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This commit is contained in:
jLynx
2023-05-19 08:16:05 +12:00
committed by GitHub
parent 7aca7ce74d
commit 033c4e9a5b
599 changed files with 70746 additions and 66896 deletions
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201
firmware/baseband/proc_sonde.hpp
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@@ -24,49 +24,49 @@
/* Notes to self (or others, welcome !):
* Sharebrained wrote in matched_filter.hpp that taps should be those of a complex low-pass filter combined with a complex sinusoid, so
* that the filter shifts the spectrum where we want (signal of interest around 0Hz).
*
*
* In this baseband processor, after decim_0 and decim_1, the signal ends up being sampled at 38400Hz (2457600 / 8 / 8)
* Since the applied shift in ui_sonde.cpp is -fs/4 = -2457600/4 = -614400Hz to avoid the DC spike, the FSK signal ends up being
* shifted by 614400 / 8 / 8 = 9600Hz. So decim_1_out should look like this:
*
*
* _______________|______/'\______
* -C A B C
*
*
* A is the DC spike at 0Hz
* B is the FSK signal shifted right at 9600Hz
* C is the bandwidth edge at 19200Hz
*
*
* Taps should be computed to shift the whole spectrum by -9600Hz ("left") so that it looks like this:
*
*
* ______________/'\______________
* -C D C
*
*
* Anything unwanted (like A) should have been filtered off
* D is B around 0Hz now
*
*
* Then the clock_recovery function should be happy :)
*
*
* Mathworks.com says:
* In the case of a single-rate FIR design, we simply multiply each set of coefficients by (aka 'heterodyne with') a complex exponential.
*
*
* Can SciPy's remez function be used for this ? See tools/firtest.py
* GnuRadio's firdes only outputs an odd number of taps
*
*
* ---------------------------------------------------------------------
*
*
* Looking at the AIS baseband processor:
*
*
* Copied everything necessary to get decim_1_out (so same 8 * 8 = 64 decimation factor)
* The samplerate is also the same (2457600)
* After the matching filter, the data is decimated by 2 so the final samplerate for clock_recovery is 38400 / 2 = 19200Hz.
* Like here, the shift used is fs/4, so decim_1_out should be looking similar.
* The AIS signal deviates by 2400 (4800Hz signal width), the symbol rate is 9600.
*
*
* The matched filter's input samplerate is 38400Hz, to get a 9600Hz shift it must use 4 taps ?
* To obtain unity gain, the sinusoid length must be / by the number of taps ?
*
*
* See ais_baseband.hpp
*
*
* */
#ifndef __PROC_SONDE_H__
@@ -97,107 +97,104 @@
#include <cstddef>
#include <bitset>
#define BEEP_MIN_DURATION 60
#define BEEP_DURATION_RANGE 100
#define BEEP_BASE_FREQ 200
#define RSSI_CEILING 1000
#define PROPORTIONAL_BEEP_THRES 0.8
#define RSSI_PITCH_WEIGHT 0.5
#define AUDIO_SAMPLE_RATE 24000
#define BEEP_MIN_DURATION 60
#define BEEP_DURATION_RANGE 100
#define BEEP_BASE_FREQ 200
#define RSSI_CEILING 1000
#define PROPORTIONAL_BEEP_THRES 0.8
#define RSSI_PITCH_WEIGHT 0.5
#define AUDIO_SAMPLE_RATE 24000
class SondeProcessor : public BasebandProcessor {
public:
SondeProcessor();
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const msg);
private:
public:
SondeProcessor();
static constexpr size_t baseband_fs = 2457600;
void execute(const buffer_c8_t& buffer) override;
void on_message(const Message* const msg);
std::array<int16_t, 32> audio { };
private:
static constexpr size_t baseband_fs = 2457600;
const buffer_s16_t audio_buffer {
(int16_t*) audio.data(),
sizeof(audio) / sizeof(int16_t)
};
std::array<int16_t, 32> audio{};
AudioOutput audio_output { };
const buffer_s16_t audio_buffer{
(int16_t*)audio.data(),
sizeof(audio) / sizeof(int16_t)};
bool beep_play { false };
bool silence_play { false };
bool pitch_rssi_enabled { false };
AudioOutput audio_output{};
uint32_t last_rssi { 0 };
bool beep_play{false};
bool silence_play{false};
bool pitch_rssi_enabled{false};
ToneGen tone_gen { };
uint32_t last_rssi{0};
BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
RSSIThread rssi_thread { NORMALPRIO + 10 };
ToneGen tone_gen{};
std::array<complex16_t, 512> dst { };
const buffer_c16_t dst_buffer {
dst.data(),
