Navigation radar for FMCW (frequency-modulated continuous wave) ship

Abstract

The invention discloses a navigation radar for an FMCW (frequency-modulated continuous wave) ship. The navigation radar comprises a display and control terminal subsystem, an antenna feeder subsystem, an exciter and timer subsystem, a receiver subsystem and a signal processing subsystem, wherein the receiver subsystem is connected with the antenna feeder subsystem, the signal processing subsystem and the display and control terminal subsystem, the signal processing subsystem is connected with the display and control terminal subsystem, the display and control terminal subsystem is connected with the exciter and timer subsystem, and the antenna feeder subsystem is connected with the exciter and timer subsystem. A microstrip antenna which is independently researched and developed is used in the navigation radar, so that the isolation degree of the antenna is improved, the leakage problem of a transmitter is basically solved, and a good foundation is laid for late-stage echo receiving and signal processing; SFC (synthesizable frequency calibration) filtration is used at second intermediate frequency for performing attenuation on echoes of a short-range target, so that the dynamic range of a receiver can achieve 100dB; and through a signal modulation way, distance-Doppler coupling is avoided within the using range of the navigation radar, and the navigation radar further has very high reliability and is particularly suitable for small and medium-sized ships.

Description

technical field [0001] The invention relates to a radar, in particular to an FMCW marine navigation radar, which belongs to the technical field of radar navigation. Background technique [0002] Linear Frequency Modulated Continuous Wave (FMCW) radar has the advantages of high range resolution, low transmit power, high receiving sensitivity, simple structure, etc. There is no distance blind spot, and it has better anti-stealth, anti-background clutter and anti-jamming capabilities than pulse radar. It is especially suitable for close-range applications. In recent years, it has developed rapidly in both military and civilian applications. The main advantages can be attributed to the following three aspects: [0003] 1. The biggest advantage of FMCW is that its modulation is easily realized by a solid-state transmitter; [0004] 2. To extract the distance information from the FMCW system, the frequency information must be processed, and now this step can be done by a process...

AI Technical Summary

Problems solved by technology

[0010] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a FMCW marine navigation radar, which can effectively solve the problem of emission leakage, improve the sensitivity of the receiver, make the whole machine work normally, and complete the large dynamic range of the receiver. designed to avoid range-Doppler coupling of moving targets at sea

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