Height measurement method for continuous wave search radar

Abstract

The invention discloses a height measurement method for a continuous wave search radar. In the method, a multi-port network is adopted to receive a pair of wave beams in mirror image distribution generated by a pitching surface of an antenna array; a slot waveguide and two output ports are distributed on the multi-port network; the two output ports of the multi-port network are connected to input ends of two paths of symmetric microwave receivers respectively; the used microwave receivers are superheterodyne receivers; the two paths of microwave receivers change the received echo to be intermediate frequency through amplification, frequency mixing and filtration and generate I and Q-baseband signals through amplification of an amplification filter and orthogonal demodulation; the I and Q-baseband signals are converted into digital quantity through A / D (Analog to Digital) conversion; modulo operation is performed through a signal processing module; a directional value is solved by using a sum-difference device; and a numerical value of an elevation angle is obtained from a pulse-out meter or through polynomial fitting by taking the directional value as an address. The method is easy to implement, has high data rate and is suitable for a small-sized three-coordinate search radar.

Description

technical field [0001] The invention belongs to the altimetry technology of small air-to-air search and target indication radar, and relates to an altimetry method of continuous wave search radar. Continuous wave three-coordinate search radar. Background technique [0002] The current three-coordinate search radar basically adopts the working mode of the pulse system, especially the widely popular phase-scan antenna search radar, because it uses time separation to alternately work in different elevation beams, so it is not suitable for the continuous wave working system, so in It is difficult to realize three coordinates in continuous wave radar. However, the advantages of continuous wave radar equipment, such as simple equipment, high receiving sensitivity, low transmission power, and a certain low probability of interception, have attracted many designers, so that radar designers continue to explore the technology of three-coordinate altimetry in the continuous wave syste...

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Problems solved by technology

[0002] The current three-coordinate search radar basically adopts the working mode of the pulse system, especially the widely popular phase-scan antenna search radar, because it uses time separation to alternately work in different elevation beams, so it is not suitable for the continuous wave working system, so in It is difficult to achieve three coordinates in continuous wave radar

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