35 results about "Step tracking" patented technology

The invention discloses an intelligent control system for a portable satellite antenna and a method, wherein the method comprises the steps of initializing an antenna; controlling the antenna through an antenna main control module to search; reading satellite signal level data transmitted by a receiver module at a certain frequency; regulating the direction and the pitch angle of the antenna to the direction and the pitch angle corresponding to the maximum satellite signal level data; adopting a step tracking way to regulate the direction and the pitch angle of the antenna; controlling motors to carry out regulatiion by a step in the current direction by the antenna main control module if the regulated level data of the current time is larger than the level data obtained after the last regulation; and controlling the motors to carry out regulation by a step in the opposite direction by the antenna main control module until the antenna receives the maximum signal level if the regulated level data of the current time is less than the level data obtained after the last regulation. The invention can ensure that the efficiency and the accuracy of star pairing can be enhanced; the star pairing time is saved; and the star pairing operation is simplified.

The present invention relates to a satellite tracking antenna system and a satellite tracking method. Step tracking in which the size of a satellite signal sampled in at least one position in which a reflector of the satellite tracking antenna system is tilted is compared to track a satellite is performed, and a measured value of the satellite signal sampled in a specific position in which the reflector is tilted in N-lth tracking and a measured value of the satellite signal sampled in the specific position in which the reflector is tilted in Nth tracking are averaged to compute a value. The reflector is driven according to the value to track the satellite, thereby minimizing a satellite tracking error caused by a sudden movement of a mobile body equipped with the satellite tracking antenna system.

An antenna controller mounted on a movable body is provided for controlling antenna driving for satellite tracking. The antenna controller comprises a step tracking circuit for performing step tracking operation on a turning face of the movable body while receiving electromagnetic waves from a satellite, and for calculating an antenna pointing direction in which an intensity of the electric wave is strongest. An antenna driving circuit drives the antenna in the antenna pointing direction, while a reference output correcting circuit adds a correction quantity to a reference output of a rate sensor based on a result of the step tracking operation.

The invention discloses a method and a device for seeking stars by using a satellite antenna. The method comprises the steps of: S1, judging that the antenna is in an unfolded state or a folded state; S2, if the antenna is in the folded state, controlling a main reflecting surface of a pitching motor driving antenna and a feed source supporting rod to be lifted to the preset positions by using a control system, installing side lobes and carrying out the step S3; if the antenna is in the unfolded state, directly carrying out the step S3; S3, reading the data of an inclinometer and calculating the pitching state of the antenna according to the data by using the control system; S4, initializing the direction state of the antenna by using the control system; S5, rotating the main reflecting surface of the antenna to the working position by using the control system; and S6, carrying out satellite search and step tracking by using the control system. The invention achieves the purpose of accurate star seeking by adopting the control system for control the polarization, the direction and the pitching of the satellite antenna and solves the problems of complicated operation, instable performance and low star-matching speed of the satellite antenna in the prior art.

The present invention discloses a double-reflecting surface satellite antenna rotation missing area tracking system and method for solving the problems existing in the automatic tracking system of a satellite antenna. The system comprises a main reflecting surface, a sub-reflecting surface, and a feeding source wherein the main reflecting surface is provided with a servo tracking unit and a main control unit. The main reflecting surface, the sub-reflecting surface and the feeding source are arranged concentrically with either the main reflecting surface or the sub-reflecting surface capable of rotating around an axis and provided with a rotation mechanism; the rotating main reflecting surface or the sub-reflecting surface is provided with a signal local failure region in a biased manner. Compared with step tracking, the system and the method of the invention has high precision and responds quickly. In contrast with cone scanning and tracking, the main reflecting surface and the sub-reflecting surface are coaxially arranged, which reduces the side lobe, interference from adjacent star and increases the applicability. Compared with mono-pulse, through the use of a signal local failure region for rotation and biased signals, it is possible to obtain sinusoidal like signals whose type and strength change periodically. Simple in structure, the manufacturing cost of the system is also low.

The present invention discloses a medical sequence image motion estimation method based on the generalized fuzzy gradient vector flolw field, it includes the following steps: 1. obtaining and sequence image; 2. obtaining generalized fuzzy gradient vector flow field of double-step tracking model, and locak correlation of generalized fuzzy gradient vector flow field and optical flowvector field; 3. manually drawing the outline of edge of interested zone of first frame image; 4. under the action of three kinds of external force fields using said double-step tracking model to frame-by-frame track the drawn edge outline of interested zone; 5. combining the above-mentioned tracking result of outline, and using maximum posteriori estimation to make optimizational estimation and tracking of every point on the outline so as to obtain the optimum motion track of the point.

