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Патент USA US2412703

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Dec. 17, 1946.
|. WOLFF
2,412,703
RADIO LOCATOR DEVICE
Filed Aug. 29, 1941
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|; WOLFF
2,412,703
RADIO LOGATOR DEVICE‘
Filed-Aug. 29, 1941
2 .SheetsrSheet 2
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Patented Dec. 17,
UNITED STATES PATENT OFFKIE
2,412,703
RADIO LOCATOR DEVICE
Irving Wol?“, Merchantville, N. J., assignor to
Radio Corporation of America, a corporation
of Delaware
Application August 29, 1941, Serial No. 408,849
13 Claims. _ (Cl. 250—1.62)
1
2
This invention relates to improvements in radio
locator devices and particularly to a radio looa-‘
tor device in which beams of pulse energy are
' acters indicate similar elements in the draw
ings.
Referring to Fig. 1, a pulse generator I is
' successively radiated in predetermined zones and
in which the echo signals from an object within "
said zones are applied to a cathode ray tube for
connected to the transmitter 3 which is in turn
connected by a transmission line 5 to a rotary
' four-position switch ‘I.
indicating the distance and zone location of the
object. Furthermore, the instant invention re
lates to an improvement in the indicating de
vice disclosed in my copending application Se 10
rial No. 259,057, ?led February 28, 1939, for “Ob
ject detection and location.”
through four distinctive and predetermined zones.
An object within the zones or any one of them
vwill re?ect the pulses. The received pulses are
directive antennas 9, ll, l3, I5. The antennas
may be provided with re?ectors to obtain the de
sired degree of directivity in predetermined zones.
The several antennas are also connected through
the transmission line 5 to a receiver 11.
In the copending application a radio locator
, of the pulse-echo type is described. The pulse
energy is successively applied to four directive
antennas from which the pulse energy is radiated
The switch is arranged
to connect. the transmitter successively to four
15
The
output of the receiver is preferably balanced
and is applied to a pair of rotary four-position
switches I9’ and 2|, respectively, which are oper
ated in synchronism'with the antenna switch ‘I
by a motor 23. In practice, the several switches
‘I, I 9, 2| may be connected on a common shaft
coupled to the motor.
applied to a cathode ray indicator. The indica- - 20
A sweep circuit generator 25 is connected
tor is provided with a sweep circuit. which sweeps
through ?lters 21 to the two movable contacts
the ray along a calibrated distance scale. The
29 of the upper switch l9 and through similar
de?ecting electrodes of the cathode ray 'tube are
filters 31 to the two movable contacts 33 ofthe
connected to the receiver through appropriate
lower switch 2|. The movable contacts 29 may
switching and ?lter means so that additional and 25 be connected through resistors (not shown) to
distinctive de?ections of the cathode ray indicate
the upper ‘de?ecting electrodes 35, 31 of a cath
the location of the object as a function of dis
ode ray tube 39. The movable contacts 33 may
tance and with respect to one or more of the
be connected through resistors (not shown) to
predetermined zones of radiation.
the lower de?ecting electrodes 4| , 43 of the oath
In practice the distinctive de?ections are ob 30 ode ray tube. The de?ecting electrodes form
tained by‘ de?ecting the ray at an angle with
the sides of a quadrilateral ?gure. The output
respect to the sweep. The apparatus disclosed
of the receivers I’! is preferably balanced and
in the said copending application for obtaining
is connected to the ?xed contacts of the switches
the angular de?ections may be greatly simpli
19 and 33 so that the output potential from the
?ed according to an improved embodiment of the 35 receiver I1 is applied to the de?ecting electrodes
instant invention and may be improved accord
as follows: In the ?rst switch position a to elec
ing to another embodiment of the invention.
trodes v3‘! and M; in the second switch position
One of the objects of the invention is to pro
b to electrodes 35 and 43; in the third switch
vide improved means for de?ecting a cathode
position 0 to electrodes M and 31 but reversed
ray along three coordinates. Another object is
in polarity from switch position a; and in the
to provide improved means for indicating the 40 fourth switch position d to electrodes 4i and 35
distance and location of a radio pulse re?ecting
but reversed in polarity from switch position b.
object. Another object is to provide an improved
The operation of the device is essentially as
and simpli?ed cathode ray sweep for a radio loca
follows: The pulses from the generator I key the
tor whereby distinctive traces are obtained to 45 transmitter 3, which applies pulses of radio fre
indicate the distance and reference zone of- a ' quency energy to the antennas 9, ll, l3 and I5
detected object and to provide an illusion of dis
in succession. From each antenna the pulses
tance.
