AESA Radar Terrain Profiling and Altimetry via Dynamic Beam Steering
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Solution Overview
Problem
Conventional altimeters provide only a single point of information, the height of an aircraft relative to the terrain directly below, limiting situational awareness in complex airborne missions.
Innovation Solution
An aircraft-based radar system utilizing a single active electronically scanned array (AESA) antenna array for both terrain profiling and altimetry, capable of steering electronically or mechanically to desired directions, including a downward direction for altimetry scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single conventional altimeter is used, then the device complexity is low, but the situational awareness and information quantity are limited
Solution Approach 1:
The patent applies multi-functionality by enabling a single radar system to perform both terrain profiling and altimetry measurements. The AESA radar is configured to scan in multiple directions including downward for altimetry and forward for terrain profiling, allowing one device to provide both altitude information and terrain profile data, thereby reducing information loss without proportionally increasing device complexity
Solution Approach 2:
The patent transitions from a single-point measurement (conventional altimeter) to a multi-dimensional measurement system. By enabling the radar to scan in multiple directions (azimuth and elevation angles) and provide both range and Doppler velocity information, the system adds dimensional complexity to the measurements, enabling comprehensive situational awareness including altitude, terrain profile, and target velocity information
2Device complexity
If a single AESA radar is used for both terrain profiling and altimetry, then the device complexity is reduced, but the measurement precision for each function may be compromised
Solution Approach 1:
The patent applies segmentation by dividing the AESA radar functionality into distinct operational modes: a first subset of antenna elements dedicated to terrain profiling with forward-looking beams, and a second subset dedicated to altimetry with downward-looking beams. This segmentation allows each subset to be optimized for its specific function while maintaining overall system simplicity
Solution Approach 2:
The patent employs dynamic beam steering capability of the AESA to switch between different scanning patterns and directions based on operational requirements. The system can dynamically reconfigure which antenna elements are active and in what directions they scan, allowing precise control over measurement quality for each function without requiring separate fixed systems
3Loss of information
If the AESA scans in multiple directions including downward, then the situational awareness is improved, but the time required for scanning increases
Solution Approach 1:
The patent implements periodic scanning actions with distinct scan patterns: a first scan pattern for terrain profiling and a second scan pattern for altimetry. The system periodically switches between these patterns based on operational needs, allowing efficient collection of both terrain and altitude information through repeated cyclic scanning rather than continuous scanning
Solution Approach 2:
The system performs preliminary identification of ground targets during terrain profiling scans before altimetry measurements are taken. By pre-processing the terrain profile data and identifying target locations and characteristics in advance, the system can optimize subsequent altimetry scanning to focus only on relevant areas, reducing overall scanning time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system generates detailed terrain profile data and provides precise aircraft altitude estimates, enhancing situational awareness and operational capabilities in complex airborne environments.
Implementation Method 1
an active electronically scanned array (AESA), e.g., a linear or two-dimensional array of antenna elements for emitting RF energy in a desired direction and receiving RF energy reflected by, and indicative of, ground-based targets
Implementation Method 2
receiving RF energy reflected by, and indicative of, ground-based targets
Implementation Method 3
an inertial sensor (e.g., inertial measurement unit (IMU)) for determining the current orientation (e.g., three-axis angular orientation) of the AESA
Implementation Method 4
a signal processor for determining, based on the received reflected RF energy, a range and Doppler velocity from the AESA to each of a set of detected ground targets
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
An aircraft-based system for providing forward-looking terrain profiling and downward-looking altimetry via a single active electronically scanned array (AESA) (104) orients the AESA through a sequence of desired directions, e.g., according to a predetermined scan pattern. At each desired direction, the AESA scans for ground-based targets, determining a range and Doppler velocity to each detected target. The AESA additionally orients downward, e.g., during a dedicated altimetry frame and with the assistance of inertial sensors to determine the orientation of the AESA, to scan terrain directly below the aircraft and provide a precise estimate of the altitude of the aircraft. Based on the determined ranges and velocities, the radar system determines a pointing angle and vertical/horizontal distances between the aircraft and each identified ground-based target.