Abstract: The disclosed global navigation satellite system (GNSS) devices and methods group GNSS satellite signals from different GNSS constellations, as well as other signals of interest, into sub-bands, also called ‘superbands’, by signal frequency for analog filtering and processing, and then further divides each superband for additional processing in the digital domain. Each superband is a frequency range that can include GNSS satellite signals from one, two, three, or more than three, GNSS constellations. Using multiple parallel processing channels allows multiple signal frequency bands that cover a wide bandwidth to be divided into narrower superbands for processing, which increases the processing abilities within the superbands and allows out-of-band interference between superbands to be eliminated. Thus the GNSS satellite signals are divided for processing according to frequency, not according to the originating GNSS satellite constellation.

Abstract: An RF (e.g., GNSS) interference mitigation system and method uses a switchable bank of filters for selectively blocking signals in predetermined bandwidths based on detecting strong, interfering signals with an interference detection circuit including a sniffer antenna. A low-strength RF (e.g., GNSS) system can be combined with a spectrally-close high-strength, telecommunications receiver system for cooperative control. Alternatively, an RF receiver can detect tones, changes in DC bias or level changes to activate a filter selection switch.

Abstract: Global Navigation Satellite System (GNSS) signals are first received and then down converted to an intermediate frequency (IF) and digitally sampled. The sampled signals are multiplied by a local replica of the incoming IF carrier (I ref generator and Q ref generator). The purpose is to remove the Doppler and move the results to baseband for later accumulation processing. Two parallel correlation kernel modules, one kernel assuming the navigation data D is 1 while the other assuming navigation data D=0 or (?1), are provided. The correlation kernel takes the code numerically-controlled oscillator (nco) phase of the prompt signal as input, and generates four output signals that are multiplied by the Doppler-removed incoming sample signal. An implementation of the pulsed signals accommodates navigation data D=1 and D=0 or (?1).

Abstract: A multi-frequency down converter includes first and second signal paths. A common local oscillator/synthesizer drives both of the signal paths. Exemplary applications include GNSS systems operating across superbands. The down converter is adapted for use in a GNSS receiver system.

Abstract: An RF (e.g., GNSS) interference mitigation system and method uses a switchable bank of filters for selectively blocking signals in predetermined bandwidths based on detecting strong, interfering signals with an interference detection circuit including a sniffer antenna. A low-strength RF (e.g., GNSS) system can be combined with a spectrally-close high-strength, telecommunications receiver system for cooperative control. Alternatively, an RF receiver can detect tones, changes in DC bias or level changes to activate a filter selection switch.

Abstract: A GNSS system includes a receiver connected to an external mass storage device. Applications for the system, including GNSS data processing methods are also disclosed. The external storage device can comprise a flash (thumb) drive, which can be connected to the receiver via a USB interconnection.

Abstract: A multi-frequency down converter includes first and second signal paths. A common local oscillator/synthesizer drives both of the signal paths. Exemplary applications include GNSS systems operating across superbands. The down converter is adapted for use in a GNSS receiver system.

Abstract: A GNSS system includes a receiver connected to an external mass storage device. Applications for the system, including GNSS data processing methods are also disclosed. The external storage device can comprise a flash (thumb) drive, which can be connected to the receiver via a USB interconnection.

Abstract: A GNSS system includes a receiver connected to an external mass storage device. Applications for the system, including GNSS data processing methods are also disclosed. The external storage device can comprise a flash (thumb) drive, which can be connected to the receiver via a USB interconnection.

Abstract: A multi-frequency down converter includes first and second signal paths. A common local oscillator/synthesizer drives both of the signal paths. Exemplary applications include GNSS systems operating across superbands. The down converter is adapted for use in a GNSS receiver system.

Abstract: A GNSS system includes a receiver connected to an external mass storage device. Applications for the system, including GNSS data processing methods are also disclosed. The external storage device can comprise a flash (thumb) drive, which can be connected to the receiver via a USB interconnection.

