A correction in feedback loop applied to two-axis gimbal stabilization

Zych, Cezary; Wrońska-Zych, A.; Dudczyk, J.; Kawalec, A.

doi:10.1515/bpasts-2015-0025

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…The radar seeker is employed in the forward-looking mode, as a common practice. Note that the beam is steered to a low-grazing angle area to alleviate the geometry-induced range dependence of clutter in a forward-looking mode [17], and the platform's flight stability is also improved with the stabilization algorithm [18]. The velocity of radar is v a , which is along the X-axis.…”

Section: Geometric Configuration and Multipath-target Signal Modelmentioning

confidence: 99%

Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection

Liao

et al. 2021

Remote Sensing

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In this paper, an ultra-low-altitude target (ULAT) detection approach, referred to as the multi-resolution space-time adaptive processing (STAP), is proposed to enhance the target detection performance in a missile-borne radar system. In this respect, the whole base band is divided into a series of equal-width and center-frequency-diverse sub-bands with the frequency diversity technique, which enhances the multipath-target coupled (MTC) effect with the decreased range resolution. Hence, it is feasible to exploit the multipath signal power to improve the output signal-to-clutter-plus-noise ratio (SCNR) performance of sub-band STAP. In this regard, the mechanism of the MTC effect is analyzed numerically for the efficient sub-band STAP. However, such SCNR improvement is achieved at the cost of target tracking performance loss. Hence, the full-band STAP is further applied for multipath-target separation based on the target range-Doppler locations detected by the joint multiple sub-bands ΣΔ-STAP, which also alleviates the dynamic target attenuation and the corresponding target Doppler history corruption within the long coherent processing interval (CPI). On this basis, the SCNR performance is further improved by applying coherent accumulation among sub-CPIs, in which the clutter suppression performance degradation and coherent accumulation loss of STAP are alleviated within the sub-CPIs. Numerical and measured results corroborate the effectiveness of ULAT detection with the considered multi-resolution STAP.

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Section: Geometric Configuration and Multipath-target Signal Modelmentioning

confidence: 99%

Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection

Liao

et al. 2021

Remote Sensing

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“…However, the type of observer is not important in the context of the control system as a whole. There is a possibility to use an observer which estimates the position using any method: using signal injections or the observers, e.g., based on back EMF estimation, using Luenberger and modified Luenberger observers [26], based on various realizations of Kalman filter [27][28][29][30], using sliding mode observers [31][32][33] and artificial neural networks [34]. As mentioned above, the control system utilizes the Luenberger observer.…”

Section: Position Observermentioning

confidence: 99%

A new sensorless speed control structure for PMSM using reference model

Urbański¹

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In the paper a new sensorless control structure for the PMSM drive is presented. Such a structure is especially recommended for speed in the range of single revolutions per second (excluding standstill). The method uses a back EMF observer for position estimation. However, there is no need to estimate the speed. This is a big advantage because of possible irregularity of estimated back EMF in this speed range, which makes the calculation of speed difficult or impossible. The proposed structure is similar to the model following control, but the reference model attempts to track the motor operating point. The main idea is to utilize as a reference a model of the whole drive, including speed and current controllers and motor model. Such a model produces reference voltage for the real inverter. However, an extra unit -called rotator -is needed to provide precise control of direct axis current, which is sensitive to the improper position of the voltage vector. The rotator acts as a kind of compensator for error of position estimation. range. This is confirmed by experimentally obtained waveforms shown in Fig. 1 and Fig. 2. This is the idle speed, using a constant value of reference current on q axis. These waveforms were obtained for a traditional field oriented control (FOC) method of the PMSM (using a similar structure as is shown in Fig. 4), with a cascade control structure using a closed speed control loop (which was disconnected for the test) with inner current control loops containing separate controllers on d and q axes, rotating synchronously with the rotor. The overall structure of control utilizes the sine and cosine of the estimated position and calculated speed value instead of measured values.To obtain smooth output values from the observer, the reference voltage is used instead of measured ones. This simplification gives good results

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“…Naturally, this also involves an extensive volume of literature on filtration [23,24,[28][29][30][31][32][33][34]. The most common types of filters used in this task are: Kalman filter [29,35,36], α-β filter and its extensions [32], and complementary filter [31,35]. The popularity of complementary and α-β filters is due to their simplicity and computational efficiency, which translates into their performance and reduced need for microprocessor power.…”

Section: Introductionmentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Laddach

Łangowski

Zubowicz

2022

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A low-cost measurement system using filtering of measurements for two-wheeled balancing robot stabilisation purposes has been addressed in this paper. In particular, a measurement system based on gyroscope, accelerometer, and encoder has been considered. The measurements have been corrected for deterministic disturbances and then filtered with Kalman, α-β type, and complementary filters. A quantitative assessment of selected filters has been given. As a result, the complete structure of a measurement system has been obtained. The performance of the proposed measurement system has been validated experimentally by using a dedicated research rig.

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A correction in feedback loop applied to two-axis gimbal stabilization

Cited by 6 publications

References 7 publications

Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection

Multi-Resolution STAP for Enhanced Ultra-Low-Altitude Target Detection

A new sensorless speed control structure for PMSM using reference model

Bulletin of the Polish Academy of Sciences: Technical Sciences

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