Open AccessProceedings Article10.1109/RADAR.2018.8378691

Waveform-diverse stretch processing

- 23 Apr 2018

- pp 0963-0968

TL;DR: Here the final fast Fourier transform (FFT) stage is replaced by a compensation transform that permits the use of other chirp-like nonlinear FM (NLFM) waveforms without changing the rest of the RF receive chain, thereby facilitating greater diversity in theUse of wideband waveforms for legacy radar systems.

Abstract: Stretch processing is widely used as a means to pulse compress the echoes produced by wideband LFM waveforms at a lower sampling bandwidth while still preserving high range resolution. Here the final fast Fourier transform (FFT) stage is replaced by a compensation transform that permits the use of other chirp-like nonlinear FM (NLFM) waveforms without changing the rest of the RF receive chain, thereby facilitating greater diversity in the use of wideband waveforms for legacy radar systems. The efficacy of this approach is experimentally demonstrated using open-air measurements.

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Stretch processing with the use of a wideband LFM transmit waveform is a commonly used technique, and its popularity is in large part due to the large time-bandwidth product that provides fine range resolution capabilities for applications that require it.

Figure 2.11: Matched filter response for an LFM generated using a PCFM implementation

Table 3.1: Table of relevant parameters of waveforms

Figure 3.25: The spectral content of the S-NLFM waveform compared with the frequency template that was used to create it

Figure 2.9: Power spectral densities of LFM and NLFM waveforms with identical bandwidths

Figure 2.8: Time-frequency relationship for a generic NLFM waveform with bandwidth B and pulse duration T

Citations

Linear Frequency Modulation Derived Polyphase Pulse-Compression Codes and an Efficient Digital Implementation.

B L Lewis, +1 more

- 02 Nov 1981

TL;DR: In this paper, the authors introduced a new class of polyphase pulse-compression codes and techniques for use in digitally coded radars, which are more doppler tolerant than other phase codes derived from a step approximation to a linear frequency modulation waveform.

...read moreread less

178

•Journal Article•10.1109/TVT.2019.2953305

Phase-Coded FMCW Automotive Radar: System Design and Interference Mitigation

Faruk Uysal

- 01 Jan 2020

- IEEE Transactions on Vehicular Technolog...

TL;DR: An improved interference mitigation method based on a phase-coded linear- frequency-modulated (LFM) continuous waveform and points out the improvements in the signal-to-interference ratio (SIR).

...read moreread less

152

•Book Chapter

Waveform Design and Diversity for Advanced Radar Systems

Christopher Baker, +2 more

- 01 Jan 2012

TL;DR: This new flexibility demands new ways of characterising waveform properties and optimizing waveform design as mentioned in this paper, which is essentially the subject of waveform diversity, and is the basis for our work.

...read moreread less

126

Journal Article•10.1109/TAES.2020.3037403

Gradient-Based Optimization of PCFM Radar Waveforms

Charles A. Mohr, +4 more

- 01 Apr 2021

- IEEE Transactions on Aerospace and Elect...

TL;DR: Here, the continuous nature of this framework is leveraged to formulate a gradient-based optimization approach that updates all parameters simultaneously and can be efficiently performed using fast Fourier transforms, thus facilitating a general design methodology for practical waveforms that is directly extensible to myriad waveform-diverse arrangements.

...read moreread less

Proceedings Article•10.1109/RADAR.2019.8835668

FMCW Implementation of Phase-Attached Radar-Communications (PARC)

Patrick M. McCormick, +3 more

- 22 Apr 2019

TL;DR: The phase-attached radar-communications framework is extended to an FM continuous-wave (FMCW) operation which maximizes both data throughput and energy on target and it is found that the FMCW version introduces Doppler-spread clutter resulting from range sidelobe modulation (RSM), thus necessitating subsequent steps be taken to compensate.

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References

Journal Article•10.1109/TIT.1963.1057798

Polyphase codes with good nonperiodic correlation properties

R. Frank

- 01 Jan 1963

- IEEE Transactions on Information Theory

TL;DR: N -phase Codes are described which have an autocorrelation function with one main peak and very small side peaks and doppler shift effects appear to be similar to those of linear FM radar pulse compression.

...read moreread less

1.2K

Journal Article•10.1002/J.1538-7305.1960.TB03942.X

The theory and design of chirp radars

John R. Klauder, +3 more

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- Bell System Technical Journal

TL;DR: This paper contains many of the important analytical methods required for the design of a Chirp radar system, and a method to reduce the time side lobes by weighting the pulse energy spectrum is explained in terms of paired echoes.

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•Book

Principles of Modern Radar

Jerry L. Eaves, +1 more

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TL;DR: This chapter discusses the basic elements of the Radar System, as well as factors external to the Radar, and the ECCM Considerations and Techniques.

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872

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Radar Signals: An Introduction to Theory and Application

Charles E. Cook, +1 more

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TL;DR: The basic elements of matched filtering and pulse compression optimum pre-detection processing matched-filter waveform considerations the measurement accuracies of matched filter radar signals the design of dispersive delay functions ultrasonic delay lines microwave and optical matched filter techniques as mentioned in this paper.

...read moreread less

811

Patent

Synthetic aperture radar

Yoshihisa Hara, +1 more

- 13 Dec 1994

TL;DR: In this article, the authors proposed to enhance the resolution without sacrificing the image quality by additionally providing a plurality of sub-apertures, hybrid synthetic units and phase shifters and providing two systems of transmitter, receiver and A/D converter.

...read moreread less

754

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Waveform-diverse stretch processing

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Citations

Linear Frequency Modulation Derived Polyphase Pulse-Compression Codes and an Efficient Digital Implementation.

Phase-Coded FMCW Automotive Radar: System Design and Interference Mitigation

Waveform Design and Diversity for Advanced Radar Systems

Gradient-Based Optimization of PCFM Radar Waveforms

FMCW Implementation of Phase-Attached Radar-Communications (PARC)

References

Polyphase codes with good nonperiodic correlation properties

The theory and design of chirp radars

Principles of Modern Radar

Radar Signals: An Introduction to Theory and Application

Synthetic aperture radar

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