CN102412436A - Ship-borne satellite antenna system and control method thereof - Google Patents
Ship-borne satellite antenna system and control method thereof Download PDFInfo
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- CN102412436A CN102412436A CN201110195913XA CN201110195913A CN102412436A CN 102412436 A CN102412436 A CN 102412436A CN 201110195913X A CN201110195913X A CN 201110195913XA CN 201110195913 A CN201110195913 A CN 201110195913A CN 102412436 A CN102412436 A CN 102412436A
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Abstract
The invention, which relates to the satellite communication technology field, provides a ship-borne satellite antenna system and a control method thereof. According to the technical scheme in the invention, a servo mechanism for driving an antenna and a stabilization mechanism for isolating ship swing are integrated into one; the swing of the ship is sensed by depending on a high precision and high sensitivity triaxial gyro of an inertia measuring element; a servo mechanism of the antenna itself is utilized to adjust the antenna attitude at any time, so that the antenna is on a stable basis all the time; therefore, isolation of the ship swing is realized; problems of a complex structure, low tracking precision and poor tracking reliability of a traditional ship-borne satellite antenna can be solved; and a demand of emergent communication on the sea is met.
Description
Technical field
The present invention relates to technical field of satellite communication, particularly a kind of Shipborne satellite antenna system and control method thereof.
Background technology
The carrier that the difference of the maximum of Shipborne satellite antenna and ground fixed antenna is to place antenna is mobile, as a to wave hull; Thereby need the stabilized antenna platform to isolate waving of hull; Realize antenna attitude stabilization at the volley, and on the basis of attitude stabilization, in moving process, follow the tracks of and satelloid.Traditional Shipborne satellite antenna adopts mechanical platform to isolate the carrier disturbance usually, adopts hill climb system to make antenna beam progressively to satelloid.Aforesaid way has following shortcoming: the one, and adopt cost height, the precision of mechanical platform low; The 2nd, the response time of employing hill climb system is long, alignment speed is slow, and the fluctuation of satellite-signal amplitude can influence tracking accuracy; The 3rd, complicated in mechanical structure, the volume of whole system are big, also are unfavorable for the SERVO CONTROL that antenna drives.
Therefore, the key technology of Shipborne satellite antenna system is the stabilizing power and the target following ability of antenna platform.Can the motion that isolate carrier well have a fundamental influence to the attitude of antenna platform is whether stable; In addition, to guarantee that under various meteorologies, environmental condition antenna is high-precision all the time to satelloid, realize continuous satellite communication.The problems referred to above all are problems that the Shipborne satellite antenna system must solve.
Summary of the invention
The technical problem that (one) will solve
Shortcoming to prior art; The present invention is in order to solve the problem of the Shipborne satellite antenna stability of a system and follow-up control difference in the prior art; A kind of Shipborne satellite antenna system and control method thereof have been proposed; Hull attitude and the definite antenna attitude of dipmeter confirmed through three gyros come adjustment antenna in real time, thereby have improved the stability and the tracking accuracy of Shipborne satellite antenna simply and effectively.
(2) technical scheme
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of Shipborne satellite antenna system; Said system comprises air feedback unit and the Transmit-Receive Unit that is installed on the support unit; It is characterized in that; Said system also comprises: the servo control unit that is connected with said Transmit-Receive Unit with said air feedback unit, and receive the control of said servo control unit to adjust the driver element of said air feedback unit;
Said servo control unit comprises: day line traffic control slave computer and three gyros that are connected with said day line traffic control slave computer respectively and dipmeter;
Said driver element comprises: is connected with said day line traffic control slave computer and receives the motor driver of its control and the azimuth-drive motor that is driven by said motor driver, pitching motor, rolling motor and the motor that polarizes;
Wherein, When said antenna system is in hold mode; Said three gyros induction in the orientation, pitching and each current hull attitude parameter of rolling and feed back to said day line traffic control slave computer; The line traffic control slave computer was controlled said motor driver according to said hull attitude parameter in said day, drove said azimuth-drive motor, pitching motor and rolling motor by said motor driver and on each direction of principal axis, moved to keep antenna static relatively; Said dipmeter reads current antenna attitude parameter in real time and feeds back to said day line traffic control slave computer, by said day line traffic control slave computer the motion of each motor is monitored and is proofreaied and correct.
