Frequency-domain super-resolution micro-multipath height finding method of sky-wave beyond visual range radar
An over-the-horizon radar and super-resolution technology, applied in radio wave measurement systems, measurement devices, radio wave reflection/re-radiation, etc.
Inactive Publication Date: 2013-04-17
AIR FORCE EARLY WARNING ACADEMY
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[0005] The purpose of the present invention is to provide a sky-wave over-the-horizon radar frequency-domain super-resolution micro-multipath altimetry method, solve the difficulties and problems faced by the sky-wave over-the-horizon radar system in the target height measurement, and overcome the shortcomings and deficiencies of the prior art
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[0049] The key to using micro-multipath altimetry lies in the resolution of target distance and Doppler frequency parameters between micro-multipath signals. However, in conventional radar equipment, the signal bandwidth and coherent accumulation time, which are closely related to the target distance and Doppler frequency resolution ability, are restricted by various factors such as system cost and external environment, and are far from being able to provide micro-multipath altimetry. Discrimination ability is required. This huge gap cannot be made up by unilaterally relying on the improvement of algorithm resolution. In this context, we should make full use of the prior conditions of micro-multipath signals obtained by ionospheric parameter measurement, and use the limited range of multipath signals under the premise of insufficient resolution Matching processing provides a technical idea to solve this key problem.
[0050] The matching processing method is the embodiment of...
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The invention discloses a frequency-domain super-resolution micro-multipath height finding method of a sky-wave beyond visual range radar, wherein the frequency-domain super-resolution micro-multipath height finding method is suitable for a signal processing system of the sky-wave beyond visual range radar. The frequency-domain super-resolution micro-multipath height finding method comprises the following specific steps of: filtering an interested target and multipath signals thereof by using band-pass FIR (Finite Impulse Response) filtering; estimating a mean distance value of the interested target by using a super-resolution method, and designing a distance rectangular projection matrix to filter and remove partial redundant micro-multipath signals; forming a Doppler domain weighted signal sub-space, estimating a mean Doppler value of the Doppler domain weighted signal sub-space; and calculating a Doppler parameter by using a micro-multipath model, correcting by using the mean Doppler value to form a Doppler projection matrix, matching the weighted signal sub-space with the Doppler projection matrix, searching to obtain the estimated height value of the target, wherein the specific steps are shown in figure 1. The method has the advantage of reducing the probability of matching failure caused by noise and parameter errors of an ionization layer. The technology disclosed by the invention is not limited to a sky-wave beyond visual range radar system and can be widely applied to a target height finding occasion with a ground multipath effect, and has popularization and application values.
Description
technical field [0001] The invention relates to a radar height measuring method in the field of radar signal processing, which is suitable for a signal processing system of sky-wave over-the-horizon radar and can be used for target height measurement under multipath conditions. At the same time, the core theory and method can also be applied to other signal processing systems that require target height estimation. Background technique [0002] Sky-wave over-the-horizon radar uses the refraction of electromagnetic waves by the ionosphere to detect targets beyond the visual range. It has a long working distance and a large coverage area, and can provide strategic early warning intelligence information. However, due to its top-down detection method, conventional methods can only provide target distance, target azimuth, and Doppler frequency, but cannot provide target height information, which brings difficulties to improve target positioning accuracy, and achieve rough classifi...
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Inventor 陈建文鲍拯江鹏飞
Owner AIR FORCE EARLY WARNING ACADEMY