Enhanced emitter location using adaptive combination of time shared interferometer elements
a technology of time shared interferometer and enhanced emitter location, which is applied in the direction of direction finders, instruments, measurement devices, etc., can solve the problems of ghosting and degraded localization, significantly larger error rate, and poor precision
Inactive Publication Date: 2004-07-15
RAYTHEON CO
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Benefits of technology
The patent describes a system that uses an interferometer array to process pulse signals from a target emitter. The system has multiple processing channels that work together with a switch matrix to switch different combinations of radiator elements to the channels. This allows for the processing of all radiator signals within a single pulse of the target emitter. The technical effect of this system is improved processing of pulse signals from a target emitter.
Problems solved by technology
Most systems support a limited number of simultaneous interferometer channels over several antenna elements resulting in ghosting and degraded localization particularly in dense emitter environments.
Prior attempts depended on de-interleaving pulse trains and could coherently combine only a limited number of interferometer elements resulting in significantly larger error rates and poorer precision.
Method used
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[0007] For an interferometer, coherent (complex voltage) measurements from each element are used to determine the relative phases and derive the angles of arrival of the emitter. For reduced costs the number of simultaneous emitter channels can be reduced. This reduction in the number of simultaneous receive channels can cause angle ambiguities. A technique is described to overcome this deficiency.
[0008] Fast intra-pulse switching reduces ghosting from multiple emitters and achieves accurate two-dimensional (2-D) angle of arrival on a single pulse basis. Coherent combination can be employed to achieve the enhanced performance of large interferometer arrays with a limited number of simultaneous channels.
[0009] Fast intra-pulse switching among interferometer elements is provided by currently available switches. Using an adaptive element switching strategy and coherent combination of elements, very precise localization of emitters is achieved within a short time without the de-interlea...
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An interferometer array system and method for processing pulse signals from a target emitter includes an n element interferometer array of radiator elements for producing radiator signals in response to the pulse signals from the target emitter. M processing channels process radiator signal elements, where m<n. A switch matrix is connected between the array and the processing channels, switching different combinations of the radiator elements to the channels within a single pulse to achieve processing of all radiator signals within a single pulse of said pulse signals from the target emitter.
Description
BACKGROUND OF THE DISCLOSURE[0001] Interferometer arrays are used to provide accurate localization of emitters. Most systems support a limited number of simultaneous interferometer channels over several antenna elements resulting in ghosting and degraded localization particularly in dense emitter environments. Current implementations also depend on the accurate de-interleaving of pulse trains from different emitters.[0002] Prior attempts depended on de-interleaving pulse trains and could coherently combine only a limited number of interferometer elements resulting in significantly larger error rates and poorer precision.SUMMARY OF THE DISCLOSURE[0003] An interferometer array system for processing pulse signals from a target emitter includes an n element interferometer array of radiator elements for producing radiator signals in response to the pulse signals from the target emitter. M processing channels process radiator signal elements, where m<n. A switch matrix is connected bet...
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IPC IPC(8): G01S3/48
CPCG01S3/48
Inventor KRIKORIAN, KAPRIEL V.ROSEN, ROBERT A.
Owner RAYTHEON CO