How to model Bias Instability Drift in Simulink?

I would like to ask about modelling the Bias Instability drift in Simulink. I know that there is a block called colored noise, but I cant specify the caradcteristics of the bias that I want to model. In the Navigation toolbox reference (page 404) they say that it is modeled as white noise biased and then filtered.

It would be really nice if someone could help me understand the concept of this model.

Answer 1

[Vinayak]

Hi,

Although there exists no direct way to add a bias onto the coloured noise block, this can still be achieved.

1. Generate Colored Noise: Use the "Colored Noise" block to generate a colored noise signal with the desired PSD profile. Configure the block's parameters to match your requirements.
2. Add Bias: After generating the colored noise signal, use a "Sum" block to add a constant bias value to the signal. The bias value represents the desired bias component of the Bias Instability drift. You can use a "Constant" block to achieve this.
3. Filter the Signal: Apply a filter to shape the spectral characteristics of the biased colored noise signal. The specific filter design depends on the desired characteristics of the Bias Instability drift. You can use Simulink blocks like "Transfer Fcn" or "Filter" to implement the desired filter.

Using this, you can create a simulink model that generates colored noise with a bias component.