Preferably; Said servo control unit also comprises the beacon track receiver that is connected with said day line traffic control slave computer, said beacon track receiver be used for to the satellite beacon signals that antenna receives amplify, filtering and detection and feed back to said sky line traffic control slave computer with dc level signal; Wherein,
Under said hold mode, in case when the level signal of beacon track receiver feedback dropped to less than predetermined first threshold value, antenna system got into tracking mode; When signal continued to drop to less than the predetermined second threshold value, antenna system got into search condition; In search procedure, when level signal surpassed said second threshold value, antenna system got into tracking mode; When level signal surpassed said first threshold value, antenna system was in hold mode.
Preferably, said servo control unit also comprises: the electronic compass and the GPS receiver that are connected with said sky line traffic control slave computer respectively; Said electronic compass is used for confirming current hull course parameter and feeds back to said day line traffic control slave computer that said GPS receiver is used to read the geographical longitude and latitude parameter of current hull and feeds back to said day line traffic control slave computer; Wherein,
When said antenna system gets into search condition; The line traffic control slave computer calculated antenna azimuth, polarizing angle and the angle of pitch according to the current Satellite Tracking parameter of system, the geographical longitude and latitude parameter of hull, hull course parameter, antenna attitude parameter and hull attitude parameter in said day; Thereby drive the polarizing angle coupling that said polarization motor makes polarizing angle and the satellite repeater of antenna, and drive said azimuth-drive motor and/or said pitching motor makes antenna at azimuth plane and/or the enterprising line search of pitching face.
Preferably, said driver element comprises that also the awl that makes antenna carry out conical scanning sweeps motor; Wherein,
When said antenna system gets into tracking mode; At first by certain time interval; Drive said azimuth-drive motor and/or said pitching motor make antenna in azimuth plane and/or pitching face with a small angular turn, carry out stepping through the level signal strength of beacon track receiver feedback and follow the tracks of;
When level signal surpasses the 3rd predetermined threshold value; Antenna system is carried out conical scanning tracking; Said awl is swept motor and is made antenna center on rotating shaft to rotate with certain frequency; Said beacon track receiver demodulates orientation and pitch error signal to detected modulation signal, and said sky line traffic control slave computer makes the antenna alignment satellite according to the big or small control antenna of this error signal to the direction rotation that error reduces; Wherein, said the 3rd threshold value greater than said second threshold value less than said first threshold value.
Preferably, said air feedback unit is made up of antenna main reflector, subreflector, feed system and waveguide junction; Said transmitting-receiving subdivision is made up of LNB, BUC and Modem; Said support unit is made up of antenna bracing frame, antenna pedestal; Said servo control unit also comprises the DVB receiver.
Further, the present invention also provides the control method of a kind of Shipborne satellite antenna system simultaneously, and said method comprises step:
When said antenna system is in hold mode, the induction of three gyros in the orientation, pitching and each current hull attitude parameter of rolling and feed back to a day line traffic control slave computer;
Said day line traffic control slave computer drives azimuth-drive motor, pitching motor and rolling motor by said motor driver and on each direction of principal axis, moves to keep antenna static relatively according to said hull attitude parameter control motor driver;
Dipmeter reads current antenna attitude parameter in real time and feeds back to said day line traffic control slave computer, by said day line traffic control slave computer the motion of each motor is monitored and is proofreaied and correct.
Preferably, said method also comprises step:
The beacon track receiver in real time to the satellite beacon signals that antenna receives amplify, filtering and detection and feed back to said day line traffic control slave computer with dc level signal;
Under said hold mode, in case when the level signal of beacon track receiver feedback dropped to less than predetermined first threshold value, antenna system got into tracking mode; When signal continued to drop to less than the predetermined second threshold value, antenna system got into search condition;
In search procedure, when level signal surpassed said second threshold value, antenna system got into tracking mode; When level signal surpassed said first threshold value, antenna system was in hold mode.
