In the actual design of the sampling integral differential circuit of the IR-UWB proximity fuze receiver, it is impossible to guarantee the complete symmetry of the circuit due to the deviation of the component parameters, which leads to the inability of the receiver to filter out the noise completely. In order to study the effect of the scattering of component parameters in the circuit on the output of noise, this paper investigates the effect of noise in the circuit on the output signal waveform of the circuit under two cases of complete symmetry and asymmetry of the circuit, based on the model of ultra-wideband fuze receiver, respectively, to provide a theoretical basis for the selection and design of ultra-wideband fuze detector devices in the future.
KEYWORDS: Electric fields, Electrodes, Signal attenuation, Telecommunications, Prototyping, Wireless communications, Design and modelling, Capacitive coupling
In the cabin area communication scenario based on quasi-static electric field coupling, signal leakage will occur when a single channel or negative plate is grounded. This paper analyzes the cause of this problem through modeling and simulation, and proposes to use differential transmission in cabin area communication to solve the problem of signal leakage. Finally, a test prototype is made using FPGA and a test device is designed to verify the feasibility of this method.
The compact intensity-modulated frequency modulated continuous wave (FMCW) laser range sensor has a low signal-tonoise ratio(SNR) because the transmitting power is limited by heat dissipation conditions, and the detection performance is reduced in degraded visual environments. To increase the transmitting power and keep the heat low, the SNR enhancement technique using synchronized dual-laser sources is proposed. This paper established a mathematical model of the echo signal of the dual-laser sources, made a comparative analysis of the single and dual-channel laser beat signal. Aimed at the problem of unsynchronization of the two modulated signals caused by the drive circuit, a phase synchronization algorithm based on sampling feedback was proposed and verified by simulation. Finally, a synchronized dual-channel laser ranging system was built in the laboratory for experiments. Compared with a single-channel laser, the synchronized dual-channel laser transmitting power is doubled, and the echo signal SNR can be increased by 2.2dB. The experimental results indicate that the proposed SNR enhancement technique can effectively solve the problem of low SNR in compact intensity-modulated FMCW laser range sensor.
Researching attenuation characteristic of UWB signals propagation in free-space is necessary for ultra-wideband (UWB) radio fuze optimized design. Research attenuation characteristic of UWB signals propagation in free space can be achieved by learning attenuation characteristic of radio waves propagation in free-space and UWB signal power spectral density. 50ps, 100ps and 200ps of pulse width UWB fuze transmission narrow pulse signal propagation in free-space are simulated and analyzed. The attenuation of UWB signals at 3m, 6m and 9m are contrasted. The simulation, analysis and contrast is theoretical basis of UWB radio fuze optimized design.
Signal processing for an ultra-wideband radio fuze receiver involves some challenges: it requires high real-time performance; the output signal is mixed with broadband noise; and the signal-to-noise ratio (SNR) decreases with increased detection range. The adaptive line enhancement method is used to filter the output signal of the ultra-wideband radio fuze receiver, and thus suppress the wideband noise from the output signal of the receiver and extract the target characteristic signal. The filter input correlation matrix estimation algorithm is based on the delay factor of an adaptive line enhancer. The proposed adaptive algorithm was used to filter and reduce noise in the output signal from the fuze receiver. Simulation results showed that the SNR of the output signal after adaptive noise reduction was improved by 20 dB, which was higher than the SNR of the output signal after finite impulse response (FIR) filtering of around 10 dB.
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