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Beam rider guidance

M S Prasad

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ANGLE Tracking : guidance use

Trackers using a single time-shared beam to track angles: Sequential lobing Conical ScanSimultaneous beams:

Mono Pulse trackers

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Sequential Lobing

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An alternative to stepping the antenna beam around the direction of the

target is to rotate it continuously .Because the rotation of the squinted beam and the targets offset from the

rotation axis, the amplitude of the echo signal modulated at beam rotation

frequency

Amplitude of the modulation depends on the angular distance betweentarget direction and rotation axis.

Conical Scanning

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Phase of modulation gives the angle error

Amplitude gives the beam displacement

Problem areas :

1. change of Echo amplitude from Pulse to pulseDue to RCS variation of target.

2. They can process at the most 10 -15

Pulses per second.

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Conical Scanning

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MONO Pulse technique

The problem of pulse to pulse variation of Echo can be solved by having

Simultaneously more than One beam (4 ) on the target to measure .

Simplest system : Amplitude comparison : SUM & DIFF

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PHASE COMPARISON MONOPULSE SYSTEM

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Hardware based processing

Software based processing