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Jay

Hello. My name is Jay Salsburg. I created this Forum to allow open discussion of RADAR, its technology and its applications.

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Jay
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  • Signal Processing Techniques for RADAR...Signal Conditioning  Analogue Bandpass Filter Channel EqualizationLinear Least Squares (LLS)Adaptive filtering  Active Noise ControlCross-correlation processing Discrete Fourier transform Two Dimensional Cros…
  • If you do not know how Phase-Locked-Loops (PLL) work, very simply, they are complex non-linear circuits comprising a low pass filter (sometimes the filter is dynamic), a 2 input comparator, one or more programmable counters, and a Voltage Controlled…
  • In the USA, most major cities have at least one Station broadcasting Digital HD FM. This source of constant modulation energy seems to be overlooked for Passive RADAR. These Digital transmissions seem to be ideal for overcoming Range Ambiguity diffi…
    in Passive RADAR Comment by Jay June 2015
  •  Here is a synopsis of the Physical Layer. (Part 3 of 3)  (incomplete)Passive RADARSignal Processing Attributes· In addition to determining Range; to determine Angle of Arrival (Targeting), 5 sets of Receivers/Antennae are necessary; 7 sets are much…
    in Passive RADAR Comment by Jay June 2015
  •  Here is a synopsis of the Physical Layer. (Part 2 of 3)  (incomplete)Passive RADARTransmitter Attributes (Standard Broadcast FM and TV)· No control of signal but understand its characteristics.· Wide Bandwidth reveals greater Range detail and resol…
    in Passive RADAR Comment by Jay June 2015
  • Here is a synopsis of the Physical Layer. (Part 1 of 3)  (incomplete)Passive RADAR · A subclass of Bistatic RADAR. · Uses someone else's Transmitter (can be 100,000 Watts or more), usually Broadcast FM and TV. · Another version may use Cellular Tele…
    in Passive RADAR Comment by Jay June 2015
  • In this image the 2 dongles are mounted in a water-tight box with f-connectors to the outside of the box. Not shown, this box is then mounted in a Faraday box to shield the dongles from unwanted EMI.
  • I successfully tied 2 Dongles together, one clock driving the other after carefully removing its crystal. The trick to a stable and reliable sharing of clocks from one dongle to the other is to add a very small RF capacitor to the source dongle's cr…
  • These inexpensive TV Tuner Dongles that have recently become available below $20, are not appropriate for RADAR Receivers as is. However, it appears their hardware may be hacked to become a useful "Front end" Tuner for RADAR reception.
  • A passive FPAA based RF scatter meteor detector My Comment: While this is a comprehensive White Paper, no attempt is made by the authors to guide the enthusiast toward a working prototype; no mention of what to purchase, what equipment was used to m…
  • CAD scale model of earth-space in relation to my receiver. Even thought the NAVSPASUR RADAR has been decommissioned, this drawing gives the enthusiast for Forward Scatter observations a good idea how Forward Scatter scales to the size of the Earth, …
  • Reference Signal Reconstruction for Digital Transmissions When digital transmissions are exploited by a Passive RADAR, the multipath removal from the reference signal can be performed by demodulating the signal received at the reference antenna. A q…
    in Passive RADAR Comment by Jay May 2015
  • Constant Modulus Algorithm for Reference Signal Cleaning Using Analog Modulation To investigate the performance degradation of a Passive RADAR exploiting a reference signal affected by multipath, the following model is adopted for complex envelope o…
    in Passive RADAR Comment by Jay May 2015
  • SIGNAL PROCESSING TECHNIQUES FOR REFERENCE SIGNAL CLEANING AND RECONSTRUCTION The cancellation and the 2D-CCF evaluation algorithms presented in the previous sections assume the availability of a clean reference signal that corresponds to a high qua…
    in Passive RADAR Comment by Jay May 2015
