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Speed sensor and head-mounted data display

  • US 4,757,714 A
  • Filed: 04/10/1987
  • Issued: 07/19/1988
  • Est. Priority Date: 09/25/1986
  • Status: Expired due to Term
First Claim
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1. A speedometer for a self-propelled sportsman moving by his or her own force or momentum along a stationary medium comprising means mounted for movement with the sportsman for transmitting waves toward the stationary medium and for detecting such waves reflected from the stationary medium, means mounted for movement with the sportsman for measuring the difference in frequency between the transmitted and reflected waves in accordance with the Doppler effect, means mounted for movement with the sportsman for calculating the speed of the sportsman from such frequency difference, and means mounted for movement with the sportsman for indicating such speed.

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