Eric A Carlson

US Patent:

49766198, Dec 11, 1990

Filed:

Mar 6, 1989

Appl. No.:

7/319496

Inventors:

Eric J. Carlson - Mesa AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

F41G 100
F41G 326

US Classification:

434 16

Abstract:

A method for pinpointing the actual coordinate location of a passive location device for a simulated battlefield condition is described. A plurality of actuators transmit to a passive location device which includes the method for determining its coordinate location. The coordinate location of a desired impact point is transmitted to the location device. The determination method initializes a starting coordinate location as the impact point of a round of munition. The method then iteratively determines the gradient direction of the position and moves the position estimate in the direction of gradient. As the estimated position approaches the true position successively smaller steps are taken and additional coordinate directions introduced into the solution until the convergence solution is terminated with least rms error in the neighborhood of the true coordinate position of the passive location device.

US Patent:

40064778, Feb 1, 1977

Filed:

Jan 6, 1975

Appl. No.:

5/538700

Inventors:

Russell R. Yost - Phoenix AZ
Eric J. Carlson - Mesa AZ

Assignee:

Motorola, Inc. - Chicago IL

International Classification:

G01S 958

US Classification:

343 68R

Abstract:

A radar reply transponder for use with existing radar tracking systems wherein a reply pulse is generated and trasmitted in response to an associated interrogation pulse. The reply pulse is delayed in time and offset in frequency by a precise amount with respect to the interrogation pulse, but it is nevertheless phase coherent therewith so as to preserve the required Doppler frequency information and thereby permit accurate velocity measurements. Phase coherence is effectively maintained by utilizing a single continuously operating local oscillator for down-converting the received interrogation pulse to an intermediate frequency as well as up-converting the signal information to provide the delayed and frequency offset reply pulse. The precision frequency offset is obtained by switching in an additional reactance element in the oscillator-determining circuitry during the time up-converting is being effected. The radar transponder may thus be used in a high-vibration environment with no substantial introduction of error in velocity measurements caused by using two independent oscillators to formulate the frequency offset.

US Patent:

40706753, Jan 24, 1978

Filed:

Oct 21, 1976

Appl. No.:

5/734699

Inventors:

Sam M. Daniel - Tempe AZ
Eric Jerome Carlson - Mesa AZ

Assignee:

Motorola Inc. - Schaumberg IL

International Classification:

H04B 700

US Classification:

343100LE

Abstract:

The present invention involves the use of an adaptive power injection apparatus with an existing antenna having a radiation pattern characterized by a relatively narrow main beam and a plurality of low level sidelobes for the purpose of enhancing the performance of the main antenna in a jamming evironment. The said apparatus consists of an adaptive subarray constrained to maintain a null in the direction of the main beam of the existing antenna. More specifically, the said adaptive array is composed of several individual antennae having relatively wide-beam patterns and combined with the existing antenna through individual IF stages all identical to the IF stage of the existing antenna, individual phase shifters which provide phases necessary for maximum reception from the direction of the main beam of the existing antenna and individual adjustable weights. The weights, which may consist of voltage controlled amplifiers or equivalent devices are adjusted by means of individual signals derived from correlating each corresponding auxilliary antenna signal with the combined signal at the output of the summing network and subsequently subtracting each such signal from the overall average. Setting the weights originally to have a zero average value creates a null in the direction of the main beam.

US Patent:

48334790, May 23, 1989

Filed:

Mar 21, 1988

Appl. No.:

7/171078

Inventors:

Eric J. Carlson - Mesa AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G01S 1328

US Classification:

342194

Abstract:

A digital poly phase pulse compressor that utilizes delay lines to separate KN samples of a received compressed pulse in I and Q channels, multiplies N of the KN samples with quadrature, weighted code phase signals by shifting and adding, cross couples the products of the shifting and adding in the I and Q channels to remove all code phase terms from the N samples in each channel, and combines the final n signals to provide I and Q compressed pulse components. The I and Q channels can be expanded into pluralities of channels to include compensation for Doppler shift.