Browsing by Author "Sharma, G.V.K."

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A high speed complementary pulse compressor and its implementation of FPGA
(Institute of Electrical and Electronics Engineers Inc., 2017) Kumar, K.N.L.; Srihari, P.; Satapathi, G.S.; Sharma, G.V.K.
This paper proposes a novel high speed radar pulse compressor implementation for complementary sequences. The high speed implementation is accomplished by incorporating the retiming technique to reduce the critical path of the circuit. In addition, unfolding the retimed pulse compressor further increases the speed by parallel operation. This concept is implemented on field programmable gate array (FPGA) and the experimental results demonstrate that, three-retimed-unfolded circuit (J = 3) is 2.78 times faster than the original circuit. Â© 2017 IEEE.
Analysis of 5G new radio waveform as an illuminator of opportunity for passive bistatic radar
(Institute of Electrical and Electronics Engineers Inc., 2021) Lingadevaru, P.; Pardhasaradhi, B.; Srihari, P.; Sharma, G.V.K.
Passive radar detects targets using the reflections of electromagnetic signals illuminated by unintended sources of opportunity in the given surveillance region. The illuminators of opportunity (IOO) like FM, DVB, DAB, LTE, WiMax, and radio frequency signals are used for the passive radar depending on the availability, frequency of operation and, type of application. This paper proposes the upcoming 5G New Radio waveform (5G NR) as an IOO for passive bistatic radar. The 5G NR waveform is used to perform parametric analysis of passive bistatic radar. The radar parameters like range resolution, velocity resolution, range product, maximum unambiguous PRF, and Cassini's ovals are investigated. Further, the 5G NR IOO is compared against existing LTE and other IOOs. Simulation results reveals that all the radar parameters are outperforming for the 5G NR waveform, claiming that 5G NR is a potential candidate for the future IOO. Â© 2021 IEEE.
A high speed complementary pulse compressor and its implementation of FPGA
(2017) Kumar, K.N.L.; Srihari, P.; Satapathi, G.S.; Sharma, G.V.K.
This paper proposes a novel high speed radar pulse compressor implementation for complementary sequences. The high speed implementation is accomplished by incorporating the retiming technique to reduce the critical path of the circuit. In addition, unfolding the retimed pulse compressor further increases the speed by parallel operation. This concept is implemented on field programmable gate array (FPGA) and the experimental results demonstrate that, three-retimed-unfolded circuit (J = 3) is 2.78 times faster than the original circuit. � 2017 IEEE.
High-Frequency and Low-Latency DSP Architecture for Information Matrix Fusion
(Institute of Electrical and Electronics Engineers Inc., 2021) Praharshita, D.S.L.; Pardhasaradhi, B.; Srihari, P.; Shripathi Acharya, U.S.; Sharma, G.V.K.
The centralized fusion architecture gives optimal global estimate by fusing all the measurements pertaining to a given target. The centralized architectures are computationally huge and requires full data rate requirements. Hence, in practice, decentralized architectures with Information matrix fusion (IMF) is popular to derive an estimate which is equal to optimal global estimate accomplished in centralized architecture. In this paper, a digital signal processing (DSP) architectural minimization technique of pipelining is applied to derive the highspeed IMF. We proposed two different DSP architectures, namely pipelined traditional IMF and pipelined adder-ladder IMF to reduce the critical path, which inturn, increases the architecture's operating frequency. Further, we derived an optimal number of pipeline stages and hardware resources that are required for a generalized N sensors case. The proposed pipelined adder-ladder IMF configuration requires a N + 1 pipeline stage and N + 2 pipeline stages for an even number of sensors and an odd number of sensors respectively. Besides that, The pipelined traditional IMF requires 2N + 1 stages to optimally pipeline and achieve the same operating frequency as that of pipelined adder-ladder IMF. Furthermore, the proposed pipelined adder-ladder IMF is superior in performance (less hardware and less latency) compared to pipelined traditional IMF. The theoretical analysis is performed with metrics (critical path, number of resources, and maximum achievable frequency) to compare various architectures presented in this research work. Â© 2021 IEEE.
MIMO radar ambiguity analysis of frequency hopping pulse waveforms
(2014) Sharma, G.V.K.; Srihari, P.; Rajeswari, K.R.
Radar systems employing multiple transmit antennas and multiple receive antennas have received great interest over the last decade. While single-input multiple-output (SIMO) radar systems employ only spatial diversity, multiple-input multiple-output (MIMO) radars employ both spatial and waveform diversity to improve the system performance. Waveform design for MIMO radars involves optimization of desired delay, Doppler and spatial resolution characteristics. Designs of frequency hopping waveforms that optimize the MIMO radar ambiguity function under small and large Doppler scenarios were recently proposed. These waveforms are obtained by optimizing an appropriately formulated cost function using modified simulated annealing algorithms. In this paper, the MIMO radar ambiguity properties of large sets of frequency hopping waveforms based on algebraic theory are analyzed and their relative performance are compared. � 2014 IEEE.
MIMO radar ambiguity analysis of frequency hopping pulse waveforms
(Institute of Electrical and Electronics Engineers Inc., 2014) Sharma, G.V.K.; Srihari, P.; Rajeswari, K.R.
Radar systems employing multiple transmit antennas and multiple receive antennas have received great interest over the last decade. While single-input multiple-output (SIMO) radar systems employ only spatial diversity, multiple-input multiple-output (MIMO) radars employ both spatial and waveform diversity to improve the system performance. Waveform design for MIMO radars involves optimization of desired delay, Doppler and spatial resolution characteristics. Designs of frequency hopping waveforms that optimize the MIMO radar ambiguity function under small and large Doppler scenarios were recently proposed. These waveforms are obtained by optimizing an appropriately formulated cost function using modified simulated annealing algorithms. In this paper, the MIMO radar ambiguity properties of large sets of frequency hopping waveforms based on algebraic theory are analyzed and their relative performance are compared. Â© 2014 IEEE.