Underwater communication system
阅读：49发布：2023-08-11
专利汇可以提供Underwater communication system专利检索，专利查询，专利分析的服务。并且An underwater communication system wherein communication is achieved through an alternating electric field between spacedapart pairs of transmitting and receiving electrodes in conductive contact with the water. The transmitting and receiving electrodes are horizontally oriented and two pairs of orthogonally disposed receiving electrodes can be used to provide omnidirectional communication. The receiver is responsive only to properly coded signals. According to one embodiment the receiver responds only to signals of a selected frequency and duration, and is not effected by short bursts of noise or the cumulative effect of short signals. According to other embodiments various different coding and redundancy techniques are employed.，下面是Underwater communication system专利的具体信息内容。
1. An underwater communication system comprising a pair of spaced-apart transmitting electrodes in conductive relationship with the water; a code selector for providing a continuous predetermined electrical signal of a preselected frequency; a low frequency transmitter including said code selector and connected to said transmitting electrodes to establish an alternating electric field surrounding said transmitting electrode in accordance with said electrical signal; a pair of spaced-apart receiving electrodes in conductive relationship with the water and adapted to be disposed within said alternating electric field to receive said predetermined electrical signal; and a receiver connected to said receiving electrodes and including a tuned receiver input channel tuned to said preselected frequency, and an electronic switch operatively coupled to said input channel to become activated in response to incoming signals, a mechanical latch; a motor driven latch release requiring a predetermined period of time to go from a closed latched position to an open unlatched position, said motor driven latch release being coupled to said electric switch to drive said latch release toward said open position when said switch is activated and toward said closed position when said switch is not activated.
2. A system according to claim 1 further including a backup timer operatively connected to said motor driven latch release to activate the same after a preselected period of time to drive said latch release to said open position.
3. In an underwater communication system of the type including a low frequency transmitter having associated therewith spaced apart transmitting electrodes in conducting relationship with the water and substantially horizontally orientated to one another to establish an alternating electric field in the water, a receiver comprising: a neutrally buoyant electrode pole adapted for immersion in the water in a substantially horizontal orientation generally parallel to the transmitting electrodes; a pair of spaced-apart receiving electrodes carried by the pole in conductive relationship to the water so as to be in horizontal orientation when immersed; and a receiving circuit connected to the two receiving electrodes and responsive to the alternating electric field at the receiving electrodes for producing an output signal.
4. A system according to claim 3 further comprising a second neutrally buoyant electrode pole and a second pair of horizontally orientated, spaced-apart, receiving electrodes mounted on said second electrode pole and electrically connected to said receiving circuit, said electrode poles being substantially perpendicular to one another.
5. In an underwater communication system of the type including a low frequency transmitter having associated therewith at least one transmitting electrode in conductive relationship with the water to establish an alternating electric field in the water, a receiver comprising: a submersible receiver housing; a pair of horizontally oriented electrode poles extending in angular relationship from the side of the housing; a pair of receiving electrodes supported on each of the electrode poles And spaced apart along the axis of each pole; and a receiving circuit associated with the housing and electrically connected to each pair of electrodes for producing an output signal in response to an alternating electric field gradient between at least one pair of electrodes.
6. The system according to claim 5 wherein said electrode poles are neutrally buoyant and of a telescoping structure to permit collapsing of the electrode poles when not in use.
7. The system according to claim 5 further comprising a housing for said receiver and wherein said electrode poles are resiliently secured to said housing to normally maintain said horizontal and perpendicular orientations when free in the water.
8. A receiver according to claim 5, wherein: the electrode poles are generally orthoganal to each other.
9. A receiver in accordance with claim 5, further comprising: means for mounting the electrode poles to the housing to be resiliently movable relative to the housing in at least one direction.
