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Radar Service

Learn about radar systems used in air traffic control, including primary and secondary surveillance radar. Understand how radar works, applications in aircraft, and identification procedures.

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Radar Service

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  1. Magesh Mani BSACIST

  2. Radar Service Magesh Mani BSACIST

  3. A radar system will normally consist of anumber of integrated elements, including radar sensor(s),radar data transmission lines, radar data processing system,radar displays. Magesh Mani BSACIST

  4. Magesh Mani BSACIST

  5. How Radar Works • Radio Detection and Ranging • A signal, at constant intervals is sent through the area to be monitored using a antennae. • Any object in the path of the signal reflects the part of the signal. • A receiver receives the signal which is translated into a dot on the CRO Magesh Mani BSACIST

  6. Example of Radar use in an Aircraft Magesh Mani BSACIST

  7. Primary Surveillance Radar Airport Surveillance Radar Approach control primary radar used to detect and display an aircraft's position in the terminal area. ASR provides range and azimuth information but does not provide elevation data. Coverage of the ASR can extend up to 60 miles. Air Route Surveillance Radar Air route traffic control center (ARTCC) primary radar used primarily to detect and display an aircraft's position while en route between terminal areas. The ARSR enables controllers to provide radar air traffic control service when aircraft are within the ARSR coverage. In some instances, ARSR may enable an ARTCC to provide terminal radar services similar to but usually more limited than those provided by a radar approach control.   Precision Approach Radar (PAR) PAR is designed for use as a landing aid rather than an aid for sequencing and spacing aircraft. PAR equipment may be used as a primary landing aid or it may be used to monitor other types of approaches. It is designed to display range, azimuth, and elevation information. Two antennas are used in the PAR array, one scanning a vertical plane, and the other scanning horizontally. Since the range is limited to 10 miles, azimuth to 20 degrees, and elevation to 7 degrees, only the final approach area is covered. Magesh Mani BSACIST

  8. Secondary Surveillance Radar Transponder Interrogator Air Traffic Control Radar Beacon System (ATCRBS) The ATCRBS, sometimes referred to as a secondary surveillance radar, consists of three main components: Magesh Mani BSACIST Radar scope

  9. RADAR SYSTEMS CAPABILITIES • Radar systems used in the provision of air traffic services shall have a very high level of reliability, availability and integrity. • The possibility of system failures or significant system degradations which may cause complete or partial interruptions of service shall be very remote. • Back-up facilities shall be provided. Magesh Mani BSACIST

  10. Types • Primary surveillance radar (PSR) • Secondary surveillance radar (SSR) Magesh Mani BSACIST

  11. Which one to use • They may be used either alone or in combination in the provision of air traffic services, including in the provision of separation between aircraft, provided: • a) reliable coverage exists in the area; • b) the probability of detection, the accuracy and the integrity of the radar systems are satisfactory. • PSR systems should be used in circumstances where SSR alone would not meet the air traffic services requirements. Magesh Mani BSACIST

  12. Which one to use (Cont) • SSR systems, especially those with monopulse technique or Mode S capability, may be used alone, including in the provision of separation between aircraft, provided: • the carriage of SSR transponders is mandatory within the area; • aircraft identification is established and maintained by use of assigned discrete SSR codes. Magesh Mani BSACIST

  13. Identification of aircraft • Before providing radar service to an aircraft, radar identification shall be established and the pilot informed. • Thereafter, radar identification shall be maintained until termination of the radar service. • If radar identification is subsequently lost, the pilot shall be informed accordingly and, when applicable, appropriate instructions issued. • Radar identification shall be established by at least one of the following methods. Magesh Mani BSACIST

  14. SSR IDENTIFICATION PROCEDURES Where SSR is used, aircraft may be identified by one or more of the following procedures: a) recognition of the aircraft identification in a radar label; b) recognition of an assigned discrete code, the setting of which has been verified, in a radar label; c) direct recognition of the aircraft identification of a Mode S-equipped aircraft in a radar label; d) by transfer of radar identification ; e) observation of compliance with an instruction to set a specific code; f) observation of compliance with an instruction to squawk IDENT Magesh Mani BSACIST