-
are radiated directively in predetermined zones
The invention will be described by referring
or regions. For example, the regions may be
to the accompanying drawings in which Figure 1 50 arranged with respect to a reference direction
is a schematic diagram of one embodiment of
the invention; Figure 2 is a schematic diagram 01’
the preferred embodiment of the invention; and
Figures~ 13 and, 4 are illustrations used in de
scribing-__the invention. Similar reference char
line as shown in Fig. 3. The sweep generator volt
age is synchronized with each outgoing pulse, and
‘ is applied to the pairs of de?ecting electrodes
(:35, 31 and Ill, 43; respectively) so that a con
55 ventional trace is formed by__ de?ecting vertical
2,412,703
‘
3
ly the cathode ray along the diagonal formed
by the pairs of electrodes. The ?lters 21 and ii
4
ciding substantially with a diagonal of said sym
metrically arranged elements. and means for con
nectlng said de?ecting elements to said receivinz
are designed to pass the de?ecting currents and
to reject the echo signal currents. Since the sig
means to de?ect said ray at angles to said dias
onal sweep corresponding successively to said
nal currents are applied to the diagonally ar
ranged de?ecting electrodes in pairs (for exam
ple 31 and ll ) it follows that the signal currents
will de?ect‘ the ray along an angle and if prop~
zones.
2. A radio locator including means for atab
lishing pulses of radio frequency energy. means
for radiating said energy distinctively in zones 01'
erly polarized the angle will be upperward and
to the right for the corresponding zone of radia 10 predetermined directivity, means for receiving
said energy after re?ection from an object with
tion. As the synchronized switch is operated
in said zones, a cathode ray tube including four
the angular de?ections will correspond to the
de?ecting elements respectively located at the
several zones of radiation. For example, switch
sides of a rectangle, means for sweeping said ray
position a may correspond to upper right: 1) to
lower right; c to lower left; and d to upper left. 15 in synchronism with said pulse radiation along
a distance coordinate coinciding substantially
By connecting the control electrode 45 to the
with one of the diagonals of said rectangle, and
sweep generator, the brightness of the trace may
means for connecting said de?ecting elements to
be varied as a function of distance so that more
said receiving means to de?ect said ray at angles
remote re?ections appear as weaker signals to
20 to said diagonal sweep corresponding successively
give the illusion of distance.
to said zones.
The above described arrangement may be fur
3. A radio locator including means for estab
ther simpli?ed by applying the vertical de?ect
lishing pulses of radio frequency energy, means
ing voltages to a pair of magnetic de?ecting coils
for radiating said energy distinctively in adjacent
41 as shown in Fig. 2. This connection is prefer
and different zones, means for receiving said en
able because it makes it possible to omit the ?l
ergy after re?ection from an object within said
ters 21, 3| of Fig. 1. The balance of Fig. 2 cor
zones, a cathode ray tube including four sym
responds to Fig. 1, and the operation of Fig. 2
metrically arranged de?ecting elements, means
being substantially the same as that of Fig. l.
including said de?ecting elements for sweeping
the description thereof will not be repeated. The
said ray in synchronism with said pulse radiation
indications obtained in either circuit arrange
along a distance coordinate coinciding substan
ment are the same for the same object location
tially with a diagonal of said symmetrically ar
and distance. Fig. 4. is a graph illustrating the
ranged elements, and means for connecting said
nature of the indications by appropriate legends.
de?ecting elements to said receiving means to de
The distance illusion is indicated by making the
?ect said ray at angles to said diagonal sweep
lines heaviest for the reflections from the near
corresponding successively to said zones.
est object and lightest for the re?ections from
4. A radio locator including means for estab
the most remote objects. It should be understood
lishing pulses of radio frequency energy, means
that the brightness control may be made ?xed
for radiating said energy distinctively in zones,
instead of variable, if the user prefers to elim
inate the “distance illusion” by connecting the 40 means for receiving said energy after reflection‘
from an object within said zones, a. cathode ray
electrode to a source of ?xed bias potential.
Thus the invention has been described as a
radio locator in which the signals corresponding
to the energy from a re?ecting object are ap
plied to an improved cathode ray indicator. The
indicator includes de?ecting elements which are
located at the sides of a'square. The ray is de
?ected along a distance coordinate substantially
corresponding to a diagonal of the square. The
ray is further de?ected at an angle to the dis- ;
sible to identify the zone or zones including the
the distance of the body as a function of the dis
tance scale. A distance or perspective illusion
may be created by varying the intensity of the
cathode ray as a function of distance.
