摘要:
An apparatus that can transmit a signal enabling higher accuracy of calculating positional information is provided. A transmitting apparatus 200 transmitting a positioning signal includes an oven controller crystal oscillator (OCXO) 210 having a thermostatic oven that keeps the temperature of a quartz resonator constant and oscillates such that variation in output frequency caused by the ambient temperature change is minimized, a voltage controlled oscillator (VCO) 220 outputting a signal modulated in accordance with the signal from OCXO 210, multipliers 240 and 260, a code generator 230 outputting code patterns for respectively identifying each of artificial satellites on which the transmitting apparatus 200 is mounted to multiplier 240, a memory 250 storing a navigation message, a transmitting portion 280, and an antenna 290.
摘要:
An apparatus that can transmit a signal enabling higher accuracy of calculating positional information is provided. A transmitting apparatus 200 transmitting a positioning signal includes an oven controller crystal oscillator (OCXO) 210 having a thermostatic oven that keeps the temperature of a quartz resonator constant and oscillates such that variation in output frequency caused by the ambient temperature change is minimized, a voltage controlled oscillator (VCO) 220 outputting a signal modulated in accordance with the signal from OCXO 210, multipliers 240 and 260, a code generator 230 outputting code patterns for respectively identifying each of artificial satellites on which the transmitting apparatus 200 is mounted to multiplier 240, a memory 250 storing a navigation message, a transmitting portion 280, and an antenna 290.
摘要:
Système de synchronisation d'un dispositif de pointage satellitaire utilisant l'émission d'un signal de synchronisation satellitaire dans un ensemble d'intervalles temporels contigus caractérisé en ce qu'il comporte des premiers moyens de sélection d'au moins deux intervalles temporels appartenant à l'ensemble. Le système comporte aussi des deuxièmes moyens de sélection d'au moins deux fréquences d'émission distinctes, chaque fréquence d'émission étant associée à un desdits intervalles temporels sélectionnés. Enfin le système comporte des moyens (103) de modulation du signal de synchronisation dans les intervalles temporels sélectionnés en utilisant la fréquence d'émission respectivement associée à l'intervalle temporel et des moyens de démodulation du signal de synchronisation reçu.
摘要:
An apparatus that can transmit a signal enabling higher accuracy of calculating positional information is provided. A transmitting apparatus 200 transmitting a positioning signal includes an oven controller crystal oscillator (OCXO) 210 having a thermostatic oven that keeps the temperature of a quartz resonator constant and oscillates such that variation in output frequency caused by the ambient temperature change is minimized, a voltage controlled oscillator (VCO) 220 outputting a signal modulated in accordance with the signal from OCXO 210, multipliers 240 and 260, a code generator 230 outputting code patterns for respectively identifying each of artificial satellites on which the transmitting apparatus 200 is mounted to multiplier 240, a memory 250 storing a navigation message, a transmitting portion 280, and an antenna 290.