1. K-State home
  2. »Research Foundation
  3. »Technologies
  4. »Patents

Research Foundation

Antenna for GPS, Galileo and GLONASS Systems with Superior Multipath Characteristics

Reference Number: 11-09

Inventor: Saeed Khan


Multipath has remained a problem for all three types of satellite navigation receivers (GPS, Galileo, and GLONASS) even with current technologies used to address this issue. Analytical models show that for a GPS L1C/A the time to detect a satellite signal increases considerably under conditions of multipath interference which is caused by reflection, refraction and diffraction for satellite signals. Additionally, Unmanned Aerial Vehicles (UAVs) and other mobile platforms that are plagued by multipath signals in urban canyon environments are aided. Traditionally, two different approaches have been used to cope with the multipath problem, the first involves signal processing (analyzing and interpreting signals) and the other is to design an antenna (spatial processing) that is capable of rejecting multipath signals.

Researchers at Kansas State University have proposed a solution that employs an antenna design which rejects multipath by cutting off signals that arrive at elevation angles low to the horizon; it has the ability to work with different receiver architectures and does not require any additional processing time for the purpose of mitigation. The antenna has superior multipath rejecting capabilities that allow satellite based navigation in urban canyon-type environments.

  • Greater multipath rejection from incident elevation angles beyond 600
  • Out-performs other antennas on the market (Choke Ring and RSW)
  • Higher gain for line-of-sight signals when compared with other antennas
  • Overall physically smaller antenna than other “multipath rejecting” options
  • Potentially offers anti-jam protection from ground based sources
  • GPS, Galileo and GLONASS satellite navigation systems
  • Superior multipath rejecting antennas for cars, tanks, and armored vehicles
  • Navigation antennas for unmanned aerial vehicles (UAVs)
  • Capable of being mounted on precision guided munitions (PGM)
Patent Status
  • Provisional patent application filed in May 2012.

Kansas State University Research Foundation seeks to have discussions with companies that are interested in licensing and/or research collaborations.

Interested parties should contact:

Kansas State University Institute for Commercialization (KSU-IC)
2005 Research Park Circle Manhattan, KS 66502
Tel: 785-532-3900 Fax: 785-532-3909
E-Mail: ic@k-state.edu