Design Technique for Improved Bandwidth Moving Target Indicator Processors in Surface Radars
ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING LAB REDSTONE ARSENAL AL
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A technique is presented for assigning the number and values of a set of transversal digital filter weights used with a moving target indicator filter to remove clutter. The approach involves a tradeoff between the amount of clutter rejection and useable bandwidth over which a moving target indicator filter satisfactorily passes a doppler signal i.e., a specified detection probability is met or exceeded. The useable bandwidth is enhanced by an integrator which sums the B outputs from an N-tap, fixed window moving target indicator filter during a beam dwell of NB pulses. The procedure is applicable to any moving target indicator radar which employs a transversal moving target indicator filter and a reasonable number of returnsbeam dwell. The narrow-band clutter example Gaussian power spectrum, sigma 5 Hz indicates an improvement in useable bandwidth from the 62 achievable with 16 outputs from a conventional three-pulse canceller to 80.8 for five outputs from a nine-tap Chebyshev filter, while only reducing the clutter rejection from 92 to 69 dB.
- Active and Passive Radar Detection and Equipment