PARSAX An Informal Look at Radar Technology and Applications within TU Delft

21Jun/100

Invitation for the Second TU Delft Remote Sensing Colloquium

RemoteSensing@TUDelft

23 June 2010, 14:00-17:00
Bordewijkzaal (19th floor - room HB 19.130)
Faculty Electrical Engineering, Mathematics and Computer Science (EWI)
Mekelweg 4

Dear colleague,

Within TU Delft, several research groups use Remote Sensing techniques. As these groups are distributed over various faculties (EWI, CITG, LR), we believe it would be beneficial to learn about each others activities. For this reason, we had proposed to organize recurring informal meetings, in which we would inform each other on current research activities and results. Especially PhD projects are worth wile to present to a wider audience.

After the successful first meeting last January, we would like to invite you for the second meeting of 'RemoteSensing@TUDelft' which will take place at 23 June, 14:00-17:00 at the Faculty of Electrical Engineering, Mathematics and Computer Science, Bordewijkzaal (19th floor - room HB 19.130). This meeting will include 3 presentations of PhD studies. We would appreciate your visit.

Program:

  • Francesco Belfiori (EWI(RSE) - TNO): Digital Beamforming for Uniform Circular Arrays
  • Faisal Karim (Departement of Water Resources,CiTG,TUDelft): Remote Sensing of Soil Mositure
  • Julius T. Fricke (LR (Acoustic Remote Sensing) and KNMI) : Interferometric Studies of the Atmosphere with A Large Aperture Infrasound Array

Kind regards,
On behalf of:
Ramon Hanssen, Peter Hoogeboom, Herman Russchenberg, Nick van de Giesen, Roland Klees, Dick Simons, Wim Bastiaanssen, Massimo Menenti, Boudewijn Ambrosius, Huub Savenije

8Jun/101

Touching Radar History

Deckname Würzburg by Arthur O. BauerSearching the Internet for some radar-related keywords I've found a site of the Foundation  "Stichting Centrum voor Duitse Verbindingen en aanverwante Technologieën" (Foundation Centre for German Communication and related Technology), which was established on 7 Dec. 1994, in The Netherlands with objectives to preserve the history of science and technology, concerning the electrics and electronics hardware and software. Their main focus is on central European countries prior 1960, as far as it regards to the science and/or high quality commercial engineering (no consumer technologies).

On that site a few enthusiasts presented results of their amazing hobby - collection of historical documents, photos and even examples of real equipment that shows the important milestones in the development of radio-communication, radar technology and electronics in Germany during first half of the last century. There are a few very interesting manuscripts by Arthur O. Bauer, which reviewing their studies, - "Hülsmeyer and the early days of radar inventions, sense and nonsense, a survey" (Part I and Part II), Deckname "Würzburg" (full-scale book about one of the first military operational radar, in German), Some Aspects of German Airborne Radar Technology, 1942 to 1945 (A paper contribution to the Autumn DEHS Symposium at Shrivenham (UK), on 19 Oct. 2006). And many-many more articles, patents, historical documents, photos, descriptions and documentation of old radio-technical equipment and components.

They are even running a practical project for Würzburg radar reparation, reporting progress and results!

What can be said? Nice job, nice hobby and thanks to authors for making all collected materials publicly available.

4Jun/100

Video Lectures from MIT Lincoln Laboratory

Introduction to Radar Systems

Dr. Robert M. O’DonnellThis set of 10 lectures is presented by Dr. Robert M. O'Donnell. It starts with an introductory description of basic radar concepts and terms.  The radar equation needed for the basic understanding of radar is then developed, along with several examples of its use in radar system design.  Radar propagation issues, such as attenuation, multipath effects and ducting, are described.  The concept of radar cross-section, waveform design, antennas, transmitter and receiver characteristics and the detection of radar signals in the presence of noise are presented. Some radars are required to detect small targets in the presence of much larger radar echoes from sea or land "clutter" in the radar's coverage.  The characteristics of this "clutter" are discussed, along with moving target indicator (MTI) and Pulse Doppler techniques for mitigating the negative effects of "clutter."  The course continues with lectures covering target tracking and target parameter estimation. The last lecture discusses radar transmitters and receivers.

