Specifications: Radar Video Recording Systems


Radar Video Recording Systems
Comfile Witness

Features

AIT's Witness system permits the total recording of radar data from a radar installation together with additional information on system settings, operator actions and display controls if desired.

The unique benefits of the Witness can best be appreciated in the light of the limitations of other approaches to recording radar The simplest method although perhaps the least satisfactory, is to photograph each screen full of information However, this means that one display must be exclusively reserved for the camera, viewing must wait until film is developed and images cannot be re-injected into the system to mention three obvious shortcomings.

A second method involves electronically converting data into a television type raster format. With this approach, images can be stored on ordinary videotape, but the resolution is poor and once again the data cannot be re-processed by the original radar equipment.

The Hindsight Witness provides interfaces for all common radar signals -trigger, video, azimuth and a heading marker. The value of this system lies in the tact that it is designed to reproduce radar data in the same format as it was recorded Processing and display systems treat a Witness recording just like live data.

The Witness reproduces the complete radar environment, from the richness of detail in the original data to the actual presentation of that information, thereby providing an unmatched resource for analysis and training.

Specifications

Inputs (Standard Unit)
Radar Trigger Level PRF Impedance	TTL or Analogue +ve or -ve pulse, 2-3OV, Quiescent level 0-0 BV 200 Hz-S kHz 75 Ohm
Radar Video Level Impedance Antenna Azimuth	Analogue +ve or -ve going, 1-7V peak-peak, Quiescent level -2V-+2V. 75 Ohms. Type 4096 pulses/rev ACP and separate ARP, differential (R5422) or +ve/ve pulse (2-30V) Rotation Rate 1-30 rpm
Ships Heading Marker Type Duration	+ve or -ve pulse, closing contact to DV. 50 uS minimum.
Audio Level Impedance Bandwidth	(2 Channels Normal, 2 Channels Hi-Fi) -8 dBv (line), -60 dBv (mid 47 kOhm unbalanced (line), 4 7 kOhms unbalanced (mid 50 Hz- 12 k Hz (normal), 20 Hz-20 kHz (Hi-Fi)
Mechanical	Inputs to the system from the radars are via cage clamp connectors Connections to the remote controller are via 9-way 0-Type connectors
Outputs (Standard Unit)
Radar Trigger Level Impedance	UL or Analogue +ve or -ve pulse, 2-14V, Quiescent level -5 - +5V. 75 Ohms
Radar Video Level Impedance	Analogue +ve or -ve going, 1 - 7V peak-peak, quiescent level -5-+5V 75 Ohms
Antenna Azimuth Type Rotation Rate	4096 pulses/rev ACP and separate ARP, differential (R54221 As recorded signal
Ships Heading Marker Type Duration	+ve or -ve pulse, closing contact to DV As recorded signal (3 PRI's min)
Audio Phones Line Bandwidth	-60 dBv to -20 dBv B Ohms unbalanced (2 Channels Normal, 2 Channels Hi-Fil -8 dBv 600 Ohms unbalanced 50 Hz-i 2k (Normal), 20 Hz-20 kHz (Hi-Fi).
Mechanical	Outputs from the system to the radars are via cage clamp connectors.
Operation Recording Time Fast Forward/Rewind time	30/60/180/240 minutes (depending one tape Iengthl Approximately 3 minutes with 180 cassefte
Tape	S-VHS Only
Controls	VCR (without System Manager). Via VCR front panel Intelligent Radar interface Via Menu Driven Front Pane
Indicators	Intelligent Radar Interface Unit. 2 line 20 character display with backlighting, DSQMInput "Health" indicator and DSQM Output "Health" Indicator
Configuration	Selectable Manual / Automatic (Available Shortly)
Time Code	Built in Time & Date recording to 1 second resolution
Remote Alarm	Contact closure to failure indicator
Built-In Test (BITE) Power Up Record DSQM Replay DSQM	Comprehensive test of the complete system Dynamic Signal Quality Monitoring of radar signals Dynamic Signal Quality Monitoring of radar signals
Option Cards
Azimuth Synchro Resolver Berger Enhanced ACP	(115V or 26V Reference) (115V or 26V Reference) (Higher Rotation Rates)
Pre-Trigger	Specification as per Trigger
Compass	Stepper Motor Compass record/replay + Log
Serial Data	Asynchronous R5232/422 300-9600 Baud. eg Ship's telegraph, helm/engine order
Parallel Data	8/16 bit TTL unbalanced with strobe, maximum lkByte/s.
Auxiliary Bufter Card	Provides buffering and outputs for a second radar display.

Additional Units
System Manager Provides automatic control of two recorders for continuous overlapping recordings to be made without operator intervention. Allows a system with two VCRs (ie Full Witness) to replay from the standby VCR while recording to the other.
Interswitch Box Allows one of a number of radars to be selected for recording. Allows recorded output to be switched to one of a number of displays.
Remote Control Provides remote control of the Witness system and the Interswitch box if fitted


	Copyright 2002 AIT Recorders Ltd.

Radar Video Recording Systems

Comfile Witness

Features

Specifications