The Signal Gathering And Processing System For Shipboard Equipment Based On Single-chip

Along with the computer technology widespread application, the numericalcontrol system which will be composed by the computer gradually substitutes fortraditional the simulation control system. The computer (PC machine) and theworkstation and the networking also applies the ships including the personalcomputer during driving and the management, the ship with equipment betweenelectronic installation like GPS, radar, gyro-compass and so on has variousconnection relations, makes the shipboard equipment the connection relations to bemore complex diversely. In order to solve the signal not unified problem, proposeddesigns a ships signal gathering and the processing system, the output signal for oninternational standard NMEA0183 form.On the ships the synchro and step-by-step motor quite to be widespread, thissystem is designed by these two kind of equipment signal gathering and processing.The synchro is one kind of induction-type synchronization miniature electricalmachinery, it widely uses in the display unit and the servo system, causes on themachinery mutually not connected two or the multi-root revolution axis can maintainthe same comer change automatically, namely synchronized revolving. In the synchrothree-phase simulated signal includes the axial angle information, isolates after thesignal isolation switching circuit and transforms is two sines and the cosine signalevacuations enters the axial angle/numeral switching circuit.Enters the 89C51processing these two signal AD transformation evacuation.Step-by-steps motor to call the pulse electric motor or the step electric motor, itis one kind transforms the electricity pulse as the angular displacement implementingagency.Its three-phase winding level rule is 6 enters the system gray code, thereforeto step-by-step compass the signal only to have voltage dropping resistor, distinguishthe course then delivers it to monolithic integrated circuit processing.89C51 is this system core part.It asks the counter-tangent to the synchro signaltable look-up, is avoids appearing the tangent value to appear theinfinity,360°divisions is 8 regions, only demand 0-45°counter-tangent values, according to trigonometrical function relations definite angle.To step-by-step motorsignal, looks up the gray code table, obtains the direction in 1 degree within changequantity.Obtains the signal according to the gray code change rule which the directionis increases or reduces, the preceding direction adds or reduces the direction changequantity to obtain the new direction.These two kind of signals all deliver 89C51 theserial port, waited for the position equipment gathers.The output form conforms tothe NMEA0183 form.