A fast parameter estimation algorithm for polyphase coded CW signals

Abstract

A fast parameter estimation algorithm is discussed for a polyphase coded Continuous Waveform (CW) signal in Additive White Gaussian Noise (AWGN). The proposed estimator is based on the sum of the modulus square of the ambiguity function at the different Doppler shifts. An iterative refinement stage is proposed to avoid the effect of the spurious peaks that arise when the summation length of the estimator exceeds the subcode duration. The theoretical variance of the subcode rate estimate is derived. The Monte-Carlo simulation results show that the proposed estimator is highly accurate and effective at moderate Signal-to-Noise Ratio (SNR).

FHSA: fractional harmony search algorithm for polyphase code design in radar signal processing

“…This model IJPCC 19,3 changes the population size for the exploitation and the exploration phase. Hong et al (2011) have proposed the fast parameter estimation algorithm to design the polyphase code. The proposed algorithm has reduced computational complexity.…”

“…The design of the polyphase code with better coherency and the correlation can be taken as the optimization problem (Singh and Subba Rao, 2006). Some of the algorithms, such as genetic algorithm (GA) k-nearest neighbor (Nikhath et al , 2016) and particle swarm optimization (PSO), have been used in the existing papers (Sergio et al , 2012; Zhang and Zhang, 2016; Hong et al , 2011; Paolo et al , 2012; De Maio et al , 2008; Singh and Subba Rao, 2006) to improve the coherency and the correlation of the polyphase code (Sur et al , 2021). The existing models design the polyphase code by defining an individual fitness value using the objective function.…”

“…It searches for the optimal solution from the legal area (Zeng et al , 2011). The existing techniques estimate the subcode rate and the modulation period (Hong et al , 2011). In dynamic environments, the signal suffers from the Doppler shift.…”

Influences of SEN structures on flow characters, temperature field and shell distribution in 420 mm continuous casting mould

“…Recent continuous casting technology developments in the casting of ultrathick slab have resulted in thick plate being rolled directly from ultrathick slabs, with an added advantage in terms of high production capacity, excellent mechanical properties and surface quality. 5 However, internal looseness and segregation and surface and subsurface defects in the slab may produce difficulties in the final plate. Therefore, a proper understanding of slab characteristics and influences given by the mould is of great importance for achieving satisfactory properties in the as cast slab.…”

“…Traditionally, directional solidification method1 – 3 and electroslag remelting technology4 were employed to produce ultrathick alloy or steel slabs. Recent continuous casting technology developments in the casting of ultrathick slab have resulted in thick plate being rolled directly from ultrathick slabs, with an added advantage in terms of high production capacity, excellent mechanical properties and surface quality 5. However, internal looseness and segregation and surface and subsurface defects in the slab may produce difficulties in the final plate.…”