Joint receiver and receiving method for navigation signals located at adjacent frequencies

A joint receiving method for navigation signals located at adjacent frequencies comprising:

• receiving a first navigation signal and a second navigation signal which are located at adjacent frequencies;
• and
• calculating a frequency estimation of a virtual wideband navigation signal constructed based on the first navigation signal and the second navigation signal, and obtaining a delay estimation of navigation based on the frequency estimation, wherein the virtual wideband navigation signal is an asymmetric navigation signal having a virtual carrier and a virtual sub-carrier, wherein the frequency estimation comprises a virtual carrier frequency estimation, a virtual sub-carrier frequency estimation and a code frequency estimation of the virtual wideband navigation signal;
• obtaining first navigation signal correlations through correlating a local replica of the first navigation signal against the first navigation signal as received;
• obtaining second navigation signal correlations through correlating a local replica of the second navigation signal against the second navigation signal as received;
• and
• pre-processing the first navigation signal correlations and the second navigation signal correlations to compensate an asymmetry of the virtual wideband navigation signal;
• combining the pre-processed correlations to decouple the virtual carrier and the virtual sub-carrier of the virtual wideband navigation signal;
• and obtaining the virtual carrier frequency estimation, the virtual sub-carrier frequency estimation and the code frequency estimation of the virtual wideband navigation signal based on the combined pre-processed correlations,
• wherein the method is performed by a receiver comprising a receiving channel and a processor.

A non-transitory machine-readable storage storing machine executable instructions, wherein the machine executable instructions are executable by a processor to:

• receive through a receiving channel a first navigation signal and a second navigation signal which are located at adjacent frequencies;
• calculate a frequency estimation of a virtual wideband navigation signal constructed based on the first navigation signal and the second navigation signal, and obtain a delay estimation of navigation based on the frequency estimation, wherein the virtual wideband navigation signal is an asymmetric navigation signal having a virtual carrier and a virtual sub-carrier, wherein the frequency estimation comprises a virtual carrier frequency estimation, a virtual sub-carrier frequency estimation and a code frequency estimation of the virtual wideband navigation signal;
• obtain first navigation signal correlations through correlating a local replica of the first navigation signal against the first navigation signal as received;
• obtain second navigation signal correlations through correlating a local replica of the second navigation signal against the second navigation signal as received;
• and
• pre-process the first navigation signal correlations and the second navigation signal correlations to compensate an asymmetry of the virtual wideband navigation signal;
• combining the pre-processed correlations to decouple the virtual carrier and the virtual sub-carrier of the virtual wideband navigation signal;
• and obtaining the virtual carrier frequency estimation, the virtual sub-carrier frequency estimation and the code frequency estimation of the virtual wideband navigation signal based on the combined pre-processed correlations.