Sampling threshold and gain for satellite navigation receiver

G - Physics – 01 – S

Patent

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G01S 1/04 (2006.01)

Patent

CA 2625224

A satellite navigation device (110) including a flexible radio frequency (RF) receiver (200) is described. The receiver (200) receives a signal (114) that includes at least a first spread- spectrum signal (210) from a first satellite. The receiver (200) has a first channel that includes an analog-to- digital (AfD) converter (338) to sample and quantize the signal and an automatic gain control (AGC) (330) to adjust an amplification of the signal (114). The A/D converter (338) has a first non-zero quantization threshold magnitude and a second non-zero quantization threshold magnitude. The AGC (330) may adjust a gain in accordance with the first non-zero quantization threshold magnitude. The gain may correspond to a first pre-determined probability of a non-zero sample and the second non-zero quantization threshold magnitude may correspond to a second pre-determined probability of a non-zero sample.

L'invention concerne un dispositif de navigation par satellite (110) comprenant un récepteur radio (RF) souple (200). Le récepteur (200) reçoit un signal (114) qui comprend au moins un premier signal à spectre étalé (210) en provenance d'un premier satellite. Le récepteur (200) présente un premier canal qui comprend un convertisseur analogique-numérique (A/N) (338) destiné à échantillonner et à quantifier le signal et une unité de commande de gain automatique (CAG) (330) destinée à régler une amplification du signal (114). Le convertisseur A/N (338) présente une première amplitude seuil de quantification non égale à zéro et une seconde amplitude seuil de quantification non égale à zéro. La CAG (330) peut régler un gain en fonction de la première amplitude seuil de quantification non égale à zéro. Le gain peut correspondre à une première probabilité prédéterminée d'un échantillon non égal à zéro et la seconde amplitude seuil de quantification non égale à zéro peut correspondre à une seconde probabilité prédéterminée d'un échantillon non égal à zéro.

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