Discussion
Attitude reference technologies compared.
| Technology | Moving parts | Typical bias | Typical application |
|---|---|---|---|
| Gimballed spinning mass | Many | Moderate | Legacy transport |
| Strapdown ring laser | Dither only | Very low | Navigation grade |
| Strapdown fibre optic | None | Low | Transport and military |
| Micro-electromechanical | None | Higher | Light aircraft and drones |
What trade is the last row making?
Answer: D
Correct answer: Accepting larger bias for size and cost
The micro-electromechanical row trades accuracy for size and cost. Its bias is the largest of the four technologies listed, but the sensors are tiny, inexpensive and made in volume, which is what puts a full attitude and heading reference system within reach of light aircraft and unmanned vehicles.
The trade is not ruggedness - having no moving parts, these devices are the most rugged of the four, not the least. Nor is size given up: they are the smallest. What is given up is bias performance, which is why they are not used where navigation-grade accuracy is required.
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