RF signal train generator and interferoceivers

a signal train and generator technology, applied in the direction of reradiation, distance measurement, instruments, etc., can solve the problems of only useful methods, inability to decipher the intrinsic characteristics of a short rf pulse, and the pulse delay of the input rf pulse, so as to remove multiple pulse requirements, reduce external interference from other sources, and blur the effect of stability

Inactive Publication Date: 2002-02-26
LI MING CHIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Embodiments of the present invention, which has a board functional capability, advantageously satisfy the above identified needs in the art. Embodiments of the present invention will provide an interferoceiver which is versatile and sophisticated. Such an interferoceiver will capture the intrinsic characteristics of a transient event without the blurring from its instability. In particular, embodiments of the present invention comprise optical fiber RF delay loops for storing short pulses, and reproducing their identical replicas.
In preferred embodiments of the present invention, the interferoceivers are equipped with an RF signal train generator, digitizing and intra pulse coherent processing subsystems. As a result, a new interferoceiver will be able to freeze a transient event, and will have the functional capabilities of determining the statistical distribution, which describes the instability of random, chaotic, turbulent, and transient phenomena. As those of ordinary skill in the art will readily appreciate, in the light of intra pulse coherence, the instability blurring associated with multiple pulses will no longer be a problem, and external interferences from other sources will be drastically reduced.
In other embodiments of the present invention, the RF signal train generator, digitizing and intra pulse coherent processing subsystems are directly added to conventional digitizers and interferometers to upgrade their functional capabilities as well as removing multiple pulse requirements for these instruments.

Problems solved by technology

Experimentally we can not decipher the intrinsic characteristics of a short RF pulse.
These methods are only useful to those short RF pulses which can be reproduced exactly by their respective sources.
The delay loop causes the pulse delay of the input RF pulse.
It is impossible with a conventional digitizing receiver or interferometer.

Method used

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  • RF signal train generator and interferoceivers
  • RF signal train generator and interferoceivers
  • RF signal train generator and interferoceivers

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Embodiment Construction

FIG. 1 shows a block diagram of an optical fiber RF delay loop 100 for use in fabricating embodiments of the present invention. This is the same optical fiber RF delay loop as in the parent patent applications of optical fiber based radars and optical RF stereo. As shown in FIG. 1, the optical RF signals through optical fiber 121 are applied as input to switchable coupler 120. Switchable coupler 120 switches the optical RF signals from optical fiber 121 into optical fiber loop 110. Isolator 140 assures the optical RF signals in optical fiber loop circulating only in one direction. As the optical RF signals circulate the optical fiber loop 110, the strength of optical RF signals reduces. The reduction is compensated by in-line optical amplifier (OA) 130 to keep the optical RF signals circulating in the loop again and again until switchable coupler 120 is closed. A portion of optical RF signals is switched from optical fiber loop 110 to optical fiber 122 and the remainder of optical R...

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Abstract

New apparatus <DEL-S DATE="20020226" ID="DEL-S-00001">comprise a<DEL-E ID="DEL-S-00001"> <INS-S DATE="20020226" ID="INS-S-00001">comprises an <INS-E ID="INS-S-00001">optical fiber based RF signal train generator for storing transient RF pulses and regenerating the identical replicas for analysis. The apparatus further <DEL-S DATE="20020226" ID="DEL-S-00002">comprise<DEL-E ID="DEL-S-00002"> <INS-S DATE="20020226" ID="INS-S-00002">comprises an <INS-E ID="INS-S-00002">RF <DEL-S DATE="20020226" ID="DEL-S-00003">receivers<DEL-E ID="DEL-S-00003"> <INS-S DATE="20020226" ID="INS-S-00003">receiver <INS-E ID="INS-S-00003">to process one stored pulse with a reference to <DEL-S DATE="20020226" ID="DEL-S-00004">other<DEL-E ID="DEL-S-00004"> <INS-S DATE="20020226" ID="INS-S-00004">another <INS-E ID="INS-S-00004">stored pulse. The present invention drastically increases our abilities to investigate acoustical, electromagnetic, and optical transient phenomena.

Description

TECHNICAL FIELD OF INVENTIONThis invention relates to .Iadd.an .Iaddend.apparatus which .[.utilize.]. .Iadd.utilizes .Iaddend.an optical fiber loop based RF signal train generator to store transient pulses and regenerate their identical replicas for analysis. The present invention drastically increases our abilities to investigate acoustical, electromagnetic, and optical transient phenomena.BACKGROUNDInterferometer is a widely used instrument. The constituents of interferometers may vary, but they all comprise these essential elements: a source, a splitter, two paths, and a detection apparatus. The source may generate acoustical, electromagnetic, and light wave, which is split into two paths by the splitter. The detection apparatus compares waves from the two paths, and .[.determine.]. .Iadd.determines .Iaddend.their variational differences. Interferometer is a powerful instrument, which is capable of probing micro, meso, and macro systems. A system under test may be the source, the...

Claims

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Application Information

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IPC IPC(8): G01S13/00G01S13/87G01S7/48G01S7/495G01S7/288G01S7/40G01S7/285H04B10/22H04K3/00G01S13/86G01S7/00G01S7/28G01S7/282
CPCG01S7/288G01S7/4052G01S7/495G01S13/87H04B10/22G01S13/003G01S7/003G01S7/282G01S2007/4091G01S13/86H04K2203/12H04K2203/14G01S7/4091
InventorLI, MING-CHIANG
OwnerLI MING CHIANG