A method and system for ranging from a monopulse radar without a blind zone with a protection channel

Abstract

The invention discloses a single-pulse radar non-blind zone ranging method and system with a protection channel, which includes a slot array main antenna, a protection antenna, a high-frequency head, a circulator, an intermediate frequency receiver, a signal processor, a secondary power supply, and a transmitter. machine. The invention is a monopulse system, and the main antenna of the slot array periodically transmits high-frequency pulse signals, and the protection antenna receives the target echo signal in real time; one transmission and one reception realizes the separation of sending and receiving; when there is no ranging blind area, the main antenna of the slot array is used The received echo forms and channel, azimuth difference channel and pitch difference channel data, three-channel data for target distance measurement; when there is a ranging blind area, the main antenna of the slot array is used as a transmitter, and the protection antenna receives echo data to form protection channel data ; Protect the antenna to receive real-time distance observation without blind spots, and meet the requirements of meter-level distance measurement; finally, the pulse method is used for distance measurement, combined with pulse compression to improve the accuracy of ranging, so as to meet the requirements of radar ranging accuracy.

Description

technical field [0001] The invention relates to the technical field of radar ranging, in particular to a blind-zone-free ranging method and system for monopulse radar with a protection channel. Background technique [0002] The commonly used ranging methods for radar mainly include pulse ranging and frequency modulation ranging (FMCW). The pulse method calculates the target distance by calculating the time difference between the transmitted pulse and the received pulse. Frequency modulation continuous wave ranging is to measure the distance by using the frequency difference between the echo signal and the transmitted signal, that is, the target distance information contained in the difference frequency, by transmitting an equal-amplitude continuous wave signal whose frequency is modulated. The pulse method has the advantages of high tracking accuracy, long range, and good anti-interference performance; but there is a distance blind zone. The advantage of frequency modulati...

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Problems solved by technology

This method uses frequency-modulated continuous waves, and the working distance is limited; "Radar Ranging and Angle Measurement Method Based on Difference Beam Modulation and Waveform Analysis" (patent application number: 201310585874.3, patent publication number: CN103616679A) discloses a method based on difference beam modulation The radar ranging and angle measuring method based on waveform analysis, in which the monopulse radar transceivers are co-located, the switching of the transmitting and receiving takes time, and the distance measurement without blind spots cannot be realized; "A Measuring Device and Compensation Correction Method for Accurate Correction of FMCW Radar Range Measurement" (Patent application number: 200910092240.8, patent publication number: CN101666874A) discloses a measurement device and compensation correction method for accurate correction of FMCW radar ranging. The method uses the frequency method for distance measurement, and the remote measurement is limited, and the cost of separating the transmitting and receiving antennas is high.

[0004] Through the paper search, two related papers were retrieved, among which "Frequency Modulation Continuous Wave Ranging Method Based on Derivation Ratio" is for continuous wave ranging, and this method also has the disadvantage of short ranging range

"Research on the Distance Obscuration Characteristics of High-Frequency Radar Phase-encoded Signals" is a study on the ranging of monostatic radars that cannot transmit and receive at the same time. Although this method can shorten the short-range measurement range, it cannot achieve blind-free ranging

[0005] The single-pulse radar ranging of the above three patent applications cannot realize ranging without blind spots, while continuous wave ranging can realize ranging without blind spots, but the ranging range is relatively short

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