ADS-B System

HOMEProductADS-B System

ADS-B (Automatic Dependent Surveillance-Broadcasting) System

ADS-B (Automatic Dependent Surveillance-Broadcasting) is a surveillance technology which collects data of aircraft call sign, position, altitude and speed from an aircraft navigation system and broadcasts the data through a data link. It was proposed as a Mode S-based 1090ES (Extended Squitter) and UAT (Universal Access Transceiver) from ICAO through ADS-B data link and 1090ES serves as a surveillance system for transportation aircrafts while UAT is selected for standard aircraft flying under 18,000 ft for multi-broadcasting.

(1) UAT System Overview

UAT (Universal Access Transceiver) was developed later than other ADS-B data link technologies and designed to support data broadcasting ADS-B and surface-to-air. UAT supports ground-based data broadcasting application as it is optimized for improving its surveillance and situational awareness. UAT uses the 978MHz UHF frequency band and is operated as a single channel broadband data link with a data rate of approx. 1Mbps/sec. Its media access splits 1-second frame into 2 segments and supports multi-access. The first half of an individual frame is assigned to a ground-based broadcasting service (TIS-B, FIS-B) and the second half is allocated for ADS-B.

Automatic Defendant Surveillance-Broadcasting (ADS-B)is a cutting-edge aircraft position surveillance system which informs pilots and traffic controllers of aircraft's call sign, position, speed and altitude providing an excellent work environment.
Traffic Information Service-Broadcasting (TIS-B) is a ground-based service designed to provide aircraft with an ADS-B with the surveillance data of aircraft without ADS-B.
Flight Information Service-Broadcasting (FIS-B)is a non-controlled surface-to-air broadcasting system which provides pilots with alert (warning) data for safer and more efficient operation in both national and international airspace. FIS provides meteorological data (METAR: Aviation Routine Weather Report, TAF: Aerodrome Forecast), special airspace data, flight limitation notice and other data.

ADS-B System

[ADS-B Data Link Comparison (UAT vs. 1090ES)]

spec
Item UAT(Universal Access Transceiver) 1090ES(Extended Squitter)
Type Aviation Information Communication System Air Navigation Safety Wireless Communication System
데이터링크 적용 Standard aircraft (US) Transportation aircraft (world)
국제기술기준 ICAO Annex 10. Vol.3
ICAO Doc 9861
RTCA DO-282B
ICAO Annex 10. Vol.4
RTCA DO-260B
EUROCAE ED-129
배경 Developed by MITRE (US) as a base technology to overcome the limitation of 1090MHz (97-98)
Defined based on the technology panel for improving the secondary surveillance radar and collision prevention system (established as a standard in 2000)
Used for FAA Alaska Capstone Program since 2000
서비스 ADS-B / TIS-B / FIS-B ADS-B
주파수 978 MHz 1090 MHz
다중접속 Random access Random access
데이터 전송률 1.04 Mbps 1 Mbps
대역폭 1.3 MHz 11 MHz
장점 - Two-way service support
- Long distance traveling range (reception sensitivity: -94dBm)
- Error correction (R-S Code)
- Resistance to fading (intensity and phase of reception radio waves vary)
- Better CRC performance than Mode A/C
- Use of the existing Mode S(ES) transponder
- Reception sensitivity (-88dBm)
단점 - Require new mounting devices
- Require localized frequency
-No two-way service support
-Broad bandwidth
-Limited potential for growth
-Excessive FRUIT

(2) UAT System Components

UAT ground stations receive ADS-B signals sent by UAT-mounted equipment on a regular basis and this message contains the current position, altitude, speed vector and call sign. Then, the ground stations decode the data and convert to ASTERIX format before sending it to the ADS-Bserver through network for aviation surveillance

The ADS-B server merges, filters and converts the ADS-B data received from the UAT ground equipment to generate the surveillance data and sends it to an ADS-B monitoring system for monitoring aviation situation and status.

The TIS-B server stores the surveillance data received from the ADS-B server and ATM and converts it to ASTERIX CAT062 format before sending it to an ADS-B monitoring system and UAT ground station

The FIS-B server stores the data received from the FIS-B Provider and converts it to the application protocol data format (i.e. FIS-B Product) to send to an ADS-B monitoring system and UAT ground station.

UAT System Layout

Performance Validation System

ADS-B system for next-generation aircraft surveillance has the following specifications:

[ADS-B Equipment (1090ES)]

spec
Reception Range 200NM
Target Capacity 400 simultaneous targets
Latency < 250 m
Sensitivity -88dBm(90% SMR)
Dynamic Range -88dBm(90% SMR)
MTBF 87,600 hour
Data Output ASTERIX Cat. 021, Cat. 023, RAW Data
MOPS Compliance RTCA DO-260B, EUROCAE ED-129
Modulation PPM(Pulse Position Modulation)
Frequency 1090MHz (±1MHz)
Mounting 19” Rack Mount
Dimensions(mm) 133.35(H) x 482.6(W) x 450(D)
Weight <12Kg
Input Voltage 100~240VAC, 50/60Hz
Power Consumption 70 watts
Operating Temperature Range -5℃ ~ +45℃
Storage Temperature Range -20℃ ~ +65℃
Humidity 95% at 65℃
Safety Certifications EN55022(class B) Radiated Emission
IEC 60950
Operational Data Ethernet 10/100 base T, UDP IP V4
Remote Control SNMP V2

[ADS-B Equipment (UAT)]

spec
Reception Range 200NM
Target Capacity 500 simultaneous targets
Latency < 250 m
Sensitivity -96dBm (90% SMR)
Dynamic Range -90dBm ~ -3dBm
Output power 50W (+47dBm)
MTBF 62,360 hour
Data Output ASTERIX Cat. 021, Cat. 023, RAW Data
MOPS Compliance RTCA DO-282B
Modulation Continuous Phase FSK
Frequency 978MHz (±20PPM)
Data rate 1.04Mbps
Mounting 19” Rack Mount
Dimensions(mm) 133.35(H) x 482.6(W) x 450(D)
Weight <12Kg
Input Voltage 100~240VAC, 50/60Hz
Power Consumption 100 watts
Operating Temperature Range -5℃ ~ +45℃
Storage Temperature Range -20℃ ~ +65℃
Humidity 95% at 65℃
Safety Certifications EN55022(class B) Radiated Emission
IEC 60950
Operational Data Ethernet 10/100 base T, UDP IP V4
Remote Control SNMP V2