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Passive Acoustic Range Estimation of Helicopters

A passive acoustic method is presented that determines the velocity of a moving helicopter and its range at the closest point of approach. This method requires only the use of a single microphone if the fundamental blade rotation frequency of the helicopter is known, or two spatially separated micro...

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Main Authors:	Olson, Reo, Cress, Daniel H
Format:	Report
Language:	English
Subjects:	Acoustic Detection and Detectors ACOUSTIC DETECTORS ACOUSTIC TRACKING Aerodynamics AIRSPEED DOPPLER SYSTEMS Helicopters HIGH RESOLUTION FREQUENCY ESTIMATION MU-001 PASSIVE SYSTEMS PE62719A POSITION FINDING RANGE ESTIMATION RANGE FINDING RANGE(DISTANCE) SINGLE ACOUSTIC DETECTORS Target Direction, Range and Position Finding TEMPORAL COHERENCE VELOCITY ESTIMATION
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creator	Olson, Reo Cress, Daniel H
description	A passive acoustic method is presented that determines the velocity of a moving helicopter and its range at the closest point of approach. This method requires only the use of a single microphone if the fundamental blade rotation frequency of the helicopter is known, or two spatially separated microphones if it is not. The blade rotation frequency is generally adequately known after the helicopter is correctly classified using acoustic signature characteristics other than those discussed herein. The range estimate is considered valid for ranges of a few hundred meters with the attendant assumptions that: (1) the helicopter is traveling in a straight line, (2) the helicopter is moving at a constant velocity, and (3) the main rotor of the helicopter has a stable revolution rate typical of present operational helicopters. The technique was successfully tested on an example helicopter.
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This method requires only the use of a single microphone if the fundamental blade rotation frequency of the helicopter is known, or two spatially separated microphones if it is not. The blade rotation frequency is generally adequately known after the helicopter is correctly classified using acoustic signature characteristics other than those discussed herein. The range estimate is considered valid for ranges of a few hundred meters with the attendant assumptions that: (1) the helicopter is traveling in a straight line, (2) the helicopter is moving at a constant velocity, and (3) the main rotor of the helicopter has a stable revolution rate typical of present operational helicopters. The technique was successfully tested on an example helicopter.</description><language>eng</language><subject>Acoustic Detection and Detectors ; ACOUSTIC DETECTORS ; ACOUSTIC TRACKING ; Aerodynamics ; AIRSPEED ; DOPPLER SYSTEMS ; Helicopters ; HIGH RESOLUTION FREQUENCY ESTIMATION ; MU-001 ; PASSIVE SYSTEMS ; PE62719A ; POSITION FINDING ; RANGE ESTIMATION ; RANGE FINDING ; RANGE(DISTANCE) ; SINGLE ACOUSTIC DETECTORS ; Target Direction, Range and Position Finding ; TEMPORAL COHERENCE ; VELOCITY ESTIMATION</subject><creationdate>1992</creationdate><rights>Approved for public release; distribution is unlimited.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,776,881,27544,27545</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/ADA248033$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Olson, Reo</creatorcontrib><creatorcontrib>Cress, Daniel H</creatorcontrib><creatorcontrib>ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB</creatorcontrib><title>Passive Acoustic Range Estimation of Helicopters</title><description>A passive acoustic method is presented that determines the velocity of a moving helicopter and its range at the closest point of approach. This method requires only the use of a single microphone if the fundamental blade rotation frequency of the helicopter is known, or two spatially separated microphones if it is not. The blade rotation frequency is generally adequately known after the helicopter is correctly classified using acoustic signature characteristics other than those discussed herein. The range estimate is considered valid for ranges of a few hundred meters with the attendant assumptions that: (1) the helicopter is traveling in a straight line, (2) the helicopter is moving at a constant velocity, and (3) the main rotor of the helicopter has a stable revolution rate typical of present operational helicopters. The technique was successfully tested on an example helicopter.