GNSS baseband receiving channel circuit

The invention provides a GNSS (Global Navigation Satellite System) baseband receiving channel circuit which comprises a sampling data selector, a carrier digital control oscillator, a digital down-conversion sub-circuit, a code digital control oscillator, a code generator, a code delay line, an integral time counter and a correlator group, a carrier digital control oscillator generates a local carrier to perform digital down-conversion with input sampling data to obtain a baseband signal subjected to carrier stripping, a code digital control oscillator pushes a code generator to generate a ranging code, a plurality of delay copies are generated through a code delay line, and the ranging code enters a correlator to be related to the baseband signal to realize code stripping. Compatible receiving of all satellite navigation system open service signals in the same baseband channel circuit is realized, two paths of ranging codes can be generated at the same time, correlation values of the two paths of ranging cod