Merge branch 'master' into qtapp
Conflicts: CMakeLists.txt lib/air_modes_preamble.cc
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commit
70dfb4f821
@ -22,7 +22,9 @@
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# Project setup
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########################################################################
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cmake_minimum_required(VERSION 2.6)
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project(gr-air-modes CXX)
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project(gr-gr-air-modes CXX)
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set(gr-gr-air-modes_VERSION_MAJOR 0)
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set(gr-gr-air-modes_VERSION_MINOR 0)
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enable_testing()
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#select the release build type by default to get optimization flags
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@ -29,6 +29,8 @@ add_library(air_modes SHARED
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)
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target_link_libraries(air_modes ${Boost_LIBRARIES} ${GRUEL_LIBRARIES} ${GNURADIO_CORE_LIBRARIES})
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set_target_properties(air_modes PROPERTIES DEFINE_SYMBOL "AIR_MODES_EXPORTS")
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set_target_properties(air_modes PROPERTIES SOVERSION "${gr-gr-air-modes_VERSION_MAJOR}")
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set_target_properties(air_modes PROPERTIES VERSION "${gr-gr-air-modes_VERSION_MAJOR}.${gr-gr-air-modes_VERSION_MINOR}")
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########################################################################
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# Install built library files
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@ -53,7 +53,7 @@ air_modes_preamble::air_modes_preamble(int channel_rate, float threshold_db) :
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str << name() << unique_id();
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d_me = pmt::pmt_string_to_symbol(str.str());
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d_key = pmt::pmt_string_to_symbol("preamble_found");
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set_history(d_check_width);
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set_history(d_samples_per_symbol);
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}
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static void integrate_and_dump(float *out, const float *in, int chips, int samps_per_chip) {
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@ -101,7 +101,13 @@ int air_modes_preamble::general_work(int noutput_items,
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{
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const float *in = (const float *) input_items[0];
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const float *inavg = (const float *) input_items[1];
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const int ninputs = std::min(ninput_items[0], ninput_items[1]); //just in case
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int mininputs = std::min(ninput_items[0], ninput_items[1]); //they should be matched but let's be safe
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//round number of input samples down to nearest d_samples_per_chip
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//we also subtract off d_samples_per_chip to allow the bit center finder some leeway
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const int ninputs = std::max(mininputs - (mininputs % d_samples_per_chip) - d_samples_per_chip, 0);
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if (ninputs <= 0) { consume_each(0); return 0; }
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float *out = (float *) output_items[0];
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if(0) std::cout << "Preamble called with " << ninputs << " samples" << std::endl;
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@ -132,15 +138,18 @@ int air_modes_preamble::general_work(int noutput_items,
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//get a more accurate bit center by finding the correlation peak across all four preamble bits
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bool late, early;
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int how_late = 0;
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do {
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double now_corr = correlate_preamble(in+i, d_samples_per_chip);
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double late_corr = correlate_preamble(in+i+1, d_samples_per_chip);
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double early_corr = correlate_preamble(in+i-1, d_samples_per_chip);
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late = (late_corr > now_corr);
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//early = (early_corr > now_corr);
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if(late) i++;
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if(late) { i++; how_late++; }
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//if(early && i>0) { std::cout << "EARLY " << i << std::endl; i--; }
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} while(late);// xor early);
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} while(late and how_late < d_samples_per_chip);// xor early);
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if(0) std::cout << "We were " << how_late << " samples late" << std::endl;
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//now check to see that the non-peak symbols in the preamble
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//are below the peaks by threshold dB
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@ -160,6 +169,7 @@ int air_modes_preamble::general_work(int noutput_items,
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//be sure we've got enough room in the input buffer to copy out a whole packet
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if(ninputs-i < 240*d_samples_per_chip) {
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consume_each(std::max(i-1,0));
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if(0) std::cout << "Preamble consumed " << std::max(i-1,0) << ", returned 0 (no room)" << std::endl;
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return 0;
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}
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@ -190,7 +200,7 @@ int air_modes_preamble::general_work(int noutput_items,
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//std::cout << "PREAMBLE" << std::endl;
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//produce only one output per work call -- TODO this should probably change
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if(0) std::cout << "Preamble consumed " << i+240*d_samples_per_chip << ", returned 240" << std::endl;
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if(0) std::cout << "Preamble consumed " << i+240*d_samples_per_chip << "with i=" << i << ", returned 240" << std::endl;
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consume_each(i+240*d_samples_per_chip);
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return 240;
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}
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@ -180,7 +180,7 @@ class output_print(air_modes.parse):
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retstr = "Type 17 BDS6,2 (emergency) from %x type %s" % (icao24, emerg_str)
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else:
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retstr = "Type 17 subtype %i from %x not implemented" % (subtype, icao24)
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retstr = "Type 17 with FTC=%i from %x not implemented" % (data["ftc"], icao24)
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return retstr
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