• Journal of the Korea Institute of Military Science and Technology
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• v.21 no.3
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• pp.323-330
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• 2018

In this paper, design and fabrication of a MSP(Multiple Scattering Points) discriminator for a simulated target measurement using a HRR(High Range Resolution) RADAR are described. The MSP discriminator is designed to provide a reference signal at the installed point on the simulated target in an outdoor test. The MSP discriminator is designed to have a remote control function that can turn the MSP discriminator on and off when the target moves to a remote location. While the MSP discriminator is off, the MSP discriminator is designed to be small enough not to spoil the target's unique RCS. The MSP discriminator consists of RF components in the Ku-band. In order to prevent spreading of the signal, a cable were added to the MSP discriminator to have an appropriate feedback loop delay considering the resolution of the RADAR. The fabricated MSP discriminator provided a reference scattering point as an RCS of approximately 1 dBsm. As a result, by using the MSP discriminator, the physical scattering points of the target were clearly identified in the measured signals with the RADAR.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.431-434
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• 2006

현재 사용되는 디지털 신호처리 방식의 GPS(Global Positioning System) 수신기는 최소의 RF 블록만을 이용하여 모든 디지털 신호 처리를 소프트웨어로 수행하고 있다. 소프트웨어 GPS수신기의 장점으로는 디지털 신호처리 과정이 모두 소프트웨어로 구현되어 있기 때문에 새로운 구현 방식이나 알고리즘을 적용할 시, 하드웨어 변경은 필요가 없게 되고, 소프트웨어 재설계만으로 가능하다. GPS 수신기의 Tracking module 성능은 DLL discriminator function과 FLL discriminator function의 Algorithm에 의해서 영향을 받게 된다. DLL discriminator function algorithm에는 dot-product 와 normalized dot-product 방법 등이 있으며, FLL discriminator function algorithm에는 sign(dot)(cross)-product 와 cross-product 그리고 ATAN 방법이 있다. 이러한 discriminator function들은 algorithm에 따라 input error에 대한 discriminator의 출력 값을 일정한 범위에서의 차이를 나타내게 되면서 ranging accuracy에서 차이가 나타나게 된다. 본 논문에서는 Nordnav 소프트웨어 GPS 수신기를 이용하여 DLL discriminator algorithm과 FLL discriminator algorithm의 성능을 비교, 분석을 하고 Tracking accuracy, sensibility, 그리고 multipath rejection에 대해서 알아보고자 한다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.11 no.4
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• pp.25-29
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• 1974

In this paper, a surfer wide-band FM lossy-line discriminator is investigated, as it has the merit of rediucing the dimensions of the discriminator by using proper dielectric material in the transmission tine. It is shown that the lossy-line discriminator that is made of a pair of the transmission lines satisfying the distortionless condition approximately gives almost no more deterioration in its characteristics than the ideal-line FM discriminator, while the dimensions of the transmission lines of the discriminator can be reduced greatly.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.841-844
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• 1987

In this paper we describe a planar type SAW(surface acoustic wave) FM discriminator, in which a 3 dB multistrip coupler is used to keep the linearity of wideband FM discrimination. This discriminator without 3 dB multistrip coupler is also applicable to DPSK demodulation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.9
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• pp.912-918
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• 2014

In this paper, a VHF band multi channel phase discriminator for direction finding equipment using tripple baseline interferometer technique is proposed. In order to measure simultaneously phase difference between IF(Intermediate Frequency) signals of the direction finding equipment, phase discriminator was designed to have parallel structure with multi channel, the phase correlator of phase discriminator was designed with I, Q mixer for reducing number of components. And digital LUT(Look Up Table) was applied for compensating error of phase discriminator due to phase unbalance of RF components. The measured phase accuracy of fabricated phase discriminator was 2 degree RMS(Root Mean Square) at 30 dB SNR condition, which is superior to the phase accuracy of conventional product.

• Journal of the Korean Institute of Telematics and Electronics
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• v.16 no.3
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• pp.49-56
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• 1979

A new microwave frequency disriminator in MIC is described which was developed using realization theory appropriate to a transmission line frequency discriminator designed to be used in the VHF range. It is experimentally verified that the discriminator is linear in a 600 MHz bandwith and has VSWR less than 1.2 in that range in agreement with the theoretical model.

• Journal of the Korean Institute of Telematics and Electronics
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• v.7 no.4
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• pp.1-5
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• 1970

This presents the way in shich the input impedance, and the output waveform of the line discriminator are influenced by a discrepancy of less than $\pm$10% in the coupling resistor resistance from the optium value(Characteristic impedance of the transmission line used in the line discriminator)

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.1
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• pp.36-41
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• 1986

A new microwave wideband frequency discdriminator is described, which is based on the theory of transmission line frequency discriminator known as having the widest bandwidth. It has been realized with microstrip lines and slot lines. It is experimentally verified that the discriminator is linear in a 1.6 GHz bandwidth centered at frequency of 3.2 GHz and has return loss of 20dB or more in that bandwidth.

• Journal of the Korean Institute of Telematics and Electronics
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• v.3 no.2
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• pp.18-23
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• 1966

The dynamic analyses of FM discriminators-Slope, Travis, Foster-Seely, and Ratio types-are presented by the method of Fourier Transform. The relationships between the distortion of the output waveform from the discriminator and its input FM wave and circuit constants are clearly shown in this study. According to the results, the Travis, Foster-Seely, and the ratio discriminators contain only odd harmonics, but the slope discriminator contains both even and odd harmonics. The permissible handwidth of travis discriminator for the 2% distortion is about twice those of Foster-Seely and ratio discriminatosr and sixteen times that of slope discriminator.

• 전자공학회논문지 IE
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• v.43 no.1
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• pp.16-24
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• 2006

This paper is aimed to develope of an integrated BCI(Brain Computer Interface System) that make possible for simultaneous multichannel data process and used extra cellular neural activity from the vestibular system instead of electroencephalogram signals for more precision control. The electrical properties pre-amplifier are 47.6 dB of gain, 0.005 % of distortion at 100 Hz, 12M$\Omega$ of input impedance. Window discriminator used two CPU with difference role to increase processing speed so that sampling frequency was 87 kHz. The designed window discriminator has more not only two times in signal resolution power but also ten times in error discrimination power than commericially available discriminator. The proposed method decreases 100 times in amount of integrated data then BCI system during 100 ms.