Patent ID: 7196587
Filing Date: 2007-03-27
Classification: G01S,H03L

Abstract:
1. A swept frequency source comprising a phase-locked loop frequency synthesiser, the phase-locked loop including: a voltage-controlled oscillator; means for generating a first swept waveform; means for modulating the voltage-controlled oscillator with the first swept frequency waveform added to a loop correction signal; a reference frequency source; a frequency/phase discriminator means for generating an output voltage which by means of a loop filter forms the loop correction signal so controlling the voltage-controlled oscillator, the frequency/phase discriminator means having a first input for receiving an input from the reference frequency source and a second input; means for generating a lineariser IF signal whose frequency is in a predetermined relationship to the instantaneous output frequency of the voltage-controlled oscillator; and feedback path means for feeding back the lineariser IF signal comprising: