Technical Description

Transcription

1 irig Multi Band Digital Receiver System Technical Description Page 1

2 FEATURES irig Multi Band Digital Receiver System The irig range of telemetry products are the result of a multi year research and development program to utilize the latest technologies and apply them to products for the flight test industry. The concepts behind the products are original resulting in products designed from the ground up to offer substantial technical advantages over traditional products. The VuTrack irig Digital Receiver unit is a compact high performance receiving system. It includes a dynamic Post-Detection Diversity Combiner, with programmed IF and Video Filters. Multiple RF channels can be included in a single unit, up to 10 per chassis. Multi-Band Receiver A single receiver that covers L, Upper L, S and NATO bands with exceptional performance with all demodulation types, FM (ARTM TIER0), AM, and optionally SOQPSK (ARTM TIERI) or Multi- H CPM (ARTM TIERII) Page 2

3 Complete Receiver - RF to Time Tagged Decommutated Data An integrated solution which accepts RF signals and delivers both base band clock and bit synced data with support for derandomization from 9 to 23 bits and time tagged decommutated data. Trellis Demodulation in all ARTM Modes ARTM Tier 0 and optionally Tier I and Tier II with trellis detection in all modes. Minimum 3.5 db Improvement in PCM/FM Performance Improved BER performance through the use of a digital multi-symbol demodulator offering 3.5 db better performance over the best single-symbol demodulators. Resulting in reception to within 0.8 db of the theoretical limit. Enhanced Synchronization Synchronizes faster than a traditional bit sync, maintains sync at lower signal-to-noise ratios and offers much more accurate bit lock indication. Multiple Preset Memory Storage The receiver offers eight memory setup registers which can be preprogrammed with receiver setups and selected in flight via a three line open collector interface, compatible with a simple rotary switch. Integrated Time IRIG A, B and E time decoder, GPS time decoder with 1PPS and IRIG A, B and E time generator. Telemetry Encoder The receiver has an integrated NRZ-L/M/S, BIO-L/M/S, RNRZ 9/11/13/15/17/19/21/23 telemetry encoder that offers speeds up to 15 Mbits/Second. Ethernet Interface The receiver has an Ethernet programming, monitoring, soft decommutation data recovery and encoder data interface with advanced Windows based control and monitoring software. Status Indicator Lines The receiver offers an open collector status line that can be used to illuminate a cockpit indicator to indicate good data reception. Speech Audio Status The receiver contains a voice audio system that can be set to speak the receiver settings on changing a memory preset, to provide speech based reception status on open collector switch closure or generate user programmable tones based on reception status. OPTIONS Spectrum Display Unit Page 3

4 Full Oscilloscope Eye Diagram Display irig DIGITAL RECEIVER APPLICATIONS Applications include: Aircraft testing and evaluation. Video reception from RPV/UAV vehicles. Unmanned telemetry sites requiring complete computer control. Mobile tracking and data systems. AM Tracking Receiver. Signal Analysis. Satellite TT&C. Satellite image reception. Low Earth Orbit (LEO) satellite data collection. Page 4

5 The irig Digital Receiver leads a new generation of receiver products from JDA offering state-ofthe-art performance in a compact, easy-to-use form factor. irig DIGITAL RECEIVER REDUCES Required Rack Space. Cabling signal loss (with IF sections remote). Power consumption. Rack wiring problems. Cost. Total Weight. Remote control complexities. Spares Requirements. Maintenance issues. TUNER The tuner covers L, Upper L, S and NATO bands, that is the frequencies bands MHz, MHz and MHz converting the recovered signals to 70 MHz. The center frequency can be selected with a resolution of 50 khz by remote control. For other frequency ranges contact JDA. AM detection is provided after the 2nd IF filters, providing excellent adjacent channel rejection. The AM frequency response is determined by selection of the AGC time constant and the IF bandwidth. Individual AM outputs are provided for each tuner as an option to the standard configuration. Envelope AGC is derived from a peak AM detector with user selectable time constant settings. A user programmable damper control is provided for each RF Section, which is controlled through the remote digital interface or by the front panel. AGC and AM monitor outputs are provided in both analog and digital form. A manual zero adjustment is programmable through the remote digital interface. Additional scalable signal strength record outputs are provided. PHYSICAL SPECIFICATIONS Input power supply Altitude: Vibration limit Shock, pulse Operating Temp Storage Temp 96Vac to 230Vac 50Hz to 60Hz 100 watts 0 to 10000m 2 G 40 G, 11 msec Better than -20 to 70 deg C Better than -40 to 90 deg C Page 5

