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Radar System

Monopulse Tracking Radar

MONOPULSE TRACKING RADAR SUM (Σ) AND DIFFERENCE (Δ) CHANNELS FOR ANGLE TRACKING HORNAHORNBHORNCHORND HYBRIDCOMPARATOR Magic Tee Network ΣΔAZΔEL LNAΣLNAΔAZLNAΔEL MIXΣMIXΔAZMIXΔEL IFΣIFΔAZIFΔEL ΔAZ / ΣAZ Error ΔEL / ΣEL Error SERVOAntenna Drive LO
Component Descriptions

Signal Chain Walkthrough

Monopulse tracking radar determines the precise angular position of a target in a single pulse, using simultaneous sum and difference channel processing. This is the standard architecture for precision tracking radars (missile guidance, satellite tracking, fire control).

Four-Horn Feed

Four antenna feed horns (A, B, C, D) are positioned at the focal point of a parabolic reflector. Each horn receives a slightly different portion of the incoming wavefront from the target.

Hybrid Comparator

A network of magic tees or hybrid couplers forms three outputs: Σ (sum of all four horns, for range/detection), ΔAZ (azimuth difference, left-right error), and ΔEL (elevation difference, up-down error).

Error Signal Generation

The ratio Δ/Σ produces a normalized angle error signal proportional to the target's offset from boresight. This works with a single pulse, unlike conical scan which requires multiple pulses. The error signal drives the antenna servo to track the target.

Typical Specifications

Component Specifications

ComponentParameterTypical Value
HornsConfiguration4 (2×2 cluster)
Track AccuracyAngular0.01 - 0.1 beamwidth
ChannelsCount3 (Σ, ΔAZ, ΔEL)
Cross-eye jammingRejectionLimited (architecture weakness)
Design Note: Monopulse achieves single-pulse angle measurement because it processes simultaneous signals from multiple feeds. The Δ/Σ ratio normalizes out amplitude fluctuations (glint, multipath), making the angle estimate robust. The main vulnerability is cross-eye jamming, where two coherent jammers create a false phase center between them.
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