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Space-based step frequency time-sharing angle measurement radar spatial non-cooperative target imaging method

A technology of non-cooperative target and imaging method, which is applied in the field of space-based stepping frequency-division time-division angle-measuring radar space non-cooperative target imaging, which can solve the problems of narrow antenna beam width and inability to obtain ideal ISAR imaging effect

Active Publication Date: 2012-09-19
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0002] The long-distance detection of space non-cooperative targets requires the antenna to have high gain, so the antenna beam width is generally narrow; at the same time, due to the huge relative motion speed of the spacecraft, the non-cooperative space targets will exceed the beam range during the imaging time and cannot be obtained. Ideal ISAR imaging effect

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  • Space-based step frequency time-sharing angle measurement radar spatial non-cooperative target imaging method
  • Space-based step frequency time-sharing angle measurement radar spatial non-cooperative target imaging method
  • Space-based step frequency time-sharing angle measurement radar spatial non-cooperative target imaging method

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[0051] Specific examples:

[0052] like figure 1 As shown, the radar input index parameters are set as follows: the farthest radar operating distance is 65km, the imaging resolution is required to reach 0.15m×0.15m, the radar transmission frequency is 33.55GHz (RF wavelength 8.9mm), the shortest operating distance is 1.5km, the radar The time width of the transmitting signal is 8us, the target azimuth dimension is 10m, the target moving speed is 100m / s, the pulse sub-band width is 200MHz, the synthesis bandwidth is 1.2GHz, the number of step frequency pulses is M=6, and the Boltzmann constant K=1.38× 10 -23 J / K, standard room temperature T=290K, noise factor F n =5dB, target scattering cross-sectional area σ=10dBsm, radar average transmission power P t =1W, antenna gain G=40dB.

[0053] (1) First, set the radar parameters according to formulas (1) to (5):

[0054] Set the beam switching time T according to formula (1) 1 :

[0055] T 1 ≤2R min / c-τ=2×1500 / (3×10 8 )-...

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Abstract

The invention discloses a space-based step frequency time-sharing angle measurement radar spatial non-cooperative target imaging method. Aiming at the problem of high-resolution imaging of a spatial high-speed non-cooperative target through a space-based step frequency time-sharing and difference angle measurement radar, by reasonable radar parameter design and signal flow design, a target tracking algorithm is embedded in an imaging algorithm, the time-sharing sum / difference narrow beam radar two-dimensional tracking imaging function can be realized by utilizing a set of transmitting signal timing sequence, and the imaging of a space target beyond the range of radar beams in the imaging process is realized.

Description

technical field [0001] The invention relates to a space-based stepping frequency-division time-division angle-measuring radar space non-cooperative target imaging method, which belongs to the field of space-based radar tracking and imaging, and is used for high-resolution tracking and imaging of space non-cooperative targets, and outputs two-dimensional image information of the target . Background technique [0002] The long-distance detection of space non-cooperative targets requires high antenna gain, so the antenna beam width is generally narrow; at the same time, due to the huge relative motion speed of the spacecraft, the space non-cooperative targets will exceed the beam range during the imaging time and cannot be obtained. Ideal ISAR imaging effect. For example, the beam width of space-based radar is 1.3°, such as figure 1 As shown, assuming that the ISAR imaging resolution required by the system is 0.15m, the imaging coherent accumulation rotation angle is 4.2°. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/32
Inventor 宋大伟尚社
Owner XIAN INSTITUE OF SPACE RADIO TECH
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