Monopulse radar non-blind area distance measurement method and system with protection channel

Abstract

The invention discloses a monopulse radar non-blind area distance measurement method and system with a protection channel. The system comprises a slot array main antenna, a protection antenna, a tuner, a circulator, an intermediate-frequency receiver, a signal processor, a secondary power source and a transmitter. The system is a monopulse system; the slot array main antenna periodically transmitshigh-frequency pulse signals, and the protection antenna receives target echo signals in real time; transmitting and receiving are carried out correspondingly, so that transmitting and receiving canbe separate; when no distance measurement blind areas exist, sum channel, azimuth difference channel and pitch difference channel data are formed by echoes received by the slot array main antenna, thesum channel, azimuth difference channel and pitch difference channel data are adopted to perform target distance measurement; when a distance measurement blind area exists, the slot array main antenna is used as a transmitting antenna, and the protection antenna receives echo data, and therefore, protection channel data can be formed; the protection antenna carries out real-time receiving to realize non-blind area distance observation, and meter-scale distance measurement requirements can be met; and finally, distance measurement is performed through a pulse method, and distance measurement precision is improved through pulse compression, so that radar distance measurement precision requirements can be met.

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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