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0003-v0.0.18-adding-spoofing-detection.patch
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0003-v0.0.18-adding-spoofing-detection.patch
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From 76a56d549a5f9729715f09e9dd6a5b865f242b37 Mon Sep 17 00:00:00 2001
From: Gwenhael Goavec-Merou <[email protected]>
Date: Fri, 28 Jul 2023 16:09:56 +0200
Subject: [PATCH 3/3] adding spoofing detection
Signed-off-by: Gwenhael Goavec-Merou <[email protected]>
---
.../adapters/uhd_signal_source.cc | 22 +-
.../adapters/uhd_signal_source.h | 4 +
.../signal_source/libs/CMakeLists.txt | 2 +
.../signal_source/libs/spoofing_detection.cc | 317 ++++++++++++++++++
.../signal_source/libs/spoofing_detection.h | 103 ++++++
5 files changed, 447 insertions(+), 1 deletion(-)
create mode 100644 src/algorithms/signal_source/libs/spoofing_detection.cc
create mode 100644 src/algorithms/signal_source/libs/spoofing_detection.h
diff --git a/src/algorithms/signal_source/adapters/uhd_signal_source.cc b/src/algorithms/signal_source/adapters/uhd_signal_source.cc
index 8deea3a47..72cc743c1 100644
--- a/src/algorithms/signal_source/adapters/uhd_signal_source.cc
+++ b/src/algorithms/signal_source/adapters/uhd_signal_source.cc
@@ -21,6 +21,7 @@
#include "gnss_sdr_filesystem.h"
#include "gnss_sdr_string_literals.h"
#include "gnss_sdr_valve.h"
+#include "spoofing_detection.h"
#include "jamming_detection.h"
#include "sgd.h"
#include <glog/logging.h>
@@ -63,8 +64,18 @@ UhdSignalSource::UhdSignalSource(const ConfigurationInterface* configuration,
clock_source_ = configuration->property(role + ".clock_source", std::string("internal"));
otw_format_ = configuration->property(role + ".otw_format", std::string("sc16"));
RF_channels_ = configuration->property(role + ".RF_channels", 1);
+ spoofing_protection_ = configuration->property(role + ".spoofing_protection", 0);
sgd_ = configuration->property(role + ".sgd", 0);
jamming_ = configuration->property(role + ".jamming_protection", 0);
+ if (spoofing_protection_ !=0)
+ {
+ printf("Spoofing protection %d\n",spoofing_protection_);
+ RF_channels_=spoofing_protection_; // spoofing protection: override RF_channels in this block only => N inputs and RF_chan=1 output
+ subdevice_ = configuration->property(role + ".subdevice", std::string("A:A A:B"));
+ spoofing_averages=configuration->property(role + ".spoofing_averages", Navg);
+ spoofing_threshold=configuration->property(role + ".spoofing_threshold", STD_THRESHOLD);
+ spoofing_detect_=gnss_sdr_make_spoof(spoofing_threshold, spoofing_averages); // threshold on phase standard deviation (rad), number of averages
+ }
if (sgd_ != 0)
{
printf("SGD jamming protection %d\n",sgd_); fflush(stdout);
@@ -85,7 +96,7 @@ UhdSignalSource::UhdSignalSource(const ConfigurationInterface* configuration,
jamming_threshold=configuration->property(role + ".jamming_threshold", NORM_THRESHOLD);
jamming_xcorr_=gnss_sdr_make_jamm(jamming_threshold, jamming_averages);
}
- if ((sgd_ == 0) && (jamming_==0))
+ if ((spoofing_protection_==0) && (sgd_ == 0) && (jamming_==0))
{
subdevice_ = configuration->property(role + ".subdevice", empty);
}
@@ -342,6 +353,11 @@ void UhdSignalSource::connect(gr::top_block_sptr top_block)
DLOG(INFO) << "connected usrp source to file sink RF Channel " << i;
}
}
+ if (spoofing_protection_ != 0)
+ {
+ top_block->connect(uhd_source_, i, spoofing_detect_, i);
+ printf("UHD -> Spoofing connect: %d\n",i);fflush(stdout);
+ }
if (sgd_ != 0)
{
top_block->connect(uhd_source_, i, jamming_sgd_, i);
