Accord Software & Systems Pvt. Ltd.

Accord Softwire and Systems Pvt. Ltd.

Muralikrishna Srikantiah

Nagaraj Channarayapatna Shivaramaiah

Purushotham Subbarao

Mannur Ragavendra Shenoy

A system and method of achieving a reduced time for first fix in a global positioning system receiver (GPS). The GPS receiver includes a low gate count sequential multitap correlator () in combination with a digital signal processor () and a down converter (). The low gate count sequential multitap correlator () conducts sequential correlation on the incoming GPS signals using a multitapping and pipelining scheme. The multitapping process involves tapping the shift register and simultaneously correlating the signal samples and tapped chips. The pipelining process includes sampling data, mapping incoming samples, shifting carrier acquisition code, multiplying and accumulating the code and signal products. The digital signal processor conducts the frequency search.

Low gate count sequential multitap correlator

This invention is directed to a receiver in a Global Positioning System Receiver that performs both correlation and navigation function to facilitate channel configuration. The receiver changes the sampling frequency in the software to interface with any type of radio frequency down converter. The correlator is incorporated within the navigation processing unit which resides in a programmable digital signal processor chip. A sampling clock directly connects the digital signal processor to radio frequency down converter.

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Bengaluru, India

Muralikrishna Srikantiah