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Project: Radar Waveforms Generation & Analysis by Matlab Prepared for: Dr. Mohammed Ouda Islamic University of GAZA (IUG) Done By: Jalal Al-Roumy 120050239.

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Presentation on theme: "Project: Radar Waveforms Generation & Analysis by Matlab Prepared for: Dr. Mohammed Ouda Islamic University of GAZA (IUG) Done By: Jalal Al-Roumy 120050239."— Presentation transcript:

1 Project: Radar Waveforms Generation & Analysis by Matlab Prepared for: Dr. Mohammed Ouda Islamic University of GAZA (IUG) Done By: Jalal Al-Roumy Akram Abu-Raida

2 * Outlines:  Choice importance.  Factors of choice.  Classification.  Pulse shapes.  Major types.  Matlab Codes.  References. 2

3 * Why is waveform’s type so important? The correct choice of waveform defines all the main characteristics of the radar as: - Performance of target detection. - Resolution (angular, range and frequency). - Measurement ( range, velocity & error). - Classification and recognition. 3

4 *Factors of the selection of a particular waveform : Requirements of : - Range coverage. - Doppler coverage. - Detection probability. - Resolving capability. - Measurement errors. - Interference rejection. - Enhanced modes of operation. - Cost and complexity. 4

5 * waveform’s Classification : Depends on the parameter chosen for classification : - Character of variation in time domain. - Usage of intra-pulse modulation or not. - Pulse compression type. - Frequency-coded waveforms types. - Phase-coded waveforms types. - Discretization. 5

6 * The most popular pulse shapes : - Sinusoidal. - Rectangular. - Gaussian. - Triangular. - Sawtooth. - Exponential. 6

7 * Pulse Shapes: 7

8 8

9 * Main Waveforms : 9

10 1- CW Waveforms : - Eqn. : Et = E0 cosw0t. - Used: CW,Doppler & Bistatic Radars. - Advantages : - Simplified design. - Low power. - Measure target velocity. - Disadvantages: - Need coding to determine range. - Tx & Rx separation at high power. 10

11 2- FMCW Waveforms : - Eqn. : f(t) = f0 + αt. - Used: In CW radars. - Generation: Active & Passive. - Advantages : - Less sensitive to doppler shifts. - Disadvantages: - Has range-doppler cross coupling -> measurement errors. - Range sidelobes are high -> weighting required -> 1-2 dB loss in SNR. 11

12 3- Simple Pulse : - Eqn. : Et = E0 cosw0t. (for T on ), Et = 0 (for T off ). - Used: Old Radars, Inexpensive Radars. - Types: long & short. - Advantages : - Low cost. - Long: doppler resolution. - Short: range resolution. - Disadvantages: - Long: range resolution. - Short: doppler resolution. 12

13 4- LFM Waveforms : - Eqn. : f(t) = f0 + αt. - Used: In pulse radars. - Generation: Active & Passive. - Advantages : - Less sensitive to doppler shifts. - The easiest to generate. - Disadvantages: - Has range-doppler cross coupling -> measurement errors. - Range sidelobes are high -> weighting required -> 1-2 dB loss in SNR. 13

14 5- NLFM Waveforms : - Eqn. : - Types: Symmetrical & Asymmetrical. - Advantages : - Very low range sidelobes. - For tracking systems. - Disadvantages: - Complex. - The limited developments. 14

15 6- Phase-coded Waveforms : - Types : binary & polyphase. - Codes: Barker, P-codes. - Advantages : - low range sidelobes. - Preferred in jamming conditions. - Disadvantages: - Poor resolution in presence of distributed clutter. - The implementation is more complex than that of LFM. 15

16 16

17 * Matlab Code: 17

18 * CW Code: 18

19 * LFMCW Code: 19

20 * LFMCW Code: 20

21 * NLFM Code: 21

22 * Uncoded Pulse: 22

23 * References : - Skolnik, Radar Handbook, 2nd Ed., McGraw-Hill, Barton & Leonov, Radar Technology Encyclopedia, Artech House, US Navy, Aviation Electricity And Electronics, NAVEDTRA Mahafza & Elsherbeni, MATLAB Simulations for Radar Systems Design. - Levanon & Mozwson, Radar Signals. 23


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