One-Bit LFMCW Radar: Spectrum Analysis and Target Detection

Abstract

One-bit radar involving direct one-bit sampling is a promising technology for many civilian applications due to its low-cost and low-power consumptions. In this paper, problems encountered by one-bit LFMCW radar are studied and a two-stage target detection approach termed as DR-GAMP is proposed.Firstly, the spectrum of one-bit signal in a scenario of multiple targets is analyzed. It is indicated that high-order harmonics may result in false alarms (FAs) and cannot be neglected. Secondly, DR-GAMP is used to suppress the high order harmonics. Specifically, linear preprocessing and predetection are proposed to perform dimension reduction (DR), and then, generalized approximate message passing (GAMP) is utilized to suppress high-order harmonics. Finally, numerical simulations are conducted to evaluate the performance of one-bit LFMCW radar with typical parameters. It is shown that compared to conventional radar with linear processing approach, one-bit LFMCW radar has 0.5 dB performance gain when the input signal-to-noise ratios (SNRs) of targets are low. Moreover, it has 1.6 dB performance loss in a scenario with an additional high SNR target.

Energy-efficient renewable scheme for rechargeable sensor networks

“…Then, the node with the highest power and the node with the lowest power can be calculated, which correspond to the 48th node and the 12th node, respectively. So the number of set needs to be classified is r = 12, which can be calculated by (11). The result of the classified set S k is shown in Table 3.…”

“…Surprisingly, this new technology is immune to the surrounding environment. Compared with other WET technologies such as electro-magnetic radiation [10,11], magnetic resonant coupling has many significant advantages including higher energy conversion efficiency, further transmission distance, and no requirement of line-of-sight.…”

One-Bit LFM Pulse Radar: Harmonic Analysis and Target Reconstruction

“…However, for scenarios with moderate-to-high SNRs, high-order harmonics can not be omitted again. In [19], it is claimed that for the fully digital radar, the digital integration gain can be larger than 60 dB and high harmonics can results in false alarms (FAs). In [16], applying the one-bit ADC, the issue of deceptive jamming against synthetic aperture radar (SAR) is addressed.…”

“…Results show that nonlinear methods are effective to eliminate high-order harmonics. Unfortunately, when all three domains, i.e., the spatial, slow time and fast time domain, are considered for the fully digital radar, the number of observations in one coherent pulse interval (CPI) is generally very large [19]. The large dimension of the signal observation model makes the current nonlinear methods incapable to work again.…”

“…In [19], spectrum of one-bit signals and target detection method for the LFMCW radar are studied. The received signal model before one-bit quantization in each of the three domains is established as a sum of sinusoidals, and after one-bit ADC, it is shown that higher-order harmonics are all discrete frequencies and can lead to target-like FAs.…”