Preferably, when said antenna system got into search condition, said method also comprised step:
The line traffic control slave computer calculated antenna azimuth, polarizing angle and the angle of pitch according to the current Satellite Tracking parameter of system, the geographical longitude and latitude parameter of hull, hull course parameter, antenna attitude parameter and hull attitude parameter in said day;
Drive the polarizing angle coupling that said polarization motor makes the polarizing angle and the satellite repeater of antenna;
Driving said azimuth-drive motor and/or said pitching motor makes antenna at azimuth plane and/or the enterprising line search of pitching face.
Preferably, when said antenna system got into tracking mode, said method also comprised step:
At first by certain time interval, drive said azimuth-drive motor and/or said pitching motor make antenna in azimuth plane and/or pitching face with a small angular turn, carry out stepping through the level signal strength of beacon track receiver feedback and follow the tracks of;
When level signal surpassed the 3rd predetermined threshold value, antenna system was carried out conical scanning tracking, drove awl and swept motor and make antenna center on rotating shaft to rotate with certain frequency; Wherein, said the 3rd threshold value greater than said second threshold value less than said first threshold value;
Said beacon track receiver demodulates orientation and pitch error signal to detected modulation signal;
Said sky line traffic control slave computer makes the antenna alignment satellite according to the big or small control antenna of this error signal to the direction rotation that error reduces.
Preferably, begin to carry out step most in said method:
Said antenna system is powering up initialization;
Drive pitching motor and rolling motor pitching, rolling diaxon are transferred to level.
(3) beneficial effect
Shipborne satellite antenna provided by the invention system has solved the problem that traditional Shipborne satellite antenna complex structure, tracking accuracy are low, follow the tracks of poor reliability; Combine the servomechanism of driven antenna and the stabilizing mechanism that the isolation ship shakes together; Rely on waving of high accuracy, three gyro induction hulls of highly sensitive inertial measurement component; Utilize the servomechanism of antenna itself to adjust antenna attitude at any time; Antenna is on the stable basis always, realizes isolating ship and shake, satisfied the demand of marine emergency communication.
Description of drawings
Fig. 1 is the servo control unit and the driver element agent structure sketch map of Shipborne satellite antenna of the present invention system;
Fig. 2 is the structural representation that further comprises search and trace component in the Shipborne satellite antenna of the present invention system;
Fig. 3 is the major control schematic flow sheet during the closed loop tracking mode in the Shipborne satellite antenna of the present invention system;
Fig. 4 is the major control schematic flow sheet during the conical scanning autotrack mode in the Shipborne satellite antenna of the present invention system;
Fig. 5 is the integral installation structural representation of Shipborne satellite antenna of the present invention system.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the present invention protects.
In the Shipborne satellite antenna of the present invention system, the problem that at first will solve provides stable antenna platform and isolates waving of hull, realizes antenna attitude stabilization at the volley.For this reason; Antenna system of the present invention combines the servomechanism of driven antenna and the stabilizing mechanism that the isolation ship shakes together; Rely on waving of high accuracy, three gyro inductions of highly sensitive inertial measurement component hull, go out system to the offset angle that ship shakes, utilize the servomechanism of antenna itself to adjust the antenna pedestal attitude at any time through coordinate transform and coupling decomposition computation; Antenna is on the stable basis always, realizes isolating ship and shake.
Be the motion of shielding ship (as rock, dipping and heaving, turn to etc.); Make antenna keep relative static conditions, the agent structure of topmost parts servo control unit of Shipborne satellite antenna system of the present invention and driver element (can close and be called the boat-carrying servomechanism) is as shown in Figure 1.Wherein, said servo control unit comprises: day line traffic control slave computer and three gyros that are connected with said day line traffic control slave computer respectively and dipmeter; Said driver element comprises: is connected with said day line traffic control slave computer and receives the motor driver of its control and the azimuth-drive motor that is driven by said motor driver, pitching motor, rolling motor and the motor that polarizes.
