Channel plans A and B provide adequate protection; Channel plan C is subject to heavy impact on the VDE from voice; As long as the duty cycle is kept to a minimum VDE communications should not VDE resilience to VHF Can the VDE withstand VHF impact voice. Channel plan D is a voice communications interference? duplex channel allotment for VDE, and the studies show that compatibility between the lower leg of these four channels being used for ship-to-shore transmitting and channel 1027 being used for simplex voice could be achieved. All channel plans must coordinate AIS VDE interference VDE resilience to AIS transmissions. between AIS and VDE. Impact of VDE communications to the No impact for all proposed channel VDE ship-to-ship / AIS probability of detection and plans. AIS interference capacity. TABLE 1 (continued) Ship Aspects Observation Description Criteria Channel plans A and D may not accommodate satellite downlink during ship-to-ship Amount of VDE-SAT downlink communications. Channel plans B VDE ship-to-ship VDE-SAT capacity that is taken away by VDE and C satellite downlink do not downlink interference ship-to-ship communications. impact ship-to-ship communications. Regional channel used of plan D conflicts with part of satellite link. Satellite uplink and AIS probability VDE-SAT uplink impact on Impact of VDE-SAT uplink to AIS of detection may only be affected AIS probability of detection and capacity. by VDE-SAT downlink on channel plans A, B and D. Channel A, B and D may VDES box complexity Design, testing and certification. require sharing with satellite if – required, this will drive complexity. Satellite Aspects Observation Description Criteria
VDE resilience to VHF voice communications Can the VDE withstand VHF interference? Channel plans A and B provide adequate protection; Channel plan C is subject to heavy impact on the VDE from voice; As long as the duty cycle is kept to a minimum VDE communications should not impact voice. Channel plan D is a duplex channel allotment for VDE, and the studies show that compatibility between the lower leg of these four channels being used for ship-to-shore transmitting and channel 1027 being used for simplex voice could be achieved. AIS VDE interference VDE resilience to AIS transmissions. All channel plans must coordinate between AIS and VDE. VDE ship-to-ship / AIS interference Impact of VDE communications to the AIS probability of detection and capacity. No impact for all proposed channel plans. TABLE 1 (continued) Ship Aspects Criteria Description Observation VDE ship-to-ship VDE-SAT downlink interference Amount of VDE-SAT downlink capacity that is taken away by VDE ship-to-ship communications. Channel plans A and D may not accommodate satellite downlink during ship-to-ship communications. Channel plans B and C satellite downlink do not impact ship-to-ship communications. Regional channel used of plan D conflicts with part of satellite link. VDE-SAT uplink impact on AIS Impact of VDE-SAT uplink to AIS probability of detection and capacity. Satellite uplink and AIS probability of detection may only be affected by VDE-SAT downlink on channel plans A, B and D. VDES box complexity Design, testing and certification. Channel A, B and D may require sharing with satellite – if required, this will drive complexity. Satellite Aspects Criteria Description Observation