Signal emission system based on time modulation array and target positioning method
A technology of time modulation and signal transmission, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as huge amount of calculation, and achieve the effect of saving computing resources
Pending Publication Date: 2022-04-12
HENAN POLYTECHNIC UNIV
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[0004] The technical problem to be solved by the present invention is that the existing target DoA estimation methods all require a huge amount of calculation, and a signal transmission system and target positioning method based on time modulation array are provided
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[0035] The present invention will be further described below in conjunction with the accompanying drawings.
[0036] Co-located radar system based on time-modulated array transceivers, such as figure 1 As shown, the transmitting system and the receiving system adopt the co-location of transmitting and receiving, and the transmitting end is only in the space direction θ 0 Synthetic phase-shift keying modulation PSK symbols, when the space target exists, the receiving end receives the target echo signal, demodulates and calculates the BER, the space angle corresponding to the BER main lobe is the target azimuth angle; and the target distance information is estimated by using Transmitting a ToA measurement method of a known sequence of synthesized symbols.
[0037] Signal transmission systems based on time-modulated arrays, such as figure 2 As shown, it consists of N array elements arranged linearly at equal intervals, where N is a positive integer. The interval between array...
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The invention discloses a signal transmitting system based on a time modulation array and a target positioning method, and the system employs a time modulation array signal transmitting system, fully utilizes the parameters of an RF switch function to design the degree of freedom, designs the time sequence of the RF switch function, and enables the RF switch function to synthesize a PSK symbol at a specific frequency and in a specific direction, and to form a beam gain. When a receiving end and a transmitting end adopt a deployment mode of simultaneous receiving and transmitting, azimuth angle information of the targets can be determined by a target echo BER main lobe, and distance information is obtained according to a ToA method for transmitting a known symbol sequence, so that azimuth angle estimation can be performed on a plurality of targets at the same time, and the problem of huge calculation amount caused by traditional target estimation algorithms such as MUSIC and BP is solved.
Description
technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a signal transmitting system and a target positioning method based on a time modulation array. Background technique [0002] Radar target positioning technology has a wide range of application requirements in both military and civilian fields. Traditional radar target azimuth-distance estimation mostly adopts multiple signal classification (Multiple Signal Classification, MUSIC) algorithm, or back-projection (Back-projection, BP) algorithm. However, whether it is MUSIC or BP or other Direction of Arrival (DoA) estimation algorithms, the global search of the space will bring a huge amount of calculation. [0003] Time modulation array is a technology that introduces the radio frequency (RF) switch function into the array antenna design. By controlling the "connection" and "disconnection" time of the RF switch, the excitation time of different antenna e...
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IPC IPC(8): G01S7/28G01S13/88
Inventor 黄高见李兴旺李俊霞李赓张延良郭辉
Owner HENAN POLYTECHNIC UNIV