014 7,287 9 View

Can anybody give me some advice about filtering divergence in the Mars approaching phase?

When I try to analyze the navigation for Mars approaching phase (entry 24h to entry), I find a significant divergence of rv in the last half hour. I used the X-ray pulsar measurements as...

14 March 2014 1,651 0 View

Could anybody give me some information on the magnetic field on Mars?

As far as I know, Mars has no inner dynamo to create a major global magnetic field. However, crustal magnetic fields exist on Mars. I would like to know how the property of this field changes with...

12 March 2014 3,567 7 View

Are there any other natural bodies in the universe that can emit stable signals like pulsars?

As far as I know, pulsar-based navigation has been intensively investigated. I wonder are there any other natural bodies in the universe that can emit stable signals like pulsars?

06 March 2014 1,311 8 View

Can anyone help with divergence of orbital elements in atmospheric entry?

I want to describe the dynamics of atmospheric entry by means of orbit elements. However, because of the drag of atmosphere, the orbit of spacecraft changes from hyperbola to ellipse. Therefore,...

28 February 2014 3,271 4 View