In the ship motion process; Three each axial acceleration of gyro sensed orientation, pitching and rolling; Degree of will speed up converts corresponding voltage into and transfers to a day line traffic control slave computer processing; The voltage control motor driver that it line traffic control slave computer transmits according to three gyros drives each motor movement by motor driver and keeps antenna static relatively to offset acceleration action, the effect that dipmeter (like code-disc etc.) then plays monitoring and proofreaies and correct motor movement; Guaranteeing that motor movement is unlikely to overrun, or in direction drift of the following day alignment of the influence of gyro.
For guarantee antenna in the orientation, pitching, three maximum decoupling zeros of rolling, reach the purpose of simplifying control, with vertical each other in twos installation of three gyros of sensed orientation, pitching, rolling rotation axis.Wherein, The gyro of sensed orientation rotation axis is installed on the backbone block (being the leveling box) of a leveling all the time, the double-shaft level appearance of induction pitching and rolling is housed, in the backbone block in the antenna initialization procedure; At first export according to level meter; Drive pitch axis and axis of roll motor, pitching, rolling diaxon are transferred to level, and remain level in the course of work afterwards.Simultaneously, leveling backbone block all the time, thereby guaranteed that traverse gyro induction axis is vertical with horizontal plane, pitching rolling gyro induction axis is parallel with horizontal plane, in the course of the work, three gyros distinguish induction antenna in the orientation, pitching and three axial variations of rolling.
Except being used for stable boat-carrying servomechanism; Shipborne satellite antenna of the present invention system further goes back control antenna satellite is searched for and followed the tracks of: at the beacon track receiver that servo control unit also comprises with day the line traffic control slave computer is connected, be used for to the satellite beacon signals that antenna receives amplify, filtering and detection and feed back to said sky line traffic control slave computer with dc level signal; Wherein, when antenna is in hold mode following time, in case when the level signal of beacon track receiver feedback dropped to less than predetermined first threshold value, antenna system got into tracking mode; When signal continued to drop to less than the predetermined second threshold value, antenna system got into search condition; In search procedure, when level signal surpassed said second threshold value, antenna system got into tracking mode; When level signal surpassed said first threshold value, antenna system was in hold mode.
As shown in Figure 2, can further comprise concrete search and trace component in the Shipborne satellite antenna of the present invention system.Search and tracking control loop equivalence are to be that input, antenna angle coordinate are the closed-loop control system of output with Satellite Angle coordinate and ship cradle angle speed; The real-time longitude and latitude of the motion hull that provides according to the GPS receiver, the angle of drift that electronic compass provides are after sky line traffic control slave computer computing, and the indication motor driver captures target satellite rapidly.After capturing satellite, utilize awl to sweep motor again and antenna is done closed loop tracking compensation, satellite is continued to follow the tracks of according to wave beam conical scanning output error signal.
The control principle of Shipborne satellite antenna of the present invention system is: antenna powers up; After initialization began, a day line traffic control slave computer was exported according to level meter, drives pitching and rolling motor; Pitching, rolling diaxon are transferred to level, and remain level in the course of work afterwards.It line traffic control slave computer is read the Satellite Tracking parameter that stores in the chip; Read the antenna attitude parameter through dipmeter; Read the geographical longitude and latitude parameter of earth station (being hull) through the GPS receiver; Confirm the course parameter of hull through electronic compass, confirm the attitude parameter of hull to calculate antenna azimuth, polarizing angle and the angle of pitch according to above-mentioned parameter through three gyros.It line traffic control slave computer control polarization motor makes the polarizing angle coupling of the polarizing angle and the satellite repeater of antenna, then, drives orientation/pitching motor according to certain automatic control algorithm, makes antenna carry out orientation/pitching search.
In search procedure; In a single day antenna receives satellite-signal; LNB in Transmit-Receive Unit (Low Noise Block; The low noise block) frequency reducing is amplified the back and is divided into two-way by L frequency range directional coupler, and one road signal is exported to L frequency range satellite beacon track receiver, and another road signal is delivered to satellite communication modulator-demodulator (this road of delivering to the satellite communication modulator-demodulator is called the receiving branch circuit at satellite communication boat-carrying station).Wherein, the beacon track receiver is accomplished amplification, filtering and the detection to satellite beacon signals, and the flat day line traffic control slave computer of giving of output DC is for control algolithm provides the signal level indication.
