A Radiometer Employing Frequency-Domain Coding


  • G. J. M. Aitken,

  • R. J. Mills


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.