6 Operating Humidity 0 to 95% non-condensing Rack-mount option.retma rack slides (length 22 ) Height 3.5" (8.91 cm) (2U) or optionally 7" (17.82 cm) (4U) with built in monitor. Both with extra keyboard and mouse draw if required Width 19" (48.4 cm) Depth 50 cm excluding connectors Weight 10 Kg TUNER SPECIFICATIONS Frequency Ranges Standard Second IF Center Frequency AM Output Level Receiver LO Stability AGC Type AGC Time Constants Receiver Tuning Resolution Manual Gain and Offset Noise Figure Image Rejection Input Impedance VSWR Operating Dynamic Range Maximum Input IF Rejection Spurious Rejection Absolute Sensitivity IF Bandwidths MHz MHz MHz 70 MHz 2 Vp-p into 75 ohm for 50% modulation Better than ±1.0 ppm Envelope User selectable 50 khz Variable by digital control 5 db Typical Better than 60 db 50 ohms (unbalanced) 1.5:1 typical Threshold to +20 dbm +20 dbm 70 db min., 80 db typical 60 db < -120dbm 4 User selectable FIR installed on plug in modules that can be interchanged by the user DIVERSITY COMBINER The irig Digital Receiver provides circuitry for diversity pre and post detection combining of the incoming signals from two units. The combining takes place at the received signal level or the combiner can be bypassed to monitor either RF input channel. When operating under normal conditions, the AGC levels from the tuner are a true measure of the quality of the received data, and combiner weighting is a direct function of these levels. The digital signal strength indicator is calibrated to within 1db and can be used as a true signal strength indicator. Both the Pre and Post Detection Combiners can provide signal improvement with equal S/N ratio inputs. Page 6

7 DEMODULATOR & BIT SYNC SPECIFICATIONS AGC Time Constant Demodulation mode NRZ-L PCM/FM Rates Rate Resolution PCM codes Bit Sync Bit error rate Unfiltered, 1mSec, 10mSec, 100mSec Tier 0 PCM/FM demodulation with multi-symbol (Trellis) detection Tier I and Tier II optionally available 10kbps to 15 Mbps 0.1 kbps NRZ-L/M/S, BIO-L/M/S, RNRZ/RNRZR-9/11/15/17/23 Within 1.0 db from theoretical Bit Sync Loop BW Programmable between 0.01% and 5.0% Bit Sync Acq Time Within 10 data transitions, SNR 10 db Output data/clock formats RS-422 Reference Stability ±1.5 ppm Video Output Level (Adjustable) 4 Vp-p nominal, 8 V pp max Video Output Impedance 75 ohms unbalanced Video Deemphasis NTSC and PAL SPECTRUM DISPLAY (OPTIONAL) This option provides advanced spectrum analyzer capabilities to the VT-RF The system allows the user to view incoming a calibrated IF spectrum. This allows the user to verify that the input signal is compatible with the receiver configuration. Additionally the system is provided with two channels of oscilloscope display with sample rates to 200 MHz (100 MHz per channel or 200 MHz combined into a single channel). This allows for the display of an EYE diagram of the received base band signal. SPECTRUM DISPLAY SPECIFICATIONS Display Span Reference Amplitude Resolution Bandwidth Video Bandwidth Inputs Markers Logarithmic User Selectable Scales to 160dbm 1 Hz to 100 MHz (selectable) +40 to -100 dbm (selectable) 1 khz to 100 MHz (selectable) 1 Hz to 100 MHz (selectable) CH1 and CH2 2 User positionable each with auto peak detect ISO-9001 Registered Gutenbergstrasse Ihlow Riepe Germany Tel: Fax: jdassoc@gmx.net Page 7

8 VT-RC-70 VT-RC-70.PSD October 2005 Specifications subject to change without notice. irigpsd/march 2009 Page 8