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Select only the best sections of the FFT output.

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Skip the lowest 1/8 of the band, the middle 1/4 of the band, and the highest 1/8 of the band.
This provides full coverage of the selected frequency range because the hopping pattern was designed with this in mind.
This commit is contained in:
Michael Ossmann
2017-02-04 10:43:33 -07:00
parent 93201702d6
commit 3ad5113201
1 changed files with 13 additions and 3 deletions
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16
host/hackrf-tools/src/hackrf_sweep.c
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@ -244,11 +244,21 @@ int rx_callback(hackrf_transfer* transfer) {
strftime(time_str, 50, "%Y-%m-%d, %H:%M:%S", fft_time); strftime(time_str, 50, "%Y-%m-%d, %H:%M:%S", fft_time);
printf("%s, %" PRIu64 ", %" PRIu64 ", %.2f, %d", printf("%s, %" PRIu64 ", %" PRIu64 ", %.2f, %d",
time_str, time_str,
(uint64_t)((FREQ_ONE_MHZ*frequency)-(DEFAULT_SAMPLE_RATE_HZ/2)), (uint64_t)((FREQ_ONE_MHZ*frequency)-((DEFAULT_SAMPLE_RATE_HZ*3)/8)),
(uint64_t)((FREQ_ONE_MHZ*frequency)+(DEFAULT_SAMPLE_RATE_HZ/2)), (uint64_t)((FREQ_ONE_MHZ*frequency)-(DEFAULT_SAMPLE_RATE_HZ/8)),
(float)STEP_SIZE_IN_HZ, (float)STEP_SIZE_IN_HZ,
FFT_SIZE); FFT_SIZE);
for(i=0; i < fftSize; i++) { for(i=fftSize/8; (fftSize*3)/8 > i; i++) {
printf(", %.2f", pwr[i]);
}
printf("\n");
printf("%s, %" PRIu64 ", %" PRIu64 ", %.2f, %d",
time_str,
(uint64_t)((FREQ_ONE_MHZ*frequency)+(DEFAULT_SAMPLE_RATE_HZ/8)),
(uint64_t)((FREQ_ONE_MHZ*frequency)+((DEFAULT_SAMPLE_RATE_HZ*3)/8)),
(float)STEP_SIZE_IN_HZ,
FFT_SIZE);
for(i=(fftSize*5)/8; (fftSize*7)/8 > i; i++) {
printf(", %.2f", pwr[i]); printf(", %.2f", pwr[i]);
} }
printf("\n"); printf("\n");