You are here

Lightweight AEHF Modem for Manpack

Description:

OBJECTIVE: Develop a lightweight, low power, AEHF modem. This would be used for a terminal that can provide AJ and LPD communications capabilities for dismounted forces (Air Control Party (TACP) and Special Operations Forces (SOF)). DESCRIPTION: A terminal that can provide AJ and LPD communications capabilities for dismounted forces (TACP and SOF) is a serious technical challenge. These dismounted troops typically carry over 100lbs of gear and cannot accept more weight than they already carry. These dismounted forces need data rates in the 100"s of kbps using equipment that is less than 16 lbs including the battery. They typically operate on a 10-1-1 duty cycle where 10 hours is idle/standby, 1 hour receive and 1 hour transmit. A small lightweight, low power modem that can operate on the AEHF satellite in clear weather at 256kbps is a serious technical challenge. AEHF is a complex, high speed, interleaved, spread spectrum, frequency hopped system. Creating a modem with the requisite processing speed while simultaneously meeting the size, weight, and power constraints of a man pack terminal is required. The AEHF capable modem must weighs less than 0.1lbs and consumes less than 1.1W in operation. In addition, it cannot consume so much power that the overall system cannot meet the 10-1-1 duty cycle. The modem should support the following modulation types: Frequency Shift Keying (FSK), Filtered Symmetric Differential Phase-Shift Keying (FSDPSK), Gaussian Minimum Shift Keying (GMSK), and PGMSK. It should support rate 1/2 encoding, symbol repeat, time permute, frequency permute, and data interleaving/deinterleaving. The modem should support a channel bandwidth of at least 20 MHz. The government can provide additional implementation details upon contract award. The overall goal of this effort is to design, then build and demonstrate an AEHF modem that meets the size, weight and power goals. The demonstration will be conducted with a satellite simulator. PHASE I: Conduct a design study for an AEHF capable modem that weighs less than 0.1lbs and consumes less than 1.1W in operation. Modem must be capable of operating in all AEHF modes. PHASE II: Prototype and demonstrate an AEHF capable modem that meets the size, weight and power requirements. This demonstration will be conducted over an AEHF satellite simulator. PHASE III: While direct application of an AEHF modem has little commercial value, the technology and ability to create a very small and efficient high capacity modem is applicable to the emerging commercial Ka SATCOM community. REFERENCES: 1. Einhorn, Arthur; Miller, Jim; ,"Spectrum Management Issues Related to the AEHF System,"Military Communications Conference, 2007. MILCOM 2007. IEEE, vol., no., pp.1-7, 29-31 Oct. 2007. 2. Mortazavi, M.; Fizell, W.; ,"Bandwidth efficient channel spacing for on board processing satellite communications-simulation results,"MILCOM 2000. 3. 21st Century Military Communications Conference Proceedings , vol.2, no., pp.1099-1103 vol.2, 2000.
US Flag An Official Website of the United States Government