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1. (WO2018019960) METHOD AND APPARATUS FOR THE RECEPTION OF A DS/FH SIGNAL

Pub. No.:    WO/2018/019960    International Application No.:    PCT/EP2017/069076
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Fri Jul 28 01:59:59 CEST 2017
IPC: G01S 19/29
G01S 19/30
H04B 1/7073
H04B 1/7156
Applicants: QINETIQ LIMITED
Inventors: MACLEOD, Malcolm David
Title: METHOD AND APPARATUS FOR THE RECEPTION OF A DS/FH SIGNAL
Abstract:
A method for the reception of a frequency hopped direct sequence spread spectrum signal comprises acquiring the signal by splitting the received signal into a plurality of processing sub-channels, each corresponding to one or more hop frequencies; and within each sub-channel: i) subtracting any sub-carrier frequency from the received signal; ii) filtering the signal from (i) using a chip-matched filter; iii) selecting a sub-set of samples from the filtered signal; iv) correlating the sampled signal from step (iii) with a known reference signal to produce at least one correlator output. The output(s) from each sub-channel are provided to an input of a corresponding one or more common discrete time Fourier transforms (DTFT), and an output therefrom having a peak above a predetermined threshold is selected for further processing in the receiver. Once acquired, the method provides for a less computationally expensive way of tracking the signal. The method, and system implementing the method, may be used for demodulating appropriately modulated signals, and has particular application in satellite navigation receivers.