A $Ka$-Band FMCW Radar Front-End With Adaptive Leakage Cancellation

Lin, Kui; Wang, Yuanxun Ethan; Pao, Cheng-Keng; Shih, Yi-Chi

doi:10.1109/tmtt.2006.885882

Cited by 143 publications

(35 citation statements)

References 5 publications

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“…FMCW 방식 설계에서 중요한 특성은 주파수 변조 선 형성(linearity)과 송신기의 위상 잡음(phase noise)이다. 비 선형성은 특히 고고도 측정 오차를 크게 하고 [5] , 송신기 위상 잡음은 수신기의 수신 감도를 저하시킨다 [10], [11] . …”

Section: ⅰ 서 론unclassified

Design of the Transceiver for a Wide-Range FMCW Radar Altimeter Based on an Optical Delay Line

Choi¹,

Jang²,

Roh³

2014

The Journal of Korean Institute of Electromagnetic Engineering

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This paper presents the design of a Frequency Modulated Continuous Wave(FMCW) radar altimeter with wide altitude range and low measurement errors. Wide altitude range is achieved by employing the optic delay in the transmitting path to reduce the dynamic range of measuring altitude. Transmitting power and receiver gain are also controlled to have the dynamic range of the received power be reduced. In addition, low measurement errors are obtained by improving the sweep linearity using the Direct Digital Synthesizer(DDS) and minimizing the phase noise employing the reference clock(Ref_CLK) as the offset frequency of the Phase Locked Loop(PLL).

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Section: ⅰ 서 론unclassified

Design of the Transceiver for a Wide-Range FMCW Radar Altimeter Based on an Optical Delay Line

Choi¹,

Jang²,

Roh³

2014

The Journal of Korean Institute of Electromagnetic Engineering

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“…Trying to solve above issues, multiple measures have been taken, such as using step-scanning antenna [2], employing DC-block filter to eliminate noise around zero frequency [3], applying high dynamic analog-to-digit convertor (ADC) [4], measuring the range of DC offset so as to extract noise from the total DC output in a quadrature Doppler radar system [5], canceling intruding clutter by combining equal amplitude and opposite phase signals with received ones [6], and so forth. While these measures decrease the influence of the low frequency noise in different ways and improve the DCR radar performance in different scenarios, they are not generally applicable for pulse compression radar (PCR) systems or very complicated in hardware implementation.…”

Section: Radar Systems Have Been Absorbing New Technologies To Increamentioning

confidence: 99%

DC offset and low frequency noise compensation for direct-conversion receiver in pulse compression radar

Pan

Wang

Shuang-tian

et al. 2011

2011 International Workshop on Antenna Technology (iWAT)

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In this paper, we replace low-pass filter (LPF) in traditional direct-conversion receiver (DCR) in pulse compression radar (PCR) by pre-defined filter (PDF) to directly filter direct-current offset and low frequency noise. We also accordingly propose an algorithm for compensating the distance range resolution degradation caused by PDF's effect on low frequency components of received linear frequency modulation (LFM) signals. Based on the theoretical understanding on how the low frequency band influences the pulse compression, a set of newly deduced equations are used to calculate the compression, and the range resolution degradation can be recovered based on the priori knowledge of the employed LFM signal and filters. This method can be used in all pulse compression radars where pre-defined continuous radar signals are employed.

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“…In an amplifier linearization system [5], vector modulator is used to generate signals out of phase to cancel harmonic signals generated by the amplifier. Similarly, in a continuous wave (CW) radar system [6], vector modulators are applied to improve isolation by cancelling the leakage signal from transmitter to receiver.…”

Section: Introductionmentioning

confidence: 99%

A balanced reflection type HMIC vector modulator over 34–36GHz based on cold state pHEMTs

Sun

Shu

2015

2015 IEEE International Wireless Symposium (IWS 2015)

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A vector modulatorat Ka band consisting of two balanced I/Q bi-phase attenuatorsis presented in this paper. The bi-phase attenuators are of reflection type, in which cold state pHEMTs are employed as tunable impedance loads. Due to the balanced structure, parasitic effects of the pHEMTs are effectively cancelled. A prototype of the vector modulator is fabricated by HMIC technique.The measured dynamic range of amplitude is about 28dB with 360 degree tunable phase. The maximum transmission coefficient is about -8dB while the return loss is better than 15dB at the whole operation band of 34-36GHz.

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A $Ka$-Band FMCW Radar Front-End With Adaptive Leakage Cancellation

Cited by 143 publications

References 5 publications

Design of the Transceiver for a Wide-Range FMCW Radar Altimeter Based on an Optical Delay Line

Design of the Transceiver for a Wide-Range FMCW Radar Altimeter Based on an Optical Delay Line

DC offset and low frequency noise compensation for direct-conversion receiver in pulse compression radar

A balanced reflection type HMIC vector modulator over 34–36GHz based on cold state pHEMTs

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A $Ka$-Band FMCW Radar Front-End With Adaptive Leakage Cancellation

Cited by 143 publications

References 5 publications

Design of the Transceiver for a Wide-Range FMCW Radar Altimeter Based on an Optical Delay Line

Design of the Transceiver for a Wide-Range FMCW Radar Altimeter Based on an Optical Delay Line

DC offset and low frequency noise compensation for direct-conversion receiver in pulse compression radar

A balanced reflection type HMIC vector modulator over 34&#x2013;36GHz based on cold state pHEMTs

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About

A balanced reflection type HMIC vector modulator over 34–36GHz based on cold state pHEMTs