ES487211A1 - Perfeccionamientos en sistemas de transmision homodina con modulacion del factor de reflexion en emision y recepcion - Google Patents

Perfeccionamientos en sistemas de transmision homodina con modulacion del factor de reflexion en emision y recepcion

Info

Publication number
ES487211A1
ES487211A1 ES487211A ES487211A ES487211A1 ES 487211 A1 ES487211 A1 ES 487211A1 ES 487211 A ES487211 A ES 487211A ES 487211 A ES487211 A ES 487211A ES 487211 A1 ES487211 A1 ES 487211A1
Authority
ES
Spain
Prior art keywords
mixer
signal
query
reflection factor
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
ES487211A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of ES487211A1 publication Critical patent/ES487211A1/es
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
    • B61L25/02—Indicating or recording positions or identities of vehicles or trains
    • B61L25/04—Indicating or recording train identities
    • B61L25/045—Indicating or recording train identities using reradiating tags

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Optical Communication System (AREA)
  • Silicon Polymers (AREA)
  • Semiconductor Lasers (AREA)
  • Dc Digital Transmission (AREA)

Abstract

Perfeccionamientos en sistemas de transmisión homodina con modulación del factor de reflexión en emisión y transmisión, en el que la unidad de consulta (aparato lector) contiene un circuito emisor para emitir una señal de consulta a la unidad de acuse de recibe, y la unidad de acuse de recibo (aparato contestador) presenta un modulador de factor de reflexión de banda bilateral para la producción de una subportadora para la transmisión de informaciones al aparato de consulta, caracterizado porque el circuito receptor de la unidad de consulta (aparato lector) presenta dos canales de recepción enlazados en el lado de entrada a través de un divisor de potencia y conectados en el lado de salida a un elemento sumador, que contienen en cada caso un mezclador a los cuales se alimenta como señal de oscilador local para la conversen de la señal recibida a la banda base, una parte de una señal de frecuencia fija de microondas desacoplada de un generador en el circuito emisor de la unidad de consulta,porque en uno de los canales de recepción está incluido delante del mezclador o en la línea de alimentación para la señal de oscilador local al mezclador, un desfasador de microondas con desplazamiento de fase de 90º, y porque en uno de los canales de recepción está incluido entre el mezclador y el elemento sumador otro desfasador de 90º para la señal de banda base.
ES487211A 1978-12-22 1979-12-21 Perfeccionamientos en sistemas de transmision homodina con modulacion del factor de reflexion en emision y recepcion Expired ES487211A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2855808A DE2855808B1 (de) 1978-12-22 1978-12-22 Homodyn-UEbertragungssystem mit Zweiseitenband-Reflexionsfaktor-Modulator im Antwortgeraet

Publications (1)

Publication Number Publication Date
ES487211A1 true ES487211A1 (es) 1980-09-16

Family

ID=6058175

Family Applications (1)

Application Number Title Priority Date Filing Date
ES487211A Expired ES487211A1 (es) 1978-12-22 1979-12-21 Perfeccionamientos en sistemas de transmision homodina con modulacion del factor de reflexion en emision y recepcion

Country Status (8)

Country Link
EP (1) EP0012917A1 (es)
JP (1) JPS5587066A (es)
AU (1) AU5412479A (es)
DE (1) DE2855808B1 (es)
DK (1) DK551779A (es)
ES (1) ES487211A1 (es)
FI (1) FI794045A7 (es)
NO (1) NO794107L (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4739328A (en) * 1986-07-14 1988-04-19 Amtech Corporation System for identifying particular objects
JP2561534B2 (ja) * 1989-04-03 1996-12-11 山武ハネウエル株式会社 位相変調された受信信号の復調装置
JP2655127B2 (ja) * 1995-03-11 1997-09-17 日本電気株式会社 Ｆｍｃｗレーダ装置
AT501055B8 (de) * 2005-04-07 2007-02-15 Univ Graz Tech Verfahren zur demodulation und lesegerät zur auswertung lastmodulierter signale
GB0808010D0 (en) * 2008-05-02 2008-06-11 Univ Belfast Retrodirective antenna systems
GB0811635D0 (en) * 2008-06-25 2008-07-30 Univ Belfast Object identification system and method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1500289A (en) * 1974-06-03 1978-02-08 Rca Corp Homodyne communication system
US4075632A (en) * 1974-08-27 1978-02-21 The United States Of America As Represented By The United States Department Of Energy Interrogation, and detection system

Also Published As

Publication number Publication date
FI794045A7 (fi) 1981-01-01
NO794107L (no) 1980-06-24
EP0012917A1 (de) 1980-07-09
JPS5587066A (en) 1980-07-01
AU5412479A (en) 1980-06-26
DK551779A (da) 1980-06-23
DE2855808B1 (de) 1980-06-12

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