@@ -401,6 +417,10 @@ gr::basic_block_sptr UhdSignalSource::get_right_block(int RF_channel)
{
return valve_.at(RF_channel);
}
+ if ( spoofing_protection_ != 0ULL)
+ {
+ return spoofing_detect_;
+ }
if ( jamming_sgd_ != 0ULL)
{
return jamming_sgd_;
diff --git a/src/algorithms/signal_source/adapters/uhd_signal_source.h b/src/algorithms/signal_source/adapters/uhd_signal_source.h
index eb1d685c7..b97cd45ab 100644
--- a/src/algorithms/signal_source/adapters/uhd_signal_source.h
+++ b/src/algorithms/signal_source/adapters/uhd_signal_source.h
@@ -60,6 +60,7 @@ public:
private:
gr::uhd::usrp_source::sptr uhd_source_;
+ gnss_shared_ptr<gr::block> spoofing_detect_;
gnss_shared_ptr<gr::block> jamming_sgd_;
gnss_shared_ptr<gr::block> jamming_xcorr_;
@@ -89,10 +90,13 @@ private:
double sample_rate_;
size_t item_size_;
int RF_channels_;
+ int spoofing_protection_;
int sgd_;
int jamming_;
int jamming_averages;
+ int spoofing_averages;
double jamming_threshold;
+ double spoofing_threshold;
unsigned int in_stream_;
unsigned int out_stream_;
};
diff --git a/src/algorithms/signal_source/libs/CMakeLists.txt b/src/algorithms/signal_source/libs/CMakeLists.txt
index b19c63ba8..681f827eb 100644
--- a/src/algorithms/signal_source/libs/CMakeLists.txt
+++ b/src/algorithms/signal_source/libs/CMakeLists.txt
@@ -33,6 +33,7 @@ set(SIGNAL_SOURCE_LIB_SOURCES
rtl_tcp_dongle_info.cc
gnss_sdr_valve.cc
sgd_impl.cc
+ spoofing_detection.cc
jamming_detection.cc
gnss_sdr_timestamp.cc
${OPT_SIGNAL_SOURCE_LIB_SOURCES}
@@ -42,6 +43,7 @@ set(SIGNAL_SOURCE_LIB_HEADERS
rtl_tcp_commands.h
rtl_tcp_dongle_info.h
gnss_sdr_valve.h
+ spoofing_detection.h
jamming_detection
sgd.h
${OPT_SIGNAL_SOURCE_LIB_HEADERS}
diff --git a/src/algorithms/signal_source/libs/spoofing_detection.cc b/src/algorithms/signal_source/libs/spoofing_detection.cc
new file mode 100644
index 000000000..d3bc50e2d
--- /dev/null
+++ b/src/algorithms/signal_source/libs/spoofing_detection.cc
@@ -0,0 +1,317 @@
+/*!
+ *
+ * -------------------------------------------------------------------------
+ *
+ * Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
+ *
+ * GNSS-SDR is a software defined Global Navigation
+ * Satellite Systems receiver
+ *
+ * This file is part of GNSS-SDR.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -------------------------------------------------------------------------
+ */
+
+#include "spoofing_detection.h"
+#include <glog/logging.h> // for LOG
+#include <gnuradio/io_signature.h> // for io_signature
+#include <algorithm> // for min
+#include <cstring> // for memcpy
+#include <unistd.h> // for usleep
+#include <utility>
+#include <volk/volk.h>
+//#define CHUNK_SIZE (2048*8*2) // ~1023 MS/s/16384=30~Hz/bin moved to .h
+#define KEEPSIZE 600 // 30 Hz/bin * 600 = ~+/-20 kHz
+#define MAXSAT 20 // too many satellites will start detecting genuine constellation ?
+#define MAXKEEP 7 // too many satellites will start detecting genuine constellation ?
+#define MEMORY_LEN 5 // remember spoofing even std rises suddendly
+#define moycpl // average complex (if active) or average mag/phase (if inactive)
+
+#pragma message("Spoofing detection compile")
+
+
+Gnss_Spoofing_Protect::Gnss_Spoofing_Protect(float threshold, int averages) : gr::sync_block("spoofing_detection",
+ gr::io_signature::make(1, 20, sizeof(gr_complex)),
+ gr::io_signature::make(1, 1, sizeof(gr_complex))),
+ d_threshold(threshold),
+ d_averages(averages)
+{
+ printf("Gnss_Spoofing_Protect\n");
+/*
+Ron Economos (April 5, 2020 10:58 AM)
+To: [email protected]
+I would use set_output_multiple() instead. See my previous e-mail for an
+example.
