Time Modulation Array Direction Finding System Based on Pulse Compression Technology
A technology of pulse compression and time modulation, which is applied to direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve the problems of complex calculation, complex hardware structure, and high cost, and achieve low complexity and low cost. Cost, effect of high-precision direction finding
Active Publication Date: 2020-07-14
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
[0002] Direction finding technology is widely used in the fields of radar, sonar, and wireless communication. Traditional direction finding methods have problems such as complex hardware structure, high cost, complex calculation, or low estimation accuracy.
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Embodiment 1
[0067] Suppose the carrier frequency of the transmitted chirp signal is f 0 =2GHz, the bandwidth is B=10MHz, the duration T=100μs, and the frequency modulation slope is μ=B / T=10 11 . The azimuth angle of the normal phase direction of the target relative to the array is θ=15°, and the distance between the antenna array elements is d=λ / 2=15cm, λ=c / f 0 is the wavelength of the incident signal, and c is the speed of electromagnetic waves propagating in vacuum. The time-frequency relationship diagram of the transmitted signal is as follows figure 2 As shown in , the signal has an ideal linear relationship in the time-frequency domain.
[0068] After the signal transmission is complete, the array switches to the receiving state. When receiving, each radio frequency switch is opened sequentially within the unit period for time modulation, and the modulation period is T p = 1μs, modulation frequency f p =1MHz, in one modulation period, the on-time of each antenna element is 0.1...
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The invention provides a time modulation array direction finding system based on pulse compression technology, which comprises an antenna array module (1), a radio frequency switch module (2), a digital control module (14), a duplexer (3), a radio frequency local oscillation module (8), a signal transmitting module and a signal receiving module; the antenna array module (1) is sequentially connected with the radio frequency switch module (2) and the duplexer (3), the duplexer (3) is respectively connected with the signal transmitting module, the signal receiving module and the digital controlmodule (14) and is respectively connected with the radio frequency switch module (2) and the duplexer (3), and the radio frequency local oscillation module (8) is respectively connected with the signal transmitting module and the signal receiving module. The system has the advantages of low cost, simple structure and high direction-finding accuracy, and is suitable for platforms such as miniaturized guidance radar, automobile anti-collision radar, unmanned automobile detection system and the like.
Description
technical field [0001] The invention relates to the technical field of antenna engineering, in particular to a time modulation array direction finding system based on pulse compression technology. Background technique [0002] Direction finding technology is widely used in the fields of radar, sonar, and wireless communication. Traditional direction finding methods have problems such as complex hardware structure, high cost, complex calculation, or low estimation accuracy. As a new low-cost and low-complexity antenna, time-modulated array has attracted great attention in recent years. The array generates harmonic components with different amounts of information through periodic modulation, which can be used to realize functions such as direction finding, beam scanning, and space division multiple access. As a spread spectrum signal with a large time-width bandwidth product, FM signal is also used in communication, radar, sonar detection and synthetic aperture radar imaging ...
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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 陈靖峰贺冲金荣洪朱卫仁梁仙灵耿军平曹岸杰
Owner SHANGHAI JIAO TONG UNIV