  We present simulations for interferometer arrays in Earth orbit and on the
lunar surface to guide the design and optimization of space-based Ultra-Long
Wavelength missions, such as those of China's Chang'E program. We choose
parameters and present simulations using simulated data to identify
inter-dependencies and constraints on science and engineering parameters. A
regolith model is created for the lunar surface array simulation, the results
show that the lunar regolith will have an undesirable effect on the
observation. We estimate data transmission requirement, calculate sensitivities
for both cases, and discuss the trade-off between brightness temperature
sensitivity and angular resolution for the Earth orbit array case.
