Radar Environment RF Generation. Dr. Steffen Heuel Technology Manager Aerospace & Defense Rohde & Schwarz Munich, Germany
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1 Radar Environment RF Generation Dr. Steffen Heuel Technology Manager Aerospace & Defense Rohde & Schwarz Munich, Germany
2 Typical navigation radar scenario Turning navigation radar antenna Tx Tx Tx Tx Rx Rx 1 +Rx 2 Rx N W E S Return from land clutter North West East Visualization on a radar screen Echoes are displayed in so called range cells Coherent radars can also measure speed and can therefore also display an echo in a Doppler cell The larger the radar return signal, the larger the radar cross section i.e. the object, the larger the dot on the screen South 2
3 Conventional Test set-up for navigation radar testing Test ship with radar under test on board Tx Tx Tx Tx Rx Rx 1 +Rx 2 Rx Artificial targets deployed on sea Return from land clutter ı Test Concept for Navigation Radars Mount a real radar under test on a boat Deploy artificial targets at the sea ı Test Concept for airborne radars Set up a flight campaign with artificial targets or use civil aircrafts ı Test concept for ground radars Set-up field-test in large area to test performance 3
4 Motivation and Approach Sea Clutter Simulation Target Simulation 4
5 Reduce Cost, complexity & test time Field-to-lab Improve Accuracy, reliability & repeatability
6 Sea clutter generation
7 Radar Detection Probability Density Function Rayleigh Distribution Threshold Rice Distribution P FA P M P D False Alarm Probability Probability of Missing a Target Probability of Missing Detection
8 Received Power Typical Sea Clutter PPI view Range How to simulate time and spatial correlated sea clutter?
9 Two scale model of the sea surface ı Capillary waves Wavelength of centimeters or less Driven by local wind gusts Stochastic model ı Gravity waves Wavelength of a few hundred meters down to a meter Created by stable winds over a large area Courtesy of wikipedia.org Physical model Courtesy of waterswaytravel.com
10 Two scale model of the sea surface
11 Capillary waves Stochastic model capillary waves Rayleigh distributed ı Following Rayleigh distribution Rayleigh distributed noise: ı SIRP procedure can be used for generation if IQ data is available ı Otherwise uncorrelated Rayleigh distributed noise with mean level according to physical model Δy Δx
12 Gravity Waves Physical Model gravity waves arbitrary distributed ı Use established model to simulate sea surface Parameters: average wave height and period, spreading factor, sampling frequency Simulation of sea surface heights ı Transform height of sea surface to have a Chi-distribution Transformation is performed with the help of memoryless nonlinear transformation (MLNT) Shape parameter can be estimated using available formulas Δy Δx
13 Data verification and signal generation
14 IPIX data recorded on Canadian East Coast in 1993 KS-Test passed in 83% using significance level α=
15 Environment to multisegment waveform A Map environment to waveforms A R R... Radar PPI A R
16 Environment simulation using multisegment waveform (MSW) ı Multisegment waveform (MSW) consists of multiple independent waveforms ı Each radar TX Pulse triggers a segment (and the next segment ) I/Q data time.. Segment Marker Segment Marker Segment Marker
17 Radar echo generation and environment simulation R&S FSW R&S Radar Echo Generation DigIQ, LAN, Ref RF In Additional RF Signals, Echoes, Jamming etc. TX RX Radar under Test R&S SMW RF Out + Antenna Headmarker TX Puls Marker Sea Clutter
18 Measurement setup in the laboratory Vector Signal Generator Radar PPI Signal and Spectrum Analyser Dummy Load X-Band Radar TRX Circulator
19 Simulated Sea Clutter Max range set to 1.5NM X-Band Radar PPI Screenshot Simulation Sea clutter Moving target Radar suppresses sea clutter in close range
20 Recorded Sea Clutter Max range set to 12NM ı Single radar echo signal, moving target with 100m/s in 5NM range ı Recorded sea clutter Sea clutter Moving target
21 Test of Interference Rejection Interference rejection Switched off ı Coastline ı Sea clutter in close range ı R&S Pulse Sequencer Software to add interference / jamming signals ı Verify interference rejection Artefacts due to another present solid state radar
22 Thank you for your attention!
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