Side peak tracking detection

A method of detecting side peak tracking by a GNSS receiver comprising a prompt correlator, the method comprising:

• receiving an incoming signal;
• generating a locally generated code signal comprising a local pseudorandom noise (PRN) code modulated with a BOC chip signal;
• multiplying a locally generated carrier signal with the incoming signal to provide a baseband signal;
• multiplying the locally generated code signal with the baseband signal to provide samples of a code removed signal;
• integrating samples of the code removed signal corresponding to a first portion of each pseudorandom noise code chip of the locally generated code signal to provide a first integration register output;
• integrating samples of the code removed signal corresponding to a second portion of each PRN code chip of the locally generated code signal to provide a second integration register output;
• and
• detecting when side peak tracking is occurring based on an absolute value of a difference between the first integration register output and the second integration register output;
• preventing the GNSS receiver from locking to side peak tracking by adjusting an offset of the prompt correlator in response to detecting when side peak tracking is occurring.

A global navigation satellite system (GNSS) receiver having at least one processor executing code to implement at least one baseband tracking channel, the baseband tracking channel comprising:

• at least one code generator to generate a local signal correlating with an incoming signal received by the GNSS receiver;
• a multiplier that multiplies the local signal with a baseband signal corresponding to an incoming signal received by the GNSS receiver to generate samples of a code removed signal, the local signal comprising a local pseudorandom noise (PRN) code modulated with a BOC chip signal;
• at least one prompt correlator including at least one integration register, wherein the at least one integration register integrates the samples of the code removed signal corresponding to a first portion of each pseudorandom noise code chip of the code removed signal to provide a first integration register output, wherein the at least one integration register integrates the samples of the code removed signal corresponding to a second portion of each PRN code chip of the code removed signal to provide a second integration register output, and wherein the at least one integration register integrates in an additive mode for the first portion and integrates in a subtractive mode for the second portion, wherein the at least one integration register is configured to be switched between the additive mode and the subtractive mode based on which portion of the PRN code chip that samples being integrated correspond to;
• and
• a side peak tracking detection module that receives integration results comprising the first integration register output and the second integration register output and generates information indicating when side peak tracking is occurring based on an absolute value of a difference between the first integration register output and the second integration register output.