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Radiosonde RX now understands Meteomodem's M10 correctly

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This commit is contained in:
furrtek 2017-10-27 18:54:50 +02:00
parent 6e7b2c751f
commit d47f292d3a
11 changed files with 157 additions and 47 deletions
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13
firmware/baseband/proc_sonde.hpp
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@ -28,8 +28,8 @@
* 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
* _______________|______/'\______
* -C A B C
*
* A is the DC spike at 0Hz
* B is the FSK signal shifted right at 9600Hz
@ -40,7 +40,7 @@
* ______________/'\______________
* -C D C
*
* A should have been filtered off ?
* Anything unwanted (like A) should have been filtered off
* D is B around 0Hz now
*
* Then the clock_recovery function should be happy :)
@ -113,18 +113,17 @@ private:
dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
dsp::matched_filter::MatchedFilter mf { baseband::ais::square_taps_38k4_1t_p, 2 };
// AIS: 19200, 9600
clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery_fsk_4800 {
19200, 4800, { 0.0555f },
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_4800_M10.execute(sliced_symbol);
}
};
PacketBuilder<BitPattern, NeverMatch, FixedLength> packet_builder_fsk_4800_M10 {
{ 0b11001100110011001010011001001100, 32, 1 },
{ 0b00110011001100110101100110110011, 32, 1 },
{ },
{ 50 }, // { 102 * 8 },
{ 102 * 8 },
[this](const baseband::Packet& packet) {
const SondePacketMessage message { sonde::Packet::Type::M10, packet };
shared_memory.application_queue.push(message);