Polyphase-coded FM (PCFM) radar waveforms, part II: optimization

Physical emission of spatially‐modulated radar

“…12 realises a normalised aggregated bandwidth of 204, a 2% increase as predicted by (27). For the half-cycle sinusoidal Case 4 we must use the more general (28). However, this case experiences negligible spatial modulation at the beginning and ends of the pulse (per examination of Fig.…”

Optimization of “over-coded” radar waveforms

“…Here we consider different combinations of M = 1, 2 and L = 1, 2, 4, and 8. The (M = 1, L = 1) case reduces to the original CPM radar waveform implementation of [1,2] for which we will use an optimized PCFM waveform from [5]. For the other combinations further optimization is required.…”

“…The continuous phase modulation (CPM) implementation [1,2] has been shown to be effective at producing polyphase-coded FM (PCFM) waveforms with high spectral efficiency and that are amenable for high power operation. The optimization of PCFM waveforms has been demonstrated [3][4][5] to facilitate the design of physical radar emissions that even account for the distortion imparted by a high-power transmitter. In this work the underlying CPM implementation is re-examined to discern where additional design freedoms may be exploited.…”

Poly-phase signal generation and optimizationof LPI Radar: A new approach

“…Pulse modulation provides the advantages of phase coding and LFM method and hence Radar designers like this method [2].But in LPI Radar secrecy is more important and hence traditional method of pulse compression is not preferred. Binary signal and poly-phase signals have large main lobe to peak side lobe ratio of same code length but the structure of poly-phase waveform is more complicated and very difficult to detect and analyze by an enemies Electronic Investigation Measure [3]. Radar waveform design algorithm proposed [4] based on two different applications, target detection and target characterization, where communication signal scattered off the target and considered as an interference in the objective functions.LPI Radar uses a special waveforms proposed to avert a noncooperative intercept receiver from intercepting and detecting it's emission.…”

“…Another class of Radar signals, Poly-phase codes are useful for pulse compression applications. Low-range side lobes, compatibility with digital signals, low cross correlations, the Doppler tolerance, compatible with Band Pass limited receiver and ease of implementation are many useful features of Poly-Phase codes [3]. Binary codes have the phase constellation size of 2 and distributed over 2π phase.…”