From 857c56ca7be2d0ba2c865270d1bd86d98213ed43 Mon Sep 17 00:00:00 2001 From: henry1952 <49370322+henry1952@users.noreply.github.com> Date: Sat, 13 Apr 2019 09:41:21 +0200 Subject: [PATCH] Update README-json.md --- README-json.md | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/README-json.md b/README-json.md index e12891e..3a5e10b 100644 --- a/README-json.md +++ b/README-json.md @@ -37,9 +37,10 @@ This file contains dump1090's list of recently seen aircraft. The keys are: * now: the time this file was generated, in seconds since Jan 1 1970 00:00:00 GMT (the Unix epoch). * messages: the total number of Mode S messages processed since dump1090 started. * aircraft: an array of JSON objects, one per known aircraft. Each aircraft has the following keys. Keys will be omitted if data is not available. - * hex: the 24-bit ICAO identifier of the aircraft, as 6 hex digits. The identifier may start with '~', this means that the address is a non-ICAO address (e.g. from TIS-B). - * type: - * flight: the flight name / callsign + * hex: the 24-bit ICAO identifier of the aircraft, as 6 hex digits. + The identifier may start with '~', this means that the address is a non-ICAO address (e.g. from TIS-B). + * type: type of the modeS address e.g. ADS-B, ADR-R, TIS-B + * flight: callsign, the flight name or aircraft registration as 8 chars (2.2.8.2.6) * alt_baro: the aircraft barometric altitude in either feet or meters * alt_geom: geometric (GNSS / INS) altitude in either feet or meters * gs: ground speed in knots @@ -53,30 +54,36 @@ This file contains dump1090's list of recently seen aircraft. The keys are: * true_heading: Heading, degrees clockwise from true north * baro_rate: Rate of change of barometric altitude, feet/minute * geom_rate: Rate of change of geometric (GNSS / INS) altitude, feet/minute - * squawk: identity (Squawk), encoded as 4 hex digits + * squawk: Mode A code (Squawk), encoded as 4 octal digits, useful for ADS-B report correlation with SSR data * emergency: provide asdditional information regarding aircraft status (2.2.3.2.7.8.1.1) * category: emitter category to identify particular aircraft or vehicle types (values A0 - D7) (2.2.3.2.5.2) - - Set A: Light, Small, Large, High Vortex Large, High Performance, Rotorcraft - - Set B: Glider, Lighter than Air, Parachutist, Ultralight, Unmanned Areal Vehicel, Space/Transatmospheric vehicle - - Set C: Emergency Vehicle, Service Vehicle, Obstruction + - Set A: + 1 Light, 2 Small, 3 Large, 4 High Vortex Large, 5 Heavy, 6 High Performance, 7 Rotorcraft + - Set B: + 1 Glider,2 Lighter than Air, 3 Parachutist, 4 Ultralight, 6 Unmanned Areal Vehicel, 7 Space/Transatmospheric vehicle + - Set C: + 1 Emergency Vehicle, 2 Service Vehicle, 3..5 Obstruction - Set D: Reserved * nav_qnh: altimeter setting (QFE or QNH/QNE), millibars * nav_altitude: selected altitude * nav_heading: selected heading - * nav_modes: ['autopilot', 'vnav', 'althold', 'approach', 'lnav', 'tcas'] + * nav_modes: target state and status with 'autopilot', 'vnav', 'althold', 'approach', 'lnav', 'tcas' * lat, lon: the aircraft position in decimal degrees * nic: Navigation Integrity Category (2.2.3.2.7.2.6) - * rc: Radius of Containment in meters + * rc: Radius of Containment, (Rc) + is the radius that there is a 95% probability the aircraft is within that radius of its stated position, + both horizontally and vertically. * seen_pos: how long ago (in seconds before "now") the position was last updated * version: ADS-B Version Number 0, 1, 2 (3-7 are reserved) (2.2.3.2.7.5) * nic_baro: Navigation Integrity Category for Barometric Altitude (2.2.5.1.35) * nac_p: Navigation Accuracy for Position (2.2.5.1.35) * nac_v: Navigation Accuracy for Velocity (2.2.5.1.19) * sil: Source Integity Level (2.2.5.1.40) + probability of the reported horizontal position exceeding the radius of containment defined by the NIC * sil_type: unknown, perHour, perSample * gva: Geometric Vertical Accuracy (2.2.3.2.7.2.8) * sda: System Design Assurance (2.2.3.2.7.2.4.6) - * mlat: list of fields based on MLAT e.g. ['lat', 'lon', 'nic', 'rc', 'nac_v'] + * mlat: list of fields based on MLAT e.g. 'lat', 'lon', 'nic', 'rc', 'nac_v' * tisb: ??? list of fields based on TIS-B ??? * messages: total number of Mode S messages received from this aircraft * seen: how long ago (in seconds before "now") a message was last received from this aircraft