Introduction to Radar Systems.Merrill I. Skolnik. McGraw-Hill Book Co., London and New York. 1962. 648 pp. Illustrated. £5 12s. 6d.

Dell, Helen

doi:10.1017/s0368393100078755

Cited by 2 publications

(6 citation statements)

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“…The noise is modeled as q(t) = √ γq a (t) + q γ (t) [33], where q a (t) is the amount of noise that enters the antenna and q γ (t) is the noise introduced by the LNA. q a (t) ∼ N (0, kTa 2 ) is modeled as a zero-mean additive white Gaussian noise (AWGN) with variance kTa 2 , where T a [K] is the antenna temperature [34] and k = 1.38 × 10 −23 [W • s/K] is the Boltzmann constant. q γ (t) ∼ N (0, kTγ 2 ), where T γ [K] is the noise temperature of the LNA.…”

Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

“…, where r(t) = r(t)e −j2πfct and q ′ (t) = (q(t)e −j2πfct ) * z(t). If the gain of the first amplifying stage is large, noises introduced by the subsequent components have a diminishing effect on the SNR according to the Friis formula [34]. Since γ is typically a large value, the noise introduced by other components is considered negligible for convenience.…”

Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

“…The baseband equivalent noise q[n] ∼ CN (0, γkT sys f BW ) is a zero-mean circularly symmetric Gaussian noise with variance γkT sys f BW [5], where f BW [Hz] is the channel bandwidth, and the system noise temperature is defined as [34], where T a is the antenna temperature and T e is the effective noise temperature. Since we only consider the noise introduced by LNA, T e = Tγ γ in our case.…”

Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

“…Since we only consider the noise introduced by LNA, T e = Tγ γ in our case. Given the noise factor N f [dB], one can calculate T e = (10 0.1N f [dB] − 1)T 0 , where T 0 = 290 [K] is the standard temperature [34].…”

Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

“…is the antenna impedance, and P s is defined in (11). Also, since the baseband noise derived in ( 9) is q[n] ∼ CN (0, γkT sys f BW ), the noise power is evaluated as [5], [34]…”

Section: B Received Snr Derivationmentioning

confidence: 99%

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Waveform Optimization for Multiple Beam Communications under Radar Constant Modulus Constraints

Zhou¹,

Xie²,

Liu³

et al. 2021

2021 IEEE Wireless Communications and Networking Conference (WCNC)

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Satellite communications (SatComs) are anticipated to provide global Internet access. Low Earth orbit (LEO) satellites (SATs) have the advantage of providing higher downlink capacity owing to their smaller link budget compared with medium Earth orbit (MEO) and geostationary Earth orbit (GEO) SATs. In this paper, beam-broadening algorithms for uniform rectangular arrays (URAs) in LEO SatComs were studied. The proposed method is the first of its kind that jointly considers the path loss variation from SAT to user terminal (UT) due to the Earth's curvature to guarantee quality of service (QoS) inspired by the synthesis of isoflux radiation patterns in the literature, constant modulus constraint (CMC) favored for maximizing power amplifier (PA) efficiency, and out-ofbeam radiation suppression to avoid interference. A URA design problem is formulated and decomposed into two uniform linear array (ULA) design subproblems utilizing the idea of Kronecker product beamforming to reduce the computational complexity of designing URA. The non-convex ULA subproblems are solved by a convex iterative algorithm. Simulation results reveal the advantages of the proposed method for suppressing out-of-beam radiation and achieving design criteria. In addition, channel capacity evaluation is carried out and shows that the proposed "broadened-beam" beamformers can offer capacities that are at least four times greater than "narrow-beam" beamformers employing an array steering vector when beam transition time is taken into account. The proposed method holds potential for LEO broadcasting applications such as digital video broadcasting (DVB).Index Terms-Satellite communications (SatComs), low Earth orbit (LEO) satellite, beampattern synthesis, beam-broadening algorithm, isoflux radiation pattern, constant modulus constraint (CMC), Kronecker product beamforming, uniform rectangular array (URA), uniform linear array (ULA), Digital video broadcasting (DVB).

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Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

Section: A Uniform Rectangular Array (Ura)mentioning

confidence: 99%

“…is the antenna impedance, and P s is defined in (11). Also, since the baseband noise derived in ( 9) is q[n] ∼ CN (0, γkT sys f BW ), the noise power is evaluated as [5], [34]…”

Section: B Received Snr Derivationmentioning

confidence: 99%

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