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Патент USA US2410917

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Nov. 12, 1946;
_
1.. CHlA-LIU YUAN ETAL
2,410,917
SHORT WAVE DIRECTION FINDER
Fiied Oct. ,51, 1941
Mm.m u
Patented Nov. 12, 1946
2,410,917
:i-UNITED‘. STATES harem" OFFICE
'“ W-Luke Cilia-Linw Yuan,‘ Pasadena, and Charles E.
~ ' Miller, Glendale, Cali?, assignors to California
7
_
Institute
Research =3 Foundation,
Pasadena,
Calif, a corporation of California '
' Application'?ctober a1, 1941, Serial No. 417,280 g
4 Claims.
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V
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c
,
(01. 250-11)
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" This invention relates to a radio antenna ap
of‘both the horizontal and vertical components
paratus especially adapted; for the determination
of the incoming radio wave,fwhich determina
tions should be necessarily simultaneously made,
of the directional receptionof short wave‘ radio
signals, particularlyradio signals of frequencies
or at least made within an ‘interval of time of a
few seconds. It is, therefore, an object of the
present invention to provide a simple antenna
structure capable of rapid operation and opera
tive to determine simultaneously or substantially
and the transmitter of a radio wave, said direc
simultaneously both the horizontal and vertical
tion being de?ned in two dimensions‘, namely, its 10 components of the direction of an incoming ra
in .the region of about 50 to 500 megacycles.
It is a general objectof the present invention
to provide‘ an antenna system cap-able of deter~
mining the direction between the antenna, system
projection on both horizontal and vertical planes.
dio wave.
In order that an antenna "system can measure
The apparatus of the present invention, to
‘the true direction between a transmitter and a
gether with various additional objects and ad
receiving antenna ‘system, it is necessary that the
vantages of the invention, will be more readily
receiving antenna system shall be affected‘ only 15 understood from a description of a preferred
form or example of an apparatus embodying‘th'e
by the direct radiation between the transmitter
and receiving antenna'system and be unaffected
by other re?ected or refracted radiations.v
__.Itv is, therefore, an object of the present inven
invention, and for this purpose we have here‘
after described, in connection with the accom
panying drawing, such preferred form or exam
tion toprovide'an antenna'system for measuring '20
the direction of an incidentv radio wave in'it'wo
ple of the invention.
,
In the drawing the ?gure is a simpli?ed per-_
dimensions, whichantenna system ‘is responsive
spective’ view of the direction ?nder.
Referring to the drawing, it will be appreciated
by those skilled in the art that the accuracy of
to re?ected or refracted. rays.
‘
‘
25 the results to be attained’ will be dependent upon
‘ _Oneiof the principal ?elds of utility of the am
the correct alignment of the various elements of
tenna system of the present invention is in de
the antenna system, and that the value of the
system depends upon good mechanical design re
termining the direction between the receiving
quiring the various elements to possess high
antenna system and a radio transmitter carried
by a balloon. In the determination of weather 30 mechanical rigidity and stability. In the draw
ing, the antenna system is illustrated as com
conditions ‘it is customary. to liberate balloons
only to ‘the directfradiation between the ‘trans
mitter and receiving antenna andlis unresponsive
carrying temperature and pressure indicating in
prising a directive antenna H designed for the
purpose of determining the horizontal angle of
incidence or azimuth of the incoming wave and
perature and pressure measurements .made" by 7 c: Cu a directive antenna V for determining the vertical
struments which are connected to a radiotrans
mitter for transmitting continuously‘ the tem
,the instruments carried bythe balloon. For these
temperature and pressure measurements to be
angle of incidence ‘of the incoming wave. The
‘directional antenna H is preferably ofthe Adcock
type. It is shown as consisting of'two spaced
of value it is necessary that the absolute position
apart‘ vertical antennas, each comprising an ele
of the ballon in space be known at all times.
Frequently, it is desirable to make such deter-' 40 ment l and an element I’. The elements l and
I’ are preferably each one-quarter wave length
minations under conditions where a direct visual
determination of the position of the balloon is
in length, and for mechanical rigidity are formed
_impossible._ By means of the apparatus of. the
of silver supporting rods, of Duralumin, or
present invention, it is possible to continuously
other suitable material. In each of the vertical
determine the direction between the radio trans- ‘ 45 antenna components of the ,Adcock system the
mitter carried by such a ‘balloon and the receiv
ing ‘antenna of the present invention, after which
‘the absolute positionof'the'balloon in space may
be readily calculated ‘from’ the altitudeof the
balloon as knownjfrom the transmittedsignalsi
ifromthe balloon.
