MH/T 4037.1-2017General technical requirements for multilateration systems. Part 1: Aerodrome surface multilateration systems (English PDF)

3.1 Terms and definitions

The following terms and definitions apply to this document.

3.1.1

Aerodrome surface multilateration systems Mainly adopt the time difference of arrival positioning technology, and determine the position of the aircraft on the airport surface by acquiring the signal transmitted by the secondary surveillance radar transponder and identification information.

Note. For airport surface vehicles equipped with equivalent secondary surveillance radar transponders, this technology can also be used to determine vehicle location and identification information.

3.1.2

Target

Aircraft and vehicles equipped with secondary surveillance radar transponder and activated or equivalent equipment.

3.1.3

Manoeuvring area

Except for the apron, the area of the airport used for aircraft take-off, landing and taxiing.

3.1.4

Time of arrival

The transmission time required for the target transmission signal to reach the receiving station in line-of-sight propagation mode.

3.1.5

Time difference of arrival the difference between the arrival time of the signal transmitted by the same target.

3.1.6

System capacity

The system can track and display the maximum number of targets simultaneously.

3.1.7

Processing delay

The time from when the receiving station receives the target signal to when the system outputs the target report.

3.1.8

False detection

The detection target is a false target or its position deviates from the real target position by more than 50 m.

3.1.9

Line of sight

The way in which radio transmitting equipment and receiving equipment propagate signals through a direct path.

3.2 Abbreviations

The following abbreviations apply to this document.

4.1 System composition

4.1.1 The system is mainly composed of interrogation station, receiving station, test answering machine, central processing station, monitoring and maintenance unit and communication transmission equipment.

4.1.2 System communication transmission equipment should have the ability to support dual-network configuration and dual-network operation.

4.1.3 The receiving station, the interrogation station and the test answering machine shall support the redundant configuration of main and standby dual machines, and have the function of manual/automatic switching.

4.1.4 The central processing station shall adopt a redundant configuration of active and standby dual networks and dual computers, and have manual/automatic switching functions.

4.1.5 The hardware equipment of the central processing station host, switches, routers, etc. should adopt commercial shelf products.

4.1.6 The central processing station shall adopt a relatively mature operating system such as UNIX, LINUX, and WINDOWS.

4.2 General requirements

4.2.1 The system should meet the requirements of Volume IV of Annex 10 "Aeronautical Telecommunications" of ICAO "Convention on International Civil Aviation".

4.2.2 The system should have good scalability and be able to meet changes in the monitoring range of the system by adjusting the number and location of receiving stations and interrogating stations.

Demand.

4.2.3 The interconnection between the system LRU and the hardware in the system shall adopt a physical error-proof installation design.

4.2.4 The receiver and transmitter antenna feed unit and the inside of the machine should adopt lightning protection design.

4.2.5 The power-on, manual restart and automatic restart time of the central processing station shall be no more than 3 minutes, and the receiving station, interrogation station and test answering machine shall be turned on.

The time of machine, manual restart and automatic restart should not exceed 90 s. The receiving station, the interrogation station and the test transponder shall be equipped with automatic Dynamic start capability.

4.2.6 The switching time between the main and standby systems of the system should not exceed 3 s, and the switching should not affect the normal operation of the system.

4.2.7 The system should have the BITE self-check function, real-time and continuous detection of the system running status, and be able to isolate the faulty unit. malfunction the detection rate should be no less than 90%, and the fault isolation rate should be no less than 95%.

4.2.8 The system should have the ability to resist multipath interference and resolve interleaving responses and synchronous crosstalk.

4.2.9 The system power module shall have overcurrent and overvoltage protection functions.

4.2.10 The system should be able to work continuously for 24 hours, and the design life of the system should be greater than 15 years.

4.2.11 Excluding the planned maintenance time, the annual system availability should not be less than 99.99%.

4.2.12 The system MTBCF should be greater than 10 000 h, and the system MTTR should be less than 1 h.

4.2.13 The system should be able to transmit the mode A/C and mode S interrogation signals of the secondary surveillance radar meeting the requirements of MH/T 4010.

4.2.14 The system should be able to receive and process secondary surveillance radar mode A/C and mode S signals that meet the requirements of MH/T 4010.

4.3 Performance requirements

4.3.1 The system capacity should not be less than 400.When the system handles the target quantity overload, it should be able to handle the ASTERIX CAT 019 service report the system status data item of, gives the system overload prompt information and status prompt information.

4.3.2 The system processing time delay should not exceed 0.5 s.

4.3.3 Within the scope of system monitoring, the average update rate of target reports should be designed at least once per second. Within the scope of system monitoring, the probability that the airborne mode S target reaches the target report average update rate once per second should not be less than 95%; in the maneuvering zone, the mode S target reaches the target.

The probability that the average update rate of the target report is 1 time per second should not be less than 95%; on the apron, the mode S target reaches the target report average update rate per second.

The probability of one time should not be less than 70%; in the parking position, the probability of the mode S target reaching the target report average update rate should be no less than 50%.

4.3.4 The system periodic service report update rate should not be greater than 1 s each time.

4.3.5 On the centerline of the runway, taxiway and apron, the confidence that the target horizontal position accuracy reaches 7.5 m should be 95%.

The confidence that the position accuracy reaches 12 m should be 99%; at the stand, the average horizontal position error of the target within 5 s should not exceed 20 m.

4.3.6 For runway, taxiway and apron centerline mode S targets, the probability of detecting the target and calculating the target position within 2 s should be not less than 99.9%; For targets in stand mode S, the probability of detecting the target and calculating the target position within 5 s should not be less than 99.9%.

