A novel handheld pseudo random coded UWB radar for human sensing applications

Abstract

A novel handheld pseudo random coded ultra-wideband (UWB) radar for human sensing applications is presented in this paper. In order to reduce the size of the radar and obtain good penetrability, the center frequency of the m-sequence is assigned to about 1.1 GHz. The peak voltage of the m-sequence is 4.5 Vpp, while the length of the m-sequence can be chosen to obtain different signal-to-noise ratio (SNR). The digital transmitter, the dual-channel receiver and the clock synchronization are discussed in detail. The experimental results show that the proposed handheld pseudo random UWB radar has good detection performance for human sensing applications in complex environment.

Detection of Quasi-Static Trapped Human Being Using Mono-Static UWB Life-Detection Radar

“…The existing coding methods include m-sequence, Gold sequence and Golay complementary sequence. Based on the previous research on the pseudo-random codes' technology [16,27], the Golay complementary sequence is composed of coded signal A and coded signal B, and the autocorrelation functions of these two codes can eliminate the side lobes remarkably. The amplitude of signal peak can be double.…”

“…Table 1 lists the main parameters and characteristics of radars published in commercial and academic papers. The novel [24] UESTC * (China) 5 SFCW * radar, dual-station "RF-Capture" [22] MIT * (USA) 3 FMCW radar, MIMO, 5.46~7.24 GHz Xia [16] IECAS * (China) 12.5 Pseudo-random radar, portable…”

Method to improve degraded range resolution due to non-ideal factors in FMCW radar

“…Non-ideal factors include the reduced effective modulation bandwidth due to timeof-flight delays, the increased main-lobe null-to-null bandwidth when FFT windows are applied, and non-linearity of frequency sweeps [3,4,5]. Various studies have been reported to improve range resolution, such as increasing bandwidth [6], using triangular sweep signal [7], over-sampling [8], and removing aliasing effects [9]. However, since these methods cannot suppress non-ideal effects on range resolution, range resolution can be further improved by compensating for non-ideal factors.…”

A High Signal–Noise Ratio UWB Radar for Buried Pipe Location Using Golay Complementary Sequences

“…In order to expand the detectable range without degrading the resolution, large time-bandwidth signals are used as the transmit signals in recent years, such signals include frequency modulated continuous wave (FMCW) signals [9][10][11], stepped frequency signals [12][13][14], code signals [15][16][17], and chaotic signals [18][19][20]. UWB GPR based on FMCW signals or stepped frequency signals suffer from having strong sidelobes [21], thereby resulting in low signal-noise ratio (SNR).…”