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This paper presents the receiver architecture used in frequency modulated continuous wave (FMCW) RADAR for space debris observation. It has been designed to operate in the 2 to 6 GHz C band and has an intermediate frequency stage in which the automatic gain controller is implemented. The design mitigates the effect of the self-interference by filtering it in analogue base-band stage. The receiver has an automatic 80 dB dynamic range for the gain, a noise figure of 1.5 dB, a sensitivity level dictated by the self-interference signal at −148 dBm/Hz and a total gain of up to 115 dB. It must be mentioned that the design incorporates only commercial off-the-shelf components (COTS).