Phase-Coded Pulse Compression - LabVolt Series by Festo ... The following safety and common symbols

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  • Telecommunications Radar

    Phase-Coded Pulse Compression

    Courseware Sample 52919-F0

  • Order no.: 52919-10 First Edition Revision level: 05/2017

    By the staff of Festo Didactic

    Festo Didactic Lte/Ltd, Quebec, Canada 2017 Internet: www.festo-didactic.com e-mail: did@de.festo.com

    Printed in Canada All rights reserved ISBN 978-2-89747-888-9 (Printed version) ISBN 978-2-89747-890-2 (CD-ROM) Legal Deposit Bibliothque et Archives nationales du Qubec, 2017 Legal Deposit Library and Archives Canada, 2017

    The purchaser shall receive a single right of use which is non-exclusive, non-time-limited and limited geographically to use at the purchaser's site/location as follows.

    The purchaser shall be entitled to use the work to train his/her staff at the purchasers site/location and shall also be entitled to use parts of the copyright material as the basis for the production of his/her own training documentation for the training of his/her staff at the purchasers site/location with acknowledgement of source and to make copies for this purpose. In the case of schools/technical colleges, training centers, and universities, the right of use shall also include use by school and college students and trainees at the purchasers site/location for teaching purposes.

    The right of use shall in all cases exclude the right to publish the copyright material or to make this available for use on intranet, Internet and LMS platforms and databases such as Moodle, which allow access by a wide variety of users, including those outside of the purchasers site/location.

    Entitlement to other rights relating to reproductions, copies, adaptations, translations, microfilming and transfer to and storage and processing in electronic systems, no matter whether in whole or in part, shall require the prior consent of Festo Didactic.

    Information in this document is subject to change without notice and does not represent a commitment on the part of Festo Didactic. The Festo materials described in this document are furnished under a license agreement or a nondisclosure agreement.

    Festo Didactic recognizes product names as trademarks or registered trademarks of their respective holders.

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  • Festo Didactic 52919-10 III

    Safety and Common Symbols

    The following safety and common symbols may be used in this manual and on the equipment:

    Symbol Description

    DANGER indicates a hazard with a high level of risk which, if not avoided, will result in death or serious injury.

    WARNING indicates a hazard with a medium level of risk which, if not avoided, could result in death or serious injury.

    CAUTION indicates a hazard with a low level of risk which, if not avoided, could result in minor or moderate injury.

    CAUTION used without the Caution, risk of danger sign , indicates a hazard with a potentially hazardous situation which, if not avoided, may result in property damage.

    Caution, risk of electric shock

    Caution, hot surface

    Caution, risk of danger. Consult the relevant user documentation.

    Caution, lifting hazard

    Caution, belt drive entanglement hazard

    Caution, chain drive entanglement hazard

    Caution, gear entanglement hazard

    Caution, hand crushing hazard

    Notice, non-ionizing radiation

    Consult the relevant user documentation.

    Direct current

  • Safety and Common Symbols

    IV Festo Didactic 52919-10

    Symbol Description

    Alternating current

    Both direct and alternating current

    Three-phase alternating current

    Earth (ground) terminal

    Protective conductor terminal

    Frame or chassis terminal

    Equipotentiality

    On (supply)

    Off (supply)

    Equipment protected throughout by double insulation or reinforced insulation

    In position of a bi-stable push control

    Out position of a bi-stable push control

  • Festo Didactic 52919-10 V

    Table of Contents

    Preface .................................................................................................................. XI

    About This Manual .............................................................................................. XIII

    To the Instructor .................................................................................................. XV

    Unit 1 Pulse Compression Systems ....................................................... 1

    DISCUSSION OF FUNDAMENTALS ......................................................... 1 Pulse systems and pulse compression ..................................... 1 An inherent problem .................................................................. 2 Pulse compression .................................................................... 3

    Ex. 1-1 Introduction to Phase-Coded Pulse Compression .................... 5

    DISCUSSION ...................................................................................... 5 Radar signals ............................................................................ 5

    Average and peak power of radar signals ................................... 7 Radar signal bandwidth ............................................................... 7

    Difficult tradeoffs ....................................................................... 8 Radar sensitivity ........................................................................ 8

    Average transmitted power .......................................................... 9 Receiver sensitivity ...................................................................... 9 Pulse width ................................................................................ 10

    A review of range resolution ................................................... 10 Pulse compression to the rescue ............................................ 13 Pulse compression coding ...................................................... 14 Demodulation .......................................................................... 15 Matched filtering ...................................................................... 17 Phase-coded pulse compression processing ......................... 19 Disadvantages of phase-coded pulse compression ............... 20

    Range sidelobes ........................................................................ 21 Summary of advantages and disadvantages .......................... 21 Observations on the PPI display ............................................. 22 The Phase-Coded Pulse Compression Processor ................. 24

    The Dual-Channel Sampler ....................................................... 26 Normalization ............................................................................. 27

    PROCEDURE .................................................................................... 27 Setup ....................................................................................... 27 A review of the LVRTS software ............................................. 28 Operation without pulse compression ..................................... 30 Range resolution without pulse compression ......................... 34 Phase-coded pulse compression ............................................ 38

    Recalibration .............................................................................. 39 Observation of phase codes ...................................................... 39

    Range resolution with compression ........................................ 43 Observations using the Oscilloscope ......................................... 43 Observations on the PPI ............................................................ 48

  • Table of Contents

    VI Festo Didactic 52919-10

    Ex. 1-2 Basic Concepts and Techniques ............................................... 55

    DISCUSSION .................................................................................... 55 Phase-code modulation .......................................................... 55 Generation of phase codes ..................................................... 57

    The Phase-Coded Pulse Compression Processor ..................... 57 Bandwidth of phase-coded signals ......................................... 58 Compression of phase-coded signals ..................................... 59

    Correlation ................................................................................. 59 Cross-correlation ........................................................................ 60 Autocorrelation ........................................................................... 62 Lag ............................................................................................. 63 Autocorrelation of a rectangular radar pulse .............................. 64 Autocorrelation of a coded radar pulse ...................................... 68 Pulse compression in a quadrature receiver .............................. 72

    Optimal binary sequences....................................................... 72 Important parameters in pulse compression ........................... 74

    Definitions .................................................................................. 74 Examples ................................................................................... 76

    All known Barker codes and their properties .......................... 77

    PROCEDURE .........