Patents by Inventor Vrishti Agrawal

Vrishti Agrawal has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Generation of multi-satellite GPS signals in software
    Patent number: 8040276
    Abstract: A method for testing GPS receivers may read GPS files with data for a plurality of GPS satellites, and two or more GPS satellites may be selected from that data. The method may receive parameters for a GPS receiver to be tested. The method may generate two or more GPS signals for the two or more selected GPS satellites. The method may operate on the two or more GPS signals using the received parameters for the GPS receiver to generate two or more calculated GPS signals. These two or more calculated GPS signals may be re-sampled to a common rate. The two or more re-sampled GPS signals may be added together to create a composite GPS signal. The composite GPS signal may be generated using a hardware signal generator, where the composite GPS signal used to test the GPS receiver.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: October 18, 2011
    Assignee: National Instruments Corporation
    Inventors: Sastry Vadlamani, Vrishti Agrawal, Sanjeev G. Dhumawad, Pramod Subramanyan, Abhay Samant
  • Generation of Multi-satellite GPS Signals in Software
    Publication number: 20100127918
    Abstract: A method for testing GPS receivers may read GPS files with data for a plurality of GPS satellites, and two or more GPS satellites may be selected from that data. The method may receive parameters for a GPS receiver to be tested. The method may generate two or more GPS signals for the two or more selected GPS satellites. The method may operate on the two or more GPS signals using the received parameters for the GPS receiver to generate two or more calculated GPS signals. These two or more calculated GPS signals may be re-sampled to a common rate. The two or more re-sampled GPS signals may be added together to create a composite GPS signal. The composite GPS signal may be generated using a hardware signal generator, where the composite GPS signal used to test the GPS receiver.
    Type: Application
    Filed: May 4, 2009
    Publication date: May 27, 2010
    Inventors: Sastry Vadlamani, Vrishti Agrawal, Sanjeev G. Dhumawad, Pramod Subramanyan, Abhay Samant