| Under the current WIN-T program, the US Army in partnership with General Dynamics and their team of subcontractors successfully demonstrated Satellite Communications (SATCOM) On The Move (SOTM) within the network to support mobile commanders. This demonstration was conducted as part of a formal Development Test/Operational Test (DT/OT) test event held at Fort Huachuca, Az in November 2005. This paper will discuss the SOTM terminal design, the test strategy and measured performance of both the Ku- and Ka-band SOTM terminals to validate that the Army warfighter can be served with reliable Voice over IP (VoIP) and data communications when operating OTM. The SOTM tests were used in part to assess the maturity of the WIN-T design and the performance of the design in a networked setting. Some of the more significant design drivers include antenna aperture and pedestal station keeping performance; and throughput performance. The throughput requirement of 256 kbps at the application layer (layer 3) was significantly exceeded during the course of formal DT/OT testing. SOTM testing provided a throughput rate of approximately 770 kbps at Ku-band over the Americom AMC-9 satellite operating at Ku-band and Ka-band operation through a surrogate satellite achieved throughputs of 1 Mbps and greater while the vehicles were traveling at speeds in excess of 25 mph over cross-country terrain. |