| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: navigation signal transmitter acts for reception of the transmitted wave, for synchronisation pulse generation in synchronisation with definite data frame, for generation of the main oscillation of internal clock signal using section (550) of reference signal synchronisation using synchronisation pulse as reference signal, for generation of IMES signal based on the main oscillation of the internal clock signal and for IMES signal transmission. Section (550) of reference signal synchronisation contains counter circuit (551), comparator (553), LF control filter (554), digital-analogue converter (DAC) (555) and voltage controlled oscillator (556). Section (550) of reference signal synchronisation is configured so that when ratio of values between number of clock pulses generated by voltage controlled oscillator (556) using synchronisation pulse as the reference signal and reference value is in range of the preset value and continues preset number of times in one direction, then it sets level of the controlled voltage of the voltage controlled oscillator (556).EFFECT: reduced frequency drift of the navigation signal transmitted under surface conditions with low expenses.10 cl, 12 dwg |
