Processing of interference on a radiofrequency signal by power inversion
AssigneeThales
InventorsEstelle Kirby, Alain Renard
Life of this patent
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Abstract
The invention relates to a radiofrequency receiver, notably for satellite positioning applications, needing to operate in an environment where interference is dense, notably when it involves pulses transmitted by DME beacons. Below the useful signal suppression threshold, amplitude or power are inverted to improve the dynamic interference response time. Advantageously, the useful signal suppression threshold and the set point power or amplitude are determined by analyzing the amplitude or power probability density function in its part enriched with low amplitude/power samples.
Claims16
A device for receiving a radiofrequency navigation signal comprising:
- a module for estimating a characteristic quantity of said radiofrequency navigation signal chosen from at least one of amplitude or power group;
- a module for filtering said characteristic quantity;
- and
- a module for inverting said characteristic quantity by multiplying said radiofrequency navigation signal by the inverse of the filtered estimated amplitude or power, wherein at least one of the estimating, filtering and inverting modules receives as an input an output of an estimating module of a thermal noise of said receiving device while correcting an estimation bias of said characteristic quantity to ensure an optimal or quasi optimal gain of said receiving device.
A method of processing a radiofrequency navigation signal comprising:
- receiving the radiofrequency navigation signal;
- a step for estimating a characteristic quantity of said radiofrequency navigation signal chosen from at least one of amplitude or power group;
- a step for filtering said characteristic quantity;
- and
- a step for inverting said characteristic quantity by multiplying said radiofrequency navigation signal by the inverse of the filtered estimated amplitude or power, wherein at least one of the steps for estimating, filtering and inverting receives as an input an output of an estimating module of a thermal noise of said method of processing while correcting an estimation bias of said characteristic quantity to ensure an optimal or quasi optimal gain of said method of processing.
Dependencies are inferred from the claim text.