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MIMO OTH RADAR: SIGNAL MODEL FOR ARBITRARY PLACEMENT AND SIGNALS WITH NON POINT TARGETS
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MIMO-OTH RADAR: SIGNAL MODEL FOR ARBITRARY PLACEMENT AND SIGNALS WITH NON-POINT TARGETS

Category :


Sub Category : MIMO-OTH RADAR


Project Code : ITDSP03


Project Abstract

Taking into account the existence of multipath ionospheric propagation (MIP), a typical phenomenon that skywave over-the-horizon (OTH) radar may encounter, this paper develops the received signal model for a non-point target for multiple-input multiple-output skywave over-the-horizon (MIMO-OTH) radar using the most well accepted physics-based model of the ionosphere, The signal model describes the ionospheric state, the number of propagation paths between a radar antenna and the target center, as well as the correlation between reflection coefficients. It is shown that varying system parameters, such as antenna positions and signal frequencies, can result in causing the model to change from a case with highly correlated reflection coefficients  for some paths, to a case with virtually uncorrelated reflection coefficients for these same paths. Conditions are presented that describe when the highly correlated reflection coefficient case applies and when the virtually uncorrelated reflection coefficient case applies. Then, the proposed model is used to solve an example target detection problem. Some cases are shown where the performance may improve when more paths are present. The maximum possible diversity is computed and shown to increase with the number of paths which partially explains these observations. It is shown in the studied example that even if the receive antennas are closely spaced, full diversity gain may be obtained due to MIP.

EXISTING SYSTEM

            MIMO radar continues to receive attention. Compared with the conventional phased array radar, MIMO radar with closely spaced antennas provides higher degrees of freedom in terms of beam formation with the help of waveform diversity. In MIMO radar with widely spaced antennas, each transmitter- receiver pair observes the target from a different angle, which sometimes leads to improved detection and estimation performance.

 

PROPOSED SYSTEM

            MIMO-OTH radar has been shown to be capable of improving the radar resource management flexibility and transmit adaptivity. In practical limitations for MIMO-OTH radar are considered. Based on the separation of the Doppler signatures due to micro-multipaths, it was shown that MIMO-OTH radar can reliably estimate the altitude of a maneuvering target.

 

ADVANTAGES:

·         Improved detection and estimation performance

·         Increase with the number of paths

·         Higher signal-to-clutter-plus-noise ratios

 

APPLICATIONS:

·         Mobile communication

·         Wireless LAN

·         satellite communication


 
 
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