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| Number | Title | Issue Date |
| 6973150 | Cycle slip detection using low pass filtering A cycle slip detector and detection method for a phase comparison circuit are provided. The cycle slip detector includes a cycle slip detection filter possessing a predetermined filter bandwidth and a predetermined high frequency cut-off. The cycle slip detection fi... | 12/06/2005 |
| 6928265 | METHOD OF AND APPARATUS FOR IMPLEMENTING HIGH SPEED DATA COMMUNICATION BY PHASE (FREQUENCY) MODULATION OF LORAN-C NAVIGATION SYSTEM USING SOLID-STATE PULSE TRANSMITTERS AND HIGH-POWER SOLID STATE SWITCHING FOR DYNAMIC ANTENNA TUNING A frequency-hopping intrapulse frequency modulation Loran-C navigation pulse technique, preferably using a flat-topped pulse shape and a novel 16-ary phase hopping scheme, and a novel improved high-power solid-state switch for dynamic antenna modulation tuning. ... | 08/09/2005 |
| 4821038 | Method of and apparatus for Loran-C message communication with reduced skywave navigation location errors and the like A Loran-C communications technique and system are disclosed involving appropriate encoding of communication messages and logical multiplication and inversion of encoded signals prior to phase modulation of the Loran-C pulses, with novel bit-flip connectio... | 04/11/1989 |
| 4814771 | Apparatus and method for receiving and proessing Loran signals A radio signal containing Loran C pulses from stations of interest is received and periodically sampled to convert the input signal to sample data. The data is assigned to memory locations within an acquisition memory at positions in the memory which corr... | 03/21/1989 |
| 4812852 | Locating system and method The present invention includes both a system and a method for locating a source of a randomly modulated radio signal. In one form of the invention, at least three receiving stations at known locations receive and process the randomly modulated radio signa... | 03/14/1989 |
| 4804964 | Loran-C signal receiving apparatus A Loran-C signal receiving apparatus which achieves accurate measurement of the location of the apparatus without error due to a well-known cycle slip phenomenon. In the Loran-C signal receiving apparatus, a pulse tracking a particular cycle of a carrier ... | 02/14/1989 |
| 4800391 | Method of and apparatus for message communication on Loran-C navigational signal broadcasts and the like with reduced navigation errors In a Loran-C message communication system a method of obviating errors in navigation locking caused by sampling reception at the conventional symmetrical pulse modulation time intervals in advance of and in delay from the normal transmission interval, thr... | 01/24/1989 |
| 4789864 | Low elevation guidance system A guidance system for aircraft wherein a radio antenna on the ground transmits a beam that sweeps across an aircraft and the aircraft receives the beam and utilizes its amplitude waveform in determining the location of the aircraft from the station. At lo... | 12/06/1988 |
| 4743912 | Method of and apparatus for reducing cycle slippage errors in Loran-C and similar radio-frequency signal reception, particularly in vehicles undergoing acceleration Method and apparatus of obviating cycle-locking slippage errors in reception of Loran-C and similar radio-frequency signals covered by receiver location acceleration effects and other distortion effects simulating the same, that comprises, receiving the r... | 05/10/1988 |
| 4631543 | Method and apparatus for reducing the effects of impulse noise in Loran-C receivers The effects of impulse noise on the operation of a microprocessor-controlled Loran-C receiver are reduced by muting or attenuating the received signals in the front end of the receiver ahead of the receiver gain during a time period which preceeds the sta... | 12/23/1986 |
| 4595927 | Loran C cycle slip reduction technique In accordance with the present invention, there is provided a Loran C cycle slip reduction technique that consists of sensing the signal to noise ratio and narrowing the phase locked loop bandwidth when a predetermined signal-to-noise threshold is exceede... | 06/17/1986 |
| 4591860 | Loran-C receiver In a loran-C radio receiver, tracking of the loran-C signal is initiated by sampling the carrier wave intensity of the loran-C signal at a high frequency over two pulse modulation cycles of the loran-C signal and storing the values recorded in each cycle ... | 05/27/1986 |
| 4482896 | Differential ECD detector for Loran C receiver Apparatus for processing received Loran C signals and compensating for envelope cycle discrepancy (ECD). A measure of ECD is determined during the fine settle operation and compared to a reference value which is an average over a period of time. If the di... | 11/13/1984 |
| 4224623 | Loran-C cycle detector A Loran-C receiver cycle detector is disclosed which processes Loran-C signal pulses on a cycle-by-cycle basis of the carrier frequency and generates an output for a specific carrier cycle. Due to received noise, sampling techniques are used to create a h... | 09/23/1980 |
| 4161696 | Pulse transmitter reference networks supplying ECD capability A method for varying the relationship of the RF cycles, produced by a reference network, inside a pulse envelope with respect to the start of the pulse envelope. The reference network, properly synthesized, is driven by a doublet impulse wherein the halve... | 07/17/1979 |
| 3934254 | Reliable cycle selection in LORAN-C system Reliable cycle selection is achieved with LORAN-C pulses received under low signal-to-noise conditions. A tracking pulse is generated at the LORAN-C pulse repetition rate and is intended to be time-coincident with the end of the third 100 KHz carrier cycl... | 01/20/1976 |
