Total number of airborne CPR messages received
Global positions that were rejected because they were inconsistent
Global positions successfully derived
Global positions that were rejected because they exceeded the receiver max range
Global position attempts skipped because we did not have the right data (e.g. even/odd messages crossed a zone boundary)
Global positions that were rejected because they failed the inter-position speed check
Local positions found relative to a previous aircraft position
Local (relative) positions successfully found
Local positions not used because they exceeded the receiver max range or fell into the ambiguous part of the receiver range
Local (relative) positions not used because we did not have the right data
Local positions not used because they failed the inter-position speed check
Total number of surface CPR messages received
Milliseconds spent doing network I/O, processing received network messages, and periodic tasks.
Milliseconds spent doing demodulation and decoding in response to data from a SDR dongle.
Milliseconds spent reading sample data over USB from a SDR dongle.
The number of valid Mode S messages accepted from a local SDR with N-bit errors corrected.
Number of Mode A / C messages decoded.
Number of Mode S preambles received. This is not the number of valid messages!
Calculated receiver noise floor level.
Peak signal power of a successfully received message, in dBFS; always negative.
Number of sample blocks dropped before processing. A non-zero value means CPU overload.
Number of sample blocks processed.
Mean signal power of successfully received messages, in dBFS; always negative.
Number of messages received that had a signal power above -3 dBFS.
Number of Mode S messages which looked like they might be valid but we didn't recognize the ICAO address and it was one of the message types where we can't be sure it's valid in this case.
Maximum range in nautical miles
Total number of messages accepted by readsb from any source
Number of valid Mode S messages accepted over the network with N-bit errors corrected.
Number of Mode A / C messages received.
Number of Mode S messages received.
Tracks consisting of a position derived from MLAT
Total tracks (aircraft) created. Each track represents a unique aircraft and persists for up to 5 minutes.
Tracks consisting of only a single message. These are usually due to message decoding errors that produce a bad aircraft address.
Tracks consisting of a position.