  15. PSR IDENTIFICATION PROCEDURES Where SSR is not used or available, radar identification shall be established by at least one of the following methods: a) By correlating a particular radar position indication with an aircraft reporting its position over, or as bearing and distance from, a point displayed on the radar map, and by ascertaining that the track of the particular radar position is consistent with the aircraft path or reported heading; b) by correlating an observed radar position indication with an aircraft which is known to have just departed, provided that the identification is established within 2 km (1 NM) from the end of the runway used. Magesh Mani BSACIST

  16. PSR IDENTIFICATION PROCEDURES (Cont) c) By transfer of radar identification d) by ascertaining the aircraft heading, Magesh Mani BSACIST

  17. Performance checks • The radar controller shall adjust the radar display and carry out adequate checks on the accuracy thereof, in accordance with the technical instructions prescribed by the appropriate authority for the radar equipment concerned. • The radar controller shall be satisfied that the available functional capabilities of the radar system as well as the information presented on the radar display is adequate for the functions to be performed. • The radar controller shall report, in accordance with local procedures, any fault in the equipment, or any incident requiring investigation, or any circumstances which make it difficult or impractical to provide radar services. Magesh Mani BSACIST

  18. USE OF RADAR IN THEAIR TRAFFIC CONTROL SERVICE The information presented on a radar display may be used to perform the following functions in the provision of air traffic control service: a) provide radar services as necessary in order to improve airspace utilization, reduce delays, provide for direct routings and more optimum flight profiles, as well as to enhance safety; b) provide radar vectoring to departing aircraft for the purpose of facilitating an expeditious and efficient departure flow and expediting climb to cruising level; c) provide radar vectoring to aircraft for the purpose of resolving potential conflicts; d) provide radar vectoring to arriving aircraft for the purpose of establishing an expeditious and efficient Approach; Magesh Mani BSACIST

  19. USE OF RADAR IN THEAIR TRAFFIC CONTROL SERVICE e) provide radar vectoring to assist pilots in their navigation, e.g. to or from a radio navigation aid, away from or around areas of adverse weather, etc.; f) provide separation and maintain normal traffic flow when an aircraft experiences communication failure within the area of the radar coverage; g) maintain radar monitoring of air traffic; Note.— Where tolerances regarding such matters as adherence to track, speed or time have been prescribed by the appropriate ATS authority, deviations are not considered significant until such tolerances are exceeded. Magesh Mani BSACIST

  20. USE OF RADAR IN THEAIR TRAFFIC CONTROL SERVICE h) when applicable, maintain a watch on the progress of air traffic, in order to provide a non-radar controller with: i) improved position information regarding aircraft under control; ii) supplementary information regarding other traffic; iii) information regarding any significant deviations by aircraft from the terms of their respective air traffic control clearances, including their cleared routes as well as levels, when appropriate. Magesh Mani BSACIST

  21. USE OF RADAR IN THEAPPROACH CONTROL SERVICE General provisions • Radar systems used in the provision of approach control service shall be appropriate to the functions and level of service to be provided. • Radar systems used to monitor parallel ILS approaches shall meet the requirements for such operations Magesh Mani BSACIST

  22. USE OF RADAR IN THEAPPROACH CONTROL SERVICE Functions The information presented on a radar display may be used to perform the following additional functions in the provision of approach control service: a) provide radar vectoring of arriving traffic on to pilot-interpreted final approach aids; b) provide radar monitoring of parallel ILS approaches and instruct aircraft to take appropriate action in the event of possible or actual penetrations of the no transgression zone (NTZ); c) provide radar vectoring of arriving traffic to a point from which a visual approach can be completed; d) provide radar vectoring of arriving traffic to a point from which a precision radar approach or a surveillance radar approach can be made; Magesh Mani BSACIST

