Recent Breakthroughs in RF Photonics for Radar Systems

“…This has in turn led to renewed interest from the defence industry. In the last few years, work in this area has been published by several major defence institutions including Thales, Lockheed Martin, Northrop Grumman and US and European defence agencies [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Analogue RF over fibre links for future radar systems

2017

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“…Conventional radar signal distribution networks are designed with coaxial cable or space-feeds, which make the system bulky, complex, massive and inflexible [1,2]. The inherent advantages of optical link is reduced size, weight and loss, low attenuation, immunity to electro-magnetic interference (EMI), and high bandwidth capacity [3].…”

Section: Introductionmentioning

confidence: 99%

Feasibility analysis of WDM links for radar applications

Meena

Francis²,

Sarath³

et al. 2015

Defence Technology

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Active phased array antennas enhances the performance of modern radars by using multiple low power transmit/receive modules in place of a high power transmitter in conventional radars. Fully distributed phased array radars demand the distribution of various signals in radio frequency (RF) and digital domain for real time operation. This is normally achieved through complex and bulky coaxial distribution networks. In this work, we intend to tap the inherent advantages of fiber links with wavelength division multiplexed (WDM) technology and a feasibility study to adapt these links for radar applications is carried out. This is done by analysing various parameters like amplitude, delay, frequency and phase variation response of various radar waveforms over WDM links. This also includes performance evaluation of non-linear frequency modulation (NLFM) signals, known for better signal to noise ratio (SNR) to specific side lobe levels. NLFM waveforms are further analysed using pulse compression (PC) technique. Link evaluation is also carried out using a standard simulation environment and is then experimentally verified with other waveforms like RF continuous wave (CW), pulsed RF and digital signals. Synchronization signals are generated from this variable duty cycle digital signals during real time radar operation. During evaluation of digital signals, variable transient effects for different duty cycles are observed from an amplifier configuration. A suppression method is proposed to eliminate this transient effects. Further, the link delay response is investigated using different lengths of fiber spools. It can be inferred from the experimental results that WDM links are capable of handling various signals significant to radar applications.

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“…Recent studies have applied multifarious new techniques to radar systems [1][2][3][4][5][6][7][8][9]. Radar systems detect the position and velocity of a target based on received measurements.…”

Section: Introductionmentioning

confidence: 99%

Maneuvering Target Doppler-Bearing Tracking With Signal Time Delay Using Interacting Multiple Model Algorithms

Bi¹,

Ren²

2008

PIER

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Abstract-For maneuvering target Doppler-bearing tracking with signal time delay, a novel approach called ISE-IMM is proposed in this paper. The iterative state estimation (ISE) method is designed to eliminate the negative influence of time delay effect and an interacting multiple model (IMM) filter is embedded to estimate the state according to the measurements of the delayed signal. The nonlinear filter preferred in this paper is a particle filter (PF) with an improved resampling procedure. Performance of our proposed method is evaluated in Monte Carlo simulations. Results show the effectiveness and stability of ISE-IMM-PF in combating the negative effect of signal time delay.

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Recent Breakthroughs in RF Photonics for Radar Systems

Cited by 28 publications

References 8 publications

Analogue RF over fibre links for future radar systems

Analogue RF over fibre links for future radar systems

Feasibility analysis of WDM links for radar applications

Maneuvering Target Doppler-Bearing Tracking With Signal Time Delay Using Interacting Multiple Model Algorithms

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