Topcon Positioning Systems, Inc.

Dmitry Anatolievich Rubtsov

Andrey Vladimirovich Veitsel

Alexey Stanislavovich Lebedinsky

Leonid Victorovich Purto

GNSS receiver includes first type correlators and a maximum selecting unit selecting an output from the first type correlators, and with a common control of all the correlators in code delay, carrier phase and carrier frequency; second type correlators with individual control in code delay of each correlator or each sub-group of second type correlators and with common control of all second type correlators in carrier phase and frequency; and a processor. The first type correlators can convolve one quadrature only, and demodulates CSK symbols, the second type correlators calculate discriminator values for CSK-modulated signal DLL, the demodulated data then is used by the processor to produce improved position and velocity.

Method and system for demodulating and tracking of CSK-modulated signals

A method for demodulating and tracking of CSK-modulated signals comprising the steps of receiving a CSK-modulated signal at a plurality of correlators, the CSK-modulated signal including a transmitted symbol; convolving the CSK-modulated signal with a preset reference replica of the CSK-modulated signal for N shifts (D. . . D) of a PRN code relative to an internal receiver clock corresponding to N possible code shifts in the transmitted symbol, and M other code shifts (T. . . T), where M&#x3c;N, that satisfies D&#x2212;&#x394;T&#x2264;T&#x2264;D+&#x394;T for all Tfrom (T. . . T); selecting one of the N shifts (D) where the convolution is a maximum; adjusting a CSK-signal Delay Locked Loop (DLL) based on a ratio of convolution values for the shifts Dand Tfor all Tfor which a modulus |D&#x2212;T| is smaller than a predefined threshold; and determining a value of the transmitted symbol based on D.

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Moscow, Russia

Dmitry Anatolievich Rubtsov