I claim as my invention:
1. A radio locator including means for estab
lishing pulses of radio frequency energy, means
for radiating said energy distinctively in adjacent
and different zones, means for receiving said en
ergy after re?ection from an object within said
zones, a cathode ray tube including four sym
metrically arranged de?ecting elements, means
for sweeping said ray in synchronism with said
pulse radiation along a distance coordinate coin
de?ecting elements to said receiving means to
de?ect said ray at angles to said diagonal sweep
corresponding successively .to said zones.
lishing pulses of radio frequency energy,v means
for radiating said energy distinctively in zones,
ments is operated in synchronism with switching -'
re?ecting object. It is also possible to observe
tially with a diagonal of said symmetrically ar
ranged elements, and means for connecting said
5. A radio locator including means for estab
tance coordinate by applying the echo signals
in appropriate polarity to pairs of the de?ecting
elements. The switch which applies the echo
signals from the receiver to the de?ecting ele
means which applies the pulses to the differently
directed antennas. Since the angular de?ections,
corresponding to the received echo signals, each
correspond to the predetermined zones, it is pos
tube including four symmetrically arranged de
?ecting elements, additional means for sweeping
said ray in synchronism with said pulse rediation
along a distance coordinate coinciding substan_
means for receiving said energy after re?ection
from an object within said zones, a cathode ray
tube including four symmetrically arranged de
?ecting elements, magnetic de?ecting means for
sweeping said ray in synchronism with said pulse
radiation along a distance coordinate coinciding
substantially with a diagonal of said symmetri
cally arranged elements, and means for connect
ing said de?ecting elements to said receiving
means to de?ect said ray at angles to said diago
nal sweep corresponding successively to said
zones.
6. A radio locator including means for estab
lishing pulses of radio frequency energy, means
for radiating said energy successively in zones of
predetermined directivity, means for receiving
said energy after re?ection from an object Within
said zones, a cathode ray tube including four de
?ecting elements respectively located at the sides
of a quadrilateral ?gure, means for sweeping said
ray in synchronism with said pulse radiation
75 along a distance coordinate coinciding substan
2,412,703
tially with one of the diagonals of said quadri
and means connected to said cathode ray tube to
lateral ?gure, and means for connecting said de- ‘
regulate the brightness of the ray as a function
?eeting elements to said receiving means in syn
chronism with the radiation of said pulses in said
zones to de?ect said ray at angles to said diago
nal sweep corresponding successively to said
of said distance coordinate.
9. A cathode ray indicator including, in combi
nation, a cathode ray tube having four de?ecting
elements arranged to form the sides of a quadri
lateral ?gure, means for sweeping said ray along
zones.
7. A radio locator including means for estab
one diagonal of said ?gure, and means for suc
cessively de?ecting said ray toward the sides of
lishing pulses of radio frequency energy, means
for radiating said energy in zones of predeter 10 said ?gure so that indications may be obtained
along three coordinates.
mined directivity, means for receiving said energy
10. A cathode ray indicator including, in com
after re?ection from an object within said zones,
bination, a cathode ray tube having four de?ect
a cathode ray tube including four de?ecting ele
ing elements arranged substantially parallel to the
ments respectively located at the sides of a rec
tangle, means for sweeping said ray in synchro 15 sides of a quadrilateral ?gure, additional ele
ments for sweeping said ray along one diagonal of
nism with said pulse radiation along a distance
said ?gure, and means including said elements
coordinate coinciding substantially with one of
for successively de?ecting said ray toward the
the diagonals of said rectangle, means for con
sides of said ?gure so that indications may be
necting said de?ecting elements to said receiving
means to de?ect said ray at angles to said diago 20 obtained along three coordinates.
11. A cathode ray indicator including, in com
nal sweep corresponding successively to said
zones, and means for applying potentials varying
bination, a cathode ray tube having four de?ect
ing elements arranged to form the sides of a
with said diagonal sweep for varying the intensity
quadrilateral ?gure, magnetic means for sweep
of said cathode ray.
8. A radio locator including means for estab 25 ing said ray along one diagonal of said ?gure,
and means including said elements for succes
lishing pulses of radio frequency energy, means
sively de?ecting said my toward the sides of said
for radiating said energy in different zones, means
?gure to obtain indications along three coordi
for receiving said energy after re?ection from an
nates.
object within said zones, a cathode ray tube in
cluding four symmetrically arranged de?ecting 30 12. An indicator according to claim 9 including
means for varying the intensity of said cathode
electrodes, means for sweeping said ray along a
distance coordinate coinciding with a diagonal of
ray as a function of one of said coordinates.
said symmetrically arranged electrodes in syn
13. An indicator according to claim 10 includ
ing means for varying the intensity oi'said cath
chronism with said pulse radiation, means for
connecting said cathode ray tube to said receiver 35 ode ray as a function of one of said coordinates.
to de?ect said ray at angles to said diagonal
sweep corresponding successively to said zones,
mvma worm‘.
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