EP0120520A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System for locating a sound source in a water area
Assignee: Koninklijke Philips NV
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Filing: 1984-02-22
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Granted: —
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Expires: 2004-02-22
Abstract
Abstract According to the system for monitoring a water area with regards to presence and localization of unknown objects, which transmit sound, in particular submarines three or more listening devices (A1, A2, A3) are thrown out in an area, where indication about an unknown object has been obtained. The listening devices are provided with hydrophones and radio transmitters for transmission of received sound by modulation on a carrier. The devices cooperate with stationary radio stations (M1, M2, M3), where the sound waves are demodulated. Time correlation between the sound waves from an object received by three selected listening devices gives information about the position of the object relative to these selected listening devices. If the position of the listening devices is unknown, for example if the devices are floating free, this position can be determined by comparing the mutual time position for a particular radio signal transmitted from each listening device when received in three stationary radio stations with known positions. The listening devices may suitably also be provided with receivers for receiving radio control signals, for example relating to order for activation, selection of radio channel, etc.
Inventors
- 👤 Bengt Gunnar Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:55
CPC Classifications
G; G01; G01S; G01S5/00; G01S5/0009; G01S5/18; G01S5/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
221 words
A method for locating a sound source in a water area by means of hydrophone listening, wherein at least three listening devices are provided each comprising a hydrophone and a radio transmitter with associated antenna and wherein there is further provided one radio master station to which signals indicative of sounds detected by the listening devices are transmitted and which station determines the geographical position of the sound source by correlating the said signals, characterized in that there are provided at least two relay stations at geographically known positions, the method comprising the steps of: - the listening devices transmitting, alternatively, signals indicative of the identity of the listening device and of the detected sound of the sound source, said signals being received by the master station and the relay stations; - the relay stations relaying the said received signals to the master station; - the master station processing the part of the said received signals indicative of the identity of the listening devices to establish the geographical position of said listening devices; - the master station determining the geographical position of the sound source with respect to the - in the previous step determined - geographical positions of the said listening devices by correlating the part of the said received signals indicative of the detected sound of the sound source.
Claim 2
Independent Claim
221 words
A method for locating a sound source in a water area by means of hydrophone listening, wherein at least three listening devices are provided each comprising a hydrophone and a radio transmitter with associated antenna and wherein there is further provided one radio master station to which signals indicative of sounds detected by the listening devices are transmitted and which station determines the geographical position of the sound source by correlating the said signals, characterized in that there are provided at least two relay stations at geographically known positions, the method comprising the steps of: - the listening devices transmitting, alternatively, signals indicative of the identity of the listening device and of the detected sound of the sound source, said signals being received by the master station and the relay stations; - the relay stations relaying the said received signals to the master station; - the master station processing the part of the said received signals indicative of the identity of the listening devices to establish the geographical position of said listening devices; - the master station determining the geographical position of the sound source with respect to the - in the previous step determined - geographical positions of the said listening devices by correlating the part of the said received signals indicative of the detected sound of the sound source.
Claim 3
Dependent Claim
57 words
A method for locating a sound source as claimed in Claim 1, characterized in that the listening devices each comprise a radio receiver that the radio station transmits control information to the listening devices, said control information, upon reception by the listening device, being indicative of the selective acti- yation of the transmitter of that listening device.
Claim 4
Dependent Claim
163 words
J. A system for locating a sound source in a water area by means of hydrophone listening comprising a plurality of at least three listening devices each provided with a hydrophone and a radio transmitter with associated antenna, the system further comprising a radio master station provided with correlator means for determining the position of a sound source by correlating the signals received from the listening devices characterized in that the system comprises at least two relay stations at geographically known positions for relaying the signals received from the listening devices to the master station, that the listening devices comprise switching means for alternatively applying to the transmitter a signal indicative of the identify of the listening device and a signal indicative of the detected sound of the sound source and the master station comprising processing means responsive to the part of the received signal of indicative of the identify of the listening devices to establish the geographical position of said listening devices.
Claim 5
Dependent Claim
163 words
J. A system for locating a sound source in a water area by means of hydrophone listening comprising a plurality of at least three listening devices each provided with a hydrophone and a radio transmitter with associated antenna, the system further comprising a radio master station provided with correlator means for determining the position of a sound source by correlating the signals received from the listening devices characterized in that the system comprises at least two relay stations at geographically known positions for relaying the signals received from the listening devices to the master station, that the listening devices comprise switching means for alternatively applying to the transmitter a signal indicative of the identify of the listening device and a signal indicative of the detected sound of the sound source and the master station comprising processing means responsive to the part of the received signal of indicative of the identify of the listening devices to establish the geographical position of said listening devices.
Claim 6
Dependent Claim
74 words
A system for locating a sound source in a water area by means of hydrophone listening as claimed in Claim 3, characterized in that the listening devices each comprise a radio receiver, that the master station comprises transmitting means for the transmission of control information to the listening devices and that the listening devices each comprise activation control means for controlling the selective activation of the listening device in accordance with the control information.
References Cited (Backward Citations)
DE977404C
Cited
US3183478A
Cited
US3546666A
Cited
US3723960A
Cited
DE2137074A1
Cited
US4070671A
Cited
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