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Over-the-horizon HF radars use the ionosphere as a kind of mirror to "see" around the curvature of the earth. They have a variety of uses, both military and civilian. And they have the advantage over line-of-sight microwave radars of being able to cover enormous areas with much less power and at a fraction of the cost of the latter.
Baird hooked them in. The universe outside the ship again appeared filled with brilliantly colored dots of light which were stars. More satisfying, the globe-scanners again reported no new objects anywhere. Nothing new within a quarter million miles. A half-million. Later Baird reported: "Radars report no strange objects within a million miles of the Niccola, sir."
Higher headquarters had decided against establishing a net of manned tracking stations, astronomical cameras tied in with radars, and our other proposed instrumentation. General Garland had argued long and hard for the plan, but he'd lost. It was decided that the cameras with diffraction gratings over the lenses, the cameras that had been under development for a year, would suffice.
Then Admiral Fahrney read a statement regarding the policies of NICAP. It was as follows: "Reliable reports indicate that there are objects coming into our atmosphere at very high speeds . . . No agency in this country or Russia is able to duplicate at this time the speeds and accelerations which radars and observers indicate these flying objects are able to achieve.
Bors ordered that for intervals of up to five minutes no electronic apparatus on the ship should be in operation. In those periods of electronic silence, his radars swept all of space except Mekin. He had no desire to have Mekin pick up radar-pulses and wonder what they came from. The rest of the system, though, he mapped.
If there's a way to get a directional fix on you, they'll find it! So, make it short!" On Thursday morning all broadcasts broke off to report that the DEW line of radars across Canada had reported objects in the air moving across the North Pole toward the United States.
The senior controller then called the control tower at National Airport; they reported that they also had unidentified targets on their scopes, so did Andrews. And both of the other radars reported the same slow speeds followed by a sudden burst of speed. One target was clocked at 7,000 miles an hour.
Jets ranged widely, looking for something that would offer battle, but the radars said that the metal ship had gone up to three hundred miles and then headed west and out of radar range.
"It was an interesting job," said Vale. "The Army dumped a hundred tons of high explosive into the lake. The two radars that reported a ship in space were arranged to be operated by two special men, who got their orders directly from the President.
Radar systems are used for early warning, air defense, air asset management, air traffic control, naval fleet defense, detection and tracking of moving ground targets, missile targeting, missile terminal guidance, terrain data development, and weather prediction. For Rapid Dominance, radars and other active sensors must operate with low probability of intercept.
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