How Launch Monitors Work: Camera vs Radar vs Overhead
How do launch monitors work? Every golf launch monitor uses one of three technologies: Doppler radar, photometric cameras, or overhead optical systems. Radar units bounce radio waves off the ball in flight and measure the Doppler shift to calculate speed, trajectory, and spin — they track real ball flight but need 16+ feet of room depth. Camera units photograph the ball at impact with high-speed cameras, measuring spin directly from the ball rotation — they work in rooms as short as 10 feet but need consistent lighting. Overhead systems mount cameras on the ceiling and track the hitting zone from above, offering the best club data and the cleanest floor layout, but they start at $3,825 and require 9.5-foot ceilings. The right choice is determined by one thing: your room dimensions.
Every launch monitor on the market uses one of three technologies to figure out where your ball went and how it got there. The marketing copy for each will tell you they are the best. The YouTubers will tell you about accuracy percentages. The forums will argue about which brand is better.
None of that matters until you measure your room.
The three technologies — radar, camera, and overhead — are fundamentally different approaches to the same problem. They do not just measure things differently. They measure different things. And the one you pick will shape everything about your simulator experience: how much room you need, how accurate your spin numbers are, whether you can use it outdoors, what your setup looks like, and how much it costs.
Here is what each technology actually does, how it works from first principles, where it falls short, and which one belongs in your room.
The Three Ways to Measure a Golf Shot
1. Radar (Doppler) — The Traffic Cop
Radar launch monitors use the Doppler effect — the same physics that makes a police radar gun work. The unit emits a radio wave toward the ball, the wave bounces off the moving ball, and the change in frequency between the emitted and returning wave tells the system how fast the ball is moving and in what direction.
The TrackMan 4, which is the gold standard here, uses dual radar. One beam tracks the clubhead — the metal face reflects the signal strongly — and the other tracks the ball through the full flight. The system captures the ball velocity, trajectory, and spin characteristics from launch to landing.
The critical advantage: Radar measures the entire flight. Every yard of carry distance, every foot of apex height, every degree of landing angle — all directly measured.
The critical weakness: Radar needs the ball to fly. The indoor problem is obvious: you hit into a screen 10 feet away, and the radar gets a fraction of a second of flight data. From that tiny sample, it has to extrapolate the remaining 200 yards of trajectory. The algorithms are good — they have gotten much better in the last few years — but it is still extrapolation, not measurement.
Room requirements: Radar units need 16-18 feet of total room depth minimum. The breakdown is roughly 6-8 feet behind the ball for the unit, 8-10 feet of ball flight before the screen. Ceiling height minimum is 9 feet, with 10+ feet preferred. See our depth requirements guide and ceiling height guide.
Popular radar models: Garmin R10 ($499), Rapsodo MLM2Pro ($699), FlightScope Mevo+ ($1,995), TrackMan 4 ($24,995).
2. Camera (Photometric) — The High-Speed Photographer
Camera-based launch monitors use high-speed cameras to photograph the ball at the moment of impact. The SkyTrak+ fires infrared strobes at 10,000 frames per second. The Foresight GC3 uses three cameras at 3,000 fps each. The Square Golf Omni uses four cameras covering the hitting area from multiple angles.
The camera identifies the ball markings — Titleist dimple pattern, Callaway hex pattern, or RCT reflective dots — and tracks how those markings rotate between frames. That rotation is spin. This is the key difference between camera and radar: a camera measures spin directly, while radar estimates it.
The critical advantage: Camera systems measure spin directly. They see the ball rotating. They do not estimate or calculate. For indoor use, camera systems are the most reliable source of spin data.
The critical weakness: Camera systems need light. The strobes handle this, but a camera system can get confused if you are hitting in a room with weird shadows or direct sunlight coming through a window. They also need to see the ball — if you use blank range balls with no markings, a camera-based system cannot measure spin.
Room requirements: Camera systems need only 8-10 feet of ball flight. They work in rooms as short as 10 feet total depth. Ceiling height does not matter. See our best camera launch monitors guide for the full lineup.
Popular camera models: Square Golf HE ($699), Square Golf Omni ($1,599), SkyTrak+ ($1,995), Bushnell Launch Pro ($2,499), Foresight GC3 ($5,999).
3. Overhead Optical — The Celestial View
Overhead optical systems mount cameras on the ceiling. The Uneekor Eye XO uses two cameras mounted 8-10 feet above the hitting area. The TrackMan iO uses a ceiling-mounted radar array. The [ProTee VX uses a single wide-angle camera.
The critical advantage: No floor obstruction. The hitting area is completely clear. You can place the ball anywhere. The overhead view captures club data — club path, face angle, attack angle, and club delivery — from the perspective that matters most.
The critical weakness: Ceiling height requirements. Most overhead units need 8.5 to 9.5 feet of ceiling clearance. If your ceiling is under 8.5 feet, you cannot use an overhead LM. See our overhead launch monitor guide.
Popular overhead models: Uneekor Eye XO ($5,999), Uneekor Eye XO2 ($8,999), Uneekor Eye Mini ($2,999), ProTee VX ($3,825), TrackMan iO ($14,995).
Which Technology Is Right for You?
The answer is determined by one measurement: your room depth.
| Room Depth | Recommended Technology | Examples |
|---|---|---|
| Under 10 ft | Overhead only | Eye XO, ProTee VX, VTrack |
| 10-14 ft | Camera-based floor units | SkyTrak+, GC3, Square Omni |
| 14-18 ft | Camera or radar | Both work well |
| 18+ ft | Any technology | Any launch monitor works |
For a complete compatibility matrix, see our room depth launch monitor compatibility guide. For a budget-focused decision, see our best budget launch monitors guide. For the definitive ranking of every launch monitor on the market, see our best launch monitors 2026 guide.
For a more concise version of this guide, see our camera vs radar vs optical overview. For more launch monitor analysis, check out our budget LM market shakeout and Rapsodo CLM Pro coverage.