Advanced VLF Modulator

Product category :Naval Systems

Very Low Frequency (VLF) is the means of long-range reliable communication from Indian mainland to distributed ships and submerged submarines. Indian Navy established a VLF Transmitting station at INS Kattabomman for this purpose. Limited bandwidth of the large transmit antenna is a major challenge in achieving enhanced information transfer rate over this link. Advanced VLF Modulator system is a solution to this challenge which is able to achieve reliable text data communication up to 400 bps in a very limited bandwidth by use of modern communication signal processing techniques

FEATURES

VLF Frequency Band – 10-30 kHz
VLF User Throughput – 400 bps in Bandwidth of 200 Hz
Adv Modulation – GMSK (BT=0.25)
Efficient FEC – High code rate LDPC
TEXT compression – Lossless, 1st order Huffman based
Secrecy – Online
Compatible in Legacy modes
Data Interface – Serial/Ethernet
User Menu – Soft-key Controlled
Deployment- Kattabomman
Form Factor – 2U height, 19” rack mountable

TECHNICAL SPECIFICATIONS

Frequency Range : 10KHz – 30KHz (VLF Band)
Type of Operation : Simplex
Frequency Resolution : 1Hz
RF Output Level : Configurable form menu (0.1Vrms-1.5Vrms)
Data Transfer Rate
- VLF Mode : 50 Baud to 400 Bauds (Configurable No of Channels)
Modulation : GMSK, MSK
Forward Error Correction : LDPC/ Viterbi/ Wagner
EMC/EMI : 461E
Input Power Supply : Universal AC Mains (90V to 260V, 47 to 440 Hz)
Environmental : As per JSS55555:2000 Revision No. 2(Class L1)