r
r
r In. order to carry out the objects of the pres
rods‘ l4 and I’ are coaxially supported with their
adjacent ends spaced about I centimeter apart
by insulatingsupports 2, which are in turn sup
ported by a tubular spacer 3 sov as to maintain
50 vthe rods 1 and I’ in’ a plane normal to the axis
-X—X' with the rods l and I’ of the" two vertical
ent. invention, it is essentialto provide an an
antenna components parallel to each other'and
preferably spaced one-half wave length'apart.
ft'enna receiving system of‘simple design and
The'rods l and I’ of the vertical antenna com
:capable‘ of rapid manipulation for determination:
ponents of thesys-tem are connected together,
’
2,410,917
4
3
and similarly the rods I and l' are connected to
may be added for controlling the rotation, if de
gether by the line 4. Thereby the voltages intro
sired.
duced in the horizontal line 4 balance out each
other’s effect, so that horizontally polarized
downcoming waves do not a?ect the system. The
directional antenna V includes rods 5, each one
quarter wave length in length and coaxially sup
ported by the insulator 6. The rods? 5 together
constitute a dipole antenna which feeds the line
1. The dipole 5——5 is provided with a shield 8
in order that said antenna may be vusedv for de
termining the vertical angle of incidence of the
incoming wave. While the shield 8 may be (of
‘
Indicating means are provided for indicating
the extent of rotation of the system with respect
to both the Y-Y' axis and the Z—Z' axis. For
.
this purpose, the block I6 is indicated as having
a graduated quadrant- cooperating with- a ?xed
pointer I‘! carried by the bracket‘23, and the tube
24 is indicated as mounted below the tripod, a
10. pointer l9 cooperating with the graduated circle
7 l8 a?ixed to the tripod 25. The receiver I3 is
indicated as supported by the rod 24 so as to be
likewise rotated therewith.
The receiver l3 may be of any usual or pre
various types, sizes, ‘or con?gurations,’ it should
shield the dipole from re?ected waves without 15
impairing the receptive and directional char-.
acteristics of the dipole in its reception of the
direct wave from the transmitter.
We have discovered that a shield of the type
known as the corner reflection type is suited 20
to my purpose. Such a shield is preferably con
ferred design, preferably being designed for suit
able null point reception of signals of the desired
frequency. Thus, for example, a superheterodyne
receiver with a meter in the output circuit to in—
dicate the signal intensity is satisfactory for the
purpose intended.
The receiver should be well
shielded to eliminate stray pick-up. By mount
ing the receiver I3 on the tubular support 24 con
structed using’ rods or wires 9, each approxi
mately 0.6 wavelength in length, and supported
nected to rotate with the assembly, de?nite ad
vantages result, since it makes better shielding
‘so as to be mutually parallel and at the same
The rods 25 possible and eliminates the possibility of the
characteristics of the transmission line l2 being
altered by rotation of the assembly. The re
ceiver may be powered by batteries self-con
A, B, C between the planes is approximately 60°.
time parallel with the dipole 5—5.
or wires 5 are arranged in two planes whose
intersection is the line D—D'. The inclined angle
tained within the receiver case.
The dipole 5—-5 lies in a plane which bisects the
angle A, B, C‘ at a distance preferably slightly 30 ' In the operation of the apparatus of the pres
ent invention the assembly is ?rst rotated with
greater than one-half wave length from the line
respect to the Y-—Y’ axis with the Adcock an
D—D' and parallel thereto. The rods 9 should
be spaced not more than about 0.1 wave length,
tenna H connected to the receiver until a null
but the spacing used is not very critical. The
point indication is obtained, at which time the
two antennas H and V are connected, respectively, 35 X-X’ axis of the antenna system will be in the
with feed lines It] and l to a double pole double
vertical plane connecting the transmitter and re
ceiving antenna assembly. The assembly is then
throw switch H of suitable design for the fre
quencies employed, permitting connection at will
rotated by the ‘hand-wheel l5 with respect to
the Z—Z' axis to secure a null point reading, at
of either antenna to the line l2 which feeds a
receiver 13. The line It should be connected to 40 which timethe axis of the dipole 5--5 is in the
vertical ‘plane passing through the transmitter
theelectrical midpoint, which will also be the
geometrical midpoint if the system is carefully
constructed, of the line 4.’ ,The lines 4, 1, l0 and
I2 may be of any typeand construction dictated
by good engineering practice.
We have found lines constructed as follows
tobe suitable: The lines are formed from a
and
is
receiving
antenna.
,
V
'
.
