| 主权项 |
1. A method for acquiring a power spectrum of an input signal, the method being implemented by means of an acquisition system for acquiring the power spectrum, the acquisition system including:
a radiofrequency signal receiver designed to be installed on board a satellite, the radiofrequency signal receiver including:
a device for frequency controlling the radiofrequency signal receiver allowing a reception frequency of the radiofrequency signal receiver to be adjusted based on a frequency command, anda filtering assembly of a bandpass filter type exhibiting a passband, referred to as the passband of the filtering assembly, having an adjustable passband width to take a set of values, the filtering assembly allowing a bandwidth of a first signal representative of the input signal of the radiofrequency signal receiver to be limited to the passband of the filtering assembly,adjustment means allowing the width of the passband of the filtering assembly to be adjusted using a filtering passband control, andpower acquisition means allowing a measurement of a power of the first signal to be delivered at an output of the filtering assembly, and control means for generating and sending to the radiofrequency signal receiver a set of power acquisition commands having successive frequency commands sent to a control device, the frequency commands being defined in such a manner that the control device adjusts the reception frequency of the radiofrequency signal receiver to successive acquisition frequencies bounding and marking out an acquisition frequency band and being spaced out from a next acquisition frequency by an acquisition step size, the set of power acquisition commands furthermore including a filtering passband control sent to the adjustment means in order to adjust the width of the passband of the filtering assembly to a predefined acquisition width while the control device adjusts the reception frequency of the radiofrequency signal receiver to the successive acquisition frequencies, the method comprising: a first step for acquiring a power spectrum of signals received by said radiofrequency signal receiver is acquired over a predefined acquisition frequency band, a step for generating and sending successive frequency commands to the control device, by the control means, in such a manner that the control device adjusts the reception frequency of the radiofrequency signal receiver to the successive acquisition frequencies spaced out one from the next by the acquisition step size, a step for generating and sending to the adjustment means, by the control means, the filtering passband control equal to the predefined acquisition width, a step for adjusting the width of the passband of the filtering assembly to the acquisition width by means of the adjustment means, a scanning step, during which the control device adjusts the reception frequency of the radiofrequency signal receiver to the successive acquisition frequencies, each time that the radiofrequency signal receiver adjusts the reception frequency to an acquisition frequency, a step for filtering the first signal by means of the filtering assembly, and a second step for acquiring, by means of the power acquisition means, the power of the first signal at the output of the filtering assembly. |
