A radiometer has been developed in which the spectrum of the noise‐like signal is shaped (spectral coding) so that it can be distinguished from the receiver noise by a simple correlation process. This radiometer has a small‐signal sensitivity comparable to that of the Dicke (temporally coded) system and an output insensitive to variations in the system gain or front‐end temperature. An advantage of the system is the simplicity of the required hardware, leading to the possibility of high reliability. A practical radiometer was constructed to demonstrate the technique.
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