Satellite-aided radio navigation positioning method and radio navigation system therefor

• US 5,331,329 A
• Filed: 09/29/1992
• Issued: 07/19/1994
• Est. Priority Date: 05/25/1988
• Status: Expired due to Fees

• Current Assignee: Nauchno-Issledovatelsky Institut Kosmicheskogo Priborostoenia
• Original Assignee: Nauchno-Issledovatelsky Institut Kosmicheskogo Priborostoenia
• Inventors: Shishkova, administrator, by Tatyana P., Tjubalin, Valery V., Glazov, Stanislav S., Ivanov, Nikolai E., Kovalenko, administrator, Nikita V., Volkov, Nikolai M., Kovalenko, deceased, Valery F., Kovalenko, administrator, Nadezhda V., Salischev, Vadim A., Alyabina, deceased, German M., Sergeev, Boris G., Kovalenko, administrator, Sergei V., Ljubimov, Mikhail A.
• Primary Examiner(s): Issing, Gregory C.
• Application Number:
  US07/930,556
• Time in Patent Office: 658 Days
• Field of Search: 342/352, 342/357, 342/457, 342/458, 342/461, 455/12.1, 455/17, 375/1
• US Class Current: 342/357.395
• CPC Class Codes: G01S 19/02 Details of the space or ground control segments

Abstract

A method for radio navigation positioning with the aid of satellites, in accordance to which a radio navigation signal is generated on board the satellites (1) by modulating the carrier frequency (f_c) with an assemblage of signals including a pseudorandom sequence, the navigation data, and a synchronization code, and the object-users (2) determine their positioning, speed of mation and a correction factor to the time scale during reception and processing of the radio navigation signal. According to the invention, each satellite or pair of mutual opposite satellites on an orbital plane are ascribed individual carrier frequencies (f_cj, f_ck) and use a common to all satellites (1) pseudorandom M-sequence of truncated length, dibit coding of navigation data symbols and synchronization code of shortened repetition period and increased number of symbols. According to the invention, the radio navigation system completely implements this method on board each satellite (1) in the radio navigation signal generating and transmitting system and at each object-use (2) in the radio signal reception and processing subsystem. This improves the probability of navigation positioning at any instant of time with a high accuracy by practically completely eliminating the effects of intersystem interference and also substantially shortens the time of navigation positioning.

Claims

1. A method for radio navigation positioning with the aid of satellites on several orbital planes (A,B,C), each satellite (1) having an individual number and comprising:

a) generating a carrier frequency from a sinusoidal signal generated by a frequency and time standard, said carrier frequency being unique for each said satellite or for each pair of mutually opposite satellites in an orbital plane;

b) modulating said carrier by a set of signals including an M-sequence pseudorandom sequence common to all of the radio navigation signals generated by each of said satellites and dibit coded signals representing navigation data and a synchronization code;

c) receiving said signal by a receiver at an object-user, each said receiver generating a reference signal the heterodyne frequency thereof being selected according to the carrier frequency of the transmitting satellite desired to be received;

d) correlating reception of said navigation signal; and

e) measuring a pseudodistance and radial pseudospeed of said object-user relative to said satellite for calculating the positioning coordinates and speed of motion of said object-user and the correction factor for a time scale of said object user.

2. The method according to claim 1 wherein said M-sequence is 511 elements in length.

3. The method according to claim 1 wherein the synchronization code has a repetition period of 2 seconds and a number of symbols equal to 30.

4. The method according to claim 2 wherein the synchronization code has a repetition period of 2 seconds and a number of symbols equal to 30.

5. Apparatus for radio navigation positioning with the aid of satellites on several orbital planes (A,B,C), each satellite (1) having an individual number and comprising:

a) means for generating a carrier frequency from a sinusoidal signal generated by a frequency and time standard, said carrier frequency being unique for each said satellite or for each pair of mutually opposite satellites in an orbital plane;

b) means for modulating said carrier by a set of signals including an M-sequence pseudorandom sequence common to all of the radio navigation signals generated by each of said satellites and dibit coded signals representing navigation data and a synchronization code;

c) means for receiving said signal by a receiver at an object-user, each said receiver generating a reference signal the heterodyne frequency thereof being selected according to the carrier frequency of the transmitting satellite desired to be received;

d) means for correlating reception of said navigation signal; and

e) means for measuring a pseudodistance and radial pseudospeed of said object-user relative to said satellite for calculating the positioning coordinates and speed of motion of said object-user and the correction factor for a time scale of said object user.

6. The apparatus according to claim 5 wherein said M-sequence is 511 elements in length.

7. The apparatus according to claim 5 wherein the synchronization code has a repetition period of 2 seconds and a number of symbols equal to 30.

8. The apparatus according to claim 6 wherein the synchronization code has a repetition period of 2 seconds and a number of symbols equal to 30.