Passive detection system and method for detecting low-altitude target by using navigation radar signals

Abstract

The invention discloses a passive detection system for detecting a low-altitude target by using navigation radar signals and relates to the field of passive radars. The passive detection system comprises a non-cooperative navigation radar, a passive receiving system, a signal information processing module and a geographic information module used for displaying positioning results. The invention further discloses a method for passively positioning the low-altitude target by using the navigation radar. The method includes steps that: 1 the passive receiving system measures arrival angles of a direct arrival signal and a target echo; 2 direct arrival pulses are adopted to estimate the azimuth angle of a navigation radar emitting antenna scanning from a direct arrival path to a target reflection path; 3 the signal information processing module is adopted to obtain time delay of the target echo relative to the direct arrival signal; 4 measurement is obtained, a triangle formed by the navigation radar, the target and the passive receiving system is solved and three-dimensional coordinates of the target are obtained; and 5 the target position is given on an electronic map. The passive detection system and method have the capability of detecting the low-altitude target for maintaining electromagnetic silence and can achieve situation monitoring and early warning.

Description

1. Technical field [0001] The invention belongs to the technical field of passive radar, and in particular relates to the passive detection technology of a low-altitude target by using navigation radar signals on a sea movement platform. 2. Background technology [0002] In modern warfare, due to the development of electronic offensive technology, active radar radar systems are facing increasingly serious threats from advanced weapons such as anti-radiation missiles and stealth aircraft, as well as combat methods such as integrated electronic interference and low-altitude penetration. Therefore, in order to improve the survivability of the radar and give full play to the effectiveness of the radar, various countermeasures must be adopted comprehensively. [0003] In the field of traditional active radar, many measures against the four major threats have been proposed, including the use of specially designed signal waveforms to achieve low interception, improving the mobility...

AI Technical Summary

Problems solved by technology

However, in contrast, in the open sea area, due to the limitations of the available signals on the mobile platform, there have been no reports on the passive detection system of the ship-borne, submarine-borne and other maritime mobile platforms. It is almost impossible to receive civilian signals such as radio and television

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