Patent SG-11201907513V-A (SG)
Title: Receiver integrity monitoring using doppler analysis
Inventor: DERBEZ ERIC
IPC: G01S19/25
Filed: 2018-02-19
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 23 August 2018 (23.08.2018) WIP0 I PCT 0111111010 0111 °nolo OH Kit Ill mono oimIE (10) International Publication Number WO 2018/152465 Al (51) International Patent Classification: G01S 19/20 (2010.01) G01S 19/25 (2010.01) (21) International Application Number: PCT/US2018/018620 (22) International Filing Date: 19 February 2018 (19.02.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/461,075 20 February 2017 (20.02.2017) US (71) Applicant: IPOSI, INC. [US/US]; 1127 Auraria Parkway, Denver, Colorado 80204 (US). (72) Inventors: DERBEZ, Eric; 1276 West 7th Avenue, Vancouver, british Columbia V6H 1B6 (CA). KURBY, Christopher Neil; 912 Tuscany Drive, Streamwood, Illi- nois 60107 (US). (74) Agent: DEPPE, Jon P.; Marsh Fischmann & Breyfogle LLP, 8055 E. Tufts Ave. Suite 450, Denver, Colorado 80237 (US). Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: with international search report (Art. 21(3)) before the expiration of the time limit for amending the claims and to be republished in the event of receipt of amendments (Rule 48.2(h)) W O 20 18/ 152465 Al (54) Title: RECEIVER INTEGRITY MONITORING USING DOPPLER ANALYSIS (57) : Wave based signals such as radio transmissions are susceptible to frequency alterations caused by the relative movement between a transmitter and a receiver. In a satellite context, the radio signals emitted by a satellite based transmitter may take on a frequency higher or lower than the actual frequency at which they are generated depending on whether the satellite is moving toward or away from the receiver, respectively. By calculating the theoretical frequency shift (Doppler shift) that should occur if a signal travels directly from a satellite to a receiver, the actual frequency of the signal as received can be used to determine if the signal's integrity 302 is sufficient or if it has been compromised by some sort of interference or malfunction. Receive the radio signal at receiver 303 Determine actual Doppler value based on frequency at which rad. signal Is received 11 304 Calculate a Doppler error value based on the expected Doppler value and the actual Doppler value 305 Compare Doppler error value to predetermined threshold value FIG. 3 301 Calculate expected Doppler value of a radio signal using assumed positions of transmitter and receiver