1. A radar apparatus comprising:
an antenna unit having: a long range transmission antenna unit with a plurality of long range transmission array antennas; a short range transmission antenna unit with one or more short range transmission array antenna; and a reception antenna unit with a plurality of reception array antennas; and
a signal transmission and reception unit for transmitting a signal through at least one of the long range transmission antenna unit and the short range transmission antenna unit, and receiving an echo signal of the transmitted signal reflected off surroundings through the reception antenna unit,
wherein the long range transmission array antenna arranged in the middle of the plurality of long range transmission array antennas has the longest length and lengths of the other long range transmission array antennas decrease from the middle toward both sides,
wherein the number of the plurality of the long range transmission array antennas is proportional to a sensing distance of a reference long sensing range, the number of the one or more short range transmission antenna is proportional to a sensing distance of a reference short sensing range, and the number of the plurality of long range transmission array antennas is larger than the number of the one or more short range array antenna.
2. The radar apparatus of claim 1, wherein the long range transmission antenna unit, the short range transmission antenna unit, the reception antenna unit and the signal transmission and reception unit are mounted on one side of a printed circuit board.
3. The radar apparatus of claim 2, wherein a length of a first area on which the long range transmission antenna unit is to be mounted is longer than lengths of a second area on which the short range transmission antenna unit is to be mounted, a third area on which the reception antenna unit is to be mounted and a fourth area on which the signal transmission and reception unit is to be mounted.
4. The radar apparatus of claim 3, further comprising a protective member coupled to the top side of the printed circuit board to cover the signal transmission and reception unit for protecting the signal transmission and reception unit mounted on the printed circuit board.
5. The radar apparatus of claim 4, wherein the protective member has a size to cover only the fourth area of the printed circuit board on which the signal transmission and reception unit is mounted.
6. The radar apparatus of claim 1, further comprising a power divider for controlling power to be supplied to each of the plurality of the long range transmission array antennas and the one or more short range transmission array antenna.
7. A radar apparatus comprising:
an antenna unit having: a long range transmission antenna unit with a plurality of long range transmission array antennas; a short range transmission antenna unit with one or more short range transmission array antenna; and a reception antenna unit with a plurality of reception array antennas; and
a signal transmission and reception unit for transmitting signal through at least one of the long range transmission antenna unit and the short range transmission antenna unit, and receiving echo signal of the transmitted signal reflected off surroundings through the reception antenna unit,
wherein the long range transmission array antenna arranged in the middle of the plurality of long range transmission array antennas is the longest and the other long range transmission array antennas become shorter from the middle toward both sides,
wherein the number of the plurality of the long range transmission array antennas is determined to be inversely proportional to a sensing angle of a predetermined long sensing range, the number of the one or more short range transmission antenna is determined to be inversely proportional to a sensing angle of a predetermined short sensing range, and the number of the plurality of long range transmission array antenna is larger than the number of the one or more short range array antenna.
8. The radar apparatus of claim 7, wherein the long range transmission antenna unit, the short range transmission antenna unit, the reception antenna unit and the signal transmission and reception unit are mounted on one side of a printed circuit board.
9. The radar apparatus of claim 8, wherein a length of a first area on which the long range transmission antenna unit is to be mounted is longer than lengths of a second area on which the short range transmission antenna unit is to be mounted, a third area on which the reception antenna unit is to be mounted and a fourth area on which the signal transmission and reception unit is to be mounted.
10. The radar apparatus of claim 9, further comprising a protective member coupled to the top side of the printed circuit board to cover the signal transmission and reception unit for protecting the signal transmission and reception unit mounted on the printed circuit board.
11. The radar apparatus of claim 10, wherein the protective member has a size to cover only the fourth area of the printed circuit board on which the signal transmission and reception unit is mounted.
12. The radar apparatus of claim 7, further comprising a power divider for controlling power to be supplied to each of the plurality of the long range transmission array antennas and the one or more short range transmission array antenna.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A tanker truck for transporting a load of cementitious slurry to a remote work site, comprising:
a) a tank mounted upon a trailer, said tank having a discharge port and an intake port on opposing ends;
b) a manifold having an inlet port that is fluidly connected to said discharge port, said manifold further comprising an outlet port and a recirculation port which are fluidly connected to said inlet port, wherein each of said manifold ports may incorporate a control valve;
c) a pumping mechanism having an inlet, which is fluidly connected to said recirculation port, and an outlet, which is fluidly connected to said intake port;
wherein, when said manifold outlet port is closed and said manifold inlet and recirculation ports are open, said pumping mechanism continually circulates said load of cementitious slurry through said tank by extracting said slurry from said discharge port and reintroducing said slurry at said intake port.
2. The tanker truck of claim 1 further comprising a motorized towing vehicle connected to said trailer.
3. The tanker truck of claim 2, wherein said towing vehicle is integral to said trailer.
4. The tanker truck of claim 1, further comprising a conduit for dispensing cementitious slurry at the work site, said conduit fluidly attached to said manifold outlet port.
5. The tanker truck of 4 wherein said dispensing conduit comprises a spreader bar mechanism.
6. The tanker truck of claim 1 wherein said pumping mechanism is fluidly connected to said recirculation and intake ports by one or more tubular segments.
7. The tanker truck of claim 6 wherein said pumping mechanism and tubular segments are mounted external to said tank.
8. The tanker truck of claim 6 wherein each said tubular segments may comprise a flexible rubberized hose or a metal pipe.
9. The tanker truck of claim 6, further comprising auxiliary control valve fluidly connected between said pumping mechanism outlet and said intake port.
10. The tanker truck of claim 9 wherein said auxiliary control valve is manually actuated.
11. The tanker truck of claim 1 wherein said auxiliary control valve comprises an automatic check valve.
12. The tanker truck of claim 1 wherein said pumping mechanism is mechanically, electrically or hydraulically powered.
13. A method for prolonging the suspension time of cementitious slurry during transport to a remote work site, comprising:
a) filling a tank mounted upon a trailer with a load of cementitious slurry, said tank having a discharge port and an intake port on opposing ends;
b) fluidly connecting said discharge port to said intake port by means of a fluid connection that is external to said tank, wherein said fluid connection comprises a pumping mechanism; and
c) inducing a turbulent circulatory flow by pumping said slurry from said discharge port to said intake port.
14. The method of claim 13 wherein circulatory flow has a Reynold’s number in a turbulent region for said slurry.
15. The method of claim 14 wherein said turbulent region has a Reynold’s number greater than 2,000.
16. The method of claim 13 wherein said load of cementitious slurry circulates through said tank in approximately half the normal settling time of the cement particles within the slurry.