In the search procedure, in case the satellite beacon signals level of L frequency range satellite beacon track receiver output surpasses second threshold value that (promptly more than or equal to) sets, antenna just gets into tracking mode; Pass through tracking strategy; Make antenna receive maximum signal level, that is, and the antenna beam satellite.Then, when signal surpassed first threshold value, antenna direction was in hold mode; When signal during less than first threshold value, antenna gets into tracking mode automatically once more, and therefore, antenna direction keeps best receptivity all the time to satelloid.Behind the antenna alignment satellite, the signal that user terminal sends after BUC (Block Up-Converter, up-conversion power amplifier) frequency conversion, amplifying, is sent out to the work satellite through antenna-feedback system, can with satellite communication link is set up at logical station.
The major function flow chart that the satellite antenna closed loop is followed the tracks of is as shown in Figure 3: communication satellite emission beacon signal; This signal is used for letting earth station (being the hull among the present invention) day line following; Antenna is sent in the automatic beacon track receiver after receiving beacon signal, and a day line traffic control slave computer carries out signal processing to the output of beacon track receiver, obtains the estimation error signal that antenna departs from objectives; And adjust antenna direction with it, make the antenna alignment satellite.
In addition, the tracking system in the Shipborne satellite antenna of the present invention system is carried out based on compound tracking mode, the autotrack mode that has adopted two kinds of tracking techniques of stepping tracking and conical scanning to combine.System is slightly guided by numeral earlier; After change the spiral search stepping over to and follow the tracks of; By certain time interval; Make antenna in azimuth plane (or pitching face) with a small angular turn, the increase and decrease of satellite beacon signals incoming level is differentiated in the time of confirming through computer: if incoming level has increased, then antenna is rotated further a small angle along former direction; If incoming level has reduced, antenna will rotate in the opposite direction so.Pitch orientation and azimuth direction repeat to hocket successively, thereby make antenna beam progressively to satelloid.
After automatically star being accomplished (being that incoming level reaches a predetermined threshold value), promptly switch to feed scanning conical scanning autotrack mode, Fig. 4 has provided the operation principle of conical scanning autotrack mode: awl is swept the motor conical scanning makes antenna beam center on rotating shaft with certain frequency rotation; When satellite departs from the rotating shaft direction, receive the signal that signal has been modulated by the wave beam speed, the amplitude of modulation signal and phase place depend on that respectively satellite departs from the size and Orientation of rotating shaft; The beacon track receiver detects this modulation signal, and the orthogonal basis calibration signal that produces when rotating with wave beam carries out a series of signal processing to the modulation signal that detects, and demodulates the dc error signal at orientation and pitch error angle; It line traffic control slave computer can be according to each motor fine setting antenna tracking satellite of size control of the dc error signal at the orientation that receives, pitch error angle, and control antenna rotates to the direction that error reduces, until the antenna beam satellite.
At last, the integral installation structure of Shipborne satellite antenna of the present invention system is as shown in Figure 5: the Shipborne satellite antenna system mainly is made up of air feedback unit, servo control unit, driver element, Transmit-Receive Unit, support unit.Air feedback unit is made up of antenna main reflector 9, subreflector 10, feed system 5, waveguide junction 4; Servo control unit is made up of sky line traffic control slave computer 15, day line traffic control host computer, beacon track receiver, DVB receiver, three gyros, dipmeter, electronic compass, GPS receivers; Driver element is swept motor 11 and is formed by azimuth-drive motor 17, azimuth drive 16, pitching motor 1, elevating gear 2, polarization motor 6, motor driver 14, leveling motor 12, leveling box 13, awl; Transmit-Receive Unit is made up of LNB 3, BUC 7, Modem; Support unit is made up of antenna bracing frame, antenna pedestal 8.
