Design of Marine Radar Signal Generator

2013 ◽  
Vol 756-759 ◽  
pp. 1446-1449
Author(s):  
Xue Juan Tong ◽  
Jin Lei Pang ◽  
Feng Qi Fu ◽  
Yi Lin Yuan
Keyword(s):  
Radar System ◽  
Signal Generator ◽  
Radar Signal ◽  
Working Principle ◽  
Marine Radar ◽  
Radar Simulator ◽  
High Level

Radar signal generator in the high-level radar simulator equipped with true radar dsiplay can serve training and eduaction better. For this purpose, this paper analyzes real radar system, summarizes the working principle of radar signal generator, and brings forward a realization project which based on MCU.In conclusion, all signals generated by the radar signal generator meet the required by the preliminary debugging.

Research on Radar Target Simulator

2014 ◽  
Vol 971-973 ◽  
pp. 1726-1729
Author(s):  
Ying Liu ◽  
Dian Ren Chen ◽  
Lei Chen
Keyword(s):  
Analog Circuits ◽  
Simulation System ◽  
Host Computer ◽  
Radar Signal ◽  
Radar Target ◽  
Sampled Data ◽  
Characteristic Parameters ◽  
Target Characteristic ◽  
Radar Simulator ◽  
Simulation Signal

A radar target simulation system based on DRFM is designed in this paper ,in this system, the radar signal that is amplified and conversioned by the receive analog circuits is directly sampled by the ADC of DRFM, then the sampled data is stored in QDR2 SRAM array. When need to generate radar target simulation signal, the radar signal data is read from the QDR2 SRAM array and synthesis radar target simulation signal with the target characteristic parameters provided by the host computer. It can be widely used in various radar simulator occasions.

scholarly journals A Multiple Target Positioning and Tracking System Behind Brick-Concrete Walls Using Multiple Monostatic IR-UWB Radars

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4033 ◽  
Author(s):  
Yoo ◽  
Wang ◽  
Seol ◽  
Lee ◽  
Chung ◽  
...  
Keyword(s):  
False Alarm ◽  
False Alarm Rate ◽  
Detection Rate ◽  
Tracking System ◽  
Radar System ◽  
Ultra Wideband ◽  
Radar Signal ◽  
High Detection Rate ◽  
Concrete Walls ◽  
Uwb Radar

Recognizing and tracking the targets located behind walls through impulse radio ultra-wideband (IR-UWB) radar provides a significant advantage, as the characteristics of the IR-UWB radar signal enable it to penetrate obstacles. In this study, we design a through-wall radar system to estimate and track multiple targets behind a wall. The radar signal received through the wall experiences distortion, such as attenuation and delay, and the characteristics of the wall are estimated to compensate the distance error. In addition, unlike general cases, it is difficult to maintain a high detection rate and low false alarm rate in this through-wall radar application due to the attenuation and distortion caused by the wall. In particular, the generally used delay-and-sum algorithm is significantly affected by the motion of targets and distortion caused by the wall, rendering it difficult to obtain a good performance. Thus, we propose a novel method, which calculates the likelihood that a target exists in a certain location through a detection process. Unlike the delay-and-sum algorithm, this method does not use the radar signal directly. Simulations and experiments are conducted in different cases to show the validity of our through-wall radar system. The results obtained by using the proposed algorithm as well as delay-and-sum and trilateration are compared in terms of the detection rate, false alarm rate, and positioning error.

scholarly journals Probabilistic analysis of ambiguities in radar echo direction of arrival from meteors

2020 ◽  
Author(s):  
Daniel Kastinen ◽  
Johan Kero
Keyword(s):  
Bayesian Method ◽  
Direction Of Arrival ◽  
Radar System ◽  
Stable Region ◽  
Radar Signal ◽  
Ambient Atmosphere ◽  
Radar Systems ◽  
Mu Radar ◽  
Meteor Trail ◽  
The Antarctic

