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The objective of this sources sought is to locate vendors who can, in real time, simulate and generate high fidelity GNSS signals at RF as received by a platform with arbitrary trajectory. This is dif... The objective of this sources sought is to locate vendors who can, in real time, simulate and generate high fidelity GNSS signals at RF as received by a platform with arbitrary trajectory. This is difficult to do correctly: for a single constellation there are N satellites in orbit each with their own doppler and range. A simulator must generate the appropriate data packets given ephemeris data, modulate it with the correct GNSS modulation scheme, apply doppler and relative time offsets, apply propagation effects from space -> ground, apply platform effects like doppler. The GNSS must be able to support multiple channels simultaneously regarding Interference/Spoof/Jam Hardware + Software Simulator.