Advantages and problems of wideband radar

Abstract

This paper addresses the definition, properties and modeling requirements of wideband and ultra-wideband radar;. It begins by establishing the criteria by which the designation 'wideband' might he specified, since the common def~tion based purely on relative bandwidth fails to invoke some important associations. Next, the role of simulation is discussed and a representative simulation environment is described. The advankges and disadvantages of increasing the signal bandwidth are then evaluated quantitatively in the context of signal detection, parameter measure-men< and the recognition of aerial target classes and types, with reference to specific classes of interest. ln practice, certain other issues arise, including the degree of immunity to interference and electromagnetic capability. These topics are discussed in terms of their dependence on signal bandwidth and the associated signal acquisition and processing. In addition, an emerging problem is the need to take into account the possibility of signal exploitation and LPI. The essence of the theory of unauthorized signal detection that limits the LPI possibilities is briefly considered.

Wideband cognitive radar waveform optimization for joint target radar signature estimation and target detection

“…Step 3: Optimize the transmission waveform P E,i (ω, l i ) with power constraint E i by algorithm 1 in Table I. Step 4: Calculate E e(ω) 2 2 corresponding to P E,i (ω, l i ) by (23) and evaluate ρ i by (24).…”

“…Compared with the narrowband radar, the wideband radar has more reliable detection and tracking performance and is not sensitive to active and passive interference [2]. It is able to provide more target information for target recognition, and provide larger degree of freedom for CR, i.e., frequency diversity, which is very important in intelligent transmitting.…”

Relationship of target recognition performance and radar waveform parameters

“…Refs. [2] and [3] show that widening the bandwidth of the transmitted signal can make target recognition easier, but the prob- 1 ability of error will hold when the bandwidth exceeds some threshold. Ref.…”

“…The conclusions in Refs. [2][3][4][5] may be unauthentic because they are obtained based on simulation experiments for given targets and lack of rigorous mathematical deduction. Once target models change, the conclusions may be inapplicable and times of new experiments will be needed.…”

High-precision angle estimation based on phase ambiguity resolution for high resolution radars

“…Thus, such waveforms can be completely adopted in highresolution radar systems without transmitting narrowband signals when a high degree of precision can be achieved for estimating the target angle using wideband or ultra-wideband waveforms, and this would benefit the dwell scheduling based on the high update rates of the track states [7]. Besides, wideband radars exhibit several distinct advantages, such as target-detection with decreased radar cross section (RCS) fluctuation losses, increased radar measurement accuracy, better interference immunity and electromagnetic compatibility [8]. Therefore, effective angle-estimation methods for RST are considered to be particularly important with respect to wideband radar systems.…”