Method for enhancing tracking convergence of angle tracking system simulator

Abstract

The invention provides a method for enhancing the tracking convergence of an angle tracking system simulator. Through utilization of the method, cross coupling and an error accumulation can be reduced, and the convergence of an angle tracking process is improved. The method is achieved through the following technical scheme: after accurate amplitude adjustment, precision of which is better than 0.01dB, is performed on an intermediate frequency signal by a simulator signal processing unit, the adjusted intermediate frequency signal is divided into three signals, i.e., a sum signal, an azimuth sub signal and an elevation sub signal, via a demultiplexer, amplitude attenuations are performed on the three signals through the numerical control attenuators receiving an attenuation control command corresponding to simulator monitoring software, the sum signal after the corresponding amplitude attenuation directly sends to a tracking receiver, the azimuth and elevation sub signals send polarity switching respectively via 0 / [Pi] switchers under the control of the simulator monitoring software, the switched azimuth and elevation sub signals are synthesized into a difference signal in a quadrature synthesizer, the difference signal is sent to the tracking receiver, and the tracking receiver extracts an angle error signal according to the sum signal and the difference signal and sends the angle error signal to an antenna servo feedback system so that an antenna is controlled to rotate in a direction facing to a target.

Description

technical field [0001] The invention relates to a method for enhancing the tracking convergence of an angle tracking system simulator. Background technique [0002] Tracking convergence is an important manifestation of the performance index of the tracking system, and the tracking convergence is affected by the tracking coefficient k and the tracking phase error △ of the tracking system. As the deviation △k between the tracking coefficient k and 1 and the tracking phase error △ become smaller, the tracking convergence step size becomes smaller correspondingly, and the tracking convergence tends to be better; otherwise, the tracking convergence tends to be worse. The angle tracking system often has a large cross-coupling due to poor orthogonality of the azimuth and pitch signals or a long link processing time, which causes error accumulation, resulting in poor angle tracking convergence. The cross-coupling itself in the radio measurement and control system is caused by the p...

AI Technical Summary

Problems solved by technology

In the angle tracking system simulator, the controllable attenuation range of the attenuator used to control the signals of the azimuth branch and the pitch branch is not wide enough, less than 40dB, and the accuracy is not high, greater than 0.1dB, or calculated according to the tracking antenna pattern in the monitoring and processing computer The correspondence between the offset angle of the antenna and the target and the relationship between the signal amplitude of the road, azimuth branch, and pitch branch. The angle offset range of the pre-designed lookup table does not completely cover the beam width of the main lobe of the antenna, and the attenuation range that can be checked is not wide enough. Less than 40dB, the accuracy is not high, greater than 0.1dB, or the orthogonality of the quadrature synthesizer used to synthesize the azimuth branch signal and the elevation branch signal into the differential signal is lower than 90°±1°, or the attenuator is controlled Adjusting the amplitude of the azimuth branch signal and the pitch branch signal causes the phase change to be greater than ±1°, resulting in the orthogonality of the synthesized signal being lower than 90°±3°, which will cause the angle tracking system simulator to control the azimuth during the simulation angle tracking process. The pitch branch is affected when the branch amplitude is controlled, and the azimuth branch is affected when the pitch branch amplitude is controlled, resulting in cross-coupling; the angle tracking system simulator monitoring software accesses the lookup table according to the difference between the real-time antenna angle and the simulated orbit angle, And the look-up table of the offset angle between the antenna and the target calculated according to the tracking antenna pattern and the relationship between the signal amplitude of the road, azimuth branch and pitch branch to control the attenuator. The response time of the attenuator to the control command exceeds 50 milliseconds. Or the lookup table is not fine enough, the angular offset step is greater than 0.0001°, and the amplitude attenuation step of the azimuth and pitch branch is greater than 0.01dB, which will cause the accumulation of angular error signals, resulting in the error signal fed back each time is the last time or several times Information, cross-coupling and error accumulation lead to the fact that during the simulated self-tracking process, the angle error voltage extracted by the system tracking receiver cannot quickly tend to 0, so that the deviation △k between the tracking coefficient k and 1 and the tracking phase error △ cannot quickly tend to 0. If it is less than 0, the tracking system does not converge and the antenna oscillates

[0003] Before the measurement and control system performs tasks, it is hoped to have a set of angle tracking system simulator to verify the tracking performance of the system, especially at sea or where it is difficult to establish calibration facilities. If there is a set of angle tracking system simulator that can simulate the parameters of the angle tracking process, the simulation Create a corner tracking scene with small cross-coupling and small lag time and good tracking convergence, or simulate a scene with unsatisfactory cross-coupling and lag time by controlling related parameters according to reverse thinking, then you can verify the performance indicators and limit states of the system. There is no shelf product on the market that meets the above requirements, which brings a lot of inconvenience to the application of measurement and control systems, especially the application of tracking systems in special environments. Therefore, it is necessary to develop a set of angle tracking system simulators that meet the above requirements and simulate a highly realistic Corner tracking system task environment to verify the functional indicators of the entire measurement and control system and check the status of the equipment

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