It can be seen from the above, and with respect to prior art, scheme of the present invention has following outstanding substantive distinguishing features and obvious improvement:
1. systems stabilisation combines the servomechanism of driven antenna and the stabilizing mechanism that the isolation ship shakes together; Rely on waving of high accuracy, the responsive ship of highly sensitive inertial measurement component gyro; Go out the offset angle that system shakes ship through coordinate transform and coupling decomposition computation; Utilize the servomechanism of antenna itself to adjust the antenna pedestal attitude at any time, antenna is on the stable basis always, realize isolating ship and shake;
2. searching loop is input with Satellite Angle coordinate and ship cradle angle speed, and the antenna angle coordinate is the closed-loop control system of output, and the parameter that provides with each sharp transducer is a foundation, and the indication driver captures target satellite rapidly after control system is handled;
3. tracking control system has adopted the combined type autotrack mode that combines based on stepping tracking and conical scanning tracking technology; Thereby when keeping antenna to seek star speed; Improved the stability of following the tracks of, Shipborne satellite antenna is kept starlike attitude for a long time;
4. adopt double mode tracking signal reference, effectively improved the reliability of antenna tracking satellite based on beacon receiver and DVB receiver.
Therefore; Shipborne satellite antenna provided by the invention system has solved the problem that traditional Shipborne satellite antenna complex structure, tracking accuracy are low, follow the tracks of poor reliability; The digital strapdown systems stabilisation that employing is resolved based on mathematics; Based on the compound tracking mode of stepping tracking and conical scanning tracking technology, thereby improve the tracking accuracy of boat-carrying satellite communication antena, satisfied the demand of marine emergency communication.
Above execution mode only is used to explain the present invention; And be not limitation of the present invention; The those of ordinary skill in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also be made various variations and modification; Therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. Shipborne satellite antenna system; Comprise the air feedback unit and the Transmit-Receive Unit that are installed on the support unit; It is characterized in that; Said system also comprises: the servo control unit that is connected with said Transmit-Receive Unit with said air feedback unit, and receive the control of said servo control unit to adjust the driver element of said air feedback unit;
Said servo control unit comprises: day line traffic control slave computer and three gyros that are connected with said day line traffic control slave computer respectively and dipmeter;
Said driver element comprises: is connected with said day line traffic control slave computer and receives the motor driver of its control and the azimuth-drive motor that is driven by said motor driver, pitching motor, rolling motor and the motor that polarizes;
Wherein, When said antenna system is in hold mode; Said three gyros induction in the orientation, pitching and each current hull attitude parameter of rolling and feed back to said day line traffic control slave computer; The line traffic control slave computer was controlled said motor driver according to said hull attitude parameter in said day, drove said azimuth-drive motor, pitching motor and rolling motor by said motor driver and on each direction of principal axis, moved to keep antenna static relatively; Said dipmeter reads current antenna attitude parameter in real time and feeds back to said day line traffic control slave computer, by said day line traffic control slave computer the motion of each motor is monitored and is proofreaied and correct.
2. antenna system according to claim 1; It is characterized in that; Said servo control unit also comprises the beacon track receiver that is connected with said day line traffic control slave computer, said beacon track receiver be used for to the satellite beacon signals that antenna receives amplify, filtering and detection and feed back to said sky line traffic control slave computer with dc level signal; Wherein,
Under said hold mode, in case when the level signal of beacon track receiver feedback dropped to less than predetermined first threshold value, antenna system got into tracking mode; When signal continued to drop to less than the predetermined second threshold value, antenna system got into search condition; In search procedure, when level signal surpassed said second threshold value, antenna system got into tracking mode; When level signal surpassed said first threshold value, antenna system was in hold mode.
3. antenna system according to claim 2 is characterized in that, said servo control unit also comprises: the electronic compass and the GPS receiver that are connected with said sky line traffic control slave computer respectively; Said electronic compass is used for confirming current hull course parameter and feeds back to said day line traffic control slave computer that said GPS receiver is used to read the geographical longitude and latitude parameter of current hull and feeds back to said day line traffic control slave computer; Wherein,
When said antenna system gets into search condition; The line traffic control slave computer calculated antenna azimuth, polarizing angle and the angle of pitch according to the current Satellite Tracking parameter of system, the geographical longitude and latitude parameter of hull, hull course parameter, antenna attitude parameter and hull attitude parameter in said day; Thereby drive the polarizing angle coupling that said polarization motor makes polarizing angle and the satellite repeater of antenna, and drive said azimuth-drive motor and/or said pitching motor makes antenna at azimuth plane and/or the enterprising line search of pitching face.
4. antenna system according to claim 2 is characterized in that, said driver element comprises that also the awl that makes antenna carry out conical scanning sweeps motor; Wherein,
When said antenna system gets into tracking mode; At first by certain time interval; Drive said azimuth-drive motor and/or said pitching motor make antenna in azimuth plane and/or pitching face with a small angular turn, carry out stepping through the level signal strength of beacon track receiver feedback and follow the tracks of;
When level signal surpasses the 3rd predetermined threshold value; Antenna system is carried out conical scanning tracking; Said awl is swept motor and is made antenna center on rotating shaft to rotate with certain frequency; Said beacon track receiver demodulates orientation and pitch error signal to detected modulation signal, and said sky line traffic control slave computer makes the antenna alignment satellite according to the big or small control antenna of this error signal to the direction rotation that error reduces; Wherein, said the 3rd threshold value greater than said second threshold value less than said first threshold value.
5. according to each described antenna system of claim 1-4, it is characterized in that said air feedback unit is made up of antenna main reflector, subreflector, feed system and waveguide junction; Said transmitting-receiving subdivision is made up of LNB, BUC and Modem; Said support unit is made up of antenna bracing frame, antenna pedestal; Said servo control unit also comprises the DVB receiver.
6. the control method of a Shipborne satellite antenna system is characterized in that, said method comprises step:
When said antenna system is in hold mode, the induction of three gyros in the orientation, pitching and each current hull attitude parameter of rolling and feed back to a day line traffic control slave computer;
Said day line traffic control slave computer drives azimuth-drive motor, pitching motor and rolling motor by said motor driver and on each direction of principal axis, moves to keep antenna static relatively according to said hull attitude parameter control motor driver;
Dipmeter reads current antenna attitude parameter in real time and feeds back to said day line traffic control slave computer, by said day line traffic control slave computer the motion of each motor is monitored and is proofreaied and correct.
7. method according to claim 6 is characterized in that, said method also comprises step:
The beacon track receiver in real time to the satellite beacon signals that antenna receives amplify, filtering and detection and feed back to said day line traffic control slave computer with dc level signal;
Under said hold mode, in case when the level signal of beacon track receiver feedback dropped to less than predetermined first threshold value, antenna system got into tracking mode; When signal continued to drop to less than the predetermined second threshold value, antenna system got into search condition;
In search procedure, when level signal surpassed said second threshold value, antenna system got into tracking mode; When level signal surpassed said first threshold value, antenna system was in hold mode.
8. method according to claim 7 is characterized in that, when said antenna system got into search condition, said method also comprised step:
The line traffic control slave computer calculated antenna azimuth, polarizing angle and the angle of pitch according to the current Satellite Tracking parameter of system, the geographical longitude and latitude parameter of hull, hull course parameter, antenna attitude parameter and hull attitude parameter in said day;
Drive the polarizing angle coupling that said polarization motor makes the polarizing angle and the satellite repeater of antenna;
Driving said azimuth-drive motor and/or said pitching motor makes antenna at azimuth plane and/or the enterprising line search of pitching face.
9. method according to claim 7 is characterized in that, when said antenna system got into tracking mode, said method also comprised step:
At first by certain time interval, drive said azimuth-drive motor and/or said pitching motor make antenna in azimuth plane and/or pitching face with a small angular turn, carry out stepping through the level signal strength of beacon track receiver feedback and follow the tracks of;
When level signal surpassed the 3rd predetermined threshold value, antenna system was carried out conical scanning tracking, drove awl and swept motor and make antenna center on rotating shaft to rotate with certain frequency; Wherein, said the 3rd threshold value greater than said second threshold value less than said first threshold value;
Said beacon track receiver demodulates orientation and pitch error signal to detected modulation signal;
Said sky line traffic control slave computer makes the antenna alignment satellite according to the big or small control antenna of this error signal to the direction rotation that error reduces.
10. according to each described method of claim 6-9, it is characterized in that, begin to carry out step most in said method:
Said antenna system is powering up initialization;
Drive pitching motor and rolling motor pitching, rolling diaxon are transferred to level.
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