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Direct Path Cancellation in Satellite Signal Based Forward Scattering Radar

Esmaeili Asl, Amin | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52537 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Behroozi, Hamid
  7. Abstract:
  8. Passive bistatic radars (PBR) using transmitters of opportunity have attracted a lot of attention recently. Advantages of these radars include the covert operation as well as the low cost of their building and maintenance. Such radars are intended to use signals in the environment as transmitters. These transmitters can be terrestrial transmitters such as TV broadcasts or even satellite transmitters such as global positioning system (GPS) satellites.Satellite transmitters have global coverage and their signal is available at all times, but the design of these transmitters for non-radar applications causes the reduction of the reception power at receivers. So BR systems have attempted to use forward scattering mode. In forward scatter radars (FSR), The radar cross section (RCS) is greatly enhanced which helps to improve the received power. Also, RCS independence of the target’s texture and geometry makes these radars very attractive for the use against stealth targets. The most important challenge in bistatic radars is to cancel the direct path interference, which is more important in forward radars due to the problem geometry. The coverage area of the forward scatter radars is very small, which is also one of the challenges of FSR.In this thesis, we discuss about these challenges. To cancel the direct path interference, we first propose an adaptive algorithm and compare it with existing adaptive methods.To evaluate the proposed algorithm, we use the GPS signal as a transmitter. In the following, we investigate the scattering region in the FSR, and for the multi-transmitter and multi-receiver modes we make a comparison between the GPS and the geosynchronous equatorial orbit (GEO) satellites
  9. Keywords:
  10. Cross Sections Radar ; Passive Radar ; Direct Path Interference ; Forward Scattering Radar ; Opportunity Transmitter ; Passive Bistatic Radars

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