Passive radar detection method for detecting low-altitude objective by satellite signal

Abstract

The invention relates to a passive radar detection method by use of synergistic or asynergistic satellite signals to detect low altitude targets, belonging to the technical field of space technology, which comprises a satellite and a ground passive radar system; wherein, the system comprises a plurality of detection stations and a data processing station, and interactive communications are conducted between the detection stations and the data processing station by means of radio or optical fiber transmission method. The signals, expanded frequency measurement codes and the signals reflected on low altitude aircrafts by and of the satellite, especially high radiation power satellite, are received by the detection station receivers of the passive radar with high sensitivity. After correlation, the path difference between the direct radiation signals of the satellite and the signals from the same source reflected by the low altitude targets can be derived; then, a group of passive detection equations can be established; the solutions can be obtained simultaneously. And a three-dimensional position coordinate of the low or super low altitude targets can be thus acquired. The invention has the advantages of huge detection area, small blind area, the capability of detecting low or super low aircrafts like cruise missiles and super low altitude airplanes passively at long range, and extensive application value for military use.

Description

technical field [0001] The invention relates to the field of space technology and belongs to the technology of passive detection of space targets. Background technique [0002] Stealth aircraft, electronic jamming, anti-radiation missiles, and ultra-low-altitude raids have become the four major threats to traditional radars. With the development and maturity of electronic technology and electromagnetic theory, many measures against the above-mentioned threats have been proposed in the field of radar, including the use of specially designed waveforms to achieve low detectability, improving the maneuverability of radar to prevent attacks from anti-radiation missiles, using Low-elevation radar system, etc. However, the detection and early warning of ultra-low-altitude cruise missiles have great limitations, mainly because ultra-low-altitude cruise missiles use the physical limitations of the curvature of the earth to reduce the effective detection range of radars, thereby shor...

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Problems solved by technology

FM broadcasting, terrestrial TV and communication stations generally emit horizontal non-directional beams, which are affected by the curvature of the earth so that the coverage ar

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