+https://lists.gnu.org/archive/html/discuss-gnuradio/2019-08/msg00188.html
+*/
+ set_output_multiple(CHUNK_SIZE); // only trigger processing if that amount of samples was accumulated
+ first_time_=0;
+ memset(spoofing_average_mul,0,sizeof(gr_complex)*KEEP_SIZE*2);
+ memset(spoofing_average_div,0,sizeof(gr_complex)*KEEP_SIZE*2);
+ avg_index_=0;
+ num_file_=0;
+ weight_=1.;
+ stdargres_=10.;
+ spoofing_memory_=0;
+}
+
+#if GNURADIO_USES_STD_POINTERS
+std::shared_ptr<Gnss_Spoofing_Protect> gnss_sdr_make_spoof(float threshold, int averages)
+{
+// unsigned int alignment = volk_get_alignment();
+ std::shared_ptr<Gnss_Spoofing_Protect> spoofing_detect_(new Gnss_Spoofing_Protect(threshold, averages));
+ return spoofing_detect_;
+}
+#else
+boost::shared_ptr<Gnss_Spoofing_Protect> gnss_sdr_make_spoof(float threshold, int averages)
+{
+// unsigned int alignment = volk_get_alignment();
+ boost::shared_ptr<Gnss_Spoofing_Protect> spoofing_detection(new Gnss_Spoofing_Protect(threshold, averages));
+ printf("Spoofing detection: variable created\n");
+/*
+ spoofing_average=(gr_complex*)volk_malloc(sizeof(gr_complex)*KEEP_SIZE*2,alignement); // 2* since sta followed by sto -> must fftshift to put 0 at center
+ bufout0_sta=(gr_complex*)volk_malloc(sizeof(gr_complex)*KEEP_SIZE,alignement);
+ bufout0_sto=(gr_complex*)volk_malloc(sizeof(gr_complex)*KEEP_SIZE,alignement);
+ bufout_sta=(gr_complex*)volk_malloc(sizeof(gr_complex)*KEEP_SIZE,alignement);
+ bufout_sto=(gr_complex*)volk_malloc(sizeof(gr_complex)*KEEP_SIZE,alignement);
+*/
+ return spoofing_detection;
+}
+#endif
+
+int Gnss_Spoofing_Protect::work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+{ long unsigned int ch = 0;
+ int i,c,cnt;
+ uint16_t maxpos;
+ unsigned int alignment = volk_get_alignment();
+ float maxval,maxvallim;
+ gr_complex weightcpl={0.,0.};
+ gr_complex* bufin;
+ int opposite=0;
+#ifdef moycpl
+ gr_complex stddiv[MAXSAT];
+ gr_complex integral;
+#else
+ float meanarg,meanabs,stdarg[MAXSAT],stdabs[MAXSAT],weightabs=0.,weightarg=0.;
+#endif
+ gr_complex meandiv;
+/*
+ FILE *fo;
+ char filenam[256];
+*/
+ int count;
+ const gr_complex* in;
+ gr_complex* carre=(gr_complex*)volk_malloc(sizeof(gr_complex)*CHUNK_SIZE, alignment);
+// see https://github.com/gnss-sdr/gnss-sdr/blob/master/src/algorithms/acquisition/gnuradio_blocks/pcps_acquisition_fine_doppler_cc.h for declaration of gr::fft
+// gr::fft::fft_complex* plan = new gr::fft::fft_complex(CHUNK_SIZE, true);
+ bufin=plan->get_inbuf();
+// printf("Spoofing block: %d items, %ld out, %ld in\n",noutput_items,output_items.size(),input_items.size());
+// Spoofing block: 32768 items, 1 out, 2 in
+ if (input_items.size()!=2) first_time_=1; // don't save if other than 2 input channels
+/////////// CHECK FILES RUN AT THE SAME RATE
+// select same file with different filenames
+/*
+ volk_32fc_s32fc_multiply_32fc(carre, (const gr_complex*)input_items[0],-1, CHUNK_SIZE);
+ volk_32fc_x2_add_32fc (carre, (const gr_complex*)input_items[1],carre,CHUNK_SIZE);
+ maxpos=0;
+ for (i=0;i<CHUNK_SIZE;i++)
