| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: emergency radio buoy has a radio module with an emergency channel and a drive channel, a transmitting antenna, power supply unit, a programmable logic integrated circuit (PLIC), a duplexer, a navigation receiver with a receiving antenna, an infrared light-emitting diode, read-only memory and configuration memory, wherein the PLIC has digital functional modules for programming synthesisers, generating signals for modulating the emergency and drive channels of the radio beacon and changing the lettering of the carrier frequency of the radio buoy and connection contacts; the emergency channel of the radio buoy has a driving generator, a first synthesiser with a generator controlled by voltage, a second synthesiser with a generator controlled by voltage, a digital-to-analogue converter, a mixer, series-connected low-pass filter, power amplifier and 406 MHz band-pass filter; the drive channel has a driving generator, a synthesiser with a generator controlled by voltage, a power amplifier and a band-pass filter.EFFECT: improved purity of the spectrum of the output signal, reduced phase noise, high accuracy of determining coordinates, shorter search time, high reliability of the radio beacon, reduced weight and size thereof.4 cl, 3 dwg |
