Pulse ultra-wideband direction finding method based on PDOA

Abstract

The invention provides a pulse ultra wide band direction finding method based on PDOA. The method comprises the following steps: receiving an ultra wide band radio frequency signal transmitted by a UWB tag by using a double-antenna double-channel ultra wide band radio frequency receiver; using a local ultra-wideband lead pulse matched filter to obtain a discrete multipath channel impulse response estimation result; constructing a time domain mask, and setting multipath energy in the baseband complex signal to zero; fourier transform is carried out on the two sets of baseband time domain complex signals only containing first-diameter pulses, and amplitude values of frequency points in bandwidths of the two sets of baseband frequency domain complex signals are obtained; performing cross-correlation processing on the two groups of baseband frequency domain complex signals, and calculating a phase difference to obtain a normalized phase difference sequence; obtaining the phase difference of the ultra-wideband radio frequency signal arriving at the two antenna ports; and the arrival incident angle of the UWB radio frequency signal emitted by the UWB tag is calculated. According to the pulse ultra-wideband direction finding method based on the PDOA provided by the invention, high-precision space direction finding is realized under a complex multi-path channel by only using two antennas.

Description

technical field [0001] The embodiment of the present invention relates to the field of ultra-wideband technology, in particular to a PDOA-based pulse ultra-wideband direction finding method. Background technique [0002] As the Ultra Wideband (UWB for short) technology is increasingly popularized in daily life, in addition to its excellent ranging function, it also benefits from its high-precision direction finding function. The most commonly used technology for UWB direction finding is based on Phase Difference of Arrival (PDOA), which has the advantage of a small antenna array compared to the technology implemented by Time Difference of Arriva (TDOA). . [0003] The classic method for direction finding of broadband signals does not convert the broadband signals received by each channel in the antenna array to the frequency domain, and then use the principle of direction finding of narrowband signals to distinguish the incident direction of all signal sources in the signal...

AI Technical Summary

Problems solved by technology

However, in practical application scenarios, since the bandwidth of ultra-wideband signals can usually reach 500MHz or even 1GHz, it is usually difficult for RF transceivers to ensure the same fading in the entire frequency band. In addition, wireless channels will also cause frequency selective fading, which will lead to The UWB signal received by the baseband receiver has a significant I / Q imbalance. As a result, performing PDOA estimation directly using the UWB signal introduces considerable error

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