+ {if (carre[i].real()!=0) {printf("%d: real !=0\n",i);maxpos=i;}
+ if (carre[i].imag()!=0) {printf("%d: imag !=0\n",i);maxpos=i;}
+ }
+if (maxpos!=0) {printf("Spoofing: sync error\n");fflush(stdout);}
+*/
+/////////// END CHECK FILES RUN AT THE SAME RATE
+
+ for (ch = 0; ch < input_items.size(); ch++)
+ { // identity: output the same as 1st channel input
+ in= (const gr_complex*)input_items[ch]; // all channels
+ volk_32fc_x2_multiply_32fc(carre, in, in, CHUNK_SIZE);
+ memcpy(bufin, carre, CHUNK_SIZE * sizeof(gr_complex));
+ plan->execute();
+ if (ch==0)
+ {memcpy(bufout0_sta,plan->get_outbuf(),KEEP_SIZE * sizeof(gr_complex)); // save FFT(CH0)
+ // volk_32fc_s32fc_multiply_32fc(bufout0_sta,bufout0_sta,{1000.0,0.0},KEEP_SIZE);
+ memcpy(bufout0_sto,&plan->get_outbuf()[CHUNK_SIZE-KEEP_SIZE-1],KEEP_SIZE * sizeof(gr_complex)); // save FFT(CH0)
+ // volk_32fc_s32fc_multiply_32fc(bufout0_sto,bufout0_sto,{1000.0,0.0},KEEP_SIZE);
+ }
+ if (ch==1)
+ {// volk_32fc_s32fc_multiply_32fc(bufout_tmpsta,plan->get_outbuf(),{1000.0,0.0},KEEP_SIZE);
+ // volk_32fc_s32fc_multiply_32fc(bufout_tmpsto,&plan->get_outbuf()[CHUNK_SIZE-KEEP_SIZE-1],{1000.0,0.0},KEEP_SIZE);
+ volk_32fc_x2_multiply_conjugate_32fc(bufout_sta,plan->get_outbuf(),bufout0_sta,KEEP_SIZE);
+ volk_32fc_x2_multiply_conjugate_32fc(bufout_sto,&plan->get_outbuf()[CHUNK_SIZE-KEEP_SIZE-1],bufout0_sto,KEEP_SIZE);
+ volk_32fc_x2_add_32fc( spoofing_average_mul, spoofing_average_mul, bufout_sta,KEEP_SIZE);
+ volk_32fc_x2_add_32fc(&spoofing_average_mul[KEEP_SIZE],&spoofing_average_mul[KEEP_SIZE],bufout_sto,KEEP_SIZE);
+
+ volk_32fc_x2_divide_32fc(bufout_sta,bufout0_sta,plan->get_outbuf(),KEEP_SIZE); // CH0/CH1
+ volk_32fc_x2_divide_32fc(bufout_sto,bufout0_sto,&plan->get_outbuf()[CHUNK_SIZE-KEEP_SIZE-1],KEEP_SIZE);
+// for (i=0;i<KEEP_SIZE;i++) {bufout_sta[i]=sqrt(bufout_sta[i]); bufout_sto[i]=sqrt(bufout_sto[i]);}
+ volk_32fc_x2_add_32fc( spoofing_average_div, spoofing_average_div, bufout_sta,KEEP_SIZE);
+ volk_32fc_x2_add_32fc(&spoofing_average_div[KEEP_SIZE],&spoofing_average_div[KEEP_SIZE],bufout_sto,KEEP_SIZE);
+ avg_index_++;
+ }
+/*
+ if ((first_time_==0)&&(avg_index_==Navg))
+ {//if (ch==input_items.size()-1) first_time_=1; // save both channels in file
+ sprintf(filenam,"/tmp/output_f0_%d.txt",num_file_);
+ fo=fopen(filenam,"w");
+ for (count=0;count<KEEP_SIZE;count++)
+ fprintf(fo,"%ld %f %f\n",ch,bufout0_sta[count].real(),bufout0_sta[count].imag());
+ for (count=0;count<KEEP_SIZE;count++)
+ fprintf(fo,"%ld %f %f\n",ch,bufout0_sto[count].real(),bufout0_sto[count].imag());
+ fclose(fo);
+ sprintf(filenam,"/tmp/output_favg%ld_%d.txt",ch,num_file_);
+ fo=fopen(filenam,"w");
+ for (count=0;count<KEEP_SIZE*2;count++)
+ fprintf(fo,"%ld %f %f\n",ch,spoofing_average[count].real(),spoofing_average[count].imag());
+ fclose(fo);
+ num_file_++;
+ printf("\n***********\n");
+ fo=fopen("/tmp/output_t1.txt","a");
+ for (count=0;count<CHUNK_SIZE;count++) fprintf(fo,"%ld %f %f\n",ch,in[count].real(),in[count].imag());
+ fclose(fo);
+ fo=fopen("/tmp/output_t2.txt","a");
