MH/T 4037.2-2017General technical requirements for multilateration systems. Part 2: Wide area multilateration systems (English PDF)

3.1 Terms and definitions

The following terms and definitions defined in MH/T 4037.1 apply to this document.

3.1.1

Wide area multilateration systems Mainly adopt the time difference of arrival positioning technology, and determine the area and terminal (approach) by acquiring the signal transmitted by the secondary surveillance radar transponder and a group of equipment for the location and identification information of aircraft in the airspace controlled by the airport.

3.1.2

Target

An activated aircraft with a secondary surveillance radar transponder.

3.1.3

False detection

The detection target is a false target, or its position deviates from the true target position by more than 2 100 m under the control interval of 10 km in the area, or terminal (approach) Detection where the position deviates from the true target position by more than 1 690 m at a control interval of 6 km.

3.2 Abbreviations

4.1 System composition

4.1.1 The system is mainly composed of an inquiry station, a receiving station, a test answering machine (optional), a central processing station, a monitoring and maintenance unit, and a communication transmission device.

Composition.

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 In the data-driven mode, under the condition that the transmission delay caused by the communication infrastructure does not exceed 500 ms, the system processing delay should not be more than 1 s. In the periodic delay mode, the system processing delay should not be greater than the target report output cycle plus 1 s. Cyclical forecast in the mode, the system processing delay should not exceed 0.5 s.

4.3.3 The maximum update interval of the route target report should be 8 s, and the target report update rate should be adjustable within 8 s. Terminal (approach) target report the maximum report update interval should be 5 s, and the target report update rate should be adjustable within 5 s.

4.3.4 Within 3 times the maximum update interval of target report, the probability of system update ACID and mode A code change should not be less than 95%. At present Within the maximum interval for updating the standard report, the probability of the system updating the emergency code and SPI should not be less than 95%.

4.3.5 The system periodic service report update rate should not exceed 5 s each time.

4.3.6 The accuracy of the horizontal position of the en-route target should not be greater than 350 m (root mean square error). Terminal (approach) target horizontal position accuracy should not More than 150 m (root mean square error).

4.3.7 The detection probability of the system position should not be less than 97%.

4.3.8 The probability of system error detection should not be greater than 10-3.

4.3.9 Within one target report update interval, the probability of the system identifying the aircraft address code should not be less than 99%.

4.3.10 Within the maximum update interval of 1 target report, the probability of the system identifying the pattern A code should not be less than 98%.

4.3.11 Within the maximum update interval of one target report, the probability of the system identifying the pattern C code should not be less than 96%.

4.3.12 The probability that the system incorrectly recognizes the aircraft address code, mode A code, mode C code, and ACID should not be greater than 0.1%.

4.3.13 After the target enters the monitoring range of the system, within no more than 5 times the maximum update interval of target report, the initial probability of the system track should reach 99%. For a take-off target, after entering the monitoring range of the system, the initial system track is not more than 3 times the maximum update interval of the target report.

The rate should reach 99%.

4.3.14 For an aircraft with only mode A/C transponder, under the airspace range and separation level shown in Table 1, its position detection probability and code identification the individual probability should meet the following requirements.

--Position detection probability. not less than 60% under interval 1 condition, and not less than 98% under interval 2 condition;

——Code recognition probability. not less than 30% under interval 1 condition, and not less than 90% under interval 2.

4.3.15 The system should be able to distinguish targets with the same aircraft address code that are separated by more than 10 NM.

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 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 The transmitted pulse of the transmitter shall meet the relevant requirements of the interrogation pulse electrical characteristics specified in MH/T 4010.

4.4.5 The pulse peak power of the transmitter should meet the coverage requirements of the system monitoring range, and the output power should be adjustable.

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 mode 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.

4.5 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 The working frequency of the receiver is 1 090 MH z±3 MH z;

4.5.4 The receiver sensitivity should not be greater than -85 dBm.

4.5.5 The dynamic range of the receiver should not be less than 75 dB.

4.5.6 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 -88 dBm, the correct detection and decoding rate should not be less than 90%; when the power is -91 dBm, the correct detection and decoding rate should not be small Less than 15%.

4.5.7 The antenna polarization mode 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.

4.6 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 The data output shall support data drive mode, periodic delay mode and periodic prediction mode.

4.7.3 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.

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

4.7.5 The target report should contain at least the following data items and data information.

a) Data source identification;

b) Target report description;

c) Target measurement position expressed in WGS-84 coordinate system;

d) 3/A mode code;

e) ACID;

f) Barometric altitude;

g) time of day;

h) Track number;

i) Track status;

j) SPI;

k) Aircraft address code (applicable to mode S targets);

l) Position accuracy;

m) Transponder communication/ACAS capability and flight status;

n) Duplicate or illegal aircraft address code identification;

o) Validity period of air pressure altitude data;

p) Target report sending time.

4.7.6 Service retribution includes at least the following data items.

a) Message type;

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 The functions of recording, querying, statistics and archiving of information such as system operating status, operation configuration and faults shall be provided.

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

4.9 Working environment

The system should be able to work normally under the following conditions.

a) Power supply.

1) Receiving station, transmitting station, test transponder. AC 220 V±22 V, 50 Hz±1 Hz; DC 24 V or 48 V;

2) Central processing station, monitoring and maintenance unit. AC 220 V±22 V, 50 Hz±1 Hz;

b) Indoor equipment.

1) Temperature. 0 °C~40 °C; 10 °C~35 °C (central processing station);

2) Humidity. 5%RH~90%RH, no condensation; 30%RH~80%RH, no condensation (central processing station);

c) Outdoor equipment.

1) Temperature. -55 °C~70 °C;

2) Humidity. 5%RH~100%RH, no condensation;

3) Wind speed. 160 km/h;

4) Rainfall. Rainfall is 16 mm/h;

5) Hail. diameter 12 mm, wind speed 17 m/s;

6) Ice load. radial thickness 10 mm;

7) Salt fog. able to work in coastal areas;

8) Shell protection grade. not lower than the IP66 grade specified in GB/T 4208.