Granted Patent B2

US 12,748,219 · App. 18/619,473 · Granted Sep 29, 2026

Inventors: Ramsey Faragher (Cambridge, GB); Nicolas Couronneau (Cambridge, GB); Robert Mark Crockett (Cambridge, GB)

Assignee: Focal Point Positioning Limited

G01S19/47G01S19/23

Abstract

Claims (42)

1 . A method for performing signal correlation for a signal processing system, comprising:

receiving a plurality of signals from a plurality of remote sources;

generating a plurality of local signals;

correlating one or more of the local signals with the plurality of received signals to generate a plurality of correlation results;

compensating a phase of at least one of the local signals, the received signal, and the correlation results based on a plurality of hypotheses regarding at least one system parameter to generate a plurality of phase-compensated correlation results;

combining the plurality of phase-compensated correlation results to generate a joint correlation score;

determining a preferred hypothesis in the plurality of hypotheses that maximizes the joint correlation score; and

using the preferred hypothesis to estimate a value of a parameter associated with the signal processing system.

2 . The method of claim 1 , wherein the parameter comprises a frequency-related parameter.

3 . The method of claim 2 , wherein the frequency-related parameter comprises frequency, frequency evolution, or frequency and frequency evolution.

4 . The method of claim 2 , wherein the frequency-related parameter is defined by an n-order polynomial, where n has a value that is greater than or equal to 2.

5 . The method of claim 2 , wherein the frequency-related parameter comprises a frequency of a local oscillator signal used to control a phase of at least one of the local signals.

6 . The method of claim 1 , further comprising determining a motion of a portion of the signal processing system, and wherein the compensating is based, at least in part, on the determined motion.

7 . The method of claim 6 , wherein at least one hypothesis in the plurality of hypotheses is based, at least in part, on the determined motion of the portion of the signal processing system.

8 . Apparatus for performing signal correlation within a signal processing system, comprising at least one processor and at least one non-transient computer-readable medium for storing instructions that, when executed by the at least one processor, cause the apparatus to perform operations comprising:

receiving a plurality of signals from a plurality of remote sources;

generating a plurality of local signals;

correlating one or more of the local signals with a plurality of the received signals to generate a plurality of correlation results;

compensating a phase of at least one of the local signals, the received signal, and the correlation results based on a plurality of hypotheses regarding at least one system parameter to generate a plurality of phase-compensated correlation results;

combining the plurality of phase-compensated correlation results to generate a joint correlation score;

determining a preferred hypothesis in the plurality of hypotheses that maximizes the joint correlation score; and

using the preferred hypothesis to estimate a value of a parameter associated with the signal processing system.

9 . The apparatus of claim 8 , wherein the parameter comprises a frequency-related parameter.

10 . The apparatus of claim 9 , wherein the frequency-related parameter comprises frequency, frequency evolution, or frequency and frequency evolution.

11 . The apparatus of claim 10 , wherein the frequency-related parameter is defined by an n-order polynomial, where n has a value that is greater than or equal to 2.

12 . The apparatus of claim 9 , wherein the frequency-related parameter comprises a frequency of a local oscillator signal used to control a phase of at least one of the local signals.

13 . The apparatus of claim 8 , wherein the operations further comprise determining motion of a portion of the signal processing system, and wherein the compensating is based, at least in part, on the determined motion.

14 . The apparatus of claim 13 , wherein each hypothesis in the plurality of hypotheses is based, at least in part, on the determined motion of the portion of the signal processing system.

15 . A computer readable medium comprising instructions that when executed by a computer cause the computer to perform operations for performing signal correlation for a signal processing system, comprising:

receiving a plurality of signals from a plurality of remote sources;

generating a plurality of local signals;

correlating one or more of the local signals with a plurality of the received signals to generate a plurality of correlation results;

compensating a phase of at least one of the local signals, the received signal, and the correlation results based on a plurality of hypotheses regarding at least one system parameter to generate a plurality of phase-compensated correlation results;

combining the plurality of phase-compensated correlation results to generate a joint correlation score;

determining a preferred hypothesis in the plurality of hypotheses that maximizes the joint correlation score; and

using the preferred hypothesis to estimate a value of a parameter associated with the signal processing system.

16 . The computer readable medium of claim 15 , wherein the parameter comprises a frequency-related parameter.

17 . The computer readable medium of claim 16 , wherein the frequency-related parameter comprises frequency, frequency evolution, or frequency and frequency evolution.

18 . The computer readable medium of claim 17 , wherein the frequency-related parameter is defined by an n-order polynomial, where n has a value that is greater than or equal to 2.

19 . The computer readable medium of claim 16 , wherein the frequency-related parameter comprises a frequency of a local oscillator signal used to control a phase of at least one of the local signals.

20 . The computer readable medium of claim 15 , wherein the operations further comprise determining motion of a portion of the signal processing system, and wherein the compensating is based, at least in part, on the determined motion.

21 . The computer readable medium of claim 20 , wherein each hypothesis in the plurality of hypotheses is based, at least in part, on the determined motion of the portion of the signal processing system.

Assignments (1)

Priority Claims (1)

Continuity (4)

References Cited (192)