High‐resolution range estimation using time delays in ultra‐wideband M‐sequence radar

Abstract

Getting a high range resolution is an important issue in many research areas and applications especially for narrowband system. Although wideband systems have a better condition from this viewpoint, they have additional challenges in terms of cost and RF manufacturing. Thus, overcoming the bandwidth constraint on the resolution can be a game changer in the simplicity and feasibility aspects of a system. In this paper, an accurate and efficient approach for high resolution range measurement is proposed. An ultra‐wideband (UWB) M‐sequence system is established for its simplicity and cost effectiveness compared to other methods like frequency modulated continuous wave (FMCW) and impulse technique. However, the limited usable bandwidth in the power spectrum of an M‐sequence signal degrades its resolution. We have alleviated this shortcoming by applying a Least squares (LS) estimator to improve the resolution and accuracy of the system. The acceptable performance of the presented method is verified experimentally and numerically by achieving 45% improvement in the resolution with the accuracy of more than 95%. By considering the effects of different parameters such as response of antenna, method of scan and systematic errors, the proposed method would be a good candidate for remote sensing applications.

Analysis and Suppression of Unwanted Turn-On and Parasitic Oscillation in SiC JFET-Based Bi-Directional Switches

“…The duty cycles of the delay time and the pulse width variation should be as small as possible. Generally, no larger than 1% is acceptable in practical applications [24,25]. Therefore, ∂ d-on-max , ∂ d-off-max and ∂ width-change-max is set to 0.01 in the test.…”

“…The difference is within 9 ns, which is minute. practical applications [24,25]. Therefore, ∂d-on-max, ∂d-off-max and ∂width-change-max is set to 0.01 in the test.…”

Statistical modelling comparison of wearable UWB signal propagation in antithetical corridor environments

“…UWB technology has found recent popularity in a range of radar and ranging applications including imaging [8, 9], medical solutions [10], rescuing and counting of humans [11, 12], localisation [13, 14], and automotive applications [15]. It also offers significant promise in other application areas [16] including wearable communications.…”