Research on phase shift in mono-pulse angle tracking system

2009 ◽  
Author(s):  
Zhang Xiaojing ◽  
Su Hongyan ◽  
Zhu Huaicheng
Keyword(s):  
Phase Shift ◽  
Tracking System ◽  
Angle Tracking ◽  
Pulse Angle

Studying noise immunity of radio information transmission systems with noise-like phase-shift keyed signals and synchronization delay errors

2019 ◽  
pp. 105-113
Author(s):  
G. N. Maltsev ◽  
A. V. Evteev
Keyword(s):  
Phase Shift ◽  
Information Transmission ◽  
Noise Immunity ◽  
Tracking System ◽  
Tracking Error ◽  
Information Symbol ◽  
Transmission Systems ◽  
Synchronization System ◽  
Correlation Receiver ◽  
Selection Of

Introduction: Radio information transmission systems with noise-like phase-shift keyed signals based on pseudo-random sequences have potential noise immunity provided by accurately tracking the delay of the received signal in the correlation receiver. When working with moving objects, the delay of the received signal varies continuously, and the reception quality for noise-like phase-shifted signals highly depends on the synchronization system operation and on the accuracy of estimating the received signal delay by the tracking system. To ensure the required signal reception quality, it is necessary to provide an informed choice of tracking system parameters, taking into account their effects, which are the random and systematic components of the delay tracking error, on the selected noise immunity indicator.Purpose: Analyzing how the errors in tracking the delay of a received phase-shift keyed signal based on a pseudorandom sequence by the synchronization system of a radio information transmission system can affect the probability of erroneous reception of an information symbol.Results: The calculation method was used to obtain families of dependencies of the probability of erroneous reception of an information symbol on the signal-noise ratio (SNR), and the values of the random and systematic components of the delay tracking error which are normalized to the capture band of the correlation receiver. It has been shown that at a fixed SNR, the values of the random and systematic components of the delay tracking error are critical for the erroneous reception probability. In all the cases discussed, all the dependencies are characterized by a slow change of the erroneous reception probability while the synchronization errors within the area of small SNR have fixed values. As the SNR value grows, the erroneous reception probability rapidly drops. To ensure the specified signal reception quality and the reliability of the selection of information symbols and messages in a radio information transmission system with noise-like phase-manipulated signals, its synchronization system requires a joint selection of the tracking system parameters, taking into account the limitations imposed by the operating conditions and technical implementation features.Practical relevance: The obtained results can be used in noise immunity analysis of radio information transmission systems with noise-like phase-shift keyed signals in a wide range of communication conditions, and in providing technical solutions for synchronization systems ensuring the required quality of signal reception.

scholarly journals Dual axis solar angle tracking system without any sensor

2018 ◽  
Vol 2 (3) ◽  
pp. 127-136 ◽  
Author(s):  
Zuhal Er ◽  
Elif Balcı
Keyword(s):  
Tracking System ◽  
Angle Tracking ◽  
Solar Angle

scholarly journals Optimum range of angle tracking radars: a theoretical computing

2019 ◽  
Vol 9 (3) ◽  
pp. 1765 ◽  
Author(s):  
Sadegh Samadi ◽  
Mohammad Reza Khosravi ◽  
Jafar A. Alzubi ◽  
Omar A. Alzubi ◽  
Varun G. Menon
Keyword(s):  
Closed Form ◽  
Optimization Problem ◽  
Tracking System ◽  
Total Error ◽  
Optimal Range ◽  
The Past ◽  
Simple Simulation ◽  
Simulation Based ◽  
Angle Tracking ◽  
Theoretical Computing

In this paper, we determine an optimal range for angle tracking radars (ATRs) based on evaluating the standard deviation of all kinds of errors in a tracking system. In the past, this optimal range has often been computed by the simulation of the total error components; however, we are going to introduce a closed form for this computation which allows us to obtain the optimal range directly. Thus, for this purpose, we firstly solve an optimization problem to achieve the closed form of the optimal range (Ropt.) and then, we compute it by doing a simple simulation. The results show that both theoretical and simulation-based computations are similar to each other.

