David C Andersen

US Patent:

56857721, Nov 11, 1997

Filed:

Nov 9, 1994

Appl. No.:

8/336338

Inventors:

David P. Andersen - Burnsville MN
Michael Farmer - Eagan MN

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

A01F 1250

US Classification:

460 6

Abstract:

A device to measure the volume and weight of a harvested grain crop during the harvesting of the grain crop with a weight measurement member including an elevator for moving grain from a lower elevation to a higher elevation with the elevator having a rotatable belt and a set of paddies thereon for moving grain from the lower elevation to the higher elevation with a torque sensor to determine the increase in torque on the shaft as a result of having to raise the kernels of grain from the lower elevation to the higher elevation and an acoustic volume measurement member to obtain information on the depth of the grain that is correlatable to volume of the harvested crop.

US Patent:

55215149, May 28, 1996

Filed:

Jan 3, 1995

Appl. No.:

8/368270

Inventors:

George F. Nelson - Coon Rapids MN
David P. Andersen - Burnsville MN

Assignee:

Loral Corporation - New York NY

International Classification:

G01R 2726
G08B 2100

US Classification:

324660

Abstract:

A broken tine detector for agricultural machines is provided for machines such as balers and forage harvesters. The tines form a first plate of a capacitor which rotates about the axis of a reel. The second plate of the capacitor may be provided by a back-plate which is located at the front of an agricultural machine adjacent to the ends of the tines and which is connected to machine ground. An alternate embodiment of the invention is devised by utilizing conductive strips on a tine guard. Each of the conductive strips may be utilized to form the second plate of the capacitor. The row of tines pass through individual slots in the tine guard so that a particular row in which the tine is broken may be detected. When a tine is broken the total capacitance between the tines and the back-plate will change and will be detected, and an indication will be supplied to an operator so that the operator may stop the machine and remove the tines.

US Patent:

53693736, Nov 29, 1994

Filed:

Oct 16, 1992

Appl. No.:

7/961986

Inventors:

George F. Nelson - Coon Rapids MN
David P. Andersen - Burnsville MN

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

H03H 1900

US Classification:

327121

Abstract:

A sine wave oscillator provides an input signal to a step-recovery diode (SRD). The SRD produces a wideband series of harmonics of the frequency of the sine wave oscillator that are represented as "lines" in a power r. f. frequency plot. The output of the SRD is supplied to one or more bandpass filters or lowpass filters which provide selection windows so that only a specified number of harmonic lines are passed within a selection window. These specified harmonic lines are then coupled to one or more high speed input switches which are coupled to one or more high speed selection switches. The high speed selection switches are each coupled to a separate bandpass filter that is tuned to a different bandpass frequency range. Each bandpass filter corresponds to one or to several adjacent lines of the selection windows. The selection switches are connected so that various ones of them may be turned on to form either selective parallel or serial combinations, or even simultaneous parallel/serial compositions, of the frequency line components under the control of a digital switch controller.

US Patent:

45504253, Oct 29, 1985

Filed:

Sep 20, 1982

Appl. No.:

6/420545

Inventors:

David P. Andersen - Burnsville MN
Raymond C. Hedin - Apple Valley MN
John F. Siebenand - Eagan MN

Assignee:

Sperry Corporation - New York NY

International Classification:

G10L 100
H03K 1322

US Classification:

381 30

Abstract:

An analog speech signal is sampled of a nominal rate of 6 kilohertz and digitized in a Mu-Law Encoder. The digital output of the Mu-Law Encoder is converted by a microprocessor performing table look-up to linearized pulse code modulation (PCM) samples nominally of eight bits per sample. Using a BSPCM (Block Scaled Pulse Code Modulation) method, in each block of nominally 246 eight-bit PCM samples (representing approximately 41 milliseconds), the maximum and minimum sample values are found and used to calculate a scale factor equal to the maximum sample value minus the minimum sample value, with the difference being then divided by a constant number nominally equaling 16. Then the BSPCM samples are generated from the PCM samples each as a corresponding one PCM sample minus the minimum PCM sample value, the difference being then divided by the scale factor. In effect, the bit rate is reduced by adjusting the step size to follow the local block dynamic range. The BSPCM samples so created are susceptible to signal processing operations like as to PCM samples.

