FPGA-Based 1.2 GHz Bandwidth Digital Instantaneous Frequency Measurement Receiver

Helton, J.; Chen, C.-I.H.; Lin, David M.; Tsui, J.B.Y.

doi:10.1109/isqed.2008.4479798

Cited by 35 publications

(20 citation statements)

References 1 publication

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“…A simple DIFM processor does phase-to-frequency operation to measure frequency using two parameters: cos βL and sin βL coming from phase-correlator [4,7,11]. i.e.…”

Section: Concept Of /Conventional Digital Ifm (Difm) Techniquementioning

confidence: 99%

Sensitivity Enhancement in Digital Instantaneous Frequency Measurement

Sree¹,

Rao²

2014

IJIRSET

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ABSTRACT:Frequency is one of the important parameters to be intercepted for the hostile radars. Digital instantaneous frequency measurement (DIFM) receiver is the mostly used frequency receiver in EW system. The main concern of the DIFM Rx is: Low sensitivity, Low frequency accuracy and fails to handle simultaneous (time overlapped) signals.Sensitivity refers to the minimum RF level at the input of the receiver channel. To do this, a decision making process must take place. The decision is the crossing of a voltage threshold set at a level above the noise floor, representing the number of decibels above random noise that a voltage, signal or noise must attain to assure a certain false alarm rate.The setting of threshold is an important factor in establishing the receiver operating sensitivity, since the higher it is set to reduce false alarms, the greater the signal amplitude necessary to be recognized as a signal to be processed. The proposed design aims to find out the method to improve the Constant False Alarm Rate detector performance by increasing the threshold value and simultaneously enhancing the sensitivity of the system. This technique will be analyzed in MATLAB and implemented on FPGA based digital board through VHDL.

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“…A simple DIFM processor does phase-to-frequency operation to measure frequency using two parameters: cos βL and sin βL coming from phase-correlator [4,7,11]. i.e.…”

Section: Concept Of /Conventional Digital Ifm (Difm) Techniquementioning

confidence: 99%

Sensitivity Enhancement in Digital Instantaneous Frequency Measurement

Sree¹,

Rao²

2014

IJIRSET

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“…Then, the autocorrelation between delayed and non-delayed signals are calculated. Phase of autocorrelation result will be a linear function of input frequency [5,7].…”

Section: Basic Principle Of Operationmentioning

confidence: 99%

“…As the signal will include noise, this will only provide a very rough estimation of the frequency measurement. The sensitivity requirement for an IFM receiver cannot be met with only one correlator [5]. Four autocorrelation variables with four delays (m=1, 2, 8, 16) are used in the digital IFM receiver algorithm.…”

Section: Frequency Measurement Algorithmmentioning

confidence: 99%

“…The next stage involves two differential amplifiers that perform a subtraction. Lastly, the phase difference between two signals, 2 f is determined by taking 1 1 2 tan ( ) E E , which is used to determine the input frequency of the received signal [4,5,6]. In this article, frequency estimation is performed based on analog method without using any analog devices.…”

Section: Introductionmentioning

confidence: 99%

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Very High Resolution Digital Instantaneous Frequency Measurement Receiver

Mahlooji

Mohammadi

2009

2009 International Conference on Signal Processing Systems

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The fine frequency estimation of received signal is very important in Electronic Warfare and communication systems. The performance of radar classification depends on the accuracy of frequency measurements. Since frequency measurement accuracy in Digital Instantaneous Frequency Measurement receiver is highly dependent on corresponding pulse detection technique, here we propose an improved approach which is able to detect pulses as narrow as 50 nsec. Simulation results confirm that this receiver is capable of detecting pulses with 50 nsec width over 1.2 GHz bandwidth with a major error within 43 KHz.

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“…The analog delay line is indicated with a known constant time, which cannot be changed flexibly and hard to do maintenance. In recent years, with ADC technique and FPGA highly developed, there are various Digital Instantaneous Frequency Measurements (DIFMs) presented in [4,5]. However most of them are limited in bandwidth and conversion time of ADC due to the disadvantage of high output data pipeline delay and bandwidth.…”

Section: Introductionmentioning

confidence: 99%

FPGA-based ultra-fast and wideband instantaneous frequency measurement receiver

Xie

Zhang

Yang

et al. 2014

IEICE Electron. Express

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In this paper, an ultra-wideband, ultra-fast, fine resolution and compact digital instantaneous frequency measurement (DIFM) is proposed. The algorithm is implemented on the platform of Virtex-5 Field Programmable Grid Array (FPGA) from Xilinx. Due to only one high speed comparator with some relative circuits are needed, this DIFM can be blended in other digital system with compact size. The RocetIO GTP has been successfully introduced in this system for the interface with comparator. Thanks to the advantage of 1.46 GHz wideband, the large numbers of RF channels required in traditional solutions can be decreased. Comparing to traditional analog and digital method, this design is more flexible to reconfigure, easy to adjust, and with smaller size. The measurement results show that our invention is capable of detecting short wave pulse and continuous wave (CW) signal from DC to 1.46 GHz with a major error within 1.25 MHz in less than 200 ns throughput time. This digital instantaneous frequency measurement (DIFM) system has been successfully used in radar systems.

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FPGA-Based 1.2 GHz Bandwidth Digital Instantaneous Frequency Measurement Receiver

Cited by 35 publications

References 1 publication

Sensitivity Enhancement in Digital Instantaneous Frequency Measurement

Sensitivity Enhancement in Digital Instantaneous Frequency Measurement

Very High Resolution Digital Instantaneous Frequency Measurement Receiver

FPGA-based ultra-fast and wideband instantaneous frequency measurement receiver

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