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US3890618A
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Bessel sequence echo-location system
Assignee: United States Department of the Navy
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Filing: 1973-08-30
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Granted: 1975-06-17
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Expires: 1993-08-30
Abstract
Abstract A transmitter for use in an echo-location system for radar or sonar, comprising a source of signals consisting of a sequence of weighted pulses conforming to the equation WHERE Jn(x) denotes the nth Bessel function of the first kind, p(t) is the time function corresponding to an elementary pulse, and T is the spacing between elementary pulses. In a specific implementation of the transmitter, the source of signals comprised J source of signals delta (t); a delay line connected to the impulse signal source delta (t); a plurality of (2N + 1) weighted taps connected to the delay line, in which the tap weightings from the input to the output of the delay line are J N(x), . . . , JO(x), . . . JN(x); and a signal summer connected to the outputs of the plurality of weighted taps, the output of the summer having the desired waveform for the signal to be transmitted, namely A receiver which may be used with the specific transmitter of the echo-location system comprises similar components, with the tap weightings from the input to the output of the receiver delay line are JN(x), . . . , JO(x), . . . , J N(x), the reverse of the transmitter signal weightings.
Inventors
- 👤 Jeffrey M Speiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:31
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6406; G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/106
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
A transmitter for use in an echo-location system for radar or sonar, comprising: a source of signals comprising a sequence of weighted pulses conforming to the equation
Claim 2
Dependent Claim
27 words
A transmitter for use in an echo-location system for radar or sonar, comprising: a source of signals comprising a sequence of weighted pulses conforming to the equation
Claim 3
Dependent Claim
100 words
The transmitter according to claim 1, wherein the source of signals comprises: a source of signals delta (t); a delay line connected to the impulse signal source delta (t); a plurality of (2N + 1) weighted taps connected to the delay line, in which the tap weightings from the input to the output of the delay line are J N(x), . . . , JO(x), . . . J N(x); and a signal summer connected to the outputs of the plurality of weighted taps, the output of the summer having the desired waveform for the signal to be transmitted, namely
Claim 4
Dependent Claim
93 words
A receiver to be used with the transmitter of the echo-location system according to claim 1, comprising: a delay line, for receiving the transmitted Bessel sequence signal; a plurality of (2N + 1) weighted taps connected to the receiver delay line, in which the tap weightings from the input to the output of the receiver delay line are J N(x), . . . , JO(x), . . . , J N(x), the reverse of the transmitter signal weightings; and a signal summer connected to the outputs of the plurality of receiver weighted taps.
Claim 5
Dependent Claim
48 words
An echo-location system according to claim 3, wherein the transmitter further comprises: a low-pass filter, whose input is connected to the output of the source of signals; and wherein the receiver further comprises: a low-pass filter, whose input is connected to the output of the receiver signal summer.
Claim 6
Dependent Claim
93 words
A receiver to be used with the transmitter of the echo-location system according to claim 2, comprising: a delAy line, for receiving the transmitted Bessel sequence signal; a plurality of (2N + 1) weighted taps connected to the receiver delay line, in which the tap weightings from the input to the output of the receiver delay line are J N(x), . . . , JO(x), . . . , J N(x), the reverse of the transmitter signal weightings; and a signal summer connected to the outputs of the plurality of receiver weighted taps.
Claim 7
Dependent Claim
48 words
An echo-location system according to claim 5, wherein the transmitter further comprises: a low-pass filter, whose input is connected to the output of the source of signals; and wherein the receiver further comprises: a low-pass filter, whose input is connected to the output of the receiver signal summer.
Claim 8
Dependent Claim
24 words
The transmitter according to claim 2, wherein the delay line, the weighted taps and the signal summer comprise an interdigitated acoustic surface wave device.
Claim 9
Dependent Claim
32 words
The transmitter according to claim 7, wherein the tap weightings comprise groups of finger pairs, each pair in a specific group having the same weighting; the transmitter thereby being a band-pass transmitter.
Claim 10
Dependent Claim
109 words
A receiver to be used with the transmitter of the echo-location system according to claim 8, comprising: a delay line, for receiving the transmitted Bessel sequence signal; a plurality of (2N + 1) weighted taps connected to the receiver delay line, in which the tap weightings from the input to the output of the receiver delay line are J N(x), . . . , JO(x), . . . J N(x), the reverse of the transmitter signal weightings; and a signal summer connected to the outputs of the plurality of receiver weighted taps; the delay line, the weighted taps and the signal summer comprising an interdigitated acoustic surface wave device.
Claim 11
Dependent Claim
32 words
A receiver according to claim 9, wherein the tap weightings comprise groups of finger pairs, each pair in a specific group having the same weighting; the receiver thereby being a band-pass receiver.
Claim 12
Dependent Claim
39 words
A receiver and transmitter according to claim 10, wherein some of the fingers of the finger pairs have segments which do not contribute to the weighting, but are nevertheless left on the substrate upon which all fingers are disposed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |