A Target Location Method Based on Primary Frequency Offset for Frequency Diversity Array Radar
A technology of frequency diversity array and target positioning, which is applied in the direction of radio wave reflection/reradiation, instruments, measuring devices, etc., can solve the problems of increasing system complexity, increasing the difficulty of achieving phase synchronization, and increasing the complexity of signal processing, etc.
Active Publication Date: 2020-09-11
GUILIN UNIV OF ELECTRONIC TECH
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[0004] The above two methods are currently the main research methods to solve the target range and angle coupling problem of frequency diversity array radar, and their essence is to solve the range and angle coupling problem by transmitting different frequency offsets. However, from the perspective of frequency diversity array radar system, Changing the frequency offset multiple times will increase the complexity of the system, increase the difficulty of phase synchronization, and also increase the complexity of signal processing
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[0060] A frequency diversity array radar based on a frequency offset method for target location, its specific implementation steps are as follows:
[0061] 1) The transmission mode of the frequency diversity array radar transmission system is adopted, such as figure 1 As shown, assume that the number of transmitting array elements is N, and the transmitting frequency of each array element is f 0 The in-phase and phase-continuous pulse signal, and then linearly increase a small frequency offset Δf and phase-synchronized signal on different array elements to be the final transmit signal of each array element, as follows:
[0062] Frequency diversity array radar array element transmitting system, the initial phase of each array element transmit signal is 0, and the nth array element transmit signal is s tn (t):
[0063] the s tn (t)=exp{j2π(f 0 +nΔf)t} (1)
[0064] In formula (1), t∈[0,τ], τ is the pulse width, n∈[0,N-1], N is the number of array elements, f 0 is the array ...
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The invention discloses a primary-frequency-offset-based target positioning method of a frequency diversity array radar. N array-element transmitting terminals of a frequency diversity array radar employ a way of transmitting phase-continuous pulse signals. At a radar signal receiving terminal, each receiving array element demodulates an echo signal to a baseband and connection to a broadband filter is carried out; signals at different frequencies are received; a narrow-band filter carries out screening combination on N signals that are received by each array element and have different frequencies; and after recombination of signals screened by different array elements echo signal processing is carried out to obtain distance and direction angle information of a target. With the method disclosed by the invention, the complexity of the single-target positioning system of the frequency diversity array radar system is reduced; multi-times frequency offsets are easy to realize by a primary-frequency-offset phase synchronization system, so that the signal processing complexity of the multi-frequency-offset radar system is avoided. Two kinds of signals with different frequencies are selected from echo signals that have different frequencies and are received by each receiving array element at the radar system receiving terminal to carry out combination, so that single-target positioning is easy to realize.
Description
technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a target positioning method for a frequency diversity array radar based on a primary frequency offset. Background technique [0002] The concept of frequency diversity array radar was proposed by Antonik of the US Air Force Research Laboratory in 2006, and has been extensively studied subsequently. The difference between the frequency diversity array and the phased array is that the frequency diversity array linearly increases a small frequency offset on the transmission signals of different array elements to form a transmission pattern with distance-angle dependence, so that the beam can be automatically in the The airspace is scanned periodically, and the distance dependence can also suppress interference. However, the characteristics of beam distance and angle coupling in the frequency diversity array make it impossible to obtain the target distance informatio...
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IPC IPC(8): G01S13/46
CPCG01S13/46
Inventor 欧阳缮黄高见谢跃雷
Owner GUILIN UNIV OF ELECTRONIC TECH