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Fix language in README.

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Nick Foster 2012-06-18 18:34:58 -07:00
parent f6161f7c3b
commit 8b747e23da
1 changed files with 17 additions and 16 deletions
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README
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@ -44,9 +44,10 @@ This receiver listens to the 1090MHz downlink channel; interrogation
requests at 1030MHz are not received or decoded by this program.
Automatic Dependent Surveillance-Broadcast (ADS-B) is a communication
protocol using the Extended Mode S transport layer. There are other
implementations (VDL Mode 2 and UAT, for instance) but Mode S remains
the primary ADS-B transport for commercial use. The protocol is:
protocol using the Extended Squitter capability of the Mode S transport
layer. There are other implementations (VDL Mode 2 and UAT, for
instance) but Mode S remains the primary ADS-B transport for commercial
use. The protocol is:
* Automatic: it requires no pilot input
* Dependent: it is dependent on altimeter, GPS, and other aircraft
@ -66,10 +67,9 @@ a mandate arriving in 2020 via the FAA's "NextGen" program.
The receiver uhd_modes.py is written for use with Ettus Research USRP
devices, although the "RTLSDR" receivers are also supported via the
Osmocom driver. In addition, any receiver which outputs complex
samples at at least 2Msps should work via the file input or UDP input
options, or by means of a Gnuradio interface. Multiple output formats
are supported:
Osmocom driver. In theory, any receiver which outputs complex samples at
at least 2Msps should work via the file input or UDP input options, or
by means of a Gnuradio interface. Multiple output formats are supported:
* Raw (or minimally processed) output of packet data
* Parsed text
@ -83,9 +83,9 @@ are supported:
Most of the common ADS-B reports are fully decoded per specification.
Those that are not are generally ones which are not commonly used.
In particular, should you receive a large number of reports which result
in "not implemented" or "No handler" messages, please use the -w option
to save raw data and forward it to the author. To save time, note that
Should you receive a large number of reports which result in
"not implemented" or "No handler" messages, please use the -w option to
save raw data and forward it to the author. To save time, note that
receiving a small number of spurious reports is expected; false reports
can be excluded by looking for multiple reports from the same aircraft
(i.e., the same ICAO 6-digit hexadecimal number).
@ -121,18 +121,19 @@ install it on your system, generally in /usr/local/bin.
========================================================================
USAGE
The main application is apps/uhd_modes.py. For a complete list of
options, run:
The main application is uhd_modes.py. For a complete list of options,
run:
$ apps/uhd_modes.py --help
$ uhd_modes.py --help
For use with Ettus UHD-compatible devices, the defaults should suffice
to receive reports and print to the screen. Use the -d option to look
for an RTLSDR-type dongle using the osmosdr driver.
In particular, the --location option should be used to set the receiving
location's GPS coordinates. This provides better decoding of position
reports and enables range and bearing calculations.
In particular, the --location option can be used to set the receiving
location's GPS coordinates. This enables range and bearing calculations
in the printed display as well as range rings in the Google Earth
interface.
========================================================================
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