Structure of vehicular active antenna system of mobile and satellite tracking method with the system
First Claim
Patent Images
1. A vehicle active antenna system, comprising:
- multiple groups of plural active channel sub-modules which receive satellite signals transferred to an antenna radome;
a plurality of signal power combiners which receive the satellite signals from the active channel sub-modules;
a beam forming block which distributes the satellite signals from the signal power combiners form a secondary beam, couples the signal power, and transmits satellite reception signals, angle control signals and a supply power in a relative rotation state of a fixed part and a rotating part to a rotary jointer which is not opened and continuously transmits and supplies them;
a frequency converter which converts satellite information signals from the rotary jointer into intermediate frequencies;
a satellite broadcasting receiver which provides signals which are frequency converted satellite information signals filtered by a bandpass filter;
a tracking signal converter which receives the satellite signals transmitted through the secondary beam formed in the beam forming block and detects the magnitude of the satellite tracking information signals;
a beam steering controller which transmits the satellite tracking information signals transferred from the satellite signal converter through the rotary jointer, performs calculations for forming beams for one-dimensional elevation angle control, and then calculates phase delay value codes of desired double beams assigned to a phase shifter;
an electronic compass sensor which calculates satellite tracking information signals transmitted through the rotary jointer from the beam steering control together with the information processing results of the sensed movement of the mobile, creates azimuth angles, elevation angle information and tracking speed informations, and provides three-axis posture information regarding absolute steering, a forward declination and a side declination;
a driving controller which provides the azimuth angles and speed information created in the electronic compass sensor and controls and monitors a driving motor so as to control one-dimensional azimuth angle;
a power supply module which supplies power from the vehicle power supply to each part of the system; and
a rotation platform which receives the power from the power supply module through the rotary jointer and controls one-dimensionally the azimuth angle of the active antenna by the driving motor.
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Abstract
This invention relates to a structure of an active antenna system of a mobile and a satellite navigation method using the system. The present invention provides a structure of an active antenna system of a mobile and a satellite tracking method using the system, in which beams are formed and then directed by using sub-array concept, the tracking accuracy becomes to high by using double beam satellite tracking mode for tracking the satellite, tracking loss is reduced and positions are more accurately tracked during movement using an absolute steering sensing mode.
72 Citations
9 Claims
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1. A vehicle active antenna system, comprising:
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multiple groups of plural active channel sub-modules which receive satellite signals transferred to an antenna radome; a plurality of signal power combiners which receive the satellite signals from the active channel sub-modules; a beam forming block which distributes the satellite signals from the signal power combiners form a secondary beam, couples the signal power, and transmits satellite reception signals, angle control signals and a supply power in a relative rotation state of a fixed part and a rotating part to a rotary jointer which is not opened and continuously transmits and supplies them; a frequency converter which converts satellite information signals from the rotary jointer into intermediate frequencies; a satellite broadcasting receiver which provides signals which are frequency converted satellite information signals filtered by a bandpass filter; a tracking signal converter which receives the satellite signals transmitted through the secondary beam formed in the beam forming block and detects the magnitude of the satellite tracking information signals; a beam steering controller which transmits the satellite tracking information signals transferred from the satellite signal converter through the rotary jointer, performs calculations for forming beams for one-dimensional elevation angle control, and then calculates phase delay value codes of desired double beams assigned to a phase shifter; an electronic compass sensor which calculates satellite tracking information signals transmitted through the rotary jointer from the beam steering control together with the information processing results of the sensed movement of the mobile, creates azimuth angles, elevation angle information and tracking speed informations, and provides three-axis posture information regarding absolute steering, a forward declination and a side declination; a driving controller which provides the azimuth angles and speed information created in the electronic compass sensor and controls and monitors a driving motor so as to control one-dimensional azimuth angle; a power supply module which supplies power from the vehicle power supply to each part of the system; and a rotation platform which receives the power from the power supply module through the rotary jointer and controls one-dimensionally the azimuth angle of the active antenna by the driving motor. - View Dependent Claims (2, 3, 4)
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5. A satellite tracking method using an active antenna system of a mobile, said method comprising the steps of:
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performing open loop tracking using an electronic compass sensor in an initial satellite tracking after initialization of the system and then tracking an initial position of the satellite; confirming first whether signals are detected as a result of the initial satellite position tracking; performing repeatedly an automatic antenna measurement tracking which applies a double beam satellite tracking as a closed loop tracking if any signal is not detected after confirming detection of a primary signal and the position of the satellite is captured; stopping an operation in an emergency based on a determination of a user if any signal is not detected after confirming detection of the primary signal; confirming secondly whether the signals are detected; performing repeatedly a satellite tracking as an open loop tracking which applies an electronic compass sensor if any signal is not detected after confirming secondly the signal detection and thus the satellite tracking has failed; proceeding to the automatic antenna measurement tracking step if the signals are detected after confirming secondly the signal detection and thus the satellite tracking is succeeded; confirming thirdly whether the signals are detected, proceeding to an automatic antenna measurement tracking step if any signals is not detected after confirming thirdly the signal detection; and proceeding to the initial satellite tracking step if any signals is not detected after confirming thirdly the signal detection and thus the satellite tracking is failed. - View Dependent Claims (6, 7, 8, 9)
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Specification