kopia lustrzana https://github.com/N0BOY/FT8CN
70 wiersze
2.6 KiB
C
70 wiersze
2.6 KiB
C
//
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// Created by jmsmf on 2022/4/24.
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//
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//
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#include "ft8/decode.h"
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#include "monitor_opr.h"
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#include "ft8/constants.h"
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#include <time.h>
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//const int kMin_score = 10; // 候选人的最低同步分数阈值。Minimum sync score threshold for candidates
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const int kMax_candidates = 120;//最大候选人数量
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const int kMax_decoded_messages = 100;
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//const int kMax_decoded_messages = 50;
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const int kLDPC_iterations = 20;//LDPC（低密度奇偶校验）的迭代次数，数值越大，精度越高，速度越慢
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const int deep_kLDPC_iterations = 200;//LDPC（低密度奇偶校验）的迭代次数
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const int fast_kLDPC_iterations = 20;//LDPC（低密度奇偶校验）的迭代次数
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typedef struct {
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long long utcTime;//UTC时间
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int num_samples;//采样率
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int num_candidates;
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int num_decoded;
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message_t decoded[kMax_decoded_messages];//kMax_decoded_messages=50
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// 哈希表指针列表（指针数组）
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message_t *decoded_hashtable[kMax_decoded_messages];
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// Find top candidates by Costas sync score and localize them in time and frequency
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// 从科斯塔斯阵列（Costas）寻找最佳候选，并在时间和频率上对其进行本地化。候选数组最大120个
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// candidate_t定义在decode.h
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candidate_t candidate_list[kMax_candidates];//kMax_candidates=120
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monitor_t mon;
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monitor_config_t mon_cfg;
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uint8_t a91[FTX_LDPC_K_BYTES];//用于生成减法代码的数据
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int kLDPC_iterations;//ldpc 迭代次数，数值越大，精度越高，速度越慢：20或100
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} decoder_t;
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typedef struct {
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int64_t utcTime;//消息的UTC时间
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bool isValid;//是否为有效消息
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int snr;//信噪比
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candidate_t candidate;//消息的原始信号数据
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float time_sec;//时间偏移值
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float freq_hz;//频率偏移值
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message_t message;//解码后的消息
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decode_status_t status;
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} ft8_message;
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static const int kFreq_osr = 2; // 频率过采样率。Frequency oversampling rate (bin subdivision)
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static const int kTime_osr = 2; // 时间过采样率。Time oversampling rate (symbol subdivision)
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//把信号FFT,在解码decoder中减去信号
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void signalToFFT(decoder_t *decoder,float signal[], int sample_rate);
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//初始化解码器所需要的参数，最后通过指针的方式传递给java
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void *init_decoder(int64_t utcTime, int sample_rate, int num_samples, bool is_ft8);
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void delete_decoder(decoder_t *decoder);
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void decoder_monitor_press(float signal[], decoder_t *decoder);
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int decoder_ft8_find_sync(decoder_t *decoder);
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ft8_message decoder_ft8_analysis(int idx, decoder_t *decoder);
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void decoder_ft8_reset(decoder_t *decoder,long utcTime,int num_samples);
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void recode(int a174[],int a79[]);
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