# US 7,411,537 B2 · Digitizer arrangement

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- Number: US 7,411,537 B2
- Document ID: US7411537B2
- Status: Granted
- Kind: B2
- Application number: 11/568,946
- Filed: 2004-12-30
- Published: 2007-10-18
- Granted: 2008-08-12
- Earliest claimed: 2004-05-28
- Assignees: Telefonaktiebolaget L M Ericsson (publ)
- Inventors: Jens Fredrik Hjelmstad; Per Atle Våland
- Web page: https://patentgrep.com/patent/US7411537B2

## CPC

- H01Q 1/005: {Damping of vibrations; Means for reducing wind-induced forces}
- G01S 3/023: {Monitoring or calibrating}
- G01S 3/043: {Receivers}
- G01S 3/48: the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
- G01S 5/0009: {Transmission of position information to remote stations (involving assistance data G01S5/0236)}
- G01S 5/04: Position of source determined by a plurality of spaced direction-finders
- G01S 7/003: {Transmission of data between radar, sonar or lidar systems and remote stations}
- H01Q 1/02: Arrangements for de-icing; Arrangements for drying-out {; Arrangements for cooling; Arrangements for preventing corrosion}
- H01Q 1/288: {Satellite antennas}
- H01Q 9/0457: {electromagnetically coupled to the feed line}
- H01Q 15/147: {provided with means for controlling or monitoring the shape of the reflecting surface (for scanning H01Q3/01; aerials or aerial systems providing multiple beamwidths H01Q25/002)}
- H01Q 21/005: {Slotted waveguides arrays}
- H01Q 21/0087: {Apparatus or processes specially adapted for manufacturing antenna arrays (manufacturing waveguides H01P11/00)}
- H04B 1/28: the receiver comprising at least one semiconductor device having three or more electrodes
- G01S 7/021: {Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals}
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H04B: TRANSMISSION

## Abstract

A digitizer arrangement for converting an analogue signal into a digital signal, including a first A/D converter, said first A/D converter being arranged to convert said analogue signal into a first digital signal with a first sampling rate, the first sampling rate being lower than the frequency of the analogue signal, a second A/D converter, said second A/D converter being arranged to convert said high frequency analogue signal into a second digital signal with a second sampling rate, the second sampling rate being lower than the frequency of the analogue signal, means for combining said first and second digital signals into a third digital signal with a third sampling rate that is at least a multiple of said first and second sampling rates.

## Claims

### Claim 1

A digitizer arrangement for converting an analogue signal into a digital signal, comprising:
a first AID converter, said first AID converter being arranged to convert said analogue signal into a first digital signal with a first sampling frequency, the first sampling frequency being lower than the frequency of the analogue signal;
a second A/D converter, said second A/D converter being arranged to convert said high frequency analogue signal into a second digital signal with a second sampling frequency, the second sampling frequency being lower than the frequency of the analogue signal, said first and second sampling frequencies being different and with a non-harmonic relationship; and
means for combining said first and second digital signals into a third digital signal with a third sampling frequency that is at least a multiple of said first and second sampling frequencies.

### Claim 2 (depends on 1)

A digitizer as claimed in claim 1, further comprising:
means for correlating the first and second digital signals, said means being arranged to mute signals with a correlation factor lower than 0.9 over integration time 1/f3, f3 being equal to the multiple of said first and second sampling frequencies.

### Claim 3 (depends on 2)

A digitizer as claimed in claim 2, further comprising:
means for identifying a corresponding signal pair in the first and second digital signals;
means for determining a first conversion factor based on the frequencies of said signal pair; and
means for transposing the frequency of said first digital signal to the third digital signal with said first conversion factor.

### Claim 4 (depends on 2)

A digitizer as claimed in claim 2, further comprising:
means for identifying a corresponding signal pair in the first and second digital signals;
means for determining a first conversion factor based on the frequencies of said signal pair;
means for transposing the frequency of said first digital signal to a fourth digital signal with said first conversion factor;
means for determining a second conversion factor based on the frequencies of said signal pair;
means for transposing the frequency of said second digital signal to a fifth digital signal with said second conversion factor; and,
means for adding the fourth digital signal to the fifth digital signal and obtaining said third digital signal.