Antenna LNA filter for GNSS device
AssigneeJavad GNSS, Inc.
InventorsJavad Ashjaee, Dmitry Dubrovsky
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Abstract
Low-noise amplifier (LNA) filters and processes for filtering global navigation satellite system (GNSS) signals are disclosed. The LNA filters can be used to down-convert a received GNSS signal to a lower frequency, filter the GNSS signal at the lower frequency, and up-convert the GNSS signal to the original frequency of the GNSS signal. The down-converted frequency can be selected based on a temperature of the GNSS signal to compensate for shifts in the frequency response of the filter due to temperature changes.
Claims15
A low-noise amplifier (LNA) filter comprising:
- a temperature sensor for detecting a temperature of the LNA filter;
- a first stage coupled to receive a GNSS signal from a first antenna, wherein the first stage is configured to at least partially filter portions of the GNSS signal outside of a first frequency band, and wherein the GNSS signal has a signal frequency equal to an original frequency value within the first frequency band;
- a second stage coupled to receive the GNSS signal from the first stage, wherein the second stage is configured to:
- down-convert the frequency of the GNSS signal to a first value lower than the original frequency value, wherein the first value is within a second frequency band and the first value is based at least in part on the temperature of the LNA filter detected by the temperature sensor;
- and
- at least partially filter portions of the down-converted GNSS signal outside of the second frequency band, wherein the second frequency band has a frequency range corresponding to a frequency range of the first frequency band after down-converting;
- and
- a third stage coupled to receive the down-converted GNSS signal from the second stage, wherein the third stage is configured to up-convert the frequency of the GNSS signal to the original frequency value.
A method for filtering a global navigation satellite system (GNSS) signal, the method comprising:
- detecting a temperature of a low-noise amplifier (LNA) filter by a temperature sensor;
- receiving, at a first stage of the LNA filter, a GNSS signal from a first antenna having a signal frequency equal to an original frequency value within a first frequency band;
- down-converting, by a second stage of the LNA filter, the frequency of the GNSS signal to a value lower than the original frequency value, wherein the value is within a second frequency band and the value is based at least in part on the temperature of the LNA filter detected by the temperature sensor;
- at least partially filtering, by the second stage of the LNA filter, the down-converted GNSS signal outside of the second frequency band, wherein the second frequency band has a frequency range corresponding to a frequency range of the first frequency band after down-converting;
- and
- up-converting, by a third stage of the LNA filter, the frequency of the GNSS signal to the original frequency value.
Dependencies are inferred from the claim text.