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We have observed an area of ≈27 deg 2  to an rms noise level of 0.2 mJy at 15.7 GHz, using the Arcminute Microkelvin Imager Large Array. These observations constitute the most sensitive radio‐source survey of any extent (≳0.2 deg 2 ) above 1.4 GHz. This paper presents the techniques employed for observing, mapping and source extraction. We have used a systematic procedure for extracting information and producing source catalogues, from maps with varying noise and  u  v ‐coverage. We have performed simulations to test our mapping and source‐extraction procedures, and developed methods for identifying extended, overlapping and spurious sources in noisy images. In an accompanying paper, AMI Consortium: Davies et al., the first results from the 10C survey, including the deep 15.7‐GHz source count, are presented.

10C survey of radio sources at 15.7 GHz – I. Observing, mapping and source extraction ★