Click on titles below to the view the lectures and/or download the pdf files of the viewgraghs for each lecture.

  1. Introduction
  2. Radar Equation
  3. Propagation Effects
  4. Target Radar Cross Section
  5. Detection of Signals in Noise and Pulse Compression
  6. Radar Antennas
  7. Radar Clutter and Chaff
  8. Signal Processing - MTI and Pulse Doppler Techniques
  9. Tracking and Parameter Estimation
  10. Transmitters and Receivers

Adaptive Antennas and Phased Arrays

Dr. Alan J. FennThis lecture series, given by Dr. Alan J. Fenn, begins with a discussion of the fundamentals of adaptive antennas pertaining to radar and communications systems, with an emphasis on consumption of adaptive array degrees of freedom from the jammer's viewpoint.

Displaced phase center antenna array mutual coupling effects in the problem of adaptive suppression of radar clutter is discussed in Lecture 2. Next, in Lectures 3 through 5 a theoretical foundation for a focused near-field technique that can be used to quantify the far-field adaptive nulling performance of a large aperture adaptive phased array system is described. Simulations of focused near-field and focused far-field nulling performance for adaptive arrays are presented for arrays of isotropic elements in Lecture 3 and for arrays including mutual coupling effects in Lectures 4 and 5. Experimental testing of the focused near-field adaptive nulling technique for phased arrays is described in Lecture 6. An experimental high-resolution multiple-beam adaptive-nulling antenna system is described in Lecture 7. Lectures 8 through 16 then concentrate on phased array antenna development for a variety of array elements. Lecture 8 provides an introduction to phased array antenna theory. In Lecture 9, finite and infinite array analyses and measurements for periodic phased arrays of monopole elements are presented. Lecture 10 describes the focused near-field polarization characteristics of monopole phased arrays as related to adaptive array testing in the near field. Next, in Lecture 11 a test bed phased array that implements the displaced phase center antenna technique, as related to the analysis presented in Lecture 2, is described along with the planar near field testing technique that is used to assess adaptive clutter cancellation performance. The planar near field scanning method for measuring low-sidelobe radiation patterns of phased arrays is described in Lecture 12. Experimental arrays of horizontally polarized loop-fed slotted cylinder antennas (Lecture 13), dual-polarized dipole arrays (Lecture 14), and ultrawideband dipole arrays (Lecture 15) are described. In Lecture 16, rectangular waveguide arrays are analyzed by the method of moments.

Click on titles below to the view the lectures and/or download the pdf files of the viewgraghs for each lecture.

Lectures Overview for Adaptive Antennas and Phased Arrays

  1. Adaptive Antennas and Degrees of Freedom
  2. Array Mutual Coupling Effects on Adaptive Radar Clutter Suppression
  3. Focused Near-Field Techniques for Evaluating Adaptive Phased Arrays
  4. Moment Method Analysis of Focused Near-Field Adaptive Nulling
  5. Focused Near-Field Testing of Multiphase-Center Adaptive Array Radar Systems
  6. Experimental Testing of Focused Near-Field Adaptive Nulling
  7. Experimental Testing of High Resolution Nulling with a Multiple Beam Antenna
  8. Phased Array Antennas - An Introduction
  9. Monopole Phased Array Antenna Design, Analysis, and Measurements
  10. Monopole Phased Array Field Characteristics in the Focused Near-Field Region
  11. Displaced Phase Center Antenna Measurements Using Near-Field Scanning
  12. Low-Sidelobe Phased Array Antenna Measurements Using Near-Field Scanning
  13. Arrays of Horizontally Polarized Omnidirectional Elements
  14. Finite Arrays of Crossed V-Dipole Elements
  15. Experimental Ultrawideband Dipole Antenna Array
  16. Finite Rectangular Waveguide Phased Arrays
4Jun/100

PARSAX project in the STW Jaarverslagen 2009

The brief description of our progress in the PARSAX project included in recently published  STW Annual report 2009 (Jaarverslagen 2009 van Technologiestichting STW, page 51) - "PARSAX radar observes formation and life of water droplets in clouds" (Parsax-radar bekijkt ontstaan en levensduur van waterdruppels in wolken).

PARSAX project in STW Annual report 2009