# US 5,710,789 A · Signal synchronization system for encoded signals

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- Number: US 5,710,789 A
- Document ID: US5710789A
- Status: Granted
- Kind: A
- Application number: 08/681,260
- Filed: 1996-07-22
- Granted: 1998-01-20
- Earliest claimed: 1996-07-22
- Inventors: Timothy E. Snodgrass; Scott J. F. Zogg
- Web page: https://patentgrep.com/patent/US5710789A

## CPC

- H04B 1/7136: Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
- H04B 1/709: Correlator structure
- H04B 1/7156: Arrangements for sequence synchronisation
- H04L 1/06: using space diversity
- H04B 2001/71362: {using a bank of frequency sources}
- H04B 2001/71563: {Acquisition}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A system for receiving, correlating and interpreting secured wireless transmissions, periodic or otherwise, including multiplexed receivers, robust correlator design, a state machine device for controlling the receivers and correlation function, and the ability to determine signal spatial diversity via switched antenna signal processing. The correlator is constructed to include a synchronization scheme adaptive to any variety of input signals from the coupled receiver tuned frequencies.

## Claims

### Claim 1

A system for receiving and processing transmitted signals, comprising:
an antenna;
a plurality of receivers coupled to the antenna and tunable to the frequencies upon which the signal is transmitted;
a correlator for obtaining synchronization between the receivers and the transmitted signals;
a first switch disposed between the receivers and the correlator thereby coupling each receiver to the correlator;
a state device coupled to the correlator and the receivers that provides an enabling signal to the receiver and a corresponding decode mask to the correlator for synchronizing the transmitted signal; and
a code generator coupled to the state device providing a predetermined code sequence for use in obtaining system synchronization.

### Claim 2 (depends on 1)

The system of claim 1, wherein the correlator provides synchronization for non-periodic signals.

### Claim 3 (depends on 1)

The system of claim 1, wherein two receivers are utilized.

### Claim 4 (depends on 1)

The system of claim 1, wherein the correlator is provided with synchronization mask that is asymmetrical with respect to a signal format for each given frequency.

### Claim 5 (depends on 1)

The system of claim 1, wherein the correlator provides synchronization for continuous wave signals.

### Claim 6 (depends on 5)

The system of claim 5, wherein the correlator expends an unequal time period for each frequency signal correlated.

### Claim 7

A system for receiving and processing frequency-hopped transmitted signals, comprising:
an antenna array having switchable elements physically mounted in alternate locations;
a plurality of receivers coupled to the antenna array and tunable to the frequencies that the signal is transmitted;
a correlator for obtaining synchronization between the receivers and the transmitted signals;
a first switch disposed between the receivers and the correlator thereby coupling each receiver to the correlator;
additional processing means coupled to the correlator output signal;
a second switch disposed between and coupled to each of the receivers and antenna elements;
a state device coupled to the correlator, the receivers, and the antenna elements that provides an enabling signal to one or more of the antenna elements, the receivers and a corresponding decode mask to the correlator for synchronizing the transmitted signal; and a code generator coupled to the state device providing a predetermined code sequence for use in acquiring system synchronization.

### Claim 8 (depends on 7)

The system of claim 7, wherein the correlator provides synchronization for non-periodic signals.

### Claim 9 (depends on 7)

The system of claim 7, wherein two receivers are utilized.

### Claim 10 (depends on 7)

The system of claim 7, wherein the correlator is loaded with a synchronization mask that is asymmetrical with respect to a signal format for each signal frequency.

### Claim 11 (depends on 7)

The system of claim 7, wherein the correlator provides synchronization for continuous wave signals.

### Claim 12 (depends on 11)

The system of claim 11, wherein the correlator expends an unequal time period for each frequency signal correlated.

### Claim 13 (depends on 7)

The system of claim 7, wherein the angle of arrival of the transmitted signal may be determined via the simultaneous enabling of each antenna element and corresponding evaluation of signal reception.