fftvis: A Non-Uniform Fast Fourier Transform-based Visibility Simulator

fftvis is a fast Python package designed for simulating interferometric visibilities using the Non-Uniform Fast Fourier Transform (NUFFT). It provides a convenient and efficient way to generate simulated visibilities.

Features

• Utilizes the Flatiron Institute NUFFT (finufft) algorithm for fast visibility simulations that agree with similar methods (matvis) to high precision.
• Designed to be a near drop-in replacement to matvis with a ~10x improvement in runtime

Limitations

• Currently no support for per-antenna beams
• Currently no support for polarized sky emission
• Currently no GPU support
• Diffuse sky models must be pixelized

Installation

You can install fftvis via pip:

pip install fftvis

Contributing

Contributions to fftvis are welcome! If you find any issues, have feature requests, or want to contribute improvements, please open an issue or submit a pull request on the GitHub repository: fftvis on GitHub

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

This package relies on the finufft implementation provided by finufft library. Special thanks to the contributors and maintainers of open-source libraries used in this project.