A time-reversal-based method for target detection with non-equally spaced sampling in ultra-wideband frequency domain
A time-reversal and non-equal interval technology, applied in the radar field, can solve problems such as echo power weakening, lack of attention, echo power enhancement, etc., and achieve the effects of reducing data volume, improving detection probability, and high signal-to-noise ratio
Active Publication Date: 2021-07-16
XIDIAN UNIV
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Problems solved by technology
The time-reversed echo, at some frequency points, the corresponding echo data amplitude will be stronger than the echo amplitude without time-reversed, but at other frequencies, the time-reversed echo amplitude becomes smaller , that is, the echo power of some frequencies is enhanced, and the echo power of some frequencies is weakened
The current research does not pay attention to this characteristic, and all the echoes of all frequency points are used for target detection
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[0046] The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.
[0047] A time-reversal-based ultra-broadband echo non-equally spaced sampling target detection method, comprising the following steps:
[0048] Step 1, get H(ω q ), where the echo is Y 0 (ω q )=S(ω q )H(ω q )+V(ω q ), S(ω q ) is the transmitted signal spectrum, H(ω q ) is the target frequency response, V(ω q ) is additive Gaussian white noise, q=0,1,...,Q-1;
[0049] Step 2, let Z 0 (ω q )=S(ω q )H(ω q ), for Z 0 (ω q ) to do time inversion, that is, to take the conjugate in the frequency domain, to get then to Do energy normalization to get time-reversed emission signal Among them, Z 0 (ω q ) is the transmitted signal spectrum S(ω q ), k is the energy normalization coefficient;
[0050] Step 3, transmit signal according to time reversal The simulation calculates the echo ...
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The invention belongs to the technical field of radar, and specifically relates to a method for detecting an ultra-broadband echo non-equally spaced sampling target based on time inversion. Step 1 obtains the target frequency response according to the echo and transmitted signal spectrum; Obtain the spectrum echo signal of the transmitted signal after energy normalization from the signal spectrum; step 3 obtain the echo signal after inversion under the condition of no noise according to the spectrum echo signal of the transmitted signal after energy normalization, and compare it with the transmitted signal after energy normalization Comparing the signal spectrum echo signals to obtain a number of frequency points; step 4 calculates the echo signal of the energy-standardized transmitted signal spectrum echo signal after inversion under the condition of no noise; step 5 obtains the detection result according to the frequency points. The invention has the beneficial effects of high detection probability, high signal-to-noise ratio and anti-multipath effect.
Description
technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a method for detecting an ultra-broadband echo non-equally spaced sampling target based on time inversion. Background technique [0002] Target detection in noisy environments is a fundamental function of radar, and target detection performance is affected by signal bandwidth. With the development of technology, UWB is widely used in the field of radar. Because UWB radar has a larger bandwidth than narrowband radar, it has higher range resolution and can obtain more target information. Ultra-wideband radar is widely used in medical imaging, ground-penetrating radar and wall-penetrating radar, so it is of great significance to study ultra-wideband radar. UWB radar target detection technology is a key technology of UWB radar. In ultra-wideband radar, the target is no longer a point target, but an extended target composed of multiple point scatterers. For this type of t...
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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 陈伯孝张钊铭杨明磊
Owner XIDIAN UNIV