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This reduces the shadow zone, but causes errors in distance and height measuring. In practice, to find D h {\displaystyle D_{h}} , one must be using a value of 8.5·10 3 km for the effective Earth's radius R e {\displaystyle R_{e}} (4/3 of it), instead of the real one.
Gyro gunsights developed for aircraft of the Second World War displayed a reticle that compensated for target lead. Modern fighter aircraft have automated deflection sights, where a computer calculates lead and projects the solution onto a head-up display (HUD). The visual assistance with targeting the gun is offset by the speed and agility of ...
The resolution of any radar depends on the width of the beam and the range to the target. For example; a radar with 1 degree beam width and a target at 120 km (75 mi) range will show the target as 2 km (1.2 mi) wide. To produce a 1-degree beam at the most common frequencies, an antenna 1.5 kilometres (0.93 miles) wide is required.
A beam reach is when the true wind is at a right angle to the direction of motion (so called because the wind is parallel to the cross-hull beams, if any; see beam). A broad reach is when the wind is coming from behind the sailing craft at an angle. This represents a range of wind angles, between a beam reach and running downwind (see next ...
Range ambiguity occurs when the time taken for an echo to return from a target is greater than the pulse repetition period (T); if the interval between transmitted pulses is 1000 microseconds, and the return-time of a pulse from a distant target is 1200 microseconds, the apparent distance of the target is only 200 microseconds.
The longest-range ATACMS variant has a farther reach than much of Ukraine's arsenal, including the British air-launched Storm Shadow cruise missile, which can strike targets about 155 miles away ...
The law currently requires wind turbines to be a distance at least equal to the height of the structure away from property lines. However bills 28, 29 and 30 all look to increase that amount ...
In the vertical plane (elevation), which is governed by the distance (range) to the target and the energy of the propelling charge. The projectile trajectory is affected by atmospheric conditions, the velocity of the projectile, the difference in altitude between the firer and the target, and other factors. Direct fire sights may include ...