+ for (count=0;count<CHUNK_SIZE;count++) fprintf(fo,"%ld %f %f\n",ch,carre[count].real(),carre[count].imag());
+ fclose(fo);
+ }
+*/
+ }
+ if (avg_index_==d_averages) // restart averaging
+ {//volk_32fc_magnitude_squared_32f(spoofing_mag,spoofing_average,KEEP_SIZE*2);
+// https://www.libvolk.org/doxygen/volk_32fc_index_max_16u.html
+// Finds and returns the index which contains the maximum magnitude for complex points in the given vector
+ volk_32fc_index_max_16u(&maxpos, &spoofing_average_mul[KEEP_SIZE-10],20); // max value where there should be no satellite
+ maxvallim=10.*norm(spoofing_average_mul[KEEP_SIZE-10+maxpos]); // abs(max)^2 TODO adjust x10 ?
+ count=0;
+#ifdef moycpl
+ meandiv={0.,0.};
+ weightcpl={0.,0.};
+#else
+ meanarg=0.;
+ meanabs=0.;
+#endif
+ do
+ {volk_32fc_index_max_16u(&maxpos, spoofing_average_mul, KEEP_SIZE*2);
+// printf("%hd:\tangle=%.3f\t-\t",maxpos,arg(spoofing_average_mul[maxpos])); // atan2(spoofing_average_mul[maxpos].imag(),spoofing_average_mul[maxpos].real()));
+// printf("div: mag=%.3f angle=%.3f\n", abs(spoofing_average_div[maxpos]),arg(spoofing_average_div[maxpos]));
+ maxval=norm(spoofing_average_mul[maxpos]);
+ spoofing_average_mul[maxpos]=gr_complex{0.,0.}; // on met ce bin a 0 et on itere sur ses voisins
+ if (maxpos>0)
+ spoofing_average_mul[maxpos-1]=gr_complex{0.,0.}; // on met ce bin a 0 et on itere sur ses voisins
+ if (maxpos>1)
+ spoofing_average_mul[maxpos-2]=gr_complex{0.,0.}; // on met ce bin a 0 et on itere sur ses voisins
+ if (maxpos<2*KEEP_SIZE-1)
+ spoofing_average_mul[maxpos+1]=gr_complex{0.,0.}; // on met ce bin a 0 et on itere sur ses voisins
+ if (maxpos<2*KEEP_SIZE-2)
+ spoofing_average_mul[maxpos+2]=gr_complex{0.,0.}; // on met ce bin a 0 et on itere sur ses voisins
+#ifdef moycpl
+ meandiv+=sqrt(spoofing_average_div[maxpos]); // racine des coefficient mis au carr'e
+ stddiv[count]=sqrt(spoofing_average_div[maxpos]);
+#else
+ meanarg+=(arg(spoofing_average_div[maxpos])/2);
+ meanabs+=sqrt(abs(spoofing_average_div[maxpos]));
+ stdarg[count]=(arg(spoofing_average_div[maxpos])/2);
+ stdabs[count]=sqrt(abs(spoofing_average_div[maxpos]));
+#endif
+ count++;
+ }
+ while ((maxval>maxvallim)&&(count<MAXSAT));
+ if (count>0)
+ {
+#ifdef moycpl
+ meandiv/=(float)(count);
+#else
+ meanabs/=(float)(count);
+ meanarg/=(float)(count);
+#endif
+ stdargres_=0.;
+#ifdef moycpl
+ for (i=0;i<count;i++) {stdargres_+=(arg(stddiv[i])-arg(meandiv))*(arg(stddiv[i])-arg(meandiv));} // ecart type sur les phases
+// for (i=0;i<count;i++) {printf("%d: %f\n",i,abs(stddiv[i]));} // affiche le module de tous les poids
+#else
+ for (i=0;i<count;i++) {stdargres_+=(stdarg[i]-meanarg)*(stdarg[i]-meanarg);}
+#endif
+ stdargres_/=(float)(count);
+ printf("%d:\tstdargs=%.5f\t",count,stdargres_);fflush(stdout);
+ if (stdargres_<=d_threshold) // spoofing
+ {
+// initial phase estimate, from S.Daneshmand, A.Jafarnia-Jahromi, A.Broumandan, and G.Lachapelle,
+// A low-complexity GPS anti-spoofing method using a multi-antenna array,” vol. 2, pp. 2, 2012.
