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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 4107676 | Trans-horizon navigation system A trans-horizon navigation system wherein a predetermined sequence of control pulses is phase-encoded onto an RF carrier for transmission from a first transceiver to a second transceiver, the second transceiver including a correlator which provides an out... | 08/15/1978 |
| 4104629 | Marine radar interrogator-transponder target detection, identification, and range measurement system A marine radar interrogator-transponder navigation and collision avoidance system provides facilities for early detection of, identification of, and communication with cooperating marine vessels. For these purposes, a general coded call may be transmitted... | 08/01/1978 |
| 4083047 | Vehicle guidance system A vehicle guidance system is disclosed that is suitable for guiding a vehicle or person along a straight line navigational aspect with signaling and processing typical of hyperbolic navigational systems, for example, in certain farming operations where th... | 04/04/1978 |
| 4047171 | Transponder A radar transponder which transmits a frequency coherent coded reply for each interrogation pulse it receives within a broad frequency. The transponder comprises means for receiving an incoming signal pulse; means for converting the incoming pulse into a ... | 09/06/1977 |
| 4031535 | Multiple frequency navigation radar system A navigation system in which a transmitter-antenna combination radiates two independent signals with a known frequency separation there between. These signals are radiated to an antenna on a navigation marker whereby they are received and directed to a no... | 06/21/1977 |
| 4011562 | Single frequency radio ranging system A precision radio ranging system that uses primarily a single carrier frequency interrogating and responding signal that is pulse amplitude modulated to provide phase shift information. A mobile interrogator finds its position by measuring ranges to each ... | 03/08/1977 |
| 3943509 | Navigation aiding systems with one-way ranging and two-way synchronization A navigation aiding system primarily for aircraft consists of a number of spaced apart ground stations. A ranging signal is transmitted to each of a number of aircraft in turn in response to received interrogation signals. The system allows a clock carrie... | 03/09/1976 |
| 3938146 | Secure encoder for trilateralization locator utilizing very narrow acceptance periods A system for radar station identification depends primarily upon the encoding growing out of a pulse repetition rate of interrogation pulses. To secure the encoding, one or more pulses arm the system and succeeding pulses must be detected during an extrem... | 02/10/1976 |
