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7.1.2.3 Range information is decoded independently.
7.1.3 The receiver decodes the full range of angles permitted by the signal format for each function. The guidance
angle is determined by measuring the time interval between the received envelopes of the TO and FRO scans. The decoded
angle is related to this time interval by the equation given in Chapter 3, 3.11.4.5.
7.1.4 The receiver is capable of normal processing of each radiated function without regard to the position of the
function in the transmitted sequences.
7.1.5 If the MLS approach azimuth and back azimuth information is presented on the selector and/or flight instruments,
it is to be displayed in magnetic degrees. Receivers in the automatic mode display the relevant information transmitted by the
ground station as part of the basic data word 4.
7.1.6 The receiver has the capability for both manual and automatic selection of approach track, elevation angle and
back azimuth radial when provided. When in automatic mode, the selection is made as follows.
7.1.6.1 Approach azimuth — select the angular reciprocal of the approach azimuth magnetic orientation in basic data
word 4.
7.1.6.2 Elevation angle — select the minimum glide path in basic data word 2.
7.1.6.3 Back azimuth — select the angle of the back azimuth magnetic orientation in basic data word 4.
Note.— The receiver indicates when deviation is referenced to the back azimuth signal.
7.1.7 The MLS airborne receiver system must have an integrity compatible with the overall integrity of MLS which is
at least 1 – 1 × 10–7 in any one landing.
7.1.8 For airborne equipment used in MLS/RNAV operations the capability is to be provided to unambiguously display
the procedure selected.
ATT G-23 23/11/06
Annex 10 — Aeronautical Communications Volume I
7.2 Radio frequency response
7.2.1 Acceptance bandwidth
7.2.1.1 The receiver should meet acquisition and performance requirements when the received signal frequency is
offset by up to plus or minus 12 kHz from the normal channel centre frequency. This figure considers possible ground
transmitter offsets of plus or minus 10 kHz and Doppler shifts of plus or minus 2 kHz. The receiver should decode all
functions independently of the different frequency offsets of one function relative to another.
7.2.2 Selectivity
7.2.2.1 When the receiver is tuned to an inoperative channel and an unwanted MLS signal of a level 33 dB above that
specified in Chapter 3, 3.11.4.10.1 for the approach azimuth DPSK is transmitted on any one of the remaining channels, the
receiver should not acquire the signal.
7.2.3 In-channel spurious response
7.2.3.1 The receiver performance specified in Chapter 3, 3.11.6, should be met when, in addition, interference on the
same channel is received at a level not exceeding that specified in Chapter 3, 3.11.4.1.4.
7.2.4 Interference from out-of-band transmissions
7.2.4.1 The receiver performance in Chapter 3, 3.11.6 is to be met when, in addition, interference from undesired
signals is received at a level not exceeding –124.5 dBW/m2 at the MLS receiver antenna.
7.3 Signal processing
7.3.1 Acquisition
7.3.1.1 The receiver should, in the presence of an input guidance signal which conforms to the requirements of
Chapter 3, 3.11.4, acquire and validate the guidance signal before transitioning to the track mode within two seconds along
the critical portion of the approach and within six seconds at the limits of coverage.
7.3.2 Tracking
7.3.2.1 While tracking, the receiver should provide protection against short duration large amplitude spurious signals.
When track is established, the receiver should output valid guidance information before removing the warning. During track
mode, the validation process should continue to operate.
7.3.2.2 After loss of the tracked signal for more than one second, the receiver should provide a warning signal. Within
the one-second interval, the guidance information should remain at the last output value.
Note 1.— A validated guidance signal is one that satisfies the following criteria:
a) the correct function identification is decoded;
b) the preamble timing signal is decoded;
23/11/06 ATT G-24
Attachment G Annex 10 — Aeronautical Communications
c) the “TO” and “FRO” scanning beams or left/right clearance signals are present and symmetrically located with
respect to the midpoint time; and
d) the detected beamwidth is from 25 to 250 microseconds.
Note 2.— Guidance signal validation also requires that the receiver repeatedly confirm that the signal being acquired or
tracked is the largest and most persistent signal within the coverage.
7.3.3 Data functions
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