{"product_id":"channel-characterisation-and-system-design-for-sub-surface-communications","title":"Channel Characterisation and System Design for Sub-Surface Communications","description":"\u003cp\u003eBased on the author's PhD thesis, this book is a theoretical study of subterranean radio communication, with the focus on methods that depend primarily on the penetration of electromagnetic fields through the ground. Through-the-earth communication using e-m fields - specifically magnetic induction - plays a role in search and rescue systems used in the mining industry. It is also used for borehole telemetry, pipeline location and by cavers and pot-holers. Chapters describe propagation, antennas, and the design of transmitters and receivers. A figure of merit - the specific aperture - is introduced as an aid to antenna design. A crucial aspect of all systems is the signal to noise ratio, for which the strategy of noise-matching is introduced. The design of a wide-band low-frequency sounder is described, for channel evaluation using a non-ideal binary sequence. A method of calculating the inverse of a generalised sequence is described, for which cross-correlation results in a system identification signal.\u003c\/p\u003e","brand":"David Gibson","offers":[{"title":"Paperback","offer_id":44274658967713,"sku":"9781445769530","price":88.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0462\/1120\/3233\/files\/1w4qvp9y-front-shortedge-384_3a76ead3-283d-45df-9d7f-98ae0f5eab8f.jpg?v=1748300038","url":"https:\/\/bookswholesale.myshopify.com\/products\/channel-characterisation-and-system-design-for-sub-surface-communications","provider":"BooksWholesale","version":"1.0","type":"link"}