BURIED PIPE SEARCHING SYSTEM

PROBLEM TO BE SOLVED: To search a beacon surely by determining whether the beacon is present or not based on the correlation between the receiving signal of response wave from the beacon and a spread spectrum signal. SOLUTION: A burst generator 13 outputs a burst signal C based on a source oscillati...

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Bibliographische Detailangaben
1. Verfasser:	MASAKADO AKIROU
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING DETECTING MASSES OR OBJECTS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GEOPHYSICS GRAVITATIONAL MEASUREMENTS HEATING JOINTS OR FITTINGS FOR PIPES LIGHTING MEANS FOR THERMAL INSULATION IN GENERAL MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS MECHANICAL ENGINEERING PHYSICS PIPES SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING TESTING THERMAL INSULATION IN GENERAL TRANSMISSION WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To search a beacon surely by determining whether the beacon is present or not based on the correlation between the receiving signal of response wave from the beacon and a spread spectrum signal. SOLUTION: A burst generator 13 outputs a burst signal C based on a source oscillation signal (a) and a signal (b) for burst. It is then subjected to spread spectrum modulation 15 using a spread signal being generated 14 and transmitted, as an interrogation wave, from an antenna 16 toward the ground surface. In resonance to the interrogation wave, an antenna 21 and a capacitor 22 in the beacon 2 generate a receiving signal and a response wave is transmitted from a coil 21 using the electromagnetic energy of a discrete resonator 23. The antenna 16 transmits the receiving signal of response wave to a spread spectrum demodulator 17 where the correlation value between the receiving signal and spread signal is determined. A processor/indicator 18 makes a decision that the beacon 2 is present nearby if the correlation value is higher than a preset level and indicates to this effect. Since spread a spectrum interrogation wave and a response wave are used, effect of external noise can be reduced.