METHOD OF FREQUENCY SEARCH OF NAVIGATION SIGNALS Russian patent published in 2008 - IPC H04B7/185 G01S5/14 

FIELD: physics.

SUBSTANCE: invention can be used in navigation signal receivers GLONASS, GPS and GALILEO, in particular, for frequency search of navigation signals. Method consists in that coherent integration is performed within time interval τ_coh for each quadrature followed with calculation of received signal envelope, while correlation signals I and Q providing time delay are developed within time interval equal to τ_coh/2. Two pairs of quadrature signals I₁ Q₁ and I₂ Q₂ are produced through time interval τ_coh to generate three resultant pairs of signals I₀ Q₀, I₊, Q₊ and L_- Q_-, the first pair being generated as a sum of signals I₁, I₂ and Q₁, Q₂, the second and third pairs being generated as a sum of I₁, Q₁ and results of signal I₂, Q₂ turned to angle ±ϕ. For each resultant pair of quadrature signals envelope values Z₀, Z₊ and Z_- are calculated to select maximum value which is, in fact output signal within analysed time-and-frequency search position.

EFFECT: reduced time of signal search due to extension of separate channel band to increase frequency search step at fixed time value of integration in quadrature correlator.

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