User`s manual

100-M0171X3 11 of 95
GMS Inc. doing business as Cobham Tactical Communications and Surveillance
www.cobham.com/tcs
4. General System Information
4.1 Overview
The Messenger 2 Transmitter Enhanced (M2TE) is a second generation AVC HD/SD COFDM transmitter
that combines all the features and capabilities of Cobham Surveillance’s (CS’s) Messenger 2 AVC HD/SD
Transmitter with the additional features listed in the Key System Features section below. All of this is
included in a smaller housing (8.6 cu inches). Key features include optional Dual Audio/Video/Data
processing with end to end system-level latencies of down to ~44 mS when used with CS
Receiver/Decoders.
The Ultra-low system latency greatly enhances real-time operating when the link is used in time critical
situations like piloting Unmanned Aerial Vehicles (UAVs) or Unmanned Ground Vehicles (UGVs) or in
threat response. Optional Dual video processing enables 3D content collection which provides depth
perception and greater control for UGV applications requiring fine spatial operations like explosive device
de-arming. The M2TE’s 3D capability also enhances Entertainment, Sports, and ENG applications.
The M2TE can optionally provide time-correlated KLV-1 and KLV-2 META data processing
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that is used in
Airborne Surveillance Applications and Geospatial determination. The META data can be extracted from
the SDI/HD-SDI video’s ancillary data space or input on a separate RS-422 interface.
The M2 Series “Messenger Two Series” product line incorporated AVC / H.264 compression technology
with ultra-low delay that covers all the SD and HD formats up to 1080P. AVC compression provides
dramatically increased compression efficiency over MPEG-2 which allows our link to provide superior
coverage over a wider operating range!
There are two core hardware configurations for M2TE. The HD/SD-SDI configuration accepts up to two
Standard Definition (SD) or High Definition (HD) 4:2:2 Digital Video (HD/SD- SDI) or analog composite
Video and Analog Stereo Audio Inputs (Mic or Line Level) and/or optional Embedded Audio up to a total
of two stereo pairs or four mono channels sets or one stereo pair or two mono channels per program.
Mic bias is also provided. In the HDMI configuration
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, the HD/SD-SDI interfaces are replaced with two
HDMI interfaces that accept both digital video and audio.
Both Video programs can be compressed according to the Advanced Video Compression (AVC) / H.264
(HD/SD) specification with the same or different frame resolutions, rates and formats. The low-latency
AVC Encoder supports the Baseline Profile with extensions with resolutions from 480 to 1080 with
support for either interlaced or progressive formats. The Audio is compressed using MPEG-1 Layer 2
compression. Low rate Auxiliary data up to 115 KBaud can be optionally supported. Both programs
Audio, Video and Auxiliary Data Packets PES Streams are multiplexed with Basic Service Data to indicate
their respective Service Names. If two programs are active, the two transport streams are multiplexed
into a single multi-program stream. The stream can be optionally scrambled with AES scrambling system
to provide protection in sensitive applications. User selections for all transport stream ID numbers and
service names are provided.
The M2TE is a complete system with Audio/Video encoders/compressors and all the required processing
to transmit the modulated signal with up to 200mW of RF over a wide variety of RF bands. External
Power Amplifiers are available to boost the signal to up to 15W (band dependent). CS’ COFDM wireless
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In development, future update