Commit graph

458 commits

Author SHA1 Message Date
Malcolm Robb 43c648448f Added some other peoples commit modificatons
Added dtiller's --quiet and --ppm modifications
Added terribl's squawk on interactive modifications

Removed up some unused or un-needed variables
2013-04-08 16:42:27 +01:00
Malcolm Robb d3662bba80 Implemented Beast Binary output 2013-04-07 16:22:02 +01:00
antirez ff0fe38722 Two typos fixed in gmap.html. 2013-02-04 23:09:21 +01:00
antirez c991d658c6 gmap.html: update plane flight field when new data is received. 2013-02-03 23:20:29 +01:00
antirez acc702d9ac Fake version info removed from gmap.html. 2013-02-02 16:32:42 +01:00
antirez 9d55d5edd7 gmap.html: no rotation jumps when selecting / deselecting planes. 2013-02-02 16:32:00 +01:00
antirez 3307261546 CPR decoding: southern hemisphere coords are now handled correctly. 2013-02-02 14:40:58 +01:00
antirez 13596ba3dd A few bugs fixed in debug.html. 2013-01-27 21:42:40 +01:00
antirez e9e07e0778 Improved Google map interace: select planes and see details. 2013-01-27 01:37:05 +01:00
antirez 27e3743d87 Remove stale aircrafts when --interactive is not enabled. 2013-01-27 01:25:22 +01:00
antirez 977493cf63 Strong preamble detection even with --aggressive.
To try to decode messages with a fundamentally flawed preamble is mostly
a useless waste of CPU time.

The new aggressive mode still detects a sensible percentage of
additional messages because of the error tolerance and two-bits fixes
but does not waste your CPU time.
2013-01-26 13:03:24 +01:00
antirez 184953ff92 Phase correction fixed, code reshaped to apply more corrections.
The phase correction was applied only to a subset of bits! Because of an
offset error.

The detection code layout was modified a bit to make it simpler to
implement more corrections in the future. However only phase correction
is performed currently. Slope correction, or to compensate for the cycloid
effect are two possible improvements.
2013-01-26 12:58:08 +01:00
antirez 11d8db0d38 Properly initialize ICAO cached addresses hash table. 2013-01-26 01:15:24 +01:00
antirez c2e79d4555 Many small improvements (see full commit message).
* Better preamble detection to skip most of the messages we'll likely
  not be able to decode.

* A Phase correction algorithm that improves the recognition compared
  to the previous algorithm used.

* Javascript output in debug mode, and a debug.html file that can be
  used in order to see graphically undecoded samples.

* Ability to detect cross-read messages, that are, messages that happen
  to start and end across two different reads from the device or file.

* A few bugx fixed.

* README improved.
2013-01-26 01:08:13 +01:00
antirez 9086290b03 SBS-1: Code style adapted to code base. 2013-01-20 00:17:58 +01:00
Kemal Hadimli 071a021f20 New feature: Output in SBS format 2013-01-19 22:44:11 +01:00
antirez 2fe188286e Do not modify the packet when AP gets decoded. 2013-01-19 18:45:00 +01:00
antirez c9bb48675c Squawk extraction fixed. 2013-01-19 18:44:54 +01:00
antirez b4805ea7d4 Two important fixes to CPR decoding: wrong cast and more precise timing.
This commit address two issues with the implementation of CPR decoding:

Fix #1: The two functions N() and DLon() used to have the latitude
parameter as an integer (!), basically truncating the fractional part
before calling the NL() function to perform the lookup.

This resulted into random strange movements of aircrafts, especially
jumps or shifted positions.

