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Target and clutter distance deambiguation method and system based on waveform agility space-based radar

A radar target and deblurring technology, applied in the radar field, can solve the problems affecting radar target detection performance, affecting the efficiency of radar scanning, and distance deblurring, etc., and achieves the effects of strong practicability, reduced strength, and improved suppression performance.

Active Publication Date: 2022-04-12
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0004] For space-based radars, multiple frequency groups are used for range defuzzification. When the target velocity range is large or the satellite orbit is high, a large number of frequency groups need to be designed for a beam dwell, which will affect the efficiency of the radar's large-scale search and scan.
As for the clutter range ambiguity, the deblurring process using the elevation beamforming method requires a large elevation-dimensional antenna size (above tens of meters), which is difficult to realize in engineering. At this time, the increase of the input clutter intensity will greatly Affects radar target detection performance

Method used

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  • Target and clutter distance deambiguation method and system based on waveform agility space-based radar
  • Target and clutter distance deambiguation method and system based on waveform agility space-based radar
  • Target and clutter distance deambiguation method and system based on waveform agility space-based radar

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Embodiment Construction

[0042] Based on waveform agility space-based radar target and clutter range defuzzification method, such as figure 1 .

[0043] Step 1 Calculate the shortest distance Rmin and the furthest distance Rmax of the radar beam coverage area according to the orbital height H, the earth radius R, the radar pitch beam width θ, and the radar beam center down angle of view α:

[0044]

[0045]

[0046] Step 2 assumes that the radar system intends to use the pulse repetition frequency as PRF, and calculates the number of main lobe ambiguities N. It is easy to know that N is greater than The smallest integer of , at this time there are N ambiguous areas in the radar range. .

[0047] Step 3 The radar transmits N radar signals S with the same bandwidth and orthogonal waveforms i (t), i=1,2,...,N,

[0048] where ∫S i (t) * S j (t) * dt=0, i≠j.

[0049] Step 4. Assuming that the radar transmits M pulses in one coherent accumulation time, and receives M echo data, the following m...

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Abstract

A space-based radar object and clutter range defuzzification method and system based on waveform agility belongs to the field of radar technology. Aiming at the problems of range clutter ambiguity and target ranging ambiguity in high-speed target detection, the present invention proposes a waveform-agile space-based radar target and clutter range defuzzification method. The radar transmits pulse-to-pulse orthogonal waveform signals and utilizes The transmitted orthogonal waveforms are successively matched and filtered according to a specific order to realize the separation of radar echoes in different ambiguity areas, and complete the distance deambiguation of the target while effectively improving the signal-to-clutter ratio.

Description

technical field [0001] The invention relates to a space-based radar target and clutter range defuzzification method and system based on waveform agility, and belongs to the field of radar technology. Background technique [0002] At present, there is no space-based early warning radar in orbit. The related information of space-based early warning radar in public literature mainly focuses on the research on the concept and system of space-based early warning radar, clutter analysis and suppression, etc. There is no space-based radar target yet. A dedicated study and report on distance deblurring of clutter and clutter. [0003] For the current airborne / ground-based radars, the current target range defuzzification method mainly adopts the multi-frequency group design, the radar transmits multiple pulse trains with different repetition frequencies, and uses the "coincidence method" or "Chinese remainder theorem" method for distance resolution. Vague. For clutter ambiguity, th...

Claims

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Application Information

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IPC IPC(8): G01S7/292G01S7/28G01S13/08
CPCG01S7/2927G01S7/2928G01S7/2813G01S13/08
Inventor 王伟伟杨晓超朱江段崇棣李渝黎薇萍范一飞李奇
Owner XIAN INSTITUE OF SPACE RADIO TECH
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