4.3.7 The probability of system error detection should be less than 10-4.

4.3.8 For mode S targets, the system target recognition probability should be greater than 99.9%.

4.3.9 In the 5 s period, the probability of the system misidentifying the target should be less than 10-6.

4.3.10 For targets whose transponder turns on and enters the surveillance range, the starting time of the system track should not be greater than 5 s.

4.4 Inquiry Station

4.4.1 The interrogation station is mainly composed of transmitters, antenna feeder units, necessary network transmission equipment, cabinets, lightning protection devices and other auxiliary facilities. ask the station should support indoor or outdoor installation.

4.4.2 The interrogation station should be able to receive the interrogation control instructions from the central processing station and interrogate the target.

4.4.3 The working frequency of the transmitter interrogation signal is 1 030.00 MH z ± 0.01 MH z.

4.4.4 Transmitter emission pulse indicators should meet the relevant requirements of the interrogation pulse electrical characteristics specified in MH/T 4010.

4.4.5 The range of the transmitter should not be less than 2.5 km.

4.4.6 In the passive operation mode, when the system can receive enough target emission signals, it should not conduct active inquiry.

4.4.7 When conducting mode S inquiry, only mode S all-call mode and mode A/C/S all-call mode should not be used, and selective inquiry mode should be used.

Mode, and cannot lock the target.

4.4.8 The antenna polarization method is vertical polarization, the impedance of the antenna and the feeder should be 50 ohm, and the standing wave ratio should not be greater than 1.5.1.

4.5 Receiving station

4.5.1 The receiving station is mainly composed of receivers, antenna feeder units, necessary network transmission equipment, cabinets, lightning protection devices and other auxiliary facilities. receive the station should support indoor or outdoor installation.

4.5.2 The receiving station should be able to receive the target transmitted signal and decode the signal.

4.5.3 For a system implemented by a distributed clock, the time difference measurement accuracy between any two receiving stations should not exceed 10 ns (Root Mean Square Error).

4.5.4 The operating frequency of the receiver is 1 090 MH z ± 3 MH z.

4.5.5 The receiver sensitivity should not be greater than -75 dBm.

4.5.6 The dynamic range of the receiver should not be less than 65 dB.

4.5.7 When the received signal power of the receiver is between MTL 3 dBm and the upper limit of the dynamic range of the receiver, the correct detection and decoding rate should not be less than 99.9%; when the power is -78 dBm, the correct detection and decoding rate should not be less than 90%; when the power is -81 dBm, the correct detection and decoding rate should not be small Less than 15%.

4.5.8 The antenna polarization method should be vertical polarization, the antenna and feeder impedance should be 50 ohm, and the standing wave ratio should not be greater than 1.5.1.

4.6 Testing the answering machine

4.6.1 Test transponder is used for system integrity testing, mainly composed of transmitter, receiver, antenna feed unit and lightning protection device.

4.6.2 The operating frequency of the transmitter is 1 090 MH z ± 0.01 MH z. Transmit pulse amplitude difference, frequency spectrum, spurious and second harmonic and other indicators the electrical characteristics of the interrogation pulse specified by MH/T 4010 shall be met.

4.6.3 The working frequency of the receiver is 1 030 MH z±3 MH z, the tangent sensitivity should not be greater than -74 dBm, the dynamic range should be greater than 50 dB, the test probability should be greater than 90%.

4.6.4 The antenna polarization method should be vertical polarization, the antenna and feeder impedance should be 50 ohm, and the standing wave ratio should not be greater than 1.5.1.

4.7 Central Processing Station

4.7.1 By processing the information transmitted by the receiving station, the monitoring target can be located, identified and tracked.

4.7.2 ASTERIX CAT 019 service report and ASTERIX CAT 020 target report should be output, and the data transmission protocol should support at least UDP and HDLC.

4.7.3 ASTERIX CAT 010 scene moving datagram should be output, and the data transmission protocol should support at least UDP and HDLC.

4.7.4 The ASTERIX CAT 021 ADS-B target report should be output independently.

4.7.5 The multi-point positioning target report should contain at least the following data items.

a) Message type (applicable to ASTERIX CAT 010);

b) Data source identification;

c) Target report description;

d) The target measurement position expressed by WGS-84 coordinate system or rectangular coordinate system;

e) 3/A mode code;

f) Measuring height;

g) time of day;

h) Track number;

i) Track status;

j) Aircraft address code;

k) Position accuracy.

4.7.6 Service retribution includes at least the following data items.

a) Message type (applicable to ASTERIX CAT 010);

b) Data source identification;

c) time of day;

d) System status.

4.7.7 The UTC time synchronization function shall be provided, and the error of the target reporting date shall be no more than 100 ms.

4.8 Monitoring and Maintenance Unit

4.8.1 It shall have the functions of real-time display and record playback of monitoring targets.

4.8.2 The local and remote monitoring equipment of the system shall have the same monitoring capabilities, and the remote monitoring data transmission protocol shall support SNMP.

4.8.3 It should be able to compose modules of the system (including receivers, interrogators, test transponders, central processors, power supplies, etc.) and between modules Real-time monitoring of the communication network, at least able to monitor the LRU, should be able to provide a logical view and physical view based system operating status display Show.

4.8.4 It should be possible to periodically check the key performance parameters of the system.

4.8.5 The integrity of the system should be able to be continuously checked.

4.8.6 It should be able to configure and configure the system components (including receiver, interrogator, test transponder, central processor, power supply, etc.) Control, including at least the following functions.

a) Device switching and restarting;

b) System software upgrade;

c) System operation parameter configuration.

4.8.7 It should be possible to initialize the failed component.

4.8.8 It should be able to analyze the quality of system data output based on information such as target location and identification.

4.8.9 It shall have the functions of recording, querying, statistics and archiving of information such as system operation status, operation configuration and faults.

4.8.10 It shall be able to carry out hierarchical management of system user rights.

4.9 Working environment