  23. USE OF RADAR IN THEAPPROACH CONTROL SERVICE Functions: e) provide radar monitoring of other pilot-interpreted approaches; f) in accordance with prescribed procedures, conduct: i) surveillance radar approaches; ii) precision radar (PAR) approaches; and g) provide radar separation between: i) succeeding departing aircraft; ii) succeeding arriving aircraft; and iii) a departing aircraft and a succeeding arriving aircraft. Magesh Mani BSACIST

  24. USE OF RADAR IN THEAERODROME CONTROL SERVICE Surveillance radar When authorized by and subject to conditions prescribed by the appropriate ATS authority, surveillance radar may be used in the provision of aerodrome control service to perform the following functions: a) radar monitoring of aircraft on final approach; b) radar monitoring of other aircraft in the vicinity of the aerodrome; c) establishing radar separation between succeeding departing aircraft; and d) providing navigation assistance to VFR flights Magesh Mani BSACIST

  25. USE OF RADAR IN THEAERODROME CONTROL SERVICE • Special VFR flights shall not be radar vectored unless special circumstances, such as emergencies, dictate otherwise. • Caution shall be exercised when radar vectoring VFR flights so as to ensure that the aircraft concerned does not inadvertently enter instrument meteorological conditions. • In prescribing conditions and procedures for the use of radar in the provision of aerodrome control service, the appropriate ATS authority shall ensure that the availability and use of radar information will not be detrimental to visual observation of aerodrome traffic. Note.— Control of aerodrome traffic is in the main based on visual observation of the maneuvering area and the vicinity of the aerodrome by the aerodrome controller. Magesh Mani BSACIST

  26. USE OF RADAR IN THEAERODROME CONTROL SERVICE GENERAL PROVISIONS • The use of SMR should be related to the operational conditions and requirements of the particular aerodrome (i.e. visibility conditions, traffic density and aerodrome layout). • SMR systems shall to the extent possible enable the detection and display of the movement of all aircraft and vehicles on the maneuvering area in a clear and unambiguous manner. • Aircraft and vehicle radar position indications may be displayed in symbolic or non-symbolic form. Where radar labels are available for display, the capability should be provided for inclusion of aircraft and vehicle identification by manual or automated means. FUNCTIONS • SMR should be used to augment visual observation of traffic on the maneuvering area and to provide surveillance of traffic on those parts of the maneuvering area which cannot be observed visually. Magesh Mani BSACIST

  27. USE OF RADAR IN THEAERODROME CONTROL SERVICE The information displayed on an SMR display may be used to assist in: a) monitoring of aircraft and vehicles on the maneuvering area for compliance with clearances and instructions; b) determining that a runway is clear of traffic prior to a landing or take-off; c) providing information on essential local traffic on or near the maneuvering area; d) determining the location of aircraft and vehicles on the maneuvering area; e) providing directional taxi information to aircraft when requested by the pilot or deemed necessary by the controller. Except under special circumstances, e.g. emergencies, such information should not be issued in the form of specific heading instructions; and f) providing assistance and advice to emergency vehicles. Magesh Mani BSACIST

  28. IDENTIFICATION OF AIRCRAFT Where SMR is used, aircraft may be identified by one or more of the following procedures: a) by correlating a particular radar position indication with: i) an aircraft position visually observed by the controller; ii) an aircraft position reported by the pilot; or iii) an identified radar position indication displayed on a surveillance radar display; b) by transfer of radar identification when authorized by the appropriate ATS authority; and c) by automated identification procedures when authorized by the appropriate ATS authority. Magesh Mani BSACIST

  29. USE OF RADAR IN THE FLIGHT INFORMATION SERVICE Note.— The use of radar in the provision of flight • information service does not relieve the pilot-in-command of an aircraft of any responsibilities, including the final decision regarding any suggested alteration of the flight plan. Magesh Mani BSACIST

  30. USE OF RADAR IN THE FLIGHT INFORMATION SERVICE Functions The information presented on a radar display may be used to provide identified aircraft with: a) information regarding any aircraft observed to be on a conflicting path with the radar-identified aircraft and suggestions or advice regarding avoiding action; b) information on the position of significant weather and, as practicable, advice to the aircraft on how best to circumnavigate any such areas of adverse weather; c) information to assist the aircraft in its navigation. Magesh Mani BSACIST

