Design of a high-speed intermediate frequency radar signal generator

2009 ◽  
Author(s):  
Z.J. Li ◽  
L.N. Gao ◽  
L. Teng
Keyword(s):  
High Speed ◽  
Intermediate Frequency ◽  
Signal Generator ◽  
Radar Signal

scholarly journals Reference frequencies comb generation for microwave photonics ADC with signal spectral-interval estimation

2019 ◽  
Vol 30 ◽  
pp. 14005
Author(s):  
Victor Kulagin ◽  
Vladimir Cherepenin ◽  
Sergey Kontorov ◽  
Denis Prokhorov ◽  
Victor Valuev
Keyword(s):  
Numerical Simulation ◽  
Input Signal ◽  
High Speed ◽  
Frequency Comb ◽  
Interval Estimation ◽  
Microwave Photonics ◽  
Intermediate Frequency ◽  
Spectral Interval ◽  
Frequency Noise ◽  
Reference Frequency

Formation of a reference frequency comb in a circuit comprising a highly stable continuous laser and an amplitude Mach- Zehnder modulator with two independent RF inputs working with large modulation index for use in a high-speed microwave photonics ADC with spectral-interval estimation is investigated by numerical simulation. In such ADCs, the entire spectrum of the input signal is divided by microwave photonics elements into spectral intervals, each of which uses a microwave photonics converter to transform the signal to an intermediate frequency (for each part of the spectrum of the microwave input signal, its own reference frequency is used for heterodyning). The requirements for a multimode source of optical reference frequencies for high-speed microwave photonics ADC are formulated. To study the characteristics of such a source, numerical modeling is carried out. It is shown that the frequency noise of the laser can be partially suppressed due to their compensation when converted to an intermediate frequency. Experimental study of the reference frequency comb generator layout showed a good agreement of the obtained characteristics with the results of numerical simulation.

High Speed Pseudo-Random Signal Generator Based On FPGA

2019 ◽  
Author(s):  
Zhang Yuan ◽  
Xu Xiao-Dong ◽  
Shi Xiao-Feng ◽  
Zhao Zheng-Ping ◽  
Li Heng
Keyword(s):  
High Speed ◽  
Signal Generator ◽  
Random Signal

Discrete Electronic Warfare Signal Processing using Compressed Sensing Based on Random Modulator Pre-Integrator

2015 ◽  
Vol 65 (6) ◽  
pp. 472 ◽  
Author(s):  
M. Sreenivasa Rao ◽  
Chandan C. Mishra ◽  
K. Krishna Naik ◽  
K. Maheshwara Reddy
Keyword(s):  
Signal Processing ◽  
Input Signal ◽  
High Speed ◽  
Traditional Approach ◽  
Ultra Wideband ◽  
Radar Signal ◽  
Electromagnetic Spectrum ◽  
Electronic Warfare ◽  
High Speed Adc ◽  
Detection Of Signals

Electronic warfare receiver works in the wide electromagnetic spectrum in dense radar signal environment. Current trends in radar systems are ultra wideband and low probability of intercept radar technology. Detection of signals from various radar stations is a concern. Performance and probability of intercept are mainly dependent on high speed ADC technology. The sampling and reconstruction functions have to be optimized to capture incoming signals at the receiver to extract characteristics of the radar signal. The compressive sampling of the input signal with orthonormal base vectors, projecting the basis in the union of subspaces and recovery through convex optimisation techniques is the current traditional approach. Modern trends in signal processing suggest the random modulator pre-integrator (RMPI), which sample the input signal at information rate non-adaptively and recovery by the processing of discrete and finite vectors. Analysis of RMPI theory, application to EW receiver, simulation and recovery of EW receiver signals are discussed.

scholarly journals A Subsystem Test Bed for Chinese Spectral Radioheliograph

2014 ◽  
Vol 31 ◽  
Author(s):  
An Zhao ◽  
Yihua Yan ◽  
Wei Wang
Keyword(s):  
Spectral Resolution ◽  
High Speed ◽  
Digital Signal ◽  
Digital Processing ◽  
Intermediate Frequency ◽  
High Spectral Resolution ◽  
High Temporal Resolution ◽  
Test Bed ◽  
Software Algorithms ◽  
High Speed Data

AbstractThe Chinese Spectral Radioheliograph is a solar dedicated radio interferometric array that will produce high spatial resolution, high temporal resolution, and high spectral resolution images of the Sun simultaneously in decimetre and centimetre wave range. Digital processing of intermediate frequency signal is an important part in a radio telescope. This paper describes a flexible and high-speed digital down conversion system for the CSRH by applying complex mixing, parallel filtering, and extracting algorithms to process IF signal at the time of being designed and incorporates canonic-signed digit coding and bit-plane method to improve program efficiency. The DDC system is intended to be a subsystem test bed for simulation and testing for CSRH. Software algorithms for simulation and hardware language algorithms based on FPGA are written which use less hardware resources and at the same time achieve high performances such as processing high-speed data flow (1 GHz) with 10 MHz spectral resolution. An experiment with the test bed is illustrated by using geostationary satellite data observed on March 20, 2014. Due to the easy alterability of the algorithms on FPGA, the data can be recomputed with different digital signal processing algorithms for selecting optimum algorithm.

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