Patent AU-2014218372-B2 (AU)
Title: A signal processing technique for a metal detector
Inventor: WAHRLICH PHILIP SHANE
IPC: G01V3/38
Filed: 2014-04-24
Granted: 2015-02-19
Abstract: (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date W O 2014/172751 Al 30 October 2014 (30.10.2014) W I P0 I P CT (51) International Patent Classification: AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, G01V3/11 (2006.01) GO1R 33/00 (2006.01) BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, G01V3/38 (2006.01) DO, DZ, EC, EE, EG, ES, Fl, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, (21) International Application Number: KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, PCT/AU2014/000466 MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, (22) International Filing Date: OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, 24 April 2014 (24.04.2014) SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, (25) Filing Language: English Zw. (26) Publication Language: English (84) Designated States (unless otherwise indicated, for every (30) Priority Data: kind of regional protection available): ARIPO (BW, GH, 2013901459 26 April 2013 (26.04.2013) AU GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, (71) Applicant: MINELAB ELECTRONICS PTY LIM- TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, ITED [AU/AU]; 118 Hayward Avenue, Torrensville, EE, ES, Fl, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, South Australia 5031 (AU). MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, (72) Inventor: WAHRLICH, Philip Shane; 118 Hayward Av- TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, enue, Torrensville, South Australia 5031 (AU). (74) Agent: MADDERNS; GPO Box 2752, Adelaide, South Published: Australia 5001 (AU). - with international search report (Art. 21(3)) (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, (54) Title: A SIGNAL PROCESSING TECHNIQUE FOR A METAL DETECTOR (57) Abstract: A method for detecting a target in --23 a soil using a metal detector, including: generat ing a transmit magnetic field for transmission into providing a receive signal induced by the soil based on a transmit signal; receiving a re <-25 induced by the receive magnetic field; determin determining, based on the receive signal, ing, based on the receive signal, a model of at a model of at least two independent components of -21 least two independent components of the receive the receive signal which are due to signals signal which are due to signals from the soil; pro from the soil cessing the receive signal to produce a set of data which is with effects of the signals from the soil -- 27 reduced therein or removed therefrom by fitting processing the receive signal to produce a set of the model to the receive signal, then subtracting data which is with effects of the signals from the the fined model from the receive signal; and pro wil reduced therein or removed therefrom by fittog ducing, based on the set of data, an indicator outthe model to the receive signal, then subtracting the fitted model from the receive signal put signal for indicating a presence and/or identity of the target. producing, based on the set of data an indicator output signal for indicating a presence and/or identity of the target Figure 2