10. An underwater communication system comprising: transmitting means including a pair of spaced-apart transmitting electrodes in conductive relationship with the water excited by a low frequency transmitter to establish a low frequency alternating electric field in the water; a pair of receiving electrodes adapted for immersion in the water and operative to produce an electrical signal when the receivers intercept the alternating electric field generated by the transmitting means; and a receiver including frequency selective means responsive to the electrical signal from the receiving electrodes to produce an electrical signal only upon interception by the receiving electrodes of alternating electric field of predetermined frequency, an integrating circuit responsive to the electrical signal from the frequency selective means for producing an intermediate electrical signal having an amplitude directly related to the duration of the signal from the frequency selective means; and amplitude selective means responsive to the intermediate signal for generating an output representing desired information whenever the intermediate signal exceeds a predetermined amplitude level.
11. A system according to claim 10 wherein said predetermined electrical signal is a continuous signal and wherein said amplitude responsive means includes a latch circuit requiring a predetermined period of time for operation, said latch circuit being driven toward an open condition when said predetermined electrical signal is present at said receiver and being driven toward a quiescent closed condition in the absence of said predetermined electrical signal.
12. A system according to claim 10, wherein said alternating electric field is amplitude modulated and said receiver responds to amplitude modulated signals.
13. A system according to claim 10 wherein said transmitting means is effective to frequency modulate said alternating electric field and said receiver is responsive to deviations in the frequency of said alternating electric field from the predetermined frequency.
14. A system according to claim 10 wherein said transmitting means pulse modulates the alternating field and said receiver is responsive to pulse modulation of said field at the receiving electrodes.
15. An underwater communications system comprising: a pair of spaced-apart transmitting electrodes in conductive relationship with the water and responsive to a predetermined electrical signal; a low frequency transmitter connected to said transmitting electrodes to establish in the water an alternating electric field in accordance with said electrical signal; an acoustic transmitting transducer responsive to the electrical signal to produce an acoustic signal in accordance therewith; a pair of spaced-apart receiving electrodes in conductive relationship with the water and adapted to be disposed within said alternating electric field to receive said predetermined elEctrical signal; an acoustic receiving transducer; and a receiver tuned to the frequency of said predetermined electrical signal and coupled to said receiving electrodes and said acoustic transducer for developing an output signal representing the predetermined electrical signal and being operative to reject unwanted signals.
16. A system according to claim 15 further comprising output circuit means coupled to said receiver and operative to produce an output signal only when the proper acoustic and electrical signals are received simultaneously.
17. A system according to claim 15 further comprising output circuit means coupled to said receiver and operative to produce an output signal when either a proper acoustic signal or a proper electrical signal is received by one of said receivers.
18. An underwater communication system, comprising: electric field generating means for establishing an electrical field in the water representing an electrical signal to be transmitted; acoustic transmitting means for propagating an acoustic wave pattern through the water simultaneously with the existence of the electric field; and underwater receiver means jointly responsive to the acoustic wave pattern and the electric field for generating a desired output signal.
19. A system according to claim 18, wherein the underwater receiver means comprises: receiving electrode means responsive to the electrical field for recovering the electrical signal therefrom; acoustic transducer means for converting the acoustic wave pattern into a second electrical signal; and means jointly responsive to the first and second electrical signals for producing the output signal.
20. A system as set forth in claim 18 wherein: the acoustic wave pattern is representative of the electric signal, thereby to establish simultaneously existing acoustic and electric fields having a common characteristic.
21. In an underwater communications system, a receiver comprising: a housing adapted for immersion in the water and carrying a mechanism capable of actuation: receiving electrode means carried by the housing and responsive to the electric field in the water in the vicinity thereof to produce an electric signal; and motor means having a rotatable member responsive to the electrical signal and operatively connected to the mechanism for actuating the mechanism upon a predetermined amount of rotation of the member.
22. A system as defined in claim 21, further comprising: a motor control circuit intermediate the receiving electrode means and the motor means and operative to actuate the motor for rotation of the rotatable member from a reference position in one direction in the presence of said electrical signal, and to actuate the motor for rotation of the member in the opposite direction toward the reference position in the absence of said electrical signal.
23. A system in accordance with claim 21, further comprising: automatic activation means carried by the housing for generating an electrical signal for actuating the motor means upon the elapse of a predetermined amount of time substantially greater than the amount of time required for rotation of the rotatable member between a reference position and a position actuating the mechanism.
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