US3601339A
Expired / Lapsed
US
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Aircraft-landing systems
Assignee: Allard Way Holdings Ltd
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Filing: 1968-06-03
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Granted: 1971-08-24
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Expires: 1988-06-03
Abstract
Abstract The present invention resides in a system employing a modified glide slope control law to give a more precise control over the glide slope made in landing and also over the flare or flareout thereof. The modified law which defines a pitch attitude demand signal ( theta D) reads: IN WHICH: theta D pitch attitude demanded by the control law; G glide slope gearing ratio viz: the number of degrees of pitch attitude demanded per degree of deviation from the glide slope; Beta GLIDE SLOPE DEVIATION; T2 the lag time constant afforded by the provision of smoothing capacitors on the glide slope receiver output; and K, T3 and T4 are constants for the aircraft in which the system is installed.
Inventors
- 👤 Ian A Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:56
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0676; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
102 words
An aircraft-landing system comprising a glide slope receiver to receive glide slope data transmitted from the ground, and means receiving an output of the glide slope receiver to provide a pitch attitude demand signal hereinbelow called the predetermined pitch attitude demand signal) in accordance with a glide slope control law, including at least an integral function and a proportional function of glide slope deviation, and wherein multiplier means are connected in circuit for contributing to the predetermined pitch attitude demand signal as a further component thereof, a function of delta Va, delta Va being the difference between the actual and demanded airspeeds.
Claim 2
Dependent Claim
102 words
An aircraft-landing system comprising a glide slope receiver to receive glide slope data transmitted from the ground, and means receiving an output of the glide slope receiver to provide a pitch attitude demand signal hereinbelow called the predetermined pitch attitude demand signal) in accordance with a glide slope control law, including at least an integral function and a proportional function of glide slope deviation, and wherein multiplier means are connected in circuit for contributing to the predetermined pitch attitude demand signal as a further component thereof, a function of delta Va, delta Va being the difference between the actual and demanded airspeeds.
Claim 3
Dependent Claim
20 words
An aircraft-landing system according to claim 1, wherein the function of delta Va is the airspeed crossfeed gearing ratio (x).
Claim 4
Dependent Claim
16 words
means for generating a second signal, said second signal representing instantaneous pitch attitude ( theta );
Claim 5
Dependent Claim
16 words
means for generating a second signal, said second signal representing instantaneous pitch attitude ( theta );
Claim 6
Dependent Claim
42 words
a second multiplier circuit to provide the term G , the pitch attitude gearing ratio, said second multiplier circuit receiving as an input, the output signal of said first multiplier circuit and producing an output signal representing the term Beta (1/(1+T2S))G ,
Claim 7
Dependent Claim
42 words
a second multiplier circuit to provide the term G , the pitch attitude gearing ratio, said second multiplier circuit receiving as an input, the output signal of said first multiplier circuit and producing an output signal representing the term Beta (1/(1+T2S))G ,
Claim 8
Dependent Claim
16 words
means for generating a second signal, said second signal representing instantaneous pitch attitude ( theta );
Claim 9
Dependent Claim
16 words
means for generating a second signal, said second signal representing instantaneous pitch attitude ( theta );
Claim 10
Dependent Claim
29 words
multiplier means generating a third signal, said third signal representing a term qgq in which q is the instantaneoUs pitch rate and Gq is the pitch rate gearing ratio;
Claim 11
Dependent Claim
29 words
multiplier means generating a third signal, said third signal representing a term qgq in which q is the instantaneoUs pitch rate and Gq is the pitch rate gearing ratio;
Claim 12
Dependent Claim
10 words
an amplifier to provide the first proportional term of unity,
Claim 13
Dependent Claim
10 words
an amplifier to provide the first proportional term of unity,
Claim 14
Dependent Claim
29 words
multiplier means generating a third signal, said third signal representing a term qGq in which q is the instantaneous pitch rate and Gq is the pitch rate gearing ratio;
Claim 15
Dependent Claim
29 words
multiplier means generating a third signal, said third signal representing a term qGq in which q is the instantaneous pitch rate and Gq is the pitch rate gearing ratio;
Claim 16
Dependent Claim
38 words
An aircraft-landing system according to claim 2, wherein the airspeed crossfeed gearing ratio (x) employed is one having the value: 0.6 percent eta D + or - 10 percent, in which eta D is the elevator demand signal.
Claim 17
Dependent Claim
18 words
An aircraft-landing system comprising in combination the following means for producing an elevator demand signal from component signals:
Claim 18
Dependent Claim
18 words
An aircraft-landing system comprising in combination the following means for producing an elevator demand signal from component signals:
Claim 19
Dependent Claim
12 words
a summing means for summing said first, second and third signals; and
Claim 20
Dependent Claim
12 words
a summing means for summing said first, second and third signals; and
Claim 21
Dependent Claim
8 words
an integrator to provide the integral term 1/T1s,
Claim 22
Dependent Claim
8 words
an integrator to provide the integral term 1/T1s,
Claim 23
Dependent Claim
11 words
summing means for summing said first, second and third signals; and
Claim 24
Dependent Claim
11 words
summing means for summing said first, second and third signals; and
Claim 25
Dependent Claim
47 words
multiplier means, receiving said summated first, second and third signals and multiplying them by a fourth signal representing G eta , the elevator demand gearing ratio of the aircraft, whereby there is produced at the output of this multiplier means an elevator demand signal ( eta D).
Claim 26
Dependent Claim
47 words
multiplier means, receiving said summated first, second and third signals and multiplying them by a fourth signal representing G eta , the elevator demand gearing ratio of the aircraft, whereby there is produced at the output of this multiplier means an elevator demand signal ( eta D).
Claim 27
Dependent Claim
9 words
a lag circuit to provide the term KS/((1+T3S) (1+T4S)),
Claim 28
Dependent Claim
9 words
a lag circuit to provide the term KS/((1+T3S) (1+T4S)),
Claim 29
Dependent Claim
47 words
multiplier means, receiving said summated first, second and third signals and multiplying them by a fourth signal representing G eta , the elevator demand gearing ratio of the aircraft, whereby there is produced at the output of said multiplier means an elevator demand signal ( eta D).
Claim 30
Dependent Claim
47 words
multiplier means, receiving said summated first, second and third signals and multiplying them by a fourth signal representing G eta , the elevator demand gearing ratio of the aircraft, whereby there is produced at the output of said multiplier means an elevator demand signal ( eta D).
Claim 31
Dependent Claim
29 words
A system according to claim 1, wherein the output of the glide slope receiver is a signal representing Beta , the glide slope deviation, and wherein said system comprises:
Claim 32
Dependent Claim
16 words
summing means providing a common output from said amplifier, said integrator and said lag circuit, and
Claim 33
Dependent Claim
16 words
summing means providing a common output from said amplifier, said integrator and said lag circuit, and
Claim 34
Dependent Claim
18 words
An aircraft-landing system comprising in combination the following means for producing an elevator demand signal from component signals:
Claim 35
Dependent Claim
18 words
An aircraft-landing system comprising in combination the following means for producing an elevator demand signal from component signals:
Claim 36
Dependent Claim
40 words
means for feeding said output signal of said second multiplier circuit simultaneously to said amplifier, said integrator and said lag circuit to produce in said common output, a signal theta D, the predetermined pitch attitude signal, representing the following terms:
Claim 37
Dependent Claim
40 words
means for feeding said output signal of said second multiplier circuit simultaneously to said amplifier, said integrator and said lag circuit to produce in said common output, a signal theta D, the predetermined pitch attitude signal, representing the following terms:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |