Novel communication-in-motion low-profile planar antenna system

[0045] Reference figure 1 As shown, a new type of “on-the-move” low-profile panel antenna system of the present invention is a dual-array receiving/transmitting antenna system that realizes “on-the-move” on the Ku band. It is mainly composed of the following subsystems, Reference figure 1 As shown, it includes an antenna radiation system 1, a radio frequency polarization system 3, an antenna terminal mechanical drive system 4, a satellite pointing, capturing, and tracking system 5, and an indoor unit 6. The antenna radiation system 1 is connected to the radio frequency polarization system 3. The radio frequency polarization system 3 receives or transmits satellite radiation signals through the antenna radiation system 1. The antenna radiation system 1 and the radio frequency polarization system 3 are installed on the antenna terminal mechanical drive system 4 The antenna terminal mechanical drive system 4 is used to drive the antenna radiation system 1 to point to the location of the satellite. The antenna terminal mechanical drive system 4 is installed on a mobile terminal, such as on the surface of a car, a ship or an airplane. The indoor unit 6 is connected to the radio frequency polarization system 3. The radio frequency polarization system 3 is used to receive and down-convert the high-frequency antenna radiation signal and transmit it to the indoor unit 6. The indoor unit 6 is also generated by the radio frequency polarization system 3. The radio frequency polarizes the signal and radiates it through the antenna radiation system 1.

[0046] In order for the antenna radiation system 1 to accurately point to the satellite, it is necessary to perform precise mechanical control of the antenna radiation system 1 and adjust the radio frequency polarization system 3 to better receive or transmit signals. It is also equipped with satellite pointing and capturing , Tracking system 5, the satellite pointing, capturing, tracking system 5 is respectively connected with the radio frequency polarization system 3 and the antenna terminal mechanical drive system 4, by detecting the current heading and inertial information of the mobile terminal, the radio frequency radiation system and the antenna terminal mechanical The driving system 4 is controlled and adjusted to make it accurately point to the satellite.

[0047] The following is a detailed description of each subsystem:

[0048] Reference figure 1 As shown, the antenna radiation system 1 in the present invention is provided with two panel antennas, namely a first panel antenna 11 and a second panel antenna 12. The provision of two panel antennas can effectively increase the gain of the antenna and improve the signal receiving efficiency. In order to ensure that the signal will not be interfered when transmitting signals, the first flat antenna 11 has the ability to send and receive satellite radiation signals, while the second flat antenna 12 only has the ability to receive satellite radiation signals. The present invention can realize signal reception and transmission on a flat panel antenna. Compared with antennas that work independently and separately, the invention can effectively reduce the number of panel antennas and reduce the volume of the antenna system. Moreover, the flat panel antenna has the advantage of low profile. Suitable for use on mobile terminals. Although the functions of the first panel antenna 11 and the second panel antenna 12 are not exactly the same, in order to simplify the design and reduce the processing cost, the first panel antenna 11 and the second panel antenna 12 have the same structure, and in order to realize the dual antenna system Frequency band, dual-polarization duplex operation mode, refer to figure 2 Shown is a block diagram of one of the panel antennas. The first panel antenna 11 and the second panel antenna 12 both include a horizontally polarized signal transmission channel 22 for transmitting horizontally polarized signals and a horizontally polarized signal transmission channel 22 for transmitting vertically polarized signals. The vertically polarized signal transmission channel 23 allows the first and second panel antennas 11 and 12 to transmit horizontally and vertically polarized satellite radiation signals, which greatly expands the antenna transmission and signal transmission capabilities, and improves the antenna system Practicality.

[0049] More specifically, refer to figure 2 As shown, the flat panel antenna is composed of a multi-layer plate structure. This arrangement can effectively reduce the volume of the flat panel antenna and reduce the profile height of the antenna system. The flat panel antenna includes an antenna radiation layer 21 and horizontally polarized signal transmission. Channel 22, vertical polarization signal transmission channel 23, wherein the antenna radiation layer 21 is an antenna radiation array formed by a plurality of radiating units 211 arranged, the horizontal polarization signal transmission channel 22 and the vertical polarization signal transmission channel 23 respectively The radiating units 211 are connected, and each radiating unit 211 can receive satellite radiation signals, wherein the received horizontal polarization signal is transmitted to the horizontal polarization signal transmission channel 22, and the received vertical polarization signal is transmitted to the vertical polarization signal. The signal transmission channel 23, and when transmitting, the respective signals are radiated to the radiation unit 211 through the horizontal polarization signal transmission channel 22 or the vertical polarization signal transmission channel 23, wherein the horizontal polarization signal transmission channel 22 and the vertical polarization signal transmission channel 22 The channel 23 has the same structure and is used to combine or distribute the receiving and sending signals of multiple radiating units 211. The difference is that the radiating unit 211 is provided with different resonant ports, and the one connected to the horizontally polarized resonant port is horizontally polarized signal transmission The channel 22 is connected to the vertical polarization resonant port as the vertical polarization signal transmission channel 23. Since the two channels have the same structure, only one signal transmission channel will be described below.

[0050] The horizontal polarization signal transmission channel 22 or the vertical polarization signal transmission channel 23 includes a first power signal configuration layer 24 composed of more than one suspended stripline configuration layer 241, and a second power signal configuration layer 24 composed of more than one waveguide configuration layer 251. The signal configuration layer 25, the duplexer 26 and the low noise amplifier, wherein the horizontal low noise amplifier 27 is arranged in the horizontally polarized signal transmission channel 22, and the vertical low noise amplifier 28 is arranged in the vertically polarized signal transmission channel 23 , The antenna radiation layer 21, the first power signal configuration layer 24, the second power signal configuration layer 25, the duplexer 26 and the low noise amplifier are connected in sequence, and the signal output end of the low noise amplifier is connected to the radio frequency polarization System 3. The low noise amplifier is used to perform low noise amplification processing on the output signal, filter the signal, and obtain a purer signal. The duplexer 26 is equivalent to a single-pole double-switch switch for selecting whether the panel antenna is in the transmitting or receiving state. The specific working process will be described in conjunction with the radio frequency polarization system 3 below.

[0051] The number of layers of the suspended stripline configuration layer 241 and the waveguide configuration layer 251 can be adjusted according to the number of radiating units 211. This design can improve the efficiency of production and assembly of the antenna radiation system 1 and the efficiency of satellite signal combining/distribution. The stripline configuration layer 241 combines the radiation signals received by each radiating unit 211 through a suspended stripline, and the waveguide configuration layer 251 further combines the combined signals of the suspended stripline configuration layer 241 through a waveguide, and finally forms a signal output to Radio frequency polarization system 3, the floating strip line has good flexibility, and the thickness is very small, which can greatly reduce the thickness of the antenna radiating plate and realize the low profile of the antenna. The rectangular waveguide in the waveguide configuration layer 251 realizes the distribution or combination of signals The waveguide has the characteristics of low loss. The use of waveguides to distribute or combine signals to form a beam network can effectively reduce signal loss and greatly increase the accuracy of the antenna radiating plate. The present invention uses a suspended stripline configuration layer 241 and a waveguide configuration layer 251 configures or combines the radiated signals and adopts a flat-plate layered structure. Compared with traditional parabolic dish antennas, it is not only low profile, small in size and light in weight, but also combined with suspended stripline and waveguide technologies, which can not only effectively reduce The thickness of the antenna achieves a low profile, and can ensure the accuracy of the antenna and improve the performance of the system. The antenna radiation array is adopted. This structure allows the system to have grid-shaped radiating elements 211. The distance between these radiating elements 211 is small, so the angle to the star is relatively large, the power loss is relatively small, the profile height is relatively low, and the side lobe characteristics It is also better, especially suitable for use in the vehicle-mounted (or ship-borne) satellite mobile communication system, that is, "on-the-move communication". It can maintain the pointing, capture and tracking of the satellite in the driving state to ensure smooth communication and effectively improve The transmitting and receiving efficiency of the antenna terminal keeps communication smooth.

[0052] As a further improvement of the above, the suspended stripline configuration layers 241 of the two adjacent layers are connected to each other through excitation probes. The excitation probe is a coaxial TEM conversion device, and its function is to connect two adjacent suspended stripline configuration layers 241. Since the suspended stripline distributes or combines signals on the elevation plane, it needs to face two azimuths. The floating strip line of the layer is connected, and the EIRP and G/T values ​​of the system can be effectively improved by the excitation probe connection, because compared with other types of power distribution networks, this implementation has the least power loss and can improve the antenna The accuracy of the radiator.

[0053] Reference image 3 As shown, the radio frequency polarization system 3 is used to receive the satellite polarization radiation signal from the antenna radiation system 1 or send the satellite polarization radiation signal to the antenna radiation system 1. It includes a polarization receiving module and a polarization sending module, wherein the polarization The receiving module includes two receiving polarizers 31 corresponding to the first panel antenna 11 and the second panel antenna 12, a time delay module 32 and a down-converter 33 that are connected one after another, and the output end of the down-converter 33 is connected to In the indoor unit 6, the two receiving polarizers 31 are respectively placed on the lowermost layer of the first panel antenna 11 and the second panel antenna 12, and the output terminal is connected to the input terminal of the time delay module 32, and also includes binary power detection The binary power detector 56 is connected to the downconverter 33, and the input ends of the receiving polarizer 31 are respectively connected to the polarization signal output ends of the horizontal low noise amplifier 27 and the vertical low noise amplifier 28 to receive the signal When the horizontal polarization signal transmission channel 22 and the vertical polarization signal transmission channel 23 of the panel antenna receive the horizontal polarization signal and the vertical polarization signal from the satellite, respectively, the received signals from the radiating unit 211 are combined layer by layer, and After filtering and signal amplification by the horizontal low-noise amplifier 27 and the vertical low-noise amplifier 28, they are connected to the receiving polarizer 31. The receiving polarizer 31 processes and combines the horizontally polarized signal and the vertically polarized signal to combine The signal is transmitted to the time delay module 32. The time delay module 32 is used to further combine the output transmission signals of the first and second panel antennas 11 and 12, and the combined signal is down-converted to Generally, the analog signal is transmitted to the signal input terminal of the indoor unit 6.

[0054] The polarized transmission module includes a high power amplifier 34, a transmission polarizer 35, a horizontal phase shifter 36, and a vertical phase shifter 37. The signal output end of the indoor unit 6, a high power amplifier 34, and a transmission polarizer 35 Connected one after the other, wherein the output terminal of the transmitting polarizer 35 is respectively connected with a horizontal phase shifter 36 and a vertical phase shifter 37, and the horizontal phase shifter 36 and the vertical phase shifter 37 are respectively used to transmit horizontally polarized signals and Vertical polarization signal, wherein the signal output end of the horizontal phase shifter 36 is connected to the duplexer 26 in the horizontal polarization signal transmission channel 22 in the first panel antenna 11, and the vertical phase shifter 37 is connected to the first panel On the duplexer 26 of the vertically polarized signal transmission channel 23 in the antenna 11, taking the duplexer 26 of the horizontally polarized signal transmission channel 22 in the first panel antenna 11 as an example, one end of the duplexer 26 is connected to the second The power signal configuration layer 25 is connected, and the other end is connected to the horizontal phase shifter 36 and the horizontal low-noise amplifier 27 respectively. When transmitting signals, the duplexer 26 selects the signal transmission channel to connect with the phase shifter. When receiving signals, the duplexer 26 Select the signal transmission channel to be connected to the receiving polarizer 31; the duplexer 26 in the second panel antenna 12 is connected to the receiving polarizer 31. Since the second panel antenna 12 is only used for receiving signals, the duplexer 26 is used to control whether the second panel antenna 12 receives a signal. When the first panel antenna 11 transmits a signal, the duplexer 26 in the second panel antenna 12 disconnects the signal transmission. When receiving a signal, the second panel antenna 12 The duplexer 26 connects the signal transmission channel and the receiving polarizer 31.

[0055] When sending a signal, the duplexers 26 in the horizontal polarization signal transmission channel 22 and the vertical polarization signal transmission channel 23 respectively select to connect the horizontal phase shifter 36 and the vertical phase shifter 37, and the signal output terminal of the indoor unit 6 outputs The signal is amplified by the high-power amplifier 34 and transmitted to the polarizer for signal polarization, and the horizontally polarized signal and the vertically polarized signal are generated by the horizontal phase shifter 36 and the vertical phase shifter 37 respectively. The horizontally polarized signal and The vertically polarized signals are respectively transmitted to the antenna radiation layer 21 through the horizontally polarized signal transmission channel 22 and the vertically polarized signal transmission channel 23 for radiation, wherein the high power amplifier 34 is controlled by the high power amplifier controller 341.

[0056] Further, refer to Figure 4 As shown, the transmitting polarizer 35 is a square waveguide aperture polarizer. The square waveguide aperture polarizer using waveguide polarization technology has a compact and robust structure and excellent electrical performance. The polarizer 35 is connected with a polarization control motor 351, which is used to control the rotation angle of the polarizer, so as to control the polarization signal. The receiving polarizer 31 is an electronic polarizer, and the use of the electronic polarizer can effectively reduce the volume of the panel antenna and reduce the profile height of the antenna system.

[0057] In transmitting the polarized signal, the phase control of the polarized signal is very important. It needs to compensate at least the phase difference between the horizontally polarized signal and the vertically polarized signal caused by the radome 71. Therefore, the vertical phase shifter 37 is a variable phase shifter, and the horizontal phase shifter 36 is a fixed phase shifter. The variable phase shifter is composed of a phase control motor 371 and a sliding waveguide. The phase control motor 371 controls the sliding waveguide in the transmission waveguide. Position, thereby adjusting the phase of the vertically polarized signal to compensate for the phase difference caused by the radome 71.

[0058] Reference Figure 5 to Figure 11 As shown, the antenna terminal mechanical drive system 4 is used to drive and control the alignment position of the antenna radiation system 1 on the elevation plane and the azimuth plane, and includes a fixed platform 43 fixed on the mobile terminal and set on the fixed platform 43 , A horizontal rotation system 41 for driving the first and second panel antennas 11, 12 to rotate in the azimuth plane and an elevation plane driving system 42 for adjusting the angle of the panel antenna on the elevation plane. The horizontal rotation system 41 includes a rotating platform support The base 411, the rotating support platform 412, the horizontal transmission assembly 413 for driving the rotation of the rotating platform support 411, the horizontal rotation motor 414 and the horizontal rotation motor controller 415 for controlling the horizontal transmission assembly 413, the flat antenna is installed in the rotation On the supporting platform 412, the horizontal rotation motor controller 415, the horizontal rotation motor 414, the horizontal transmission assembly 413, and the rotation platform support 411 are connected in succession; the pitch driving system 42 includes a panel for driving the flat antenna to rotate in the pitch direction The pitch angle rotation mechanism 421, the pitch angle rotation motor 422 and the pitch angle motor controller 423 for driving and controlling the movement of the pitch angle rotation mechanism 421, the pitch angle motor controller 423, the pitch angle rotation motor 422, the pitch angle rotation mechanism 421 are connected one after another. The horizontal rotation motor controller 415 and the pitch angle motor controller 423 are directly controlled by the satellite pointing, capturing and tracking system 5.

[0059] Preferably, the antenna radiation system 1 and the radio frequency polarization system 3 are both arranged on the antenna terminal mechanical drive system 4. The radio frequency polarization system 3 is set on the horizontal rotation system 41. When the antenna terminal rotates on the azimuth plane, the antenna radiation system 1 and the radio frequency polarization system 3 rotate simultaneously, and the antenna radiation system 1 and the radio frequency polarization system 3 can pass through the waveguide Fixed connection, eliminating the need for cables and connecting wires, not only saves materials, but also reduces system errors due to transmission and improves the accuracy of the system.

[0060] More specifically, the rotating platform support 411 is a rotating metal ring mounted on the fixed platform 43, the outer side of the metal ring is provided with gear teeth 400, and the horizontal transmission assembly 413 includes a pulley 401 and a transmission belt 402 One end of the transmission belt 402 is installed on the pulley 401, and the other end is connected to the rotor of the horizontal rotation motor 414. The pulley 401 is provided with a transmission gear 403 that rotates synchronously with the pulley 401. The transmission gear 403 is in meshing connection with the gear teeth 400 of the metal ring. When the horizontal rotation motor 414 rotates, the rotor of the motor drives the transmission belt 402 to rotate, and the transmission belt 402 drives the pulley 401 to rotate, so that the transmission gear 403 on the pulley 401 controls the rotation of the metal ring, thereby controlling the rotation platform support 411 Rotation in the horizontal direction. This setting not only has a more even force during rotation and a more stable operation, but also controls the rotation angle of the metal ring through a unique transmission system. Compared with the general control method, the corresponding speed is faster and the accuracy is high.

[0061] More specifically, refer to Picture 11 As shown, the first and second panel antennas 11 and 12 are respectively mounted on the rotating support platform 412 through two aluminum brackets 416. The aluminum bracket 416 is provided with a ball bearing, and the rotating shaft of the panel antenna is mounted on the aluminum through the ball bearing. The mass bracket 416; the pitch angle rotation mechanism 421 includes a first pulley 111 and a second pulley 121 respectively arranged on the side of the two flat antenna shafts, and a drive wheel 424 installed on the rotor of the pitch angle rotation motor 422, the The first pulley 111 and the second pulley 121 are respectively connected to the driving wheel 424 at the same time through a belt. The driving wheel 424 drives the first pulley 111 and the second pulley 121 to rotate through the belt. The speed ratio of the first pulley 111 and the second pulley 121 is 1:1, this setting allows the two panel antennas to rotate synchronously, making the antenna pointing more accurate.

[0062] Reference Picture 10 As shown, the first flat antenna 11 is placed in front of the second flat antenna 12. This has the advantage that when the flat panel antenna is tilted, the electromagnetic beam emitted by the first flat panel antenna 11 will not be attenuated due to obstruction, and the quality of the signal transmitted by the antenna system can be guaranteed. The rotation axis of the second flat antenna 12 is higher than the rotation axis of the first flat antenna 11, that is, the second pulley 121 is higher than the first pulley 111. This design allows the two panel antennas to be pointed at high elevation angles to make the distance between the two plates closer, and when the elevation angle is low, the distance between the two plates becomes longer. In this way, when the flat panel antenna is pointed at a high elevation angle, the sidelobe level is relatively low, and when the flat panel antenna is pointed at a low elevation angle, the front panel will shield the rear panel relatively little, thereby increasing the receiving gain.

[0063] Further, the angle between the normal direction of the signal transmission/reception of the first and second panel antennas 11 and 12 and the horizontal plane is α, and α is determined according to the beam scanning range of the elevation plane. The flat panel antenna can adjust the angle of signal transmission and reception by phase shifting the signal to realize the electrical scanning of the flat panel antenna. Therefore, the present invention adjusts the phase of the radiation signal through the radio frequency polarization system 3 to control the transmission/reception signal The direction of the pre-tilt is achieved. The angle is determined according to the beam scanning range of the elevation plane. Since most satellites are located at the equator, but in the northern hemisphere in China, most satellites are in the range of 20° to 70° of the elevation plane. The antenna can scan this range more quickly, and the electric scanning method is used to pre-tilt the antenna's transmission signal, so that the angle of rotation of the panel antenna through mechanical rotation will be reduced, and the contour of the antenna rotation will be lower. Therefore, the angle between the normal direction of the transmitted/received signal of the panel antenna and the plane is α, and the pre-tilt is realized, which can effectively reduce the height of the antenna system and accelerate the scanning speed of the antenna to the satellite. .

[0064] Preferably, the angle between the normal direction of signal transmission/reception of the first and second panel antennas 11 and 12 and the horizontal plane is 41°. For the scanning center, the above-mentioned scanning range is achieved by pre-tilt and mechanical rotation. When the pre-tilt angle is 45 degrees, its profile is the lowest. However, when a 45-degree pre-tilted flat antenna is used for scanning, the sidelobe electrical The level will increase, especially for vertical polarization. For this reason, the pitch scanning of the present invention uses a 41-degree pretilt angle, which can not only meet the low profile, but also ensure the scanning range and scanning accuracy.