Fix #2: Use milliseconds for CPR odd/even timestamps. Dump1090 already
tried to use the most recent packet received among the odd and even
packets currently available, however to do this correctly millisecond
resolution should be used, otherwise many times the odd and even packet
appear to have the same time in seconds and we don't always use the
latest received.
2013-01-18 23:05:08 +01:00
antirez 03759a3eb0 Google map view enhanced: color by altitude and more. 2013-01-16 20:25:28 +01:00
antirez 21fc9de47a HTTP keep-alive fixed. Network debugging capabilities. 2013-01-16 20:07:35 +01:00
antirez e40e55bfe0 Less buggy network requests parser. 2013-01-16 00:40:47 +01:00
antirez dc91712741 Aggressive mode implemented. 2013-01-15 22:37:47 +01:00
antirez 0bf65d8646 Better error handling for network clients. 2013-01-15 00:35:21 +01:00
antirez e1d3724271 Regression fixed: set client socket non-blocking. 2013-01-15 00:24:19 +01:00
antirez 42eb990685 HTTP: Set clen correctly when serving gmap.html. 2013-01-14 20:25:11 +01:00
antirez a583615b66 Initial HTTP support with planes animated using google map. 2013-01-14 15:13:43 +01:00
antirez 4203b9caf6 Minor README improvements. 2013-01-12 20:28:24 +01:00
antirez b10c8dab35 CPR decoding fixed. 2013-01-12 18:18:23 +01:00
antirez f3a705f57e README -> README.md 2013-01-12 11:58:25 +01:00
antirez ddb1aa2209 README improved with more antennas info. 2013-01-12 11:46:53 +01:00
antirez 0ce746dc5f Ability to receive traffic from network. 2013-01-12 11:46:32 +01:00
antirez b5ff48e5f5 Network server sending raw data to clients. 2013-01-10 20:58:13 +01:00
antirez 539039f037 Set heading to 0 when speed is 0. 2013-01-10 19:03:41 +01:00
antirez af4964d72f With --raw fflush() at every output to avoid delays. 2013-01-10 19:01:28 +01:00
antirez 9c8ad1c6b7 More stuff on .gitignore. 2013-01-10 19:00:07 +01:00
antirez b6907f400a CPR position decoding. Track calculation from velocity components. 2013-01-09 22:51:29 +01:00
antirez ec1f34f572 Fix for --metric 2013-01-08 20:02:58 +01:00
antirez 32fe8d8d69 New --metric option to use meters and km/h in --interactive. 2013-01-08 19:46:50 +01:00
antirez f231c7adb2 Remove idle aircrafts in interactive mode. 2013-01-08 19:25:28 +01:00
antirez 3f47bb6f47 Initialize aircraft speed in interactive mode.
The effect of this bug was random speeds displayed with --interactive.
2013-01-08 19:23:51 +01:00
antirez 1576b61af5 Minor aesthetic change to interactive mode. 2013-01-07 01:50:34 +01:00
antirez 840a005d16 Interactive mode with --ifile: play at natural speed. 2013-01-07 01:47:39 +01:00
antirez 69ae2491a5 New AP brute forcing algorithm.
The old approach was to loop over a small circular buffer of recently
seen addresses recomputing the CRC every time: this prevented the use of
a big cache, and 20 entries was too small in case of high traffic and
big range antennas.

@prog on ##rtlsdr suggested to use an alternative algorithm where
instead we compute the CRC of the message, and xor it to obtain the
address, that is later checked in our list of recently seen addresses.
This is a lot better and allows for bigger tables in O(1) lookup time.

I used this idea to implement a larger 1024 elements table. Instead of
writing a proper hash table I used the fact we are just dealing with a
cache, so I just hash the ICAO addess and overwrite the old entry at
that idex with the address-timestamp pair, not caring about collisions.

The bigger table makes a huge difference:
In a test vector of 113 seconds recording with 76 simultaneous aircrafts
the new algorithm detected around 10k more messages (!).
2013-01-07 01:15:29 +01:00
antirez fed415b699 Show 16 bit magnitude value with --debug. 2013-01-07 00:29:35 +01:00
antirez 0a7c5c2e2e Threads locking model fixed (reliable --ifile). 2013-01-06 22:56:32 +01:00
antirez c653e0e95d Added a new --onlyaddr option to just output ICAO addresses. 2013-01-06 17:09:31 +01:00
antirez b3945d1b4f Use 16 bit for the magnitude vector to improve sensitivity.
As @keenerd noted on ##rtlsdr, using an 8 bit magnitude vector is not
enough in order to distinguish every different I/Q pair.

With this commit a few more messages with good CRC are detected.
2013-01-06 16:54:54 +01:00
antirez 417cab5fda Improved message detection and --stats option.
The demodulation algorithm now only skips the current message if the
CRC is valid, this improves the amount of messages detected with good
CRC by ~ 4% since sometimes we are just a few samples out of sync.

This also improves the amount of messages that can be fixed.

The --stats option was added in order to better evaluate how the
algorithm performs on the same input after some change. So if you run
the program with both --ifile and --stats no Mode S message is logged
at all, but at the end of the processing the program shows you the
amount of messages decoded with good, bad crc, bit corrections, valid
preambles and so forth.
2013-01-06 15:13:40 +01:00
antirez 3833673f3f Git ignore the right executable name. 2013-01-05 21:42:26 +01:00