  • DIRECT SIGNAL AND MULTIPATH/CLUTTER CANCELLATION TECHNIQUES As is intrinsic in the passive radar concept that involves parasitically exploiting an existing transmitter of opportunity, the characteristics of the transmitted waveform are not under the…
    in Passive RADAR Comment by Jay May 2015
  • EVALUATION OF THE 2D-CCF FOR PASSIVE RADAR COHERENT INTEGRATION The evaluation of the bistatic range-velocity 2D-CCF is the key step in the Passive RADAR processing chain. It corresponds to the implementation of a bank of matched filters, each one t…
    in Passive RADAR Comment by Jay May 2015
  • More Rules Passive RADAR exploits existing illuminators of opportunity which results in the possibility of low cost surveillance, covert operation, and reduced electromagnetic pollution. 2D-CCF represents costly processing steps in terms of computat…
    in Passive RADAR Comment by Jay May 2015
  • 2D-CCF and interference cancellation.While the basic detection scheme is fully defined by the previously mentioned described cancellation and integration techniques, the effectiveness of the Passive Radar operation can be largely enhanced by conside…
    in Passive RADAR Comment by Jay May 2015
  • The Navy Space Surveillance System A complete system for satellite detection and tracking, now decommissioned after more than 50 years in continuous operation, this PDF White Paper circa 1959, discusses details of the NAVSPASUR Space Fence. Before i…
  • http://www.salsburg.com/NAVSPASUR/
  • 2D-CCFWhile it is not especially challenging to evaluate the 2D-CCF from a signal processing point of view, it can be in terms of the computational load that it requires for real-time application. The long integration times (order of magnitude of se…
    in Passive RADAR Comment by Jay May 2015
  • Passive RADAR has received renewed interest for surveillance purposes. It allows for target detection and localization with many advantages such as low cost, covert operation, low vulnerability to electronic countermeasure, and reduced electromagnet…
    in Passive RADAR Comment by Jay May 2015
  • Books and Papers of interest... Principles of Modern Radar, Vol. II: Advanced Techniques,William L. Melvin, James A. Scheer, Georgia Institute of TechnologyISBN 978-1-891121-53-1 (hardback)ISBN 978-1-61353-024-5 (PDF) The Scientist and Engineer's Gu…
    in Passive RADAR Comment by Jay May 2015
  • 22C3: I See Airplanes!
    in Passive RADAR Comment by Jay May 2015
  • Intent My efforts with Passive RADAR are to create a receiver/software/computer set allowing the user to monitor local activity in the space nearly overhead; above the line between a local transmitter and the user’s receiver set.  Over the horizon F…
    in Passive RADAR Comment by Jay May 2015
  • Rules of Passive RADAR (Ongoing) Minimum configuration; One transmitter, 2 receivers, 2 antennae.The minimum of 2 receivers are phase-locked to the same timebase (clock/crystal).2 antenna, one on each receiver some form of isolation from each other …
    in Passive RADAR Comment by Jay May 2015
  • My name is Jay Salsburg. I live in Shreveport, Louisiana, USA.  I have embarked on a project to create a low cost Passive RADAR Receiver set, now ongoing for many years. Originally, what peeked my interest in Meteor RADAR was my success detecting Me…
    in Passive RADAR Comment by Jay May 2015
  • Passive RADAR; more difficult than folding Bowling Balls, here is knowing why. Cross – Correlation is the signal process needed to extract echoes from Passive RADAR reception. Conceptually it removes the greater signal from the lesser signal leaving…
    in Passive RADAR Comment by Jay May 2015
  • Block Diagram of a proposed Passive RADAR Receiver for monitoring reflections from FM Standard Broadcast Radio Transmitters utilizing 2 modified SoftRock-like SDRs. For Passive RADAR, Dynamic Range is far more important than wide Bandwidth. Broadban…
    in Passive RADAR Comment by Jay May 2015
  • Geometry of Meteor Region in relation to Passive RADAR antennae.  The volume of Space able to be monitored by Passive RADAR is immense. While not effective for Over-the-Horizon detection, movement in Near Earth Orbit as far away as 300 miles is poss…
    in Passive RADAR Comment by Jay May 2015