  31. Coordination of traffic underradar and non-radar control • Appropriate arrangements shall be made in any air traffic control unit using radar to ensure the coordination of traffic under radar control with traffic under non-radar control, and to ensure the provision of adequate separation between the radar-controlled aircraft and all other controlled aircraft. • To this end, close liaison shall be maintained at all times between radar controllers and non-radar controllers. Magesh Mani BSACIST

  32. Emergencies • In the event of an aircraft in, or appearing to be in, any form of emergency, every assistance shall be provided by the radar controller, and the procedures prescribed herein may be varied according to the situation. • The progress of an aircraft in emergency shall be monitored and (whenever possible) plotted on the radar display until the aircraft passes out of radar coverage, and position information shall be provided to all air traffic services units which may be able to give assistance to the aircraft. Magesh Mani BSACIST

  33. FLIGHT INFORMATION SERVICE • Recording and transmission of information on the progress of flights • Transfer of responsibility for the provision of flight information service • Transmission of information Magesh Mani BSACIST

  34. Air traffic advisory service • The objective of the air traffic advisory service is to make information on collision hazards more effective than it would be in the mere provision of flight information service. • Air traffic advisory service does not deliver “clearances” but only “advisory information” and it uses the word “advise” or “suggest” when a course of action is proposed to an aircraft. Magesh Mani BSACIST

  35. ALERTING SERVICE • When so required by the appropriate ATS authority to facilitate the provision of alerting and search and rescue services, an aircraft, prior to and when operating within or into designated areas or along designated routes, shall comply with the provisions detailed in rules, concerning the submission, completion, changing and closing of a flight plan. Magesh Mani BSACIST

  36. Who is responsible • When alerting service is required in respect of a flight operated through more than one FIR or control area, and when the position of the aircraft is in doubt, responsibility for coordinating such service shall rest with the ATS unit of the FIR or control area: 1) within which the aircraft was flying at the time of last air-ground radio contact; 2) that the aircraft was about to enter when last air ground contact was established at or close to the boundary of two FIRs or control areas; 3) within which the aircraft’s intermediate stop or final destination point is located: • a) if the aircraft was not equipped with suitable two way radio communication equipment; or • b) was not under obligation to transmit position reports. Magesh Mani BSACIST

  37. Procedure • Notify units providing alerting service in other affected FIRs or control areas of the emergency phase or phases, in addition to notifying the rescue coordination centre associated with it. • Request those units to assist in the search for any useful information pertaining to the aircraft presumed to be in an emergency, by all appropriate means. • Collect the information gathered during each phase of the emergency and, after verifying it as necessary, transmit it to the rescue coordination centre; • Announce the termination of the state of emergency as circumstances dictate. Magesh Mani BSACIST

  38. COORDINATION • COORDINATION IN RESPECT OF THE PROVISION OF FLIGHT INFORMATION SERVICE AND ALERTING SERVICE • COORDINATION IN RESPECT OF THE PROVISION OF AIR TRAFFIC ADVISORY SERVICE • COORDINATION IN RESPECT OF THE PROVISION OF AIR TRAFFIC CONTROL SERVICE • COORDINATION BETWEEN ATC UNITS PROVIDING AIR TRAFFIC SERVICE WITHIN CONTIGUOUS CONTROL AREAS • COORDINATION BETWEEN A UNIT PROVIDING AREA CONTROL SERVICE AND A UNIT PROVIDING APPROACH CONTROL SERVICE • COORDINATION BETWEEN A UNIT PROVIDING APPROACH CONTROL SERVICE AND A UNIT PROVIDING AERODROME CONTROL SERVICE • COORDINATION BETWEEN CONTROL POSITIONS WITHIN THE SAME UNIT • COORDINATION BETWEEN AIR TRAFFIC SERVICES UNITS AND AERONAUTICAL TELECOMMUNICATION STATIONS Magesh Mani BSACIST

  39. Magesh Mani BSACIST

  40. Rules of the air Magesh Mani BSACIST

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