dst.size()
};
BasebandThread baseband_thread{baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive};
RSSIThread rssi_thread{NORMALPRIO + 10};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::matched_filter::MatchedFilter mf { baseband::ais::square_taps_38k4_1t_p, 2 };
std::array<complex16_t, 512> dst{};
const buffer_c16_t dst_buffer{
dst.data(),
dst.size()};
// Actually 4800bits/s but the Manchester coding doubles the symbol rate
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery_fsk_9600 {
19200, 9600, { 0.0555f },
[this](const float raw_symbol) {
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
this->packet_builder_fsk_9600_Meteomodem.execute(sliced_symbol);
}
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_fsk_9600_Meteomodem {
{ 0b00110011001100110101100110110011, 32, 1 },
{ },
{ 88 * 2 * 8 },
[this](const baseband::Packet& packet) {
const SondePacketMessage message { sonde::Packet::Type::Meteomodem_unknown, packet };
shared_memory.application_queue.push(message);
}
};
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery_fsk_4800 {
19200, 4800, { 0.0555f },
[this](const float raw_symbol) {
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
this->packet_builder_fsk_4800_Vaisala.execute(sliced_symbol);
}
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_fsk_4800_Vaisala {
{ 0b00001000011011010101001110001000, 32, 1 }, //euquiq Header detects 4 of 8 bytes 0x10B6CA11 /this is in raw format) (these bits are not passed at the beginning of packet)
//{ 0b0000100001101101010100111000100001000100011010010100100000011111, 64, 1 }, //euquiq whole header detection would be 8 bytes.
{ },
{ 320 * 8 },
[this](const baseband::Packet& packet) {
const SondePacketMessage message { sonde::Packet::Type::Vaisala_RS41_SG, packet };
shared_memory.application_queue.push(message);
}
};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0{};
dsp::decimate::FIRC16xR16x32Decim8 decim_1{};
dsp::matched_filter::MatchedFilter mf{baseband::ais::square_taps_38k4_1t_p, 2};
void play_beep();
void stop_beep();
/**
* Used for filling the audio buffer with the waveform
* generated by the ToneGen class:
*
*/
void generate_beep();
// Actually 4800bits/s but the Manchester coding doubles the symbol rate
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery_fsk_9600{
19200,
9600,
{0.0555f},
[this](const float raw_symbol) {
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
this->packet_builder_fsk_9600_Meteomodem.execute(sliced_symbol);
}};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_fsk_9600_Meteomodem{
{0b00110011001100110101100110110011, 32, 1},
{},
{88 * 2 * 8},
[this](const baseband::Packet& packet) {
const SondePacketMessage message{sonde::Packet::Type::Meteomodem_unknown, packet};
shared_memory.application_queue.push(message);
}};
/**
* Used for filling the audio buffer with silence:
*/
void generate_silence();
void pitch_rssi_config(const PitchRSSIConfigureMessage& message);
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery_fsk_4800{
19200,
4800,
{0.0555f},
[this](const float raw_symbol) {
const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
this->packet_builder_fsk_4800_Vaisala.execute(sliced_symbol);
}};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_fsk_4800_Vaisala{
{0b00001000011011010101001110001000, 32, 1}, // euquiq Header detects 4 of 8 bytes 0x10B6CA11 /this is in raw format) (these bits are not passed at the beginning of packet)
//{ 0b0000100001101101010100111000100001000100011010010100100000011111, 64, 1 }, //euquiq whole header detection would be 8 bytes.
{},
{320 * 8},
[this](const baseband::Packet& packet) {
const SondePacketMessage message{sonde::Packet::Type::Vaisala_RS41_SG, packet};
shared_memory.application_queue.push(message);
}};
void play_beep();
void stop_beep();
/**
* Used for filling the audio buffer with the waveform
* generated by the ToneGen class:
*
*/
void generate_beep();
/**
* Used for filling the audio buffer with silence:
*/
void generate_silence();
void pitch_rssi_config(const PitchRSSIConfigureMessage& message);
};
#endif/*__PROC_ERT_H__*/
#endif /*__PROC_ERT_H__*/