323:. If the target knows the general operating parameters of the radar, it is possible to send out a false signal timed to grow and fade in the same pattern as the radar lobe, but inverted in strength. That is, the false signal is at its strongest when the radar signal is the weakest (the lobe is on the "far side" of the antenna compared to the aircraft), and weakest when the signal is the strongest (pointed at the aircraft). When added together with the "real" signal at the radar receiver, the resulting signal is "always strong", so the control system cannot make an accurate estimate as to where in the lobe pattern the target is located.
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it is necessary to have a control system that keeps the antenna beam pointing at the target as it moves. The radar receiver will get maximum returned signal strength when the target is in the beam center. If the beam is pointed directly at the target, when the target moves it will move out of the beam center and the received signal strength will drop. Circuitry designed to monitor any decrease in received signal strength can be used to control a servo motor that steers the antenna to follow the target motion. There are three difficulties with this method:
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194:, and then rotating it. Given an example antenna that generates a beam of 2 degrees width – fairly typical – a conical scanning radar might move the beam 1.5 degrees to one side of the centerline by offsetting the feed slightly. The resulting pattern, at any one instant in time, covers the midline of the antenna for about 0.5 degrees, and 1.5 degrees to the side. By spinning the feed horn with a motor, the pattern becomes a cone centered on the midline, extending 3 degrees across.
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Additionally, the portion covering the centerline is near the edge of the radar lobe, where sensitivity is falling off rapidly. An aircraft centered in the beam is in the area where even small motions will result in a noticeable change in return, growing much stronger along the direction the radar needs to move. The antenna control system is arranged to move the antenna in azimuth and elevation such that a constant return is obtained from the aircraft being tracked.
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In order to monitor the direction of a designated target, it is only necessary to keep the antenna pointed directly at the target. Knowledge of the pointing direction of the antenna then gives knowledge of the target direction. In order to have the radar system follow a moving target automatically,
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to the antenna, and dramatically change the amount of signal being returned. In these cases, a conical scan radar might interpret this change in strength as a change in position. For instance, if the aircraft were to suddenly "brighten" when it was off-axis to the left, the circuitry might interpret
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Antenna waveguide in COSRO systems includes an RF received feedhorn structure that produces a left/right RF receive sample and an up/down RF receive sample. These two signals are multiplexed inside a waveguide device that has a rotating vane. The output of the multiplex device is a single RF signal
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Actually accomplishing this in hardware is not as difficult as it may sound. If one knows that the signal is rotated at 25 RPM, as it was in the Würzburg radar, the jammer is built to fade from maximum to zero at the same speed, 25 times a minute. Then all that is needed is to sync the signals up,
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RF receive signals from multiple transmit pulses are combined mathematically to create a vertical and horizontal signal. The vertical signal is created by adding RF samples when the vane/feedhorn is in the up direction and subtracting RF samples when the vane/feedhorn is in the down direction. The
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In the U.S. Navy Mk. 25 gun fire control radar, spiral scan mode aided target acquisition. Basically conical scan (of the non-revolving nutating feed type), the size of the scan cone cyclically increased and decreased roughly twice a second. The scanned area was several degrees, in all. (Once the
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The primary difference between the two basic schemes is in polarization. As the feed horn in the rotated process spins, the polarization changes with the rotation and will thus be 90 degrees off in polarization when the feed is 90 degrees off its initial axis. As the feed horn is fixed in nutated
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feed. A nutated feed offsets the antenna at an angle to a fixed feed horn, and then rotates the antenna. A variation of a nutated feed makes the feed move in a small circle, rapidly and continuously changing the pointing direction of the beam. In this latter type, neither the feed nor the antenna
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Whilst use of the main lobe alone might allow an operator to "hunt" for the strongest return and thus aim the antenna within a degree or so in that "maximum return" area at the center of the lobe, with conical scanning much smaller movements can be detected, and accuracies under 0.1 degree are
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The key concept is that a target located at the midline point will generate a constant return no matter where the lobe is currently pointed, whereas if it is to one side it will generate a strong return when the lobe is pointed in that general direction and a weak one when pointing away.
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feed. As its name suggests, a feed horn is set just off the parabolic focal point which causes the energy to focus slightly off the antenna midline. The feed is then rotated around the focal point of the paraboloid to produce the conical rotation. The other system is a
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Automatic guidance for the antenna, and thus any slaved guns or weapons, can be added to a conical scan radar without too much trouble. The control system has to steer the antenna such that a constant amplitude return is received from the target.
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radars). Although this denied lobing frequency information to the jammer in the aircraft, it was still possible to simply send out random spikes and thereby confuse the tracking system (or operator). This technique, called
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Since the lobe is being rotated around the midline of the antenna, conical scanning is only really appropriate for antennas with a circular cross section. This was the case for the Würzburg, which operated in the
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It is possible to arrange a radar so the lobes are not being moved in the broadcaster, only the receiver. To do this, one adds a second antenna with the rotating lobe for reception only, a system known as
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feeds, no polarization changes occur. Most early systems used a rotated feed, due to its mechanical simplicity, but later systems often used nutated feeds in order to use the polarization information.
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this as being off to the right if the change occurs when the lobe is aligned in that direction. This problem can be solved by using two simultaneous overlapping receiver beams leading to the
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Unfortunately there are a number of factors that can dramatically change the reflected signal. For instance, changes in the target aircraft's direction can present different portions of the
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arranged in front of a passive reflector. To arrange conical scanning on such a system would require all of the dipoles to be moved, an impractical solution. For this reason the
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horizontal signal is created by adding RF samples when the vane/feedhorn is in the left direction and subtracting RF samples when the vane/feedhorn is in the right direction.
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As the target moves away from the beam centre, the received power changes only very slowly at first. Thus the system is rather insensitive to antenna pointing errors.
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which is accomplished by looking for the low point in the signal (which is generally easier to find) and triggering the pattern at that point. This system, known as
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The radar will have no information as to which direction the target has moved, and therefore no indication as to which direction to move the antenna to follow it.
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concept used on some of the earliest radars, and many examples of lobe switching sets were modified in the field to conical scanning during
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Conical scanning concept. The radar beam is rotated in a small circle around the "boresight" axis, which is pointed at the target.
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A typical radar antenna commonly has a beam width of a few degrees. While this is adequate for locating the target in an
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Conical scanning addresses this problem by moving the radar beam slightly off center from the antenna's midline, or
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revolves around the pointing axis of the antenna; only the pointing direction changes, tracing out a narrow cone.
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There are two ways to cause the redirection of the beam from the antenna's midline. The first is referred to as a
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The COSRO technique does not transmit any signals that indicate the position of the rotating vane.
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This produces a pair of angle error signals used to drive antenna positioning drive motors.
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antennas of truly enormous size, and instead used a "bedspring" arrangement of many small
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Variations in target echo power caused by scintillation are interpreted as target motion.
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probes used onboard conical scanning maneuvers to track Earth in its orbit.
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target was acquired, the operator switched to conical scan for tracking.)
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units to improve their accuracy, as well as making it easier to steer the
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COSRO systems do not modify the transmit signal sent from the antenna.
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383:"Antenna Scanning Techniques for Estimation of Spacecraft Position"
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and two position signals that indicate left/right and up/down.
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led to the replacement of conical scan systems with
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69:Learn how and when to remove this message
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32:This article includes a list of general
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390:IEEE Antennas and Propagation Magazine
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431:"Weebau Spaceflight Encyclopedia"
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126:Deep Space Network
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141:Pioneer 11
137:Pioneer 10
59:March 2020
34:references
418:1045-9243
260:. In the
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315:Jamming
262:SCR-584
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