Abstract:
PURPOSE: A tactical data link system based on a point to multi-point network and a tactical data transmission method thereof are provided to form an improved communications system in comparison with a method using a physical layer address, thereby preventing the decrease of transfer efficiency due to a 15-bit overhead. CONSTITUTION: Tactical data link(Link-16) units(501,502,503) each have an allocated track number(TN). The tactical data link unit transmits a data packet using an IP server/client method. A gateway(504) supports connection between networks using a point-to-multipoint method through each tactical data link unit having the allocated track number and a Link-16 network. A router is connected to the gateway. The router routes the data packet from a source IP address to a destination IP address. An IP server(505) receives the data packet using a point-to-point method.
Abstract:
The present invention relates to a method for coping with GPS radio disturbance. The method comprises the steps of: receiving a GPS signal in a transmitting system from a satellite through a GPS receiver, determining whether the status of the received GPS signal is normal, and determining whether an initial GPS deception has occurred if the status of the received GPS signal is normal; using the position data of target data including the same track data as the track data of the transmitting system as the position data of the transmitting system if the initial GPS deception has occurred, setting the predetermined value of position quality included in ship data as zero, and setting the value of a GPS spoofing indicator which indicates that the initial GPS deception has occurred as one; and determining whether the value of the GPS spoofing indicator is set as one if the initial GPS deception has not occurred, and setting the value of the position quality included in the ship data as a value greater than zero if the value of the GPS spoofing indicator is not set as one. [Reference numerals] (AA) Receive a GPS signal (every second); (BB) Transmit ship data (every six seconds); (CC) Receive target data (every three seconds); (DD) GPS deception track; (EE) Normal track; (FF) Ship position = GPS data position; (GG) The initial GPS deception occurs (over 琯); (HH) Set Gpq = 0; (II) Transmit ship data where Gpq = 0; (JJ) Continue GPS deception (over 貫); (KK) Ship position = Target data position; (LL) Release GPS deception (below 貫); (MM) Set Gpq > 0; (NN) Ship position = GPS data position; (OO) Transmit ship data where Gpq > 0
Abstract:
PURPOSE: A network information restoration system of a network center station is provided to restore the channel information assigned to each terminal in the network information of a network center station. CONSTITUTION: A terminal controller receives the signal of a network center station controller. The terminal controller controls the subscription of a new channel and the change of existing channels. The network center station controller renews the network center station channel information and network information by receiving the channel information and the network information from the terminal controller and a center network transceiver. The network center station controller restores the network information of a network center station. [Reference numerals] (AA) Network center station; (BB) Network center station controller; (CC) Network center transceiver; (DD,LL,SS) No new terminal subscription and no existing terminal channel change; (EE) Request network center station channel information transmission; (FF) Transmit network center station channel information; (GG) Update the network center station channel information; (HH,MM,UU) Request network information; (II,NN,VV) Respond the network information; (JJ) Update the network information; (KK,OO,WW) New terminal subscription and existing terminal channel change available; (PP) Terminal; (QQ) Terminal transceiver; (RR) Terminal controller; (TT) New channel subscription prohibition and change prohibition; (XX) Release new channel subscription prohibition and release change prohibition; (YY) Network information restoration system of the network center station of the invention