+ volk_32fc_x2_multiply_conjugate_32fc(carre,(const gr_complex*)input_items[0],(const gr_complex*)input_items[1],CHUNK_SIZE);
+ integral={0.,0.};
+ for (ch = 0; ch < CHUNK_SIZE; ch++) integral+=carre[ch];
+ // integrale/=CHUNK_SIZE;
+ printf("1st estimate: %.5f\t",arg(integral));
+
+#ifndef moycpl
+ weightabs=0.;
+ weightarg=0.;
+#endif
+ c=0;
+ cnt=0;
+ do {
+#ifdef moycpl
+ if ((arg(stddiv[c])-arg(meandiv))<0.1)
+ {weightcpl+=stddiv[c];
+ cnt++;
+ }
+#else
+ if (abs(stdarg[c]-meanarg)<0.1)
+ {printf("%d ",c);
+ weightarg+=stdarg[c];
+ weightabs+=stdabs[c];
+ cnt++;
+ } // only keep spoofing SV
+#endif
+ c++;
+ } while ((c<count)&&(cnt<MAXKEEP));
+#ifdef moycpl
+ weightcpl/=(float)cnt;
+#else
+ weightarg/=(float)cnt;
+ weightabs/=(float)cnt;
+#endif
+#ifdef moycpl // should be -sqrt, -sqrt to subtract, but with \pi phase rotation remove the '-'
+ weight_=weightcpl; // .=(A1/A2)^2 WHY +pi ?
+#else
+ weight_={(weightabs)*cosf(weightarg),(weightabs)*sinf(weightarg)}; // .=(A1/A2)^2 WHY +pi ?
+#endif
+ if (abs(arg(weight_)-arg(integral))<0.7)
+ {printf("*");
+ weight_=-weight_; // add pi to phase => subtract weight
+ opposite=1;
+ }
+ else opposite=0;
+ }
+ printf("weightabs=%.2f,weightarg=%.2f",abs(weight_),arg(weight_));
+ }
+ memset(spoofing_average_mul,0,sizeof(gr_complex)*KEEP_SIZE*2); // start + stop
+ memset(spoofing_average_div,0,sizeof(gr_complex)*KEEP_SIZE*2); // start + stop
+ avg_index_=0;
+ }
+ if ((stdargres_>d_threshold)&&(spoofing_memory_==0)) // no spoofing
+ {
+ memcpy(output_items[0], input_items[0], noutput_items * sizeof(gr_complex));
+ printf("\n");
+ }
+ else
+ {if (stdargres_<=d_threshold)
+ {printf(" /!\\\n");
+ spoofing_memory_=MEMORY_LEN; // reinit memory
+ }
+ else
+ {printf(" \\!/\n");
+ spoofing_memory_--; // stdargres_ was > STD_THRESHOLD so spoofing_memory_>0 and --
+ }
+ volk_32fc_s32fc_multiply_32fc(carre,(const gr_complex*)input_items[1],weight_,CHUNK_SIZE); // -alpha*ant0
+ volk_32fc_x2_add_32fc((gr_complex*)output_items[0], (const gr_complex*)input_items[0], carre, CHUNK_SIZE);
+ if (opposite==1)
+ volk_32fc_s32fc_multiply_32fc((gr_complex*)output_items[0],(gr_complex*)output_items[0],-1,CHUNK_SIZE); // opposite
+ }
+// delete plan;
+ volk_free(carre);
+ return noutput_items;
+}
diff --git a/src/algorithms/signal_source/libs/spoofing_detection.h b/src/algorithms/signal_source/libs/spoofing_detection.h
new file mode 100644
index 000000000..6232fbf5d
--- /dev/null
+++ b/src/algorithms/signal_source/libs/spoofing_detection.h
@@ -0,0 +1,103 @@
+/*!