</description><subject>Acoustic Detection and Detectors</subject><subject>ACOUSTIC DETECTORS</subject><subject>ACOUSTIC TRACKING</subject><subject>Aerodynamics</subject><subject>AIRSPEED</subject><subject>DOPPLER SYSTEMS</subject><subject>Helicopters</subject><subject>HIGH RESOLUTION FREQUENCY ESTIMATION</subject><subject>MU-001</subject><subject>PASSIVE SYSTEMS</subject><subject>PE62719A</subject><subject>POSITION FINDING</subject><subject>RANGE ESTIMATION</subject><subject>RANGE FINDING</subject><subject>RANGE(DISTANCE)</subject><subject>SINGLE ACOUSTIC DETECTORS</subject><subject>Target Direction, Range and Position Finding</subject><subject>TEMPORAL COHERENCE</subject><subject>VELOCITY ESTIMATION</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>1992</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNrjZDAISCwuzixLVXBMzi8tLslMVghKzEtPVXAFsnMTSzLz8xTy0xQ8UnMyk_MLSlKLinkYWNMSc4pTeaE0N4OMm2uIs4duClBzPFBXXmpJvKOLo5GJhYGxsTEBaQCllihS</recordid><startdate>199202</startdate><enddate>199202</enddate><creator>Olson, Reo</creator><creator>Cress, Daniel H</creator><scope>1RU</scope><scope>BHM</scope></search><sort><creationdate>199202</creationdate><title>Passive Acoustic Range Estimation of Helicopters</title><author>Olson, Reo ; Cress, Daniel H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-dtic_stinet_ADA2480333</frbrgroupid><rsrctype>reports</rsrctype><prefilter>reports</prefilter><language>eng</language><creationdate>1992</creationdate><topic>Acoustic Detection and Detectors</topic><topic>ACOUSTIC DETECTORS</topic><topic>ACOUSTIC TRACKING</topic><topic>Aerodynamics</topic><topic>AIRSPEED</topic><topic>DOPPLER SYSTEMS</topic><topic>Helicopters</topic><topic>HIGH RESOLUTION FREQUENCY ESTIMATION</topic><topic>MU-001</topic><topic>PASSIVE SYSTEMS</topic><topic>PE62719A</topic><topic>POSITION FINDING</topic><topic>RANGE ESTIMATION</topic><topic>RANGE FINDING</topic><topic>RANGE(DISTANCE)</topic><topic>SINGLE ACOUSTIC DETECTORS</topic><topic>Target Direction, Range and Position Finding</topic><topic>TEMPORAL COHERENCE</topic><topic>VELOCITY ESTIMATION</topic><toplevel>online_resources</toplevel><creatorcontrib>Olson, Reo</creatorcontrib><creatorcontrib>Cress, Daniel H</creatorcontrib><creatorcontrib>ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Olson, Reo</au><au>Cress, Daniel H</au><aucorp>ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>Passive Acoustic Range Estimation of Helicopters</btitle><date>1992-02</date><risdate>1992</risdate><abstract>A passive acoustic method is presented that determines the velocity of a moving helicopter and its range at the closest point of approach. This method requires only the use of a single microphone if the fundamental blade rotation frequency of the helicopter is known, or two spatially separated microphones if it is not. The blade rotation frequency is generally adequately known after the helicopter is correctly classified using acoustic signature characteristics other than those discussed herein. The range estimate is considered valid for ranges of a few hundred meters with the attendant assumptions that: (1) the helicopter is traveling in a straight line, (2) the helicopter is moving at a constant velocity, and (3) the main rotor of the helicopter has a stable revolution rate typical of present operational helicopters. The technique was successfully tested on an example helicopter.</abstract><oa>free_for_read</oa></addata></record>
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language	eng
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source	DTIC Technical Reports
subjects	Acoustic Detection and Detectors ACOUSTIC DETECTORS ACOUSTIC TRACKING Aerodynamics AIRSPEED DOPPLER SYSTEMS Helicopters HIGH RESOLUTION FREQUENCY ESTIMATION MU-001 PASSIVE SYSTEMS PE62719A POSITION FINDING RANGE ESTIMATION RANGE FINDING RANGE(DISTANCE) SINGLE ACOUSTIC DETECTORS Target Direction, Range and Position Finding TEMPORAL COHERENCE VELOCITY ESTIMATION
title	Passive Acoustic Range Estimation of Helicopters
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