Back to results
US 2017/0248677 A1Published application
Interference detection and rejection for wide area positioning systems
AssigneeNextNav, LLC
InventorsMIR HAMZA MAHMOOD, ARUN RAGHUPATHY, ANDREW SENDONARIS
Life of this patent
Estimating the term…
Abstract
Detecting and mitigating the effects of interference in a positioning system. A received signal is divided into a plurality of receive signal time/frequency (RSTF) values. A plurality of threshold values are determined based on expected energy values for the received signal. In one implementation, if a predetermined number of the RSTF values are above the threshold, the received signal is determined to be corrupt.
Claims20
A method for detecting and mitigating the effects of interference, the method comprising:
- a) receiving a signal;
- b) determining a plurality of receive signal time-frequency (RSTF) values, each RSTF value indicating the time-frequency spectrum of the received signal in a particular time slot and within a particular frequency bin;
- c) establishing a plurality of threshold values, each based upon at least one of a plurality of expected energy values and each further associated with at least one of the plurality of frequency bins;
- d) determining that all or a portion of the received signal is acceptable if a RSTF value of a frequency bin is below the threshold value corresponding to the frequency bin of the RSTF;
- e) producing, using the received signal and the determination, acceptable signal values, wherein the acceptable signal values are produced by performing one or both of generating acceptable signal values and identifying acceptable signal values;
- and
- f) estimating the position of the receiver using the acceptable signal values.
4 more elements
A system for detecting and mitigating the effects of interference, the system comprising:
- a) a front end having an output, wherein the front end receives a signal from a transmitter and outputs a received signal;
- b) a spectrum analyzer having an input and an output, the input coupled to the front end and the output providing a plurality of receive signal time-frequency (RSTF) values, each RSTF value indicating the time-frequency spectrum of the received signal in a particular time slot and within a particular frequency bin;
- c) a threshold module having an output through which a plurality of threshold values are output, wherein the threshold module establishes a plurality of threshold values, wherein each of the plurality of threshold values are based upon a corresponding one of a plurality of expected energy values and further associated with a corresponding one of the plurality of frequency bins;
- d) an interference detection module having a first input for receiving the threshold values from the threshold module, a second input coupled to the spectrum analyzer, and an output operable to provide an indication if all or a portion of the received signal is acceptable, wherein the interference detection module determines if all or a portion of the received signal is acceptable if a RSTF value of a frequency bin is below the threshold value corresponding to the frequency bin of the RSTF;
- e) an interference rejection module having a first input coupled to the output of the front end, and second input for receiving the determination of whether all or a portion of the received signal is acceptable, and an output for outputting acceptable signal values, wherein the interference rejection module produces acceptable signal values by performing one or both of generating acceptable signal values or identifying acceptable signal values;
- and
- f) a position determination module having a first input coupled to the output of the interference rejection module for receiving the acceptable signal, wherein the position determination module estimates the position of the receiver using the acceptable signal values.
4 more elements
Dependencies are inferred from the claim text.