+ * \file
+ * \brief Interface of a GNU Radio block that sends a STOP message to the
+ * control queue right after a specific number of samples have passed through it.
+ * \author Javier Arribas, 2018. jarribas(at)cttc.es
+ * \author Carlos Aviles, 2010. carlos.avilesr(at)googlemail.com
+ *
+ * -------------------------------------------------------------------------
+ *
+ * Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors)
+ *
+ * GNSS-SDR is a software defined Global Navigation
+ * Satellite Systems receiver
+ *
+ * This file is part of GNSS-SDR.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * -------------------------------------------------------------------------
+ */
+
+
+#ifndef GNSS_SDR_GNSS_SDR_SPOOF_H
+#define GNSS_SDR_GNSS_SDR_SPOOF_H
+
+#include "concurrent_queue.h"
+#if GNURADIO_USES_STD_POINTERS
+#include <memory>
+#else
+#include <boost/shared_ptr.hpp>
+#endif
+#include <gnuradio/sync_block.h> // for sync_block
+#include <gnuradio/types.h> // for gr_vector_const_void_star
+#include <pmt/pmt.h>
+#include <cstddef> // for size_t
+#include <cstdint>
+#include <memory>
+
+#include <gnuradio/fft/fft.h>
+#include <gnuradio/fft/fft_shift.h>
+
+// #define CHUNK_SIZE (2048*8*2) // ~1023 MS/s/32768=30~Hz/bin
+#define CHUNK_SIZE (8192*64) // cf Matlab
+#define KEEP_SIZE (25000) // +/-50 kHz
+#define STD_THRESHOLD 0.05 // rad
+#define Navg 1 // FFT averages
+
+class Gnss_Spoofing_Protect;
+#if GNURADIO_USES_STD_POINTERS
+std::shared_ptr<Gnss_Spoofing_Protect> gnss_sdr_make_spoof(
+ float threshold,
+ int averages);
+
+#else
+boost::shared_ptr<Gnss_Spoofing_Protect> gnss_sdr_make_spoof(
+ float threshold,
+ int averages);
+
+#endif
+
+/*!
+ * \brief Implementation of a GNU Radio block that sends a STOP message to the
+ * control queue right after a specific number of samples have passed through it.
+ */
+class Gnss_Spoofing_Protect : public gr::sync_block
+{
+public:
+ int work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items);
+
+private:
+#if GNURADIO_USES_STD_POINTERS
+ friend std::shared_ptr<Gnss_Spoofing_Protect> gnss_sdr_make_spoof(
+ float threshold, int averages);
+#else
+ friend boost::shared_ptr<Gnss_Spoofing_Protect> gnss_sdr_make_spoof(
+ float threshold, int averages);
+#endif
+
+ Gnss_Spoofing_Protect(float threshold, int averages);
+
+ gr::fft::fft_complex* plan = new gr::fft::fft_complex(CHUNK_SIZE, true);
+ gr_complex spoofing_average_mul[KEEP_SIZE*2]; // 2* since sta followed by sto -> must fftshift to put 0 at center
+ gr_complex spoofing_average_div[KEEP_SIZE*2]; // 2* since sta followed by sto -> must fftshift to put 0 at center
+ gr_complex bufout0_sta[KEEP_SIZE];
+ gr_complex bufout0_sto[KEEP_SIZE];
+ gr_complex bufout_sta[KEEP_SIZE];
+ gr_complex bufout_sto[KEEP_SIZE];
+// gr_complex bufout_tmpsta[KEEP_SIZE];
+// gr_complex bufout_tmpsto[KEEP_SIZE];
+ gr_complex processed_output[CHUNK_SIZE];
+ gr_complex weight_;
+ float stdargres_;
+ int avg_index_;
+ int num_file_;
+ int spoofing_memory_;
+ float d_threshold;
+ int d_averages;
+ int first_time_;
+};
+
+#endif // GNSS_SDR_GNSS_SDR_SPOOF_H
--
2.41.0