Abstract: A method and system of synchronizing multiple tracking devices in a geo-location receiver system comprising: receiving a first plurality of geo-location signals with a first tracking device; and receiving a second plurality of geo-location signals with a second tracking device. The method also includes: enabling the first tracking device as either a master tracking device or a master-with-mark tracking device; enabling the second tracking device to operate as a slave tracking device; the master tracking device generates and transmits a timing signal to the slave tracking device; and the master-with-mark tracking device is configured to receive an external input for synchronization and generates and transmits a timing signal to the slave tracking device. The method also includes acquiring the first plurality of geo-location signals and the second plurality of geo-location signals at a substantially simultaneous instant of time.

Abstract: A constrained-envelope digital-communications transmitter circuit (22) includes a binary data source (32) that provides an input signal stream (34) to a modulator (77,77′). The modulator (77,77′) includes a pulse-spreading filter (76) that filters a phase-point signal stream (50) or a composite signal stream (168) into a modulated signal (74). A constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the modulated signal (74), and a delay element (138) delays the modulated signal (74) into a delayed modulated signal (140) synchronized with the constrained-bandwidth error signal stream (108). A complex summing circuit (110) sums the delayed modulated signal (140) and the constrained-bandwidth error signal stream (108) into an altered modulated signal (112), and a substantially linear amplifier (146) amplifies the altered modulated signal (112) and transmits it as a radio-frequency broadcast signal (26).

Abstract: A constrained-envelope digital-communications transmitter circuit (22) in which a binary data source (32) provides an input signal stream (34), a phase mapper (44) maps the input signal stream (34) into a quadrature phase-point signal stream (50) having a predetermined number of symbols per unit baud interval (64) and defining a phase point (54) in a phase-point constellation (46), a pulse-spreading filter (76) filters the phase-point signal stream (50) into a filtered signal stream (74), a constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the filtered signal stream (74), a delay element (138) delays the filtered signal stream (74) into a delayed signal stream (140) synchronized with the constrained-bandwidth error signal stream (108), a complex summing circuit (110) sums the delayed signal stream (140) and the constrained-bandwidth error signal stream (108) into a constrained-envelope signal stream (112), and a substantially linear amplifier (146) amplifies

Abstract: An interference-tolerant spread-spectrum receiver (20) includes an FIR (finite impulse response) filter network (32) and a correlator/detector (34). The filter network (32) contains a pair of FIR filters (36) substantially identical to each other. A signal passes directly into the first filter (36'), but is delayed a predetermined amount of time before passing into the second filter (36"). Each of the filters (36) contains means for sampling (62) and windowing (70) the signal in the time domain; transforming (118) the signal to the frequency domain; limiting (130) and despreading (160) the signal in the frequency domain; and transforming (168) the signal back to the time domain. The signal from the first filter (36') is delayed the predetermined amount of time to resynchronize signals from both filters (36), which signals are then combined into a single signal. The combined signal is then passed into the correlator/detector (34), which determines the presence or absence of a spread-spectrum signal.

Abstract: A constrained-envelope digital-communications transmitter circuit (22) in which a binary data source (32) provides an input signal stream (34), a phase mapper (44) maps the input signal stream (34) into a quadrature phase-point signal stream (50) having a predetermined number of symbols per unit baud interval (64) and defining a phase point (54) in a phase-point constellation (46), a pulse-spreading filter (76) filters the phase-point signal stream (50) into a filtered signal stream (74), a constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the filtered signal stream (74), a delay element (138) delays the filtered signal stream (74) into a delayed signal stream (140) synchronized with the constrained-bandwidth error signal stream (108), a complex summing circuit (110) sums the delayed signal stream (140) and the constrained-bandwidth error signal stream (108) into a constrained-envelope signal stream (112), and a substantially linear amplifier (146) amplifies

Abstract: A constrained-envelope digital-communications transmitter circuit (22) in which a binary data source (32) provides an input signal stream (34), a phase mapper (44) maps the input signal stream (34) into a quadrature phase-point signal stream (50) having a predetermined number of symbols per unit baud interval (64) and defining a phase point (54) in a phase-point constellation (46), a pulse-spreading filter (76) filters the phase-point signal stream (50) into a filtered signal stream (74), a constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the filtered signal stream (74), a delay element (138) delays the filtered signal stream (74) into a delayed signal stream (140) synchronized with the constrained-bandwidth error signal stream (108), a complex summing circuit (110) sums the delayed signal stream (140) and the constrained-bandwidth error signal stream (108) into a constrained-envelope signal stream (112), and a substantially linear amplifier (146) amplifies