An Experimental Comparison of Nondiversity and Dual Frequency Diversity for HF FSK Modulation

1968 ◽  
Vol 16 (6) ◽  
pp. 837-839 ◽  
Author(s):  
P. McManamon ◽  
R. Janc
Keyword(s):  
Experimental Comparison ◽  
Frequency Diversity ◽  
Dual Frequency

Alternating Dual-Pulse, Dual-Frequency Techniques for Range and Velocity Ambiguity Mitigation on Weather Radars

2010 ◽  
Vol 27 (9) ◽  
pp. 1461-1475 ◽  
Author(s):  
Sebastián Torres ◽  
Richard Passarelli ◽  
Alan Siggia ◽  
Pentti Karhunen
Keyword(s):  
Pulse Repetition ◽  
Single Frequency ◽  
Weather Data ◽  
Frequency Diversity ◽  
Sampled Data ◽  
Dual Frequency ◽  
Multiple Pulse ◽  
Uniform Sampling ◽  
Weather Radars ◽  
Repetition Time

Abstract This paper introduces a family of alternating dual-pulse, dual-frequency (ADPDF) techniques. These are based on frequency diversity and are proposed as a means to mitigate range and velocity ambiguities on Doppler weather radars. ADPDF techniques are analyzed theoretically and through simulated and real weather data collected with a prototype C-band radar. Analogous to single-frequency, multiple-pulse-repetition-time (mPRT) techniques, such as staggered or triple PRT, it is demonstrated that ADPDF techniques can extend the maximum unambiguous velocity beyond what is achievable with uniform sampling. However, unlike mPRT techniques, ADPDF techniques exhibit better statistical performance and, more importantly, may be designed to preserve uniform sampling on one of the frequency channels, thus avoiding some of the difficulties associated with processing nonuniformly sampled data.

scholarly journals Interpulse Frequency Diversity System for Second-Trip Suppression and Retrieval in a Weather Radar

2020 ◽  
Vol 37 (11) ◽  
pp. 2085-2099
Author(s):  
V. Chandrasekar ◽  
Mohit Kumar
Keyword(s):  
Doppler Radar ◽  
Dynamic Range ◽  
Weather Radar ◽  
Spectral Width ◽  
Performance Tests ◽  
Frequency Diversity ◽  
Cross Polarization ◽  
Dual Frequency ◽  
And Performance ◽  
Specific Phase

AbstractA new interpulse frequency diverse technique is introduced for weather radar second-trip suppression and retrieval. Interpulse coding is widely used for second-trip suppression or cross-polarization isolation. Here, a new interpulse scheme is discussed, taking advantage of frequency diverse waveforms. The simulations and performance tests are evaluated, keeping in mind NASA dual-frequency, dual-polarization, Doppler radar (D3R). A new method is discussed to recover velocity and spectral width despite the incoherence in samples due to the change of frequency from pulse to pulse. This technique can recover the weather radar moments over a much higher dynamic range of the second-trip contamination than the popular interpulse phase codes, for second-trip suppression and retrieval under specific phase noise conditions. And it has a bigger recovery region of second-trip velocity if the region is drawn with increasing spectral width (compared to other interpulse codes).

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