False reacquisition mitigation in high sensitivity navigational satellite signal receivers

A method for reacquisition of signals in a global satellite navigation receiver, the method comprising:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of carrier frequency values comprises searching carrier frequency values in a range based on a duration of signal blockage and receiver dynamics:
• declaring a valid reacquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-determined high threshold value;
• and
• declaring a valid reacquisition at the selected dwell if the maximum power of the selected dwell is below the predetermined high threshold value, the maximum power of the selected dwell is above a predetermined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.

A method for reacquisition of signals in a global satellite navigation receiver, the method comprising:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of carrier frequency values comprises searching carrier frequency values in a range based on duration of signal blockage, results of PYT computation, quality of the PVT results, and receiver dynamics;
• declaring a valid reacquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-determined high threshold value;
• and
• declaring a valid reacquisition at the selected dwell if the maximum power of the selected dwell is below the predetermined high threshold value, the maximum power of the selected dwell is above a predetermined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.

A method for reacquisition of signals in a global satellite navigation receiver, the method comprising:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of PN code phase values comprises searching PN code phase values in a range based on duration of signal blockage and receiver dynamics;
• declaring a valid reacquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-deterrnined high threshold value;
• and
• declaring a valid reacquisition at the selected dwell if the maximum power of the selected dwell is below the predetermined high threshold value, the maximum power of the selected dwell is above a predetermined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.

A method for reacquisition of signals in a global satellite navigation receiver, the method comprising:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of PN code phase values comprises searching PN code phase values in a range based on duration of signal blockage, results of PVT computation, quality of the PVT computation results, and receiver dynamics;
• declaring a valid reacquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-determined high threshold value;
• and
• declaring a valid reacquisition at the selected dwell if the maximum power of the selected dwell is below the predetermined high threshold value, the maximum power of the selected dwell is above a predetermined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.

A global satellite navigation receiver device comprising an RF front end for receiving signals originating from navigation satellites, a baseband section receiving IF signals from the RF front end and generating one-millisecond correlation values, and a processor receiving correlation values from the baseband section, wherein the processor performs reacquisition of signals by:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of carrier frequency values comprises searching carrier frequency values in a range based on a duration of signal blockage and receiver dynamics;
• declaring a valid reaquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-determined high threshold value;
• and
• declaring a valid requisition at the selected dwell if the maximum power of the selected dwell is below the predetermined high threshold value, the maximum power of the selected dwell is above a pre-determined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.

A global satellite navigation receiver device comprising an RF front end for receiving signals originating from navigation satellites, a baseband section receiving IF signals from the RF front end and generating one-millisecond correlation values, and a processor receiving correlation values from the baseband section, wherein the processor performs reacquisition of signals by:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of carrier frequency values comprises searching carrier frequency values in a range based on duration of signal blockage, results of PVT computation, quality of the PVT results, and receiver dynamics;
• declaring a valid reacquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-determined high threshold value:
• and
• declaring a valid reacquisition at the selected dwell if the maximum power of the selected dwell is below the predetermined high threshold value, the maximum power of the selected dwell is above a pre-determined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.

A global satellite navigation receiver device comprising an RF front end for receiving signals originating from navigation satellites, a baseband section receiving IF signals from the RF front end and generating one-millisecond correlation values, and a processor receiving correlation values from the baseband section, wherein the processor performs reacquisition of signals by:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of PN code phase values comprises searching PN code phase values in a range based on duration of signal blockage and receiver dynamics;
• declaring a valid reacquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-determined high threshold value;
• and
• declaring a valid reacquisition at the selected dwell if the maximum power of the selected dwell is below the predetermined high threshold value, the maximum power of the selected dwell is above a pre-determined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.

A global satellite navigation receiver device comprising an RF front end for receiving signals originating from navigation satellites, a baseband section receiving IF signals from the RF front end and generating one-millisecond correlation values, and a processor receiving correlation values from the baseband section, wherein the processor performs reacquisition of signals by:

• collecting, for each carrier frequency and PN code phase dwell within a selected frequency range and selected code phase range, a sequence of correlation values derived from signals originating from a navigational satellite, wherein the collecting comprises performing a search of PN code phase values within the selected code phase range, followed by a search of carrier frequency values within the selected frequency range, and wherein the search of PN code phase values comprises searching PN code phase values in a range based on duration of signal blockage, results of PVT computation, quality of the PVT computation results, and receiver dynamics;
• declaring a valid reacquisition at a selected dwell if a maximum power of the selected dwell exceeds a pre-determined high threshold value;
• and
• declaring a valid reacquisition at the selected dwell if the maximum power of the selected dwell is below the predetermined hinh threshold value, the maximum power of the selected dwell is above a pre-detennined low threshold value, and the maximum power of the selected dwell is above a maximum power of all other dwells in the selected frequency range and selected code phase range.