[0065] Reference Picture 12 As shown, the low-profile panel antenna system of the present invention also includes an antenna housing 7 for protecting the panel antenna, the radio frequency polarization system 3, and the antenna terminal mechanical drive system 4, the antenna radiation system 1, the radio frequency polarization system 3, The fixed platform 43, the horizontal rotation system 41 and the elevation plane driving system 42 are arranged in the antenna housing 7. The antenna housing 7 includes a base box 72 made of ABS plastic and an antenna cover 71 arranged on the base box 72, The antenna cover 71 includes an outer layer of the antenna cover 71 made of glass fiber and a paper honeycomb layer arranged on the inner layer of the antenna cover 71. The function of the radome 71 is to protect the entire antenna terminal so that it can work normally in the Ku frequency band. On the one hand, the attenuation of the signal should be small, and on the other hand, it can improve the cross-polarization performance, and it can be compatible with other antenna systems in the entire antenna system. Partially match.

[0066] Since the low-profile flat panel antenna system of the present invention is applied to mobile terminals, the satellite pointing, capturing, and tracking system 5 is required to continuously control the antenna system when moving, so that it can accurately align the satellite, which requires mechanical rotation of the system The direction, power and phase of the output polarized signal are adaptively controlled. The antenna terminal mechanical drive system 4 needs to control the elevation and azimuth planes of the antenna radiation system 1, which are respectively controlled by the horizontal rotation motor 414 and the elevation The angular rotation motor 422 is implemented. In the polarization system, the power and phase of the polarization signal are controlled by the high-power amplifier controller 341, the polarization control motor 351 and the phase control motor 371, and the power and phase of the polarization signal are controlled according to the position of the mobile terminal. The antenna radiation signal is adjusted.

[0067] Reference Figure 13 As shown, the satellite pointing, capturing and tracking system 5 of the present invention includes a GPS system 52 for providing the current GPS location information and GPS heading information of the antenna terminal, an inertial measurement unit 54 for providing inertial information of the moving carrier, and an inertial measurement unit 54 for detecting The power detector 56 of the size of the satellite power signal and the central processing unit 51 are respectively connected to the GPS system 52, the inertial measurement unit 54, the power detector 56 and the indoor unit 6. The central processing unit 51 also passes The data bus is connected to the horizontal rotation motor 414, the pitch angle rotation motor 422, the polarization control motor 351, and the phase control motor 371 through their respective motor controllers. The high-power amplifier controller 341 is connected through the microcomputer controller to control the antenna system. When the satellite pointing, capturing, and tracking system 5 is working, it obtains the accurate position of the satellite by acquiring GPS geographic location information, GPS heading information, inertial information of the moving carrier, and satellite power information, and controls the antenna terminal mechanical drive system 4 to the antenna radiation system 1 Make adjustments so that the first and second panel antennas 11 and 12 can accurately align the satellites. The central processing unit 51 obtains GPS geographic location information, GPS heading information, inertial information of the moving carrier, and satellite power information through the GPS system 52, inertial measurement unit 54, and power detector 56, and controls the antenna according to these information to achieve accurate satellite pointing. Suitable for low-profile antenna terminals combined with hybrid motors and electronic scanning, not only can effectively reduce costs, but also have high accuracy. It can maintain the pointing, capture and tracking of satellites while driving, and effectively improve the transmission and reception efficiency of antenna terminals , To ensure the smooth flow of communication.

[0068] Further, the satellite pointing, capturing and tracking system 5 also includes a magnetic compass 53 for providing current heading information of the antenna, and the magnetic compass 53 is connected to the central processing unit 51 to provide a continuous heading signal. When the GPS system 52 cannot detect the GPS heading information of the current moving carrier, it obtains heading information through the magnetic compass 53, and estimates the position of the satellite based on the information, so that the antenna can still point to the satellite, reducing system deviation. When recovering, the system can quickly recover to working condition.

[0069] Reference Figure 14 As shown, the specific operation process of the satellite pointing, capturing, and tracking system 5 is as follows: the satellite pointing, capturing, and tracking system 5 obtains the GPS geographic position information and GPS heading information where the mobile terminal is located through the GPS system 52, and obtains the current position information through the inertial measurement unit 54 The inertial information of the moving carrier of the mobile terminal is calculated by the Kalman filter to obtain the accurate heading information of the antenna. The Kalman filter is a set of mathematical calculation formulas, which estimate the state of a process through an iterative calculation method to make the mean square error The smallest. In each iteration of the filter, the state is re-estimated based on the measured values ​​from the GPS system 52 and the inertial measurement unit 54. The frequencies read from the GPS system 52 and the inertial measurement unit 54 are very different. GPS The system 52 is 1 Hz, and the inertial measurement unit 54 is 100 Hz. Since the Kalman filter uses a higher frequency of 100 Hz, the filter performs 100 iterations per second. Since the data read from the GPS system 52 is not obtained during these iterations, it is considered that this value is equal to the heading value provided by the inertial measurement unit 54 in the previous iteration. This process continues continuously until the new GPS data is read out.

[0070] After obtaining accurate heading information, the central processing unit 51 controls the steering of the antenna radiation system 1 and the power and phase of the antenna radiation signal through the antenna terminal mechanical drive system 4 and each motor controller in the antenna radiation system 1 through the bus interface 58. The signal parameters enable it to accurately target the satellite. After the antenna radiation system 1 accurately targets the satellite, the satellite pointing, capturing, and tracking system 5 estimates the pointing error through the maximum power algorithm and fine-tunes the antenna to achieve satellite capture and tracking. The central processing The unit 51 calculates the position and polarization of the satellite in the antenna coordinates every 10 milliseconds, and sends the data to the motor controller to control the pointing of the antenna and compensate for the inertial motion, while compensating for the inertial motion Calculate the error by the maximum power calculation method. Specifically, the maximum power calculation method is to perform a small offset near the theoretical satellite pointing position, measure the resulting power change, estimate the pointing error, and fine-tune the antenna according to the error Point to the position, and finally achieve precise pointing. Since the moving carrier needs to constantly adjust the position of the antenna during the driving process, the errors generated during the processing will continue to accumulate, as a result the antenna can only point to the theoretical position of the satellite, but cannot accurately point to the satellite . The maximum power calculation method is to correct the resulting pointing error according to the received signal power level, that is, make a small offset change in each direction axis, and then observe whether the detected power signal increases or decreases, not only in the azimuth A small amount of offset on the angle and elevation angle, and a small amount of offset in the phase shifter of the antenna, which can greatly improve the reception effect. By slightly changing the phase of the phase shifter, the electrical phase of the signal received by the flat antenna is also Corresponding changes, the error of the antenna can be estimated through the power error detected, and corrections are made so that the antenna is always aligned with the azimuth of the maximum satellite signal power, so as to achieve accurate pointing and satellite capture and tracking.

[0071] It also includes a user operation interface 8 for users to operate. The user operation interface 8 is connected to the satellite pointing, capturing, and tracking system 5 through the indoor unit 6. The user can obtain the control information of the system through the user operation interface 8. The central processing unit 51 is connected to the user terminal through the local area network, and the user controls the system and sets the parameters through the local area network. The user can directly input the relevant parameters of the satellite to be pointed through the user operation interface to control the direction of the antenna radiation system 1.

[0072] Further, when the antenna points to the satellite, the power information of the satellite detected by the power detector 56 is higher than the preset threshold determined by experiment and the satellite is locked, it is considered that the antenna is already in a safe transmitting area, and then the RF power is turned on The switch of the amplifier allows the antenna to transmit signals, otherwise the transmission is prohibited. This design can effectively avoid the influence of the antenna on adjacent satellites and improve the stability and practicability of the system.

[0073] Further, it also includes a beacon detector 57 for detecting the analog continuous, narrowband signal power of a certain satellite, and the output of the beacon detector 57 is connected to the central processing unit 51. The beacon detector 57 is used to detect the power signal of the designated satellite. After the satellite is locked, the satellite power signal detected by the beacon detector 57 can be used to more accurately align the antenna to the satellite when calculating the maximum power.

[0074] Further, it also includes a modem 55 that provides lock signals, output power, and status information, and the modem 55 is connected to the central processing unit 51. The demodulation of the satellite power signal by the modem 55 can realize the fast processing of the fast detection of the satellite signal and facilitate the realization of the satellite lock.

[0075] The above are only preferred embodiments of the present invention. The present invention is not limited to the above-mentioned embodiments. As long as they achieve the technical effects of the present invention by the same means, they should fall within the protection scope of the present invention.