Downlink synchronization channel for the narrow-band cellular iot
US-2016262123-A1 · Sep 8, 2016 · US
Slow hopping anti-jam waveform (SHAW)
US10469125B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10469125-B2 |
| Application number | US-201615176739-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 8, 2016 |
| Priority date | Jun 8, 2015 |
| Publication date | Nov 5, 2019 |
| Grant date | Nov 5, 2019 |
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- Title
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Abstract
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A method of transmitting a message using a slow hopping anti-jam waveform, includes generating a sequence with a cryptographic hash function; transmitting, for a predetermined dwell time, a first portion of the message on a first channel having a first baseline frequency; choosing a second channel having a second baseline frequency based on the generated sequence, the second baseline frequency being offset from the first baseline frequency; and transmitting, for the predetermined dwell time, a second portion of the message on the second channel having the second baseline frequency; wherein the two transmitting steps occur sequentially.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of transmitting a message using a slow hopping anti-jam waveform, the method comprising the steps of: generating a sequence with a cryptographic hash function; transmitting, for a predetermined dwell time, a first portion of the message on a first channel having a first baseline frequency; choosing a second channel having a second baseline frequency based on the generated sequence, the second baseline frequency being offset from the first baseline frequency; transmitting, for the predetermined dwell time, a second portion of the message on the second channel having the second baseline frequency; and transmitting a resynch pulse for cold rendezvous wherein the two transmitting, for a predetermined dwell time, steps occur sequentially, and wherein transmitting the resynch pulse includes a Chu sequence for precise timing, a senders time-stamp at which the Chu sequence was sent, a random number generated by a sync node for each packet, and a verification portion. 2. The method of claim 1 , wherein the predetermined dwell time is chosen to be longer than an amount of time for oscillator transients to suppress. 3. The method of claim 1 , wherein the verification portion includes a digital signature signing the time-stamp with a mission authentication key. 4. The method of claim 1 , wherein the verification portion includes an encrypted authentication function. 5. The method of claim 1 , wherein the predetermined dwell time is approximately 0.1 seconds. 6. The method of claim 1 , wherein the steps of transmitting, for a predetermined dwell time, include modulating the transmission via direct-sequence spread spectrum modulation.
Assignees
Inventors
Classifications
Zadoff-Chu · CPC title
Active attacks involving interception, injection, modification, spoofing of data unit addresses, e.g. hijacking, packet injection or TCP sequence number attacks · CPC title
using cryptographic hash functions · CPC title
the interference being multiple access interference · CPC title
Detection or prevention of fraud · CPC title
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- What does patent US10469125B2 cover?
- A method of transmitting a message using a slow hopping anti-jam waveform, includes generating a sequence with a cryptographic hash function; transmitting, for a predetermined dwell time, a first portion of the message on a first channel having a first baseline frequency; choosing a second channel having a second baseline frequency based on the generated sequence, the second baseline frequency …
- Who is the assignee on this patent?
- Us Gov Sec Navy
- What technology area does this patent fall under?
- Primary CPC classification H04B1/692. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Nov 05 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).