With the apparatus of the present invention
it has been found possible in practice to accurate
ly follow the ?ight of a balloon carrying a radio
transmitter so as to determine in connection with
the height of said balloon its absolute position in
twisted pair of ?ber glass insulated No. 18
?exible wires threaded through ceramic beads
While the particular form of the apparatus
and enclosed within 1/2” copper tubing, which
herein described is well adapted to carry out the
tubing shields the lines from stray signal pick
objects of the present invention, it is to be under
up. The tubing should be thoroughly bonded at
stood that various modi?cations may be made
all joints.
and the invention includes all such modi?cations
The two antenna systems Hand V are so
and changes as comewithin the scope of the ap
pended claims.
mounted as to be rigidly held in ?xed positions
55
relative to each other and together constitute a
We claim:
'
'
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single combined directional antenna assembly.
1.~‘A directional antenna system effective for
The axes X—X’, Y-—Y', and Z—Z' intersect at
the determination of’ both the horizontal‘ and ver
angles of 90° each with the other. The dipole
tical angles of incidence of an incomingwave,
5-5 is maintained always parallel to the'axis
comprising an Adcock antenna arranged for the
determination of the horizontal angle of in
X_—X’. Thev lines '3, l0, and I2. each preferably
space.
a
.
.
multiple thereof. The antenna systems H and V
are suitably supported by the block IE to be cap
able of being rotated. together about the axis
cidence, a tube for rigidly supporting said Adcock
antenna and» housing and shielding feed lines
thereto, a vertically extending tube rigidly sup
ported at a right angle to said ?rst-mentioned
For this purpose, the block i8 is indicated I
as mounted upon a shaft 22 rotatably supported
tube, a ‘dipole antenna supported by said second,
have a length of one wave length or suitable
mentioned tube and having a feed line housed
in a bracket 23 and connected by gearing l4 to
therein and shielded thereby, said dipole an
a hand wheel l5.
tenna having ‘its axis parallel to the axisof said
For rotation of the assembly about the axis 70 ?rst-mentioned tube. a corner re?ection shield
Y-Y' the bracket 23 is indicated as mounted
'on the tube 24, which is rotatably supported by
‘a tripod 25, so that the entire assembly may be
rotated with respect to the supporting tripod.
for said dipole antenna with the elements of said
shield parallel to‘ said dipole antenna, means for
mounting both’ antennae for simultaneous. rota
tion abouta vertical axis, means for mounting said
lft is obvious that “mechanical means, not shown, 75 antennae for simiiltaneousrotation, about an axis
2,410,917
5
perpendicular with both said tubes, and means
for indicating said angles of rotation.
2. A directional antenna system, comprising
two tubular supporting members mounted at
right angles to each other and connected to a
common point for rotation of the tubes simulta
neously about a horizontal axis perpendicular to
the axis of both tubes, means for rotating the
tioned antenna rigidly held at right angles with
respect to said ?rst-mentioned supporting mem
ber and housing the feed lines to said second
mentioned directive antenna, a corner re?ection
shield for said second-mentioned antenna, means
for simultaneously rotating both directive an
tennae with respect to either a vertical axis or
a horizontal axis, and means for indicating the
two tubes about a vertical axis, means for indi
angle of rotation.
' '
cating both angles of rotation, a directive an 10
4. A directional antenna system, comprising
tenna connected with one tube for the determina-,
two supporting members extending at right
tion of the horizontal angle of incidence, a direc
angles to each other and connected to a common
tive antenna connected with the other tube for
point for rotation of the members simultaneous
determination of the vertical angle of incidence,
1y about a horizontal axis perpendicular to the
a corner re?ection shield for said last-mentioned 15 axes of said members, means for rotating the
antenna with its elements parallel to the an
two members about a vertical axis, means for
tenna elements of said second-mentioned direc
indicating both angles of rotation, a directive
tive antenna and also parallel with said ?rst
antenna connected with one member for the de
mentioned tube, and feed lines for said antennae
termination of the horizontal angle of incidence,
passing through said respective supporting tubes. 20 and a directive antenna connected with the other
3. A directional antenna system, comprising a
member for the determination of the vertical
directive antenna of the Adcock type, a support
, angle of incidence, a re?ectionashield for said.
ing member for said Adcock antenna housing the
last-mentioned antenna, and feed lines for said
feed lines thereto, a directive antenna for the de
antennae passing through said respective sup
termination of the vertical angle of incidence 25 porting members.
'
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having its elements parallel to said supporting
LUKE CHIA-LIU YUAN.
member, a supporting member for said last-men
CHARLES‘ E. MILLER.
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