HIGH RESOLUTION MONOPULSE RADAR TRACKING SYSTEM

1992 ◽  
Vol 02 (04) ◽  
pp. 305-321
Author(s):  
Y.A. ALSAKA ◽  
L.A. YOUNG ◽  
M. HAMID
Keyword(s):  
High Resolution ◽  
Cross Sections ◽  
Tracking System ◽  
Error Function ◽  
Geometric Center ◽  
Radar Cross Sections ◽  
High Resolution Radar ◽  
Angle Tracking ◽  
Crosscorrelation Function ◽  
Frequency Pulse

High resolution radar techniques are applied to the problem of resolving a multiple target array and locating its geometric center without the usual biasing toward the brightest scatterer. This result is accomplished using monopulse radar techniques combined with high resolution stepped frequency pulse train signal processing in an angle tracking noncoherent high resolution radar. The center of each uniquely separated pair of point targets is calculated by examining the crosscorrelation function of the sum and difference channels. The autocorrelation of the sum channel is used to normalize the crosscorrelation data thereby eliminating the effects of the different targets’ radar cross sections (RCS). The zero separation term of the error function (dc term) remains biased toward the bigger scatterer, even after normalization. The nonzero terms (ac terms) are the cross range distances from the antenna’s boresight to each scatterer and are independent of their RCS. By simply dropping the zero separation term and averaging the remaining terms together, the aimpoint becomes the unbiased geometric center of the array.

scholarly journals Modeling and Simulation for the Investigation of Radar Responses to Electronic Attacks in Electronic Warfare Environments

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
So Ryoung Park ◽  
Ilku Nam ◽  
Sanguk Noh
Keyword(s):  
Electromagnetic Wave Propagation ◽  
Tracking System ◽  
Characteristic Parameters ◽  
Tracking Errors ◽  
Electronic Warfare ◽  
Input Section ◽  
Simulation Scenario ◽  
Deceptive Jamming ◽  
Set Up ◽  
Angle Tracking

An electronic warfare (EW) simulator is presented to investigate and evaluate the tracking performance of radar system under the electronic attack situations. The EW simulator has the input section in which the characteristic parameters of radar threat, radar warning receiver, jammer, electromagnetic wave propagation, and simulation scenario can be set up. During the process of simulation, the simulator displays the situations of simulation such as the received signal and its spectrum, radar scope, and angle tracking scope and also calculates the transient and root-mean-squared tracking errors of the range and angle tracking system of radar. Using the proposed EW simulator, we analyze the effect of concealment according to the noise and signal powers under the noise jamming and also analyze the effect of deception by calculating errors between the desired value and the estimated one under the deceptive jamming. Furthermore, the proposed EW simulator can be used to figure out the feature of radar threats based on the information collected from the EW receiver and also used to carry out the electronic attacks efficiently in electronic warfare.

Robust command filtered control for course tracking of ships under actuator dynamics with input magnitude and rate saturation

2021 ◽  
pp. 147509022110522
Author(s):  
Qijia Yao
Keyword(s):  
Control Strategy ◽  
Disturbance Observer ◽  
Closed Loop ◽  
Tracking System ◽  
Tracking Error ◽  
Small Region ◽  
Great Difficulty ◽  
Environmental Disturbances ◽  
Actuator Dynamics ◽  
Angle Tracking

This article investigates the course tracking of ships subject to parametric uncertainties and environmental disturbances. Particularly, the actuator dynamics with input magnitude and rate saturation is also considered. When including the actuator dynamics, the ship course tracking system becomes a mismatching system, which brings a great difficulty to the control design. A novel robust command filtered control strategy is presented by incorporating a disturbance observer and an auxiliary anti-saturation system into the command filtered backstepping control architecture. The disturbance observer is designed to compensate for the mismatched lumped disturbance. The auxiliary anti-saturation system is introduced to tackle the effects of input magnitude and rate saturation. It is strictly proved that all the closed-loop error signals under the proposed controller are uniformly ultimately bounded and the course angle tracking error can converge to the adjustable small region around the origin. Moreover, the proposed controller is computationally simple and has the strong robustness against uncertainties and disturbances. The effectiveness and advantages of the proposed control strategy are verified through simulations and comparisons.

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