Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2106

b) aeronautical station transmitters: for transmitter power up to and including 50 W: [43 + 10 log P (W)] dB - - P for transmitter power more than 50 W, the attenuation shall be at least 60 dB. 0 dB ANNEX 10 — VOLUME III I-12-1 22/11/07 CHAPTER 12. UNIVERSAL ACCESS TRANSCEIVER (UAT) 12.1 DEFINITIONS AND OVERALL SYSTEM CHARACTERISTICS 12.1.1 Definitions High performance receiver. A UAT receiver with enhanced selectivity to further improve the rejection of adjacent frequency DME interference (see 12.3.2.2 for further details). Optimum sampling point. The optimum sampling point of a received UAT bit stream is at the nominal centre of each bit period, when the frequency offset is either plus or minus 312.5 kHz. Power measurement point (PMP). A cable connects the antenna to the UAT equipment. The PMP is the end of that cable that attaches to the antenna. All power measurements are considered as being made at the PMP unless otherwise specified. The cable connecting the UAT equipment to the antenna is assumed to have 3 dB of loss. Pseudorandom message data block. Several UAT requirements state that performance will be tested using pseudorandom message data blocks. Pseudorandom message data blocks should have statistical properties that are nearly indistinguishable from those of a true random selection of bits. For instance, each bit should have (nearly) equal probability of being a ONE or a ZERO, independent of its neighbouring bits. There should be a large number of such pseudorandom message data blocks for each message type (Basic ADS-B, Long ADS-B or Ground Uplink) to provide sufficient independent data for statistical performance measurements. See Section 2.3 of Part I of the Manual on the Universal Access Transceiver (UAT) (Doc 9861) for an example of how to provide suitable pseudorandom message data blocks. Service volume. A part of the facility coverage where the facility provides a particular service in accordance with relevant SARPs and within which the facility is afforded frequency protection. Standard UAT receiver. A general purpose UAT receiver satisfying the minimum rejection requirements of interference from adjacent frequency distance measuring equipment (DME) (see 12.3.2.2 for further details). Successful message reception (SMR). The function within the UAT receiver for declaring a received message as valid for passing to an application that uses received UAT messages. See Section 4 of Part I of the Manual on the Universal Access Transceiver (UAT) (Doc 9861) for a detailed description of the procedure to be used by the UAT receiver for declaring successful message reception. UAT ADS-B message. A message broadcasted once per second by each aircraft to convey state vector and other information. UAT ADS-B messages can be in one of two forms depending on the amount of information to be transmitted in a given second: the Basic UAT ADS-B Message or the Long UAT ADS-B Message (see 12.4.4.1 for definition of each). UAT ground stations can support traffic information service-broadcast (TIS-B) through transmission of individual ADS-B messages in the ADS-B segment of the UAT frame. UAT ground uplink message. A message broadcasted by ground stations, within the ground segment of the UAT frame, to convey flight information such as text and graphical weather data, advisories, and other aeronautical information, to aircraft that are in the service volume of the ground station (see 12.4.4.2 for further details). Universal access transceiver (UAT). A broadcast data link operating on 978 MHz, with a modulation rate of 1.041667 Mbps. Annex 10 — Aeronautical Communications Volume III 22/11/07 I-12-2 12.1.2 UAT overall system characteristics of aircraft and ground stations Note.— Details on technical requirements related to the implementation of UAT SARPs are contained in Part I of the Manual on the Universal Access Transceiver (UAT) (Doc 9861). Part II of the Manual on the Universal Access Transceiver (UAT) (Doc 9861) (in preparation) will provide additional guidance material. 12.1.2.1 TRANSMISSION FREQUENCY The transmission frequency shall be 978 MHz. 12.1.2.2 FREQUENCY STABILITY The radio frequency of the UAT equipment shall not vary more than ±0.002 per cent (20 ppm) from the assigned frequency. 12.1.2.3 TRANSMIT POWER 12.1.2.3.1 TRANSMIT POWER LEVELS UAT equipment shall operate at one of the power levels shown in Table 12-1*. 12.1.2.3.2 MAXIMUM POWER The maximum equivalent isotropically radiated power (EIRP) for a UAT aircraft or ground station shall not exceed +58 dBm. Note.— For example, the maximum EIRP listed above could result from the maximum allowable aircraft transmitter power shown in Table 12-1 with a maximum antenna gain of 4 dBi. 12.1.2.3.3 TRANSMIT MASK The spectrum of a UAT ADS-B message transmission modulated with pseudorandom message data blocks (MDB) shall fall within the limits specified in Table 12-2 when measured in a 100 kHz bandwidth. Note.— Figure 12-1* is a graphical representation of Table 12-2. 12.1.2.4 SPURIOUS EMISSIONS Spurious emissions shall be kept at the lowest value which the state of the technique and the nature of the service permit. Note.— Appendix 3 of the ITU Radio Regulations requires that transmitting stations shall conform to the maximum permitted power levels for spurious emissions or for unwanted emissions in the spurious domain. * All tables and figures are located at the end of the chapter. Part I Annex 10 — Aeronautical Communications I-12-3 22/11/07 12.1.2.5 POLARIZATION The design polarization of emissions shall be vertical. 12.1.2.6 TIME/AMPLITUDE PROFILE OF UAT MESSAGE TRANSMISSION The time/amplitude profile of a UAT message transmission shall meet the following requirements, in which the reference time is defined as the beginning of the first bit of the synchronization sequence (see 12.4.4.1.1, 12.4.4.2.1) appearing at the output port of the equipment. Notes.—

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