Method and device for calibrating a receiver

摘要

The invention relates to a method for calibrating an antenna of a receiver of signals (s1, . . . , sN) originating from a plurality of sources, said receiver comprising a plurality of sensors (c1, . . . , cM), characterized in that it comprises the following steps:
measurement of a phase shift (dm,n measure) for each of the sensors (c1, . . . , cM) on each of the signals (s1, . . . , sN),determination of at least one attitude value of the antenna, said attitude being defined by a set of coordinates,calculation, for each of the sensors on each of the signals, of a theoretical phase shift (dm,n theoretical) as a function of the attitude of the antenna, from the directions of arrival of the signals,calculation of a bias (β1 sensor m) for each of the sensors from the measured phase shifts (dm,n measure) and from the theoretical phase shifts (dm,n theoretical) of the sensor.

主权项

1. Method for calibrating an antenna of a receiver of signals originating from a plurality of sources, said receiver comprising a plurality of sensors mounted on a moving craft, characterized in that it comprises the following steps:
measurement of a phase shift for each of the sensors on each of the signals, determination of at least one attitude value of the antenna, said attitude being defined by a set of coordinates, calculation, for each of the sensors on each of the signals, of a theoretical phase shift as a function of the attitude of the antenna, from directions of arrival of the signals, calculation of a bias for each of the sensors from the measured phase shifts and from the theoretical phase shifts of the sensor and; using the calculated bias for each of the sensors to calibrate the respective sensor and thereby calibrate the antenna wherein the step of determination of at least one attitude value of the antenna comprises the determination of a plurality of antenna attitude hypotheses, for each determined attitude hypothesis,
calculation of a bias for each of the sensors from the measured phase shifts and from the theoretical phase shifts of the sensor,calculation of a likelihood indicator of the attitude hypothesis, from the measured phase shifts, from the theoretical phase shifts and from the calculated biases, selection of the biases for which the value of the likelihood indicator is the lowest wherein the calibration and the selection of the values for the biases of the sensors may be repeated on the moving craft, wherein the bias of the sensors being independent of the directions of arrival of the signals, the calculation of a bias β1 sensor m for each of the sensors from the measured phase shifts and from the theoretical phase shifts of the sensor is performed according to a weighted average,β~1⁢⁢sensor⁢⁢m⁡(ψ,θ,φ)=1N⁢∑n=1N⁢w⁡(σn,αn)·(dm,n⁢⁢measured-dm,n⁢⁢theoretical⁡(ψ,θ,φ)) with {tilde over (β)}1 sensor m (ψ,θ,φ) being the bias of a sensor m, for a heading ψ, a trim θ and an inclination φ and w(σn, αn) being a weighting of the source n, dependent on σn, an angle of elevation in a sensor coordinate system and on αn, an azimuth angle in the sensor coordinate system, dm,n measured being the measured phase shift for the sensor m for the signal n, dm,n theoretical(ψ,θ,φ) being the theoretical phase shift for the sensor m for the signal n and for the heading ψ, the trim θ and the inclination φ, and N being the number of signals.