Patent ID: 9337889
Filing Date: 2016-05-10
CPC Classification: H04B

Claim Text:
1. A detector for detecting the presence of Direct Sequence Spread Spectrum (DSSS) signals transmitted by a controller to control an operation of a drone aircraft, the DSSS and other signals and noise being present in multiple spaced channels within the 2.4 GHz band, the DSSS drone aircraft control signals having a low signal to noise ratio and the noise in the 2.4 GHz band masks the presence of the DSSS signals, the detector comprising: a first antenna means for receiving any signals, including DSSS signals, and noise present in the 2.4 GHz band; receiver means connected to the first antenna means and cooperating therewith for receiving the signals, including DSSS signals, and noise in the 2.4 GHz band; a signal processor that converts the received signals from the receiver means into a digital format; and microprocessor means for performing blind processing on all signals received by the means and antenna means, and converted to digital format by the signal processor, in a first channel of the 2.4 GHz band looking for any DSSS signals, the processor means performing the blind processing by utilizing autocorrelation techniques to compare a first time sample of noise and other signals present in the first channel of the 2.4 GHz band with multiple subsequent time samples received within the first channel to detect any correlation peaks present in the first channel indicating the presence of a DSSS signal, wherein the microprocessor means repeats performing the blind processing utilizing autocorrelation techniques to compare a first time sample of noise and other signals present in the each of the other channels of the 2.4 GHz band with multiple subsequent time samples received within each of the other channels to detect any correlation peaks present in each of the other channels indicating the presence of a DSSS signal, wherein the detection of the presence of correlation peaks in any of the channels of the 2.4 GHz band by the microprocessor means indicates the presence of a DSSS signal in those channels, and wherein the microprocessor means performs no further processing on detected DSSS signals to decode those signals.