Abstract. Meteors and hard targets produce coherent radar echoes. If measured with an interferometric radar system, these echoes can be used to determine the position of the target through finding the Direction Of Arrival (DOA) of the incoming echo onto the radar. If the DOA of meteor trail plasma drifting with the ambient atmosphere is determined, the neutral wind at the observation altitude can be calculated. Specular meteor trail radars have become widespread scientific instruments to study atmospheric dynamics. Meteor head echo measurements also contribute to studies of the atmosphere as the meteoroid input of extraterrestrial material is relevant for a plethora of atmospheric phenomena. Depending on the spatial configuration of radar receiving antennas and their individual gain patterns, there may be an ambiguity problem when determining the DOA of an echo. Radars that are theoretically ambiguity free are known to still have ambiguities that depend on the total radar Signal to Noise Ratio (SNR). In this study we investigate robust methods which are easy to implement to determine the effect of ambiguities on any hard target DOA determination by interferometric radar systems. We apply these methods specifically to simulate four different radar systems measuring meteor head and trail echoes using the multiple signal classification (MUSIC) DOA determination algorithm. The four radar systems are the middle and upper atmosphere (MU) radar in Japan, a generic Jones 2.5λ specular meteor trail radar configuration, the Middle Atmosphere Alomar Radar System (MAARSY) radar in Norway and the The Program of the Antarctic Syowa Mesosphere Stratosphere Troposphere Incoherent Scatter (PANSY) radar in the Antarctic. We also examined a slightly perturbed Jones 2.5λ configuration used as a meteor trail echo receiver for the PANSY radar. All the results are derived from simulations and their purpose is to grant understanding of the behaviour of DOA determination. General results are: there may be a region of SNRs where ambiguities are relevant; Monte Carlo simulation determines this region and if it exists; the MUSIC function peak value is directly correlated with the ambiguous region; a Bayesian method is presented that may be able to analyse echoes from this region; the DOA of echoes with SNRs larger then this region are perfectly determined; the DOA of echoes with SNRs smaller then this region completely fail to be determined; the location of this region is shifted based on the total SNR versus the channel SNR in the direction of the target; asymmetric subgroups can cause ambiguities even for ambiguity free radars. For a DOA located at the zenith, the end of the ambiguous region is located at 17 dB SNR for the MU radar and 3 dB SNR for the PANSY radar. The Jones radars are usually used to measure specular trail echoes far from zenith. The ambiguous region for a DOA at 75.5° elevation and 0° azimuth ends at 12 dB SNR. Using the Bayesian method it may be possible to analyse echoes down to 4 dB SNR for the Jones configuration, given enough data points from the same target. The PANSY meteor trail echo receiver did not deviate significantly from the generic Jones configuration. The MAARSY radar could not resolve arbitrary DOAs sufficiently well to determine a stable region. However, if the DOA search is restricted to 70° elevation or above by assumption, stable DOA determination occurs above 15 dB SNR.

Situation Display

1973 ◽  
Vol 26 (3) ◽  
pp. 290-298
Author(s):  
P. O. Prior
Keyword(s):  
Time Lag ◽  
Radar System ◽  
Commercial Development ◽  
General Manager ◽  
Technical Description ◽  
Factors Influencing ◽  
Marine Radar

This paper was presented at a meeting of the Institute held in London on 12 January 1973 with the President, G. E. Beck, in the Chair. Mr. Prior, Director and General Manager of Kelvin Hughes, discusses factors influencing the commercial development of an innovation in navigational equipment and the inevitable time lag in production for the market. A technical description of Situation Display, the new marine radar system from Kelvin Hughes, was published in the April issue of this Journal. The discussion printed here relates both to Mr. Prior's paper and the technical description.

Research of FMCW for Perfect Binary Sequences Pairs

2013 ◽  
Vol 401-403 ◽  
pp. 1419-1423
Author(s):  
Hui Long Jin
Keyword(s):  
Key Words ◽  
Target Detection ◽  
Frequency Modulation ◽  
Correlation Functions ◽  
Radar System ◽  
Signal Generator ◽  
Binary Sequences ◽  
Auto Correlation ◽  
Stepped Frequency ◽  
New System

An improved FMCW auto-collision radar system is introduced. The system includes perfect binary sequences pairs theory, the method using auto-correlation functions to get target signal and measure distance, this enables itself to get constant development with theoretical progress. The new system only changes the program of signal generator a little, moreover it can be realized by DSP, which can reduce the false alert notably so as to be applied increasingly widely. Key words: stepped-frequency modulation; multi-target detection; perfect binary sequences pairs

A Method to Improve the Accuracy of Adjustable Phase Difference of Signal Generator

2011 ◽  
Vol 301-303 ◽  
pp. 823-827
Author(s):  
Jian Guo ◽  
Bing Wu Liu ◽  
Ping Ping Dong
Keyword(s):  
Phase Difference ◽  
Phase Control ◽  
Control Word ◽  
Signal Generator ◽  
Frequency Resolution ◽  
Frequency Synthesis ◽  
Direct Digital Frequency Synthesis ◽  
Working Principle ◽  
Phase Setting ◽  
Low Efficiency

Direct digital frequency synthesis (DDFS) technology is applied widely in traditional fields which need signal source since it has a lot of advantages such as high frequency resolution, fast frequency setting and conversion speed and so on. Based on the working principle of DDFS, it is very important to calculate the phase control word when synthesizing the continuous adjustable phase difference signals. To address the shortcoming of large computation, low efficiency of phase difference setting, more storage space occupied or significant cumulative errors of phase setting when calculating phase control word with traditional methods, a novel algorithm for computing phase control word is studied in this paper. This new method does not need large computation and more space and simultaneously it can decrease the error greatly, which plays an important role in improving the phase setting speed and precision in signal generator.

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