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1. (WO2010112939) IMPROVEMENTS RELATING TO SIGNAL PROCESSING

Pub. No.:    WO/2010/112939    International Application No.:    PCT/GB2010/050580
Publication Date: Fri Oct 08 01:59:59 CEST 2010 International Filing Date: Fri Apr 02 01:59:59 CEST 2010
IPC: H04B 1/28
H04B 10/12
Applicants: BAE SYSTEMS PLC
WOOD, John, Michael
PESCOD, Christopher Ralph
Inventors: WOOD, John, Michael
PESCOD, Christopher Ralph
Title: IMPROVEMENTS RELATING TO SIGNAL PROCESSING
Abstract:
A method of sampling a radio frequency signal comprises: receiving the radio frequency signal;modulating an optical signal with the radio frequency signal and an oscillator signal to generate a modulated signal;applying a filter to the modulated signal to generate an intermediate frequency signal, the filter having an intermediate pass band and an intermediate roll-off, the intermediate pass band and the intermediate roll-off in combination defining a intermediate frequency band having a first bandwidth; and sampling the intermediate frequency signal at a sampling frequency using a number of optically interleaved analogue-to-digital converters. The oscillator signal and the sampling frequency in combination are arranged such that the intermediate frequency band is defined between consecutive multiples of half of the sampling frequency. Corresponding apparatus for sampling a radio frequency signal is also disclosed. Apparatus and methods for synthesising a radio frequency signal, using similar techniques to the above, are also disclosed.