US Patent:

51608014, Nov 3, 1992

Filed:

May 20, 1991

Appl. No.:

7/702988

Inventors:

David A. Andersen - Mound MN
Keith A. Kiefer - Ramsey MN
Leonard D. Hones - Eden Prairie MN

Assignee:

Alliant Techsystems Inc. - Minneapolis MN

International Classification:

F42C 1704

US Classification:

89 6

Abstract:

A system for programming the function mode of a munition fuze without supplying electrical power to the fuze includes an arrangement of programmable elements located internally of the munition that are electrically conductive but which remain electrically unpowered until after munition firing, and a programming mechanism located externally of the munition being operable to mechanically program the conductive elements. The programmable elements are a series of concentric bands attached to the interior of the munition casing and spaced from one another along the munition axis and separated from casing wall by an electrically insulating layer. The programming mechanism is a plurality of punch heads aligned with the concentric bands and capable of being actuated such that only selected ones of the punch heads strike the exterior of the munition casing causing an indentation in the casing that penetrates the insulating layer and makes electrical contact with the selected ones of the concentric bands. By maintaining the munition casing at a common potential, a coded binary sequence of opened and closed switches is formed by the concentric bands setting the function mode of the fuze which can be subsequently read once electrical power is generated upon munition firing.

US Patent:

55835058, Dec 10, 1996

Filed:

Sep 11, 1995

Appl. No.:

8/526352

Inventors:

David P. Andersen - Burnsville MN
Steven A. Murphy - Apple Valley MN

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

G01S 740

US Classification:

342 13

Abstract:

A radar pulse detection and classification system receives times-of-arrival of pulses from simultaneous emitters over a wide range of pulse repetition frequencies (PRF's). The pulses are deinterleaved into bands of pulse repetition intervals (PRI's) so that a fixed number of pulses are required for detection of an emitter regardless of the PRI of the emitter. The pulse periodicities of the pulses in a pulse stream are determined by autocorrelation, and candidate emitter PRI's are selected from the pulse periodicities which were determined by autocorrelation. The pulses of candidate emitters are time-integrated to obtain time-integrated signals, and emitters are detected from peaks in the time-integrated signals. The time-continuity of said pulses are measured to determine emitter existence. The system receives pulses from both jittered and non-jittered emitters.

US Patent:

56065043, Feb 25, 1997

Filed:

Feb 17, 1995

Appl. No.:

8/389992

Inventors:

David P. Andersen - Burnsville MN

Assignee:

Lockheed Martin Corporation - Bethesda MD

International Classification:

A01D 4500
G06F16500

US Classification:

36442407

Abstract:

A combine or harvesting machine has a header on its front end which is moved into a crop swath when harvesting the crop. The swath width of the crop in front of the header is measured with two acoustic range sensors that are mounted on opposite ends of the header in a horizontal plane so they face each other. The data that is received may be utilized either to determine crop yield or to control an automatic steering control, or both.

US Patent:

43694250, Jan 18, 1983

Filed:

Jun 8, 1981

Appl. No.:

6/271333

Inventors:

David P. Andersen - Burnsville MN
Eugene P. Chicoine - Burnsville MN

Assignee:

Sperry Corporation - New York NY

International Classification:

G01C 2300
G01C 2120

US Classification:

340 26

Abstract:

A ground-to-air, voiced alerting system whereby a ground controller can communicate traffic warning messages to a pilot in an automatic fashion via a voice radio band and a voiced message generator. The system generally comprising means for transmitting a frequency shift key (FSK) encoded message to the pilot via the voice band and receiver means for decoding the same message. The decoding means, in turn, generally comprising means for identifying specific aircraft and additional means for decoding the message and producing the voiced message over the pilot's head set.