The invention discloses a moving carrier signal receiving system, comprising an antenna (10), a mounting base (2), an absorber (3), a cross rolling axis frame (13), a pitch axis frame (9), an azimuth axis frame (17), three sets of direct current brushless torque motor reduction gears, three piezoelectric gyroscopes, three photoelectric encoders, a sensor, a position and posture measuring system and the like. According to the system, a three-axis structure including the pitch axis, the cross rolling axis and the azimuth axis is adopted, a tracking mode of stepping tracking is adopted, and the embedded system development technology, the driving and control integrated technology and the multimoding intelligent control algorithm are utilized, so that the high stability and tracking feature are achieved. The disturbance of the moving carrier to a satellite receiving antenna is isolated, the stable orientation of the satellite antenna in the moving process is maintained, so that the requirement of receiving satellite signals in the wild or a long journey is met, and the moving carrier signal receiving system is particularly applicable to vehicle-mounted systems and shipborne systems with complex work environments.

The invention discloses an environment emergency simulation drilling system based on the VR technology. The environment emergency simulation drilling system is mainly composed of a three-dimensional scene implementation system, a step tracking subsystem, a smoke thermal simulation subsystem, a body sign remote measurement and poison gas detection subsystem and a control and display subsystem. The environment emergency simulation drilling system based on the VR technology has the advantages of being close to emergency demand, convenient in human-computer interaction, simple and convenient in equipment configuration, customizable in scene and scientific in assessment system so that parallel simulation can be realized.

The invention discloses a scale adaptive target tracking method based on a fast compressive tracking algorithm. Firstly, a context model is used to weight a quasi-Haar feature, and the robustness of the quasi-Haar feature towards illumination changes is enhanced; then, stepped tracking is adopted, the anti-blocking ability of the algorithm and the ability of the algorithm handing the target scalechanges are enhanced, and the real-time performance of the algorithm is also kept; and finally, a scale adaptive method is put forward, and stable tracking on the scale change target is realized. Goodrobustness is achieved in conditions of target scale change, target appearance change and target being blocked, the frame frequency can be ensured to be about 39 frames per second, and requirements of real-time performance are met.

The invention provides a movable type VSAT antenna tracking method. In the antenna beam range, by means of a sine wave scanning mode, the orientation adjusting direction and size are determined according to the size relation of positive and negative half-cycle AGC level mean values. When the antenna electrical boresight is aligned with the center of the lobe, the difference of the positive and negative half-cycle AGC level mean values is approximately zero to be taken as the basis for aligning with a satellite. No additional hardware circuit needs to be added on the basis of the original stepping tracking hardware, the cost is low, and the method is simple and easy to realize, and the random interference can be effectively eliminated by the error signal obtained by the difference of the positive and negative half-cycle AGC level mean values in the same frequency and phase of the scanning frequency. According to the invention, the tracking error size and direction can be directly solved, and the misoperation of a system is reduced.

The invention discloses an automatic reception and control system for forest fire monitoring. The system comprises a step tracking receiver, an antenna control module, an antenna driving module, a shaft angle encoder and an execution module arranged on an antenna pedestal. The output of the step tracking receiver is connected with the antenna control module; the output of the antenna control module is connected with the antenna driving module; the output of the antenna driving module is connected with the execution module; the output of the execution module is connected with the shaft angle encoder; the output of the shaft angle encoder is connected with the antenna control module; and the shaft angle encoder processes the captured signals and then, transmits the signals to the antenna control module, and is used for position display and position control of the antenna. The system has the advantages of being good in monitoring timeliness, reliable and high in precision, and improving target tracking capability of the antenna.

The invention discloses a compound tracking method for an airborne satellite communication antenna. It calculates the theoretical angle of aiming at the target according to the GPS and inertial navigation data provided by the outside, and then adopts the compound tracking method of guiding and superimposing steps to obtain the angle deviation that needs to be corrected, and the superposition needs to be corrected on the basis of the calculated theoretical angle The angular deviation of the antenna can realize the real-time tracking of the satellite. It avoids the problem that the single digital guidance tracking will cause the antenna to fail to follow the maximum point of the signal due to inertial navigation drift, calibration errors, etc., thereby improving the tracking accuracy of the servo and ensuring the stability of the communication link.

The invention provides a control parameter debugging method and device for a servo control system in a non-step tracking state. The method comprises the following steps: determining a to-be-debugged control parameter when the servo control system is in the non-step tracking state; initializing a numerical value of a tracking proportional item as data obtained by tracking loop simulation of the servo control system, increasing the numerical value of the tracking proportional item until a wave gate of the tracked target shakes, and taking the numerical value of the tracking proportional item at the moment as a tracking proportional intermediate item; the relative deviation is gradually reduced by debugging the numerical value of the tracking integral item, and when a preset condition is met, the numerical value of the tracking loop integral item of the servo control system is determined as the numerical value of the tracking integral item. The method shortens the debugging time of the tracking loop, improves the debugging precision of the tracking loop, reduces the debugging workload, and is of great significance to batch production of the servo stabilized platform.