| 摘要 |
PURPOSE:To improve the tracking accuracy by detecting an error signal at each bit of one frame of PN, storing it after A/D conversion,. correcting the PN at each bit corresponding to the next PN frame and repeating the series of operation at each frame. CONSTITUTION:If a difference between an instantaneous angular frequency of a hopping pattern of a carrier of a transmitter and an instantaneous angular frequency of an oscillation signal of a VCO113 by hopping pattern generated in a receiver is deviated from an intermediate frequency omegai because of temperature drift and nonlinearity of DA and VCO between a transmitter and a receiver, an error signal is produced at an output of a multiplier 12. A value of a period having a horizontal trapezoidal wave in the hopping pattern in an error signal is detected by a processor 14 as to each bit, AD conversion is applied and stored in a control section 17. The value is operated by the control section 17 at the next PN frame to apply correction to the PN data and a PN generator 19 generates a PN whose frequency is corrected. The data is refreshed at each frame. |
